CN115849650A - Municipal sludge treatment method - Google Patents
Municipal sludge treatment method Download PDFInfo
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- CN115849650A CN115849650A CN202310213838.8A CN202310213838A CN115849650A CN 115849650 A CN115849650 A CN 115849650A CN 202310213838 A CN202310213838 A CN 202310213838A CN 115849650 A CN115849650 A CN 115849650A
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- 239000010802 sludge Substances 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000007789 gas Substances 0.000 claims abstract description 90
- 231100000331 toxic Toxicity 0.000 claims abstract description 26
- 230000002588 toxic effect Effects 0.000 claims abstract description 26
- 239000002893 slag Substances 0.000 claims abstract description 15
- 238000000197 pyrolysis Methods 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 238000004321 preservation Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 27
- 239000011499 joint compound Substances 0.000 claims description 24
- 238000000926 separation method Methods 0.000 claims description 22
- 238000002156 mixing Methods 0.000 claims description 19
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000001723 curing Methods 0.000 claims description 10
- 238000002309 gasification Methods 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 10
- 239000004579 marble Substances 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000000292 calcium oxide Substances 0.000 claims description 7
- 235000012255 calcium oxide Nutrition 0.000 claims description 7
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 6
- 230000002745 absorbent Effects 0.000 claims description 6
- 239000002250 absorbent Substances 0.000 claims description 6
- 230000001877 deodorizing effect Effects 0.000 claims description 6
- 230000000844 anti-bacterial effect Effects 0.000 claims description 5
- 239000003899 bactericide agent Substances 0.000 claims description 5
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 5
- 239000000920 calcium hydroxide Substances 0.000 claims description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 5
- 239000005997 Calcium carbide Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 4
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 230000032683 aging Effects 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 239000003206 sterilizing agent Substances 0.000 claims 1
- 239000013585 weight reducing agent Substances 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 7
- 241000700605 Viruses Species 0.000 abstract description 4
- 244000052616 bacterial pathogen Species 0.000 abstract description 4
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 abstract description 3
- 239000002781 deodorant agent Substances 0.000 abstract description 3
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 3
- 230000001954 sterilising effect Effects 0.000 abstract description 3
- 238000004659 sterilization and disinfection Methods 0.000 abstract description 3
- 238000005979 thermal decomposition reaction Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 238000004062 sedimentation Methods 0.000 description 16
- 238000012360 testing method Methods 0.000 description 10
- 238000004458 analytical method Methods 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 8
- 238000003556 assay Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a municipal sludge treatment method, and relates to the field of environmental protection. The invention adds the sterilization deodorant into the sludge, so that virus and germs are killed, and simultaneously, substances generating odor are decomposed, thereby reducing the volatilization of the odor; by adding the curing agent, the generated toxic and harmful gas is cured; in the thermal decomposition process, the generated dioxin substances are decomposed and the toxic and harmful gases are solidified through secondary heat preservation and pressure maintaining; a small amount of non-solidified toxic and harmful gas can be sprayed and absorbed, so that the toxic and harmful gas is prevented from entering the environment and polluting the atmosphere; finally obtaining sludge slag with the weight reduction ratio of more than 90% at the bottom of the pyrolysis gasifier; the method has the advantages of low cost, simple process, high efficiency and easy large-scale production.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a municipal sludge treatment method.
Background
The sludge is the bottom sediment generated in the wastewater treatment process, the composition is generally complex, and the municipal sludge contains various pathogenic bacteria, various viruses, various inorganic substances and a large amount of organic substances and can cause great pollution to the environment when being directly discharged. At present, municipal sludge is generally treated by the modes of firstly dehydrating, drying, recycling, isolating, burying, harmlessly burning and the like. Municipal sludge is easy to appear in the treatment process, the odor of an operation site is large, virus and germs are easy to infect operators, the occupied area is large, and sulfur dioxide, oxynitride and dioxin substances are easy to be discharged in the incineration process. The treatment of municipal sludge is always a difficult problem, and the problem to be solved by the invention is how to fully utilize the resource. Therefore, the research on a new municipal sludge treatment method has great significance.
