CN105013275A - Purification method for boiler flue gas - Google Patents
Purification method for boiler flue gas Download PDFInfo
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- CN105013275A CN105013275A CN201510263605.4A CN201510263605A CN105013275A CN 105013275 A CN105013275 A CN 105013275A CN 201510263605 A CN201510263605 A CN 201510263605A CN 105013275 A CN105013275 A CN 105013275A
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Abstract
The present invention discloses a purification method for boiler flue gas, comprising the steps of: electrostatic precipitation, desulfurization, and evaporation and drying. In the electrostatic precipitation step, the flue gas in a boiler flue is introduced into a electrostatic precipitator so as to remove a great mass of dust in the flue gas. In the desulfurization step, the flue gas, after the electrostatic precipitation step, is mixed with an alkaline liquid spray in a vertical shaft electric field; the fine ash particles and sulfur dioxide of the flue gas, influenced by an electric field force, and grouped, captured and coagulated by the alkali liquid spray, concentrate into small clumps that adhere to electrodes of the vertical shaft electric field. In the evaporation and drying step, the residual ash particles, after the desulfurization step, are washed, by current formed by an atomizer, into an evaporating drier, ash water is evaporated to dry by using the evaporation drier and the waste heat of the flue gas so as to obtain the clean flue gas. The method of the present invention is not only capable of mixing the fine ash particles in the flue gas with atomized lye sufficiently, thereby removing sulfur dioxide in the flue gas, but also can effectively prevent the secondary water pollution caused by ash and water mixture and has a good purification effect on the flue gas.
Description
Technical field
The present invention relates to boiler smoke udst separation technical field, particularly relate to a kind of can thorough purification boiler flue gas and do not produce the method for secondary pollution.
Background technology
In recent years, atmosphere pollution is more serious, the coal-burning boiler used in thermal power plant, Industrial Boiler, heating boiler, the iron and steel enterprise kiln that uses coal to be fuel all can to a large amount of flue gas of airborne release, a large amount of sulfur dioxide, oxynitrides and dust is had in flue gas, these noxious materials also with flue gas discharged to air, this is the primary pollution source of atmosphere pollution, although conventional Electric Scrubber Efficiency reaches 99%, still very low for its efficiency of dust collection of too thin dust; Sack cleaner has higher efficiency for tiny dust, but resistance is but very large, consume a large amount of electric energy, incompatible with the excellent situation of current energy-saving and emission-reduction, applying unit is very few, this just makes the trickle grey particle in air exceed standard in a large number, and the generation for haze provides sufficient material base.
Based on all considerations of above factor, in the urgent need to finding a kind of purifying method for boiler fume, effectively can remove trickle grey particle, sulfur dioxide, the oxynitrides in flue gas can be absorbed again in a large number, thus reduce haze incidence, improve air quality.
Publication number is CN 102476025A, publication date is that the Chinese patent literature of on 05 30th, 2012 discloses a kind of boiler smoke dust-collecting sulfur-removing method, it is characterized in that, described sulfur method, 1), E field electrostatic dedusting comprise the step such as electrostatic precipitation and swirl-spray desulfurization, concrete steps are as follows:: recovery boiler flue gas adopts E field electrostatic dust collection method to carry out electrostatic precipitation to it; 2), desulfurization: adopt Dual alkali technique, first step NaOH solution is the sulfur dioxide in the first Alkali absorption flue gas, then is the second alkali with calcium carbonate carbide slag liquid, and the NaOH in regenerable absorbent first step liquid, obtains desuifurized; 3) the NaOH absorbing liquid, after regeneration is sent desulfurizing tower back to and is recycled.
Boiler smoke dust-collecting sulfur-removing method disclosed in this patent document, oarse-grained dust in flue gas can only be adsorbed by E field electrostatic dedusting, its efficiency of dust collection of too thin dust is poor, and the desuifurized liquid obtained after sodium hydroxide solution and the process of calcium carbonate carbide slag liquid easily causes secondarily polluted water, has a strong impact on environmental quality.
Summary of the invention
The present invention is in order to overcome the defect of above-mentioned prior art, a kind of purifying method for boiler fume is provided, the present invention can make the trickle grey particle in flue gas fully mix with the alkali lye after atomization, slough the sulfur dioxide in flue gas, can effectively prevent ash again, secondarily polluted water that aqueous mixtures causes, there is good gas cleaning effect.
The present invention is achieved through the following technical solutions:
A kind of purifying method for boiler fume, comprise electrostatic precipitation step and desulfurized step, it is characterized in that: also comprise evaporation baking step, described electrostatic precipitation step refers to introduces electrostatic precipitator by the flue gas in boiler flue, the most of dust in electrostatic precipitator removing flue gas; Described desulfurized step refers to that the flue gas after electrostatic precipitation step is sprayed with the alkali lye in vertical shaft electric field and mixes, grey particle trickle in flue gas and sulfur dioxide electric field force, alkali lye spraying gathering, catch, be gathered into little group under coalescence effect and stick on the electrode of vertical shaft electric field; Described evaporation baking step refers to that soot particle residual after desulfurized step is rushed in evaporation drying box by the current that sprayer is formed, and buck evaporate to dryness is obtained final clean flue gas by the waste heat of evaporation drying box and flue gas jointly.
Also comprise flue gas and draw step, described flue gas is drawn step and is referred to that the flue gas after evaporation baking step is sent to chimney by induced draft blower withdraws and enters air.
