CN216953078U - Flue gas treatment system for waste incineration - Google Patents
Flue gas treatment system for waste incineration Download PDFInfo
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- CN216953078U CN216953078U CN202122837806.4U CN202122837806U CN216953078U CN 216953078 U CN216953078 U CN 216953078U CN 202122837806 U CN202122837806 U CN 202122837806U CN 216953078 U CN216953078 U CN 216953078U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
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Abstract
The utility model discloses a flue gas treatment system for waste incineration, which comprises an incinerator, an electric dust removal device, a catalytic denitration device, a cloth bag dust removal device, a wet reaction tower device and a heat exchanger device, wherein the electric dust removal device is used for filtering dust in flue gas generated in the incinerator by incineration, the catalytic denitration device is reacted with the flue gas to remove nitrogen oxides, and the cloth bag dust removal device is used for removing dust again. The wet reaction tower device sprays alkali liquor to remove acidic substances, heavy metals and organic matters in the flue gas, and the heat exchanger device wraps a section of pipeline between the wet reaction tower device and a chimney; according to the utility model, the catalytic denitration device is arranged at the front end of the flue gas purification process, the denitration efficiency is improved by utilizing the temperature of the flue gas, and the flue gas reheating is avoided to reduce the energy consumption; the effect through sodium hydroxide solution in the wet process reaction tower device makes the deacidification efficiency of flue gas higher to heat wet process reaction tower device exhaust flue gas once more through the heat exchanger device, make the flue gas take off white, improve energy utilization.
Description
Technical Field
The application relates to the technical field of waste incineration treatment, in particular to a flue gas treatment system for waste incineration.
Background
The incineration power generation of the household garbage is the mainstream mode of municipal household garbage disposal at present. The flue gas purification process mainly purifies flue gas generated in the incineration process of garbage, and main pollutants in the flue gas can be divided into several categories such as dust (particulate matters), acid gases (HCl, HF, SOx, NOx and the like), heavy metals (Hg, Pb, Cr and the like), organic highly toxic pollutants (dioxin and the like) and the like.
At present, the technology which is applied more at home and abroad and has higher denitration efficiency is a Selective Catalytic Reduction (SCR) technology. The SCR technology is provided with a catalyst reaction tower, so that flue gas passes through a catalyst layer, ammonia water or urea is used as a reducing agent, selective reaction is carried out on NH3 and NOx on the surface of a catalyst, and the NOx in the flue gas is reduced into N2 and H2O, so that the aim of removing the NOx in the flue gas is fulfilled. The SCR catalyst is classified into a low temperature catalyst (reaction temperature about 180 ℃), a medium temperature catalyst (reaction temperature about 230 ℃), and a high temperature catalyst (reaction temperature about 300 ℃). The high-temperature catalyst has high denitration efficiency and wide application.
In the traditional flue gas purification device of the waste incineration power plant, the selective catalytic denitration device is arranged at the rear end of the flue gas purification process, the temperature of the flue gas after passing through the semidry method reaction tower and the wet method reaction tower is about 100-fold-150 ℃, the reaction temperature of the low-temperature catalyst of the selective catalytic denitration device is about 230 ℃, and the reaction temperature of the high-temperature catalyst is about 300-fold-400 ℃, so that the flue gas needs to be heated before entering the selective catalytic denitration device, the energy consumption is high, the medium-temperature or low-temperature catalyst is generally selected as the catalyst, and the denitration efficiency is low. The traditional flue gas deacidification purification device is generally a semi-dry method and a dry method, has lower efficiency than the wet type deacidification, and cannot meet the increasingly strict emission requirement.
At present, a flue gas heating device is required to be arranged in front of a selective catalytic denitration device in the traditional flue gas purification device, so that the energy consumption is high; deacidification efficiency among traditional flue gas purification device is low.
SUMMERY OF THE UTILITY MODEL
To the defect that exists among the prior art, the application provides a flue gas processing system for msw incineration to solve the leading heating of flue gas among the prior art and waste the energy and the problem under the deacidification efficiency.
The above purpose of the utility model is mainly realized by the following technical scheme:
a flue gas treatment system for waste incineration, comprising:
an incinerator.
And the electric dust removal device is communicated with the incinerator through a pipeline so as to filter dust in smoke generated by incineration in the incinerator.
And the catalytic denitration device is communicated with the electric dust removal device, and is internally provided with a catalyst layer used for reacting with nitrogen oxides in the flue gas so as to enable the flue gas to pass through the catalyst layer to remove the nitrogen oxides.
The bag-type dust collector is communicated with the catalytic pin removal device through a pipeline, and the flue gas passes through the bag-type dust collector to be separated and dedusted.
