CN104140188B - Energy-saving sewage sludge method for innocent treatment - Google Patents
Energy-saving sewage sludge method for innocent treatment Download PDFInfo
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- CN104140188B CN104140188B CN201410381267.XA CN201410381267A CN104140188B CN 104140188 B CN104140188 B CN 104140188B CN 201410381267 A CN201410381267 A CN 201410381267A CN 104140188 B CN104140188 B CN 104140188B
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Abstract
The invention discloses a kind of energy-saving sewage sludge method for innocent treatment, comprise the following steps: 1) mud is carried out lasting freezing by lyophilize Power Cycle, continue freezing rear mud to be thawed; 2) in filter-pressing device, the mud after terminating through freeze-thaw process is dewatered, make mud be become the mud of low-water-content by press filtration; 3) mud carries out fragmentation in shredder assembly; 4) mud granule after fragmentation is delivered in sludge drying mechanism carry out drying, by lyophilize Power Cycle by condenser heat rejection, transfer heat to air; 5) mud granule is admitted in incinerator and burns, and the high-temperature flue gas produced enters waste heat boiler, and the air after the device that is condensed heating enters into the second interchanger to be continued to absorb heat, forms high temperature air and thaws to mud and mud granule drying.The present invention can not increase mud handling capacity in treating processes, and the recycle of working medium energy improves freezing efficiency and the heat utilization ratio of mud.
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
A large amount of mud is produced in sewage treatment process, its quantity accounts for the 0.3%-0.5% of the process water yield, the process investment of mud and running cost are very huge, and the expense for sludge treatment generally accounts for the 20%-50% of sewage work's working cost, brings white elephant to sewage disposal.The method of sludge treatment mainly contains conditioning, dehydration, dry, then carries out burning, the Disposal Measures such as landfill, recycling.
Sludge dewatering is the very important ring of sludge treatment, disposes have vital role for the process that mud is follow-up.The key of sludge dewatering improves 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, drying, burning etc. are carried out in the mud outward transport forming water ratio about 60%.Adding flocculation agent pretreatment process is throwing out by flocculation agent, reduce the avidity of mud and water, change the existence form of moisture in mud, in and contrary electric charge in sewage, compression double electric layer, plays adsorption bridging to de-steady flocculated particle, makes it form large flco fast, thus elimination of colloid stability is condensed, realize solid-liquid separation.Flocculant dosage is to account for the percentages of sewage sludge solid dry weight, and different flocculant dosages can be distinguished to some extent.Although significantly can be improved the dewatering of mud by the method adding flocculation agent, but owing to needing a large amount of flocculation agents, not only increase the cost of sludge treatment, and a large amount of flocculation agents can be increased in the mud after dehydration, strengthens the treatment capacity of mud, and the lime added is in alkalescence, for follow-up drying and incinerating equipment, there is certain corrosive nature, according to practical experience, burn for the mud adding flocculation agent and lime, the incinerator life-span can decline.And the amount of heat that other pretreatment processs consume as ultrasonic wave, microwave treatment needs, and need to set up corresponding treatment unit; Biological process and thermodynamic method is adopted to need to consume a large amount of biotechnological formulations and heat.
Freezing method is adopted to carry out pre-treatment in early stage to mud, mud can destroy 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, elimination of colloid stability is condensed and membranolysis, the cell interior water dialysis being mechanically difficult to remove is made out to form mechanical means easily with the interstitial water removed, the rapid sedimentation of mud granule, dewatering speed is front higher tens times than freezing, freezing method is adopted not add medicament, reagent cost can be saved, and additionally can not increase the mud handling capacity in later stage, simultaneously, life-span for subsequent processing device does not also affect.Again in conjunction with mud method for subsequent processing, complete sludge deep minimizing process.
But, prior art is to the freezing main dependence physical environment of mud, namely mud is placed in outdoor dependence physical environment under arctic weather to be cooled to about-10 DEG C and to carry out freezing and thaw, but low, the consuming time length of efficiency, if and just cannot operate in situation in southern area or non-winter, natural condition requirement comparatively harshness.In addition, prior art uses external force carry out freezing to mud and thaw and need freeze to mud and heat dual energy, and cost is very high, therefore is difficult to apply.