Described vertical shaft electric field is made up of vertical shaft, conducting rod, the electrode being positioned at vertical shaft and the high-voltage electrostatic power be positioned at outside vertical shaft, and the positive pole of high-voltage electrostatic power is connected with the outer wall of vertical shaft by wire, and negative pole is by conducting rod and Electrode connection.
Described electrode is made up of corona discharge electrode and the prickle wire be distributed in around corona discharge electrode.
The voltage of described high-voltage electrostatic power is 20-60 kilovolt continuously adjustabe.
Described alkali lye spraying refers to and adopts sprayer that the alkali lye ejection in alkali liquid tank is formed vaporific alkali lye.
The pressure of described sprayer is 2.2-2.8 MPa, and the fountain height of alkali lye is 100-300 kg/hr.
The motor that described sprayer is rotated by the rotating disc be enclosed within sparge pipe, driving rotating disc is formed with the shower nozzle be connected on the rotating pan, and shower nozzle is connected with sparge pipe.
Be provided with the insulating frame for fixing conducting rod above described sprayer, insulating frame is fixedly connected on the inwall of vertical shaft.
The top of described insulating frame is provided with porous homogenizing plate, and porous homogenizing plate is slidably connected on the inwall of vertical shaft.
Described shower nozzle is made up of sprinkler body and the many venturi jet pipes be embedded on sprinkler body, and many venturi jet pipes are evenly arranged on sprinkler body.
The bottom of described alkali liquid tank is connected with three-way pipe, three-way pipe is connected with three sparge pipes, three sparge pipes is all connected with a sprayer, and three sprayers are triangularly arranged in vertical shaft.
Described evaporation drying box by casing, be fixed on the heater in casing and the supporting plate be slidably connected on cabinet wall is formed, the sidewall of casing is run through in one end of supporting plate.
Temperature in described evaporation drying box is 130-150 degree Celsius.
Beneficial effect of the present invention is mainly manifested in the following aspects:
One, in the present invention, flue gas after electrostatic precipitation step is sprayed with the alkali lye in vertical shaft electric field and mixes, grey particle trickle in flue gas and sulfur dioxide just can in the gathering of electric field force, alkali lye spraying, catch, be gathered into little group under coalescence effect and stick on the electrode of vertical shaft electric field; By evaporation baking step, the little group be gathered on electrode can be made to rush in evaporation drying box in the lump together with the current that alkali lye is formed, the waste heat of evaporation drying box and flue gas is jointly by buck evaporate to dryness, purify the clean flue gas obtained to discharge through evaporation drying box simultaneously, adopt vertical shaft electric field and the method coordinating alkali lye to spray, the trickle grey particle in flue gas can be made fully to mix with the alkali lye after atomization, slough the sulfur dioxide in flue gas; Ash after evaporation baking step, aqueous mixtures can be discharged again in time, effectively can prevent secondarily polluted water; Whole technical scheme reaches good gas cleaning effect.
Two, in the present invention, adopt flue gas to draw step, fast evaporation drying box clean flue gas out can be pumped out by air-introduced machine, and be sent to chimney and enter air, effectively prevent flue gas from returning and alter.
Three, in the present invention, vertical shaft electric field is made up of vertical shaft, conducting rod, the electrode being positioned at vertical shaft and the high-voltage electrostatic power be positioned at outside vertical shaft, the positive pole of high-voltage electrostatic power is connected with the outer wall of vertical shaft by wire, negative pole is by conducting rod and Electrode connection, adopt the vertical shaft electric field of this ad hoc structure, comparatively uniform electric field can be formed in vertical shaft, thus the trickle grey particle in flue gas is accumulated on electrode in a large number, be convenient to improve postorder dust removing effects.
Four, in the present invention, electrode is made up of corona discharge electrode and the prickle wire be distributed in around corona discharge electrode, prickle wire electric discharge forms electric field, because Charged is contrary with the polarity of corona discharge electrode, in corona zone with near corona zone, Charged just can be deposited on corona discharge electrode by a very near part, thus reaches good dedusting object.
Five, in the present invention, the voltage of high-voltage electrostatic power is 20-60 kilovolt continuously adjustabe, can according to smoke property and handled Dust Characteristics, the output voltage of the dedusting of adjustment supply in time, make dedusting obtain corona discharge power high as far as possible, reach good dust removing effects.
Six, in the present invention, alkali lye spraying refers to and adopts sprayer that the alkali lye ejection in alkali liquid tank is formed vaporific alkali lye, and vaporific alkali lye can fully contact with the sulfur dioxide in flue gas, thus ensures the desulfurized effect of flue gas.
Seven, in the present invention, the pressure of sprayer is 2.2-2.8 MPa, the fountain height of alkali lye is 100-300 kg/hr, adopt specific atomisation pressure, can ensure that alkali lye is formed finely dispersed vaporific, adopt specific alkali lye fountain height, good desulfurized effect can be ensured, the excessive secondary pollution caused of alkali lye can be prevented again.
Eight, in the present invention, the motor that sprayer is rotated by the rotating disc be enclosed within sparge pipe, driving rotating disc is formed with the shower nozzle be connected on the rotating pan, shower nozzle is connected with sparge pipe, adopt the sprayer of this ad hoc structure, shower nozzle can rotate freely, the spraying that alkali lye is formed is attached on electrode more uniformly, thus farthest adsorbs the sulfur dioxide in flue gas, reaches good desulfurized effect.
