CN110698021B - Organic sludge treatment method - Google Patents
Organic sludge treatment method Download PDFInfo
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- CN110698021B CN110698021B CN201910995192.7A CN201910995192A CN110698021B CN 110698021 B CN110698021 B CN 110698021B CN 201910995192 A CN201910995192 A CN 201910995192A CN 110698021 B CN110698021 B CN 110698021B
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- 239000010802 sludge Substances 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000000197 pyrolysis Methods 0.000 claims abstract description 139
- 239000007789 gas Substances 0.000 claims abstract description 86
- 238000010438 heat treatment Methods 0.000 claims abstract description 45
- 238000002485 combustion reaction Methods 0.000 claims abstract description 43
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000003345 natural gas Substances 0.000 claims abstract description 11
- 239000002737 fuel gas Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 9
- 238000007711 solidification Methods 0.000 abstract description 3
- 230000008023 solidification Effects 0.000 abstract description 3
- 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 1
- 238000005192 partition Methods 0.000 description 6
- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 231100000331 toxic Toxicity 0.000 description 4
- 230000002588 toxic effect Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 208000005156 Dehydration Diseases 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000002361 compost Substances 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 150000002013 dioxins Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000003516 soil conditioner Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
- C10B47/28—Other processes
- C10B47/32—Other processes in ovens with mechanical conveying means
- C10B47/44—Other processes in ovens with mechanical conveying means with conveyor-screws
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/02—Multi-step carbonising or coking processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
Abstract
The patent provides an organic sludge treatment method capable of efficiently treating sludge, which has the advantages of no dioxin generation, heavy metal solidification, high energy utilization rate and low energy loss, and uses a pyrolysis furnace with a plurality of pyrolysis chambers up and down in a furnace body, wherein each pyrolysis chamber comprises a fuel gas heating channel and a sludge channel, and each pyrolysis chamber, each fuel gas heating channel and each sludge channel are all communicated end to form an s shape. The organic sludge enters the pyrolysis furnace from a feed inlet of the sludge channel, is pyrolyzed in each pyrolysis chamber within 30-120 minutes, and is discharged from a discharge port; pyrolysis gas generated by pyrolysis of the organic sludge is sent to a pyrolysis gas combustion head to be mixed with air and then burned; natural gas and air are mixed and combusted in each combustion head; the temperature in each pyrolysis chamber is gradually increased from top to bottom, the temperature in the first pyrolysis chamber is 80-120 ℃, and the temperature in the last pyrolysis chamber is 630-680 ℃; the high-temperature gas in the gas heating channel and the organic sludge in the sludge channel flow in opposite directions.
Description
Technical Field
The patent belongs to the technical field of organic sludge treatment, and in particular relates to a treatment method and a treatment device for organic sludge.
Background
A large amount of sludge is generated in the sewage treatment process, and the sludge contains a large amount of toxic and harmful substances such as parasitic ova, pathogenic microorganisms, synthetic organic matters, heavy metal ions and the like. Therefore, the sludge needs to be treated and disposed in time, so that toxic and harmful substances in the sludge are stably treated or utilized; can comprehensively utilize useful substances and is harmful.
At present, the sludge is mainly treated in the modes of sanitary landfill, composting, incineration and the like, so that the sludge is reduced, stabilized, harmless and comprehensively utilized as much as possible. The sanitary landfill is adopted to treat the sludge, which is simple and convenient and has large treatment capacity, but the landfill site is difficult to select, occupies a large amount of land resources and has high cost, and secondary pollution to soil, atmosphere and water body is caused; the sludge compost is mainly used for agriculture, has the advantages of low investment, low energy consumption, low running cost and the like, can be used as an agricultural fertilizer and a soil conditioner, but contains a large amount of toxic and harmful substances and heavy metal ions which pollute soil and water; the sludge incineration can oxidize organic matters, effectively kills harmful pathogens, furthest reduces the volume of the sludge, but needs dehydration treatment before incineration, and needs a very high heat value during incineration, harmful gases such as sulfur dioxide, dioxin and the like can be generated, heavy metals in the sludge can pollute the air along with the diffusion of smoke dust, and the incineration cost is high.
Therefore, it is highly demanded to find a method and a device for treating organic sludge.
