CN111473352A - Purification and emission equipment for urban garbage incineration flue gas and purification treatment method thereof - Google Patents

Purification and emission equipment for urban garbage incineration flue gas and purification treatment method thereof Download PDF

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Publication number
CN111473352A
CN111473352A CN202010433524.5A CN202010433524A CN111473352A CN 111473352 A CN111473352 A CN 111473352A CN 202010433524 A CN202010433524 A CN 202010433524A CN 111473352 A CN111473352 A CN 111473352A
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China
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flue gas
heat exchange
dust collector
purification
dust remover
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Chinese (zh)
Inventor
朱文渊
李先旺
张前进
郭屹
高云云
蔡晨阳
刘良栋
王光坤
潘琛
雷琼
陈高
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Wuhan Dongyan Environmental Engineering Technology Co ltd
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Wuhan Dongyan Environmental Engineering Technology Co ltd
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Priority to CN202010433524.5A priority Critical patent/CN111473352A/en
Publication of CN111473352A publication Critical patent/CN111473352A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/38—Removing components of undefined structure
    • B01D53/40—Acidic components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75—Multi-step processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/80—Semi-solid phase processes, i.e. by using slurries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81—Solid phase processes
    • B01D53/83—Solid phase processes with moving reactants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
    • F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/006—Layout of treatment plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • B01D2258/0291—Flue gases from waste incineration plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/30—Halogen; Compounds thereof
    • F23J2215/301—Dioxins; Furans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00—Intercepting solids
    • F23J2217/10—Intercepting solids by filters
    • F23J2217/101—Baghouse type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00—Intercepting solids
    • F23J2217/10—Intercepting solids by filters
    • F23J2217/102—Intercepting solids by filters electrostatic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2219/00—Treatment devices
    • F23J2219/30—Sorption devices using carbon, e.g. coke
    • 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
    • Y02E20/30—Technologies for a more efficient combustion or heat usage

Abstract

The invention provides a purification and emission device for urban garbage incineration flue gas, which comprises an incinerator, a boiler, a spray tower, a composite dust remover, a first flue gas heat exchanger, a reactor, an acid removal tower, a dust remover and a chimney, wherein the first flue gas heat exchanger is arranged in the incinerator; burn burning furnace, boiler, spray tower, combined type dust remover, first gas heater, deacidification tower, dust remover and chimney and pass through the pipe connection, the reactor connect in on the first gas heater and with deacidification tower intercommunication, be provided with the sprayer on the boiler, be provided with the atomizer on the spray tower, be provided with the duster on the combined type dust remover. Through carrying out the heat transfer to the flue gas, thereby the rethread heater heats the flue gas and realizes that the flue gas denitration gets rid of the nitrogen oxide in the flue gas to spout activated carbon powder and can get rid of the dioxin in the flue gas in combined type dust remover, still spout soda powder and deacidify tower through the duster and get rid of the acid gas in the flue gas, be favorable to realizing having the super-clean emission of municipal waste incineration flue gas.

Description

Purification and emission equipment for urban garbage incineration flue gas and purification treatment method thereof
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of incineration flue gas purification equipment, in particular to purification and discharge equipment for urban garbage incineration flue gas and a purification treatment method thereof.
[ background of the invention ]
In the process of burning the urban garbage, various smoke pollutants such as nitric oxide, acid gas, heavy metal, dust, dioxin and the like can be generated, and especially the generation and emission of the dioxin are important influence factors for the construction and operation of the urban garbage burning project. Therefore, how to achieve ultra-clean emission in the process of incinerating the urban garbage is a key influence factor of safe and stable operation of the urban garbage incineration equipment, and the ultra-clean emission control of the multiple pollutants in the incineration flue gas is the requirement for realizing the coordinated development of economy, society and environment and the requirement for realizing the sustainable development of society per se.