Nine, in the present invention, be provided with the insulating frame for fixing conducting rod above sprayer, insulating frame is fixedly connected on the inwall of vertical shaft, and insulating frame can play good support, firmly act on conducting rod, prevents conducting rod from shaking.
Ten, in the present invention, the top of insulating frame is provided with porous homogenizing plate, porous homogenizing plate is slidably connected on the inwall of vertical shaft, guiding peptizaiton can be played to flue gas by porous homogenizing plate, prevent flue gas localized clusters, thus enable the more evenly comprehensive trickle grey particle adsorbed in flue gas of the electrode in vertical shaft electric field, improve flue gas ash removal effect further.
11, in the present invention, shower nozzle is made up of sprinkler body and the many venturi jet pipes be embedded on sprinkler body, many venturi jet pipes are evenly arranged on sprinkler body, adopt venturi jet pipe, alkali lye in sparge pipe forms an acceleration by venturi jet pipe, alkali lye after ejection is more easily formed vaporific, thus the sulfur dioxide of alkali lye fully and in flue gas is reacted, and improves flue gas desulfurization effect further.
12, in the present invention, the bottom of alkali liquid tank is connected with three-way pipe, three-way pipe is connected with three sparge pipes, three sparge pipes are all connected with a sprayer, three sprayers are triangularly arranged in vertical shaft, and each sprayer can both rotate freely, and spatially can form multi-angle spraying, the maximized sulfur dioxide in flue gas and the alkali lye of making reacts, and greatly improves flue gas desulfurization effect.
13, in the present invention, evaporation drying box by casing, be fixed on the heater in casing and the supporting plate be slidably connected on cabinet wall is formed, the sidewall of casing is run through in one end of supporting plate, heater coordinates the waste heat of flue gas, rapidly by ash, aqueous mixtures evaporate to dryness, and just can remove the dust after evaporate to dryness in time by pull-out supporting plate.
14, in the present invention, the temperature in evaporation drying box is 130-150 degree Celsius, adopts this specific temperature, coordinates flue gas own temperature that ash, aqueous mixtures just can be made rapidly by evaporate to dryness, need not too much auxiliary heating, effectively saves energy consumption.
Accompanying drawing explanation
Fig. 1 is the structural representation of flue purifier of boiler of the present invention;
Fig. 2 is the structural representation of flue purifier of boiler in the embodiment of the present invention 5;
Fig. 3 is the structural representation of sprayer in the embodiment of the present invention 5;
Fig. 4 is the structural representation of flue purifier of boiler in the embodiment of the present invention 6;
Fig. 5 is the structural representation of sprayer in the embodiment of the present invention 6;
Fig. 6 is the structural representation of flue purifier of boiler in the embodiment of the present invention 7;
Fig. 7 is the structural representation of evaporation drying box in the embodiment of the present invention 8;
Mark in figure: 1, electrostatic precipitator, 2, vertical shaft electric field, 3, electrode, 4, sprayer, 5, evaporation drying box, 6, vertical shaft, 7, conducting rod, 8, vertical shaft electrode, 9, high-voltage electrostatic power, 10, corona discharge electrode, 11, prickle wire, 12, alkali liquid tank, 13, sparge pipe, 14, rotating disc, 15, motor, 16, shower nozzle, 17, insulating frame, 18, porous homogenizing plate, 19, venturi jet pipe, 20, three-way pipe, 21, casing, 22, heater, 23, supporting plate.
Detailed description of the invention
Embodiment 1
See Fig. 1, a kind of purifying method for boiler fume, comprises electrostatic precipitation step and desulfurized step, also comprises evaporation baking step, described electrostatic precipitation step refers to introduces electrostatic precipitator 1 by the flue gas in boiler flue, and electrostatic precipitator 1 removes the most of dust in flue gas; Described desulfurized step refers to that the flue gas after electrostatic precipitation step is sprayed with the alkali lye in vertical shaft electric field 2 and mixes, grey particle trickle in flue gas and sulfur dioxide electric field force, alkali lye spraying gathering, catch, be gathered into little group under coalescence effect and stick on the electrode 3 of vertical shaft electric field 2; Described evaporation baking step refers to that soot particle residual after desulfurized step is rushed in evaporation drying box 5 by the current that sprayer 4 is formed, and buck evaporate to dryness is obtained final clean flue gas with the waste heat of flue gas by evaporation drying box 5 jointly.
The present embodiment is the most basic embodiment, adopt the vertical shaft electric field of prior art, flue gas after electrostatic precipitation step is sprayed with the alkali lye in vertical shaft electric field and mixes, grey particle trickle in flue gas and sulfur dioxide just can in the gathering of electric field force, alkali lye spraying, catch, be gathered into little group under coalescence effect and stick on the electrode of vertical shaft electric field; By evaporation baking step, the little group be gathered on electrode can be made to rush in evaporation drying box in the lump together with the current that alkali lye is formed, the waste heat of evaporation drying box and flue gas is jointly by buck evaporate to dryness, purify the clean flue gas obtained to discharge through evaporation drying box simultaneously, adopt vertical shaft electric field and the method coordinating alkali lye to spray, the trickle grey particle in flue gas can be made fully to mix with the alkali lye after atomization, slough the sulfur dioxide in flue gas; Ash after evaporation baking step, aqueous mixtures can be discharged again in time, effectively can prevent secondarily polluted water; Whole technical scheme reaches good gas cleaning effect.
