CN108561893B - Industrial boiler flue gas multi-pollutant cooperative control device and process flow thereof - Google Patents

Industrial boiler flue gas multi-pollutant cooperative control device and process flow thereof Download PDF

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Publication number
CN108561893B
CN108561893B CN201810396204.XA CN201810396204A CN108561893B CN 108561893 B CN108561893 B CN 108561893B CN 201810396204 A CN201810396204 A CN 201810396204A CN 108561893 B CN108561893 B CN 108561893B
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boiler
denitration
flue gas
treatment
main
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CN201810396204.XA
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Chinese (zh)
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CN108561893A (en
Inventor
魏志宏
吴谨
张显涛
杨明哲
闫旭东
王建伟
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天津兴胜蓝天洁净煤科技有限公司
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/003Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • B01D53/501Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/504Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/54Nitrogen compounds
    • B01D53/56Nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75Multi-step processes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77Liquid phase processes
    • B01D53/79Injecting reactants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8621Removing nitrogen compounds
    • B01D53/8625Nitrogen oxides
    • B01D53/8631Processes characterised by a specific device
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/90Injecting reactants
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/006Layout of treatment plant
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/025Arrangements 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/04Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/06Arrangements of devices for treating smoke or fumes of coolers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/20Reductants
    • B01D2251/206Ammonium compounds
    • B01D2251/2062Ammonia
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/20Metals or compounds thereof
    • B01D2255/207Transition metals
    • B01D2255/20723Vanadium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2255/00Catalysts
    • B01D2255/20Metals or compounds thereof
    • B01D2255/207Transition metals
    • B01D2255/20776Tungsten
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/10Nitrogen; Compounds thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/20Sulfur; Compounds thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00Intercepting solids
    • F23J2217/10Intercepting solids by filters
    • F23J2217/101Baghouse type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00Intercepting solids
    • F23J2217/50Intercepting solids by cleaning fluids (washers or scrubbers)
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2219/00Treatment devices
    • F23J2219/10Catalytic reduction devices

Abstract

The invention provides a smoke multi-pollutant cooperative control device of an industrial boiler and a process flow thereof, wherein a boiler system comprises a coal powder storage unit, a coal powder conveying unit, a boiler main body, a waste gas treatment unit and a waste water treatment unit, wherein the coal powder storage unit is connected with the boiler main body through the coal powder conveying unit, and the boiler main body is connected with the waste gas treatment unit and the waste water treatment unit; the waste gas treatment unit comprises a denitration part, a dedusting part and a desulfurization part, wherein the denitration part adopts the combined denitration of non-selective in-furnace reduction denitration and selective out-furnace reduction denitration; the dust removal part adopts pulse bag type dust removal; the desulfurization part adopts a sodium-calcium double-alkali method, and the process flow of the system comprises the following steps: the method comprises a coal powder storage process, a coal powder conveying process, a combustion process, a waste gas treatment process and a waste residue treatment process. The boiler system and the process flow thereof can effectively improve the overall performance of the boiler system, so that the concentration of the smoke dust discharged by the boiler system is lower than 10mg/m3The concentration of sulfur dioxide is less than 20mg/m3While the concentration of nitrogen oxide is 50mg/m3The following.

Description

Industrial boiler flue gas multi-pollutant cooperative control device and process flow thereof

Technical Field

The invention relates to the technical field of industrial pulverized coal boilers, in particular to a smoke multi-pollutant cooperative control device of an industrial boiler and a process flow thereof.

Background

The industrial pulverized coal boiler is a novel industrial coal-fired pulverized coal boiler which is provided by technical innovation on the basis of a large-capacity pulverized coal boiler which is originally used for a power station. During the combustion process of the industrial pulverized coal boiler, the flue gas generated by the combustion of the industrial pulverized coal boiler often contains a large amount of smoke dust, sulfur dioxide and nitrogen oxides, and if the flue gas is directly discharged into the atmosphere, serious harm is generated to the environment and human health. Along with the continuous improvement of the social living standard, higher requirements are also put forward for the pulverized coal fired boiler system, and the improvement of the industrial pulverized coal fired boiler system is also put forward to adapt to the existing development requirements, so that the industrial pulverized coal fired boiler system and the process flow thereof need to be continuously perfected and improved to reduce the content of smoke dust, sulfur dioxide and nitrogen oxides in the smoke discharged by the industrial pulverized coal fired boiler system, so as to reduce the discharge amount of the smoke dust, the sulfur dioxide and the nitrogen oxides in the industrial pulverized coal fired boiler system.

Disclosure of Invention

The invention mainly aims to solve the problems in the prior art and provide a method which can effectively improve the overall performance of a boiler system and ensure that the concentration of smoke dust discharged by the boiler system is lower than 10mg/m3The concentration of sulfur dioxide is less than 20mg/m3While the concentration of nitrogen oxide is 50mg/m3The following industrial boiler flue gas multi-pollutant cooperative control device and the process flow thereof.

