CN110056882B - Molten salt garbage treatment system and method based on heat accumulating type combustion - Google Patents
Molten salt garbage treatment system and method based on heat accumulating type combustion Download PDFInfo
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- CN110056882B CN110056882B CN201910317435.1A CN201910317435A CN110056882B CN 110056882 B CN110056882 B CN 110056882B CN 201910317435 A CN201910317435 A CN 201910317435A CN 110056882 B CN110056882 B CN 110056882B
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 85
- 239000010813 municipal solid waste Substances 0.000 title claims abstract description 69
- 150000003839 salts Chemical class 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000000197 pyrolysis Methods 0.000 claims abstract description 56
- 238000002844 melting Methods 0.000 claims abstract description 55
- 230000008018 melting Effects 0.000 claims abstract description 55
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000003546 flue gas Substances 0.000 claims abstract description 39
- 238000003763 carbonization Methods 0.000 claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 16
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 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 claims abstract description 8
- 239000000779 smoke Substances 0.000 claims description 28
- 239000011833 salt mixture Substances 0.000 claims description 24
- 238000010000 carbonizing Methods 0.000 claims description 13
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- 239000000428 dust Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 230000001172 regenerating effect Effects 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- 239000002699 waste material Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 5
- 239000001110 calcium chloride Substances 0.000 claims description 5
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 5
- 238000009825 accumulation Methods 0.000 claims description 3
- 239000003517 fume Substances 0.000 claims description 3
- 239000002341 toxic gas Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims 1
- 238000010992 reflux Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 239000000446 fuel Substances 0.000 abstract description 3
- 238000002309 gasification Methods 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 239000010815 organic waste Substances 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 8
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- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 238000004056 waste incineration Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
- F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
- F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
- F23G5/165—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber arranged at a different level
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/30—Pyrolysing
- F23G2201/302—Treating pyrosolids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/30—Pyrolysing
- F23G2201/303—Burning pyrogases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2202/00—Combustion
- F23G2202/10—Combustion in two or more stages
- F23G2202/103—Combustion in two or more stages in separate chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2900/00—Special features of, or arrangements for incinerators
- F23G2900/50001—Combination of two or more furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2900/00—Special features of, or arrangements for incinerators
- F23G2900/50204—Waste pre-treatment by pyrolysis, gasification or cracking
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gasification And Melting Of Waste (AREA)
- Incineration Of Waste (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a fused salt garbage treatment system and method based on heat accumulating type combustion, the system comprises a fused salt furnace device (1), a garbage feeding circulating device (2), an ash collecting device (3), a flue gas treatment device (4), a flue gas conveying reflux device (5) and a heat accumulating type combustion device (6), the invention adopts heat accumulating type combustion to improve the energy utilization rate, in particular to the reasonable utilization of low-heat value fuel, thereby reducing the discharge of pollutants and saving energy, realizing the low-temperature pyrolysis or gasification of organic matters by using the fused salt as a pyrolysis medium, not only reducing the reaction energy consumption, but also reducing the cost and the loss of equipment, simultaneously reducing the pollution to the environment, adopting a double-channel structure to realize the absolute separation of the melting carbonization of organic wastes and the combustion of pyrolysis gas, inhibiting the generation of NOx and burning dioxin, green and environment-friendly, is favorable for environmental protection and has high garbage disposal efficiency.
Description
Technical Field
The invention relates to the technical field of garbage treatment, in particular to a fused salt garbage treatment system and method based on heat accumulating type combustion.
