CN104140188A - Energy-saving type sewage sludge harmless treatment method - Google Patents
Energy-saving type sewage sludge harmless treatment method Download PDFInfo
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- CN104140188A CN104140188A CN201410381267.XA CN201410381267A CN104140188A CN 104140188 A CN104140188 A CN 104140188A CN 201410381267 A CN201410381267 A CN 201410381267A CN 104140188 A CN104140188 A CN 104140188A
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Abstract
The invention discloses an energy-saving type sewage sludge harmless treatment method. The method includes the following steps of firstly, conducting continuous freezing on sludge through a freeze drying energy circulation system, and unfreezing the sludge after continuous freezing; secondly, conducting dewatering on the sludge, completely processed through freezing and unfreezing, in a filter pressing device, so that sludge with the low moisture content is obtained through filter pressing; thirdly, smashing the sludge in a smashing device; fourthly, conveying smashed sludge particles into a sludge drying device to be dried, dissipating heat through the freeze drying energy circulation system by means of a condenser, and transferring heat to air; fifthly, sending the sludge particles into an incinerator to be incinerated, making generated high-temperature smoke enter a waste heat boiler, making air heated by the condenser enter a second heat exchanger to continue to absorb heat, and unfreezing the sludge and drying the sludge particles through the formed high-temperature air. By means of the method, the sludge processing amount cannot be increased in the treatment process, and due to recycling of working medium energy, the freezing efficiency and the heat utilization rate of the sludge are increased.
Description
Technical field
The present invention relates to sewage sludge process field, specifically a kind of energy-saving sewage sludge method for innocent treatment.
Background technology
In sewage treatment process, produce a large amount of mud, its quantity accounts for the 0.3%-0.5% that processes the water yield, processing investment and the running cost of mud are very huge, generally account for the 20%-50% of sewage work's working cost for the expense of sludge treatment, to sewage disposal, have brought white elephant.The method of sludge treatment mainly contains conditioning, dehydration, dry, then burns, the Disposal Measures such as landfill, recycling.
Sludge dewatering is the very important ring of sludge treatment, and for mud, follow-up processing is disposed and had vital role.The key of sludge dewatering is to improve the dewatering of mud, current traditional treatment process is by adding flocculation agent and lime is first nursed one's health, then enter pressure filter and carry out mechanical dehydration, the mud outward transport that forms water ratio 60% left and right is dried, burning etc.Adding flocculation agent pretreatment process is the throwing out by flocculation agent, reduced the avidity of mud and water, changed the existence form of moisture in mud, in and sewage in contrary electric charge, compression double electric layer, plays adsorption bridging to de-steady flocculated particle, makes it form fast large flco, thereby make elimination of colloid stability cohesion, realize solid-liquid separation.Flocculant dosage is to account for the per-cent of sewage sludge solid dry weight, and different flocculant dosages can be distinguished to some extent.Although can significantly improve the dewatering of mud by adding the method for flocculation agent, but due to a large amount of flocculation agent of needs, not only increase the cost of sludge treatment, and a large amount of flocculation agents can be increased in the mud after dehydration, strengthen the treatment capacity of mud, and the lime adding is alkalescence, for follow-up drying and incinerating equipment, there is certain corrosive nature, according to practical experience, for the mud that adds flocculation agent and lime, to burn, the incinerator life-span can decline.And the amount of heat that other pretreatment processs need to consume as ultrasonic wave, microwave treatment, and need to set up corresponding treatment unit; Adopt biological process and thermodynamic method need to consume a large amount of biotechnological formulations and heat.
Adopt freezing method to carry out pre-treatment in early stage to mud, mud is through destroying the bonding force of mud and water and destroy the structure (be similar to freezing after built-in bean curd) of colloid after repeatedly freezing, make elimination of colloid stability cohesion and membranolysis, make out to form the easily interstitial water to remove of mechanical means with the cell interior water dialysis that mechanical means is difficult to remove, the rapid sedimentation of mud granule, dewatering speed is front higher tens times than freezing, adopt freezing method not add medicament, can save reagent cost, and can additionally not increase the mud handling capacity in later stage, simultaneously, also not impact of life-span for subsequent processing device.In conjunction with mud method for subsequent processing, complete sludge deep minimizing and process again.