In order to solve the technical problems, the invention adopts the technical scheme that: the device for cooperatively controlling the multiple pollutants in the flue gas of the industrial boiler comprises a coal powder storage unit, a coal powder conveying unit, a boiler main body, a waste gas treatment unit and a waste water treatment unit, wherein the coal powder storage unit is connected with the boiler main body through the coal powder conveying unit, and the boiler main body is connected with the waste gas treatment unit and the waste water treatment unit;

the waste gas treatment unit comprises a denitration part, a dedusting part and a desulfurization part, wherein the denitration part is connected with the boiler main body, and the output end of the denitration part is sequentially connected with the dedusting part and the desulfurization part;

the denitration part adopts a non-selective in-furnace reduction denitration and selective out-of-furnace reduction denitration combined denitration mode, and selects ammonia water as a reducing agent;

the dust removal part adopts a pulse bag type dust removal mode;

the desulfurization part adopts a sodium-calcium double-alkali method to reduce the emission of sulfur dioxide and smoke dust.

Further, the denitration part comprises an ammonia water storage tank, an ammonia water delivery pump, a dilution water tank, a static mixer, in-furnace SNCR denitration equipment and out-furnace SCR denitration equipment, the ammonia water delivery pump is arranged on a pipeline communicated with an ammonia water inlet of the static mixer at an ammonia water outlet of the ammonia water storage tank, a water outlet of the dilution water tank is communicated with a water inlet of the static mixer through a pipeline, an outlet end of the static mixer is communicated with an ammonia water injection main body water inlet end of the in-furnace SNCR denitration equipment and the out-furnace SCR denitration equipment through a pipeline, an ammonia water injection main body water outlet end of the in-furnace SNCR denitration equipment extends to a hearth of the boiler main body, and the ammonia water injection main body of the out-furnace SCR denitration equipment is arranged on a smoke exhaust pipeline of.

Furthermore, the dust removal part comprises a dust removal box, an ash discharge main body and an injection main body, the dust removal box is communicated with an outlet of a smoke exhaust pipeline subjected to denitration treatment by an injection pipe of the SCR denitration device outside the furnace, the bottom of the dust removal box is communicated with the ash discharge main body, and the injection main body is communicated with an inner cavity of the dust removal box.

Further, the desulfurization part sets up to spray layer, flue gas scrubber, defroster and aiutage including desulfurizing tower main part, gas-liquid distributor, atomizing, the tower bottom of desulfurizing tower main part is linked through the exhaust pipe export after dust removal part removes dust, and the inner chamber of this desulfurizing tower main part sprays layer, one deck flue gas scrubber and two-layer defroster by supreme gas-liquid distributor, the three-layer atomizing of setting gradually down, aiutage intercommunication defroster's exit end, and this aiutage height sets up to 95 meters.

Furthermore, an economizer is arranged on the smoke exhaust pipeline between the denitration part and the dust removal part.

Further, set up the breather valve on the aqueous ammonia storage tank, aqueous ammonia storage tank side still is provided with poison gas detector and fire sprinkler, and this aqueous ammonia storage tank encloses through the cofferdam and establishes, establish drainage pipe in the cofferdam, drainage pipe's exit end intercommunication waste water treatment unit.

Further, the waste water treatment unit includes cooling tank, acid-base waste water equalizing basin and sedimentation tank, the cooling tank all passes through the pipe connection sedimentation tank with acid-base waste water equalizing basin, the cooling tank passes through the drain mouth of pipe connection boiler main part, the acid-base waste water equalizing basin passes through the acid-base waste water mouth of row of pipe connection denitration subtotal desulfurization subtotal, the delivery port of sedimentation tank passes through the slag washing pipeline and the moisturizing pipeline that the atomizing sprayed the layer of pipeline intercommunication boiler main part.

Furthermore, the coal powder storage unit comprises a coal powder bin, a coal powder input pipeline and a coal powder conveying opening, wherein the coal powder bin is communicated with the coal powder input pipeline, and the coal powder bin is provided with the coal powder conveying opening.

Furthermore, the pulverized coal conveying unit comprises a pulverized coal conveying pipeline, a pulverized coal conveying fan, a secondary powder bin, an impeller powder feeder, a pulverized coal mixer and a Roots fan, wherein the inlet end of the pulverized coal conveying pipeline is connected with a pulverized coal conveying port, the pulverized coal conveying pipeline is provided with the pulverized coal conveying fan on a pipeline connected with a pulverized coal inlet on the secondary powder bin, the impeller powder feeder and the pulverized coal mixer are arranged in an inner cavity of the secondary powder bin, and the Roots fan is arranged on a pipeline connected with a hearth inner cavity of the boiler main body and provided with the pulverized coal conveying port on the secondary powder bin.

