CN220635788U - Circulating decrement system for waste incineration fly ash - Google Patents
Circulating decrement system for waste incineration fly ash Download PDFInfo
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- CN220635788U CN220635788U CN202322229364.4U CN202322229364U CN220635788U CN 220635788 U CN220635788 U CN 220635788U CN 202322229364 U CN202322229364 U CN 202322229364U CN 220635788 U CN220635788 U CN 220635788U
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- fly ash
- incinerator
- ash
- tank
- hearth
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- 239000010881 fly ash Substances 0.000 title claims abstract description 77
- 238000004056 waste incineration Methods 0.000 title claims abstract description 7
- 238000002485 combustion reaction Methods 0.000 claims abstract description 39
- 239000002956 ash Substances 0.000 claims abstract description 25
- 239000000428 dust Substances 0.000 claims abstract description 15
- 239000000779 smoke Substances 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000002918 waste heat Substances 0.000 claims abstract description 11
- 239000010813 municipal solid waste Substances 0.000 claims description 21
- 238000009826 distribution Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 239000002893 slag Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 7
- 238000009792 diffusion process Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 238000010304 firing Methods 0.000 claims description 4
- 238000005496 tempering Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims 3
- 230000003750 conditioning effect Effects 0.000 abstract description 6
- 238000005245 sintering Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 11
- 239000003546 flue gas Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002920 hazardous waste Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000011066 ex-situ storage Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Gasification And Melting Of Waste (AREA)
Abstract
The utility model discloses a circulating decrement system for waste incineration fly ash, which comprises an incinerator, wherein a smoke outlet of the incinerator is connected with a waste heat exchange boiler, the smoke outlet of the waste heat exchange boiler is connected with a semi-dry tower, and the smoke outlet of the semi-dry tower is connected with a bag-type dust remover; the lower end of the semi-dry tower and the ash discharge port at the lower end of the bag-type dust collector are connected with ash tanks; the device comprises a conditioning agent tank and a forming tank, wherein the ash tank and the discharge port of the conditioning agent tank are both connected with the forming tank, the discharge port of the forming tank is connected with a conveying device, the conveying device is connected with the incinerator, and the fly ash returning position is positioned above a secondary air inlet pipe of a secondary combustion chamber; the utility model returns the modified and quenched fly ash to the mechanical grate incinerator, and uses the high-temperature environment of the incinerator to carry out sintering treatment, thereby greatly reducing the fly ash production and effectively reducing the fly ash treatment cost.
Description
Technical Field
The utility model relates to the technical field of household garbage treatment, in particular to a garbage incineration fly ash circulation decrement system.
Background
The fly ash from incineration of household garbage is a by-product in the production process of the household garbage incineration power plant, and is listed as dangerous waste by the national dangerous waste directory because the fly ash contains dioxin and heavy metals with certain concentration. The treatment and disposal modes of the fly ash of the current household garbage incineration power plant mainly comprise: 1) After stable solidification and maintenance in a factory, the fly ash is singly and sectionally landfilled in a sanitary landfill site after meeting the entrance requirement of domestic garbage incineration fly ash in domestic garbage landfill pollution control standard. 2) The hazardous waste treatment units with the hazardous waste treatment operation permit are subjected to treatment, including cement kiln cooperative treatment, safe landfill and the like. At present, a few new technologies for treating and disposing fly ash, such as ex-situ high-temperature melting, sintering and the like, but no mature and stable industrial application exists, and the feasibility of the technology is yet to be verified.
As disclosed in the publication CN210398933U, a garbage incinerator with oxygen-enriched combustion combined with fly ash recycling, comprising: an incinerator configured to incinerate refuse to generate flue gas; a primary air duct in communication with a bottom of the incinerator configured to provide primary air to the incinerator; an oxygen supply device in communication with the primary air conduit configured to supply oxygen to the incinerator; a fly ash collection device configured to collect fly ash in the flue gas; a fly ash recycling apparatus configured to send the collected fly ash to the incinerator.
The above-described scheme discloses that fly ash is fused and coagulated into large particles by recycling the fly ash, and the generation of the amount of fly ash is reduced, thereby reducing the cost of landfill fly ash generation, but has the drawbacks that: (1) When the fly ash enters the incinerator, the fly ash is in the form of small particles, part of the fly ash is easily suspended in the hearth under the influence of hot air, so that the fly ash is heated unevenly and is insufficiently sintered; (2) Most of the fly ash falls into a fixed position in the hearth during the return of the fly ash, and is easy to form accumulation in the hearth, so that the fly ash in the inner layer is insufficiently sintered.