Background
The traditional garbage treatment modes in China are mainly three modes of landfill, incineration and composting, and the key targets of the treatment modes are reduction, recycling and harmless treatment of garbage. The garbage landfill operation is simple, secondary environmental pollution problems such as underground water and soil polluted by garbage leachate, odor generated by garbage stacking, combustible and explosive greenhouse gas methane and the like can be solved by establishing a high-level sanitary landfill plant, but the technology has large occupied area, large construction investment and high operating cost, most importantly, the landfill plant has limited treatment capacity, and after the service period expires, investment is still needed to construct a new landfill, so that land resources are further occupied; the advantages of volume reduction, decrement and harmless degree of waste incineration treatment are obvious, the energy of the waste can be realized by using heat generated in the incineration process for power generation, but flue gas pollution (particularly dioxin) can be caused by improper control of incineration conditions, so that the environmental problem is caused, and the equipment investment is huge; the garbage composting technology is simple in process, is suitable for treating garbage with high content of perishable organic matters, can utilize partial components in the garbage, greatly reduces the investment for treating the garbage with the same quality compared with the investment for treating the garbage by simple incineration treatment, but cannot treat organic matters and inorganic matters which cannot be rotted, and causes low volume reduction, decrement and harmless degree.
The garbage pyrolysis technology is one of the technologies different from the traditional garbage treatment modes, carries out anaerobic pyrolysis treatment on organic solid wastes in the garbage, not only has excellent cleanness, but also can obtain high-value clean fuel gas, simultaneously, no dioxin and acid gas are generated in the treatment process, and the garbage pyrolysis technology is not only suitable for centralized treatment of the household garbage in large cities, but also suitable for small-scale flexible treatment of the household garbage in small and medium cities and towns. The reduction, the recycling and the harmless treatment of the household garbage are realized on the key target of garbage treatment. However, the garbage pyrolysis process also has the following problems: firstly, the high-ash low-combustible garbage carbon treatment and dioxin control in the treatment process are difficult to realize; secondly, the dust-containing medium-temperature pyrolysis gas with high water content can not be effectively treated; and thirdly, the method is only suitable for treating the garbage with higher heat value.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a fused salt garbage treatment system and method based on heat accumulating type combustion.
The technical scheme adopted by the invention is as follows: a fused salt garbage treatment system based on heat accumulating type combustion comprises a fused salt furnace device 1, a garbage feeding circulating device 2, an ash collecting device 3, a smoke treatment device 4, a smoke conveying and returning device 5 and a heat accumulating type combustion device 6, wherein the fused salt furnace device 1 comprises a melting carbonization furnace 11 and a pyrolysis combustion furnace 12, the melting carbonization furnace 11 and the pyrolysis combustion furnace 12 are arranged in parallel, the front end and the rear end of the melting carbonization furnace are communicated with each other, heat-insulating walls are arranged outside the melting carbonization furnace 11 and the pyrolysis combustion furnace 12, a fused salt mixture is arranged inside the melting carbonization furnace 11, the temperature in the melting carbonization furnace 11 is 800-950 ℃, the temperature in the pyrolysis combustion furnace 12 is 1200-1400 ℃, the garbage feeding circulating device 2 comprises a screw feeder 21 and a circulating propelling rotating shaft 22, the screw feeder 21 is arranged at the front end of the melting carbonization furnace 11, and the screw feeder 21 feeds garbage into the melting, the circulating propulsion rotating shaft 22 is arranged in a furnace of the melting carbonization furnace 11, a stirring rod 23, an axial thrust blade 24 and a radial thrust blade 25 are arranged on the circulating propulsion rotating shaft 22, the circulating propulsion rotating shaft 22 stirs and mixes garbage and fused salt mixture to push the garbage and the fused salt mixture to circularly flow in the pyrolysis combustion furnace 12, the ash collecting device 3 is arranged at the rear end of the melting carbonization furnace 11 to collect carbon-fixed ash generated in the fused salt furnace device 1, the flue gas processing device 4 comprises a cyclone dust collector 41 and a plasma flue gas 42, the cyclone dust collector 41 carries out gas-solid separation processing on the flue gas, the plasma flue gas purifier 42 carries out oil-smoke separation processing on the flue gas, an air inlet of the flue gas processing device 4 is communicated with the melting carbonization furnace 11, the flue gas conveying and refluxing device 5 comprises a centrifugal fan 51 and an anti-tempering device 52, and the centrifugal fan 51 carries out exhaust, backflow conveying on the flue gas, the anti-backfire device 52 controls the flue gas to flow in a single direction to isolate flame propagation, the air inlet of the flue gas conveying and returning device 5 is communicated with the air outlet of the flue gas processing device 4, the air outlet of the flue gas conveying and returning device 5 is respectively communicated with the front end and the rear end of the pyrolysis combustion furnace 12, the heat accumulating type combustion device 6 comprises two heat accumulating chamber devices 61, a reversing valve device 62, an air blowing device 63 and a smoke exhaust device 64, the two heat accumulating chamber devices 61 are respectively communicated with the front end and the rear end of the pyrolysis combustion furnace 12, and the heat accumulating type combustion device 6 controls the pyrolysis combustion furnace 12 to.