Embodiment 2
See Fig. 1, a kind of purifying method for boiler fume, comprises electrostatic precipitation step and desulfurized step, also comprises evaporation baking step, described electrostatic precipitation step refers to introduces electrostatic precipitator 1 by the flue gas in boiler flue, and electrostatic precipitator 1 removes the most of dust in flue gas; Described desulfurized step refers to that the flue gas after electrostatic precipitation step is sprayed with the alkali lye in vertical shaft electric field 2 and mixes, grey particle trickle in flue gas and sulfur dioxide electric field force, alkali lye spraying gathering, catch, be gathered into little group under coalescence effect and stick on the electrode 3 of vertical shaft electric field 2; Described evaporation baking step refers to that soot particle residual after desulfurized step is rushed in evaporation drying box 5 by the current that sprayer 4 is formed, and buck evaporate to dryness is obtained final clean flue gas with the waste heat of flue gas by evaporation drying box 5 jointly.
Also comprise flue gas and draw step, described flue gas is drawn step and is referred to that the flue gas after evaporation baking step is sent to chimney by induced draft blower withdraws and enters air.
The present embodiment is a better embodiment, can be pumped out by evaporation drying box clean flue gas out fast by air-introduced machine, and is sent to chimney and enters air, effectively prevents flue gas from returning and alters.
Embodiment 3
See Fig. 2, a kind of purifying method for boiler fume, comprises electrostatic precipitation step and desulfurized step, also comprises evaporation baking step, described electrostatic precipitation step refers to introduces electrostatic precipitator 1 by the flue gas in boiler flue, and electrostatic precipitator 1 removes the most of dust in flue gas; Described desulfurized step refers to that the flue gas after electrostatic precipitation step is sprayed with the alkali lye in vertical shaft electric field 2 and mixes, grey particle trickle in flue gas and sulfur dioxide electric field force, alkali lye spraying gathering, catch, be gathered into little group under coalescence effect and stick on the electrode 3 of vertical shaft electric field 2; Described evaporation baking step refers to that soot particle residual after desulfurized step is rushed in evaporation drying box 5 by the current that sprayer 4 is formed, and buck evaporate to dryness is obtained final clean flue gas with the waste heat of flue gas by evaporation drying box 5 jointly.
Also comprise flue gas and draw step, described flue gas is drawn step and is referred to that the flue gas after evaporation baking step is sent to chimney by induced draft blower withdraws and enters air.
Described vertical shaft electric field 2 is made up of vertical shaft 6, conducting rod 7, the vertical shaft electrode 8 being positioned at vertical shaft 6 and the high-voltage electrostatic power 9 be positioned at outside vertical shaft 6, the positive pole of high-voltage electrostatic power 9 is connected by the outer wall of wire with vertical shaft 6, and negative pole is connected with vertical shaft electrode 8 by conducting rod 7.
Described vertical shaft electrode 8 is made up of corona discharge electrode 10 and the prickle wire 11 be distributed in around corona discharge electrode 10.
The present embodiment is another better embodiment, vertical shaft electric field is made up of vertical shaft, conducting rod, the electrode being positioned at vertical shaft and the high-voltage electrostatic power be positioned at outside vertical shaft, the positive pole of high-voltage electrostatic power is connected with the outer wall of vertical shaft by wire, negative pole is by conducting rod and Electrode connection, adopt the vertical shaft electric field of this ad hoc structure, comparatively uniform electric field can be formed in vertical shaft, thus the trickle grey particle in flue gas is accumulated on electrode in a large number, be convenient to improve postorder dust removing effects.Electrode is made up of corona discharge electrode and the prickle wire be distributed in around corona discharge electrode, prickle wire electric discharge forms electric field, because Charged is contrary with the polarity of corona discharge electrode, in corona zone with near corona zone, Charged just can be deposited on corona discharge electrode by a very near part, thus reaches good dedusting object.
Embodiment 4
See Fig. 2, a kind of purifying method for boiler fume, comprises electrostatic precipitation step and desulfurized step, also comprises evaporation baking step, described electrostatic precipitation step refers to introduces electrostatic precipitator 1 by the flue gas in boiler flue, and electrostatic precipitator 1 removes the most of dust in flue gas; Described desulfurized step refers to that the flue gas after electrostatic precipitation step is sprayed with the alkali lye in vertical shaft electric field 2 and mixes, grey particle trickle in flue gas and sulfur dioxide electric field force, alkali lye spraying gathering, catch, be gathered into little group under coalescence effect and stick on the electrode 3 of vertical shaft electric field 2; Described evaporation baking step refers to that soot particle residual after desulfurized step is rushed in evaporation drying box 5 by the current that sprayer 4 is formed, and buck evaporate to dryness is obtained final clean flue gas with the waste heat of flue gas by evaporation drying box 5 jointly.
Also comprise flue gas and draw step, described flue gas is drawn step and is referred to that the flue gas after evaporation baking step is sent to chimney by induced draft blower withdraws and enters air.
