CN218645580U - Flue gas recirculation and SNCR coupling denitration system of special waste fluidized bed incinerator - Google Patents
Flue gas recirculation and SNCR coupling denitration system of special waste fluidized bed incinerator Download PDFInfo
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- CN218645580U CN218645580U CN202223105078.9U CN202223105078U CN218645580U CN 218645580 U CN218645580 U CN 218645580U CN 202223105078 U CN202223105078 U CN 202223105078U CN 218645580 U CN218645580 U CN 218645580U
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Abstract
The utility model relates to a flue gas recirculation and SNCR coupling denitration system of a special waste fluidized bed incinerator, which comprises an incinerator, an SNCR denitration section, a waste heat recovery section, a semi-dry deacidification section, a dedusting section and a chimney which are connected in sequence through pipelines, wherein a draught fan is arranged on the pipeline between the dedusting section and the chimney; the primary air chamber at the bottom of the incinerator is connected with a primary air input pipe, a primary air fan is installed on the primary air input pipe, and a circulating air pipe is connected between the air inlet side of the primary air fan and the air outlet side of the draught fan. The utility model has reasonable design, and a part of the treated flue gas is recycled as primary air to ensure that the dense-phase region is in a further anoxic state, thereby further inhibiting the generation of nitrogen oxide, further reducing the ammonia water consumption of a subsequent SNCR (selective non catalytic reduction) denitration system and reducing the escape of ammonia; meanwhile, the subsequent semidry deacidification section and the bag-type dust remover are matched, only solid dust is generated, wastewater and other wastes are not generated, the occupied area is small, and the process is simple.
Description
The technical field is as follows:
the utility model relates to a flue gas recirculation and SNCR coupling deNOx systems of special waste fluidized bed incinerator.
Background art:
the special waste fluidized bed incinerator is low in nitrogen oxide emission and complete in combustion, is expanded to the field of incineration of industrial waste, and can achieve the denitration effect by generally adopting an SNCR denitration mode. However, with the stricter and stricter environmental requirements, the use amount of ammonia water needs to be increased by adopting the SNCR denitration mode alone, so that the ammonia escape is increased, and the follow-up equipment is greatly damaged. If the SCR denitration mode is adopted, the cost is too high. If the calcium spraying in the furnace is adopted, the generation of partial nitrogen oxides is inhibited synergistically while the desulfurization is carried out in the furnace, and the generation amount of solid waste is increased.
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 flue gas recirculation and SNCR coupling deNOx systems of special waste fluidized bed incinerator are provided, reasonable in design ensures nitrogen oxide discharge to reach standard, and can reduce the quantity of aqueous ammonia, reduces the harm to equipment.
In order to realize the purpose, the utility model discloses a technical scheme is: a flue gas recirculation and SNCR coupling denitration system of a special waste fluidized bed incinerator comprises an incinerator, an SNCR denitration section, a waste heat recovery section, a semi-dry deacidification section, a dedusting section and a chimney which are sequentially connected through a pipeline, wherein an induced draft fan is installed on the pipeline between the dedusting section and the chimney; the primary air chamber at the bottom of the incinerator is connected with a primary air input pipe, a primary air fan is installed on the primary air input pipe, and a circulating air pipe is connected between the air inlet side of the primary air fan and the air outlet side of the draught fan.
Furthermore, a steam heat exchanger is arranged on the circulating air pipe.
Furthermore, control valves are respectively installed at two ends of the circulating air pipe.
Further, the dilute phase zone of the incinerator is connected with a 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 the sack cleaner, the input of sack cleaner is connected through the third pipeline and the upper end of deacidification tower, and the upper end of sack cleaner is connected with the chimney through the fourth pipeline, the draught fan is installed on the fourth pipeline.
Furthermore, a secondary air inlet is arranged on the periphery of the dilute phase area of the incinerator.
Further, denitration agent conveying mechanism includes aqueous ammonia storage tank, deoxidization water pitcher and mixing measurement distribution system, mixes measurement distribution system and carries to first spray gun after measuring the aqueous ammonia in the aqueous ammonia storage tank, the deoxidization water in the deoxidization water pitcher.