Disclosure of Invention
The utility model aims at solving the problems in the prior art and provides a circulating decrement system for waste incineration fly ash, which is characterized in that after modification and tempering of the fly ash, the fly ash is returned to a mechanical grate incinerator, and is subjected to sintering treatment by utilizing the high-temperature environment of the incinerator, so that the fly ash production is greatly reduced, and the fly ash treatment cost is effectively reduced.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the system comprises an incinerator, wherein a smoke outlet of the incinerator is connected with a waste heat exchange boiler, a smoke outlet of the waste heat exchange boiler is connected with a semi-dry tower, and a smoke outlet of the semi-dry tower is connected with a bag-type dust remover; the lower end of the semi-dry tower and the lower end of the bag-type dust collector are respectively provided with an ash discharge port, and the ash discharge ports are respectively connected with an ash tank; the device comprises a conditioning agent tank and a forming tank, wherein the ash tank and the discharge port of the conditioning agent tank are both connected with the forming tank, the discharge port of the forming tank is connected with a conveying device, and the discharge port of the conveying device is connected with the incinerator.
The incinerator comprises a feed hopper, a hearth, a secondary combustion chamber and a slag discharge port; the bottom of the hearth is connected with a primary hot air pipe, the feed hopper is arranged at the front end of the hearth, the slag discharge port is arranged at the rear end of the hearth, the secondary combustion chamber is arranged above the hearth, the secondary combustion chamber is connected with a secondary air inlet pipe, and the secondary air inlet pipe is connected with a secondary air blower.
The front wall side wall of the secondary combustion chamber is connected with a material distribution pipe, one end of the material distribution pipe is connected with the conveying device, the material distribution pipe is connected with the secondary combustion chamber through a plurality of branch pipes, and the plurality of branch pipes are located above the secondary air inlet pipe.
The conveying device is a spiral conveying device, the spiral conveying device is connected with a preheating air pipe, and the preheating air pipe is connected with a primary hot air pipe of the incinerator.
The hearth comprises a drying section, a firing section, a combustion section and a burning-out section which are sequentially arranged in a downward inclined mode, wherein a plurality of diffusion hoppers are arranged on the lower side of the hearth and are respectively connected with the primary hot air pipes.
The ash tank and the discharge port of the conditioner tank are both connected with a stirring tank, and the stirring tank is connected with the forming tank.
Compared with the prior art, the utility model has the beneficial effects that:
the ash tank, the conditioner tank and the forming tank are arranged, the fly ash in the ash tank and the conditioner in the conditioner tank are sent into the forming tank to be mixed, the forming tank processes and forms the mixed fly ash into fly ash clusters, the fly ash is changed into pellets from powder, the fly ash is prevented from being blown and floated in a hearth after being put into an incinerator, the sintering process of the fly ash on a hearth is laminar combustion, the fly ash is heated uniformly and burnt stably, the fly ash generation amount is greatly reduced, and the fly ash treatment cost is effectively reduced;
through arranging the material distribution pipe, the fly ash block masses conveyed by the conveying device can be respectively thrown into the hearth along each branch pipe of the material distribution pipe, so that the fly ash return distribution is more uniform, and the accumulation in the hearth is avoided; through locating the branch pipe above the secondary air inlet pipe, the fly ash falls into the fire section of the hearth after being fully blown, mixed and stirred by the secondary air after entering the secondary combustion chamber, is fully stirred and mixed with the household garbage under the movement of the mechanical grate furnace, and is synchronous to the burnt garbage forward, and the fly ash is fully sintered through the high temperature environment maintained by the heat generated by the combustion of the garbage in the forward movement process through the combustion section and the burn-out section.
Drawings
FIG. 1 is a schematic diagram of a circulating reduction system for waste incineration fly ash;
FIG. 2 is a schematic view of the structure of the incinerator according to the present utility model;
in the figure: 1. a waste heat exchange boiler; 2. a semi-dry tower; 3. a bag-type dust collector; 4. an ash tank; 5. a forming tank; 6. a conveying device; 7. a feed hopper; 8. a secondary combustion chamber; 9. a slag discharge port; 10. a material distribution pipe; 11. a secondary air inlet pipe; 12. a drying section; 13. a firing section; 14. a combustion section; 15. a burn-out section; 16. a conditioner tank; 17. a stirring tank.
Detailed Description
The following description of the embodiments of the present utility model will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present utility model, are within the scope of the present utility model.