One end of the wet reaction tower device is communicated with the cloth bag dust removal device through a pipeline, the other end of the wet reaction tower device is connected with a chimney through a pipeline, and a sodium hydroxide solution for washing flue gas is arranged in the wet reaction tower device.
And the heat exchanger device is communicated between the cloth bag dust removal device and the cloth bag dust removal device, and a pipeline between the wet reaction tower device and the chimney is provided with a heat exchange section extending to the inside of the heat exchanger device.
Furthermore, the flue gas treatment system also comprises a waste heat boiler, wherein the waste heat boiler is arranged between the incinerator and the electric dust removal device and is used for absorbing heat carried by the flue gas discharged from the incinerator.
Further, the flue gas treatment system further comprises a smoke return channel, wherein the smoke return channel is communicated with and arranged between the cloth bag dust removal device and the incinerator, and a circulating fan is further arranged in the smoke return channel to drive the flue gas discharged from the cloth bag dust remover to enter the incinerator.
Further, the smoke return channel is arranged at the smoke outlet end of the cloth bag dust removal device.
Furthermore, a reducing agent is arranged on the catalyst layer, and the reducing agent adopts ammonia water or urea.
Further, the flue gas treatment system further comprises an economizer, the economizer is communicated and arranged between the catalytic denitration device and the bag-type dust collector, and the economizer absorbs the waste heat of the flue gas.
Furthermore, the flue gas treatment system also comprises a slaked lime injection device, and the slaked lime injection device is arranged between the economizer and the cloth bag dust removal device and is used for injecting slaked lime dry powder or sodium bicarbonate dry powder into the flue gas to generate a neutralization reaction.
Furthermore, the flue gas treatment system also comprises an active carbon injection device, wherein the active carbon injection device is arranged between the economizer and the cloth bag dust removal device and is used for injecting active carbon particles into the flue gas to filter the flue gas.
Furthermore, an exhaust fan for guiding the flue gas to exhaust to the chimney is arranged between the wet reaction tower device and the chimney.
Further, the heat exchange section is a spiral heat exchange section.
Compared with the prior art, the utility model has the advantages that:
the waste incineration is carried out in the incinerator, the flue gas generated in the incineration process is conveyed to the electric dust removal device communicated with the electric dust removal device, dust in the flue gas generated in the incinerator is filtered, and then the flue gas passes through the catalytic denitration device to reach the reaction temperature of the high-temperature catalyst, so that nitrogen oxides in the flue gas react with the catalyst layer, the denitration efficiency is high, and the purpose of removing the nitrogen oxides in the flue gas is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram provided in an embodiment of the present application;
in the figure: 1. an incinerator; 2. a waste heat boiler; 3. an electric dust removal device; 4. a catalytic denitration device; 5. a coal economizer; 6. a slaked lime injection device; 7. an activated carbon injection device; 8. a bag type dust collector; 9. a wet process reaction tower apparatus; 10. a heat exchanger device; 101. a heat exchange section; 11. a smoke return channel; 111. a circulating fan; 12. a chimney; 121. an exhaust fan.
Detailed Description
The utility model is further described with reference to the following figures and specific embodiments. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the utility model. This invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
As shown in fig. 1, a flue gas treatment system for waste incineration comprises an incinerator 1, an electric dust collector 3, a catalytic denitration device 4, a cloth bag dust collector 8, a wet reaction tower device 9 and a heat exchanger device 10.
Wherein, the incinerator 1 is provided with an incineration space, and the garbage generates smoke in the incineration process in the incineration space of the incinerator 1.
The catalytic denitration device 4 is communicated with the electric dust removal device 3, the flue gas filtered by the electric dust removal device 3 enters the catalytic denitration device 4, the catalytic denitration device 4 is internally provided with a catalyst layer, the reaction temperature is 300-500 ℃, the flue gas passes through the catalyst layer, and the selective reaction is carried out on the catalyst layer and the NOx in the flue gas, so that the NOx is reduced into N2 and H2O, and the aim of removing the NOx is fulfilled.
The cloth bag dust removal device 8 is communicated with the catalytic denitration device 4 through a pipeline, and the flue gas passing through the catalytic denitration device 4 passes through the cloth bag dust removal device 8 to complete further dust removal.
One end of the wet reaction tower device 9 is communicated with the cloth bag dust removal device 8 through a pipeline, the other end of the wet reaction tower device is connected with a chimney 12 through a pipeline, a sodium hydroxide solution for washing the flue gas is arranged inside the wet reaction tower device 9, and the acidic substances, such as HCl, HF, SOx and the like, heavy metals and organic matters in the flue gas are further removed by spraying an alkali liquor NaOH solution in a washing tower mode.