At present, a purification system for urban waste incineration flue gas pollution is mainly formed by combining technologies such as SNCR denitration, semidry deacidification, activated carbon injection, cloth bag dust removal, wet deacidification and the like, and a primary purification system for urban waste incineration flue gas is formed. However, in the actual process of controlling the urban waste incineration flue gas, the problems of poor operation stability of the flue gas purification facility, difficulty in stable and continuous operation reaching the standard, lack of deep purification technology and equipment and the like still exist. In addition, because the garbage components are unstable and the operation load of the incinerator is unstable, the smoke components generated by incineration are relatively complex and unstable, and the great difficulty is caused to the incineration smoke emission management of the municipal refuse.
In view of the above, it is actually necessary to provide a new type of emission purification equipment for municipal waste incineration flue gas and a purification treatment method thereof to overcome the above-mentioned drawbacks.
[ summary of the invention ]
The invention aims to provide a purification and emission device and a purification treatment method for urban waste incineration flue gas, which can remove dioxin and acid gas in the flue gas and realize ultra-clean emission of the urban waste incineration flue gas.
In order to achieve the purpose, the invention provides a purification and emission device of urban garbage incineration flue gas, which comprises an incinerator 1, a boiler 2, a spray tower 3, a composite dust remover 4, a first flue gas heat exchanger 5, a reactor 6, a deacidification tower 7, a dust remover 8 and a chimney 9; burn burning furnace 1, boiler 2, spray tower 3, combined type dust remover 4, first gas heater 5, deacidification tower 7, dust remover 8 and chimney 9 and pass through the pipe connection, reactor 6 connect in on the first gas heater 5 and with deacidification tower 7 intercommunication, be provided with sprinkler 21 on the boiler 2, be provided with atomizer 31 on the spray tower 3, be provided with the duster on the combined type dust remover 4.
Preferably, the equipment for purifying and discharging the flue gas generated by the incineration of municipal refuse further comprises a secondary combustion chamber 10, and the secondary combustion chamber 10 is connected between the incinerator 1 and the boiler 2.
Preferably, the combined type dust collector 4 is an electric bag combined type dust collector and includes an electric dust collector 41 and a bag-type dust collector 42 connected to the electric dust collector 41, a carbon sprayer 43 is disposed between the electric dust collector 41 and the bag-type dust collector 42, and the carbon sprayer is disposed between the electric dust collector 41 and the bag-type dust collector 42.
Preferably, a recovery hopper 421 is further disposed on the bag-type dust collector 42.
Preferably, the equipment for purifying and discharging the flue gas generated by burning the municipal refuse further comprises a heater 11, and the first flue gas heat exchanger 5 comprises a first heat exchange cavity 51 and a second heat exchange cavity 52 isolated from the first heat exchange cavity 51; one end of the reactor 6 is connected to the first heat exchange cavity 51, the other end of the reactor 6 is connected to one end of the heater 11, the other end of the heater 11 is connected to one end of the second heat exchange cavity 52, and the second heat exchange cavity 52 is connected to the deacidification tower 7 through a pipeline.
Preferably, the purification and emission equipment for the municipal waste incineration flue gas further comprises a second flue gas heat exchanger 12, the second flue gas heat exchanger 12 comprises a third heat exchange cavity 121 and a fourth heat exchange cavity 122 isolated from the third heat exchange cavity 121, the third heat exchange cavity 121 is connected between the second heat exchange cavity 52 and the deacidification tower 7 through a pipeline, and the fourth heat exchange cavity 122 is connected between the dust remover 8 and the chimney (9) through a pipeline.
Preferably, the purification and emission equipment for the urban garbage incineration flue gas further comprises a draught fan 13, wherein the draught fan 13 is connected between the fourth heat exchange cavity 122 and the chimney 9.
Preferably, the incinerator 1 is provided with a feed hopper 111, and the boiler 2 is provided with an economizer.
