WO2023050894A1 - Low-temperature desulfurization and denitrification system for coking plant flue gas - Google Patents

Low-temperature desulfurization and denitrification system for coking plant flue gas Download PDF

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WO2023050894A1
WO2023050894A1 PCT/CN2022/099159 CN2022099159W WO2023050894A1 WO 2023050894 A1 WO2023050894 A1 WO 2023050894A1 CN 2022099159 W CN2022099159 W CN 2022099159W WO 2023050894 A1 WO2023050894 A1 WO 2023050894A1
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Prior art keywords
flue gas
inlet
outlet
desulfurization
low
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PCT/CN2022/099159
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French (fr)
Chinese (zh)
Inventor
肖平
汪世清
李卫东
许世森
郜时旺
刘练波
牛红伟
雷中辉
易湘明
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 WO2023050894A1 publication Critical patent/WO2023050894A1/en

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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
    • 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
    • B01D53/80Semi-solid phase processes, i.e. by using slurries
    • 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
    • B01D53/81Solid phase processes
    • B01D53/82Solid phase processes with stationary 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00Methods of steam generation characterised by form of heating method
    • F22B1/02Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22DPREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00Feed-water supply not provided for in other main groups
    • F22D11/02Arrangements of feed-water pumps
    • F22D11/06Arrangements of feed-water pumps for returning condensate to boiler

Definitions

  • the present application relates to the technical field of gas purification, in particular to a low-temperature desulfurization and denitrification system for coking plant flue gas.
  • the hot flue gas discharged from the chimney contains sulfur dioxide, nitrogen oxides, and dust, and the content of nitrogen oxides is high.
  • the treatment of the flue gas discharged from the coking plant needs to heat up the flue gas, and the denitrification method of the related art has a low denitrification efficiency.
  • the difficulty of coke oven flue gas treatment is denitrification. Because SO 2 in the flue gas will react with NH 3 , the coke oven flue gas will crystallize if the temperature is too low, which will block the micropores on the surface of the denitrification catalyst and cause denitrification catalyst poisoning.
  • the applicable temperature range of the relevant technology is 320°C-420°C, while the temperature from the coke oven discharge to the flue gas treatment equipment is 180°C-300°C.
  • the use of the relevant technology to treat the coke oven flue gas requires the coke oven flue gas to be heated. Moreover, the denitration efficiency of the denitration method in the related art is low.
  • This application aims to solve one of the technical problems in the related art at least to a certain extent. For this reason, the embodiment of this application proposes one.
  • a waste heat boiler the waste heat boiler includes a first flue gas inlet, a first flue gas outlet, a first water outlet and a first water inlet, and the flue gas can enter the waste heat boiler through the first flue gas inlet;
  • a desulfurization tower includes a second flue gas inlet and a second flue gas outlet, the first flue gas outlet communicates with the second flue gas inlet, so that the flue gas is passed into the desulfurization tower , so as to desulfurize the flue gas;
  • An absorption refrigeration unit includes a steam generator and an evaporator
  • the steam generator includes a second water inlet and a second water outlet
  • the evaporator includes a third flue gas inlet and a third flue gas outlet
  • the first water outlet communicates with the second water inlet so as to pass the hot water in the waste heat boiler into the steam generator
  • the second flue gas outlet communicates with the third flue gas
  • the inlet is communicated so that the flue gas is passed into the evaporator, thereby reducing the temperature of the flue gas
  • the second water outlet is communicated with the first water inlet so that the water in the steam generator return to said waste heat boiler;
  • a low-temperature adsorption tower the low-temperature adsorption tower includes a fourth flue gas inlet and a fourth flue gas outlet, the third flue gas outlet communicates with the fourth flue gas inlet, so that the flue gas is passed into the low-temperature In the adsorption tower, the flue gas is desulfurized and denitrified.
  • the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application cools the flue gas through the waste heat boiler to reduce the temperature of the flue gas. After cooling, the flue gas is desulfurized in the desulfurization tower. The efficiency is high, so the desulfurization rate of the low-temperature desulfurization and denitrification system for coking plant flue gas 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 denitrification rate of the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment, wherein the denitrification rate of the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application can reach 98%.
  • the low-temperature desulfurization and denitration system for coking plant flue gas in the embodiment of the present application performs multiple desulfurization treatments on the flue gas, thereby increasing the desulfurization rate of the low-temperature desulfurization and denitrification method for coking plant flue gas in the embodiment of the present application .
