CN112156633A - Low temperature pyrolysis domestic waste exhaust-gas treatment system - Google Patents

Low temperature pyrolysis domestic waste exhaust-gas treatment system Download PDF

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CN112156633A
CN112156633A CN202010824755.9A CN202010824755A CN112156633A CN 112156633 A CN112156633 A CN 112156633A CN 202010824755 A CN202010824755 A CN 202010824755A CN 112156633 A CN112156633 A CN 112156633A
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sedimentation tank
temperature pyrolysis
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CN112156633B (en
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周悦先
韩智亮
熊伟
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract

The invention discloses a low-temperature pyrolysis household garbage waste gas treatment system, belongs to the technical field of environmental protection and purification, and particularly relates to the technical field of waste gas treatment of low-temperature pyrolysis of household garbage, so as to solve the problem that smoke with an excessive content can be generated in a low-temperature pyrolysis furnace. The waste gas of this application is monitored through on-line monitoring system after spray set, filtration purification device handle, all accords with "domestic waste burns pollution control standard", discharge to reach standard.

Description

Low temperature pyrolysis domestic waste exhaust-gas treatment system
Technical Field
The invention discloses a low-temperature pyrolysis household garbage waste gas treatment system, belongs to the technical field of environmental protection and purification, and particularly relates to the technical field of household garbage low-temperature pyrolysis waste gas treatment.
Background
At present, the domestic garbage treatment technology widely adopted in China is filling treatment, and the filling treatment technology has the advantages of simple process, convenient operation and minimum investment. However, the landfill treatment has serious hazards, such as large land occupation area, serious leachate pollution, short service life, multiple potential safety hazards and is not suitable for popularization.
The domestic garbage incineration is a mainstream mode for domestic garbage treatment in developed countries, and mainly comprises a full-scale incineration system, a garbage derived fuel, a block combined incineration system, a fluidized bed incinerator, pyrolysis and the like. As most domestic garbage in cities in China is still mixed and collected, the content of organic matters in the domestic garbage reaches 60 percent, and the water content is higher, so that the heat value of the domestic garbage is lower, and the low-grade heat value of the domestic garbage is required to be more than 800 kcal/kg by incineration.
The landfill technology and the incineration treatment technology are not suitable for effectively solving the problem of the household garbage for a long time.
The low-temperature heat treatment technology for the household garbage comprises the steps of simply sorting the household garbage, removing non-treatable substances (such as glass, ceramics, stones, metals and the like), and then feeding the rest household garbage into a pyrolysis furnace from a side feed inlet at the top of a low-temperature pyrolysis processor for pyrolysis. Domestic waste that drops into in the furnace body starts to heat rubbish to pyrolysis temperature (not higher than 300 degrees) through once heating, carries out thermochemical reaction in the furnace body, and domestic waste begins automatic decomposition, and the organic matter heat energy of release provides the condition of lasting reaction, decomposes outlet water vapor and mineral substance ash content simultaneously, and filter residue and furnace ash are discharged through bottom of the furnace ash discharging port.
The pyrolysis process also produces flue gas, i.e., exhaust gas, which contains excessive particulate matter, acidic gases, CO, heavy metals, and dioxins.
Disclosure of Invention
The invention aims to: the utility model provides a low temperature pyrolysis domestic waste exhaust-gas treatment system to solve the problem that above-mentioned low temperature pyrolysis stove can produce the flue gas that content exceeds standard.
The technical scheme adopted by the invention is as follows:
the utility model provides a low temperature pyrolysis domestic waste exhaust-gas treatment system, includes the low temperature pyrolysis stove, be provided with the gas outlet on the low temperature pyrolysis stove, still include consecutive spray set and filtration purification device, the gas outlet through first gas-supply pipe with the spray set intercommunication, spray set with through second gas-supply pipe intercommunication between the filtration purification device, be provided with first fan on the first gas-supply pipe, be provided with the second fan on the second gas-supply pipe, the filtration purification device top is provided with the gas vent, be provided with the sample appearance on the gas vent.