A purification treatment method of a purification emission device of urban garbage incineration flue gas comprises the following steps,
s1: incinerating the municipal refuse in an incinerator 1, and fully combusting the incinerated municipal refuse in a secondary combustion chamber 11;
s2: introducing the flue gas of the secondary combustion chamber 11 into the boiler 2 for waste heat recovery, and spraying ammonia water in the process that the flue gas from the secondary combustion chamber 11 enters the boiler 2;
s3: introducing the flue gas in the boiler 2 into a spray tower 3, and spraying lime slurry through a sprayer 31 on the spray tower 3 to react with acid gas in the flue gas to generate a solid substance;
s4: firstly, introducing the flue gas of the spray tower 3 into an electric dust remover 41 of a composite dust remover 4, removing dust in the flue gas through the electric dust remover 41, enabling the residual dust to enter a bag-type dust remover 42 of the composite dust remover 4, then spraying activated carbon powder to absorb dioxin in the flue gas through a carbon sprayer 43, spraying soda ash into the bag-type dust remover 42 through the powder sprayer, filtering the residual dust and the sprayed activated carbon powder through the bag-type dust remover 42, and discharging the filtered flue gas through the bag-type dust remover 42;
s5: firstly, introducing flue gas of a bag-type dust collector 42 into a first heat exchange cavity 51 of a first flue gas heat exchanger 5, heating the flue gas in the first heat exchange cavity 51, then heating the flue gas in a reactor 6 and a heater 11 by the heater 11, carrying out denitration and purification on the flue gas in the reactor 6, and cooling the flue gas discharged from the reactor 6 in a second heat exchange cavity 52 of the first flue gas heat exchanger 5;
s6: the flue gas of the second heat exchange cavity 62 of the first flue gas heat exchanger 6 is introduced into the third heat exchange cavity 121 of the second flue gas heat exchanger 12 and the deacidification tower 7;
s7: the flue gas in the deacidification tower 7 is introduced into the dust remover 8 for cooling, the flue gas in the dust remover 8 enters the fourth heat exchange cavity 122 of the second flue gas heat exchanger 12 for heat exchange, and finally the flue gas is discharged into the atmosphere through the chimney 9.
Preferably, the temperature range after the lime slurry reacts with the acid gas in the flue gas to generate the solid is 160-180 ℃, the temperature of the flue gas in the bag-type dust collector is 160 ℃, the temperature of the flue gas heated in the first heat exchange cavity 51 is 190 ℃, the temperature of the flue gas heated in the reactor 6 and the heater 11 is 210 ℃, the temperature of the flue gas entering the second heat exchange cavity 52 of the first flue gas heat exchanger 5 is reduced to 190 ℃, the temperature of the flue gas in the deacidification tower 7 after being introduced into the dust collector 8 is reduced to 60 ℃ in the dust collector 8, and the temperature of the flue gas in the dust collector 8 after being introduced into the fourth heat exchange cavity 122 of the second flue gas heat exchanger 12 for heat exchange is 90 ℃.
Compared with the prior art, the purification and emission equipment for the municipal refuse incineration flue gas and the purification treatment method thereof provided by the invention have the beneficial effects that: through carrying out the heat transfer to the flue gas, thereby the rethread heater heats the flue gas and realizes that the flue gas denitration gets rid of the nitrogen oxide in the flue gas to spout activated carbon powder and can get rid of the dioxin in the flue gas in the combined type dust remover, still spout soda powder and deacidify tower through the duster and get rid of the acid gas in the flue gas, be favorable to realizing having the ultra-clean emission of municipal waste incineration flue gas, reach the standard of the ultralow emission of municipal waste incineration flue gas.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of the municipal refuse incineration flue gas purification and discharge equipment provided by the invention.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantageous effects of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and are therefore not to be considered limiting.
It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. To those of ordinary skill in the art, the above terms may be specifically defined in the present invention according to the specific circumstances.