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.
Further, a superheater is arranged at the joint of the first pipeline and the dilute phase area of the incinerator.
Compared with the prior art, the utility model discloses following effect has: the utility model has reasonable design, and a part of treated flue gas is recycled as primary air to ensure that the dense phase region is in a further anoxic state and further inhibit the generation of nitrogen oxide, thereby reducing the ammonia water consumption of a subsequent SNCR denitration system and reducing the escape of ammonia; meanwhile, the subsequent semidry deacidification section and the bag-type dust remover are matched, only solid dust is generated, wastewater and other wastes are not 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", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1, the utility model relates to a flue gas recirculation and SNCR coupling deNOx systems of special waste fluidized bed incinerator, including incinerator 1, SNCR denitration section 2, waste heat recovery section 3, semidry deacidification section 4, dust removal section 5 and chimney 37 that loop through the pipeline and be connected, incinerator 1 includes primary plenum 6, dense phase district 7 and dilute phase district 8 that set gradually from bottom to top, install draught fan 36 on the pipeline between dust removal section 5 and chimney 37; a primary air chamber 6 at the bottom of the incinerator 1 is connected with a primary air input pipe 18, a primary air fan 21 is installed on the primary air input pipe 18, the primary air fan 21 conveys primary air into the primary air chamber of the incinerator 1 through the primary air input pipe 18, a circulating air pipe 22 is connected between the air inlet side of the primary air fan 21 and the air outlet side of a draught fan 36, the circulating air pipe forms a flue gas recirculation section, a part of processed clean flue gas is recirculated as primary air through the circulating air pipe 22, a dense-phase area is in a further anoxic state, generation of nitrogen oxides is further inhibited, and accordingly ammonia water consumption of a subsequent SNCR denitration system is reduced, and ammonia is reduced.
In this embodiment, the circulation duct 22 is provided with a steam heat exchanger 23. When the exhaust gas temperature is lower, the steam heat exchanger is started to ensure that the temperature of the recirculated flue gas is not lower than 110 ℃, so that the flue gas is prevented from corroding a pipeline due to condensation in the circulation process.
In this embodiment, in order to control the on/off of the circulating air duct, control valves 24 are respectively installed at two ends of the circulating air duct 22.
In this embodiment, 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 a first pipeline 9, the denitration agent conveying mechanism 10 is used for conveying a 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. The upper end of the bag-type dust collector 16 is connected with a chimney 37 through a fourth pipeline 25, the induced draft fan 36 is installed on the fourth pipeline 25, and the induced draft fan leads clean flue gas to the chimney for emission.
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 combusted completely under the action of the secondary air.
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, a superheater 38 is installed at the connection between the first pipeline 9 and the dilute 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 enters a primary air chamber 6 at the bottom of the incinerator 1 through a primary air input pipe 18, wherein one part of the primary air comes from air in a waste storage warehouse, the other part of the primary air comes from clean flue gas recycled by flue gas at the rear part of an induced draft fan 36, and the primary air is uniformly distributed through air caps 19 on air distribution plates of the primary air chamber 6 and then enters a dense-phase zone 7 of the incinerator to assist in incineration of waste. The dense phase zone is in an oxygen-deficient combustion state, and the generation of nitrogen oxides is inhibited. The unburnt part enters the rear dilute phase zone 8 and is completely combusted under the action of secondary air. Flue gas generated by combustion enters the SNCR denitration section 2 after passing through the heat exchanger 38, ammonia water from the ammonia water storage tank 26 and deoxygenated water from the deoxygenated water tank 27 are uniformly distributed by the mixing metering and distributing system 28 and then are sprayed into the flue gas through the first spray gun 11, and nitrogen oxides in the flue gas are removed. The flue gas enters a semi-dry deacidification section 4 after passing through a waste heat recovery section, and slaked lime from a slaked lime bin 29 is conveyed to an air conveying chute 30 through a feeding pump 32, is uniformly distributed through the chute 30 and then enters a 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. The sulfur dioxide and other acidic gases in the flue gas react with the slaked lime and the atomized water to achieve the effect of removing the acidic gases. The deacidified 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 16, and the clean flue gas enters a subsequent induced draft fan 36 and is led out. The solid smoke dust collected by the bag-type dust collector 16 enters an ash bin 39 at the lower part and is further disposed. A portion of the clean flue gas is discharged through a stack 37. Another portion of the clean flue gas is directed into the recirculation duct 22 and used as primary air. The circulating air pipe 22 is provided with a steam heat exchanger 23, when the exhaust gas temperature is lower, the steam heat exchanger is started to ensure that the temperature of the recirculated flue gas is not lower than 110 ℃, and the flue gas is prevented from corroding a pipeline due to condensation in the circulating process.