In a further improvement, the molten salt mixture comprises the following components in parts by weight: 3-5 parts of sodium chloride and 5-7 parts of calcium chloride.
A molten salt garbage treatment method based on heat accumulating type combustion comprises the following steps:
step one, feeding garbage, namely, the garbage feeding and circulating device 2 feeds the garbage into a furnace of a melting and carbonizing furnace 11 in a timed, quantitative, continuous and uniform manner, fully and uniformly stirs the garbage and a molten salt mixture in the melting and carbonizing furnace 11 and uniformly mixes the garbage,
step two, melting and carbonizing, fully melting and carbonizing the garbage under the action of the molten salt mixture in the melting and carbonizing furnace 11 to generate smoke and carbide,
step three, flue gas treatment and backflow, wherein the flue gas flows back into the pyrolysis combustion furnace 12 through the cyclone dust collector 41, the plasma fume purifier 42, the centrifugal fan 51 and the anti-backfire device 52 in sequence under the blowing and sucking action of the centrifugal fan 51,
step four, carbide is circulated, the carbide circularly enters the pyrolysis combustion furnace 12 along with the flow of the molten salt mixture under the push of the garbage feeding and circulating device 2,
step five, heat accumulating type combustion, wherein the heat accumulating type combustion device 6 carries out heat accumulating type low-oxygen air combustion on the returned smoke and carbide in the pyrolysis combustion furnace 12, inhibits the generation of NOx, burns out toxic gases such as dioxin and the like, generates carbon-fixed ash and dischargeable gas,
and step six, collecting ash and discharging gas, wherein the ash and slag collecting device 3 collects carbon and solid ash and slag, and the dischargeable gas flows through the regenerator device 61 to be cooled and then is discharged from the smoke discharging device 64 through the reversing valve device 62.
Compared with the prior art, the invention has the following beneficial effects: adopt heat accumulation formula burning to improve energy utilization rate, especially to the rational utilization of low-heat value fuel, both reduced the emission of pollutant, the energy has been practiced thrift again, utilize fused salt to realize the low temperature pyrolysis or the gasification of organic matter as the pyrolysis medium, not only can reduce the reaction energy consumption, can also reduce the cost and the loss of equipment, reduce the pollution to the environment simultaneously, the absolute separation of organic waste melting carbonization and pyrolysis gas burning has been realized to adoption double-flow-passage structure smelting pot, can restrain NOx's formation and can burn out dioxin, green, be favorable to environmental protection, the refuse treatment is efficient.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.
