CN109966900B - Flue gas purification system of pyrolysis gasifier - Google Patents
Flue gas purification system of pyrolysis gasifier Download PDFInfo
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- CN109966900B CN109966900B CN201910177317.5A CN201910177317A CN109966900B CN 109966900 B CN109966900 B CN 109966900B CN 201910177317 A CN201910177317 A CN 201910177317A CN 109966900 B CN109966900 B CN 109966900B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
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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
- B01D53/38—Removing components of undefined structure
- B01D53/40—Acidic components
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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
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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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
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
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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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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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
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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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
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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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
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2045—Hydrochloric acid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2047—Hydrofluoric acid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention discloses a flue gas purification system of a pyrolysis gasifier, which relates to the technical field of hazardous waste incineration flue gas treatment, and is technically characterized by comprising a neutralization tower, a drying tower, a bag-type dust remover, a washing tower and a chimney which are sequentially communicated, and further comprising a slaked lime solution adding device and a baking soda solution adding device, wherein the liquid outlet of the slaked lime solution adding device and the top end of the neutralization tower are communicated; the invention has the advantage of improving the flue gas purification effect of the pyrolysis gasifier.
Description
Technical Field
The invention relates to the technical field of hazardous waste incineration flue gas treatment, in particular to a flue gas purification system of a pyrolysis gasifier.
Background
Incineration is one of important means for safe disposal of hazardous waste, and the incineration disposal can realize waste heat recycling while realizing reduction and harmless disposal of the hazardous waste. The national policy of hazardous waste pollution control technology released in 2001 encourages research and development of high-efficiency and practical hazardous waste incineration complete technologies and equipment, including hazardous waste incinerator technologies, hazardous waste incineration pollution control technologies, hazardous waste incineration waste heat recycling technologies and the like, and the hazardous waste incineration pollution control standard (GB 18484-2001) released in the same year provides pollution emission control requirements for incineration disposal of hazardous waste. The office of the national ministry of environmental protection has issued a letter (loop letter [2014] 1386) on soliciting opinions on the national environmental protection standard hazardous waste incineration pollution control standard (solicitation draft) in 2014 10.
As can be known from the standard, the limit value of a plurality of emissions is greatly improved, the flue gas purification system of the pyrolysis gasification furnace adopted in the prior art generally comprises a neutralization tower, a drying tower, a bag-type dust remover, a washing tower and a chimney which are sequentially communicated, wherein, the gas inlet of the neutralization tower is communicated with the waste gas outlet of the pyrolysis gasifier system, the neutralization tower is used for neutralizing the waste gas, the water content in the neutralized waste gas is removed by the drying tower, the residual dust in the waste gas can be filtered by the bag-type dust remover, the flue gas is washed by the washing tower and finally discharged through a chimney, the waste gas filtered by the smoke evolution system can meet the hazardous waste incineration pollution control standard (GB 18484-2001), however, the emission of some pollutants can not meet the standard limit of hazardous waste incineration pollution control standard (petition draft). In order to respond to the call of national energy conservation and emission reduction, the model function of environmental protection enterprises is well done, so the existing flue gas purification system needs to be improved.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to provide a flue gas purification system of a pyrolysis gasifier, which has the advantage of improving the flue gas purification effect of the pyrolysis gasifier.
In order to achieve the purpose, the invention provides the following technical scheme: including the neutralizing tower, drying tower, sack cleaner, scrubbing tower and the chimney that communicate in proper order and set up, still include the slaked lime solution joining device and the baking soda solution joining device of liquid outlet and neutralizing tower top intercommunication, the inside level of neutralizing tower is provided with the first gondola water faucet that sprays and the second that sprays the gondola water faucet that communicates with the liquid outlet that baking soda solution joining device and slaked lime solution joined device respectively, the level of first gondola water faucet that sprays is higher than the second sprays the gondola water faucet, the level is provided with the first active carbon filter screen that is in between first gondola water faucet and the second spray the gondola water faucet and is in the second and sprays the second active carbon filter screen of gondola water faucet below in the neutralizing tower.