Disclosure of Invention
In order to solve the technical problems, the invention provides the municipal sludge treatment method which is low in cost, simple to operate, high in resource utilization rate, free of odor release, large in weight reduction and easy for large-scale production.
In order to achieve the purpose, the invention provides the following technical scheme:
(1) Adding a curing agent and a deodorizing bactericide into the municipal sludge obtained by precipitation, stirring and curing to obtain premixed sludge;
(2) Pumping the premixed sludge into a rotational flow thermal vibration dryer, and obtaining dry sludge premixed material with the water content of 8-12% after thermal conduction preheating and high-speed hot air convection drying;
(3) The hot air at a certain speed carries the dry sludge premix to enter a cyclone separator to realize gas-solid separation to obtain dry sludge and mixed gas, the mixed gas is subjected to liquid-vapor separation to obtain hot air and water, the water enters a hot water pipe network system, and the hot air is mixed and then enters an incinerator;
(4) And conveying the dry sludge to a sludge storage bin through a conveying belt.
(5) Metering the dry sludge, feeding the dry sludge into a pyrolysis gasification furnace, sealing, heating to a certain temperature, pressurizing, preserving heat and pressure, cooling, preserving heat and pressure, and finally gasifying most of the dry sludge into mixed gas of various combustible gases and residual sludge slag below;
(6) And (3) spraying and absorbing the mixed gas by using an absorbent to remove toxic and harmful gases, mixing the residual combustible gas with the hot air in the step (3) and then feeding the mixed gas into an incinerator, using the generated heat for heating in the step (2), and feeding the mixed hot air into a hot air circulating system.
In the above municipal sludge treatment method, preferably, in the step (1), the weight ratio of the municipal sludge, the curing agent and the deodorizing bactericide in a dry state is 50-80:2-4:1-2, preferably 70:3:1.4; the curing agent is one or two of papermaking white mud and saw mud of marble production enterprises, preferably the weight ratio of the papermaking white mud to the saw mud of the marble production enterprises is 1: 1; the deodorizing bactericide is one or more of calcium carbide mud, quicklime and sodium hydroxide of polyvinyl chloride production enterprises, and preferably quicklime; the time taken for stirring and aging is 18 to 36 hours, preferably 28 hours.
In the above municipal sludge treatment method, preferably, in the step (2), the heat conduction is heat conduction oil or steam, preferably steam; the temperature of the high-speed hot air is 80-140 ℃, preferably 110 ℃, and the speed of the hot air is 420-960m/s, preferably 720m/s.
In the municipal sludge treatment method, preferably, in the step (3), the wind speed of the hot wind is 28-54m/s, preferably 42m/s, and the hot air obtained after liquid-vapor separation enters the incinerator.
In the municipal sludge treatment method, preferably, in the step (5), the temperature rise to a certain temperature is 480-780 ℃, preferably 620 ℃, the pressure for pressurization is 0.6-1.2MPa, preferably 0.9MPa, and the time for heat preservation and pressure maintaining is 2.5-4.0 hours, preferably 3.2 hours; the temperature reduction is 280-420 ℃, and is preferably 360 ℃; the pressure maintaining time is 1.0-2.4 hours, preferably 1.8 hours;
in the above municipal sludge treatment method, preferably, in step (6), the absorbent is a solution formed by one or more of sodium hydroxide, calcium hydroxide, sodium carbonate and sodium bicarbonate, preferably sodium hydroxide; the concentration of the absorbent is 1-3%, preferably 1.6%; the volume mixing ratio of the combustible gas to the hot air in the step (3) is 1:3-5, preferably 1:4.2;
in the above municipal sludge treatment method, preferably, the weight ratio is a dry weight ratio after conversion.