In the description of the present utility model, it should be noted that the terms "upper," "lower," "left," "right," "top," "bottom," "inner," "outer," "horizontal," "vertical," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not denote or imply that the apparatus or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
As shown in fig. 1 and 2, the circulating decrement system for the waste incineration fly ash comprises an incinerator, wherein a smoke outlet of the incinerator is connected with a waste heat exchange boiler 1, a smoke outlet of the waste heat exchange boiler 1 is connected with a semi-dry tower 2, and a smoke outlet of the semi-dry tower 2 is connected with a bag-type dust remover 3; the lower end of the semi-dry tower 2 and the lower end of the bag-type dust collector 3 are respectively provided with an ash discharge port, and the ash discharge ports are respectively connected with an ash tank 4; the device comprises a conditioning agent tank 16 and a forming tank 5, wherein the ash tank 4 and the discharge port of the conditioning agent tank 16 are both connected with the forming tank 5, the discharge port of the forming tank 5 is connected with a conveying device 6, and the discharge port of the conveying device 6 is connected with the incinerator.
The grab bucket puts the household garbage into the incinerator, the flue gas of the household garbage combustion upwards enters the waste heat exchange boiler 1, the waste heat exchange boiler 1 cools the flue gas and recycles the absorbed heat, the flue gas is sent into the semi-dry tower 2 after being cooled, the semi-dry tower 2 removes most harmful substances such as dioxin, heavy metal and sulfide in the flue gas, and filters part of fly ash, and the flue gas with the harmful substances removed is sent into the bag-type dust collector 3, the fly ash is filtered, and harmless flue gas is discharged.
The fly ash filtered in the semi-dry tower 2 and the cloth bag dust collector 3 is conveyed into the ash tank 4 for storage, the fly ash in the ash tank 4 and the modifying agent in the modifying agent tank 16 are conveyed into the forming tank 5 for mixing, the fly ash mixture is formed into fly ash clusters after standing and curing or extrusion forming in the forming tank 5, the fly ash clusters are conveyed into the incinerator by the conveying device 6 to be mixed with the household garbage entering later, combustion is carried out again, residual harmful substances in the fly ash clusters are fully decomposed at high temperature, and meanwhile, heavy metal substances in the fly ash clusters can be effectively converted into a residue state. The modifying agent is prepared from gelatinizer, flux and reducer (or combustion improver) in a certain proportion, and is used for reinforcing the viscosity of fly ash.
By arranging the ash tank 4, the conditioner tank 16 and the forming tank 5, the fly ash of the ash tank 4 and the conditioner in the conditioner tank 16 are sent into the forming tank 5 to be mixed, the forming tank 5 processes and forms the mixed fly ash into fly ash clusters, the fly ash is changed into a cluster shape from powder, the fly ash is prevented from being blown and floated in a hearth after being put into an incinerator, the sintering process of the fly ash falling on a hearth is laminar combustion, and the fly ash is heated uniformly and burnt stably.
The incinerator comprises a feed hopper 7, a hearth, a secondary combustion chamber 8 and a slag discharge port 9; the bottom of the hearth is connected with a primary hot air pipe, the feed hopper 7 is arranged at the front end of the hearth, the slag discharge port 9 is arranged at the rear end of the hearth, the secondary combustion chamber 8 is arranged above the hearth, the secondary combustion chamber 8 is connected with a secondary air inlet pipe 11, and the secondary air inlet pipe 11 is connected with a secondary air blower. The feed hopper 7 is used for receiving the feeding materials of the grab bucket, guiding the household garbage to the hearth, providing high-temperature and oxygen supply conditions for garbage combustion, the secondary combustion chamber 8 is used for carrying out secondary combustion on harmful gases such as carbon monoxide which are not completely combusted in the flue gas, so that the combustion is sufficient, the concentration of the harmful gases in the flue gas is reduced, and the slag discharge port 9 is used for discharging residual slag after combustion.
The front wall side wall of the secondary combustion chamber 8 is connected with a distributing pipe 10, one end of the distributing pipe 10 is connected with the conveying device 6, the distributing pipe 10 is connected with the secondary combustion chamber 8 through a plurality of branch pipes, and the plurality of branch pipes are positioned above the secondary air inlet pipe 11. By arranging the material distribution pipe 10, the fly ash blocks conveyed by the conveying device can be respectively thrown into the hearth along each branch pipe of the material distribution pipe 10, so that the fly ash return distribution is more uniform, and the accumulation in the hearth is avoided; through locating the branch pipe above the secondary air inlet pipe 11, the fly ash falls into the fire section of the hearth after being fully blown, mixed and stirred by the secondary air after entering the secondary combustion chamber 8, is fully stirred and mixed with household garbage under the movement of the mechanical grate furnace, and is synchronous to the burnt garbage to move forward, and the fly ash is fully sintered through the high temperature environment maintained by the heat generated by the combustion of the garbage in the forward movement process through the combustion section and the combustion section.