The heat exchanger device 10 is communicated between the bag-type dust collector device 8 and the wet reaction tower device 9, a pipeline between the wet reaction tower device 9 and the chimney 12 is provided with a heat exchange section 101 extending to the inside of the heat exchanger device 10, the heat exchanger device 10 is a gas-gas heat exchanger, namely GGH, and the heat energy of a flue gas pipeline at the inlet of the wet reaction tower device 9 is utilized to heat the flue gas at the outlet of the wet reaction tower device 9, so that the flue gas temperature is increased, the white smoke generation of the flue gas at the outlet of the exhaust funnel is controlled, and the energy utilization rate is increased.
The working principle of the embodiment is as follows: the waste incineration is carried out in the incinerator 1, the flue gas generated in the incineration process is conveyed to the electric dust removal device 3 communicated with the electric dust removal device, dust in the flue gas generated in the incinerator 1 by incineration is filtered, and then the flue gas passes through the catalytic denitration device 4, so that nitrogen oxides in the flue gas react with a catalyst layer, the purpose of removing the nitrogen oxides in the flue gas is achieved, the reacted flue gas passes through the cloth bag dust removal device 8 for dust removal, and then enters the wet reaction tower device 9, acidic substances such as HCl, HF and SOx, heavy metals and organic matters in the flue gas are further removed under the action of a sodium hydroxide solution, the deacidification efficiency of the flue gas is higher, the flue gas discharged by the wet reaction tower device 9 is heated again through the heat exchanger device 10, the temperature of the flue gas is increased, the white of the flue gas is removed, and the energy utilization rate is increased.
Further, the flue gas treatment system also comprises a waste heat boiler 2, wherein the waste heat boiler 2 is arranged between the incinerator 1 and the electric dust removal device 3, absorbs heat carried by the flue gas discharged from the incinerator 1, and finishes heat recovery generated in the incineration process.
Further, the flue gas treatment system further comprises a flue gas return channel 11, wherein the flue gas return channel 11 is communicated with and arranged between the bag-type dust removal device 8 and the incinerator 1, and a circulating fan 111 is further arranged in the flue gas return channel 11 to drive the flue gas discharged from the bag-type dust removal device to enter the incinerator 1.
Further, the smoke return channel 11 is arranged at the smoke outlet end of the cloth bag dust collector 8.
The flue gas at the outlet of the bag-type dust collector 8 is recycled into the incinerator 1 under the driving of the circulating fan 111 so as to adjust the temperature of the combustion chamber of the incinerator 1 and provide oxygen required for fully burning and burning out the garbage.
Furthermore, a reducing agent is arranged on the catalyst layer, and the reducing agent adopts ammonia water or urea.
Further, the flue gas treatment system further comprises an economizer 5, wherein the economizer 5 is communicated with and arranged between the catalytic denitration device 4 and the cloth bag dust removal device 8, the economizer 5 absorbs the waste heat of the flue gas, and the economizer 5 absorbs the waste heat of the flue gas to heat the boiler feed water.
Further, the flue gas treatment system also comprises a slaked lime injection device 6, wherein the slaked lime injection device 6 is arranged between the economizer 5 and the cloth bag dust removal device 8 and is used for injecting slaked lime dry powder or sodium bicarbonate dry powder into the flue gas to generate a neutralization reaction.
Further, the flue gas treatment system also comprises an activated carbon injection device 7, wherein the activated carbon injection device 7 is arranged between the economizer 5 and the cloth bag dust removal device 8 and is used for injecting activated carbon particles into the flue gas to filter the flue gas.
Further, an exhaust fan 121 for guiding the flue gas to the chimney 12 is disposed between the wet reaction tower apparatus 9 and the chimney 12.
Further, the heat exchange section 101 is a spiral heat exchange section 101, so that the contact area between the outer wall of the heat exchange section 101 and the flue gas is increased, and the heat transfer effect is improved.
It should be understood that the terms first, second, etc. are used merely for distinguishing between descriptions and are not intended to indicate or imply relative importance. Although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments of the present invention.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, B exists alone, and A and B exist at the same time, and the term "/and" is used herein to describe another association object relationship, which means that two relationships may exist, for example, A/and B, may mean: a alone, and both a and B alone, and further, the character "/" in this document generally means that the former and latter associated objects are in an "or" relationship.
It is to be understood that the terms "upper," "vertical," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship that is conventionally used for placing the disclosed articles of manufacture or that is conventionally understood by those skilled in the art, which is intended merely to facilitate the description of the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments of the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and/or groups thereof.