Drying sludge for by providing amount of heat by the moisture evaporation in mud, so drying sludge needs a large amount of heat, in addition, because mud also has a large amount of organic matter, have certain combustion heat value characteristic, this anhydration and incineration being mud and recycling are laid a good foundation.If adopt rational structure, the calorific value of mud self can be used for 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 and can not increase mud handling capacity, the high and energy-saving sewage sludge method for innocent treatment that capacity usage ratio is high of freezing efficiency.
Technical solution of the present invention is, provides a kind of energy-saving sewage sludge method for innocent treatment of following structure, comprises the following steps:
1) mud in mud freezing container is carried out lasting freezing by lyophilize Power Cycle, continue freezing rear mud to be thawed, repeated multiple times freeze-thaw like this, this step is based on drying installation and lyophilize Power Cycle, the First Heat Exchanger that described lyophilize Power Cycle comprises compressor, vaporizer, condenser and is arranged 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 bottom drying installation by gas pipeline, and vaporizer is connected with drying installation top by gas pipeline, and the condenser is simultaneously connected by gas pipeline with vaporizer;
2) in filter-pressing device, the mud after terminating through freeze-thaw process is dewatered, point press filtration stage and press dewatering stage, make mud be become the bulk mud cake shape mud of low-water-content by press filtration;
3) bulk mud cake shape mud carries out fragmentation in shredder assembly, forms little mud granule;
4) delivered in sludge drying mechanism by the mud granule after fragmentation and carry out drying, by lyophilize Power Cycle by condenser heat rejection, transfer heat to air, warm air enters sludge drying mechanism and carries out drying to mud granule.
5) dried mud granule is admitted in incinerator and burns, burn the high-temperature flue gas produced 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 to be continued to absorb heat, form high temperature air, high temperature air is after blower fan pressurization, enter drying installation and mud freezing container respectively by hot gas duct, thus the heat in waste heat boiler is used for mud and thaws and the drying of mud granule; 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 drying installation and mud freezing container respectively, for mud drying and thaw.
Adopt above method, the present invention compared with prior art, have the following advantages: adopt the present invention, make use of lyophilize Power Cycle, achieve the freezing of mud in mud freezing container and the drying to the mud in drying installation simultaneously, working medium is under compressor effect, export 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 and carries out drying to material, 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 atmospheric heat in vaporizer (from material top air) out, to air cooling-down, after saturated air cooling, the moisture that it can hold reduces, unnecessary hydrogenesis becomes liquid water to be drained by the water accumulating disc of vaporizer, low-pressure gaseous is become (if the heat of working medium absorption air is insufficient from low-pressure liquid after working medium heat absorption, the working medium of guarantee section liquid state can only flash 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, (this temperature range is better mud to be cooled to required freezing temp-10 DEG C ~-15 DEG C, but be not limited to this numerical range), now liquid working substance is then gasificated into gaseous working medium, gaseous working medium enters in compressor.In mud freezing container, mud is through repeatedly freeze-thaw (thaw and can naturally thaw), destroy the structure of mud, mud through thawing enters filter-pressing device, mud is pressed into bulk pie mud by filter-pressing device, send into shredder assembly again and carry out fragmentation formation mud granule, mud granule carries out drying in drying installation, achieves the stage process of mud.Owing to adding chemicals without in mud, therefore treating processes can not increase mud handling capacity, and the recycle of working medium energy substantially increases the freezing efficiency of mud; Only need by spending a small amount of compressor energy, working medium can will be several times as much as the heat " carrying " of energy consumption of compressor in loft drier in freezing container, realize the freezing of mud and drying sludge simultaneously, namely the cold source of freezing needs is solved, solve again the dry origin of heat needed, make cold and heat reach an extraordinary balance, substantially increase heat service efficiency, energy-saving effect is obvious; Heat in waste heat boiler is recovered thawing and the drying of mud granule for mud, improves capacity usage ratio further.