A process flow of an industrial boiler flue gas multi-pollutant cooperative control device comprises the following steps:

the coal powder storage process comprises the following steps: conveying the pulverized coal to a pulverized coal bin by using a pulverized coal truck with a sealed tank, and storing the pulverized coal in the sealed tank into the pulverized coal bin through a pulverized coal input pipeline to realize dust-free unloading and warehousing of the pulverized coal;

(II) coal powder conveying process: under the action of a powder conveying fan, conveying the coal powder in the coal powder bin to a secondary powder bin through a coal powder conveying pipeline;

(III) a combustion step: under the assistance of the Roots blower, pulverized coal in the secondary powder bin enters the hearth from a pipeline connected with the hearth cavity of the boiler main body, the pulverized coal is well combusted in the hearth of the boiler main body through the matching of air treated by the air preheater, and slag generated after the pulverized coal is combusted is flushed out from a slag flushing pipeline so as to realize slag discharge of the boiler main body;

(IV) an exhaust gas treatment step: the flue gas generated in the burning procedure is subjected to denitration treatment, dust removal treatment and desulfurization treatment in sequence to complete the purification process of the flue gas;

(V) wastewater treatment process: the sewage discharged from a sewage outlet of the boiler main body is cooled by a cooling tank and then enters a sedimentation tank, meanwhile, the sewage generated in the waste gas treatment process is also adjusted in pH value by an acid-base waste water adjusting tank and then is discharged into the sedimentation tank, and the waste water in the sedimentation tank is settled and then used for slag flushing of the boiler main body in the combustion process and circulating water replenishing in the waste gas treatment process;

(VI) waste residue treatment process: and collecting, transferring and carrying out centralized treatment on the waste residues discharged in the combustion process and the deposited dust generated after dust removal treatment in the waste gas treatment process.

Further, the exhaust gas treatment process comprises the following steps:

step 1: denitration treatment, wherein when pulverized coal in a hearth of a boiler main body is combusted, ammonia water in a static mixer is directly sprayed into the hearth by an injection pipe of SNCR denitration equipment in the boiler through an injection pipe of the SNCR denitration equipment in the boiler so as to carry out denitration treatment in the boiler on smoke generated by pulverized coal combustion, meanwhile, ammonia gas overflowing after excessive ammonia water sprayed by the ammonia water injection main body of the SNCR denitration equipment in the boiler is subjected to denitration reaction in the boiler enters the ammonia water injection main body of SCR denitration equipment outside the boiler along with smoke in a smoke exhaust pipeline to carry out denitration treatment outside the boiler, and the excessive ammonia gas reacts with nitrogen oxide under catalytic reduction of a catalyst, so that the concentration of the nitrogen oxide in the smoke is;

step 2: waste heat recovery treatment, in the step 1, after the denitration treatment outside the furnace is completed, the high-temperature flue gas absorbs heat in the flue gas through an economizer so as to reduce the temperature of the discharged flue gas and save energy;

and step 3: dedusting treatment, wherein the flue gas treated in the step 2 enters a dedusting part, larger particle dust in the flue gas directly falls into a dust hopper, smaller particle dust is choked on the surface of a filter bag, and the flue gas penetrating through the filter bag is discharged from a smoke discharge pipeline on a dedusting box, so that dedusting and purification of the flue gas are realized;

and 4, step 4: desulfurization treatment, the flue gas that is discharged by the exhaust pipe on the dust removal case gets into from the desulfurizing tower bottom, makes gas evenly rise through gas-liquid distributor to spray the layer at the three-layer atomizing and carry out flue gas desulfurization, and detach the salt content of smuggleing secretly in the flue gas through the flue gas scrubber, detach the moisture in the flue gas through two-layer defroster at last, discharge the flue gas by the aiutage, thereby accomplish whole exhaust-gas treatment process.

Further, in step 1 of the exhaust gas treatment process, an ammonia water transfer pump directly pumps 20% ammonia water from an ammonia water storage tank and transfers the ammonia water to a static mixer, and a dilution water tank supplies dilution water to the static mixer so as to configure the ammonia water in the static mixer into an ammonia water solution of 5-10%, thereby being used by ammonia water injection bodies of the in-furnace SNCR denitration apparatus and the out-furnace SCR denitration apparatus.

Further, in step 1 of the exhaust gas treatment process, the main components of the catalyst are titanium dioxide, vanadium pentoxide, and tungsten trioxide.

The invention has the advantages and positive effects that:

(1) the final concentration of the smoke dust discharged by a waste gas treatment unit of the boiler system can be lower than 10mg/m by adopting SNCR in the boiler and SCR outside the boiler for combined denitration in the boiler, adopting pulse bag type dust removal in the dust removal part and adopting a sodium-calcium double alkali method in the desulfurization part in the boiler system3The concentration of sulfur dioxide is less than 20mg/m3While the concentration of nitrogen oxide is 50mg/m3As a result, the exhaust gas treatment performance of the boiler system is effectively improved.

(2) Through the cooperation of ammonia water storage tank, dilution water jar and static mixer, can carry out the required aqueous ammonia solution of SNCR denitration equipment in the stove and the required aqueous ammonia solution of external SCR denitration equipment outside the stove and prepare well to supplementary SNCR denitration equipment in the stove and external SCR denitration equipment carry out twice denitration treatment to the flue gas that produces in the boiler system, with the discharge concentration of nitrogen oxide in the fully reduced flue gas, improve this boiler system's wholeness ability.

(3) Through the cooperation of pulse control appearance, pulse valve, jetting pipe and gas bag in the jetting main part, can carry out the periodic cleaning of filter bag surface dust to guarantee the dust removal case and to the good filtration of dust in the flue gas, effectively reduce the dust content in the emission flue gas.