  • the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application has the advantages of high desulfurization rate and high denitrification rate.
  • the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application further includes a dust collector, the dust collector includes an air inlet and an air outlet, and the air inlet and the second flue gas The gas outlet is connected so that the flue gas is passed into the dust collector,
  • the gas outlet communicates with the third flue gas inlet, so that the second flue gas outlet communicates with the third flue gas inlet.
  • the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application further includes a dust collector and a recooler, and the recooler includes a fifth flue gas inlet and a fifth flue gas outlet , the fifth flue gas inlet communicates with the gas outlet, so that the flue gas is passed into the recooler, thereby reducing the temperature of the flue gas,
  • the fifth flue gas outlet communicates with the third flue gas inlet, so that the gas outlet communicates with the third flue gas inlet.
  • the recooler further includes a seventh flue gas inlet and a seventh flue gas outlet, and the seventh flue gas inlet communicates with the fourth flue gas outlet so as to pass the flue gas into In the regenerator, the regenerator is cooled.
  • the recooler includes a first heat exchange component and a second heat exchange component, the first heat exchange component can exchange heat with the second heat exchange component, and the first heat exchange component Including the fifth flue gas inlet and the fifth flue gas outlet, the second heat exchange assembly includes the seventh flue gas inlet and the seventh flue gas outlet.
  • the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application further includes a dust collector and a water cooler, and the water cooler includes a sixth flue gas inlet and a sixth flue gas outlet, so The sixth flue gas inlet is communicated with the gas outlet, so that the flue gas is passed into the water cooler, thereby reducing the temperature of the flue gas,
  • the sixth flue gas outlet communicates with the fifth flue gas inlet, so that the gas outlet communicates with the fifth flue gas inlet.
  • the water cooler further includes a third water inlet and a third water outlet, and the third water inlet is used for passing cooling water into the water cooler so as to cool the water cooler.
  • the water cooler includes a third heat exchange component and a fourth heat exchange component
  • the third heat exchange component can exchange heat with the fourth heat exchange component
  • the third heat exchange component includes The sixth flue gas inlet and the sixth flue gas outlet
  • the fourth heat exchange component includes the third water inlet and the third water outlet.
  • the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application further includes a dust collector, and further includes:
  • An induced fan the induced fan includes an air inlet and an air outlet, the air inlet of the induced fan communicates with the seventh flue gas outlet, and the air outlet of the induced fan communicates with the chimney, so that the flue gas emission.
  • the desulfurization tower is provided with active coke for desulfurization.
  • Fig. 1 is a schematic structural diagram of a low-temperature desulfurization and denitrification system for coking plant flue gas according to an embodiment of the present application.
  • Fig. 2 is a schematic structural diagram of a low-temperature desulfurization and denitrification system for coking plant flue gas according to an embodiment of the present application.
  • Waste heat boiler 1 first flue gas inlet 11; first flue gas outlet 12; first water outlet 13; first water inlet 14;
  • Desulfurization tower 2 second flue gas inlet 21; second flue gas outlet 22;
  • Absorption refrigeration unit 3 steam generator 31; second water inlet 311; second water outlet 312; evaporator 32; third flue gas inlet 321; third flue gas outlet 322;
  • Low temperature adsorption tower 4 Low temperature adsorption tower 4; fourth flue gas inlet 41; fourth flue gas outlet 42;
  • Dust collector 5 air inlet 51; air outlet 52; dust outlet 53;
  • Recooler 6 first heat exchange component 61; fifth flue gas inlet 611; fifth flue gas outlet 612; second heat exchange component 62; seventh flue gas inlet 621; seventh flue gas outlet 622;
  • Water cooler 7 third heat exchange component 71; sixth flue gas inlet 711; sixth flue gas outlet 712; fourth heat exchange component 72; third water inlet 721; third water outlet 722;
  • the low-temperature desulfurization and denitrification system for coking plant flue gas includes a waste heat boiler 1 , a desulfurization tower 2 , an absorption refrigeration unit 3 and a low-temperature adsorption tower 4 .
  • the waste heat boiler 1 includes a first flue gas inlet 11 , a first flue gas outlet 12 , a first water outlet 13 and a first water inlet 14 , and flue gas can enter the waste heat boiler 1 through the first flue gas inlet 11 .
  • the flue gas discharged from the coking plant enters the waste heat boiler 1 through the first flue gas inlet 11 .