Yet, the freezing main dependence physical environment of prior art to mud, mud being placed in to outdoor dependence physical environment under arctic weather is cooled to-10 ℃ of left and right and carries out freezing and thaw, but low, the consuming time length of efficiency, if and just in southern area or cannot operate in situation non-winter, natural condition require comparatively harsh.In addition, prior art is used external force carry out freezing and thaw and need to freeze and heat dual energy mud mud, and cost is very high, therefore be difficult to apply.
Drying sludge is for by providing amount of heat that the moisture in mud is evaporated, so drying sludge is to need a large amount of heats, in addition, because mud also has a large amount of organic matters, there is certain combustion heat value characteristic, this for mud anhydration and incineration and recycling lay a good foundation.If adopt rational structure, the calorific value of mud self can be used for to pre-treatment in early stage and the drying process of mud, realize the effective use of whole Process Energy.
Summary of the invention
In view of this, the present invention is directed to the problems such as the increase flocculation agent of above-mentioned prior art existence can increase mud handling capacity and freezing efficiency is low, the waste gas of incineration rate of recovery is low, provide a kind for the treatment of processes can not increase mud handling capacity, the energy-saving sewage sludge method for innocent treatment that freezing efficiency is high and capacity usage ratio is high.
Technical solution of the present invention is, a kind of energy-saving sewage sludge method for innocent treatment of following structure is provided, and comprises the following steps:
1) by lyophilize energy cycle system, to the mud in mud freezing container, continue freezing, continue freezing rear mud is thawed, repeated multiple times freeze-thaw like this, this step is based on drying installation and lyophilize energy cycle system, described lyophilize energy cycle system comprises compressor, vaporizer, condenser and is arranged at the First Heat Exchanger in mud freezing container, the outlet side of compressor is connected with condenser, condenser is connected with vaporizer through throttling element, and vaporizer is connected with the inlet end of compressor through First Heat Exchanger; Described condenser is connected with drying installation bottom by gas pipeline, and vaporizer is connected with drying installation top by gas pipeline, and described condenser is connected by gas pipeline with vaporizer simultaneously;
2) in filter-pressing device, the mud after freeze-thaw processing finishes is dewatered, minute press filtration stage and press dewatering stage, make mud by press filtration, be become the bulk mud cake shape mud of low-water-content;
3) bulk mud cake shape mud carries out fragmentation in shredder assembly, forms little mud granule;
4) mud granule after fragmentation is delivered in sludge drying mechanism and is dried, by lyophilize energy cycle system, by condenser heat release, transfer heat to air, warm air enters sludge drying mechanism mud granule is dried.
5) dried mud granule is admitted in incinerator and burns, burn the high-temperature flue gas producing and enter waste heat boiler, heat-conducting oil pipes absorbs the heat of high-temperature flue gas, and be passed to the second interchanger, air after the device that is condensed heating enters into the second interchanger and continues to absorb heat, form high temperature air, high temperature air is after blower fan pressurization, by hot gas duct, enter drying installation and mud freezing container respectively, thereby the heat in waste heat boiler is thawed for mud and mud granule dry; This step is based on waste-heat recovery device, described waste-heat recovery device comprises waste heat boiler and is arranged at the heat-conducting oil pipes in waste heat boiler, waste heat boiler is extended at the two ends of heat-conducting oil pipes, and be connected with the second interchanger, thermal oil enters the second interchanger and transfers heat to air, air after heating is inputted respectively drying installation and mud freezing container, being dried and thawing for mud.
