CN218763416U - In-furnace and after-furnace coupling desulfurization system of special waste fluidized bed incinerator - Google Patents
In-furnace and after-furnace coupling desulfurization system of special waste fluidized bed incinerator Download PDFInfo
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- CN218763416U CN218763416U CN202223108621.0U CN202223108621U CN218763416U CN 218763416 U CN218763416 U CN 218763416U CN 202223108621 U CN202223108621 U CN 202223108621U CN 218763416 U CN218763416 U CN 218763416U
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Abstract
The utility model relates to a coupling desulfurization system in and behind the stove of special waste fluidized bed incinerator, including incinerator, SNCR denitration section, waste heat recovery section, semidry deacidification section and dust removal section, the incinerator dense phase district is connected with limestone conveying mechanism, the incinerator dilute phase district is connected with the waste heat recovery section through first pipeline; the SNCR denitration section comprises a denitration agent conveying mechanism and a first spray gun, the first spray gun is arranged at the upper end of the first pipeline, and the denitration agent conveying mechanism conveys the denitration agent to the first spray gun; the semidry deacidification section comprises a deacidification tower connected with the waste heat recovery section, and the lower end of the deacidification tower is connected with a spraying mechanism and a slaked lime conveying mechanism; the dust removal section is a bag-type dust remover, and the input end of the bag-type dust remover is connected with the upper end of the deacidification tower through a third pipeline. Reasonable in design when realizing desulfurization system dual guarantee, reduces solid waste's production volume, and partly nitrogen oxide of concurrent control reduces follow-up SNCR system's aqueous ammonia quantity, reduces the degree of corrosion to equipment.
Description
The technical field is as follows:
the utility model relates to a special waste fluidized bed burns burning furnace's in-furnace and coupling desulfurization system behind the stove.
Background art:
the fluidized bed incinerator for special wastes is completely combusted due to low emission of nitrogen oxides, and is expanded to the field of incineration of industrial wastes. The special waste fluidized bed incinerator can adopt in-furnace desulfurization, and nitrogen oxides are cooperatively controlled while desulfurization is carried out. However, the use of limestone in the furnace for desulfurization increases the amount of auxiliary fuel, and generates a large amount of solid waste, which results in high cost. And with the stricter and stricter environmental protection requirements, the desulfurization in the furnace is cooperated to control the nitrogen oxide, so that the emission requirement of the nitrogen oxide can not be met. An SNCR denitration mode is required. In order to reduce the amount of solid waste generated, the amount of limestone added to the furnace must be reduced. If the mode of SNCR combined with desulphurization after the furnace is adopted, the consumption of ammonia water needs to be increased, the ammonia escape is increased, and the subsequent equipment is damaged greatly. If the SCR denitration mode is adopted, the cost is too high. At the moment, flue gas recirculation can be combined with SNCR coupling denitration, but due to site and space limitations, the flue gas recirculation system is not suitable for reconstruction.
The utility model has the following contents:
the utility model discloses make the improvement to the problem that above-mentioned prior art exists, promptly the utility model aims to solve the technical problem that a special waste fluidized bed burns burning furnace's in and coupling desulfurization system behind stove is provided, reasonable in design when realizing the dual guarantee of desulfurization system, reduces solid waste's production volume, and the while cooperative control is partly nitrogen oxide, reduces follow-up SNCR system's aqueous ammonia quantity, reduces the degree of corrosion to equipment.
In order to realize the purpose, the utility model discloses a technical scheme is: a coupling desulfurization system in and behind a furnace of a special waste fluidized bed incinerator comprises an incinerator, an SNCR denitration section, an afterheat recovery section, a semi-dry deacidification section and a dedusting section which are sequentially arranged, wherein a dense-phase area of the incinerator is connected with a limestone conveying mechanism, and a dilute-phase area of the incinerator is connected with the afterheat recovery section through a first pipeline; the SNCR denitration section comprises a denitration agent conveying mechanism and a plurality of first spray guns, the first spray guns are arranged at the upper end of the first pipeline, and the denitration agent conveying mechanism is used for conveying the denitration agent to the first spray guns; the semi-dry deacidification section comprises a deacidification tower, the bottom of the deacidification tower is connected with the waste heat recovery section through a second pipeline, and the lower end of the deacidification tower is connected with a spraying mechanism and a slaked lime conveying mechanism; the dust removal section is a bag-type dust remover, and the input end of the bag-type dust remover is connected with the upper end of the deacidification tower through a third pipeline.
Furthermore, a primary air chamber at the bottom of the incinerator is provided with a primary air inlet, and a secondary air inlet is arranged on the periphery of a dilute phase area of the incinerator.