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 a bolt or screw connection) can also be 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 the preferred embodiments, those skilled in the art should understand that: the invention can be modified or equivalent substituted for some technical 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 flue gas recirculation and SNCR coupling deNOx systems of special waste fluidized bed incinerator, includes incinerator, SNCR denitration section, waste heat recovery section, semidry deacidification section, dust removal section and chimney that loop through the pipeline and be connected, its characterized in that: an induced draft fan is arranged on a pipeline between the dust removal section and the chimney; the primary air chamber at the bottom of the incinerator is connected with a primary air input pipe, a primary air fan is installed on the primary air input pipe, and a circulating air pipe is connected between the air inlet side of the primary air fan and the air outlet side of the draught fan.
2. The flue gas recirculation and SNCR-coupled denitration system of a special waste fluidized bed incinerator according to claim 1, characterized in that: and the circulating air pipe is provided with a steam heat exchanger.
3. The flue gas recirculation and SNCR-coupled denitration system of a special waste fluidized bed incinerator according to claim 1, characterized in that: and control valves are respectively arranged at two ends of the circulating air pipe.
4. The flue gas recirculation and SNCR-coupled denitration system of a special waste fluidized bed incinerator according to claim 1, characterized in that: the dilute phase zone 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 the sack cleaner, the input of sack cleaner is connected through the third pipeline and the upper end of deacidification tower, and the upper end of sack cleaner is connected with the chimney through the fourth pipeline, the draught fan is installed on the fourth pipeline.
5. The flue gas recirculation and SNCR-coupled denitration system of a special waste fluidized bed incinerator, as claimed in claim 4, wherein: and secondary air inlets are arranged on the periphery of the dilute phase area of the incinerator.
6. The flue gas recirculation and SNCR-coupled denitration system of a special waste fluidized bed incinerator, as claimed in claim 4, wherein: the denitration agent conveying mechanism comprises an ammonia water storage tank, a deoxygenation water tank and a mixing and metering distribution system, wherein the mixing and metering distribution system is used for mixing and metering ammonia water in the ammonia water storage tank and deoxygenation water in the deoxygenation water tank and then conveying the mixture to the first spray gun.
7. The flue gas recirculation and SNCR-coupled denitration system of a special waste fluidized bed incinerator according to claim 4, 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.
8. The flue gas recirculation and SNCR-coupled denitration system of a special waste fluidized bed incinerator, as claimed in claim 4, wherein: 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 is connected with the water tank through a water outlet pipe, and a water outlet pump is installed on the water outlet pipe.
9. The flue gas recirculation and SNCR-coupled denitration system of a special waste fluidized bed incinerator, as claimed in claim 4, wherein: and a superheater is arranged at the joint of the first pipeline and the dilute phase area of the incinerator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223105078.9U CN218645580U (en) | 2022-11-23 | 2022-11-23 | Flue gas recirculation and SNCR coupling denitration system of special waste fluidized bed incinerator |
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| CN202223105078.9U CN218645580U (en) | 2022-11-23 | 2022-11-23 | Flue gas recirculation and SNCR coupling denitration system of special waste fluidized bed incinerator |
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| CN218645580U true CN218645580U (en) | 2023-03-17 |
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| CN202223105078.9U Active CN218645580U (en) | 2022-11-23 | 2022-11-23 | Flue gas recirculation and SNCR coupling denitration system of special waste fluidized bed incinerator |
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