WO2023050897A1 - Système de désulfuration et de dénitrification à basse température de gaz de combustion pour un four de combustion à four rotatif d'une usine d'incinération des déchets - Google Patents

Système de désulfuration et de dénitrification à basse température de gaz de combustion pour un four de combustion à four rotatif d'une usine d'incinération des déchets Download PDF

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WO2023050897A1
WO2023050897A1 PCT/CN2022/099162 CN2022099162W WO2023050897A1 WO 2023050897 A1 WO2023050897 A1 WO 2023050897A1 CN 2022099162 W CN2022099162 W CN 2022099162W WO 2023050897 A1 WO2023050897 A1 WO 2023050897A1
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Prior art keywords
flue gas
temperature
inlet
desulfurization
gas inlet
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PCT/CN2022/099162
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English (en)
Chinese (zh)
Inventor
李卫东
汪世清
梁鹤涛
许世森
郜时旺
肖平
刘练波
牛红伟
虢德军
Original Assignee
中国华能集团清洁能源技术研究院有限公司
华能湖南岳阳发电有限责任公司
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Publication of WO2023050897A1 publication Critical patent/WO2023050897A1/fr

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    • 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
    • B01D53/02Separation 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 by adsorption, e.g. preparative gas chromatography
    • B01D53/04Separation 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 by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • 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
    • 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/20Incineration of waste; Incinerator constructions; Details, accessories or control therefor having rotating or oscillating drums
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23GCREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44Details; Accessories
    • F23G5/46Recuperation of heat
    • 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
    • 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Definitions

  • This application relates to the technical field of gas purification, in particular to a low-temperature desulfurization and denitrification system for flue gas from a rotary kiln combustion furnace in a waste power plant.
  • the composition of the flue gas produced during the combustion process is also extremely complex.
  • the flue gas of the garbage power plant contains nitrogen oxides and sulfur dioxide, and the flue gas must be desulfurized and denitrified before being discharged.
  • the flue gas is directly denitrated at high temperature, and then desulfurized, and the denitrification efficiency is low.
  • the denitrification reflection device is installed in the waste heat boiler.
  • the raw material for denitrification is urea, and the urea is prepared into a certain concentration of urea solution, and then the urea solution is sprayed into the waste heat boiler furnace with a pump.
  • the temperature in the furnace is around 1000°C.
  • the high-temperature flue gas is fully mixed for a certain period of time in the furnace body of the misty urea solution.
  • NOx reacts with misty urea solution; when the amount of NOx is half of the content of urea, the removal rate of nitrogen oxides is about 30%-50%, so the desulfurization rate is low .
  • This application aims to solve one of the technical problems in the related art at least to a certain extent.
  • the embodiment of the present application proposes a low-temperature desulfurization and denitrification system for flue gas from a rotary kiln combustion furnace of a waste power plant.
  • a rotary kiln combustion furnace the rotary kiln combustion furnace includes a flue gas discharge port;
  • a waste heat boiler the waste heat boiler includes a first flue gas inlet and a first flue gas outlet, and the flue gas discharge port communicates with the first flue gas inlet so as to pass flue gas into the waste heat boiler so that The flue gas heats the waste heat boiler, thereby reducing the temperature of the flue gas;
  • An absorption refrigerating unit includes a steam generator and an evaporator
  • the steam generator includes a second flue gas inlet and a second flue gas outlet
  • the evaporator includes a third flue gas inlet and a third a flue gas outlet
  • the first flue gas outlet communicates with the second flue gas inlet, so as to pass the flue gas into the steam generator, thereby reducing the temperature of the flue gas;
  • a desulfurization tower the desulfurization tower is provided with slaked lime for desulfurization, the desulfurization tower includes a fourth flue gas inlet and a fourth flue gas outlet, and the second flue gas outlet communicates with the fourth flue gas inlet, so that passing the flue gas into the desulfurization tower to desulfurize the flue gas,
  • the fourth flue gas outlet communicates with the third flue gas inlet, so as to pass the flue gas into the evaporator, thereby reducing the temperature of the flue gas;
  • a low-temperature adsorption tower the low-temperature adsorption tower includes a fifth flue gas inlet and a fifth flue gas outlet, and the third flue gas outlet communicates with the fifth flue gas inlet so that the flue gas can be passed into the low-temperature In the adsorption tower, the flue gas is desulfurized and denitrified.