  • the heat exchange between the flue gas and the waste heat boiler 1 can reduce the temperature of the high-temperature flue gas after the heat exchange between the flue gas and the waste heat boiler 1.
  • the water in boiler 1 heats up to hot water after absorbing the heat of the flue gas.
  • the cooled flue gas is discharged from the first flue gas outlet 12 of the waste heat boiler 1 .
  • the desulfurization tower 2 includes a second flue gas inlet 21 and a second flue gas outlet 22, the first flue gas outlet 12 communicates with the second flue gas inlet 21, so that the flue gas is passed into the desulfurization tower 2, thereby desulfurizing the flue gas .
  • the flue gas discharged from the waste heat boiler 1 enters the desulfurization tower 2 through the second flue gas inlet 21, and the flue gas is desulfurized and denitrified in the desulfurization tower 2, thereby removing sulfur compounds in the flue gas.
  • the flue gas is desulfurized, it is discharged from the second flue gas outlet 22 of the desulfurization tower 2 .
  • the height of the tower body of the desulfurization tower 2 is large, so that the flue gas in the desulfurization tower 24 can fully react in the desulfurization tower 2.
  • the desulfurization rate of gas low temperature desulfurization and denitrification method is large, so that the flue gas in the desulfurization tower 24 can fully react in the desulfurization tower 2.
  • the absorption refrigeration unit 3 includes a steam generator 31 and an evaporator 32, the steam generator 31 includes a second water inlet 311, the evaporator 32 includes a third flue gas inlet 321 and a third flue gas outlet 322, the first water outlet 13 and The second water inlet 311 is communicated so as to pass the hot water in the waste heat boiler 1 into the steam generator 31 , the second flue gas outlet 22 is communicated with the third flue gas inlet 321 so as to pass the flue gas into the evaporator 32 , Thereby reducing the temperature of the flue gas.
  • the flue gas treated by the desulfurization tower 2 enters the evaporator 32 through the third flue gas inlet 321, and the flue gas enters the evaporator 32 to exchange heat with the evaporator 32, thereby making the evaporator 32 to reduce the temperature of the flue gas to below 20° C., and the flue gas cooled by the evaporator 32 is discharged from the evaporator 32 through the third flue gas outlet 322 .
  • the second water outlet 312 communicates with the first water inlet 14 so that the water in the steam generator can flow back into the waste heat boiler.
  • the second water inlet 311 of the steam generator 31 communicates with the first water outlet 13 of the waste heat boiler 1
  • the first water inlet 14 of the waste heat boiler 1 communicates with the second water outlet 312 of the steam generator 31 .
  • the hot water in the waste heat boiler 1 is discharged from the first water outlet 13 and enters the steam generator 31 through the second water inlet 311 .
  • the hot water is discharged through the second water outlet 312 after being cooled by the steam generator 31 , and enters the waste heat boiler 1 from the first water inlet 14 of the waste heat boiler 1 to cool down the flue gas flowing into the waste heat boiler 1 .
  • the water in the waste heat boiler 1 can be recycled, so the utilization rate of water is improved.
  • the low-temperature adsorption tower 4 comprises a fourth flue gas inlet 41 and a fourth flue gas outlet 42, and the third flue gas outlet 322 is communicated with the fourth flue gas inlet 41, so that the flue gas is passed into the low-temperature adsorption tower 4, thereby the flue gas Carry out desulfurization and denitrification.
  • the cooled flue gas is discharged through the third flue gas outlet 322 of the evaporator 32, and enters the low-temperature adsorption tower 4 from the fourth flue gas inlet 41 of the low-temperature adsorption tower 4,
  • the desulfurization and denitrification treatment is carried out, and the flue gas after the desulfurization and denitrification treatment is discharged to the outside through the fourth flue gas outlet 42 .
  • the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application cools the flue gas through the waste heat boiler 1 to reduce the temperature of the flue gas. After cooling, the flue gas is desulfurized in the desulfurization tower 2, and the flue gas after cooling The desulfurization efficiency is high, so the desulfurization rate of the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application is increased.
  • the flue gas desulfurized by the desulfurization tower 2 is cooled again by the absorption refrigeration unit 3, and the flue gas after cooling is subjected to desulfurization and denitration treatment in the low-temperature adsorption tower 4.
  • the flue gas denitrification efficiency after cooling again is high, so the increase
  • the denitrification rate of the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application is shown, wherein the denitrification rate of the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application can reach 98%.