In the technical scheme of the application, the waste gas from the gas outlet of the low-temperature pyrolysis furnace is conveyed into the spraying device through the first gas conveying pipe under the action of the first fan, 75-85% of smoke dust and tar substances and 30-50% of SO are removed by spraying2、NOxThe sprayed waste gas is conveyed into the filtering and purifying device under the action of a second fan and a second gas conveying pipe, and the demisting layer removes moisture in the smoke gas, wherein the removal rate is 85-90%; the influence of moisture on subsequent composite adsorption material layers, biological composite material layers and adsorption layers is reduced, and the composite adsorption material layers further remove a small amount of large particle substances such as smoke dust, tar and the like and partial acid gas (SO) still existing in the flue gas2、NOxHF and HCl), the removal rate is 80-90%; the biological composite material layer removes odor and organic pollutants in the smoke, and the removal rate is 80-90%; the adsorption layer further purifies the flue gas to remove a small amount of residual pollutants such as SO in the flue gas2、NOxHF, HCl, heavy metals, dioxin, odor, organic pollutants and the like, wherein the removal rate is 95 percent, then the gas is sampled and is discharged after reaching the standard through on-line monitoring. The waste gas of this application is monitored through on-line monitoring system after spray set, filtration purifier handle, all accords with "domestic waste burns pollution control standard" (GB18485-2014), and discharge to reach standard.
Preferably, spray set is including the lye tank that is located the bottom and being located the spray room on lye tank upper portion, the below is provided with the whirl board in the spray room, the top of whirl board is provided with the baffle of a plurality of crisscross settings, the top of baffle is provided with three piece at least infusion branch pipes, every be provided with a plurality of showerheads, every on the infusion branch pipe extends to the outside of spray room, the intercommunication has the infusion to be responsible for on the lye tank, the infusion be responsible for all with every in the spray room outside the infusion branch pipe is linked together, the infusion is responsible for and is provided with the liquid pump. The whirl board is broken up waste gas, slows down waste gas flow velocity 30% through the setting of baffle to increase waste gas dwell time.
Preferably, the number of the infusion branch pipes of the spray chamber is three, and four spray headers are arranged on each infusion branch pipe. The water quantity of each spray header is 0.5m3/h。
Preferably, from supreme defogging layer, composite adsorption material layer, biological composite material layer and the adsorbed layer of having set gradually down in the filtration purifier, the second gas-supply pipe extends to the below on defogging layer. The demisting layer comprises hollow spheres, a water absorbent and a first support net, the hollow spheres and the water absorbent are uniformly distributed on the first support net, and 85-90% of water is removed by the demisting layer; the composite adsorption material layer comprises ceramic grain sand, aluminum oxide grains and a second support net, the ceramic grain sand and the aluminum oxide grains are layered on the second support net, the mass ratio of the ceramic grain sand to the aluminum oxide grains is 2-4:1-3, and the mass ratio of the ceramic grain sand to the aluminum oxide grains is 3: 2; the biological composite material layer comprises a strip-shaped biological carrier and a microbial preparation attached to the carrier; every 1m3Spraying 0.01m of strip-shaped biomass material3Preparing a biological composite material layer by using a microbial preparation; the adsorption layer is an activated carbon adsorption layer.
The lumpy biomass material is wood fiber material.
The microbial preparation comprises Lactobacillus plantarum, Rhodopseudomonas palustris, Candida utilis, Bacillus subtilis, Bacillus licheniformis and Bifidobacterium longum, Lactobacillus plantarum, Rhodopseudomonas palustris, Candida utilis, Bacillus subtilis, and Bacillus licheniformisThe volume ratio of the bacillus licheniformis liquid to the bifidobacterium longum liquid is 2.5-3.5: 1.5-2.5: 3-4.5: 1.2-2.5: 1-1.5: 0.8-1, and the concentration of the bacterial liquid of lactobacillus plantarum, rhodopseudomonas palustris, candida utilis, bacillus subtilis, bacillus licheniformis and bifidobacterium longum is respectively (4-6.5) multiplied by 108one/mL (3-5). times.108one/mL (4-6). times.108one/mL (4-6). times.108one/mL (1.6-5) x 108one/mL (2-4). times.108one/mL.