The conveying device 6 is a spiral conveying device, the spiral conveying device is connected with a preheating air pipe, the preheating air pipe can be connected with an additional hot air source, and the preheating air pipe can also be connected with a primary hot air pipe of the incinerator. By adopting a spiral conveying mode, quantitative conveying of fly ash clusters is convenient to control, and the influence of more or less one-time returning to the full sintering of the fly ash is avoided; through setting up the preheating air pipe, the hot-blast introduction spiral delivery mechanism in the furnace of incinerator makes hot-blast in spiral passageway inner chamber follow the flying dust and advances, and the flying dust group is heated by hot-blast in the transportation process at first, effectively promotes the going on of the solidification process of gelatinization in the flying dust group to reduce the maintenance time before the flying dust group goes into the stove.
The hearth comprises a drying section 12, a firing section 13, a combustion section 14 and a burning section 15 which are arranged in a downward inclined mode in sequence, a plurality of diffusion hoppers are arranged on the lower side of the hearth, and the diffusion hoppers are respectively connected with the primary hot air pipes. The hearth is obliquely downwards arranged, so that garbage sequentially passes through all the furnace layer sections under the influence of gravity, and primary air is distributed by adjusting the air inflow of each diffusion hopper, so that the firepower of each furnace layer section of the hearth is controlled; a large amount of fly ash is quenched and tempered and then returned to the incinerator to be converted into slag in a residue state, and the slag can be comprehensively utilized as general solid waste, so that the final production amount of the fly ash is greatly reduced.
The ash tank 4 and the discharge port of the conditioner tank 16 are both connected with a stirring tank 17, and the stirring tank 17 is connected with the forming tank 5.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The system is characterized by comprising an incinerator, wherein a smoke outlet of the incinerator is connected with a waste heat exchange boiler (1), a smoke outlet of the waste heat exchange boiler (1) is connected with a semi-dry tower (2), and a smoke outlet of the semi-dry tower (2) is connected with a cloth bag dust remover (3); the lower end of the semi-dry tower (2) and the lower end of the bag-type dust collector (3) are respectively provided with an ash discharge port, and the ash discharge ports are respectively connected with an ash tank (4); including tempering agent jar (16) and shaping jar (5), ash jar (4) with the discharge gate of tempering agent jar (16) all is connected shaping jar (5), conveyor (6) are connected to the discharge gate of shaping jar (5), the discharge gate of conveyor (6) is connected the incinerator.
2. The system for circularly reducing the fly ash from the garbage incineration according to claim 1, wherein the incinerator comprises a feed hopper (7), a hearth, a secondary combustion chamber (8) and a slag discharge port (9); the bottom of the hearth is connected with a primary hot air pipe, the feed hopper (7) is arranged at the front end of the hearth, the slag discharge port (9) is arranged at the rear end of the hearth, the secondary combustion chamber (8) is arranged above the hearth, the secondary combustion chamber (8) is connected with a secondary air inlet pipe (11), and the secondary air inlet pipe (11) is connected with a secondary air blower.
3. The waste incineration fly ash circulation decrement system according to claim 2, wherein a material distribution pipe (10) is connected to a front wall side wall of the secondary combustion chamber (8), one end of the material distribution pipe (10) is connected to the conveying device (6), the material distribution pipe (10) is connected to the secondary combustion chamber (8) through a plurality of branch pipes, and the plurality of branch pipes are located above the secondary air inlet pipe (11).
4. The system according to claim 1, characterized in that the conveyor (6) is a screw conveyor.
5. The system of claim 4, wherein the screw conveyor is connected with a preheating air duct, and the preheating air duct is connected with a hot air source.
6. The system according to claim 5, wherein the preheating air duct is connected to a primary air duct of the incinerator.
7. The system according to claim 2, wherein the hearth comprises a drying section (12), a firing section (13), a combustion section (14) and a burning section (15) which are arranged in a downward inclined manner in sequence, a plurality of diffusion hoppers are arranged on the lower side of the hearth, and the diffusion hoppers are respectively connected with the primary hot air pipes.
8. The system according to claim 2, characterized in that the discharge ports of the ash tank (4) and the conditioner tank (16) are both connected with a stirring tank (17), and the stirring tank (17) is connected with the forming tank (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322229364.4U CN220635788U (en) | 2023-08-18 | 2023-08-18 | Circulating decrement system for waste incineration fly ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322229364.4U CN220635788U (en) | 2023-08-18 | 2023-08-18 | Circulating decrement system for waste incineration fly ash |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220635788U true CN220635788U (en) | 2024-03-22 |
Family
ID=90267762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322229364.4U Active CN220635788U (en) | 2023-08-18 | 2023-08-18 | Circulating decrement system for waste incineration fly ash |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220635788U (en) |
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2023
- 2023-08-18 CN CN202322229364.4U patent/CN220635788U/en active Active
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