Described vertical shaft electric field 2 is made up of vertical shaft 6, conducting rod 7, the vertical shaft electrode 8 being positioned at vertical shaft 6 and the high-voltage electrostatic power 9 be positioned at outside vertical shaft 6, the positive pole of high-voltage electrostatic power 9 is connected by the outer wall of wire with vertical shaft 6, and negative pole is connected with vertical shaft electrode 8 by conducting rod 7.
Described vertical shaft electrode 8 is made up of corona discharge electrode 10 and the prickle wire 11 be distributed in around corona discharge electrode 10.
The voltage of described high-voltage electrostatic power 9 is 20 kilovolts.
Described alkali lye spraying refers to and adopts sprayer 4 that the alkali lye ejection in alkali liquid tank 12 is formed vaporific alkali lye.
The pressure of described sprayer 4 is 2.2 MPas, the fountain height of alkali lye be double centner/hour.
The present embodiment is another better embodiment, the voltage of high-voltage electrostatic power is 20 kilovolts, the pressure of sprayer 4 is 2.2 MPas, the fountain height of alkali lye be double centner/hour, adopt specific atomisation pressure, can ensure that alkali lye is formed finely dispersed vaporific, adopt specific alkali lye fountain height, good desulfurized effect can be ensured, the excessive secondary pollution caused of alkali lye can be prevented again.
Embodiment 5
See Fig. 2 and Fig. 3, a kind of purifying method for boiler fume, comprises electrostatic precipitation step and desulfurized step, also comprises evaporation baking step, described electrostatic precipitation step refers to introduces electrostatic precipitator 1 by the flue gas in boiler flue, and electrostatic precipitator 1 removes the most of dust in flue gas; Described desulfurized step refers to that the flue gas after electrostatic precipitation step is sprayed with the alkali lye in vertical shaft electric field 2 and mixes, grey particle trickle in flue gas and sulfur dioxide electric field force, alkali lye spraying gathering, catch, be gathered into little group under coalescence effect and stick on the electrode 3 of vertical shaft electric field 2; Described evaporation baking step refers to that soot particle residual after desulfurized step is rushed in evaporation drying box 5 by the current that sprayer 4 is formed, and buck evaporate to dryness is obtained final clean flue gas with the waste heat of flue gas by evaporation drying box 5 jointly.
Also comprise flue gas and draw step, described flue gas is drawn step and is referred to that the flue gas after evaporation baking step is sent to chimney by induced draft blower withdraws and enters air.
Described vertical shaft electric field 2 is made up of vertical shaft 6, conducting rod 7, the vertical shaft electrode 8 being positioned at vertical shaft 6 and the high-voltage electrostatic power 9 be positioned at outside vertical shaft 6, the positive pole of high-voltage electrostatic power 9 is connected by the outer wall of wire with vertical shaft 6, and negative pole is connected with vertical shaft electrode 8 by conducting rod 7.
Described vertical shaft electrode 8 is made up of corona discharge electrode 10 and the prickle wire 11 be distributed in around corona discharge electrode 10.
The voltage of described high-voltage electrostatic power 9 is 30 kilovolts.
Described alkali lye spraying refers to and adopts sprayer 4 that the alkali lye ejection in alkali liquid tank 12 is formed vaporific alkali lye.
The pressure of described sprayer 4 is 2.4 MPas, and the fountain height of alkali lye is 150 kgs/hr.
Described sprayer 4 is made up of the rotating disc 14 be enclosed within sparge pipe 13, the motor 15 driving rotating disc 14 to rotate and the shower nozzle 16 be connected on rotating disc 14, and shower nozzle 16 is connected with sparge pipe 13.
Be provided with the insulating frame 17 for fixing conducting rod 7 above described sprayer 4, insulating frame 17 is fixedly connected on the inwall of vertical shaft 6.
The present embodiment is another better embodiment, the motor that sprayer is rotated by the rotating disc be enclosed within sparge pipe, driving rotating disc is formed with the shower nozzle be connected on the rotating pan, shower nozzle is connected with sparge pipe, adopt the sprayer of this ad hoc structure, shower nozzle can rotate freely, the spraying that alkali lye is formed is attached on electrode more uniformly, thus farthest adsorbs the sulfur dioxide in flue gas, reaches good desulfurized effect.Be provided with the insulating frame for fixing conducting rod above sprayer, insulating frame is fixedly connected on the inwall of vertical shaft, and insulating frame can play good support, firmly act on conducting rod, prevents conducting rod from shaking.
Embodiment 6
See Fig. 4 and Fig. 5, a kind of purifying method for boiler fume, comprises electrostatic precipitation step and desulfurized step, also comprises evaporation baking step, described electrostatic precipitation step refers to introduces electrostatic precipitator 1 by the flue gas in boiler flue, and electrostatic precipitator 1 removes the most of dust in flue gas; Described desulfurized step refers to that the flue gas after electrostatic precipitation step is sprayed with the alkali lye in vertical shaft electric field 2 and mixes, grey particle trickle in flue gas and sulfur dioxide electric field force, alkali lye spraying gathering, catch, be gathered into little group under coalescence effect and stick on the electrode 3 of vertical shaft electric field 2; Described evaporation baking step refers to that soot particle residual after desulfurized step is rushed in evaporation drying box 5 by the current that sprayer 4 is formed, and buck evaporate to dryness is obtained final clean flue gas with the waste heat of flue gas by evaporation drying box 5 jointly.