As preferably, 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, and thawing time is 3 to 9 hours, and freeze-thaw hockets 3-5 time repeatedly.
As preferably, in step 2) in, filter-pressing device is plate-and-frame filter press, 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, and time of filter pressing is 1.5-2 hour, now moisture percentage in sewage sludge 65%-70%, enter into the press dewatering stage again, squeeze pressure is 1.5Mpa, and the squeezing time is 1 hour, and now moisture percentage in sewage sludge is about 60%-65%.
As preferably, in step 4) in, drying installation is Multi-layer panel-turnover, mud granule is fully contacted with air, and be evenly distributed, time of drying is 1 hour, drying temperature 60-100 DEG C, 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 and carry out drying to mud granule, part high temperature air to thaw process to freezing mud simultaneously.
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 multiple, First Heat Exchanger and mud freezing container one_to_one corresponding, the two ends of the First Heat Exchanger in multiple mud freezing container are connected with vaporizer and compressor respectively by working medium reversing valve, the bottom of mud freezing container is provided with filtration, and the bottom of multiple mud freezing container is passed through liquid reversing valve and is communicated with filter-pressing device through fluid pipeline.Like this, the mud in a mud freezing container carry out freezing when, the mud of partial sludge freezing container carries out nature and thaws, and what thawed is then directly delivered in filter-pressing device, thus improve processing efficiency, can continuous seepage be carried out.
As preferably, described drying installation comprises loft drier and mud panel turnover mechanism, described mud panel turnover mechanism, on the vertical height of the difference of horizontal arrangement 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 the mud panel turnover mechanism the superiors are fallen into, along with the transmission of 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, warm air can be realized contact up and down with mud, omnibearing drying, 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 process.
As preferably, described filter-pressing device is plate-and-frame filter press, plate-and-frame filter press comprises multiple sheet frame, drawing-plate mechanism is provided with below sheet frame, described drawing-plate mechanism comprises polylith guiding piece and slide plate, is provided with articulated linkage, and is equipped with roller between adjacent two pieces of guiding pieces under every block guiding piece, described polylith guiding piece is placed on slide plate, and can be rolled with slide plate by roller and be connected.Like this, carry out pull by polylith drawing-plate mechanism, the pull of multiple sheet frame can be realized, solve current can only the problem of simultaneously pull one piece of sheet frame, shorten the arm-tie time, improve 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 the FB(flow block) adopting the present invention to carry out 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, 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, the energy-saving sewage sludge method for innocent treatment of one of the present invention, comprises the following steps:
1) mud in mud freezing container is carried out lasting freezing by lyophilize Power Cycle, continue freezing rear mud to be thawed, repeated multiple times freeze-thaw like this, this step is based on drying installation 3 and lyophilize Power Cycle, described lyophilize Power Cycle comprises compressor 5, vaporizer 6, condenser 7 and the First Heat Exchanger 8 be arranged 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 through the inlet end of First Heat Exchanger 8 with compressor 5, described condenser 7 is connected with bottom drying installation 3 by gas pipeline 10, and vaporizer 6 is connected with drying installation 3 top with by gas pipeline 10, and the condenser 7 is simultaneously connected by gas pipeline 10 with vaporizer 6,
2) in filter-pressing device, the mud after terminating through freeze-thaw process is dewatered, point press filtration stage and press dewatering stage, make mud be become the bulk mud cake shape mud of low-water-content by press filtration;
3) bulk mud cake shape mud carries out fragmentation in shredder assembly, forms little mud granule;
4) delivered in sludge drying mechanism by the mud granule after fragmentation and carry out drying, by lyophilize Power Cycle by condenser heat rejection, transfer heat to air, warm air enters sludge drying mechanism and carries out drying to mud granule.
5) dried mud granule is admitted in incinerator and burns, burn the high-temperature flue gas produced 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 to be continued to absorb heat, form high temperature air, high temperature air is after blower fan pressurization, enter drying installation and mud freezing container respectively by hot gas duct, thus the heat in waste heat boiler is used for mud and thaws and the drying of mud granule; This step is based on waste-heat recovery device, the heat-conducting oil pipes 18 that waste-heat recovery device comprises waste heat boiler 17 and is arranged in waste heat boiler 17, heat-conducting oil pipes 18 is provided with in described waste heat boiler 17, heat-conducting oil pipes 18 and air carry out heat trnasfer to air heating, air after heating is inputted drying installation 3 and mud freezing container 4 respectively, for mud drying and thaw.