The invention has the beneficial effects that:
the invention adds the sterilization deodorant into the sludge, so that virus and germs are killed, and simultaneously, substances generating odor are decomposed, thereby reducing the volatilization of the odor; by adding the curing agent, the generated toxic and harmful gas is cured; in the thermal decomposition process, the generated dioxin substances are decomposed and the toxic and harmful gases are solidified through secondary heat preservation and pressure maintaining; a small amount of non-solidified toxic and harmful gas can be sprayed and absorbed, so that the toxic and harmful gas is prevented from entering the environment and polluting the atmosphere; finally obtaining sludge slag with the weight reduction ratio of more than 90% at the bottom of the pyrolysis gasifier; the method has the advantages of low cost, simple process, high efficiency and easy large-scale production.
Drawings
FIG. 1 is a process flow diagram of an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is clearly and completely described in the following embodiments, wherein the mass of the furnace bottom slag refers to the mass of the furnace bottom slag of the pyrolysis gasifier, and the mass of the sludge slag refers to the sum of the mass of the curing agent and the mass of the sterilization deodorant added during pretreatment.
Example 1, (1) the untreated municipal sludge in the sedimentation tank No. 1 was converted into 25 tons through assay analysis, 0.35 tons of white mud from paper-making enterprises in Shandong and 0.18 tons of calcium carbide mud from polychloroacetylene manufacturing enterprises in Shandong, mixed in the sedimentation tank, stirred and aged for 24 hours;
(2) Pumping the premixed sludge into a rotational flow heat vibration drying machine, adopting heat steam conduction for preheating, adjusting the temperature of heat convection hot air to be 120 ℃, adjusting the air speed to be 600m/s, and testing to obtain dry sludge premixed material with the water content of 11%;
(3) Carrying the dry sludge premix into a cyclone separator through 40m/s hot air to realize gas-solid separation to obtain dry sludge and mixed gas, carrying the mixed gas through liquid-vapor separation to obtain hot air and water, feeding the water into a hot water pipe network system, and feeding the hot air into an incinerator after mixing;
(4) Conveying the dry sludge to a No. 1 sludge storage bin through a conveyer belt, and collecting 20 tons of dry sludge for later use;
(5) Feeding the 20 tons of dry sludge into a pyrolysis gasification furnace, sealing, rapidly heating to 620 ℃, then starting pressurizing to 0.9MPa, preserving heat and maintaining pressure for 3.2 hours, cooling to 360 ℃, preserving heat and maintaining pressure for 1.8 hours, finally gasifying the sludge into mixed gas containing combustible gas and a small amount of toxic and harmful gas and 1.89 tons of sludge slag at the bottom of the furnace after conversion, wherein the weight reduction ratio is 90.5%;
(6) And (3) spraying and absorbing the mixed gas by using a 1.5% sodium hydroxide aqueous solution to remove toxic and harmful gases, wherein the volume ratio of the residual combustible gas to the hot air in the step (3) is 1:4.2, mixing, then burning in an incinerator, using the generated heat for heating in the step (2), and feeding the hot air into a hot air circulating system.
Example 2, (1) untreated municipal sludge in the sedimentation tank No. 1 was converted into 42 tons through assay analysis, 1.05 tons of white mud from paper-making enterprises in Shandong and 0.0.52 ton of quick lime, mixed in the sedimentation tank, stirred and aged for 36 hours;
(2) Pumping the premixed sludge into a rotational flow thermal vibration drying machine, adopting thermal steam conduction for preheating, adjusting the temperature of thermal convection hot air to be 110 ℃, and the air speed to be 720m/s, and testing to obtain dry sludge premixed material with the water content of 10%;
(3) Carrying the dry sludge premix into a cyclone separator through hot air of 28m/s to realize gas-solid separation to obtain dry sludge and mixed gas, carrying the mixed gas through liquid-vapor separation to obtain hot air and water, feeding the water into a hot water pipe network system, and feeding the hot air into an incinerator after mixing;
(4) Conveying the dry sludge to a No. 2 sludge storage bin through a conveyer belt, and collecting 32 tons of dry sludge for later use;
(5) Feeding the 32 tons of dry sludge into a pyrolysis gasification furnace, sealing, rapidly heating to 780 ℃, then starting pressurizing to 0.8MPa, preserving heat and maintaining pressure for 4 hours, cooling to 300 ℃, preserving heat and maintaining pressure for 2 hours, finally gasifying the sludge into a mixed gas containing combustible gas and a small amount of toxic and harmful gas and 2.88 tons of sludge slag at the bottom of the furnace after conversion, wherein the weight reduction ratio is 91.0%;
(6) And (3) spraying and absorbing the mixed gas by using 1.5% of calcium hydroxide aqueous solution to remove toxic and harmful gases, wherein the volume ratio of the residual combustible gas to the hot air in the step (3) is 1:3, mixing and then burning in an incinerator, using the generated heat for heating in the step (2), and enabling the burnt mixed hot air to enter a hot air circulating system.