Furthermore, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", may explicitly or implicitly include one or more of that feature. Further, the meaning of "a plurality" or "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, the present invention provides a purification and emission device for flue gas from municipal solid waste incineration, which includes an incinerator 1, a boiler 2, a spray tower 3, a composite dust remover 4, a first flue gas heat exchanger 5, a reactor 6, a deacidification tower 7, a dust remover 8 and a chimney 9; the incinerator 1, the boiler 2, the spray tower 3, the combined type dust remover 4, the first flue gas heat exchanger 5, the deacidification tower 7, the dust remover 8 and the chimney 9 are sequentially connected through a pipeline, the reactor 6 is connected to the first flue gas heat exchanger 5 and communicated with the deacidification tower 7, the boiler 2 is provided with a water sprayer 21, the spray tower is provided with a sprayer, and the combined type dust remover is provided with a powder sprayer;
the incinerator 1 is used for incinerating municipal refuse; the boiler 2 is used for recovering waste heat of the flue gas from the incinerator 1 and spraying ammonia water through the water sprayer 21 to enable nitrogen oxides (such as nitric oxide and nitrogen dioxide) in the flue gas to react with the ammonia water; the spray tower 3 is used for spraying lime slurry to enable flue gas from the boiler 2 to enter the spray tower 3 to react with the lime slurry to generate solid substances (such as CaCl2, CaF2, CaSO4 & 0.5H 2O); the combined dust remover 4 is used for removing dust from the flue gas from the spray tower 3 and spraying soda ash through the powder sprayer, so that the soda ash and the flue gas react to remove acid gas in the flue gas; the first flue gas heat exchanger 5 is used for heating flue gas; the reactor 6 is used for carrying out denitration and purification on the flue gas from the first flue gas heat exchanger 5 so as to remove nitrogen oxides in the flue gas; the deacidification tower 7 is used for further removing acid gases and metal particles in the flue gas so as to facilitate the ultra-clean emission of the flue gas; the dust remover 8 is used for removing fog drops and dust in the flue gas so as to effectively remove the dust; the chimney 9 is used for discharging flue gas.
In this embodiment, the boiler 2 is a waste heat boiler, the spray tower 3 is a rotary spray tower, the reactor 6 is an SCR denitration reactor, and the dust remover 8 is a wet-type electric dust remover.
Further, a feed hopper 111 is arranged on the incinerator 1, and municipal refuse enters the incinerator 1 through the feed hopper 111.
Further, an economizer is arranged on the boiler 2, and flue gas in the boiler 2 is introduced into the spray tower 3 through the economizer.
Further, the equipment for purifying and discharging the urban garbage incineration flue gas further comprises a secondary combustion chamber 10, wherein the secondary combustion chamber 10 is connected between the incinerator 1 and the boiler 2, and the secondary combustion chamber 10 is used for fully combusting the flue gas from the incinerator 1 and combusting and burning dioxin in the secondary combustion chamber 10.
Further, the combined type dust collector 4 is an electric bag combined type dust collector and comprises an electric dust collector 41 and a bag-type dust collector 42 connected with the electric dust collector 41, a carbon sprayer 43 is arranged between the electric dust collector 41 and the bag-type dust collector 42, and the carbon sprayer is arranged between the electric dust collector 41 and the bag-type dust collector 42. Dust in the flue gas enters the electric dust collector 41, the dust in the flue gas is removed through the electric dust collector 41, the residual dust enters the bag-type dust collector 42, the carbon sprayer 43 between the electric dust collector 41 and the bag-type dust collector 42 sprays activated carbon powder, so that the activated carbon can be effectively contacted with residual dioxin in the flue gas, the dioxin in the flue gas can be effectively absorbed, meanwhile, the powder sprayer sprays soda powder in the bag-type dust collector 42 to enable the soda powder to react with the flue gas to remove acid gas in the flue gas, in addition, the bag-type dust collector 42 effectively filters the residual dust and the sprayed activated carbon powder, and the filtered flue gas is discharged through the bag-type dust collector 42.