(4) Through the setting of breather valve, toxic gas detector, fire sprinkler device and cofferdam, drainage pipe on the aqueous ammonia storage tank, can prevent that the aqueous ammonia from revealing the influence that produces to improve the safety in service performance of denitration part among the boiler system.

Drawings

FIG. 1 is a block diagram of the multi-pollutant cooperative control device for flue gas of an industrial boiler.

FIG. 2 is a block diagram of a process flow structure of the device for the cooperative control of multiple pollutants in flue gas of an industrial boiler.

Detailed Description

For a better understanding of the present invention, reference is made to the following detailed description and accompanying drawings that illustrate the invention.

As shown in fig. 1, the device for cooperatively controlling multiple pollutants in flue gas of an industrial boiler comprises a coal powder storage unit, a coal powder conveying unit, a boiler main body, a waste gas treatment unit and a wastewater treatment unit, wherein the coal powder storage unit is connected with the boiler main body through the coal powder conveying unit, and the boiler main body is connected with the waste gas treatment unit and the wastewater treatment unit; the waste gas treatment unit comprises a denitration part, a dedusting part and a desulfurization part, wherein the denitration part is connected with the boiler main body, and the output end of the denitration part is sequentially connected with the dedusting part and the desulfurization part; the denitration part adopts a non-selective in-furnace reduction denitration and selective out-of-furnace reduction denitration combined denitration mode, and ammonia water is selected as a reducing agent; the dust removal part adopts a pulse bag type dust removal mode; the desulfurization part adopts a sodium-calcium double alkali method to reduce the emission of sulfur dioxide, the denitration part in the boiler system adopts SNCR in the boiler and SCR outside the boiler for combined denitration, the dust removal part adopts pulse bag type dust removal, and the desulfurization part adopts the sodium-calcium double alkali method, so that the final emission smoke concentration of a waste gas treatment unit of the boiler system is lower than 10mg/m3The concentration of sulfur dioxide is less than 20mg/m3While the concentration of nitrogen oxide is 50mg/m3As follows, thus havingEffectively improve the waste gas treatment performance of the boiler system.

The denitration part comprises an ammonia water storage tank, an ammonia water delivery pump, a dilution water tank, a static mixer, in-furnace SNCR denitration equipment and out-furnace SCR denitration equipment, wherein the ammonia water delivery pump is arranged on a pipeline communicated with an ammonia water inlet of the static mixer at an ammonia water outlet of the ammonia water storage tank, a water outlet of the dilution water tank is communicated with a water inlet of the static mixer through a pipeline, an outlet end of the static mixer is communicated with water inlet ends of an in-furnace SNCR denitration equipment and an out-furnace SCR denitration equipment through a pipeline, an ammonia water injection main body water outlet end of the in-furnace SNCR denitration equipment extends to a hearth of a boiler main body, an ammonia water injection main body of the out-furnace SCR denitration equipment is arranged on a smoke exhaust pipeline of the boiler main body, specifically, the ammonia water injection main body of the in-furnace SNCR denitration equipment is arranged at the upper and lower sides in front of the boiler main body, each side ammonia water injection main body, through the cooperation of ammonia water storage tank, dilution water jar and static mixer, can carry out the required aqueous ammonia solution of SNCR denitration equipment in the stove and the required aqueous ammonia solution of external SCR denitration equipment outside the stove and prepare well to supplementary SNCR denitration equipment in the stove and external SCR denitration equipment carry out twice denitration treatment to the flue gas that produces in the boiler system, with the discharge concentration of nitrogen oxide in the fully reduced flue gas, improve this boiler system's wholeness ability.

The dust removal part comprises a dust removal box, an ash discharge main body and a spraying main body, wherein the dust removal box is communicated with an outlet of a smoke exhaust pipeline subjected to denitration treatment by an external SCR (selective catalytic reduction) denitration device injection pipe, the bottom of the dust removal box is communicated with the ash discharge main body, and the spraying main body is communicated with an inner cavity of the dust removal box; jetting main part includes pulse control appearance, the pulse valve, jetting pipe and gas bag, pulse control appearance, the pulse valve, jetting pipe and gas bag all are fixed in on the dust removal case, pulse control appearance electric connection pulse valve, the pulse valve sets up on the admission line that jetting pipe and gas bag are connected, the exit end of jetting pipe extends to the inner chamber in upper box district, pulse control appearance in the main part through jetting, the pulse valve, the cooperation of jetting pipe and gas bag, can carry out the periodic cleaning of filter bag surface dust, in order to guarantee the dust removal case to the good filtration of dust in the flue gas, effectively reduce the dust content in the emission flue gas.

The desulfurizing part is arranged to comprise a desulfurizing tower main body, a gas-liquid distributor, an atomization spraying layer, a flue gas washer, a demister and an exhaust funnel, the bottom of the desulfurizing tower main body is communicated with an outlet of a flue gas pipeline subjected to dust removal treatment by a dust removal part, the inner cavity of the desulfurizing tower main body is sequentially provided with the gas-liquid distributor, three atomization spraying layers, one flue gas washer and two demisters from bottom to top, the exhaust funnel is communicated with the outlet end of the demister, the height of the exhaust funnel is set to be 95 meters, in addition, the desulfurizing part also comprises a lime bin, a lime slurry supply system and an alkali liquor supply system, the lime bin is connected with the lime slurry supply system, the lime slurry supply system is communicated with a desulfurizing agent regeneration tank of the desulfurizing tower main body, the alkali liquor supply system is communicated with a desulfurizing agent regeneration tank of the desulfurizing tower main body, the desulfurizing agent regeneration tank of the desulfurizing, the good treatment of sulfur dioxide in the smoke is realized.