Example 3, the untreated municipal sludge in the sedimentation tank (1) No. 3 is converted into 36 tons of papermaking white mud of certain papermaking enterprises in Shandong and sawing mud of certain marble production enterprises in Shandong after test analysis, and the weight ratio of the papermaking white mud to the sawing mud of the certain marble production enterprises in Shandong is 1: 1.44 tons of the mixture and 0.72 tons of quicklime are mixed in a sedimentation tank, stirred and aged for 24 hours;
(2) Pumping the premixed sludge into a rotational flow thermal vibration drying machine, adopting oil conduction heating, adjusting the temperature of thermal convection hot air to be 95 ℃, adjusting the air speed to be 470m/s, and testing to obtain dry sludge premix with the water content of 8.7%;
(3) Carrying the dry sludge premix by hot air of 28m/s to enter a cyclone separator to realize gas-solid separation to obtain dry sludge and mixed gas, carrying the mixed gas by liquid-vapor separation to obtain hot air and water, introducing the water into a hot water pipe network system, and mixing the hot air and the hot air to enter an incinerator;
(4) Conveying the dry sludge to a No. 3 sludge storage bin through a conveyer belt, and collecting 24 tons of dry sludge for later use;
(5) Feeding the 24 tons of dry sludge into a pyrolysis gasification furnace, sealing, rapidly heating to 520 ℃, then starting pressurizing to 0.72MPa, preserving heat and maintaining pressure for 4.0 hours, cooling to 420 ℃, preserving heat and maintaining pressure for 1.0 hour, and finally gasifying the sludge into a mixed gas containing combustible gas and a small amount of toxic and harmful gas and 2.14 tons of sludge slag at the bottom of the furnace, wherein the weight reduction ratio is 90.9%;
(6) And (3) spraying and absorbing the mixed gas by using 1% of calcium hydroxide aqueous solution to remove toxic and harmful gases, wherein the volume ratio of the residual combustible gas to the hot air in the step (3) is 1:5, mixing and then burning in an incinerator, using the generated heat for heating in the step (2), and enabling the burnt mixed hot air to enter a hot air circulating system.
Example 4, (1) the untreated municipal sludge in the sedimentation tank No. 2 was converted into 45 tons by assay analysis, 3.6 tons of sawn mud from marble manufacturers in Shandong, and 0.9 ton of sodium hydroxide, mixed in the sedimentation tank, stirred and aged for 24 hours;
(2) Pumping the premixed sludge into a rotational flow thermal vibration drying machine, adopting thermal steam conduction heating, adjusting the temperature of thermal convection hot air to be 132 ℃, adjusting the air speed to be 720m/s, and testing to obtain dry sludge premixed material with the water content of 9.6%;
(3) Carrying the dry sludge premix into a cyclone separator through hot air of 46m/s to realize gas-solid separation to obtain dry sludge and mixed gas, carrying the mixed gas through liquid-vapor separation to obtain hot air and water, feeding the water into a hot water pipe network system, and feeding the hot air into an incinerator after mixing;
(4) Conveying the dry sludge to a No. 1 sludge storage bin through a conveyer belt, and collecting 20 tons of dry sludge for later use;
(5) Feeding the 20 tons of dry sludge into a pyrolysis gasification furnace, sealing, rapidly heating to 540 ℃, then starting pressurizing to 1.12MPa, preserving heat and maintaining pressure for 2.8 hours, cooling to 292 ℃, preserving heat and maintaining pressure for 2.4 hours, and finally gasifying the sludge into mixed gas containing combustible gas and a small amount of toxic and harmful gas and 1.76 tons of sludge slag at the bottom of the furnace, wherein the weight reduction ratio is 92.0%;
(6) And (3) spraying and absorbing the mixed gas by using a 1.2% sodium carbonate aqueous solution to remove toxic and harmful gases, wherein the volume ratio of the residual combustible gas to the hot air in the step (3) is 1:3.6 the mixture enters an incinerator for incineration, the generated heat is used for heating in the step (2), and the combusted mixed hot air enters a hot air circulating system.