  • the waste heat power plant rotary kiln combustion furnace flue gas low-temperature desulfurization and denitrification system of the embodiment of the present application cools the flue gas through the waste heat boiler and the absorption refrigeration unit to reduce the temperature of the flue gas. After cooling, the flue gas is desulfurized in the desulfurization tower. The desulfurization efficiency of the final flue gas is high, so the desulfurization rate of the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application is increased.
  • the flue gas after the desulfurization treatment of the desulfurization tower is cooled again by the absorption refrigeration unit, and the flue gas after cooling is subjected to desulfurization and denitrification treatment in the low-temperature adsorption tower.
  • the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application further includes a cooling tower, the cooling tower includes a sixth flue gas inlet and a sixth flue gas outlet, and the sixth flue gas
  • the gas inlet is connected with the second flue gas inlet so that the flue gas can be passed into the cooling tower to reduce the temperature of the flue gas
  • the sixth flue gas outlet is connected with the fourth flue gas inlet communicated, so that the second flue gas outlet communicates with the fourth flue gas inlet.
  • the dust collector includes an air inlet and an air outlet, the air inlet communicates with the fourth flue gas outlet so as to pass the flue gas into the dust collector, and the air outlet It communicates with the third flue gas inlet, so that the fourth flue gas outlet communicates with the third flue gas inlet.
  • the waste gas power plant rotary kiln combustion furnace flue gas low-temperature desulfurization and denitrification system of the embodiment of the present application further includes a precooler, the precooler includes a seventh flue gas inlet and a seventh flue gas outlet, and the first The seventh flue gas inlet communicates with the gas outlet so that the flue gas can be passed into the precooler to reduce the temperature of the flue gas; the seventh flue gas outlet is connected to the third flue gas inlet communicated so that the gas outlet communicates with the third flue gas inlet.
  • the precooler includes a first heat exchange assembly and a second heat exchange assembly
  • the first heat exchange assembly includes the seventh flue gas inlet and the seventh flue gas outlet
  • the The second heat exchange component can be fed with low-temperature fluid
  • the seventh flue gas inlet communicates with the gas outlet, so that the flue gas can be passed into the first heat exchange component, thereby reducing the temperature of the flue gas .
  • the second heat exchange component has an eighth flue gas inlet and an eighth flue gas outlet, and the eighth flue gas inlet communicates with the fifth flue gas outlet so that the flue gas can pass through
  • the second heat exchange component is used to make the flue gas form the low-temperature fluid.
  • the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant further includes an induced draft fan, which is arranged between the precooler and the dust collector, and the induced draft fan is arranged between the precooler and the dust collector.
  • the air inlet of the fan communicates with the air outlet, and the air outlet of the induced fan communicates with the seventh flue gas inlet, so that the seventh flue gas inlet communicates with the air outlet.
  • the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant in the embodiment of the present application further includes a chimney, and the chimney communicates with the fifth flue gas outlet or the eighth flue gas outlet for discharging the smoke.
  • the waste heat boiler includes a flue gas pipeline
  • the flue gas pipeline includes the first flue gas inlet and the first flue gas outlet
  • the flue gas pipeline is used to heat the waste heat boiler.
  • Fig. 1 is a schematic structural diagram of a low-temperature desulfurization and denitrification system for flue gas from a rotary kiln combustion furnace in a waste-to-energy power plant according to an embodiment of the present application.
  • Fig. 2 is a schematic structural diagram of a low-temperature desulfurization and denitrification system for flue gas from a rotary kiln combustion furnace in a waste-to-energy power plant according to an embodiment of the present application.
  • Waste heat boiler 2 first flue gas inlet 21; first flue gas outlet 22;
  • Absorption refrigeration unit 3 steam generator 31; second flue gas inlet 311; second flue gas outlet 312; evaporator 32; third flue gas inlet 321; third flue gas outlet 322;
  • Desulfurization tower 4 fourth flue gas inlet 41; fourth flue gas outlet 42;
  • Dust collector 7 air inlet 71; air outlet 72; dust outlet 73;
  • Precooler 9 first heat exchange component 91; seventh flue gas inlet 911; seventh flue gas outlet 912; second heat exchange component 92; eighth flue gas inlet 921; eighth flue gas outlet 922;
  • the low-temperature desulfurization and denitrification system of the rotary kiln combustion furnace flue gas of the waste power plant includes a rotary kiln combustion furnace 1, a waste heat boiler 2, an absorption refrigeration unit 3, a desulfurization tower 4 and a low-temperature adsorption tower 5.