The smoke exhaust pipeline between the denitration part and the dust removal part is also provided with an economizer, and the economizer between the denitration part and the dust removal part can recycle waste heat in high-temperature smoke and recycle the waste heat in a combustion process of a boiler system, so that the utilization efficiency of energy is improved, and the energy is saved.

Set up the breather valve on the aqueous ammonia storage tank, aqueous ammonia storage tank side still is provided with poison gas detector and fire sprinkler, and this aqueous ammonia storage tank encloses through the cofferdam and establishes, establish drainage pipe in the cofferdam, drainage pipe's exit end intercommunication waste water treatment unit, specifically, drainage pipe's exit end intercommunication acid-base waste water equalizing basin, through breather valve on the aqueous ammonia storage tank, poison gas detector, fire sprinkler and cofferdam, drainage pipe's setting, can prevent that the influence of production is revealed to the aqueous ammonia, thereby improve the safety performance of denitration part among the boiler system.

The waste water treatment unit includes the cooling tank, acid-base waste water equalizing basin and sedimentation tank, the cooling tank all passes through the pipe connection sedimentation tank with acid-base waste water equalizing basin, the cooling tank passes through the drain mouth of pipe connection boiler main part, acid-base waste water equalizing basin passes through the acid-base waste water mouth of pipe connection denitration subtotal desulfurization subtotal row of pipe connection, the delivery port of sedimentation tank passes through the slag flushing pipeline and the moisturizing pipeline that the atomizing sprayed the layer of pipeline intercommunication boiler main part, through the cooling tank, the cooperation of acid-base waste water equalizing basin and sedimentation tank, can purify the waste water that produces in the boiler system, and reuse the water purification and wash the sediment and handle or supply desulfurization part moisturizing cyclic use, can improve the utilization ratio to waste water.

The coal powder storage unit comprises a coal powder bin, a coal powder input pipeline and a coal powder conveying opening, the coal powder bin is communicated with the coal powder input pipeline, and the coal powder bin is provided with the coal powder conveying opening.

The coal powder conveying unit comprises a coal powder conveying pipeline, a coal powder conveying fan, a secondary powder bin, an impeller powder feeder, a coal powder mixer and a Roots fan, wherein the inlet end of the coal powder conveying pipeline is connected with a coal powder conveying opening, the coal powder conveying pipeline is provided with the coal powder conveying fan on a pipeline connected with a coal powder inlet on the secondary powder bin, the inner cavity of the secondary powder bin is provided with the impeller powder feeder and the coal powder mixer, and the Roots fan is arranged on a pipeline connected with the coal powder conveying opening on the secondary powder bin and the inner cavity of the hearth of the boiler main body.

The pulverized coal bunker is made of steel and is vertically enclosed into a cylindrical shape, and pulse bunker top dust collectors are arranged in the pulverized coal bunker and the secondary pulverized coal bunker.

Three groups of low-nitrogen pulverized coal cyclone burners are arranged in a hearth of the boiler main body.

As shown in fig. 2, a process flow of the device for cooperatively controlling multiple pollutants in flue gas of an industrial boiler comprises the following steps:

the coal powder storage process comprises the following steps: conveying the pulverized coal to a pulverized coal bin by using a pulverized coal truck with a sealed tank, and storing the pulverized coal in the sealed tank into the pulverized coal bin through a pulverized coal input pipeline to realize dust-free unloading and warehousing of the pulverized coal;

(II) coal powder conveying process: under the action of a powder conveying fan, conveying the coal powder in the coal powder bin to a secondary powder bin through a coal powder conveying pipeline;

(III) a combustion step: under the assistance of the Roots blower, pulverized coal in the secondary powder bin enters the hearth from a pipeline connected with the hearth cavity of the boiler main body, the pulverized coal is well combusted in the hearth of the boiler main body through the matching of air treated by the air preheater, and slag generated after the pulverized coal is combusted is flushed out from a slag flushing pipeline so as to realize slag discharge of the boiler main body;

(IV) an exhaust gas treatment step: the flue gas generated in the burning procedure is subjected to denitration treatment, dust removal treatment and desulfurization treatment in sequence to complete the purification process of the flue gas;

(V) wastewater treatment process: the sewage discharged from a sewage outlet of the boiler main body is cooled by a cooling tank and then enters a sedimentation tank, meanwhile, the sewage generated in the waste gas treatment process is also adjusted in pH value by an acid-base waste water adjusting tank and then is discharged into the sedimentation tank, and the waste water in the sedimentation tank is settled and then used for slag flushing of the boiler main body in the combustion process and circulating water replenishing in the waste gas treatment process;

(VI) waste residue treatment process: and collecting, transferring and carrying out centralized treatment on the waste residues discharged in the combustion process and the deposited dust generated after dust removal treatment in the waste gas treatment process.