Adopt above method, the present invention compared with prior art, have the following advantages: adopt the present invention, utilized lyophilize energy cycle system, realized the freezing of mud in mud freezing container and being dried the mud in drying installation simultaneously, working medium is under compressor effect, output High Temperature High Pressure gaseous working medium, through condenser, heat in working medium is by absorption of air, transfer heat to air, air themperature raises, Temperature of Working reduces, warm air passes in drying installation material is dried, working medium is condensed and becomes high-pressure liquid, high-pressure liquid working medium becomes low-pressure liquid working medium after throttling element step-down, low-pressure liquid working medium enters into vaporizer, absorb the air heat (from material top air out) in vaporizer, to air cooling-down, after saturated air cooling, the moisture that it can hold reduces, unnecessary hydrogenesis becomes liquid water to drain by the water accumulating disc of vaporizer, after working medium heat absorption, from low-pressure liquid, become low pressure gaseous state (insufficient if working medium absorbs the heat of air, the working medium that can only guarantee operative liquid flashes to gaseous working medium, and the liquid refrigerant of remainder and gaseous working medium form two-phase working substance) enter into First Heat Exchanger, working medium absorbs the heat of mud in First Heat Exchanger, mud is cooled to needed freezing temp-10 ℃～-15 ℃ (this temperature range is better, but be not limited to this numerical range), now liquid working substance is gasificated into gaseous working medium, gaseous working medium enters in compressor.Mud is through freeze-thaw (thaw and can naturally thaw) repeatedly in mud freezing container, destroyed the structure of mud, mud through thawing enters filter-pressing device, filter-pressing device is pressed into bulk pie mud by mud, send into again shredder assembly and carry out fragmentation formation mud granule, mud granule is dried in drying installation, has realized the stage of mud and has processed.Due to without adding chemicals in mud, therefore treating processes can not increase mud handling capacity, the recycle of working medium energy has improved the freezing efficiency of mud greatly; Only need by a small amount of compressor energy of cost, working medium can be by the heat " carrying " that is several times as much as energy consumption of compressor in freezing container in loft drier, realize the freezing and drying sludge of mud simultaneously, solved the cold source of freezing needs, solved again the origin of heat of dry needs, make cold and heat reach an extraordinary balance, greatly improved heat service efficiency, energy-saving effect is obvious; Heat in waste heat boiler is recovered for thawing of mud and being dried of mud granule, has further promoted capacity usage ratio.
As preferably, in step 1) in, freezing temp is between-10 degrees Celsius to-15 degrees Celsius, and freezing time is 48 to 72 hours, and thaw point is between 20 degrees Celsius to 50 degrees Celsius, and thawing time is 3 to 9 hours, freeze-thaw hockets 3-5 time repeatedly.
As preferably, in step 2) in, filter-pressing device is plate-and-frame filter press, carries out mechanical dehydration in plate-and-frame filter press, first it is the press filtration stage, press filtration pressure is 1.0-1.2Mpa, and time of filter pressing is 1.5-2 hour, now moisture percentage in sewage sludge 65%-70%, enter into again the press dewatering stage, squeeze pressure is 1.5Mpa, and the squeezing time is 1 hour, now the about 60%-65% of moisture percentage in sewage sludge.
As preferably, in step 4) in, drying installation is Multi-layer panel-turnover, mud granule is fully contacted with air, and be evenly distributed, be 1 hour time of drying, drying temperature 60-100 ℃, after super-dry, the water ratio of mud is 10%-20%, and now vaporizer provides cold to mud freezing container, and condenser is to air heating, again through the heat exchange again of the second interchanger, form high temperature air, enter drying installation mud granule is dried, part high temperature air is simultaneously to the processing of thawing of freezing mud.
As preferably, in step 5) in, described waste heat boiler is provided with smoke eliminator, and described smoke eliminator removes the sour gas in flue gas and traps the particulate matter in flue gas.
As preferably, described mud freezing container is a plurality of, First Heat Exchanger is corresponding one by one with mud freezing container, the two ends of the First Heat Exchanger in a plurality of mud freezing containers are connected with compressor with vaporizer by working medium reversing valve respectively, the bottom of mud freezing container is provided with filtration, and the bottom of a plurality of mud freezing containers is communicated with filter-pressing device by liquid reversing valve and through fluid pipeline.Like this, the mud in a mud freezing container carry out freezing in, the mud of part mud freezing container carries out nature and thaws, what thawed is directly delivered in filter-pressing device, thereby improves processing efficiency, can produce continuously.