Also comprise flue gas and draw step, described flue gas is drawn step and is referred to that the flue gas after evaporation baking step is sent to chimney by induced draft blower withdraws and enters air.
Described vertical shaft electric field 2 is made up of vertical shaft 6, conducting rod 7, the vertical shaft electrode 8 being positioned at vertical shaft 6 and the high-voltage electrostatic power 9 be positioned at outside vertical shaft 6, the positive pole of high-voltage electrostatic power 9 is connected by the outer wall of wire with vertical shaft 6, and negative pole is connected with vertical shaft electrode 8 by conducting rod 7.
Described vertical shaft electrode 8 is made up of corona discharge electrode 10 and the prickle wire 11 be distributed in around corona discharge electrode 10.
The voltage of described high-voltage electrostatic power 9 is 50 kilovolts.
Described alkali lye spraying refers to and adopts sprayer 4 that the alkali lye ejection in alkali liquid tank 12 is formed vaporific alkali lye.
The pressure of described sprayer 4 is 2.5 MPas, and the fountain height of alkali lye is 200 kgs/hr.
Described sprayer 4 is made up of the rotating disc 14 be enclosed within sparge pipe 13, the motor 15 driving rotating disc 14 to rotate and the shower nozzle 16 be connected on rotating disc 14, and shower nozzle 16 is connected with sparge pipe 13.
Be provided with the insulating frame 17 for fixing conducting rod 7 above described sprayer 4, insulating frame 17 is fixedly connected on the inwall of vertical shaft 6.
The top of described insulating frame 17 is provided with porous homogenizing plate 18, and porous homogenizing plate 18 is slidably connected on the inwall of vertical shaft 6.
Described shower nozzle 16 is made up of sprinkler body and the many venturi jet pipes 19 be embedded on sprinkler body, and many venturi jet pipes 19 are evenly arranged on sprinkler body.
The present embodiment is another better embodiment, the top of insulating frame is provided with porous homogenizing plate, porous homogenizing plate is slidably connected on the inwall of vertical shaft, guiding peptizaiton can be played to flue gas by porous homogenizing plate, prevent flue gas localized clusters, thus enable the more evenly comprehensive trickle grey particle adsorbed in flue gas of the electrode in vertical shaft electric field, improve flue gas ash removal effect further.Shower nozzle is made up of sprinkler body and the many venturi jet pipes be embedded on sprinkler body, many venturi jet pipes are evenly arranged on sprinkler body, adopt venturi jet pipe, alkali lye in sparge pipe forms an acceleration by venturi jet pipe, alkali lye after ejection is more easily formed vaporific, thus the sulfur dioxide of alkali lye fully and in flue gas is reacted, improve flue gas desulfurization effect further.
Embodiment 7
See Fig. 5 and Fig. 6, a kind of purifying method for boiler fume, comprises electrostatic precipitation step and desulfurized step, also comprises evaporation baking step, described electrostatic precipitation step refers to introduces electrostatic precipitator 1 by the flue gas in boiler flue, and electrostatic precipitator 1 removes the most of dust in flue gas; Described desulfurized step refers to that the flue gas after electrostatic precipitation step is sprayed with the alkali lye in vertical shaft electric field 2 and mixes, grey particle trickle in flue gas and sulfur dioxide electric field force, alkali lye spraying gathering, catch, be gathered into little group under coalescence effect and stick on the electrode 3 of vertical shaft electric field 2; Described evaporation baking step refers to that soot particle residual after desulfurized step is rushed in evaporation drying box 5 by the current that sprayer 4 is formed, and buck evaporate to dryness is obtained final clean flue gas with the waste heat of flue gas by evaporation drying box 5 jointly.
Also comprise flue gas and draw step, described flue gas is drawn step and is referred to that the flue gas after evaporation baking step is sent to chimney by induced draft blower withdraws and enters air.
Described vertical shaft electric field 2 is made up of vertical shaft 6, conducting rod 7, the vertical shaft electrode 8 being positioned at vertical shaft 6 and the high-voltage electrostatic power 9 be positioned at outside vertical shaft 6, the positive pole of high-voltage electrostatic power 9 is connected by the outer wall of wire with vertical shaft 6, and negative pole is connected with vertical shaft electrode 8 by conducting rod 7.
Described vertical shaft electrode 8 is made up of corona discharge electrode 10 and the prickle wire 11 be distributed in around corona discharge electrode 10.
The voltage of described high-voltage electrostatic power 9 is 55 kilovolts.
Described alkali lye spraying refers to and adopts sprayer 4 that the alkali lye ejection in alkali liquid tank 12 is formed vaporific alkali lye.
The pressure of described sprayer 4 is 2.6 MPas, and the fountain height of alkali lye is 230 kgs/hr.
Described sprayer 4 is made up of the rotating disc 14 be enclosed within sparge pipe 13, the motor 15 driving rotating disc 14 to rotate and the shower nozzle 16 be connected on rotating disc 14, and shower nozzle 16 is connected with sparge pipe 13.
Be provided with the insulating frame 17 for fixing conducting rod 7 above described sprayer 4, insulating frame 17 is fixedly connected on the inwall of vertical shaft 6.
The top of described insulating frame 17 is provided with porous homogenizing plate 18, and porous homogenizing plate 18 is slidably connected on the inwall of vertical shaft 6.
Described shower nozzle 16 is made up of sprinkler body and the many venturi jet pipes 19 be embedded on sprinkler body, and many venturi jet pipes 19 are evenly arranged on sprinkler body.