Preferably, the volume ratio of the bacteria liquid of lactobacillus plantarum, rhodopseudomonas palustris, candida utilis, bacillus subtilis, bacillus licheniformis and bifidobacterium longum in the microbial preparation is 2.5: 1.5: 3: 1.2: 1: 0.8, the concentrations of the bacterial solutions of lactobacillus plantarum, rhodopseudomonas palustris, candida utilis, bacillus subtilis, bacillus licheniformis and bifidobacterium longum are respectively 4 multiplied by 1082/mL, 3X 1082/mL, 4X 1082/mL, 4X 1081.6X 10 units/mL82X 10 units/mL8one/mL.
Preferably, the volume ratio of the bacteria liquid of lactobacillus plantarum, rhodopseudomonas palustris, candida utilis, bacillus subtilis, bacillus licheniformis and bifidobacterium longum in the microbial preparation is 3: 2: 3.5: 1.8: 1.2: 0.9, the concentrations of the bacterial solutions of lactobacillus plantarum, rhodopseudomonas palustris, candida utilis, bacillus subtilis, bacillus licheniformis and bifidobacterium longum are respectively 5 multiplied by 1082/mL, 4X 1082/mL, 5X 1082/mL, 5X 1082/mL, 3.2X 1082/mL, 3X 108one/mL.
Preferably, the volume ratio of the bacteria liquid of lactobacillus plantarum, rhodopseudomonas palustris, candida utilis, bacillus subtilis, bacillus licheniformis and bifidobacterium longum in the microbial preparation is 3.5: 2.5: 4.5: 2.5: 1.5: 1, the concentrations of the bacterial liquids of lactobacillus plantarum, rhodopseudomonas palustris, candida utilis, bacillus subtilis, bacillus licheniformis and bifidobacterium longum are respectively 6.5 multiplied by 1082/mL, 5X 108one/mL, 6X 108one/mL, 6X 1082/mL, 5X 1082/mL, 4X 108one/mL.
More preferably, the defogging layer, the composite adsorption material layer, the biological composite material layer and one side of the adsorption layer are respectively provided with a replacing opening, and the outer side of each replacing opening is provided with a first sealing door. The replacement port and the first sealing door are convenient to detach and replace.
More preferably, a gas distributor is arranged on the second gas transmission pipe port below the demisting layer. The gas distributor enables waste gas to be scattered as far as possible, the contact area between the waste gas and the demisting layer, the composite adsorption material layer, the biological composite material layer and the adsorption layer is increased, and the removal efficiency is high.
Preferably, bottom one side of spray room is provided with the leakage fluid dram, be provided with the second sealing door on the leakage fluid dram, one side of spray room still is provided with tertiary sedimentation tank, tertiary sedimentation tank includes rectangular bodily form's sedimentation tank body, this internal first baffle and the interior second baffle of passing through of sedimentation tank will first order sedimentation tank, second level sedimentation tank and third level sedimentation tank are separated into to the sedimentation tank body, first order sedimentation tank second level sedimentation tank with be provided with the feed liquor pipe on the third level sedimentation tank respectively, first baffle with be provided with the flowing liquid mouth on the second baffle respectively. Waste liquid from the leakage fluid dram enters into the tertiary sedimentation tank through the liquid inlet pipe, and circulating water is recycled after tertiary sedimentation, so that less pollution is discharged, the using amount of alkali liquor is saved, and different sedimentation tanks are selected to enter and settle according to the amount of waste residues contained in the waste liquid.
More preferably, the bottoms of the first-stage sedimentation tank, the second-stage sedimentation tank and the third-stage sedimentation tank are respectively provided with a slag collecting hopper, and the bottom of each slag collecting hopper is respectively provided with a detachable third sealing door.