Disclosure of Invention
The purpose of this patent is to overcome the not enough of prior art and provide one kind and have not produced dioxin, solidification heavy metal, high energy utilization and low energy loss's advantage, can handle the organic sludge treatment method of mud with high efficiency.
The invention relates to a method for treating organic sludge, which uses an organic sludge pyrolysis furnace, wherein a furnace body of the organic sludge pyrolysis furnace is internally provided with a plurality of pyrolysis chambers, each pyrolysis chamber comprises a fuel gas heating channel and a sludge channel which are mutually independent and not communicated, and each pyrolysis chamber, each fuel gas heating channel and each sludge channel are communicated end to form an s shape; one end of a first sludge channel in the uppermost first pyrolysis chamber is provided with a feed inlet, and one end of a last sludge channel in the lowermost last pyrolysis chamber is provided with a discharge outlet; one end of a first gas heating channel in the first pyrolysis chamber is provided with a gas outlet; each gas heating channel is internally provided with a combustion head which is communicated with a natural gas supply pipeline and an air supply pipeline; the inner upper part of each sludge channel is communicated with an inlet of a pyrolysis gas pipeline, an outlet of the pyrolysis gas pipeline is communicated with a pyrolysis gas combustion head in a last gas heating channel arranged in a last pyrolysis chamber, and the pyrolysis gas combustion head is also communicated with an air supply pipeline; a spiral propeller for pushing the sludge input from the feed inlet to the discharge outlet is arranged in each sludge channel;
the organic sludge enters a pyrolysis furnace from a feed inlet, is pyrolyzed in each pyrolysis chamber within 30-120 minutes, and is discharged from a discharge outlet; pyrolysis gas generated by pyrolysis of the organic sludge is sent to a pyrolysis gas combustion head to be mixed with air and then burned; natural gas and air are mixed and combusted in each combustion head; the temperature in each pyrolysis chamber is gradually increased from top to bottom, the temperature in the first pyrolysis chamber is 80-120 ℃, and the temperature in the last pyrolysis chamber is 630-680 ℃; the high-temperature gas in the gas heating channel and the organic sludge in the sludge channel flow in opposite directions.
As a further improvement of the organic sludge treatment method, four pyrolysis chambers are arranged from top to bottom, and the temperatures of the pyrolysis chambers are respectively controlled at 100 ℃, 300 ℃, 450 ℃ and 650 ℃; the residence time of the organic sludge in the pyrolysis furnace was controlled at 45 minutes.
As a further improvement of the above-mentioned method for treating organic sludge, the flow rate of the gas in the pyrolysis chamber above the sludge in the sludge passage is 5m/s or less.
As a further improvement of the treatment method of the organic sludge, the air outlet is connected with a fan to exhaust air to the fuel gas heating channel, and the whole equipment keeps micro negative pressure operation.
As a further improvement of the treatment method of the organic sludge, the organic sludge is fed into a feed inlet after being cut into strips or granulated.
As a further improvement of the treatment method of the organic sludge, the water content of the organic sludge fed into the feed inlet is not more than 25%.
As a further improvement of the treatment method of the organic sludge, a pyrolysis gas pipeline is positioned in the furnace body.
As a further improvement of the method for treating the organic sludge, an inner vertical plate which divides the last gas heating channel into a left combustion chamber and a right combustion chamber which are communicated is arranged in the last gas heating channel, and the right combustion chamber is communicated with the last but one gas heating channel in the last but one pyrolysis chamber; the pyrolysis gas combustion head is located in the left combustion chamber, and the right combustion chamber is provided with the combustion head.
Compared with the prior art, the patent has the following advantages: the conditions for the formation of dioxins are known to be the presence of the basic element or precursor, a certain temperature, a metal catalyst and oxygen. For the patent, as the pyrolysis process is carried out in a reducing atmosphere under the anoxic condition, heavy metals can be reduced, and a plurality of conditions for generating dioxin are absent. After pyrolysis, the heavy metals are enriched in the residues with higher solid carbon content, the morphology is obviously changed, the exchangeable state proportion is reduced, the residue state proportion is increased, and the leaching toxicity of the heavy metals is reduced.
The pyrolysis gas is burnt in situ to utilize heat, so that the pyrolysis gas is subjected to self combustion and burning treatment, is thoroughly purified, flows reversely with the sludge, is fully utilized, has low exhaust heat, and can be used for further drying of the sludge.