In the following description, specific details are provided to facilitate a thorough understanding of example embodiments. However, it will be understood by those of ordinary skill in the art that the example embodiments may be practiced without these specific details. In other instances, well-known processes, structures and techniques may be shown without unnecessary detail in order to avoid obscuring example embodiments.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A flue gas treatment system for waste incineration, characterized in that it includes:
an incinerator (1);
the electric dust removal device (3) is communicated with the incinerator (1) through a pipeline so as to filter dust in smoke generated by incineration in the incinerator (1);
the catalytic denitration device (4) is communicated with the electric dust removal device (3), and is internally provided with a catalyst layer for reacting with nitrogen oxides in the flue gas so as to remove the nitrogen oxides from the flue gas passing through the catalyst layer;
the cloth bag dust removal device (8) is communicated with the catalytic denitration device (4) through a pipeline, and the flue gas passes through the cloth bag dust removal device (8) to be separated and dedusted;
one end of the wet reaction tower device (9) is communicated with the cloth bag dust removal device (8) through a pipeline, the other end of the wet reaction tower device is connected with a chimney (12) through a pipeline, and a sodium hydroxide solution for washing flue gas is arranged inside the wet reaction tower device;
and the heat exchanger device (10) is communicated between the cloth bag dust removal device (8) and the wet reaction tower device (9), and a heat exchange section (101) extending to the inside of the heat exchanger device (10) is arranged on a pipeline between the wet reaction tower device (9) and the chimney (12).
2. The flue gas treatment system for waste incineration of claim 1, wherein: the flue gas treatment system further comprises a waste heat boiler (2), wherein the waste heat boiler (2) is arranged between the incinerator (1) and the electric dust removal device (3) and absorbs heat carried by the discharged flue gas in the incinerator (1).
3. The flue gas treatment system for waste incineration of claim 1, wherein: the flue gas treatment system further comprises a smoke return channel (11), wherein the smoke return channel (11) is communicated with and arranged between the cloth bag dust removal device (8) and the incinerator (1), and a circulating fan (111) is arranged in the smoke return channel (11) to drive flue gas discharged from the cloth bag dust removal device (8) to enter the incinerator (1).
4. The flue gas treatment system for waste incineration of claim 3, wherein: the smoke return channel (11) is arranged at the smoke outlet end of the cloth bag dust removal device (8).
5. The flue gas treatment system for waste incineration of claim 1, wherein: and a reducing agent is arranged on the catalyst layer, and the reducing agent adopts ammonia water or urea.
6. The flue gas treatment system for waste incineration of claim 1, wherein: the flue gas treatment system further comprises an economizer (5), wherein the economizer (5) is communicated with the catalytic denitration device (4) and the cloth bag dust removal device (8), and the economizer (5) absorbs the waste heat of the flue gas.
7. The flue gas treatment system for waste incineration of claim 6, wherein: the flue gas treatment system also comprises a slaked lime injection device (6), wherein the slaked lime injection device (6) is arranged between the economizer (5) and the cloth bag dust removal device (8) and is used for injecting slaked lime dry powder or sodium bicarbonate dry powder into the flue gas to generate a neutralization reaction.
8. The flue gas treatment system for waste incineration of claim 6, wherein: the flue gas treatment system further comprises an active carbon injection device (7), wherein the active carbon injection device (7) is arranged between the economizer (5) and the cloth bag dust removal device (8) and is used for injecting active carbon particles into the flue gas to filter the flue gas.
9. The flue gas treatment system for waste incineration of claim 1, wherein: an exhaust fan (121) for guiding the flue gas to exhaust to the chimney (12) is arranged between the wet reaction tower device (9) and the chimney (12).
10. The flue gas treatment system for waste incineration of claim 1, wherein: the heat exchange section (101) is a spiral heat exchange section (101).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122837806.4U CN216953078U (en) | 2021-11-12 | 2021-11-12 | Flue gas treatment system for waste incineration |
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| CN202122837806.4U CN216953078U (en) | 2021-11-12 | 2021-11-12 | Flue gas treatment system for waste incineration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117515584A (en) * | 2023-12-26 | 2024-02-06 | 华北电力大学 | Low-oxygen air distribution process for recycling flue gas and primary air of garbage incinerator |
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2021
- 2021-11-12 CN CN202122837806.4U patent/CN216953078U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117515584A (en) * | 2023-12-26 | 2024-02-06 | 华北电力大学 | Low-oxygen air distribution process for recycling flue gas and primary air of garbage incinerator |
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