Preferably, the exhaust port is further communicated with an evacuation pipe.
The first fan and the second fan are dustproof fans respectively.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. in the present invention,the waste gas from the low-temperature pyrolysis furnace is conveyed into a spraying device through a first gas pipe under the action of a first fan, 75-85% of smoke dust and tar substances and 30-50% of SO are removed by spraying2、NOxAnd tar, HF, HCl, heavy metals, dioxin and water-soluble pollutants, conveying the sprayed and treated waste gas to a filtering and purifying device under the action of a second fan and a second gas conveying pipe for treatment, then sampling the gas, and performing online monitoring to discharge the gas after reaching the standard. After being treated by the spraying device and the filtering and purifying device, the waste gas is monitored on line, and the waste gas meets the standard for controlling pollution of household garbage incineration (GB18485-2014), and is safely discharged;
2. the demisting layer removes moisture in the flue gas, and the removal rate is 85-90%; the influence of moisture on subsequent composite adsorption material layers, biological composite material layers and adsorption layers is reduced, and the composite adsorption material layers further remove a small amount of large particle substances such as smoke dust, tar and the like and partial acid gas (SO) still existing in the flue gas2、NOxHF and HCl), the removal rate is 80-90%; the biological composite material layer removes odor and organic pollutants in the smoke, and the removal rate is 80-90%; the adsorption layer further purifies the flue gas to remove a small amount of residual pollutants such as SO in the flue gas2、NOxHF, HCl, heavy metals, dioxin, odor, organic pollutants and the like, and the removal rate is 95 percent;
3. the operation cost is low, the material preparation purchase cost is low, the processing cost is low, the power cost is low, and other energy sources are not required to be input except for a draught fan and a spray water circulating water pump (liquid pump);
5. the discarded filler is easy to treat, part of the filler can be reused, the one-time investment cost can be reduced by more than 45%, the later-period operation cost can be reduced by more than 35%, the energy consumption can be saved by more than 50%, and the excellent effects of energy conservation and emission reduction can be achieved;
6. the low-cost demisting layer, the composite adsorption material layer and the biological composite material layer are applied to the front end of the activated carbon layer (adsorption layer), so that most of moisture, smoke dust, tar and the like in the flue gas can be removed in advance, the activated carbon can better play a role in adsorbing other organic pollutants, the service life and the replacement period of the activated carbon are prolonged, and the flue gas treatment operation cost is reduced;
7. the cyclone plate breaks up the waste gas, and the flow speed of the waste gas is reduced by 30 percent through the arrangement of the baffle plate, so that the retention time of the waste gas is prolonged;
8. the circulating water after the third-stage precipitation is recycled, so that the pollution discharge is less, and the using amount of alkali liquor is saved.
Drawings
FIG. 1 is a schematic structural diagram of a low-temperature pyrolysis household garbage waste gas treatment system according to the present invention;
FIG. 2 is a schematic structural view of a spraying device, a liquid discharge port and a second sealing door according to the present invention;
FIG. 3 is a plan view of a three-stage settling tank of the present invention;
FIG. 4 is a schematic structural view of a slag collecting hopper and a third sealing door of the sedimentation tank of the present invention.