Example 5, (1) the untreated municipal sludge in the sedimentation tank No. 3 was converted into 32 tons through assay analysis, 2.6 tons of white mud from paper-making enterprises in Shandong and 0.18 ton of calcium carbide mud from polychloroacetylene manufacturing enterprises in Shandong, mixed in the sedimentation tank, stirred and aged for 24 hours;
(2) Pumping the premixed sludge into a rotational flow thermal vibration drying machine, adopting thermal steam conduction heating, adjusting the temperature of thermal convection hot air to be 112 ℃, adjusting the air speed to be 460m/s, and testing to obtain dry sludge premixed material with the water content of 9.4%;
(3) Carrying the dry sludge premix into a cyclone separator through 52m/s hot air to realize gas-solid separation to obtain dry sludge and mixed gas, carrying the mixed gas through liquid-vapor separation to obtain hot air and water, feeding the water into a hot water pipe network system, and feeding the hot air into an incinerator after mixing;
(4) Conveying the dry sludge to a No. 2 sludge storage bin through a conveying belt, and collecting 28 tons of dry sludge for later use;
(5) Feeding the 28 tons of dry sludge into a pyrolysis gasification furnace, sealing, rapidly heating to 760 ℃, then starting pressurizing to 0.62MPa, preserving heat and maintaining pressure for 3.8 hours, cooling to 400 ℃, preserving heat and maintaining pressure for 2.4 hours, and finally gasifying the sludge into a mixed gas containing combustible gas and a small amount of toxic and harmful gas and 2.52 tons of sludge slag at the bottom of the furnace, wherein the weight reduction ratio is 91.0%;
(6) And (4) spraying and absorbing the mixed gas by using a 2.8% sodium bicarbonate aqueous solution to remove toxic and harmful gases, wherein the volume ratio of the residual combustible gas to the hot air in the step (3) is 1:3.6 the mixture enters an incinerator for incineration, the generated heat is used for heating in the step (2), and the combusted mixed hot air enters a hot air circulating system.
Example 6, the untreated municipal sludge in the sedimentation tank No. 2 (1) is converted into 36 tons of papermaking white mud of a papermaking enterprise of a certain papermaking enterprise in Shandong and saw mud of a certain marble production enterprise in Shandong after test analysis, and the weight ratio of the papermaking white mud to the saw mud of the certain marble production enterprise in Shandong is 1: 1.54 tons of the mixture and 0.78 tons of quicklime are mixed in a sedimentation tank, stirred and aged for 24 hours;
(2) Pumping the premixed sludge into a rotational flow thermal vibration dryer, heating by adopting thermal steam conduction, adjusting the temperature of thermal convection hot air to 85 ℃, and the air speed to 490m/s, and testing to obtain dry sludge premixed material with the water content of 10.7%;
(3) Carrying the dry sludge premix by hot air of 54m/s to enter a cyclone separator to realize gas-solid separation to obtain dry sludge and mixed gas, carrying the mixed gas by liquid-vapor separation to obtain hot air and water, introducing the water into a hot water pipe network system, and mixing the hot air and the hot air to enter an incinerator;
(4) Conveying the dry sludge to a No. 1 sludge storage bin through a conveyer belt, and collecting 20 tons of dry sludge for later use;
(5) Feeding the 20 tons of dry sludge into a pyrolysis gasification furnace, sealing, rapidly heating to 740 ℃, then starting pressurizing to 0.84MPa, preserving heat and maintaining pressure for 2.5 hours, cooling to 320 ℃, preserving heat and maintaining pressure for 2.4 hours, and finally gasifying the sludge into mixed gas containing combustible gas and a small amount of toxic and harmful gas and 1.82 tons of sludge slag at the bottom of the furnace, wherein the weight reduction ratio is 90.9%;
(6) Mixing the mixed gas in a mass ratio of 1:1, spraying and absorbing 1.1% aqueous solution of a mixture of sodium hydroxide and calcium hydroxide to remove toxic and harmful gases, wherein the volume ratio of the residual combustible gases to the hot air in the step (3) is 1:3.4, mixing, then burning in an incinerator, using the generated heat for heating in the step (2), and feeding the hot air into a hot air circulating system.