  • the rotary kiln combustion furnace 1 includes a flue gas discharge port 11. Specifically, the rotary kiln combustion furnace 1 has a flue gas discharge port 11, so that the high-temperature flue gas generated in the rotary kiln combustion furnace 1 (the temperature of the high-temperature flue gas is between 1100 ° C and 1200°C) is discharged from the flue gas discharge port 11 of the rotary kiln combustion furnace 1.
  • the waste heat boiler 2 includes a first flue gas inlet 21 and a first flue gas outlet 22, and the flue gas discharge port 11 communicates with the first flue gas inlet 21 so as to pass the flue gas into the waste heat boiler 2 so that the flue gas heats the waste heat boiler 2, thereby reducing the temperature of the flue gas.
  • the high-temperature flue gas discharged from the flue gas discharge port 11 of the rotary kiln combustion furnace 1 enters the waste heat boiler 2 through the first flue gas inlet 21 .
  • the heat exchange between the high-temperature flue gas and the waste heat boiler 2, and the heat exchange between the high-temperature flue gas and the water in the waste heat boiler 2 can reduce the temperature of the high-temperature flue gas, wherein the temperature of the high-temperature flue gas after reducing the temperature is 300°C -350°C, the cooled high-temperature flue gas is discharged from the first flue gas outlet 22 of the waste heat boiler 2 .
  • the waste heat boiler 2 can absorb the heat of the high-temperature flue gas, thereby improving the utilization rate of the heat released by fuel combustion.
  • the absorption refrigeration unit 3 includes a steam generator 31 and an evaporator 32, the steam generator 31 includes a second flue gas inlet 311 and a second flue gas outlet 312, and the evaporator 32 includes a third flue gas inlet 321 and a third flue gas outlet 322, the first flue gas outlet 22 communicates with the second flue gas inlet 311, so as to pass the flue gas into the steam generator 31, thereby reducing the temperature of the flue gas.
  • the flue gas discharged from the waste heat boiler 2 enters the steam generator 31 through the second flue gas inlet 311 of the steam generator 31, and the flue gas exchanges heat with the coolant in the steam generator 31, thereby evaporating the coolant. And absorb the heat of the flue gas, and further, the cooled flue gas is discharged from the second flue gas outlet 312 of the steam generator 31 .
  • the desulfurization tower 4 includes a fourth flue gas inlet 41 and a fourth flue gas outlet 42, the second flue gas outlet 312 communicates with the fourth flue gas inlet 41, so that the flue gas is passed into the desulfurization tower 4, thereby desulfurizing the flue gas .
  • the flue gas discharged from the steam generator 31 enters the desulfurization tower 4 through the fourth flue gas inlet 41, and the flue gas is desulfurized in the desulfurization tower 4 to remove sulfur-containing compounds in the flue gas. After treatment, it is discharged from the fourth flue gas outlet 42 of the desulfurization tower 4 .
  • the fourth flue gas outlet 42 communicates with the third flue gas inlet 321 so as to pass the flue gas into the evaporator 32 to reduce the temperature of the flue gas.
  • the desulfurized flue gas is discharged through the fourth flue gas outlet 42 of the desulfurization tower 4, and enters the evaporator 32 from the third flue gas inlet 321 of the evaporator 32, so that the flue gas is separated from the refrigerant in the evaporator 32. heat exchange, thereby reducing the temperature of the flue gas.
  • Slaked lime is arranged in the desulfurization tower.
  • the desulfurization tower 4 desulfurizes the flue gas by reacting slaked lime with the flue gas, so the desulfurization tower can remove sulfur-containing compounds in the flue gas.
  • the desulfurization treatment of the flue gas by the desulfurization tower 4 includes dry desulfurization and semi-dry desulfurization.