The labels in the figure are: 1-a low-temperature pyrolysis furnace, 2-an air outlet, 3-a first air conveying pipe, 4-a first fan, 5-an infusion branch pipe, 6-a spray device, 7-a spray header, 8-a second air conveying pipe, 9-a second fan, 10-a filtering and purifying device, 11-an air outlet, 12-an emptying pipe, 13-a sampling instrument, 14-a replacement port, 15-a first sealing door, 16-an adsorption layer, 17-a biological composite material layer, 18-a composite adsorption material layer, 19-a demisting layer, 20-a gas distributor, 21-a spray chamber, 22-a baffle, 23-a rotational flow plate, 24-a lye tank, 25-a liquid pump, 26-an infusion main pipe, 27-a liquid outlet, 28-a second sealing door and 29-a sedimentation tank body, 30-a second-stage sedimentation tank, 31-a liquid inlet pipe, 32-a third-stage sedimentation tank, 33-a second partition plate, 34-a first partition plate, 35-a liquid outlet, 36-a first-stage sedimentation tank, 37-a slag collecting hopper and 38-a third sealing door.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1, a low temperature pyrolysis domestic waste gas treatment system, including low temperature pyrolysis oven 1, be provided with gas outlet 2 on the low temperature pyrolysis oven 1, still include consecutive spray set 6 and filtration purification device 10, gas outlet 2 through first gas-supply pipe 3 with spray set 6 intercommunication, spray set 6 with through second gas-supply pipe 8 intercommunication between the filtration purification device 10, be provided with first fan 4 on the first gas-supply pipe 3, be provided with second fan 9 on the second gas-supply pipe 8, filtration purification device 10 top is provided with gas vent 11, be provided with sample appearance 13 on the gas vent 11.
In the technical scheme of the application, the waste gas from the gas outlet 2 of the low-temperature pyrolysis furnace 1 is conveyed into a spraying device 6 through a first gas pipe 3 under the action of a first fan 4, 75-85% of smoke and tar substances, 30-50% of SO2, NOx, tar, HF, HCl, heavy metals, dioxin and water-soluble pollutants are removed by spraying, the sprayed waste gas is conveyed into a filtering and purifying device 10 under the action of a second fan 9 and a second gas pipe 8, a demisting layer 19 removes moisture in the smoke gas, and the removal rate is 85-90%; the influence of moisture on the subsequent composite adsorption material layer 18, the biological composite material layer 17 and the adsorption layer 16 is reduced, and the composite adsorption material layer 18 further removes a small amount of large particle substances such as smoke dust, tar and the like and partial acid gas (SO) still existing in the flue gas2NOx, HF and HCl), the removal rate is 80-90%; the biological composite material layer 17 removes odor and organic pollutants in the smoke, and the removal rate is 80-90%; the adsorbent layer 16 further purifies the flue gas to remove a small amount of remaining pollutants, such as SO, from the flue gas2NOx, HF, HCl, heavy metal, dioxin, odor, organic pollutants and the like, wherein the removal rate is 95 percent, and then gas is sampled and is discharged after reaching the standard through online monitoring. The waste gas of this application is monitored through on-line monitoring system after spray set 6, filtration purification device 10 are handled, all accords with "domestic waste burns pollution control standard" (GB18485-2014), discharge to reach standard.
Example 2
As shown in fig. 1, on the basis of embodiment 1, the spraying device 6 includes a lye tank 24 located at the bottom and a spray chamber 21 located at the upper portion of the lye tank 24, a rotational flow plate 23 is disposed in the spray chamber 21 at the lower portion, a plurality of baffles 22 arranged in a staggered manner are disposed above the rotational flow plate 23, at least three infusion branch pipes 5 are disposed above the baffles 22, a plurality of spray heads 7 are disposed on each infusion branch pipe 5, each infusion branch pipe 5 extends to the outer side of the spray chamber 21, an infusion main pipe 26 is communicated with the lye tank 24, the infusion main pipe 26 is communicated with each infusion branch pipe 5 outside the spray chamber 21, and a liquid pump 25 is disposed on the infusion main pipe 26. The swirl plate 23 breaks up the exhaust gas and slows down the exhaust gas flow rate by 30% by the arrangement of the baffle 22, thereby increasing the exhaust gas residence time.