Example 7, (1) the untreated municipal sludge in the sedimentation tank No. 2 was converted into 42 tons by assay analysis, 1.60 tons of white mud from paper-making enterprises in Shandong and 0.6 ton of sodium hydroxide, mixed in the sedimentation tank, stirred and aged for 32 hours;
(2) Pumping the premixed sludge into a rotational flow thermal vibration dryer, heating by adopting thermal steam conduction, adjusting the temperature of thermal convection hot air to be 112 ℃, adjusting the air speed to be 600m/s, and testing to obtain dry sludge premix with the water content of 9.3%;
(3) Carrying the dry sludge premix into a cyclone separator through 38m/s hot air to realize gas-solid separation to obtain dry sludge and mixed gas, carrying the mixed gas through liquid-vapor separation to obtain hot air and water, feeding the water into a hot water pipe network system, and feeding the hot air into an incinerator after mixing;
(4) Conveying the dry sludge to a No. 2 sludge storage bin through a conveying belt, and collecting 28 tons of dry sludge for later use;
(5) Feeding the 28 tons of dry sludge into a pyrolysis gasification furnace, sealing, rapidly heating to 740 ℃, then starting pressurizing to 1.1MPa, preserving heat and maintaining pressure for 2.8 hours, cooling to 320 ℃, preserving heat and maintaining pressure for 1.8 hours, and finally gasifying the sludge into a mixed gas containing combustible gas and a small amount of toxic and harmful gas and 2.45 tons of sludge slag at the bottom of the furnace, wherein the weight reduction ratio is 92.5%;
(6) And (4) spraying and absorbing the mixed gas by using a 3% sodium bicarbonate aqueous solution to remove toxic and harmful gases, wherein the volume ratio of the residual combustible gases to the hot air in the step (3) is 1:4.8, mixing, then burning in an incinerator, using the generated heat for heating in the step (2), and feeding the hot air into a hot air circulating system.
Example 8, (1) untreated municipal sludge in the sedimentation tank No. 1 was converted into 25 tons by assay analysis, 1.5 tons of sawn mud and 1.0 ton of quick lime from marble manufacturers in Shandong, mixed in the sedimentation tank, stirred and aged for 18 hours;
(2) Pumping the premixed sludge into a rotational flow thermal vibration dryer, heating by adopting thermal steam conduction, adjusting the temperature of thermal convection hot air to be 96 ℃, adjusting the air speed to be 530m/s, and testing to obtain dry sludge premixed material with the water content of 10.7%;
(3) Carrying the dry sludge premix into a cyclone separator through 52m/s hot air to realize gas-solid separation to obtain dry sludge and mixed gas, carrying the mixed gas through liquid-vapor separation to obtain hot air and water, feeding the water into a hot water pipe network system, and feeding the hot air into an incinerator after mixing;
(4) Conveying the dry sludge to a No. 3 sludge storage bin through a conveyer belt, and collecting 32 tons of dry sludge for later use;
(5) Feeding the 32 tons of dry sludge into a pyrolysis gasification furnace, sealing, rapidly heating to 730 ℃, then starting pressurizing to 0.86MPa, preserving heat and maintaining pressure for 2.8 hours, cooling to 360 ℃, preserving heat and maintaining pressure for 1.2 hours, and finally gasifying the sludge into a mixed gas containing combustible gas and a small amount of toxic and harmful gas and 2.83 tons of sludge slag at the bottom of the furnace, wherein the weight reduction ratio is 91.5%;
(6) And (3) spraying and absorbing the mixed gas by using a 3% sodium carbonate aqueous solution to remove toxic and harmful gases, wherein the volume ratio of the residual combustible gas to the hot air in the step (3) is 1:3, mixing and then burning in an incinerator, using the generated heat for heating in the step (2), and enabling the burnt mixed hot air to enter a hot air circulating system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, as any improvements and modifications within the spirit and principle of the present invention should fall within the scope of the present invention.