  • dry desulfurization is used to remove sulfur-containing compounds in flue dust, wherein dry slaked lime is used as an absorbent, and the flue gas in the desulfurization tower 4 is reacted with dry slaked lime, thereby removing sulfur-containing compounds in the flue gas.
  • semi-dry desulfurization is used to remove sulfur compounds in the flue dust.
  • the slaked lime slurry is sprayed in the desulfurization tower 4, so that the slaked lime slurry is evenly distributed in the desulfurization tower 4, and the flue gas reacts with the slaked lime in the desulfurization tower 4, thereby removing sulfur compounds in the flue gas.
  • the low-temperature adsorption tower 5 includes the fifth flue gas inlet 51 and the fifth flue gas outlet 52, and the third flue gas outlet 322 communicates with the fifth flue gas inlet 51, so that the flue gas is passed into the low-temperature adsorption tower 5, thereby the flue gas For desulfurization and denitrification.
  • the desulfurized flue gas that has been cooled is discharged through the third flue gas outlet 322 of the evaporator 32, and enters the low-temperature adsorption tower 5 from the fifth flue gas inlet 51 of the low-temperature adsorption tower 5 for desulfurization and denitration treatment.
  • the desulfurized and denitrified flue gas is discharged to the outside through the fifth flue gas outlet 52 .
  • the waste heat power plant rotary kiln combustion furnace flue gas low-temperature desulfurization and denitrification system of the embodiment of the present application cools the flue gas through the waste heat boiler 2 and the absorption refrigeration unit 3 to reduce the temperature of the flue gas. After cooling, the flue gas is desulfurized in the desulfurization tower 4 , the desulfurization efficiency of the flue gas after cooling is high, so the desulfurization rate of the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application is increased.
  • the flue gas desulfurized by the desulfurization tower 4 is cooled again by the absorption refrigeration unit 3, and the flue gas after cooling is subjected to desulfurization and denitrification treatment in the low-temperature adsorption tower 5, and the desulfurization and desulfurization efficiency of the flue gas after cooling again is high, so
  • the denitrification rate of the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application is increased.
  • the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant has the advantages of high desulfurization rate and high denitrification rate.
  • the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application further includes a cooling tower 6, and the cooling tower 6 includes a sixth flue gas inlet 61 and a sixth flue gas inlet 61.
  • the outlet 62, the sixth flue gas inlet 61 communicates with the second flue gas inlet 311, so as to pass the flue gas into the cooling tower 6, thereby reducing the temperature of the flue gas, and the sixth flue gas outlet 62 communicates with the fourth flue gas inlet 41 , so that the second flue gas outlet 312 communicates with the fourth flue gas inlet 41 .
  • the flue gas cooled by the steam generator 31 is discharged from the second flue gas inlet 311 , enters the cooling tower 6 through the sixth flue gas inlet 61 , and the flue gas is cooled in the cooling tower 6 .
  • the flue gas is discharged through the sixth flue gas outlet 62 and enters the desulfurization tower 4 through the fourth flue gas inlet 41 .
  • the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant in the embodiment of the present application has the advantage of environmental protection.
  • the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application further includes a dust collector 7, and the dust collector 7 includes an air inlet 71 and an air outlet 72, and the air inlet
  • the port 71 communicates with the fourth flue gas outlet 42 so as to pass the flue gas into the dust collector 7
  • the gas outlet 72 communicates with the third flue gas inlet 321 so that the fourth flue gas outlet 42 communicates with the third flue gas inlet 321 .
  • the flue gas desulfurized by the desulfurization tower 4 is discharged from the fourth flue gas outlet 42, enters the dust collector 7 through the air inlet 71 of the dust collector 7, and the flue gas is subjected to dust removal treatment in the dust collector 7, and then removed
  • the soot in the flue gas makes the flue gas discharged to the outside without soot, and then achieves the purpose of environmental protection.
  • the dust collector 7 has a dust outlet 73, through which the smoke and dust filtered by the dust collector 7 are discharged, and then the filtered smoke and dust are recycled to avoid secondary pollution to the environment.
  • the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant in the embodiment of the present application has the advantage of environmental protection.