Specifically, the exhaust gas treatment process includes the steps of:

step 1: denitration treatment, wherein when pulverized coal in a hearth of a boiler main body is combusted, ammonia water in a static mixer is directly sprayed into the hearth by an injection pipe of SNCR denitration equipment in the boiler through an injection pipe of the SNCR denitration equipment in the boiler so as to carry out denitration treatment in the boiler on smoke generated by pulverized coal combustion, meanwhile, ammonia gas overflowing after excessive ammonia water sprayed by the ammonia water injection main body of the SNCR denitration equipment in the boiler is subjected to denitration reaction in the boiler enters the ammonia water injection main body of SCR denitration equipment outside the boiler along with smoke in a smoke exhaust pipeline to carry out denitration treatment outside the boiler, and the excessive ammonia gas reacts with nitrogen oxide under catalytic reduction of a catalyst, so that the concentration of the nitrogen oxide in the smoke is;

step 2: waste heat recovery treatment, in the step 1, after the denitration treatment outside the furnace is completed, the high-temperature flue gas absorbs heat in the flue gas through an economizer so as to reduce the temperature of the discharged flue gas and save energy;

and step 3: dedusting treatment, wherein the flue gas treated in the step 2 enters a dedusting part, larger particle dust in the flue gas directly falls into a dust hopper, smaller particle dust is choked on the surface of a filter bag, and the flue gas penetrating through the filter bag is discharged from a smoke discharge pipeline on a dedusting box, so that dedusting and purification of the flue gas are realized;

and 4, step 4: desulfurization treatment, the flue gas that is discharged by the exhaust pipe on the dust removal case gets into from the desulfurizing tower bottom, makes gas evenly rise through gas-liquid distributor to spray the layer at the three-layer atomizing and carry out flue gas desulfurization, and detach the salt content of smuggleing secretly in the flue gas through the flue gas scrubber, detach the moisture in the flue gas through two-layer defroster at last, discharge the flue gas by the aiutage, thereby accomplish whole exhaust-gas treatment process.

Specifically, in step 1 of the exhaust gas treatment process, an ammonia water transfer pump directly pumps 20% ammonia water from an ammonia water storage tank and transfers the ammonia water to a static mixer, and a dilution water tank supplies dilution water to the static mixer so as to configure the ammonia water in the static mixer into an ammonia water solution of 5-10%, so that the ammonia water can be used for ammonia water injection main bodies of an in-furnace SNCR denitration device and an out-of-furnace SCR denitration device.

Specifically, in step 1 of the exhaust gas treatment process, the main components of the catalyst are titanium dioxide, vanadium pentoxide, and tungsten trioxide.

Specifically, in step 3 of the waste gas treatment process, as the filtration is continuously performed, the resistance of the dust removal part is increased, when the resistance reaches a certain value, the ash removal controller of the dust removal part sends an ash removal command, the lifting valve plate is closed at first, and the filtration airflow is cut off; then, the ash removal controller sends a signal to the pulse valve, and with the opening of the pulse valve, compressed air in the air bag blows and removes ash to the filter bag through the blowing pipe, so that the filter bag rapidly swells and strongly shakes, dust attached to the surface of the filter bag rapidly breaks away from the filter bag and falls into the ash hopper, and the dust is discharged through the ash discharge valve.

When the industrial boiler flue gas multi-pollutant cooperative control device and the process flow thereof are adopted, the monitoring result data of each parameter in the flue gas generated by the boiler system through the combustion process and the flue gas discharged after the waste gas treatment process are as follows:

table one: monitoring result data (unit: emission concentration mg/m) of smoke dust and nitrogen oxides in flue gas after denitration treatment3Discharge rate kg/h)

Table two: monitoring result data (unit: emission concentration mg/m) of smoke dust and sulfur dioxide in flue gas after dust removal treatment3Discharge rate kg/h)

Table three: monitoring result data (unit: emission concentration mg/m) of smoke dust, sulfur dioxide, nitrogen oxide and ammonia in flue gas after desulfurization treatment3Discharge rate kg/h)

As can be seen from the data in the table I, the table II and the table III, after the flue gas generated in the combustion process passes through the waste gas treatment process, the content of smoke dust, sulfur dioxide and nitrogen oxides in the finally discharged flue gas is obviously reduced, and the ammonia content in the discharged flue gas is also less. And the boiler pollutant emission standard specifies that: the smoke emission concentration should not exceed 10mg/m3The emission concentration of sulfur dioxide should not exceed 20mg/m3The concentration of nitrogen oxide emission should not exceed 50mg/m3And the discharge rate of ammonia should not exceed 49.33kg/h, and the data in the third table show that the contents of smoke dust, sulfur dioxide, nitrogen oxide and ammonia discharged by the industrial boiler flue gas multi-pollutant cooperative control device and the process flow thereof are all lower than the standard value of boiler pollutant discharge, therefore, the industrial boiler flue gas multi-pollutant cooperative control device and the process flow thereof have the advantages of low emission rate, low emission cost, and low emissionIn the industrial boiler flue gas multi-pollutant cooperative control device and the process flow thereof, the waste gas treatment performance of a boiler system is higher.