By adopting the technical scheme, harmful substances contained in the waste gas discharged by the pyrolysis gasifier system can be purified by utilizing the matching among the neutralization tower, the drying tower, the bag-type dust remover, the washing tower and the chimney, wherein when the waste gas passes through the neutralization tower, a slaked lime solution and a baking soda solution are sprayed into the neutralization tower between the slaked lime solution adding device and the baking soda solution adding device and the first spraying shower head and between the slaked lime solution adding device and the baking soda solution adding device and the second spraying shower head, and the slaked lime solution and the baking soda solution can respectively permeate the second activated carbon filter screen and the first activated carbon filter screen when being sprayed into the neutralization tower; when the waste gas loops through the second activated carbon filter screen and the first activated carbon filter screen in turn, most harmful substances contained in the waste gas can be fully purified by the second activated carbon filter screen, the first activated carbon filter screen, and a slaked lime solution and a baking soda solution which respectively permeate the second activated carbon filter screen and the first activated carbon filter screen, so that the effect of greatly improving the purification capacity of the flue gas discharged by the existing pyrolysis gasifier is achieved.
The invention is further configured to: the slaked lime solution adding device and the baking soda solution adding device both comprise a support, a plurality of quantitative hoppers fixed at the upper end of the support, a stirrer with a feed inlet communicated with a discharge outlet of each quantitative hopper and a water inlet communicated with an external water source, and a hydraulic pump with a water inlet and a water outlet respectively communicated with the stirrer and the neutralization tower.
Through adopting above-mentioned technical scheme, it is automatic to utilize the proportioning bin can the slaked lime powder or the baking soda powder, the quantitative agitator that adds, utilize the support to support each proportioning bin, utilize the mixer can be with slaked lime powder or baking soda powder and running water mixing, utilize the hydraulic pump can take out the slaked lime solution or the baking soda solution that homogenize and pour into in the neutralization tower, be convenient for each proportioning bin alternate use through setting up many proportioning bins, can do interim replacement when partial proportioning bin damages.
The invention is further configured to: spiral lifting devices are arranged on one sides of the slaked lime solution adding device and the sodium bicarbonate solution adding device, a plurality of rollers are arranged at the lower ends of the two spiral lifting devices, and discharge ports at the upper ends of the two spiral lifting devices extend to the upper portions of the feed inlets of the quantitative hoppers.
Through adopting above-mentioned technical scheme, make the staff can follow the low lime hydrate powder or sodium bicarbonate powder of adding to the quantitative hopper that is in the eminence through spiral lifting device, be provided with the gyro wheel on spiral lifting device and be convenient for the staff to remove spiral lifting device for the staff can utilize a hoisting device to carry out the material loading for each quantitative hopper.
The invention is further configured to: first activated carbon non-woven fabrics have all been laid to the upper surface of first activated carbon filter screen and second activated carbon filter screen, the lower surface of first activated carbon filter screen and second activated carbon filter screen all utilizes the magic to paste and has pasted the second activated carbon non-woven fabrics.
Through adopting above-mentioned technical scheme, the easy thick liquid of hanging of slaked lime solution or sodium bicarbonate solution is on first active carbon non-woven fabrics and second active carbon non-woven fabrics for slaked lime solution or sodium bicarbonate solution are stayed on first active carbon filter screen or second active carbon filter screen more easily, utilize the magic subsides to be convenient for the staff to tear the second active carbon non-woven fabrics off and wash.
The invention is further configured to: the neutralization tower is characterized in that a first inclined filter screen positioned between the first activated carbon filter screen and the second drain pipe is obliquely arranged inside the neutralization tower, a second inclined filter screen positioned below the second activated carbon filter screen is obliquely arranged inside the neutralization tower, two liquid discharge ports corresponding to the inclined lower end positions of the first inclined filter screen and the second inclined filter screen are arranged on the neutralization tower respectively, and an alkaline liquor circulating pool communicated with the two liquid discharge ports is arranged outside the neutralization tower.