Claims (7)
1. The municipal sludge treatment method is characterized by comprising the following steps:
(1) Adding a curing agent and a deodorizing bactericide into the municipal sludge obtained by precipitation, stirring and curing to obtain premixed sludge;
(2) Pumping the premixed sludge into a rotational flow thermal vibration drier, and obtaining dry sludge premixed material with the water content of 8-12% after thermal conduction preheating and hot air convection drying;
(3) Carrying the dry sludge premix with hot air to realize gas-solid separation to obtain dry sludge and mixed gas, carrying out liquid-vapor separation on the mixed gas to obtain hot air and water, feeding the water into a hot water pipe network system, and feeding the mixed hot air into an incinerator;
(4) Conveying the dry sludge to a sludge storage bin;
(5) Feeding the dry sludge into a pyrolysis gasification furnace, sealing, heating, pressurizing, preserving heat and pressure, cooling, preserving heat and pressure, and finally gasifying most of the dry sludge into mixed gas of multiple combustible gases and residual sludge slag below;
(6) And (3) spraying and absorbing the mixed gas by using an absorbent to remove toxic and harmful gases, mixing the residual combustible gas with the hot air in the step (3) and then feeding the mixed gas into an incinerator, using the generated heat for heating in the step (2), and feeding the mixed hot air into a hot air circulating system.
2. The method for treating the municipal sludge according to claim 1, wherein in the step (1), the weight ratio of the municipal sludge, the curing agent and the deodorizing and sterilizing agent in a dry state is 50-80:2-4:1-2; the curing agent is one or two of papermaking white mud and saw mud of marble production enterprises; the deodorizing bactericide is one or more of calcium carbide mud, quicklime and sodium hydroxide of polyvinyl chloride production enterprises; the time taken for stirring and aging is 18 to 36 hours.
3. The method for treating municipal sludge according to claim 1, wherein in the step (2), the heat conduction is heating with heat conduction oil or steam; the temperature of the hot air is 80-140 ℃, and the speed of the hot air is 420-960m/s.
4. The municipal sludge treatment method according to claim 1, wherein in the step (3), the wind speed of the hot wind is 28-54m/s, and the hot air obtained after the liquid-vapor separation is subjected to a heat convection circulation system.
5. The municipal sludge treatment method according to claim 1, wherein in the step (5), the temperature rise refers to a temperature rise of 480-780 ℃, the pressure for pressurization is 0.6-1.2MPa, and the time for heat preservation and pressure maintaining is 2.5-4.0 hours; the temperature reduction is 280-420 ℃; the time for heat preservation and pressure maintaining is 1.0-2.4 hours.
6. The method for treating municipal sludge according to claim 1, wherein in step (6), the absorbent is a solution of one or more of sodium hydroxide, calcium hydroxide, sodium carbonate and sodium bicarbonate; the concentration of the absorbent is 1-3%; the volume mixing ratio of the combustible gas to the hot air in the step (3) is 1:3-5.
7. The method of claim 2, wherein the weight ratios are dry weight ratios after conversion.
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| CN116854319A (en) * | 2023-05-29 | 2023-10-10 | 山东驰盛新能源设备有限公司 | Sludge treatment method and treatment device thereof |
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