As shown in fig. 1, a molten salt waste treatment system based on heat accumulating type combustion comprises a molten salt furnace device 1, a waste feeding circulation device 2, an ash slag collection device 3, a flue gas treatment device 4, a flue gas conveying reflux device 5 and a heat accumulating type combustion device 6, wherein the molten salt furnace device 1 comprises a melting carbonization furnace 11 and a pyrolysis combustion furnace 12, the melting carbonization furnace 11 and the pyrolysis combustion furnace 12 are arranged in parallel, the front end and the rear end of the melting carbonization furnace 11 and the front end of the pyrolysis combustion furnace 12 are communicated with each other, heat insulation walls are arranged outside the melting carbonization furnace 11 and the pyrolysis combustion furnace 12, a molten salt mixture is arranged inside the melting carbonization furnace 11, the furnace temperature of the melting carbonization furnace 11 is 800-950 ℃, the furnace temperature of the pyrolysis combustion furnace 12 is 1200-1400 ℃, the waste feeding circulation device 2 comprises a screw feeder 21 and a circulation propelling rotating shaft 22, the screw feeder 21 is arranged at the front end of, the circulating propulsion rotating shaft 22 is arranged in a furnace of the melting carbonization furnace 11, a stirring rod 23, an axial thrust blade 24 and a radial thrust blade 25 are arranged on the circulating propulsion rotating shaft 22, the circulating propulsion rotating shaft 22 stirs and mixes garbage and fused salt mixture to push the garbage and the fused salt mixture to circularly flow in the pyrolysis combustion furnace 12, the ash collecting device 3 is arranged at the rear end of the melting carbonization furnace 11 to collect carbon-fixed ash generated in the fused salt furnace device 1, the flue gas processing device 4 comprises a cyclone dust collector 41 and a plasma flue gas 42, the cyclone dust collector 41 carries out gas-solid separation processing on the flue gas, the plasma flue gas purifier 42 carries out oil-smoke separation processing on the flue gas, an air inlet of the flue gas processing device 4 is communicated with the melting carbonization furnace 11, the flue gas conveying and refluxing device 5 comprises a centrifugal fan 51 and an anti-tempering device 52, and the centrifugal fan 51 carries out exhaust, backflow conveying on the flue gas, the anti-backfire device 52 controls the flue gas to flow in a single direction to isolate flame propagation, the air inlet of the flue gas conveying and returning device 5 is communicated with the air outlet of the flue gas processing device 4, the air outlet of the flue gas conveying and returning device 5 is respectively communicated with the front end and the rear end of the pyrolysis combustion furnace 12, the heat accumulating type combustion device 6 comprises two heat accumulating chamber devices 61, a reversing valve device 62, an air blowing device 63 and a smoke exhaust device 64, the two heat accumulating chamber devices 61 are respectively communicated with the front end and the rear end of the pyrolysis combustion furnace 12, and the heat accumulating type combustion device 6 controls the pyrolysis combustion furnace 12 to.
In a further improvement, the molten salt mixture comprises the following components in parts by weight: 3-5 parts of sodium chloride and 5-7 parts of calcium chloride. Preferably, the melting point of sodium chloride is 801 ℃ and the boiling point of sodium chloride is 1465 ℃, the melting point of the molten salt mixture is lowered to 580 ℃ when the sodium chloride and the calcium chloride are mixed in a weight ratio of 4: 6 by using the calcium chloride as a fluxing agent, so that the temperature of the molten salt mixture in the melting carbonization furnace 11 can be controlled below 900 ℃.
The regenerative combustion technology is a technology of combustion under the condition of high temperature and low oxygen, the regenerative combustion technology fundamentally improves the energy utilization rate of the combustion furnace, especially the reasonable utilization of low-heat value fuel, not only reduces the discharge of pollutants, but also saves energy.
The molten salt has good heat storage capacity and high mass and heat transfer coefficients, can quickly and efficiently decompose organic matters, can absorb and convert harmful substances generated in the pyrolysis process, treats the garbage by using the molten salt, fully decomposes the garbage in the molten salt, thoroughly decomposes the organic matters, does not contain harmful gas in products, can be used as energy and synthesis gas, can realize low-temperature pyrolysis or gasification of the organic matters, can reduce reaction energy consumption, can also reduce the cost and the loss of equipment, and simultaneously reduces the pollution to the environment.