Through adopting above-mentioned technical scheme, utilize first slope filter screen and second to mould the system net not only can avoid the baking soda solution and the slaked lime solution that spray to mix together in order to prevent both to take place the reaction, and can guide unnecessary baking soda solution and slaked lime solution to come together, utilize the cooperation between leakage fluid dram and the alkali lye hydrologic cycle pond to retrieve unnecessary baking soda solution and slaked lime solution.
The invention is further configured to: the neutralizing tower is provided with a plurality of openings corresponding to the positions of the first activated carbon filter screen and the second activated carbon filter screen, and the outer wall of the neutralizing tower is rotatably connected with a plurality of glass windows used for sealing the openings.
Through adopting above-mentioned technical scheme, utilize the opening and rotate the glass window that connects on the outer wall of neutralization tower to be convenient for the staff and take out first activated carbon non-woven fabrics and second activated carbon non-woven fabrics and wash outside the neutralization tower.
The invention is further configured to: and a plurality of alkali liquor conveying spray pipes are distributed on the inner wall of the bottom of the neutralization tower, and the liquid inlet ends of the alkali liquor conveying spray pipes are communicated with the water outlet of the alkali liquor water circulation tank.
Through adopting above-mentioned technical scheme, utilize the cooperation between neutralization tower, alkali lye injection pipe and the alkali lye water circulation pond to carry out preliminary deacidification to the waste gas in the input neutralization tower, and can play certain dust fall effect for it is difficult for causing the jam to first active carbon filter screen or second active carbon filter screen when waste gas passes through second active carbon filter screen and second active carbon filter screen.
The invention is further configured to: still including setting up the flue gas heater between drying tower and sack cleaner, the former flue gas import of flue gas heater and the gas vent intercommunication of drying tower, the steam outlet of flue gas heater and the steam inlet intercommunication of pyrolysis gasifier system, the net flue gas export of flue gas heater and the air inlet intercommunication of sack cleaner.
Through adopting above-mentioned technical scheme, utilize flue gas heater can heat the tail gas that the drying tower discharged out, the pyrolysis can take place for some residual harmful substance in the tail gas after the heating, and current pyrolysis gasifier system needs a certain amount of hot steam at the during operation, can play the effect of steam retrieval and utilization with flue gas heater's steam outlet and pyrolysis gasifier system's steam inlet intercommunication.
The invention is further configured to: the bag-type dust collector is provided with two bag-type dust collectors, the air inlets of the two bag-type dust collectors are communicated with the air outlet of the drying tower, the air outlets of the two bag-type dust collectors are communicated with the original flue gas inlet of the flue gas heater, and valves are arranged on the air inlets and the air outlets of the two bag-type dust collectors.
By adopting the technical scheme, the two bag-type dust collectors are arranged, and the upper valves are arranged on the air inlets and the air outlets of the two bag-type dust collectors, so that the two bag-type dust collectors can be used alternately, and another bag-type dust collector can be directly used when one bag-type dust collector needs to be maintained.
The invention is further configured to: the chimney is provided with a plurality of draught fans which are arranged at equal intervals along the height direction of the chimney, and air outlets of the draught fans are communicated with the inside of the chimney, and air outlets of the draught fans are inclined upwards.
Through adopting above-mentioned technical scheme, can play the effect of guide waste gas upflow in the chimney through the cooperation between many draught fans, set up many draught fans and make the height of chimney increase by a wide margin for waste gas can spread as far as when being discharged by the chimney.