Example 3
As shown in fig. 1, in example 1, there are three liquid supply branch pipes 5 of the shower chamber 21, and four shower heads 7 are provided on each liquid supply branch pipe 5. The water quantity of each spray header 7 is 0.5m3/h。
Example 4
As shown in fig. 1, on the basis of embodiment 1, a defogging layer 19, a composite adsorption material layer 18, a biological composite material layer 17 and an adsorption layer 16 are sequentially arranged in the filtering and purifying device 10 from bottom to top, and the second air duct 8 extends to the lower side of the defogging layer 19. The demisting layer 19 comprises hollow spheres, a water absorbent and a first support net, the hollow spheres and the water absorbent are uniformly distributed on the first support net, and 85-90% of water is removed by the demisting layer 19; the composite adsorption material layer 18 comprises ceramic grain sand, aluminum oxide grains and a second support net, the ceramic grain sand and the aluminum oxide grains are layered on the second support net, the mass ratio of the ceramic grain sand to the aluminum oxide grains is 2-4:1-3, and the mass ratio of the ceramic grain sand to the aluminum oxide grains is 3: 2; the biological composite material layer 17 comprises a strip-shaped biological carrier and a microbial preparation attached to the carrier; spraying 0.01m of biomass material in each 1m3 pieces3Preparing a biological composite material layer 17 by using a microbial preparation; the adsorption layer 16 is an activated carbon adsorption layer 16.
Example 5
As shown in fig. 1, in addition to example 1, replacement ports 14 are provided on one side of the defogging layer 19, the composite adsorption material layer 18, the biological composite material layer 17 and the adsorption layer 16, and a first sealing door 15 is provided on the outer side of each replacement port 14. The provision of the replacement port 14 and the first sealing door 15 facilitates removal and replacement.
Example 6
As shown in fig. 1, on the basis of embodiment 1, a gas distributor 20 is arranged at the port of the second gas pipe 8 below the defogging layer 19. The gas distributor 20 disperses the waste gas as much as possible, increases the contact area with the demisting layer 19, the composite adsorption material layer 18, the biological composite material layer 17 and the adsorption layer 16, and has high removal efficiency.
Example 7
As shown in fig. 2 to 3, on the basis of embodiment 1, a liquid outlet 27 is provided at one side of the bottom of the spray chamber 21, a second sealing door 28 is provided on the liquid outlet 27, a third-stage sedimentation tank is further provided at one side of the spray chamber 21, the third-stage sedimentation tank includes a rectangular sedimentation tank body 29, the sedimentation tank body 29 is divided into a first-stage sedimentation tank 36, a second-stage sedimentation tank 30 and a third-stage sedimentation tank 32 by a first partition plate 34 and a second partition plate 33, the first-stage sedimentation tank 36, the second-stage sedimentation tank 30 and the third-stage sedimentation tank 32 are respectively provided with a liquid inlet pipe 31, and the first partition plate 34 and the second partition plate 33 are respectively provided with a liquid outlet 35. The waste liquid from the liquid outlet 27 enters the three-stage sedimentation tank through the liquid inlet pipe 31, the circulating water is recycled after the three-stage sedimentation, the pollution discharge is less, the using amount of alkali liquor is saved, and different sedimentation tanks are selected to enter and settle according to the amount of waste residues contained in the waste liquid.
Example 8
As shown in fig. 4, on the basis of embodiment 1, slag collecting hoppers 37 are respectively disposed at the bottoms of the first-stage sedimentation tank 36, the second-stage sedimentation tank 30 and the third-stage sedimentation tank 32, and a detachable third sealing door 38 is respectively disposed at the bottom of each slag collecting hopper 37.
Example 9
As shown in fig. 1, in addition to example 1, an evacuation pipe 12 is connected to the exhaust port 11.