As preferably, described drying installation comprises loft drier and mud panel turnover mechanism, described mud panel turnover mechanism, and level is arranged on the vertical height of difference in loft drier, described mud panel turnover mechanism is staggered, and a mud panel turnover mechanism of bottommost layer stretches out outside loft drier.Like this, mud enters drying installation after fragmentation, first fall into the mud panel turnover mechanism the superiors, transmission along with mud panel turnover mechanism, mud drops on the mud panel turnover mechanism of lower one deck, the mud panel turnover mechanism of lower one deck commutates and drives to other one end, and so forth, can realize warm air and contact up and down with mud, omnibearing dry, improve drying effect, when dropping down onto a mud panel turnover mechanism of bottommost layer, because it stretches out outside loft drier, mud is sent to outside loft drier by it, enters next step operation and processes.
As preferably, described filter-pressing device is plate-and-frame filter press, plate-and-frame filter press comprises a plurality of sheet frames, below sheet frame, be provided with drawing-plate mechanism, described drawing-plate mechanism comprises polylith guiding piece and slide plate, is provided with articulated linkage, and is equipped with roller between adjacent two guiding pieces under every guiding piece, described polylith guiding piece is placed on slide plate, and can be rolled and be connected with slide plate by roller.Like this, by polylith drawing-plate mechanism, carry out pull, can realize the pull of a plurality of sheet frames, solved the current problem of a sheet frame of pull simultaneously, shorten the arm-tie time, improved the efficiency of press filtering of filter-pressing device.
Accompanying drawing explanation
Fig. 1 is sewage sludge advanced treatment apparatus schematic diagram of the present invention;
Fig. 2 is the structural representation of drawing-plate mechanism;
Fig. 3 is for adopting the present invention to carry out the FB(flow block) of sewage sludge advanced treatment.
As shown in the figure, 1, filter-pressing device, 1.1, sheet frame, 1.2, guiding piece, 1.3, slide plate, 1.4, articulated linkage, 1.5, roller, 2, shredder assembly, 3, drying installation, 3.1, loft drier, 3.2, mud panel turnover mechanism, 4, mud freezing container, 5, compressor, 6, vaporizer, 7, condenser, 8, First Heat Exchanger, 9, throttling element, 10, gas pipeline, 11, working medium reversing valve, 12, filtration, 13, liquid reversing valve, 14, fluid pipeline, 15, rotor pump, 16, incinerator, 17, waste heat boiler, 18, heat-conducting oil pipes, 19, the second interchanger, 20, hot gas duct, 21, smoke eliminator, 22, flue, 23, transfer mechanism, 24, blower fan.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in the figure, a kind of energy-saving sewage sludge method for innocent treatment of the present invention, comprises the following steps:
1) by lyophilize energy cycle system, to the mud in mud freezing container, continue freezing, continue freezing rear mud is thawed, repeated multiple times freeze-thaw like this, this step is based on drying installation 3 and lyophilize energy cycle system, described lyophilize energy cycle system comprises compressor 5, vaporizer 6, condenser 7 and is arranged at the First Heat Exchanger 8 in mud freezing container 4, the outlet side of compressor 5 is connected with condenser 6, condenser 7 is connected with vaporizer 6 through throttling element 9, and vaporizer 6 is connected with the inlet end of compressor 5 through First Heat Exchanger 8; Described condenser 7 is connected with drying installation 3 bottoms by gas pipeline 10, vaporizer 6 with by gas pipeline 10, be connected with drying installation 3 tops, simultaneously described condenser 7 is connected by gas pipeline 10 with vaporizer 6;
2) in filter-pressing device, the mud after freeze-thaw processing finishes is dewatered, minute press filtration stage and press dewatering stage, make mud by press filtration, be become the bulk mud cake shape mud of low-water-content;
3) bulk mud cake shape mud carries out fragmentation in shredder assembly, forms little mud granule;
4) mud granule after fragmentation is delivered in sludge drying mechanism and is dried, by lyophilize energy cycle system, by condenser heat release, transfer heat to air, warm air enters sludge drying mechanism mud granule is dried.