Therefore, the treatment method and the treatment device (the organic sludge pyrolysis furnace) for the organic sludge can crack toxic organic matters, have the advantages of no dioxin generation, heavy metal solidification, high energy utilization rate and low energy loss, can treat the sludge efficiently, and realize the maximum utilization of resources by sludge treatment.
Drawings
FIG. 1 is a schematic diagram of an organic sludge pyrolysis furnace;
fig. 2 is a left-hand schematic view of fig. 1.
Detailed Description
Referring to the organic sludge pyrolysis furnace shown in fig. 1 and 2, there are four pyrolysis chambers in the furnace body 100: a first pyrolysis chamber 1, a second pyrolysis chamber 2, a third pyrolysis chamber 3, a fourth pyrolysis chamber (last pyrolysis chamber) 4. The first pyrolysis chamber 1 and the second pyrolysis chamber 2, the second pyrolysis chamber 2 and the third pyrolysis chamber 3, and the third pyrolysis chamber 3 and the fourth pyrolysis chamber 4 are respectively separated by a first partition plate 11, a second partition plate 12 and a third partition plate 13.
A first gap 21 and a third gap 23 are respectively arranged between the right end of the first partition plate 11, the right end of the third partition plate 13 and the inner wall of the furnace body, and a second gap 22 is arranged between the left end of the second partition plate 12 and the inner wall of the furnace body.
The first pyrolysis chamber 1, the second pyrolysis chamber 2, the third pyrolysis chamber 3, and the fourth pyrolysis chamber 4 respectively include a first gas heating channel 31 and a first sludge channel 41, a second gas heating channel 32 and a second sludge channel 42, a third gas heating channel 33 and a third sludge channel 43, and a fourth gas heating channel 34 and a fourth sludge channel 44, which are independent of each other.
The upper part of the left end of the first sludge channel 41 in the uppermost first pyrolysis chamber is provided with a feed inlet 51, the lower part of the right end of the first sludge channel 41 is communicated with the upper part of the right end of the second sludge channel 42 by passing through a first short vertical pipe 61 in the first gap 21, the lower part of the left end of the second sludge channel 42 is communicated with the upper part of the left end of the third sludge channel 43 by passing through a second short vertical pipe 62 in the second gap 22, the lower part of the right end of the third sludge channel 43 is communicated with the upper part of the right end of the fourth sludge channel 44 by passing through a third short vertical pipe 63 in the third gap 23, and the lower part of the left end of the fourth sludge channel 44 in the fourth pyrolysis chamber at the lowermost is provided with a discharge outlet 52. Screw propellers 401 for pushing organic sludge from left to right when rotating are arranged in the first sludge channel 41 and the third sludge channel 43, and screw propellers 402 for pushing organic sludge from right to left when rotating are arranged in the second sludge channel 42 and the fourth sludge channel 44.
The upper part of the left end of the first gas heating channel 31 is provided with a gas outlet 7 which is connected with a fan for exhausting the gas heating channel. The lower right end portion of the first gas heating passage 31 communicates with the upper right end portion of the second gas heating passage 32 through the first gap 21, and the lower left end portion of the second gas heating passage 32 communicates with the upper left end portion of the third gas heating passage 33 by passing through the second gap 22. The fourth gas heating passage 34 is provided therein with an inner riser 343 dividing it into a left combustion chamber 341 at the left and a right combustion chamber 342 at the right, which are communicated with each other, and the lower part of the right end of the third gas heating passage 33 communicates with the upper part of the right end of the right combustion chamber 342 by passing through the third gap 23.
The first gas heating channel 31, the second gas heating channel 32, the third gas heating channel 33, the fourth gas heating channel 34 and the like are communicated.
The first sludge passage 41, the second sludge passage 42, the third sludge passage 43, the fourth sludge passage 44, and the like are communicated. But the fuel gas heating channel and the sludge channel are independent and not communicated.
The first gas heating channel 31, the second gas heating channel 32, the third gas heating channel 33 and the right combustion chamber 342 are provided with combustion heads 8. The combustion head 8 is communicated with a natural gas supply pipeline 81 and an air supply pipeline 82.