Example 10
A waste gas treatment method for low-temperature pyrolysis of household garbage comprises the following steps:
step 1, inputting the waste gas into a spraying device, and spraying the waste gas by spraying a spraying liquid to remove part of smoke dust and tar substances and part of SO2、NOxHF, HCl, heavy metals and dioxins and water-soluble contaminants; the waste gas comes from a low-temperature household garbage pyrolysis furnace; the waste gas is sprayed by spraying liquid to remove 75-85% of smoke dust and tar substances and 30-50% of SO2、NOxHF, HCl, heavy metals and dioxins and water-soluble contaminants; the spraying liquid is an alkali solution with the concentration of 5 percent, and the alkali solution is a sodium hydroxide alkali solution; the waste liquid flowing out of the spraying device after being sprayed is recycled after being precipitated for at least three stages;
step 2, treating the waste gas treated by the spraying device in the step 1 by a filtering and purifying device, and removing residual smoke dust and tar substances and residual SO in the filtering and purifying device by the waste gas sequentially through a defogging layer, a composite adsorption material layer, a biological composite material layer and an adsorption layer2、NOxHF, HCl, heavy metals and dioxins and water-soluble contaminants; the demisting layer comprises hollow spheres, a water absorbent and a first support net, the hollow spheres and the water absorbent are uniformly distributed on the first support net, and 85-90% of water is removed by the demisting layer; the composite adsorption material layer comprises ceramsite sand, alumina particles and a second support net, wherein the ceramsite sand and the alumina particles are layered on the second support net, and the mass ratio of the ceramsite sand to the alumina particles is 3: 2; the biological composite material layer comprises a strip-shaped biological carrier and a microbial preparation attached to the carrier. Every 1m3Spraying 0.01m of strip-shaped biomass material3Preparing a biological composite material layer by using a microbial preparation; the adsorption layer is an active carbon adsorption layer;
and 3, performing on-line monitoring on the gas treated by the filtering and purifying device, and discharging the gas after reaching the standard.
Example 11
On the basis of the embodiment 1, the spraying liquid in the step 1 is an alkali solution with the concentration of 1 percent; the mass ratio of the ceramsite sand to the alumina particles in the step 2 was 2:1, and the rest of the steps were the same as in example 1.
Example 12
On the basis of the embodiment 1, the spraying liquid in the step 1 is an alkali solution with the concentration of 5 percent; the mass ratio of the ceramsite sand to the alumina particles in the step 2 was 4:3, and the rest of the steps were the same as in example 1.
Detecting the components of the waste gas from the low-temperature household garbage pyrolysis furnace, wherein the detection results are shown in table 1; after the above-mentioned exhaust gas was treated by the exhaust gas treatment method of examples 10 to 12 of the present application, the treated gas was examined and the indexes thereof are shown in Table 2.
TABLE 1 pollutant content in exhaust gas from low-temperature pyrolysis furnace for household garbage
Figure BDA0002635746030000071
Figure BDA0002635746030000081
TABLE 2 gas composition after treatment of exhaust gas treatment methods of examples 1 to 3
Figure BDA0002635746030000082
As shown in Table 2, the indexes of the exhaust gas treated by the exhaust gas treatment methods of the embodiments 10 to 12 of the present application all reach standards and can be safely discharged.
The detection equipment is a TR-9300E type continuous monitoring system for the emission of flue gas generated by burning solid waste garbage.
The arrangement of the monitoring holes and the monitoring sampling method can be according to the method for measuring particulate matters in exhaust gas of fixed pollution sources and sampling gaseous pollutants (GB/T16157-1996); data acquisition and control were performed according to the pollution source on-line automatic monitoring (supervision) system data transfer standard (HJ/T212-2005).
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, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. The utility model provides a low temperature pyrolysis domestic waste exhaust-gas treatment system, includes low temperature pyrolysis oven (1), be provided with gas outlet (2) on low temperature pyrolysis oven (1), its characterized in that: still including consecutive spray set (6) and filtration purification device (10), gas outlet (2) through first gas-supply pipe (3) with spray set (6) intercommunication, spray set (6) with through second gas-supply pipe (8) intercommunication between filtration purification device (10), be provided with first fan (4) on first gas-supply pipe (3), be provided with second fan (9) on second gas-supply pipe (8), filtration purification device (10) top is provided with gas vent (11), be provided with sample appearance (13) on gas vent (11).