Compared with the prior art, the invention has the beneficial effects that:
(1) most harmful substances contained in flue gas can be effectively discharged through the matching of the baking soda solution adding device and the slaked lime solution adding device and the first activated carbon filter screen and the second activated carbon filter screen which are arranged in the neutralization tower;
(2) through the cooperation of the alkali liquor water circulation tank, the two inclined filter screens and each alkali liquor injection pipe, the flue gas which initially enters the neutralization tower can be subjected to deacidification and dust fall, so that the first activated carbon filter screen and the second activated carbon filter screen are not easy to block;
(3) the purified flue gas can be pyrolyzed through the flue gas heater, the content of harmful substances in the flue gas is further reduced, and the generated steam can be reused in a flue gas purification system of the pyrolysis gasifier, so that the cost is effectively reduced.
Drawings
FIG. 1 is a schematic diagram of the system of the present embodiment;
FIG. 2 is a schematic structural view of a neutralization tower assembly according to the present embodiment;
FIG. 3 is a schematic view showing the structure of a slaked lime solution adding apparatus or a sodium bicarbonate solution adding apparatus according to this embodiment.
Reference numerals: 1. a neutralization tower assembly; 11. a neutralization tower; 111. a first activated carbon filter screen; 1111. a first activated carbon non-woven fabric; 1112. a second activated carbon non-woven fabric; 112. a first inclined filter screen; 113. a first spray shower; 114. a second shower head; 115. a glass window; 116. an opening; 117. a liquid discharge port; 118. a second inclined filter screen; 119. a second activated carbon filter screen; 12. a sodium bicarbonate solution adding device; 121. a support; 122. a dosing hopper; 123. a blender; 124. a hydraulic pump; 125. a spiral lifting device; 126. a roller; 13. a slaked lime solution adding device; 2. a drying tower; 3. a flue gas heater; 4. a bag-type dust collector assembly; 41. a bag-type dust collector; 42. a valve; 5. a washing tower; 6. an alkali liquor water circulation tank; 61. an alkali liquor conveying spray pipe; 7. a chimney; 71. an induced draft fan; 72. and a third activated carbon filter screen.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
A flue gas purification system of a pyrolysis gasifier, as shown in figure 1, comprises a neutralization tower component 1 with a lower end air inlet communicated with a flue gas outlet of a pyrolysis gasifier system for neutralizing flue gas, a drying tower 2 with a lower end air inlet communicated with an air outlet of the neutralization tower component 1 for drying flue gas, a flue gas heater 3 with an original flue gas inlet and a steam outlet communicated with an upper end air outlet of the drying tower 2 and a steam inlet of the pyrolysis gasifier system for pyrolyzing flue gas, a bag-type dust remover component 4 with an air inlet communicated with a clean flue gas outlet of the flue gas heater 3 for filtering residual dust in flue gas, a washing tower 5 with a lower end air inlet communicated with an air outlet of the bag-type dust remover component 4 for filtering flue gas again, a liquid outlet communicated with the neutralization tower 11 and the washing tower 5 for improving alkali liquor for the neutralization tower 11 and the washing tower 5, and an upper end air outlet communicated with an air outlet of the washing tower 5 A chimney 7 for discharging the purified flue gas; among them, among the prior art, pyrolysis gasifier system generally includes the pyrolysis gasifier that is used for burning hazardous waste and is used for retrieving the interior thermal exhaust-heat boiler that contains of flue gas, and pyrolysis gasifier and exhaust-heat boiler all need steam to participate in at the during operation, consequently, the steam that flue gas heater 3 during operation produced can directly be used back in pyrolysis gasifier and exhaust-heat boiler.
As shown in fig. 1, the neutralization tower assembly 1 includes a neutralization tower 11 for neutralizing harmful substances contained in flue gas, a slaked lime solution adding device 13 for supplying a slaked lime solution to the neutralization tower 11, and a baking soda solution adding device 12 for supplying a baking soda solution to the neutralization tower 11.