The upper part of the interior of each sludge channel is communicated with the inlet of a pyrolysis gas pipeline 9 positioned in the furnace body, the outlet of the pyrolysis gas pipeline 9 is communicated with a pyrolysis gas combustion head 10 arranged in a left combustion chamber 341, and the pyrolysis gas combustion head 10 is also communicated with an air supply pipeline 82.
A method for treating organic sludge comprises the following steps:
the organic sludge enters a pyrolysis furnace from a feed port after being cut into strips or granulated, and is discharged from a discharge port after being fully pyrolyzed by a first pyrolysis chamber 1, a second pyrolysis chamber 2, a third pyrolysis chamber 3 and a fourth pyrolysis chamber 4;
the high-temperature gas in the gas heating channel and the organic sludge and other materials in the sludge channel flow reversely in a countercurrent way;
the organic sludge and other materials in the sludge channel are propelled by the spiral propellers, the propulsion speed of each propeller can be controlled respectively, and the residence time of the sludge in different sections can be controlled respectively by utilizing the capacity of each sludge channel;
the room temperature of each pyrolysis is respectively controlled at 100-650 ℃, and the total residence time is controlled at 30-120 minutes;
the total output of pyrolysis gas is controlled by controlling the volume and the feeding amount of the upper cavity of the sludge in each sludge channel, so that the gas speed in the pyrolysis cavity at the upper part in the sludge channel is ensured to be below 5m/s, the dusting critical wind speed can be further improved due to slitting or granulating, and conditions are provided for subsequent combustion by controlling the reduction of the dust content of the pyrolysis gas;
the combustion heads are respectively arranged in each gas heating channel, so that different temperatures of each section can be set according to different characteristics of materials, and the pyrolysis process is controlled;
the air outlet is connected with an air extraction fan, and the whole equipment keeps micro negative pressure operation.
The pyrolysis gas pipeline is positioned in the heat preservation layer of the furnace body of the pyrolysis furnace, the temperature of the pyrolysis gas pipeline is maintained to be more than or equal to 300 ℃ by the furnace body, so that a small amount of generated tar is kept in liquid state and gas state, and the tar directly enters a pyrolysis gas combustion head positioned in the left combustion chamber 341 to be combusted and then to recover heat. After in-situ incineration, the pyrolysis gas enters a right combustion chamber 342 which is separated, and after re-incineration purification is performed on the natural gas, the pyrolysis gas enters each pyrolysis chamber to provide required heat and ensure that the pyrolysis gas reaches the emission standard.
The utility model provides an organic sludge's processing apparatus, it is cut apart 4 pyrolysis rooms with the pyrolysis oven, and the feed inlet is located first pyrolysis room 1 top with the gas outlet in same side, and three air ducts such as discharge gate and two air supply pipeline, a natural gas supply pipeline are in fourth pyrolysis room 4 below, and air and natural gas are respectively from 4 below input of fourth pyrolysis room.
Example 1:
the organic sludge with 25% of water content after being cut into strips or granulated enters a pyrolysis furnace from a feed inlet, and is discharged from a discharge outlet after being fully pyrolyzed in four pyrolysis chambers.
The sludge channel is propelled by the spiral propellers, each group of propellers can respectively control the propulsion speed, the stay time of the sludge in different sections can be respectively controlled by utilizing the channel capacity, and the total stay time of the organic sludge is controlled to be 45 minutes.
The pyrolysis chambers are respectively provided with combustion heads, so that different temperatures of each section can be set according to different characteristics of materials, and the pyrolysis process is controlled; the temperatures of the first pyrolysis chamber 1, the second pyrolysis chamber 2, the third pyrolysis chamber 3 and the fourth pyrolysis chamber 4 are respectively controlled at 100 ℃, 300 ℃, 450 ℃ and 650 ℃.
The pyrolysis gas pipeline is positioned in the thermal insulation layer of the pyrolysis furnace, the temperature of the pipeline is kept at 350 ℃ by the furnace body, so that a small amount of generated tar is kept in liquid state and gas state, and the pyrolysis gas directly enters the pyrolysis chamber 4 for burning and then heat is recovered.
The weight of the sludge after pyrolysis is reduced by 80%, the pyrolysis product mainly comprises carbon and inorganic matters, the energy is basically self-contained, and only a small amount of heat is supplemented by natural gas.