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, and 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, carry out mechanical dehydration, be first the press filtration stage, and press filtration pressure is 1.0-1.2Mpa, time of filter pressing is 1.5-2 hour, now moisture percentage in sewage sludge 65%-70%, then enter into the press dewatering stage, squeeze pressure is 1.5Mpa, the squeezing time is 1 hour, and now moisture percentage in sewage sludge is about 60%-65%.
In step 4) in, drying installation is Multi-layer panel-turnover, and mud granule is fully contacted with air, and be evenly distributed, time of drying is 1 hour, drying temperature 60-100 DEG C, and after super-dry, the water ratio of mud is 10%-20%, now vaporizer provides cold to mud freezing container, condenser to air heating, then through the heat exchange again of the second interchanger, forms high temperature air, enter drying installation and carry out drying to mud granule, part high temperature air to thaw process to freezing mud simultaneously.
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, break process is carried out by shredder assembly 2 after filter-pressing device 1 pair of mud carries out press filtration process, enter drying installation 3 after sludge crushing and carry out drying treatment, dried mud granule is sent in incinerator 16 and is burned (entering incinerator by transfer mechanism 23 from the feed opening of drying installation), burns the high-temperature flue gas produced and enters waste heat boiler 17.
Described mud freezing container 4 is multiple, First Heat Exchanger 8 and mud freezing container 4 one_to_one corresponding, the two ends of the First Heat Exchanger 8 in multiple mud freezing container 4 are connected with vaporizer 6 and compressor 5 respectively by working medium reversing valve 11, the bottom of mud freezing container 4 is provided with filtration 12, and the bottom of multiple mud freezing container 4 is by liquid reversing valve 13 and be communicated with filter-pressing device 1 through fluid pipeline 14; Mud after thawing is pumped into filter-pressing device 1 from mud freezing container 4 by rotor pump 15.
Described drying installation 3 comprises loft drier 3.1 and mud panel turnover mechanism 3.2, described mud panel turnover mechanism, on the vertical height of the difference of horizontal arrangement in loft drier 3.1, described sludge turning trigger 3.2 structure is 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 multiple sheet frame 1.1, drawing-plate mechanism is provided with below sheet frame 1.1, described drawing-plate mechanism comprises polylith guiding piece 1.2 and slide plate 1.3, articulated linkage 1.4 is provided with between adjacent two pieces of guiding pieces 1.2, and being equipped with roller 1.5 1.2 times at every block guiding piece, described polylith guiding piece 1.2 is placed on slide plate 1.3, and can be rolled with slide plate 1.3 by roller 1.5 and be connected.
Sludge deep treatment process design parameter (parameter designing can make scheme optimization) flow process is:
1) freezing temp-10 DEG C ~-15 DEG C, freezing time 72 little carry out repeatedly at present freezing;
2) carry out between 20-50 DEG C thaw (can adopt normal temperature unfreezing), thawing time is about 6 hours;
3) in plate-and-frame filter press, mechanical dehydration is carried out, first it is the press filtration stage, press filtration pressure is 1.0-1.2Mpa, time of filter pressing is 1.5-2 hour, now moisture percentage in sewage sludge 65%-70%, then enter into the press dewatering stage, squeeze pressure is 1.5Mpa, the squeezing time is 1 hour, and now moisture percentage in sewage sludge is about 60%-65%;
4) plate-and-frame filter press bulk mud cake shape mud is out carried out fragmentation in mud mixing shredder assembly, form little mud granule, mud granule size is generally at about 20mm;
5) mud after fragmentation is delivered in drying installation carry out drying, drying installation is Multi-layer panel-turnover, and time of drying is 1 hour, drying temperature 60-100 DEG C, 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 to burn, 850 DEG C 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 about 250 DEG C, and thermal oil enters into the second interchanger and transfers heat to air, heat air, the air after heating enters in drying installation and carries out drying to mud;
8) smoke eliminator that Heat Treatment device gas outlet is arranged removes sour gas and the trapping of particulate matter, makes the flue gas of discharge air meet environmental requirement.