Specifically, the bag-type dust collector 42 is further provided with a recovery hopper 421 for recovering activated carbon powder, and the recovery hopper 421 is connected with the carbon sprayer 43 through a pipeline. Therefore, the activated carbon powder recovered from the recovery hopper 421 of the bag-type dust collector 42 can be conveniently sprayed into the bag-type dust collector 42 together with the newly added activated carbon powder through the pipeline, so that the activated carbon powder is recycled, and the use cost is saved.
Further, the equipment for purifying and discharging the flue gas generated by burning the municipal refuse further comprises a heater 11, and the first flue gas heat exchanger 5 comprises a first heat exchange cavity 51 and a second heat exchange cavity 52 isolated from the first heat exchange cavity 51; one end of the reactor 6 is connected to the first heat exchange cavity 51, the other end of the reactor 6 is connected to one end of the heater 11, the other end of the heater 11 is connected to one end of the second heat exchange cavity 52, and the second heat exchange cavity 52 is connected to the deacidification tower 7 through a pipeline. Therefore, the flue gas with the temperature of 160 ℃ coming out of the bag-type dust collector 42 enters the first heat exchange cavity 51 of the first flue gas heat exchanger 5 through a pipeline, the flue gas is heated to 190 ℃ in the first heat exchange cavity 51, then the flue gas enters the reactor 6 and the heater 11 and is heated to 210 ℃ by the heater 11, at the moment, the flue gas is subjected to denitration purification in the reactor 6(SCR denitration reactor) to remove nitrogen oxides in the flue gas, and the temperature of the flue gas with the temperature of 210 ℃ coming out of the reactor 6 enters the second heat exchange cavity 52 of the first flue gas heat exchanger 5 and is reduced to 190 ℃.
Further, the purification and emission equipment for the urban waste incineration flue gas further comprises a second flue gas heat exchanger 12, the second flue gas heat exchanger 12 comprises a third heat exchange cavity 121 and a fourth heat exchange cavity 122 isolated from the third heat exchange cavity 121, the third heat exchange cavity 121 is connected between the second heat exchange cavity 52 and the deacidification tower 7 through a pipeline, and the fourth heat exchange cavity 122 is connected between the dust remover 8 and the chimney 9 through a pipeline. Therefore, the flue gas with the temperature of 190 ℃ coming out of the second heat exchange cavity 52 of the first flue gas heat exchanger 5 enters the third heat exchange cavity 121 of the second flue gas heat exchanger 12 and the deacidification tower 7 through the pipeline to further remove acidic gas and metal particles in the flue gas in the deacidification tower 7, the temperature of the flue gas coming out of the deacidification tower 7 after entering the dust remover 8 (wet electric dust remover) through the pipeline is reduced to 60 ℃ in the dust remover 8, at the moment, the dust remover 8 removes fog drops and dust in the flue gas, the flue gas with the temperature of 60 ℃ in the dust remover 8 enters the fourth heat exchange cavity 122 of the second flue gas heat exchanger 12 through the pipeline to exchange heat, and the temperature of the flue gas after heat exchange is 90 ℃. In addition, the corrosion degree of the chimney 9 can be effectively reduced by increasing the temperature of the flue gas.
Further, the purification emission equipment of municipal waste incineration flue gas still includes draught fan 13, draught fan 13 connect in fourth heat transfer chamber 122 with between the chimney 9, through draught fan 13 pressurizes the back and sends into in the chimney 9 and discharge in the atmosphere in order to realize the fume emission. In addition, the corrosion degree of the induced draft fan 13 can be effectively reduced by increasing the temperature of the flue gas.