The molten salt furnace device 1 comprises a melting carbide furnace 11 and a pyrolysis combustion furnace 12, the melting carbide furnace 11 and the pyrolysis combustion furnace 12 are arranged in parallel, the front end and the rear end of the melting carbide furnace 11 are communicated with each other, a molten salt mixture is arranged inside the melting carbide furnace 11 and the pyrolysis combustion furnace 12, two regenerator devices 61 are respectively communicated with the front end and the rear end of the pyrolysis combustion furnace 12, the regenerative combustion device 6 controls the pyrolysis combustion furnace 12 to perform regenerative low-oxygen air combustion, the molten salt furnace with a double-channel structure of the melting carbide furnace 11 and the pyrolysis combustion furnace 12 realizes absolute separation of the dissolution carbonization of garbage organic matters and the combustion of pyrolysis gas, meanwhile, the pyrolysis combustion furnace 12 adopts regenerative low-oxygen air combustion, the average combustion temperature is 1200 ℃, the absolute separation is far larger than 850 ℃, the generation of NOx can be inhibited.
A molten salt garbage treatment method based on heat accumulating type combustion comprises the following steps:
step one, feeding garbage, namely, the garbage feeding and circulating device 2 feeds the garbage into a furnace of a melting and carbonizing furnace 11 in a timed, quantitative, continuous and uniform manner, fully and uniformly stirs the garbage and a molten salt mixture in the melting and carbonizing furnace 11 and uniformly mixes the garbage,
step two, melting and carbonizing, fully melting and carbonizing the garbage under the action of the molten salt mixture in the melting and carbonizing furnace 11 to generate smoke and carbide,
step three, flue gas treatment and backflow, wherein the flue gas flows back into the pyrolysis combustion furnace 12 through the cyclone dust collector 41, the plasma fume purifier 42, the centrifugal fan 51 and the anti-backfire device 52 in sequence under the blowing and sucking action of the centrifugal fan 51,
step four, carbide is circulated, the carbide circularly enters the pyrolysis combustion furnace 12 along with the flow of the molten salt mixture under the push of the garbage feeding and circulating device 2,
step five, heat accumulating type combustion, wherein the heat accumulating type combustion device 6 carries out heat accumulating type low-oxygen air combustion on the returned smoke and carbide in the pyrolysis combustion furnace 12, inhibits the generation of NOx, burns out toxic gases such as dioxin and the like, generates carbon-fixed ash and dischargeable gas,
and step six, collecting ash and discharging gas, wherein the ash and slag collecting device 3 collects carbon and solid ash and slag, and the dischargeable gas flows through the regenerator device 61 to be cooled and then is discharged from the smoke discharging device 64 through the reversing valve device 62.
In FIG. 1, the solid arrows indicate the direction of flow of the mixture of waste and molten salt, and the dashed arrows indicate the direction of flow of the flue gas.
Without being limited thereto, any changes or substitutions that are not thought of through the inventive work should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (3)
1. A fused salt garbage treatment system based on heat accumulating type combustion is characterized by comprising a fused salt furnace device (1), a garbage feeding circulating device (2), an ash collecting device (3), a smoke treatment device (4), a smoke conveying and returning device (5) and a heat accumulating type combustion device (6), wherein the fused salt furnace device (1) comprises a melting carbonization furnace (11) and a pyrolysis combustion furnace (12), the melting carbonization furnace (11) and the pyrolysis combustion furnace (12) are arranged in parallel, the front end and the rear end of the melting carbonization furnace are communicated with each other, heat-insulating walls are arranged outside the melting carbonization furnace (11) and the pyrolysis combustion furnace (12), a fused salt mixture is arranged inside the melting carbonization furnace (11), the furnace temperature of the pyrolysis combustion furnace (12) is 800-950 ℃, the furnace temperature of the pyrolysis combustion furnace (12) is 1200-1400 ℃, and the garbage feeding circulating device (2) comprises a spiral feeder (21) and a circulating propulsion rotating shaft (22), the spiral feeder (21) is arranged