Specific works principle is as follows:
Mud enters into mud freezing container, first under First Heat Exchanger effect, refrigeration working medium enters in First Heat Exchanger, working medium is absorbed heat to mud, the freezing temp of mud is made to reach specified temperature, mud-10 DEG C ~-15 DEG C, freezing time 72 is little at present through repeatedly freezing, destroy the bonding force of mud and water and destroy the structure of colloid, elimination of colloid stability is condensed 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 working medium and commutates, and by working medium flow-reversal in another mud freezing container, passes into the air with certain temperature and thaw in now freezing mud freezing container, air themperature is between 20-50 DEG C, and thawing time is 6 hours.
Fluid pipeline is passed through after mud thaws, enter rotor pump, enter board and frame machine (plate-and-frame filter press) and start press filtration in the pressure that adds of rotor pump 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, crusher is transported to through device for transporting objects, crusher carries out fragmentation to mud cake, form little mud granule, mud granule size remains on about 20mm, short grained mud is become to improve the specific surface area of mud, be beneficial to the contact area increasing mud and high temperature air in drying, 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 dropped, mud can constantly overturn, and each surface is all fully contacted with air.Dry air contacts with mud from bottom to top, the wet air that the moisture of absorption of air mud becomes humidity very high drops to below dew point after evaporator, separate out moisture, the moisture of separating out is discharged through water accumulating disc, heated after air continues through condenser, enter in loft drier and drying is carried out to mud.Mud is left loft drier by after heat drying after basecoat turnover panel.
Mud is transported to incinerator by device for transporting objects after leaving loft drier, regulate the First air entering combustion chamber, under refiner effect, make it be in fluidized bed combustion state, because the medium in fluidized-bed is in suspended state, gas-solid fully can mix contact, the temperature of whole stove combustion section is comparatively even, and the waste gas about 850 DEG C of discharges produced after burning enter into waste heat boiler.Meanwhile, the thermal oil in waste heat boiler is heated to 250 DEG C by 220 DEG C, is heated by the second interchanger by the thermal oil after heating to air, and the air after heating enters into dehumidification system and thawing apparatus to drying sludge and heat supply of thawing.Gas-cleaning installation is made up of with particle collection two parts removing 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 reach spray-dired reaction process by spraying plant control moisture.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, objectionable impurities such as absorption heavy metal in flue gas and Dioxins etc.Can discharge air through purified gas, 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 changes done 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) mud in mud freezing container is carried out lasting freezing by lyophilize Power Cycle, continue freezing rear mud to be thawed, repeated multiple times freeze-thaw like this, this step is based on drying installation (3) and lyophilize Power Cycle, described lyophilize Power Cycle comprises compressor (5), vaporizer (6), condenser (7) and the First Heat Exchanger (8) be arranged in mud freezing container (4), the outlet side of compressor (5) is connected with condenser (7), condenser (7) is connected with vaporizer (6) through throttling element (9), vaporizer (6) is connected through the inlet end of First Heat Exchanger (8) with compressor (5), 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 the condenser (7) is simultaneously connected by gas pipeline (10) with vaporizer (6),
2) in filter-pressing device, the mud after terminating through freeze-thaw process is dewatered, point press filtration stage and press dewatering stage, make mud be become the bulk mud cake shape mud of low-water-content by press filtration;
3) bulk mud cake shape mud carries out fragmentation in shredder assembly, forms little mud granule;
4) delivered in drying installation by the mud granule after fragmentation and carry out drying, by lyophilize Power Cycle by condenser heat rejection, transfer heat to air, warm air enters drying installation and carries out drying to mud granule;
5) dried mud granule is admitted in incinerator and burns, burn the high-temperature flue gas produced 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 to be continued to absorb heat, form high temperature air, high temperature air is after blower fan pressurization, enter drying installation and mud freezing container respectively by hot gas duct, thus the heat in waste heat boiler is used for mud and thaws and the drying of mud granule; 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), heat-conducting oil pipes (18) is provided with in described waste heat boiler (17), heat-conducting oil pipes (18) and air carry out heat trnasfer to air heating, air after heating is inputted drying installation (3) and mud freezing container (4) respectively, for mud drying and thaw.