A purification treatment method of a purification emission device of urban garbage incineration flue gas comprises the following steps,
s1: incinerating the municipal refuse in an incinerator 1, wherein the incinerated municipal refuse is fully combusted in a secondary combustion chamber 11 so as to burn and incinerate dioxin generated in the incineration process of the municipal refuse in the secondary combustion chamber 11;
s2: introducing the flue gas of the secondary combustion chamber 11 into a boiler 2 (waste heat boiler) through a pipeline for waste heat recovery and utilization, and spraying ammonia water to react with nitrogen oxides in the flue gas in the process that the flue gas from the secondary combustion chamber 11 enters the boiler 2 so as to remove partial nitrogen oxides in the flue gas;
s3: introducing the flue gas in the boiler 2 into a spray tower 3 through a pipeline by an economizer on the boiler 2, spraying lime slurry through a sprayer 31 on the spray tower 3 to react with the acid gas in the flue gas to generate solid substances (such as CaCl2, CaF2, CaSO4 & 0.5H2O), thereby achieving the purpose of removing the acid gas in the flue gas again and controlling the temperature of the flue gas at 160-;
s4: firstly, the flue gas of the spray tower 3 is introduced into an electric dust collector 41 of a composite dust collector 4 through a pipeline, the dust in the flue gas is removed through the electric dust collector 41, the residual dust enters a bag-type dust collector 42 of the composite dust collector 4, then activated carbon powder is sprayed into the flue gas through a carbon spraying device 43 to absorb dioxin in the flue gas, sodium bicarbonate powder is sprayed into the bag-type dust collector 42 through the powder spraying device to react with the flue gas so as to remove acid gas in the flue gas, the residual dust and the sprayed activated carbon powder are effectively filtered by the bag-type dust collector 42, and the filtered flue gas is discharged through the bag-type dust collector 42;
s5: firstly, introducing flue gas with the temperature of 160 ℃ of a bag-type dust collector 42 into a first heat exchange cavity 51 of a first flue gas heat exchanger 5 through a pipeline, heating the flue gas to 190 ℃ in the first heat exchange cavity 51, then introducing the flue gas into a reactor 6 and a heater 11 to be heated to 210 ℃ by the heater 11, carrying out denitration purification on the flue gas in the reactor 6(SCR denitration reactor) to remove nitrogen oxides in the flue gas, and reducing the temperature of the flue gas with the temperature of 210 ℃ coming out of the reactor 6 into a second heat exchange cavity 52 of the first flue gas heat exchanger 5 to 190 ℃;
s6: introducing the flue gas with the temperature of 190 ℃ in the second heat exchange cavity 62 of the first flue gas heat exchanger 6 into the third heat exchange cavity 121 of the second flue gas heat exchanger 12 and the deacidification tower 7 through pipelines so as to further remove acid gas and metal particles in the flue gas in the deacidification tower 7;
s7: the temperature of the flue gas in the deacidification tower 7 is reduced to 60 ℃ in the dust remover 8 after the flue gas is introduced into the dust remover 8 (wet electric dust remover) through a pipeline, at the moment, the dust remover 8 removes fog drops and dust in the flue gas, the flue gas with the temperature of 60 ℃ in the dust remover 8 enters the fourth heat exchange cavity 122 of the second flue gas heat exchanger 12 through a pipeline for heat exchange, the temperature of the flue gas after heat exchange is 90 ℃, and finally the flue gas is discharged into the atmosphere through the chimney 9 under the action of the draught fan 13.
Further, the flue gas is introduced into the boiler 2, the spray tower 3, the combined type dust remover 4, the first flue gas heat exchanger 5, the reactor 6, the deacidification tower 7 and the dust remover 8 under the action of the draught fan 13, and is discharged into the atmosphere through a chimney 9 under the action of the draught fan 13.
The invention is not limited solely to that described in the specification and embodiments, and additional advantages and modifications will readily occur to those skilled in the art, so that the invention is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.