  • the low-temperature desulfurization and denitrification system for flue gas from the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application further includes a precooler 9, and the precooler 9 includes a seventh flue gas inlet 911 and a seventh flue gas inlet 911.
  • the flue gas outlet 912 and the seventh flue gas inlet 911 communicate with the gas outlet 72 so as to pass the flue gas into the precooler 9 to reduce the temperature of the flue gas.
  • the seventh flue gas outlet 912 communicates with the third flue gas inlet 321 , so that the gas outlet 72 communicates with the third flue gas inlet 321 .
  • the flue gas dedusted by the dust collector 7 is discharged from the gas outlet 72 of the dust collector 7, enters the precooler 9 through the seventh flue gas inlet 911 of the precooler 9, and the flue gas is cooled in the precooler 9.
  • the cooled flue gas is discharged through the seventh flue gas outlet 912 and enters the evaporator 32 through the third flue gas inlet 321 .
  • the precooler 9 includes a first heat exchange assembly 91 and a second heat exchange assembly 92
  • the first heat exchange assembly 91 includes a seventh flue gas inlet 911 and a seventh flue gas outlet 912
  • the second heat exchange assembly 92 can The low-temperature fluid is passed through, and the seventh flue gas inlet 911 communicates with the gas outlet 72, so as to pass the flue gas into the first heat exchange component 91, thereby reducing the temperature of the flue gas.
  • the flue gas dedusted by the dust collector 7 enters the first heat exchange assembly 91 through the seventh flue gas inlet 911, and the flue gas in the first heat exchange assembly 91 and the low-temperature fluid in the second heat exchange assembly 92 Heat exchange is performed, thereby reducing the temperature of the flue gas in the first heat exchange assembly 91 .
  • the cooled flue gas is discharged through the seventh flue gas outlet 912 of the first heat exchange component 91 , and enters the evaporator 32 through the third flue gas inlet 321 to be cooled again.
  • the second heat exchanging assembly 92 has an eighth flue gas inlet 921 and an eighth flue gas outlet 922, and the eighth flue gas inlet 921 communicates with the fifth flue gas outlet 52, so that the flue gas passes into the second heat exchanging assembly 92 , so that the flue gas forms a low-temperature fluid.
  • the flue gas desulfurized and denitrified by the low-temperature adsorption tower 5 is discharged through the fifth flue gas outlet 52 , and enters the second heat exchange assembly 92 through the eighth flue gas inlet 921 of the second heat exchange assembly 92 . It can be understood that the flue gas in the cryogenic adsorption tower 5 is cooled again through the evaporator 32, and then the temperature of the flue gas discharged from the cryogenic adsorption tower 5 is lower than that of the flue gas in the first heat exchange assembly 91.
  • the exhausted flue gas forms a low-temperature fluid, and the low-temperature fluid formed by the flue gas exchanges heat with the flue gas of the first heat exchange component 91 in the second heat exchange component 92, thereby reducing the temperature of the flue gas in the first heat exchange component 91. temperature. Therefore, the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the garbage power plant in the embodiment of the present application has the advantage of saving energy.
  • the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant in the embodiment of the present application further includes an induced draft fan 8, and the induced draft fan 8 is arranged between the precooler 9 and the dust collector 7 , the air inlet of the induced draft fan 8 communicates with the air outlet 72 , and the air outlet of the induced draft fan 8 communicates with the seventh flue gas inlet 911 , so that the seventh flue gas inlet 911 communicates with the air outlet 72 .
  • the induced draft fan 8 has a ninth flue gas inlet 81 and a ninth flue gas outlet 82 , wherein the ninth flue gas inlet 81 is the air inlet of the induced draft fan 8 , and the ninth flue gas outlet 82 is the air outlet of the induced draft fan 8 .
  • the ninth flue gas inlet 81 of the induced draft fan 8 communicates with the gas outlet 72 of the dust collector 7
  • the ninth flue gas outlet 82 of the induced draft fan 8 communicates with the seventh flue gas inlet 911 of the precooler 9 .
  • the induced draft fan 8 can increase the flow velocity of the flue gas, thereby increasing the flue gas treatment efficiency in the low-temperature desulfurization and denitrification system for the flue gas of the rotary kiln combustion furnace of the waste power plant according to the embodiment of the present application.