5) dried mud granule is admitted in incinerator and burns, burn the high-temperature flue gas producing and enter waste heat boiler, heat-conducting oil pipes absorbs the heat of high-temperature flue gas, and be passed to the second interchanger, air after the device that is condensed heating enters into the second interchanger and continues to absorb heat, form high temperature air, high temperature air is after blower fan pressurization, by hot gas duct, enter drying installation and mud freezing container respectively, thereby the heat in waste heat boiler is thawed for mud and mud granule dry; This step is based on waste-heat recovery device, waste-heat recovery device comprises waste heat boiler 17 and is arranged at the heat-conducting oil pipes 18 in waste heat boiler 17, in described waste heat boiler 17, be provided with heat-conducting oil pipes 18, heat-conducting oil pipes 18 carries out heat with air and transmits air heating, air after heating is inputted respectively drying installation 3 and mud freezing container 4, being dried and thawing for mud.
In step 1) in, freezing temp is between-10 degrees Celsius to-15 degrees Celsius, and freezing time is 48 to 72 hours, and thaw point is between 20 degrees Celsius to 50 degrees Celsius, and thawing time is 3 to 9 hours, freeze-thaw hockets 3-5 time repeatedly.
In step 2) in, filter-pressing device is plate-and-frame filter press, in plate-and-frame filter press, carrying out mechanical dehydration, is first the press filtration stage, and press filtration pressure is 1.0-1.2Mpa, time of filter pressing is 1.5-2 hour, moisture percentage in sewage sludge 65%-70% now, then enter into the press dewatering stage, squeeze pressure is 1.5Mpa, the squeezing time is 1 hour, now the about 60%-65% of moisture percentage in sewage sludge.
In step 4) in, drying installation is Multi-layer panel-turnover, and mud granule is fully contacted with air, and be evenly distributed, be 1 hour time of drying, drying temperature 60-100 ℃, and after super-dry, the water ratio of mud is 10%-20%, now vaporizer provides cold to mud freezing container, condenser is to air heating, then through the heat exchange again of the second interchanger, forms high temperature air, enter drying installation mud granule is dried, part high temperature air is simultaneously to the processing of thawing of freezing mud.
In step 5) in, described waste heat boiler is provided with smoke eliminator, and described smoke eliminator removes the sour gas in flue gas and traps the particulate matter in flue gas.
Sludge treatment equipment comprises filter-pressing device 1, shredder assembly 2, drying installation 3, incinerator 16 and waste heat boiler 17,1 pair of mud of filter-pressing device carries out by shredder assembly 2, carrying out break process after press filtration processing, after sludge crushing, enter drying installation 3 and carry out drying treatment, dried mud granule is sent into the interior burning of incinerator 16 (entering incinerator by transfer mechanism 23 from the feed opening of drying installation), burns the high-temperature flue gas producing and enters waste heat boiler 17.
Described mud freezing container 4 is a plurality of, First Heat Exchanger 8 is corresponding one by one with mud freezing container 4, the two ends of the First Heat Exchanger 8 in a plurality of mud freezing containers 4 are connected with compressor 5 with vaporizer 6 by working medium reversing valve 11 respectively, the bottom of mud freezing container 4 is provided with filtration 12, and the bottom of a plurality of mud freezing containers 4 is passed through liquid reversing valve 13 and is communicated with filter-pressing device 1 through fluid pipeline 14; Mud after thawing pumps into filter-pressing device 1 by rotor pump 15 from mud freezing container 4.