The bottom of described alkali liquid tank 12 is connected with three-way pipe 20, three-way pipe 20 is connected with three sparge pipes, 13, three sparge pipes 13 are all connected with a sprayer 4, three sprayers 4 are triangularly arranged in vertical shaft 6.
The present embodiment is another better embodiment, the bottom of alkali liquid tank is connected with three-way pipe, three-way pipe is connected with three sparge pipes, three sparge pipes are all connected with a sprayer, three sprayers are triangularly arranged in vertical shaft, and each sprayer can both rotate freely, and spatially can form multi-angle spraying, the maximized sulfur dioxide in flue gas and the alkali lye of making reacts, and greatly improves flue gas desulfurization effect.
Embodiment 8
See Fig. 5-Fig. 7, a kind of purifying method for boiler fume, comprises electrostatic precipitation step and desulfurized step, also comprises evaporation baking step, described electrostatic precipitation step refers to introduces electrostatic precipitator 1 by the flue gas in boiler flue, and electrostatic precipitator 1 removes the most of dust in flue gas; Described desulfurized step refers to that the flue gas after electrostatic precipitation step is sprayed with the alkali lye in vertical shaft electric field 2 and mixes, grey particle trickle in flue gas and sulfur dioxide electric field force, alkali lye spraying gathering, catch, be gathered into little group under coalescence effect and stick on the electrode 3 of vertical shaft electric field 2; Described evaporation baking step refers to that soot particle residual after desulfurized step is rushed in evaporation drying box 5 by the current that sprayer 4 is formed, and buck evaporate to dryness is obtained final clean flue gas with the waste heat of flue gas by evaporation drying box 5 jointly.
Also comprise flue gas and draw step, described flue gas is drawn step and is referred to that the flue gas after evaporation baking step is sent to chimney by induced draft blower withdraws and enters air.
Described vertical shaft electric field 2 is made up of vertical shaft 6, conducting rod 7, the vertical shaft electrode 8 being positioned at vertical shaft 6 and the high-voltage electrostatic power 9 be positioned at outside vertical shaft 6, the positive pole of high-voltage electrostatic power 9 is connected by the outer wall of wire with vertical shaft 6, and negative pole is connected with vertical shaft electrode 8 by conducting rod 7.
Described vertical shaft electrode 8 is made up of corona discharge electrode 10 and the prickle wire 11 be distributed in around corona discharge electrode 10.
The voltage of described high-voltage electrostatic power 9 is 60 kilovolts.
Described alkali lye spraying refers to and adopts sprayer 4 that the alkali lye ejection in alkali liquid tank 12 is formed vaporific alkali lye.
The pressure of described sprayer 4 is 2.8 MPas, and the fountain height of alkali lye is 300 kgs/hr.
Described sprayer 4 is made up of the rotating disc 14 be enclosed within sparge pipe 13, the motor 15 driving rotating disc 14 to rotate and the shower nozzle 16 be connected on rotating disc 14, and shower nozzle 16 is connected with sparge pipe 13.
Be provided with the insulating frame 17 for fixing conducting rod 7 above described sprayer 4, insulating frame 17 is fixedly connected on the inwall of vertical shaft 6.
The top of described insulating frame 17 is provided with porous homogenizing plate 18, and porous homogenizing plate 18 is slidably connected on the inwall of vertical shaft 6.
Described shower nozzle 16 is made up of sprinkler body and the many venturi jet pipes 19 be embedded on sprinkler body, and many venturi jet pipes 19 are evenly arranged on sprinkler body.
The bottom of described alkali liquid tank 12 is connected with three-way pipe 20, three-way pipe 20 is connected with three sparge pipes, 13, three sparge pipes 13 are all connected with a sprayer 4, three sprayers 4 are triangularly arranged in vertical shaft 6.
Described evaporation drying box 5 by casing 21, be fixed on the heater 22 in casing 21 and the supporting plate 23 be slidably connected on casing 21 inwall is formed, the sidewall of casing 21 is run through in one end of supporting plate 23.
Temperature in described evaporation drying box 5 is 130-150 degree Celsius.
The present embodiment is preferred forms, flue gas after electrostatic precipitation step is sprayed with the alkali lye in vertical shaft electric field and mixes, grey particle trickle in flue gas and sulfur dioxide just can in the gathering of electric field force, alkali lye spraying, catch, be gathered into little group under coalescence effect and stick on the electrode of vertical shaft electric field; By evaporation baking step, the little group be gathered on electrode can be made to rush in evaporation drying box in the lump together with the current that alkali lye is formed, the waste heat of evaporation drying box and flue gas is jointly by buck evaporate to dryness, purify the clean flue gas obtained to discharge through evaporation drying box simultaneously, adopt vertical shaft electric field and the method coordinating alkali lye to spray, the trickle grey particle in flue gas can be made fully to mix with the alkali lye after atomization, slough the sulfur dioxide in flue gas; Ash after evaporation baking step, aqueous mixtures can be discharged again in time, effectively can prevent secondarily polluted water; Whole technical scheme reaches good gas cleaning effect.Evaporation drying box by casing, be fixed on the heater in casing and the supporting plate be slidably connected on cabinet wall is formed, the sidewall of casing is run through in one end of supporting plate, heater coordinates the waste heat of flue gas, rapidly by ash, aqueous mixtures evaporate to dryness, and just can remove the dust after evaporate to dryness in time by pull-out supporting plate.Temperature in evaporation drying box is 130-150 degree Celsius, adopts this specific temperature, coordinates flue gas own temperature that ash, aqueous mixtures just can be made rapidly by evaporate to dryness, need not too much auxiliary heating, effectively saves energy consumption.