2. The low-temperature pyrolysis household garbage waste gas treatment system according to claim 1, characterized in that: spray set (6) are including lye tank (24) that are located the bottom and be located spray chamber (21) on lye tank (24) upper portion, the below is provided with whirl board (23) in spray chamber (21), the top of whirl board (23) is provided with a plurality of crisscross baffles (22) that set up, the top of baffle (22) is provided with three at least infusion branch pipes (5), every be provided with a plurality of shower heads (7) on infusion branch pipe (5), every infusion branch pipe (5) extend to the outside of spray chamber (21), the intercommunication has infusion (26) on lye tank (24), infusion person in charge (26) all with every in spray chamber (21) outside infusion branch pipe (5) are linked together, be provided with liquid pump (25) on infusion person in charge (26).
3. The waste gas treatment system for low-temperature pyrolysis household garbage according to claim 1, wherein the number of the liquid feeding branch pipes (5) of the spray room (21) is three, and four spray headers (7) are arranged on each liquid feeding branch pipe (5).
4. The low-temperature pyrolysis household garbage waste gas treatment system according to claim 1, characterized in that: the filtering and purifying device is characterized in that a defogging layer (19), a composite adsorption material layer (18), a biological composite material layer (17) and an adsorption layer (16) are sequentially arranged in the filtering and purifying device (10) from bottom to top, and the second gas pipe (8) extends to the lower side of the defogging layer (19).
5. The low-temperature pyrolysis household garbage waste gas treatment system according to claim 4, characterized in that: the defogging layer (19), the composite adsorption material layer (18), the biological composite material layer (17) and one side of the adsorption layer (16) are respectively provided with a replacing opening (14), and the outer side of each replacing opening (14) is provided with a first sealing door (15).
6. The low-temperature pyrolysis household garbage waste gas treatment system according to claim 4, characterized in that: and a gas distributor (20) is arranged on the port of the second gas conveying pipe (8) below the demisting layer (19).
7. The low-temperature pyrolysis household garbage waste gas treatment system according to claim 1, characterized in that: bottom one side of spray room (21) is provided with leakage fluid dram (27), be provided with second sealing door (28) on leakage fluid dram (27), one side of spray room (21) still is provided with tertiary sedimentation tank, tertiary sedimentation tank includes rectangular bodily form sedimentation tank body (29), will through first baffle (34) and second baffle (33) in sedimentation tank body (29) first order sedimentation tank (36), second level sedimentation tank (30) and third level sedimentation tank (32) are separated into in sedimentation tank body (29), first order sedimentation tank (36) second level sedimentation tank (30) with be provided with feed liquor pipe (31) on third level sedimentation tank (32) respectively, first baffle (34) with be provided with liquid outlet (35) on second baffle (33) respectively.
8. The low-temperature pyrolysis household garbage waste gas treatment system according to claim 7, characterized in that: the bottom of the first-stage sedimentation tank (36), the bottom of the second-stage sedimentation tank (30) and the bottom of the third-stage sedimentation tank (32) are respectively provided with a slag collecting hopper (37), and the bottom of each slag collecting hopper (37) is respectively provided with a detachable third sealing door (38).
9. The low-temperature pyrolysis household garbage waste gas treatment system according to claim 1, characterized in that: the exhaust port (11) is also communicated with an emptying pipe (12).
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CN206398724U (en) * 2017-01-04 2017-08-11 江西天伦水处理设备有限公司 A kind of refuse pyrolysis carbide furnace and gas cleaning integrated apparatus
CN207708764U (en) * 2018-03-23 2018-08-10 辽宁国测黄金股份有限公司 Boiler flue gas purification system
CN209901014U (en) * 2019-03-09 2020-01-07 广东玛蓝生态环境有限公司 Flue gas deodorization system for waste incineration power plant
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001070747A (en) * 1999-09-06 2001-03-21 Ebara Corp Method and apparatus for treating nitrogen compound- containing waste gas
CN205535836U (en) * 2016-03-04 2016-08-31 农蔚 Domestic waste low temperature pyrolysis vaporization integration processing system
CN205760491U (en) * 2016-05-27 2016-12-07 四川蓝星机械有限公司 A kind of scrubbing tower of preventing urea from caking
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