  • the low-temperature desulfurization and denitration system for coking plant flue gas in the embodiment of the present application performs multiple desulfurization treatments on the flue gas, thereby increasing the desulfurization rate of the low-temperature desulfurization and denitrification method for coking plant flue gas in the embodiment of the present application .
  • the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application has the advantages of high desulfurization rate and high denitrification rate.
  • the desulfurization tower 2 is provided with active coke for desulfurization.
  • activated coke has a catalytic effect on the reaction of sulfur-containing compounds and oxygen in flue gas, and the surface of activated coke has micropores, which can absorb the reaction products of sulfur-containing compounds and oxygen, thereby achieving the goal of desulfurization. Effect.
  • slaked lime may also be provided in the desulfurization tower 2 .
  • the desulfurization tower 2 desulfurizes the flue gas by reacting slaked lime with the flue gas, so the desulfurization tower 2 can remove sulfur compounds in the flue gas.
  • the desulfurization treatment of the flue gas by the desulfurization tower 2 includes dry desulfurization and semi-dry desulfurization.
  • dry desulfurization is used to remove sulfur-containing compounds in the flue dust, wherein dry slaked lime is used as an absorbent, and the flue gas in the desulfurization tower 2 is reacted with dry slaked lime, thereby removing sulfur-containing compounds in the flue gas; or,
  • the semi-dry desulfurization method is used to remove the sulfur compounds in the flue dust.
  • the hydrated lime slurry is sprayed in the desulfurization tower 2, so that the hydrated lime slurry is evenly distributed in the desulfurization tower 2, and the flue gas reacts with the hydrated lime in the desulfurization tower 2, thereby removing sulfur compounds in the flue gas.
  • the low-temperature adsorption tower 4 is provided with activated carbon.
  • the activated carbon has a catalytic effect on the reaction of sulfur-containing compounds and oxygen in the flue gas, and the surface of the activated carbon has micropores, which can absorb sulfur-containing The product of the reaction between the compound and oxygen, and then achieve the effect of desulfurization.
  • activated carbon can perform catalytic reduction reaction on NO in the flue gas, and reduce NO to N2 under the action of reducing agent NH3, so as to achieve the purpose of denitrification and deamination.
  • the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application further includes a dust collector 5, and the dust collector 5 includes an air inlet 51 and an air outlet 52, and the air inlet 51 communicates with the second flue gas outlet 22 so as to pass the flue gas into the dust collector 5 , and the gas outlet 52 communicates with the third flue gas inlet 321 so that the second flue gas outlet 22 communicates with the third flue gas inlet 321 .
  • the flue gas treated by the desulfurization tower 2 is discharged from the second flue gas outlet 22, and enters the dust collector 5 through the air inlet 51, and the dust collector 5 performs dust removal treatment on the flue gas, wherein the dust collector 5 can remove the flue gas
  • the soot and active coke in the dust and the flue gas after dedusting are discharged from the gas outlet 52 of the dust collector 5 .
  • the dust collector 5 also includes a dust outlet 53, wherein the dust and active coke removed from the flue gas are discharged from the dust outlet 53 of the dust collector 5, thereby preventing the dust and active coke remaining in the dust collector 5 from causing secondary damage to the flue gas. secondary pollution.
  • the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application further includes a recooler 6, and the recooler 6 includes a fifth flue gas inlet 611 and a fifth flue gas inlet 611.
  • the gas outlet 612, the fifth flue gas inlet 611 communicates with the gas outlet 52, so as to pass the flue gas into the recooler 6, thereby reducing the temperature of the flue gas, the fifth flue gas outlet 612 communicates with the third flue gas inlet 321, Such that the gas outlet 52 communicates with the third flue gas inlet 321 .
  • the dust treated by the dust collector 5 is discharged through the gas outlet 52, enters the recooler 6 through the fifth flue gas inlet 611, and the recooler 6 cools the flue gas, and the cooled flue gas is cooled from the recooler
  • the fifth flue gas outlet 612 of the device 6 is discharged into the evaporator 32 through the third flue gas inlet 321, and then the flue gas is cooled again.
  • the recooler 6 further includes a seventh flue gas inlet 621 and a seventh flue gas outlet 622, the seventh flue gas inlet 621 communicates with the fourth flue gas outlet 42, so that the flue gas can be passed into the recooler 6, so as to cool the recooler 6.
  • the flue gas treated by the low-temperature adsorption tower 4 is discharged from the fourth flue gas outlet 42 and enters the recooler 6 through the seventh flue gas inlet 621 .