Claims (14)
1. a purifying method for boiler fume, comprise electrostatic precipitation step and desulfurized step, it is characterized in that: also comprise evaporation baking step, described electrostatic precipitation step refers to introduces electrostatic precipitator (1) by the flue gas in boiler flue, the most of dust in electrostatic precipitator (1) removing flue gas; Described desulfurized step refers to that the flue gas after electrostatic precipitation step is sprayed with the alkali lye in vertical shaft electric field (2) and mixes, grey particle trickle in flue gas and sulfur dioxide electric field force, alkali lye spraying gathering, catch, be gathered into little group under coalescence effect and stick on the electrode (3) of vertical shaft electric field (2); Described evaporation baking step refers to that soot particle residual after desulfurized step is rushed in evaporation drying box (5) by the current that sprayer (4) is formed, and buck evaporate to dryness is obtained final clean flue gas with the waste heat of flue gas by evaporation drying box (5) jointly.
2. a kind of purifying method for boiler fume according to claim 1, is characterized in that: also comprise flue gas and draw step, and described flue gas is drawn step and referred to that the flue gas after evaporation baking step is sent to chimney by induced draft blower withdraws and enters air.
3. a kind of purifying method for boiler fume according to claim 1, it is characterized in that: described vertical shaft electric field (2) by vertical shaft (6), conducting rod (7), be positioned at vertical shaft (6) vertical shaft electrode (8) and be positioned at vertical shaft (6) high-voltage electrostatic power outward (9) and form, the positive pole of high-voltage electrostatic power (9) is connected by the outer wall of wire with vertical shaft (6), and negative pole is connected with vertical shaft electrode (8) by conducting rod (7).
4. a kind of purifying method for boiler fume according to claim 3, is characterized in that: described vertical shaft electrode (8) is made up of corona discharge electrode (10) and the prickle wire (11) be distributed in around corona discharge electrode (10).
5. a kind of purifying method for boiler fume according to claim 3, is characterized in that: the voltage of described high-voltage electrostatic power (9) is 20-60 kilovolt continuously adjustabe.
6. a kind of purifying method for boiler fume according to claim 1, is characterized in that: described alkali lye spraying refers to and adopts sprayer (4) that the alkali lye ejection in alkali liquid tank (12) is formed vaporific alkali lye.
7. a kind of purifying method for boiler fume according to claim 1 or 5, it is characterized in that: the pressure of described sprayer (4) is 2.2-2.8 MPa, the fountain height of alkali lye is 100-300 kg/hr.
8. a kind of purifying method for boiler fume according to claim 6, it is characterized in that: described sprayer (4) is made up of the rotating disc (14) be enclosed within sparge pipe (13), the motor (15) driving rotating disc (14) to rotate and the shower nozzle (16) be connected on rotating disc (14), and shower nozzle (16) is connected with sparge pipe (13).
9. a kind of purifying method for boiler fume according to claim 8, is characterized in that: described sprayer (4) top is provided with the insulating frame (17) for fixing conducting rod (7), and insulating frame (17) is fixedly connected on the inwall of vertical shaft (6).
10. a kind of purifying method for boiler fume according to claim 9, is characterized in that: the top of described insulating frame (17) is provided with porous homogenizing plate (18), and porous homogenizing plate (18) is slidably connected on the inwall of vertical shaft (6).
11. a kind of purifying method for boiler fume according to claim 10, is characterized in that: described shower nozzle (16) is made up of sprinkler body and the many venturi jet pipes (19) be embedded on sprinkler body, and many venturi jet pipes (19) are evenly arranged on sprinkler body.
12. a kind of purifying method for boiler fume according to claim 11, it is characterized in that: the bottom of described alkali liquid tank (12) is connected with three-way pipe (20), three-way pipe (20) is connected with three sparge pipes (13), three sparge pipes (13) are all connected with a sprayer (4), three sprayers (4) are triangularly arranged in vertical shaft (6).
13. a kind of purifying method for boiler fume according to claim 12, it is characterized in that: described evaporation drying box (5) by casing (21), be fixed on the heater (22) in casing (21) and the supporting plate (23) be slidably connected on casing (21) inwall is formed, the sidewall of casing (21) is run through in one end of supporting plate (23).
14. a kind of purifying method for boiler fume according to claim 13, is characterized in that: the temperature in described evaporation drying box (5) is 130-150 degree Celsius.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108079714A (en) * | 2017-12-06 | 2018-05-29 | 宁波市江北义盈工贸有限公司 | A kind of boiler dust-extraction unit |
| CN110721582A (en) * | 2019-09-17 | 2020-01-24 | 上海蓝魂环保科技有限公司 | Desulfurizing tower for seawater desulfurization of ships |
| CN113477011A (en) * | 2021-07-26 | 2021-10-08 | 塔里木大学 | Dust device for environmental protection |
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| CN113477011B (en) * | 2021-07-26 | 2022-05-20 | 塔里木大学 | Dust device for environmental protection |
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