  • the low-temperature desulfurization and denitrification system for flue gas from the rotary kiln combustion furnace of the garbage power plant in the embodiment of the present application further includes a chimney, the chimney and the fifth flue gas outlet 52 or the eighth flue gas outlet 922 for discharging flue gas.
  • the chimney communicates with the fifth flue gas outlet 52 of the low-temperature adsorption tower 5, so that the flue gas discharged from the low-temperature adsorption tower 5 is discharged through the chimney.
  • the chimney communicates with the eighth flue gas outlet 922 of the precooler 9, so that the flue gas discharged from the precooler 9 is discharged through the chimney.
  • the waste heat boiler 2 includes a flue gas pipeline
  • the flue gas pipeline includes a first flue gas inlet 21 and a first flue gas outlet 22
  • the flue gas pipeline is used for heating the waste heat boiler 2 .
  • the high-temperature flue gas discharged from the rotary kiln combustion furnace 1 enters the flue gas pipe from the first flue gas inlet 21 of the flue gas pipe, and the high-temperature flue gas exchanges heat with the waste heat boiler 2 in the flue gas pipe, thereby reducing the temperature of the high-temperature flue gas. air temperature.
  • first and second are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features.
  • the features defined as “first” and “second” may explicitly or implicitly include at least one of these features.
  • “plurality” means at least two, such as two, three, etc., unless otherwise specifically defined.
  • a first feature being "on” or “under” a second feature may mean that the first and second features are in direct contact, or that the first and second features are indirect through an intermediary. touch.
  • “above”, “above” and “above” the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
  • “Below”, “beneath” and “beneath” the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.
  • the terms “one embodiment,” “some embodiments,” “example,” “specific examples,” or “some examples” mean specific features, structures, materials, or features described in connection with the embodiment or examples. Features are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

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Abstract

L'invention porte sur un système de désulfuration et de dénitrification à basse température de gaz de combustion pour un four de combustion à four rotatif d'une usine d'incinération de déchets. Le système comprend un four de combustion à four rotatif (1), une chaudière de récupération de chaleur (2), une unité de réfrigération par absorption (3), une tour de désulfuration (4), et une tour d'adsorption à basse température (5), l'unité de réfrigération à absorption (3) comprenant un générateur de vapeur (31) et un évaporateur (32) ; un orifice de décharge de gaz de combustion (11) du four de combustion à four rotatif (1) étant en communication avec une première entrée de gaz de combustion (21) de la chaudière à récupération de chaleur (2) ; une première sortie de gaz de combustion (22) de la chaudière à récupération de chaleur (2) étant en communication avec une seconde entrée de gaz de combustion (311) du générateur de vapeur (31) ; une seconde sortie de gaz de combustion (312) du générateur de vapeur (31) étant en communication avec une quatrième entrée de gaz de combustion (41) de la tour de désulfuration (4) ; une quatrième sortie de gaz de combustion (42) de la tour de désulfuration (4) étant en communication avec une troisième entrée de gaz de combustion (321) de l'évaporateur (32) ; une troisième sortie de gaz de combustion (322) de l'évaporateur (32) étant en communication avec une cinquième entrée de gaz de combustion (51) de la tour d'adsorption à basse température (5) ; et le gaz de combustion traité étant déchargé vers l'extérieur à partir d'une cinquième sortie de gaz de combustion (52) de la tour d'adsorption à basse température (5). Le système de désulfuration et de dénitrification à basse température de gaz de combustion pour un four de combustion à four rotatif d'une usine d'incinération présente les avantages d'un taux de désulfuration élevé et d'un taux de dénitration élevé.
PCT/CN2022/099162 2021-09-28 2022-06-16 Système de désulfuration et de dénitrification à basse température de gaz de combustion pour un four de combustion à four rotatif d'une usine d'incinération des déchets WO2023050897A1 (fr)

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CN216557146U (zh) * 2021-09-28 2022-05-17 中国华能集团清洁能源技术研究院有限公司 垃圾电厂回转窑燃烧炉烟气低温脱硫脱硝系统
CN113769569A (zh) * 2021-09-28 2021-12-10 中国华能集团清洁能源技术研究院有限公司 垃圾电厂回转窑燃烧炉烟气低温脱硫脱硝方法和系统

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