Described drying installation 3 comprises loft drier 3.1 and mud panel turnover mechanism 3.2, described mud panel turnover mechanism, level is arranged on the vertical height of difference in loft drier 3.1, and described mud plate turnover 3.2 structures are staggered, and a mud panel turnover mechanism 3.2 of bottommost layer stretches out outside loft drier 3.1.
Described filter-pressing device 1 is plate-and-frame filter press, plate-and-frame filter press comprises a plurality of sheet frames 1.1, below sheet frame 1.1, be provided with drawing-plate mechanism, described drawing-plate mechanism comprises polylith guiding piece 1.2 and slide plate 1.3, between adjacent two guiding pieces 1.2, be provided with articulated linkage 1.4, and being equipped with roller 1.5 1.2 times at every guiding piece, described polylith guiding piece 1.2 is placed on slide plate 1.3, and can be rolled and be connected with slide plate 1.3 by roller 1.5.
Sludge deep treatment process design parameter (parameter designing can make scheme optimization) flow process is:
1) in freezing temp-10 ℃～-15 ℃, freezing time, carry out repeatedly under 72 hours freezing;
2) between 20-50 ℃, thaw (can adopt normal temperature unfreezing), thawing time is about 6 hours;
3) in plate-and-frame filter press, carry out mechanical dehydration, first it is the press filtration stage, press filtration pressure is 1.0-1.2Mpa, time of filter pressing is 1.5-2 hour, moisture percentage in sewage sludge 65%-70% now, then enter into the press dewatering stage, squeeze pressure is 1.5Mpa, the squeezing time is 1 hour, now the about 60%-65% of moisture percentage in sewage sludge;
4) plate-and-frame filter press bulk mud cake shape mud is out carried out to fragmentation in mud mixing shredder assembly, form little mud granule, mud granule size is generally in 20mm left and right;
5) mud after fragmentation is delivered in drying installation and is dried, drying installation is Multi-layer panel-turnover, and be 1 hour time of drying, drying temperature 60-100 ℃, after super-dry, the water ratio of mud is 10%-20%, and now vaporizer provides cold to mud freezing container;
6) mud through super-dry is sent to incinerator and burns, 850 ℃ of flue gases of generation are discharged and are entered into waste heat boiler by flue;
7) in waste heat boiler, high-temperature flue gas transfers heat to thermal oil, and thermal oil is heated to 250 ℃ of left and right, and thermal oil enters into the second interchanger and transfers heat to air, air is heated, and the air after heating enters in drying installation mud is dried;
8) smoke eliminator of Heat Treatment device gas outlet setting removes the trapping with particulate matter to sour gas, makes the flue gas of discharging atmosphere meet environmental requirement.
Specific works principle is as follows:
Mud enters into mud freezing container, first under First Heat Exchanger effect, refrigeration working medium enter into First Heat Exchanger in, working medium is absorbed heat to mud, make the freezing temp of mud reach specified temperature, mud under-10 ℃～-15 ℃, freezing time 72 hours through repeatedly freezing, destroy the bonding force of mud and water and the structure of destruction colloid, make elimination of colloid stability cohesion and membranolysis, the rapid sedimentation of mud granule, dewatering significantly improves, and dewatering speed is front higher tens times than freezing, freezing end.Now, working medium reversing valve flows to and to commutate working medium, and working medium flow-reversal, in another mud freezing container, has now been passed into the air with certain temperature in freezing mud freezing container and thawed, air themperature is between 20-50 ℃, and thawing time is 6 hours.
After thawing, mud passes through fluid pipeline, enter rotor pump, in adding of rotor pump, depress and enter board and frame machine (plate-and-frame filter press) and start press filtration and carry out mechanical dehydration, after press filtration after a while, pull open sheet frame, the mud of mud cake shape drops in device for transporting objects, through device for transporting objects, be transported to crusher, crusher carries out fragmentation to mud cake, form little mud granule, mud granule size remains on 20mm left and right, become short grained mud to improve the specific surface area of mud, be beneficial to the contact area that increases mud and high temperature air in dry, improve drying rate and effect.