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, 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, and time of filter pressing is 1.5-2 hour, now moisture percentage in sewage sludge 65%-70%, enter into the press dewatering stage again, squeeze pressure is 1.5Mpa, and the squeezing time is 1 hour, now moisture percentage in sewage sludge 60%-65%.
4. the energy-saving sewage sludge method for innocent treatment according to 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, time of drying is 1 hour, drying temperature 60-100 DEG C, 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, enter drying installation and drying is carried out to mud granule, part high temperature air to thaw process to freezing mud simultaneously.
5. the energy-saving sewage sludge method for innocent treatment according to 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 multiple, First Heat Exchanger (8) and mud freezing container (4) one_to_one corresponding, the two ends of the First Heat Exchanger (8) in multiple mud freezing container (4) are connected with vaporizer (6) and compressor (5) respectively by working medium reversing valve (11), the bottom of mud freezing container (4) is provided with filtration (12), the bottom of multiple mud freezing container (4) is passed through liquid reversing valve (13) and is communicated with filter-pressing device (1) through fluid pipeline (14), mud after thawing is pumped into filter-pressing device (1) from mud freezing container (4) by rotor pump (15).
7. energy-saving sewage sludge method for innocent treatment 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, on the vertical height of difference of horizontal arrangement 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 loft drier (3.1) outward.
8. energy-saving sewage sludge method for innocent treatment 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 multiple sheet frame (1.1), drawing-plate mechanism is provided with in sheet frame (1.1) below, described drawing-plate mechanism comprises polylith guiding piece (1.2) and slide plate (1.3), articulated linkage (1.4) is provided with between adjacent two pieces of guiding pieces (1.2), and roller (1.5) is equipped with under every block guiding piece (1.2), described polylith guiding piece (1.2) is placed on slide plate (1.3), and can roll with slide plate (1.3) be connected by roller (1.5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410381267.XA CN104140188B (en) | 2014-08-04 | 2014-08-04 | Energy-saving sewage sludge method for innocent treatment |
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| CN105000775A (en) * | 2015-06-19 | 2015-10-28 | 广州中科建禹环保有限公司 | Deep dewatering system and method for sludge |
| CN109141064A (en) * | 2017-06-15 | 2019-01-04 | 广州新致晟环保科技有限公司 | Tail gas clean-up and heat recovery system and method for Treatment of Sludge |
| CN111018304A (en) * | 2019-12-23 | 2020-04-17 | 广东工业大学 | Energy-saving sludge drying treatment system |
| CN111747623A (en) * | 2020-06-19 | 2020-10-09 | 新疆博云时代环保科技有限公司 | Integrated treatment process for oily sludge |
| CN112128778A (en) * | 2020-08-14 | 2020-12-25 | 安吉临港热电有限公司 | Dust-free sludge incineration device and incineration process thereof |
| CN112661387A (en) * | 2020-12-08 | 2021-04-16 | 上海市地矿建设有限责任公司 | Freeze-thawing-grading vacuum preloading sludge treatment device and treatment method |
| CN113087337B (en) * | 2021-04-06 | 2022-03-08 | 深圳市捷晶能源科技有限公司 | Sludge treatment system |
| CN114751618A (en) * | 2022-02-25 | 2022-07-15 | 上海固雅环境科技有限公司 | Sludge low-temperature drying system and drying method |
| CN114716124B (en) * | 2022-05-10 | 2023-12-05 | 江苏道科环境科技有限公司 | Freeze thawing ultrasonic combined sludge high-dry dehydration system and method |
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| US5357881A (en) * | 1993-02-09 | 1994-10-25 | Northrop Engineering Corporation | Combined positive controlled sludge dryer and burner |
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