Claims (10)

1. A purification and emission device for urban garbage incineration flue gas is characterized by comprising an incinerator (1), a boiler (2), a spray tower (3), a composite dust remover (4), a first flue gas heat exchanger (5), a reactor (6), a deacidification tower (7), a dust remover (8) and a chimney (9); burn burning furnace (1), boiler (2), spray tower (3), combined type dust remover (4), first gas heater (5), deacidification tower (7), dust remover (8) and chimney (9) and pass through the pipe connection, reactor (6) connect in on first gas heater (5) and with deacidification tower (7) intercommunication, be provided with sprinkler (21) on boiler (2), be provided with atomizer (31) on spray tower (3), be provided with the duster on combined type dust remover (4).
2. The municipal refuse incineration flue gas purification and discharge apparatus according to claim 1, wherein said municipal refuse incineration flue gas purification and discharge apparatus further comprises a secondary combustion chamber (10), said secondary combustion chamber (10) being connected between said incinerator (1) and said boiler (2).
3. The municipal waste incineration flue gas purification and discharge equipment according to claim 1, wherein the combined type dust collector (4) is an electric bag combined type dust collector and comprises an electric dust collector (41) and a bag-type dust collector (42) connected to the electric dust collector (41), a carbon sprayer (43) is arranged between the electric dust collector (41) and the bag-type dust collector (42), and the carbon sprayer is arranged between the electric dust collector (41) and the bag-type dust collector (42).
4. The municipal refuse incineration flue gas purification and discharge equipment according to claim 3, wherein the bag-type dust collector (42) is further provided with a recovery hopper (421).
5. The municipal waste incineration flue gas purification and discharge equipment according to claim 1, wherein said municipal waste incineration flue gas purification and discharge equipment further comprises a heater (11), said first flue gas heat exchanger (5) comprises a first heat exchange chamber (51) and a second heat exchange chamber (52) isolated from said first heat exchange chamber (51); one end of the reactor (6) is connected to the first heat exchange cavity (51), the other end of the reactor (6) is connected with one end of the heater (11), the other end of the heater (11) is connected with one end of the second heat exchange cavity (52), and the second heat exchange cavity (52) is connected with the deacidification tower (7) through a pipeline.
6. The municipal waste incineration flue gas purification and emission equipment according to claim 5, wherein the municipal waste incineration flue gas purification and emission equipment further comprises a second flue gas heat exchanger (12), the second flue gas heat exchanger (12) comprises a third heat exchange chamber (121) and a fourth heat exchange chamber (122) isolated from the third heat exchange chamber (121), the third heat exchange chamber (121) is connected between the second heat exchange chamber (52) and the deacidification tower (7) through a pipeline, and the fourth heat exchange chamber (122) is connected between the deduster (8) and the chimney (9) through a pipeline.
7. The municipal waste incineration flue gas purification and emission equipment according to claim 6, wherein said municipal waste incineration flue gas purification and emission equipment further comprises an induced draft fan (13), said induced draft fan (13) is connected between said fourth heat exchange chamber (122) and said chimney (9).
8. The apparatus for purifying and discharging flue gas from incineration of municipal waste according to claim 1, wherein a feed hopper (111) is provided on the incinerator (1) and an economizer is provided on the boiler (2).