Little mud granule enters into the upper strata turnover panel in drying machine, drops from level to level from top to down, and in the process dropping, constantly upset of mud, all fully contacts each surface with air.Dry air contacts with mud from bottom to top, absorption of air the moisture of mud become the wet air that humidity is very high and after vaporizer, drop to below dew point, separate out moisture, the moisture of separating out is discharged through water accumulating disc, air continues to be heated after condenser, enters in loft drier mud is dried.Mud leaves loft drier after being heated and being dried after basecoat turnover panel.
Mud is transported to incinerator by device for transporting objects after leaving loft drier, adjusting enters a wind of combustion chamber, under refiner effect, make it in fluidized bed combustion state, because the medium in fluidized-bed is in suspended state, gas-solid can fully mix contact, in whole stove, the temperature of burning zone is comparatively even, and the approximately 850 ℃ of discharges of waste gas that produce after burning enter into waste heat boiler.Meanwhile, the thermal oil in waste heat boiler is heated to 250 ℃ by 220 ℃, and the thermal oil after being heated heats air by the second interchanger, and the air after heating enters into dehumidification system and thawing apparatus to drying sludge and the heat supply of thawing.Gas-cleaning installation is comprised of removing with particle collection two parts of sour gas, gas sweetening can adopt semidrying, in flue gas, spray into certain calcium oxide, make it to react with the acidic substance in flue gas, and by spraying plant, control moisture and reach spray-dired reaction process.Depickling reactant is essentially solid state, there will not be discharge of wastewater.In flue gas, particle collection can be realized in conjunction with cyclonic separator or cloth bag by filtering net, sprays into a certain amount of activated carbon grain powder before, the objectionable impuritiess such as absorption heavy metal in flue gas and Dioxins.Through purified gas, can discharge atmosphere, environmental pollution is few.
Below only just preferred embodiment of the present invention is described, but can not be interpreted as it is limitations on claims.The present invention is not only confined to above embodiment, and its concrete structure allows to change.In a word, all various variations of doing in the protection domain of independent claim of the present invention are all in protection scope of the present invention.
Claims (8)
1. an energy-saving sewage sludge method for innocent treatment, is characterized in that: comprise the following steps:
1) by lyophilize energy cycle system, to the mud in mud freezing container, continue freezing, continue freezing rear mud is thawed, repeated multiple times freeze-thaw like this, this step is based on drying installation (3) and lyophilize energy cycle system, described lyophilize energy cycle system comprises compressor (5), vaporizer (6), condenser (7) and be arranged at the First Heat Exchanger (8) in mud freezing container (4), the outlet side of compressor (5) is connected with condenser (6), condenser (7) is connected with vaporizer (6) through throttling element (9), vaporizer (6) is connected with the inlet end of compressor (5) through First Heat Exchanger (8), described condenser (7) is connected with drying installation (3) bottom by gas pipeline (10), vaporizer (6) is connected with drying installation (3) top by gas pipeline (10), and described condenser (7) is connected by gas pipeline (10) with vaporizer (6) simultaneously,
2) in filter-pressing device, the mud after freeze-thaw processing finishes is dewatered, minute press filtration stage and press dewatering stage, make mud by press filtration, be become the bulk mud cake shape mud of low-water-content;
3) bulk mud cake shape mud carries out fragmentation in shredder assembly, forms little mud granule;
4) mud granule after fragmentation is delivered in sludge drying mechanism and is dried, by lyophilize energy cycle system, by condenser heat release, transfer heat to air, warm air enters sludge drying mechanism mud granule is dried;
5) dried mud granule is admitted in incinerator and burns, burn the high-temperature flue gas producing and enter waste heat boiler, heat-conducting oil pipes absorbs the heat of high-temperature flue gas, and be passed to the second interchanger, air after the device that is condensed heating enters into the second interchanger and continues to absorb heat, form high temperature air, high temperature air is after blower fan pressurization, by hot gas duct, enter drying installation and mud freezing container respectively, thereby the heat in waste heat boiler is thawed for mud and mud granule dry; This step is based on waste-heat recovery device, waste-heat recovery device comprises waste heat boiler (17) and is arranged at the heat-conducting oil pipes (18) in waste heat boiler (17), in described waste heat boiler (17), be provided with heat-conducting oil pipes (18), heat-conducting oil pipes (18) carries out heat with air and transmits air heating, air after heating is inputted respectively drying installation (3) and mud freezing container (4), being dried and thawing for mud.