  • the flue gas is discharged from the seventh flue gas outlet 622 of the recooler 6 .
  • the recooler 6 includes a first heat exchange assembly 61 and a second heat exchange assembly 62, the first heat exchange assembly 61 can exchange heat with the second heat exchange assembly 62, and the first heat exchange assembly 61 includes the fifth flue gas Inlet 611 and fifth flue gas outlet 612.
  • the second heat exchange component 62 includes a seventh flue gas inlet 621 and a seventh flue gas outlet 622 .
  • the flue gas treated by the dust collector 5 enters the first heat exchange assembly 61 from the fifth flue gas inlet 611, and the flue gas discharged from the cryogenic adsorption tower 4 enters through the seventh flue gas inlet 621.
  • the second heat exchanging component 62, the flue gas in the first heat exchanging component 61 exchanges heat with the flue gas in the second heat exchanging component 62 through the first heat exchanging component 61, thereby reducing the temperature.
  • the flue gas discharged from the low-temperature adsorption tower 4 is cooled through the recooler 6, and after the recooler 6 is cooled, the temperature is lowered again by the evaporator 32. Therefore, the temperature of the flue gas discharged from the low-temperature adsorption tower 4 lower than the temperature of the flue gas in the first heat exchange assembly 61, that is, the temperature of the flue gas in the second heat exchange assembly 62 is lower than the temperature of the flue gas in the first heat exchange assembly 61, so the second heat exchange assembly 62 The temperature of the flue gas in the first heat exchange component 61 can be reduced.
  • the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application further includes a water cooler 7, and the water cooler 7 includes a sixth flue gas inlet 711 and a sixth flue gas outlet 712, the sixth flue gas inlet 711 communicates with the gas outlet 52, so as to pass the flue gas into the water cooler 7, thereby reducing the temperature of the flue gas, and the sixth flue gas outlet 712 communicates with the fifth flue gas inlet 611, so that the The gas port 52 communicates with the fifth flue gas inlet 611 .
  • the dust treated by the dust collector 5 is discharged through the exhaust port, and enters the water cooler 7 through the sixth flue gas inlet 711, and further, the water cooler 7 performs cooling treatment on the flue gas.
  • the cooled flue gas is discharged from the sixth flue gas outlet 712 and enters the recooler 6 through the fifth flue gas inlet 611 .
  • the water cooler 7 further includes a third water inlet 721 and a third water outlet 722 , the third water inlet 721 is used to feed cooling water into the water cooler 7 so as to cool the water cooler 7 .
  • the cooling water enters the water cooler 7 from the third water inlet 721 to exchange heat with the flue gas of the water cooler 7, thereby reducing the temperature of the flue gas.
  • the cooling water that has exchanged heat with the flue gas is discharged from the third water outlet 722 .
  • the water cooler 7 includes a third heat exchange assembly 71 and a fourth heat exchange assembly 72
  • the third heat exchange assembly 71 can exchange heat with the fourth heat exchange assembly 72
  • the third heat exchange assembly 71 includes a sixth flue gas inlet 711 and the sixth flue gas outlet 712
  • the fourth heat exchange component 72 includes a third water inlet 721 and a third water outlet 722 .
  • the flue gas treated by the dust collector 5 enters the third heat exchange assembly 71 from the sixth flue gas inlet 711, and the cooling water enters the fourth heat exchange assembly 72 from the third water inlet 721, so that the flue gas can pass through
  • the third heat exchange component 71 exchanges heat with the cooling water in the fourth heat exchange component 72 .
  • the treated flue gas is discharged from the sixth flue gas outlet 712 of the third heat exchange component 71 , and the cooling water after heat exchange with the flue gas is discharged from the third water outlet 722 of the fourth heat exchange component 72 .
  • the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application includes a chimney 9 and an induced draft fan 8 .
  • the induced fan 8 includes an air inlet 81 and an air outlet 82.
  • the air inlet 81 of the induced fan 8 communicates with the seventh flue gas outlet 622, and the air outlet 82 of the induced fan 8 communicates with the chimney 9 to discharge the flue gas.
  • the flue gas discharged from the evaporator 32 is discharged from the seventh flue gas outlet 622 into the induced draft fan 8 , further, the flue gas is discharged from the air outlet 82 of the induced draft fan 8 .
  • the induced draft fan 8 can achieve the circulation speed of flue gas in the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application.