In addition, when the industrial boiler flue gas multi-pollutant cooperative control device and the process flow thereof are adopted, the treatment efficiency of the boiler system waste gas treatment process on the flue gas is as follows:

table four: dust removal efficiency of boiler system dust removal processing and flue gas treatment efficiency of desulfurization processing

According to the fourth table, in the industrial boiler flue gas multi-pollutant cooperative control device and the process flow thereof, the flue gas treatment efficiency of the waste gas treatment process is higher, so that the industrial boiler flue gas multi-pollutant cooperative control device is ensured to have good waste gas treatment performance.

The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.

Claims (6)

1. The utility model provides an industrial boiler flue gas multi-pollutant cooperative control device which characterized in that: the industrial boiler flue gas multi-pollutant cooperative control device comprises a coal powder storage unit, a coal powder conveying unit, a boiler main body, a waste gas treatment unit and a wastewater treatment unit, wherein the coal powder storage unit is connected with the boiler main body through the coal powder conveying unit, and the boiler main body is connected with the waste gas treatment unit and the wastewater treatment unit;
the waste gas treatment unit comprises a denitration part, a dedusting part and a desulfurization part, wherein the denitration part is connected with the boiler main body, and the output end of the denitration part is sequentially connected with the dedusting part and the desulfurization part;
the denitration part adopts a non-selective in-furnace reduction denitration and selective out-of-furnace reduction denitration combined denitration mode, ammonia water is selected as a reducing agent, the denitration part comprises an ammonia water storage tank, an ammonia water delivery pump, a dilution water tank, a static mixer, in-furnace SNCR denitration equipment and out-furnace SCR denitration equipment, an ammonia water delivery pump is arranged on a pipeline which is communicated with an ammonia water outlet of the ammonia water storage tank and an ammonia water inlet of the static mixer, the water outlet of the dilution water tank is communicated with the water inlet of the static mixer through a pipeline, the outlet end of the static mixer is communicated with the water inlet ends of the ammonia water injection main bodies of the in-furnace SNCR denitration device and the out-furnace SCR denitration device through pipelines, the water outlet end of the ammonia water injection main body of the SNCR denitration device in the boiler extends to the hearth of the boiler main body, an ammonia water injection main body of the SCR denitration device outside the furnace is arranged on a smoke exhaust pipeline of the boiler main body;
the dust removal part adopts a pulse bag type dust removal mode, the dust removal part consists of a dust removal box, an ash discharge main body and a blowing main body, the dust removal box is communicated with an outlet of a smoke exhaust pipeline subjected to denitration treatment by an injection pipe of an SCR (selective catalytic reduction) denitration device outside the furnace, the bottom of the dust removal box is communicated with the ash discharge main body, and the blowing main body is communicated with an inner cavity of the dust removal box;
the desulfurization part adopts a sodium-calcium double-alkali method to reduce the emission of sulfur dioxide and smoke dust;
and a coal economizer is also arranged on the smoke exhaust pipeline between the denitration part and the dust removal part.
2. The industrial boiler flue gas multi-pollutant cooperative control device according to claim 1, is characterized in that: the desulfurization part sets up to spray layer, flue gas scrubber, defroster and aiutage including desulfurizing tower main part, gas-liquid distributor, atomizing, the tower bottom of desulfurizing tower main part is linked through the exhaust pipe export after dust removal part removes dust, and the inner chamber of this desulfurizing tower main part sprays layer, one deck flue gas scrubber and two-layer defroster by supreme gas-liquid distributor, the three-layer atomizing of setting gradually down, aiutage intercommunication defroster's exit end, and this aiutage height sets up to 95 meters.
3. The industrial boiler flue gas multi-pollutant cooperative control device according to claim 1, is characterized in that: set up the breather valve on the aqueous ammonia storage tank, aqueous ammonia storage tank side still is provided with poison gas detector and fire sprinkler, and this aqueous ammonia storage tank encloses through the cofferdam and establishes, establish drainage pipe in the cofferdam, drainage pipe's exit end intercommunication waste water treatment unit.
4. The industrial boiler flue gas multi-pollutant cooperative control device according to claim 2, is characterized in that: the waste water treatment unit includes cooling tank, acid-base waste water equalizing basin and sedimentation tank, the cooling tank all passes through the pipe connection sedimentation tank with the acid-base waste water equalizing basin, the cooling tank passes through the drain mouth of pipe connection boiler main part, the acid-base waste water equalizing basin passes through the acid-base waste water mouth of row of pipe connection denitration subtotal desulfurization subtotal, the delivery port of sedimentation tank passes through the pipeline and communicates the towards sediment pipeline of boiler main part and the moisturizing pipeline that the layer was sprayed in the atomizing.
5. The technological process of the industrial boiler flue gas multi-pollutant cooperative control device is characterized in that: the method comprises the following steps:
the coal powder storage process comprises the following steps: conveying the pulverized coal to a pulverized coal bin by using a pulverized coal truck with a sealed tank, and storing the pulverized coal in the sealed tank into the pulverized coal bin through a pulverized coal input pipeline to realize dust-free unloading and warehousing of the pulverized coal;
(II) coal powder conveying process: under the action of a powder conveying fan, conveying the coal powder in the coal powder bin to a secondary powder bin through a coal powder conveying pipeline;
(III) a combustion step: under the assistance of the Roots blower, pulverized coal in the secondary powder bin enters the hearth from a pipeline connected with the hearth cavity of the boiler main body, the pulverized coal is well combusted in the hearth of the boiler main body through the matching of air treated by the air preheater, and slag generated after the pulverized coal is combusted is flushed out from a slag flushing pipeline so as to realize slag discharge of the boiler main body;
(IV) an exhaust gas treatment step: the flue gas generated in the combustion process is subjected to denitration treatment, dust removal treatment and desulfurization treatment in sequence to complete the purification process of the flue gas, and the waste gas treatment process comprises the following steps:
step 1: denitration treatment, wherein when pulverized coal in a hearth of a boiler main body is combusted, ammonia water in a static mixer is directly sprayed into the hearth by an injection pipe of SNCR denitration equipment in the boiler through an injection pipe of the SNCR denitration equipment in the boiler so as to carry out denitration treatment in the boiler on smoke generated by pulverized coal combustion, meanwhile, ammonia gas overflowing after excessive ammonia water sprayed by the ammonia water injection main body of the SNCR denitration equipment in the boiler is subjected to denitration reaction in the boiler enters the ammonia water injection main body of SCR denitration equipment outside the boiler along with smoke in a smoke exhaust pipeline to carry out denitration treatment outside the boiler, and the excessive ammonia gas reacts with nitrogen oxide under catalytic reduction of a catalyst, so that the concentration of the nitrogen oxide in the smoke is;
step 2: waste heat recovery treatment, in the step 1, after the denitration treatment outside the furnace is completed, the high-temperature flue gas absorbs heat in the flue gas through an economizer so as to reduce the temperature of the discharged flue gas and save energy;
and step 3: dedusting treatment, wherein the flue gas treated in the step 2 enters a dedusting part, larger particle dust in the flue gas directly falls into a dust hopper, smaller particle dust is choked on the surface of a filter bag, and the flue gas penetrating through the filter bag is discharged from a smoke discharge pipeline on a dedusting box, so that dedusting and purification of the flue gas are realized;
and 4, step 4: the method comprises the following steps of (1) desulfurization treatment, wherein flue gas discharged from a smoke discharge pipeline on a dust removal box enters from the bottom of a desulfurization tower, the gas uniformly rises through a gas-liquid distributor, flue gas desulfurization is carried out on three atomization spraying layers, salt carried in the flue gas is removed through a flue gas washer, and finally the flue gas is discharged from an exhaust funnel after moisture in the flue gas is removed through two layers of demisters, so that the whole waste gas treatment process is completed;
(V) wastewater treatment process: the sewage discharged from a sewage outlet of the boiler main body is cooled by a cooling tank and then enters a sedimentation tank, meanwhile, the sewage generated in the waste gas treatment process is also adjusted in pH value by an acid-base waste water adjusting tank and then is discharged into the sedimentation tank, and the waste water in the sedimentation tank is settled and then used for slag flushing of the boiler main body in the combustion process and circulating water replenishing in the waste gas treatment process;
(VI) waste residue treatment process: and collecting, transferring and carrying out centralized treatment on the waste residues discharged in the combustion process and the deposited dust generated after dust removal treatment in the waste gas treatment process.
6. The process flow of the industrial boiler flue gas multi-pollutant cooperative control device according to claim 5, is characterized in that: in the step 1 of the waste gas treatment process, an ammonia water delivery pump directly pumps 20% ammonia water from an ammonia water storage tank and delivers the ammonia water to a static mixer, and a dilution water tank provides dilution water for the static mixer so as to configure the ammonia water in the static mixer into an ammonia water solution with the concentration of 5-10%, so that the ammonia water can be used for ammonia water injection main bodies of an SNCR denitration device in a furnace and an SCR denitration device outside the furnace.
CN201810396204.XA 2018-04-27 2018-04-27 Industrial boiler flue gas multi-pollutant cooperative control device and process flow thereof CN108561893B (en)

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CN101422691B (en) * 2008-11-20 2011-12-07 武汉凯迪电力环保有限公司 Multi-pollutant removing technique and device of fuel coal smoke
CN103521022B (en) * 2013-10-12 2015-05-13 华北电力大学(保定) Smoke multi-pollutant removing apparatus
CN103691291A (en) * 2013-12-25 2014-04-02 华纺股份有限公司 Process for carrying out denitration on incineration flue gas generated by printing and dyeing sludge
CN104100964A (en) * 2014-07-16 2014-10-15 西安西热锅炉环保工程有限公司 Synergistic removal system and method for realizing ultra-low emission of multiple pollutants of smoke of thermal power plant
CN106352363B (en) * 2016-08-31 2019-07-23 吕宜德 A kind of Industrial Boiler low nitrogen oxide burning and environment friendly system and process
CN206428107U (en) * 2017-01-23 2017-08-22 李才林 A kind of desulphurization denitration sewage-treatment plant

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