at the front end of the melting carbonization furnace (11), the spiral feeder (21) feeds garbage into the melting carbonization furnace (11), the circulating propulsion rotating shaft (22) is arranged in the melting carbonization furnace (11), the circulating propulsion rotating shaft (22) is provided with a stirring rod (23), an axial thrust blade (24) and a radial thrust blade (25), the circulating propulsion rotating shaft (22) stirs and mixes the garbage and the fused salt mixture to push the garbage and the fused salt mixture to circularly flow in the pyrolysis combustion furnace (12), the ash collecting device (3) is arranged at the rear end of the melting carbonization furnace (11) to collect carbon solid ash generated in the molten salt furnace device (1), the flue gas treatment device (4) comprises a cyclone dust collector (41) and a plasma oil smoke purifier (42), and the cyclone dust collector (41) performs gas-solid separation treatment on flue gas, the plasma oil smoke purifier (42) carries out oil smoke separation treatment on smoke, the air inlet of the smoke treatment device (4) is communicated with the melting carbonization furnace (11), the smoke conveying backflow device (5) comprises a centrifugal fan (51) and an anti-backfire device (52), the centrifugal fan (51) discharges, flows back and conveys the smoke, the anti-backfire device (52) controls the smoke to flow in one direction and isolates flame propagation, the air inlet of the smoke conveying backflow device (5) is communicated with the air outlet of the smoke treatment device (4), the air outlet of the smoke conveying backflow device (5) is respectively communicated with the front end and the rear end of the pyrolysis combustion furnace (12), the heat accumulating type combustion device (6) comprises two heat accumulation chamber devices (61), a reversing valve device (62), an air blowing device (63) and a smoke exhaust device (64), the two heat accumulation chamber devices (61) are respectively communicated with the front end and the rear end of the pyrolysis combustion furnace (, the heat accumulating type combustion device (6) controls the pyrolysis combustion furnace (12) to perform heat accumulating type low-oxygen air combustion.
2. The molten salt garbage treatment system based on regenerative combustion as claimed in claim 1, wherein the molten salt mixture comprises the following components in parts by weight: 3-5 parts of sodium chloride and 5-7 parts of calcium chloride.
3. A waste disposal method based on the regenerative combustion molten salt waste disposal system according to claim 1, comprising the steps of:
feeding garbage, namely feeding the garbage into a furnace of a melting carbonization furnace (11) by a garbage feeding circulating device (2) in a timed, quantitative, continuous and uniform manner, fully stirring and uniformly mixing the garbage and a molten salt mixture in the melting carbonization furnace (11),
secondly, melting and carbonizing, fully melting and carbonizing the garbage under the action of the molten salt mixture in the melting and carbonizing furnace (11) to generate smoke and carbide,
thirdly, flue gas treatment and backflow, wherein the flue gas flows back into the pyrolysis combustion furnace (12) through a cyclone dust collector (41), a plasma fume purifier (42), a centrifugal fan (51) and an anti-backfire device (52) in sequence under the blowing and sucking action of the centrifugal fan (51),
step four, carbide is circulated, the carbide circularly enters the pyrolysis combustion furnace (12) along with the flow of the molten salt mixture under the pushing of the garbage feeding circulation device (2),
step five, heat accumulating type combustion, wherein the heat accumulating type combustion device (6) carries out heat accumulating type low-oxygen air combustion on the return flue gas and the carbide in the pyrolysis combustion furnace (12), inhibits the generation of NOx, burns out toxic gases such as dioxin and the like, generates carbon clinker and exhaustible gas,
and sixthly, collecting ash and discharging gas, wherein the ash and slag collecting device (3) collects carbon and solid ash and slag, and the dischargeable gas flows through the regenerator device (61) to be cooled and then is discharged from the smoke discharging device (64) through the reversing valve device (62).
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| CN112063398A (en) * | 2020-09-29 | 2020-12-11 | 河南省正源环境科技有限公司 | Continuous pyrolysis device |
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