As shown in fig. 2, a first shower head 113 and a second shower head 114, which are respectively connected to the outlets of the baking soda solution adding device 12 and the slaked lime solution adding device 13 and are disposed in a vertical relationship to each other, are disposed at the top end of the scrubber 5 to spray the baking soda solution and the slaked lime solution, respectively. A first activated carbon filter 111 between the first and second showers 113 and 114 for receiving the baking soda solution and a second activated carbon filter 119 under the second showerhead 114 for receiving the slaked lime solution are further disposed in the scrubber tower 5, and a first inclined filter 112 between the first and second activated carbon filters 111 and 114 for collecting the excess baking soda solution and a second inclined filter 118 for collecting the excess slaked lime solution are further obliquely disposed in the scrubber tower 5. A first activated carbon non-woven fabric 1111 is laid on the upper surfaces of the first activated carbon filter screen 111 and the second activated carbon filter screen 119, and a second activated carbon non-woven fabric 1112 is detachably connected to the lower surfaces of the first activated carbon filter screen 111 and the second activated carbon filter screen 119 through hook and loop fasteners.
When the baking soda solution and the slaked lime solution are sprayed through the first spray shower 113 and the second spray shower 114 respectively, the baking soda solution and the slaked lime solution are respectively attached to the two pieces of the first activated carbon non-woven fabric 1111, and the first activated carbon non-woven fabric 1111 can be used for achieving the effect of diffusing the baking soda solution and the slaked lime solution, when the baking soda solution and the slaked lime solution pass through the first activated carbon filter 111 and the second activated carbon filter 119 respectively, the two pieces of the second activated carbon non-woven fabric 1112 can continuously retain the baking soda solution and the slaked lime solution, prolong the service life of the baking soda solution and the slaked lime solution, when the baking soda solution and the slaked lime solution completely permeate the second activated carbon non-woven fabric 1112, the dropping baking soda solution and the slaked lime solution can be collected by the first inclined filter 112 and the second inclined filter 118 to prevent them from being directly mixed.
As shown in fig. 2, a plurality of openings 116 are provided on the neutralization tower 11, which correspond to the positions of the first activated carbon filter 111 and the second activated carbon filter 119, respectively, and a plurality of glass windows 115 for closing the openings 116 are rotatably connected to the outer wall of the neutralization tower 11; when it is necessary to replace each of the first activated carbon non-woven fabric 1111 and the second activated carbon non-woven fabric 1112, a worker may open the glass window 115 and then take out each of the first activated carbon non-woven fabric 1111 and the second activated carbon non-woven fabric 1112 from the opening 116 provided in the neutralization tower 11.
As shown in the combined fig. 1 and fig. 2, a plurality of lye conveying spray pipes 61 are distributed at the bottom of the neutralization tower 11, and two liquid discharge ports 117 corresponding to the inclined lower end positions of the first inclined filter screen 112 and the second inclined filter screen 118 are arranged on the outer wall of the neutralization tower 11; wherein, the liquid inlet of the alkali liquor water circulation tank 6 is respectively communicated with the liquid outlet 117 and the water outlet of the washing tower 5, and the liquid outlet of the alkali liquor water circulation tank 6 is respectively communicated with the water inlet of each alkali liquor conveying spray pipe 61 and the water inlet of the washing tower 5.
When the neutralization tower 11 works, the baking soda solution and the slaked lime solution which are respectively collected on the first inclined filter screen 112 and the second inclined filter screen 118 can flow back to the alkali liquor water circulation tank 6, the baking soda solution and the slaked lime solution react in the alkali liquor water circulation tank 6 to generate strong base, and the strong base is dissolved in water to produce alkali liquor, so that the alkali liquor concentration in the alkali liquor water circulation tank 6 is improved.