2. energy-saving sewage sludge method for innocent treatment according to claim 1, it is characterized in that: in step 1) in, freezing temp is between-10 degrees Celsius to-15 degrees Celsius, freezing time is 48 to 72 hours, thaw point is between 20 degrees Celsius to 50 degrees Celsius, thawing time is 3 to 9 hours, and freeze-thaw hockets 3-5 time repeatedly.
3. energy-saving sewage sludge method for innocent treatment according to claim 1, it is characterized in that: in step 2) in, filter-pressing device is plate-and-frame filter press, carries out mechanical dehydration in plate-and-frame filter press, first it is the press filtration stage, press filtration pressure is 1.0-1.2Mpa, and time of filter pressing is 1.5-2 hour, now moisture percentage in sewage sludge 65%-70%, enter into again the press dewatering stage, squeeze pressure is 1.5Mpa, and the squeezing time is 1 hour, now the about 60%-65% of moisture percentage in sewage sludge.
4. according to the energy-saving sewage sludge method for innocent treatment described in claim 1 or 2 or 3, it is characterized in that: in step 4) in, drying installation is Multi-layer panel-turnover, mud granule is fully contacted with air, and be evenly distributed, be 1 hour time of drying, drying temperature 60-100 ℃, after super-dry, the water ratio of mud is 10%-20%, now vaporizer provides cold to mud freezing container, condenser is to air heating, again through the heat exchange again of the second interchanger, form high temperature air, entering drying installation is dried mud granule, part high temperature air is simultaneously to the processing of thawing of freezing mud.
5. according to the energy-saving sewage sludge method for innocent treatment described in claim 1 or 2 or 3, it is characterized in that: in step 5) in, described waste heat boiler is provided with smoke eliminator, and described smoke eliminator removes the sour gas in flue gas and traps the particulate matter in flue gas.
6. energy-saving sewage sludge method for innocent treatment according to claim 1, it is characterized in that: described mud freezing container (4) is for a plurality of, First Heat Exchanger (8) is corresponding one by one with mud freezing container (4), the two ends of the First Heat Exchanger (8) in a plurality of mud freezing containers (4) are connected with compressor (5) with vaporizer (6) by working medium reversing valve (11) respectively, the bottom of mud freezing container (4) is provided with filtration (12), the bottom of a plurality of mud freezing containers (4) is passed through liquid reversing valve (13) and is communicated with filter-pressing device (1) through fluid pipeline (14), mud after thawing pumps into filter-pressing device (1) by rotor pump (15) from mud freezing container (4).
7. sewage sludge deep treatment method according to claim 1, it is characterized in that: described drying installation (3) comprises loft drier (3.1) and mud panel turnover mechanism (3.2), described mud panel turnover mechanism, level is arranged on the vertical height of difference in loft drier (3.1), described mud panel turnover mechanism (3.2) is staggered, and a mud panel turnover mechanism (3.2) of bottommost layer stretches out outside loft drier (3.1).
8. sewage sludge deep treatment method according to claim 1 and 2, it is characterized in that: described filter-pressing device (1) is plate-and-frame filter press, plate-and-frame filter press comprises a plurality of sheet frames (1.1), in sheet frame (1.1) below, be provided with drawing-plate mechanism, described drawing-plate mechanism comprises polylith guiding piece (1.2) and slide plate (1.3), between adjacent two guiding pieces (1.2), be provided with articulated linkage (1.4), and under every guiding piece (1.2), be equipped with roller (1.5), described polylith guiding piece (1.2) is placed on slide plate (1.3), and can roll and be connected with slide plate (1.3) by roller (1.5).
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