Furthermore, a plurality of limestone spraying openings are formed in the periphery of the dense-phase area of the incinerator; the limestone conveying mechanism comprises a limestone bin and a Roots blower, an air outlet of the Roots blower is connected with a limestone injection port through a pneumatic conveying pipeline, and the limestone bin is communicated with the pneumatic conveying pipeline through a discharge pipe.
Further, denitration agent conveying mechanism includes aqueous ammonia storage tank, deoxidization water pitcher and mixing measurement distribution system, and mixing measurement distribution system carries to first spray gun after measuring the aqueous ammonia in the aqueous ammonia storage tank, the deoxidization water in the deoxidization water pitcher mixing.
Further, slaked lime conveying mechanism is located the below that sprays the mechanism, and slaked lime conveying mechanism includes slaked lime storehouse and air conveying chute, and the upper end of air conveying chute is connected with the deacidification tower, and the lower extreme of air conveying chute is connected with the slaked lime storehouse through the conveyer pipe, installs the delivery pump on the conveyer pipe.
Furthermore, the spraying mechanism comprises a water tank and a second spray gun, the second spray gun is installed on the side wall of the deacidification tower and connected with the water tank through a water outlet pipe, and a water outlet pump is installed on the water outlet pipe.
Furthermore, the upper end of the bag-type dust collector is connected with a chimney through an induced draft fan.
Furthermore, a superheater is arranged at the joint of the first pipeline and the dilute phase area of the incinerator.
Further, the lower end of the bag-type dust collector is provided with a dust storage bin.
Compared with the prior art, the utility model discloses following effect has: (1) The limestone desulfurization in the incinerator and the semi-dry desulfurization at the rear side of the incinerator are combined for use, so that the dual guarantee of a desulfurization system is realized, and the standard emission of sulfur dioxide can be ensured by incinerating waste with complex components; (2) By using a small amount of limestone in the incinerator, the generation of nitrogen oxides can be inhibited, the subsequent SNCR ammonia water consumption is reduced, the service life of subsequent equipment is prolonged, and the generation of solid wastes is reduced; (3) The semi-dry deacidification section and the bag-type dust collector are matched at the rear side of the incinerator, only solid waste is generated, no waste water is generated, the occupied area is small, and the process is simple.
Description of the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1, the utility model relates to a coupling desulfurization system in stove and behind stove of special waste fluidized bed incinerator, including incinerator 1, SNCR denitration section 2, waste heat recovery section 3, semi-dry deacidification section 4 and the dust removal section 5 that set gradually, incinerator 1 includes from the primary plenum 6 that sets gradually up from bottom to top, dense phase district 7 and dilute phase district 8, dense phase district 7 of incinerator is connected with limestone conveying mechanism, limestone conveying mechanism conveys a small amount of limestone to dense phase district, limestone is heated in dense phase district and is decomposed, produces calcium oxide and carbon dioxide, aggravate the oxygen deficiency combustion state in dense phase district, restrain the formation of nitrogen oxide, calcium oxide plays the effect of desorption part sulfur dioxide; the dilute phase zone 8 of the incinerator is connected with the waste heat recovery section 3 through a first pipeline 9; the SNCR denitration section 2 comprises a denitration agent conveying mechanism 10 and a plurality of first spray guns 11, the first spray guns 11 are arranged at the upper end of the first pipeline 9, the denitration agent conveying mechanism 10 is used for conveying the denitration agent to the first spray guns 11, and the first spray guns spray the vaporous denitration agent downwards to remove nitrogen oxides in flue gas; the semi-dry deacidification section 4 comprises a deacidification tower 13, the bottom of which is connected with the waste heat recovery section 3 through a second pipeline 12, the lower end of the deacidification tower 13 is connected with a spraying mechanism 14 and a slaked lime conveying mechanism 15, the spraying mechanism 14 sprays vaporous fresh water to the deacidification tower, the slaked lime conveying mechanism 15 conveys slaked lime to the deacidification tower, and acid gases such as sulfur dioxide in flue gas react with the slaked lime and atomized water to further remove the acid gases such as sulfur dioxide; the dust removal section 5 is a bag-type dust remover 16, the input end of the bag-type dust remover 16 is connected with the upper end of the deacidification tower 13 through a third pipeline 17, the desulfurized flue gas enters the bag-type dust remover, and solid smoke dust in the flue gas is removed through the bag-type dust remover.
In this embodiment, the primary air chamber at the bottom of the incinerator 1 is provided with a primary air inlet 18, the upper end of the primary air chamber is provided with an air distribution plate, and the air distribution plate is distributed with air caps 19. When the primary air incinerator works, primary air enters the primary air chamber from the primary air inlet, is uniformly distributed by the air caps on the air distribution plate and then enters the dense-phase area of the incinerator to assist in incineration of waste.
In this embodiment, a secondary air inlet 20 is provided around the dilute phase zone 8 of the incinerator, secondary air is supplied to the dilute phase zone of the incinerator through the secondary air inlet, and the unburned part of the incinerator enters the dilute phase zone and is further completely combusted under the action of the secondary air.