As shown in fig. 3, each of the slaked lime solution adding apparatus 13 and the baking soda solution adding apparatus 12 includes a support frame 121, a plurality of hoppers 122 fixed to an upper end of the support frame 121 for quantitatively charging the slaked lime powder or the baking soda powder, a stirrer 123 having an inlet port communicating with an outlet port of each hopper 122 and an inlet port communicating with an external water source for stirring the slaked lime powder or the baking soda powder, a hydraulic pump 124 having an inlet port and an outlet port communicating with the stirrer 123 and the neutralization tower 11, respectively, for feeding the slaked lime solution or the baking soda solution into the neutralization tower 11, and a screw lift 125 for transferring the slaked lime powder or the baking soda powder into the hoppers 122; wherein, the lower end of the spiral lifting device 125 is provided with a plurality of rollers 126, and the discharge port at the upper end of the spiral lifting device 125 extends to above the feed port of each quantitative hopper 122.
The automatic production and addition of the slaked lime solution and the baking soda solution can be accomplished by alternately supplying the mixer 123 with the slaked lime powder or the baking soda powder through the cooperation of the plurality of quantitative hoppers 122, then mixing the slaked lime powder or the baking soda powder with tap water using the mixer 123 to produce the slaked lime solution or the baking soda solution, and then injecting the slaked lime solution or the baking soda solution into the neutralization tower 11 using the hydraulic pump 124.
As shown in fig. 1, the bag-type dust collector assembly 4 includes two bag-type dust collectors 41 with air inlets communicated with the purified flue gas outlet of the flue gas heater 3, and the air outlets of the two bag-type dust collectors 41 are both communicated with the raw flue gas inlet of the flue gas heater 3; wherein, the air inlet and the air outlet of the two bag-type dust collectors 41 are both provided with valves 42. During normal work, only need through one of them sack cleaner 41 of valve 42 control switch on can, when damage appears in one of them sack cleaner 41, can block damaged sack cleaner 41 through the cooperation between each valve 42 to start another sack cleaner 41, can avoid sack cleaner 41 to the influence of gas cleaning system when damaging through above-mentioned cooperation.
As shown in fig. 1, a plurality of induced draft fans 71 are arranged on the chimney 7 at equal intervals along the height direction of the chimney 7, and air outlets of the induced draft fans 71 are communicated with the inside of the chimney 7, and air outlets of the induced draft fans 71 are arranged obliquely upward; wherein, still be provided with the third activated carbon filter screen 72 that the multi-disc is located each way draught fan 71 export below respectively in chimney 7, third activated carbon filter screen 72 can purify, filter the flue gas once more, but can influence the emission of flue gas, and at this moment, utilize each draught fan 71 can upwards extract the flue gas by force, ensure the emission of flue gas.
The working process of the invention is as follows:
when the pyrolysis gasification furnace burns hazardous wastes and generates flue gas, the flue gas is directly input into the neutralizing tower 11, at the moment, the flue gas can be sprayed by alkali liquor, filtered by activated carbon, neutralized by slaked lime solution and neutralized by baking soda, at the moment, acidic gases such as HF, HCl, NOx, SO2 and the like contained in the flue gas can be greatly reduced, and at the moment, the flue gas basically meets the standard limit value of hazardous waste incineration pollution control standard (solicited comments); the treated flue gas sequentially passes through a drying tower 2, a flue gas heater 3, a bag-type dust collector component 4 and a washing tower 5, and is finally discharged through a chimney 7, and when the treated flue gas passes through the equipment, harmful substances and dust contained in the flue gas can be further decomposed and filtered, so that the flue gas can completely meet the standard limit value of hazardous waste incineration pollution control standards (quotations).