9. A purification treatment method of a purification emission device of urban garbage incineration flue gas is characterized by comprising the following steps,
s1: incinerating the municipal refuse in an incinerator (1), and fully combusting the incinerated municipal refuse in a secondary combustion chamber (11);
s2: introducing the flue gas of the secondary combustion chamber (11) into the boiler (2) for waste heat recovery, and spraying ammonia water in the process that the flue gas from the secondary combustion chamber (11) enters the boiler (2);
s3: introducing flue gas in a boiler (2) into a spray tower (3), and spraying lime slurry through a sprayer (31) on the spray tower (3) to react with acid gas in the flue gas to generate solid matters;
s4: firstly, introducing flue gas of a spray tower (3) into an electric dust collector (41) of a composite dust collector (4), removing dust in the flue gas through the electric dust collector (41), enabling the residual dust to enter a bag-type dust collector (42) of the composite dust collector (4), then spraying activated carbon powder to absorb dioxin in the flue gas through a carbon spraying device (43), spraying soda ash into the bag-type dust collector (42) through a powder sprayer, filtering the residual dust and the sprayed activated carbon powder through the bag-type dust collector (42), and discharging the filtered flue gas through the bag-type dust collector (42);
s5: firstly, introducing flue gas of a bag-type dust collector (42) into a first heat exchange cavity (51) of a first flue gas heat exchanger (5), heating the flue gas in the first heat exchange cavity (51), then heating the flue gas in a reactor (6) and a heater (11) by the heater (11), carrying out denitration purification on the flue gas in the reactor (6), and cooling the temperature of the flue gas discharged from the reactor (6) in a second heat exchange cavity (52) of the first flue gas heat exchanger (5);
s6: introducing the flue gas of a second heat exchange cavity (62) of the first flue gas heat exchanger (6) into a third heat exchange cavity (121) of a second flue gas heat exchanger (12) and a deacidification tower (7);
s7: the flue gas in the deacidification tower (7) is introduced into a dust remover (8) for cooling, the flue gas in the dust remover (8) enters a fourth heat exchange cavity (122) of a second flue gas heat exchanger (12) for heat exchange, and finally the flue gas is discharged into the atmosphere through a chimney (9).
10. The purification treatment method of the municipal refuse incineration flue gas purification discharge equipment according to claim 9, the method is characterized in that the temperature range of the lime slurry and the acidic gas in the flue gas after reaction to generate the solid is 160-180 ℃, the temperature of the flue gas in the bag-type dust remover is 160 ℃, the temperature of the flue gas heated in the first heat exchange cavity (51) is 190 ℃, the temperature of the flue gas heated in the reactor (6) and the heater (11) is 210 ℃, the temperature of the flue gas entering the second heat exchange cavity (52) of the first flue gas heat exchanger (5) is reduced to 190 ℃, the temperature of the flue gas after the flue gas in the deacidification tower (7) is introduced into the dust remover (8) is reduced to 60 ℃ in the dust remover (8), and the temperature of the flue gas after the flue gas in the dust remover (8) enters the fourth heat exchange cavity (122) of the second flue gas heat exchanger (12) for heat exchange is 90 ℃.
CN202010433524.5A 2020-05-21 2020-05-21 Purification and emission equipment for urban garbage incineration flue gas and purification treatment method thereof Pending CN111473352A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113685823A (en) * 2021-08-20 2021-11-23 乾健天勤环保设备(江苏)有限公司 Vertical incinerator system and process flow
BE1028933B1 (en) * 2020-12-22 2022-07-19 Indaver Nv METHOD AND DEVICE FOR CLEANING FLUE GAS ORIGINATING FROM THE COMBUSTION OF SOLID FLAMMABLE MATERIALS AND OBTAINED CLEANED FLUE GAS
EP4212232A1 (en) * 2021-12-30 2023-07-19 Indaver nv Method for extracting acid from flue gas from combustion of chlorine-comprising material and product obtained

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1028933B1 (en) * 2020-12-22 2022-07-19 Indaver Nv METHOD AND DEVICE FOR CLEANING FLUE GAS ORIGINATING FROM THE COMBUSTION OF SOLID FLAMMABLE MATERIALS AND OBTAINED CLEANED FLUE GAS
CN113685823A (en) * 2021-08-20 2021-11-23 乾健天勤环保设备(江苏)有限公司 Vertical incinerator system and process flow
EP4212232A1 (en) * 2021-12-30 2023-07-19 Indaver nv Method for extracting acid from flue gas from combustion of chlorine-comprising material and product obtained
BE1030154B1 (en) * 2021-12-30 2023-07-31 Indaver Nv Method and device for extracting acid from flue gas originating from the combustion of material containing chlorine and the product obtained

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