In this embodiment, a plurality of limestone injection ports 21 are arranged around the dense phase zone 7 of the incinerator; the limestone conveying mechanism comprises a limestone bin 22 and a Roots blower 23, an air outlet of the Roots blower 23 is connected with a limestone injection port 21 through a pneumatic conveying pipeline 24, and the limestone bin 22 is communicated with the pneumatic conveying pipeline 24 through a discharge pipe 25. During operation, the Roots blower is started, limestone in the limestone bin enters a pneumatic conveying pipeline through the discharge pipe, is conveyed to the limestone spraying port through the pneumatic conveying pipeline, and a small amount of limestone is sprayed into the dense-phase area of the incinerator.
In this embodiment, the denitration agent conveying mechanism 10 includes an ammonia water storage tank 26, a deoxygenated water tank 27 and a mixing and metering system 28, and the mixing and metering system 28 mixes and meters the ammonia water in the ammonia water storage tank 26 and the deoxygenated water in the deoxygenated water tank 27 and then conveys the mixture to the first spray gun 11. Preferably, the first spray gun may be a two-fluid spray gun. It should be noted that, the mixing, metering and distributing system is the prior art, and may directly adopt the SNCR mixing, metering and distributing device disclosed in CN201320009953, or may adopt a structure composed of a mixing cylinder and a metering pump, where the mixing cylinder mixes ammonia water and deoxygenated water, and then the ammonia water and deoxygenated water are metered by the metering pump and conveyed to the first spray gun, and here, the mixing, metering and distributing system is not described repeatedly.
In this embodiment, the slaked lime conveying mechanism 15 is located below the spraying mechanism 14, the slaked lime conveying mechanism includes a slaked lime bin 29 and an air conveying chute 30, the upper end of the air conveying chute 30 is connected with the deacidification tower, the lower end of the air conveying chute 30 is connected with the slaked lime bin 29 through a conveying pipe 31, and a feeding pump 32 is installed on the conveying pipe. When the lime slaker works, the lime slaker from the lime slaker bin is conveyed to the air conveying chute through the feeding pump, and enters the deacidification tower after being uniformly distributed through the air conveying chute.
In this embodiment, the spraying mechanism 14 includes a water tank and a second spray gun 33, the second spray gun 33 is installed on a side wall of the deacidification tower, the second spray gun 33 is connected with the water tank 35 through a water outlet pipe 34, and a water outlet pump is installed on the water outlet pipe 34. When the acid removal tower works, fresh water is arranged in the water tank, the water outlet pump pumps the fresh water in the water tank to the second spray gun, and the fresh water in the water tank is atomized by the second spray gun and then sprayed into the acid removal tower.
In this embodiment, the upper end of the bag-type dust collector 16 is connected with a chimney 37 through an induced draft fan 36, and the induced draft fan introduces clean flue gas to the chimney for emission.
In this embodiment, a superheater 38 is installed at the connection of the first conduit 9 and the lean phase zone 8 of the incinerator.
In this embodiment, the lower end of the bag-type dust collector is provided with a dust storage bin 39.
It should be noted that the waste heat recovery structure at the waste heat recovery section is a prior art, and it directly adopts the waste heat recovery structure on the existing incinerator.
The specific implementation process comprises the following steps: the primary air is uniformly distributed by the blast cap 19 on the air distribution plate and then enters the dense-phase zone 7 of the incinerator to assist in the incineration of the waste. Limestone enters the dense-phase zone 7 of the incinerator through limestone injection ports 21 distributed around the dense-phase zone 7 of the incinerator through a pneumatic conveying pipeline 24 under the action of a Roots blower 23. Limestone is heated and decomposed in the dense-phase zone to generate calcium oxide and carbon dioxide, the anoxic combustion state of the dense-phase zone is aggravated, the generation of nitrogen oxide is inhibited, and the calcium oxide plays a role in removing part of sulfur dioxide. The unburned portion in the incinerator enters into a dilute phase zone 8, and further completely burns under the action of secondary air. Flue gas that the burning produced gets into SNCR denitration section 2 behind the heat exchanger, and the aqueous ammonia that comes from aqueous ammonia storage tank 26 and the deoxidization water that comes from deoxidization water pitcher 27 spout into the flue gas through first spray gun 11 after mixing the ration distribution system 28 distribution is even, the nitrogen oxide in the desorption flue gas. The flue gas enters the semi-dry desulfurization section 4 after passing through the waste heat recovery section 3, and the slaked lime from the slaked lime bin 29 is conveyed to the air conveying chute 30 through the feeding pump 32, is uniformly distributed through the air conveying chute 30 and then enters the deacidification tower 13. Fresh water from the water tank 35 is atomized by the second spray gun 33 and sprayed into the deacidification tower 13, and acid gases such as sulfur dioxide in the flue gas react with slaked lime and atomized water to further remove the acid gases such as sulfur dioxide. The desulfurized flue gas enters a bag-type dust collector 16, solid smoke and dust in the flue gas are removed by the bag-type dust collector, and the clean flue gas is guided to a chimney 37 by an induced draft fan 36 to be discharged.