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. The utility model provides a pyrolysis gasifier's gas cleaning system, is including neutralization tower (11), drying tower (2), sack cleaner (41), scrubbing tower (5) and chimney (7) that communicate the setting in proper order, its characterized in that: the device is characterized by further comprising a slaked lime solution adding device (13) and a baking soda solution adding device (12) with liquid outlets communicated with the top end of the neutralizing tower (11), wherein a first spraying shower head (113) and a second spraying shower head (114) which are respectively communicated with the slaked lime solution adding device (12) and the liquid outlets of the slaked lime solution adding device (13) are horizontally arranged in the neutralizing tower (11), the horizontal height of the first spraying shower head (113) is higher than that of the second spraying shower head (114), a first activated carbon filter screen (111) positioned between the first spraying shower head (113) and the second spraying shower head (114) and a second activated carbon filter screen (119) positioned below the second spraying shower head (114) are horizontally arranged in the neutralizing tower (11), and first activated carbon non-woven fabrics (1111) are paved on the upper surfaces of the first activated carbon filter screen (111) and the second activated carbon filter screen (119), the lower surfaces of the first activated carbon filter screen (111) and the second activated carbon filter screen (119) are both adhered with a second activated carbon non-woven fabric (1112) by magic tapes, the interior of the neutralization tower (11) is obliquely provided with a first inclined filter screen (112) positioned between the first activated carbon filter screen (111) and a second drain pipe, the interior of the neutralization tower (11) is also obliquely provided with a second inclined filter screen (118) positioned below the second activated carbon filter screen (119), the neutralization tower (11) is provided with two liquid discharge ports (117) which are respectively corresponding to the inclined lower end positions of the first inclined filter screen (112) and the second inclined filter screen (118), the neutralization tower (11) is externally provided with an alkali liquor water circulation pool (6) communicated with the two liquid discharge ports (117), the neutralization tower (11) is provided with a plurality of open ports (116) which are respectively corresponding to the positions of the first activated carbon filter screen (111) and the second activated carbon filter screen (119), the outer wall of the neutralization tower (11) is rotatably connected with a plurality of glass windows (115) which are respectively used for sealing each opening (116), a plurality of alkali liquor conveying spray pipes (61) are distributed on the inner wall of the bottom of the neutralization tower (11), and the liquid inlet ends of the alkali liquor conveying spray pipes (61) are communicated with the water outlet of the alkali liquor circulating pool (6).
2. A flue gas cleaning system for a pyrolysis gasifier according to claim 1, characterized in that: the slaked lime solution adding device (13) and the baking soda solution adding device (12) respectively comprise a support (121), a plurality of quantitative hoppers (122) fixed at the upper end of the support (121), a stirrer (123) with a feed inlet communicated with a discharge outlet of each quantitative hopper (122) and a water inlet communicated with an external water source, and a hydraulic pump (124) with a water inlet and a water outlet respectively communicated with the stirrer (123) and the neutralization tower (11).
3. A flue gas cleaning system for a pyrolysis gasifier according to claim 2, characterized in that: spiral lifting devices (125) are arranged on one sides of the slaked lime solution adding device (13) and the baking soda solution adding device (12), a plurality of rollers (126) are arranged at the lower ends of the two spiral lifting devices (125), and discharge ports at the upper ends of the two spiral lifting devices (125) extend to the upper parts of feed inlets of the quantitative hoppers (122).
4. A flue gas cleaning system for a pyrolysis gasifier according to claim 1, characterized in that: still including setting up flue gas heater (3) between drying tower (2) and sack cleaner (41), the former flue gas import of flue gas heater (3) and the gas vent intercommunication of drying tower (2), the steam outlet of flue gas heater (3) and the steam inlet intercommunication of pyrolysis gasifier system, the net flue gas export of flue gas heater (3) and the air inlet intercommunication of sack cleaner (41).
5. The flue gas purification system of a pyrolysis gasifier according to claim 4, wherein: the bag-type dust collector (41) is provided with two, two the air inlet of bag-type dust collector (41) all communicates with the gas outlet of drying tower (2), two the gas vent of bag-type dust collector (41) all communicates with the former flue gas import of flue gas heater (3), two all be provided with valve (42) on the air inlet of bag-type dust collector (41) and the gas vent.
6. A flue gas cleaning system for a pyrolysis gasifier according to claim 1, characterized in that: the chimney (7) is provided with a plurality of induced draft fans (71) which are arranged at equal intervals along the height direction of the chimney (7) and the air outlets of which are communicated with the inside of the chimney (7), and the air outlets of the induced draft fans (71) are inclined upwards.
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