Claims (2)
1. The organic sludge treatment method is characterized in that the organic sludge pyrolysis furnace is provided with four pyrolysis chambers from top to bottom in a furnace body, namely a first pyrolysis chamber, a second pyrolysis chamber, a third pyrolysis chamber and a fourth pyrolysis chamber, wherein each pyrolysis chamber comprises a fuel gas heating channel and a sludge channel which are mutually independent and not communicated, the fuel gas heating channels of the four pyrolysis chambers are communicated end to form an s shape, and the sludge channels of the four pyrolysis chambers are communicated end to form an s shape; one end of a first sludge channel in the uppermost first pyrolysis chamber is provided with a feed inlet, and one end of a last sludge channel in the lowermost fourth pyrolysis chamber is provided with a discharge outlet; one end of a first gas heating channel in the first pyrolysis chamber is provided with a gas outlet; each gas heating channel is internally provided with a combustion head which is communicated with a natural gas supply pipeline and an air supply pipeline; the pyrolysis gas pipeline is positioned in a heat preservation layer in the furnace body of the pyrolysis furnace, the inner upper part of each sludge channel is communicated with the inlet of the pyrolysis gas pipeline, the outlet of the pyrolysis gas pipeline is communicated with a pyrolysis gas combustion head in the last gas heating channel arranged in the fourth pyrolysis chamber, and the pyrolysis gas combustion head is also communicated with an air supply pipeline; a spiral propeller for pushing the sludge input from the feed inlet to the discharge outlet is arranged in each sludge channel;
the organic sludge with the water content not exceeding 25% enters a pyrolysis furnace from a feed inlet after being cut into strips or granulated, and is discharged from a discharge outlet after being pyrolyzed in each pyrolysis chamber within 45 minutes; the flow rate of gas in the pyrolysis cavity above the sludge in the sludge channel is below 5 m/s; pyrolysis gas generated by pyrolysis of the organic sludge is sent to a pyrolysis gas combustion head to be mixed with air and then burned; natural gas and air are mixed and combusted in each combustion head; the temperature in each pyrolysis chamber is gradually increased from top to bottom, and the temperatures of the first pyrolysis chamber, the second pyrolysis chamber, the third pyrolysis chamber and the fourth pyrolysis chamber are respectively controlled at 100 ℃, 300 ℃, 450 ℃ and 650 ℃; the flow direction of the high-temperature gas in the gas heating channel is opposite to that of the organic sludge in the sludge channel;
an inner vertical plate which divides the last gas heating channel into a left combustion chamber and a right combustion chamber which are communicated is arranged in the last gas heating channel, and the right combustion chamber is communicated with the penultimate gas heating channel in the third pyrolysis chamber; the pyrolysis gas combustion head is positioned in the left combustion chamber, and the right combustion chamber is provided with a combustion head; after in-situ incineration, the pyrolysis gas enters a right separated combustion chamber, and is incinerated and purified again by natural gas.
2. The method for treating organic sludge according to claim 1, wherein the air outlet is connected with a fan for exhausting air from the gas heating channel, and the whole equipment keeps micro negative pressure operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910995192.7A CN110698021B (en) | 2019-10-18 | 2019-10-18 | Organic sludge treatment method |
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| CN201910995192.7A CN110698021B (en) | 2019-10-18 | 2019-10-18 | Organic sludge treatment method |
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| CN110698021B true CN110698021B (en) | 2024-03-01 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104312600A (en) * | 2014-10-14 | 2015-01-28 | 北京北宇机械设备有限公司 | Sludge pyrolysis and gasification treatment process and sludge pyrolysis and gasification treatment system |
| CN206244626U (en) * | 2016-12-05 | 2017-06-13 | 北京中源环保工程有限公司 | Pyrolyzing sludge device |
| CN107098560A (en) * | 2017-06-19 | 2017-08-29 | 重庆航天机电设计院 | Sludge, greasy dirt are combined pyrolysis system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104312600A (en) * | 2014-10-14 | 2015-01-28 | 北京北宇机械设备有限公司 | Sludge pyrolysis and gasification treatment process and sludge pyrolysis and gasification treatment system |
| CN206244626U (en) * | 2016-12-05 | 2017-06-13 | 北京中源环保工程有限公司 | Pyrolyzing sludge device |
| CN107098560A (en) * | 2017-06-19 | 2017-08-29 | 重庆航天机电设计院 | Sludge, greasy dirt are combined pyrolysis system |
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