The utility model discloses if disclose or related to mutual fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.
The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: modifications can still be made to the embodiments of the invention or equivalents may be substituted for some of the features; without departing from the spirit of the technical solution of the present invention, the present invention should be covered by the technical solution of the present invention.
Claims (9)
1. The utility model provides a coupling desulfurization system behind stove in and of special waste fluidized bed incinerator, is including incinerator, SNCR denitration section, waste heat recovery section, semidry deacidification section and the dust removal section that sets gradually, its characterized in that: the dense-phase area of the incinerator is connected with a limestone conveying mechanism, and the dilute-phase area of the incinerator is connected with the waste heat recovery section through a first pipeline; the SNCR denitration section comprises a denitration agent conveying mechanism and a plurality of first spray guns, the first spray guns are arranged at the upper end of the first pipeline, and the denitration agent conveying mechanism is used for conveying the denitration agent to the first spray guns; the semi-dry deacidification section comprises a deacidification tower, the bottom of the deacidification tower is connected with the waste heat recovery section through a second pipeline, and the lower end of the deacidification tower is connected with a spraying mechanism and a slaked lime conveying mechanism; the dust removal section is a bag-type dust remover, and the input end of the bag-type dust remover is connected with the upper end of the deacidification tower through a third pipeline.
2. The in-furnace and after-furnace coupled desulfurization system of a special waste fluidized bed incinerator according to claim 1, characterized in that: a primary air chamber at the bottom of the incinerator is provided with a primary air inlet, and a secondary air inlet is arranged on the periphery of a dilute phase area of the incinerator.
3. The in-furnace and after-furnace coupled desulfurization system of a special waste fluidized bed incinerator according to claim 1, characterized in that: a plurality of limestone spraying openings are formed in the periphery of the dense-phase area of the incinerator; the limestone conveying mechanism comprises a limestone bin and a Roots blower, an air outlet of the Roots blower is connected with a limestone injection port through a pneumatic conveying pipeline, and the limestone bin is communicated with the pneumatic conveying pipeline through a discharge pipe.
4. The in-furnace and after-furnace coupled desulfurization system of a special waste fluidized bed incinerator according to claim 1, characterized in that: denitration agent conveying mechanism includes aqueous ammonia storage tank, deoxidization water pitcher and mixing measurement distribution system, and mixing measurement distribution system carries to first spray gun after measuring the aqueous ammonia in the aqueous ammonia storage tank, the deoxidization water in the deoxidization water pitcher mixing.
5. The in-furnace and after-furnace coupled desulfurization system of a special waste fluidized bed incinerator according to claim 1, characterized in that: the slaked lime conveying mechanism is located below the spraying mechanism and comprises a slaked lime bin and an air conveying chute, the upper end of the air conveying chute is connected with the deacidification tower, the lower end of the air conveying chute is connected with the slaked lime bin through a conveying pipe, and a feeding pump is installed on the conveying pipe.
6. The in-furnace and after-furnace coupled desulfurization system of a special waste fluidized bed incinerator according to claim 1, characterized in that: the spraying mechanism comprises a water tank and a second spray gun, the second spray gun is installed on the side wall of the deacidification tower and connected with the water tank through a water outlet pipe, and a water outlet pump is installed on the water outlet pipe.
7. The in-furnace and after-furnace coupled desulfurization system of a special waste fluidized bed incinerator according to claim 1, characterized in that: the upper end of the bag-type dust collector is connected with a chimney through an induced draft fan.
8. The in-furnace and after-furnace coupled desulfurization system of a special waste fluidized bed incinerator according to claim 1, characterized in that: and a superheater is arranged at the joint of the first pipeline and the dilute phase area of the incinerator.
9. The in-furnace and after-furnace coupled desulfurization system of a special waste fluidized bed incinerator according to claim 1, characterized in that: and the lower end of the bag-type dust collector is provided with a dust storage bin.
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|---|---|---|---|
| CN202223108621.0U CN218763416U (en) | 2022-11-23 | 2022-11-23 | In-furnace and after-furnace coupling desulfurization system of special waste fluidized bed incinerator |
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| CN202223108621.0U CN218763416U (en) | 2022-11-23 | 2022-11-23 | In-furnace and after-furnace coupling desulfurization system of special waste fluidized bed incinerator |
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| CN218763416U true CN218763416U (en) | 2023-03-28 |
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