  • first and second are used for descriptive purposes only, and cannot be understood 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

The present application discloses a low-temperature desulfurization and denitrification system for coking plant flue gas. The low-temperature desulfurization and denitrification system for coking plant flue gas comprises: a waste heat boiler, a desulfurization tower, an absorption refrigeration unit and a low-temperature adsorption tower. The waste heat boiler comprises a first flue gas inlet, a first flue gas outlet, a first water outlet and a first water inlet. The desulfurization tower comprises a second flue gas inlet and a second flue gas outlet. The first flue gas outlet communicates with the second flue gas inlet. The absorption refrigeration unit comprises a third flue gas inlet and a third flue gas outlet. The low-temperature adsorption tower comprises a fourth flue gas inlet and a fourth flue gas outlet. The third flue gas outlet communicates with the fourth flue gas inlet. The low-temperature desulfurization and denitrification system for coking plant flue gas of the present application has the advantages of a high desulfurization rate and a high denitration rate.

Description

用于焦化厂烟气的低温脱硫脱硝系统Low temperature desulfurization and denitrification system for coking plant flue gas
交叉引用cross reference
本申请要求在2021年9月28日提交中国国家知识产权局、申请号为202122371169.6、发明名称为“用于焦化厂烟气的低温脱硫脱硝系统”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。This application claims the priority of the Chinese patent application submitted to the State Intellectual Property Office of China on September 28, 2021, with the application number 202122371169.6 and the title of the invention "Low-temperature desulfurization and denitrification system for coking plant flue gas", the entire content of which is passed References are incorporated in this application.
技术领域technical field
本申请涉及气体净化的技术领域,具体地,涉及一种用于焦化厂烟气的低温脱硫脱硝系统。The present application relates to the technical field of gas purification, in particular to a low-temperature desulfurization and denitrification system for coking plant flue gas.
背景技术Background technique
焦炉因其生产工艺的特殊性,烟囱排放的热烟气中含二氧化硫、氮氧化物、粉尘,氮氧化物含量较高,烟气需进行脱硫脱硝除尘处理后方可满足排放要求。在相关技术中,处理焦化厂排出的烟气需要对烟气加热升温,并且相关技术的脱硝方法的脱硝效率低。Due to the particularity of the coke oven production process, the hot flue gas discharged from the chimney contains sulfur dioxide, nitrogen oxides, and dust, and the content of nitrogen oxides is high. In the related art, the treatment of the flue gas discharged from the coking plant needs to heat up the flue gas, and the denitrification method of the related art has a low denitrification efficiency.
发明内容Contents of the invention
本申请是基于发明人对以下事实和问题的发现和认识做出的:This application is based on the inventor's discovery and recognition of the following facts and problems:
焦炉烟气处理的难点在于脱硝。因为烟气中的SO 2会和NH 3进行反应,焦炉烟气的温度过低就会结晶,堵塞脱硝催化剂表面微孔,造成脱硝催化剂中毒。相关技术适用的温度范围在320℃-420℃,而从焦炉排到烟气处理设备时温度在180℃-300℃,采用相关技术处理焦炉烟气需要对焦炉烟气进行升温处理,并且相关技术的脱硝方法的脱硝效率低。 The difficulty of coke oven flue gas treatment is denitrification. Because SO 2 in the flue gas will react with NH 3 , the coke oven flue gas will crystallize if the temperature is too low, which will block the micropores on the surface of the denitrification catalyst and cause denitrification catalyst poisoning. The applicable temperature range of the relevant technology is 320°C-420°C, while the temperature from the coke oven discharge to the flue gas treatment equipment is 180°C-300°C. The use of the relevant technology to treat the coke oven flue gas requires the coke oven flue gas to be heated. Moreover, the denitration efficiency of the denitration method in the related art is low.
本申请旨在至少在一定程度上解决相关技术中的技术问题之一。为此,本申请的实施例提出一种。This application aims to solve one of the technical problems in the related art at least to a certain extent. For this reason, the embodiment of this application proposes one.
根据本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统,其特征在于,包括:The low-temperature desulfurization and denitrification system for coking plant flue gas according to the embodiment of the present application is characterized in that it includes:
余热锅炉,所述余热锅炉包括第一烟气进口、第一烟气出口、第一出水口和第一进水口,所述烟气能够通过所述第一烟气进口进入所述余热锅炉内;A waste heat boiler, the waste heat boiler includes a first flue gas inlet, a first flue gas outlet, a first water outlet and a first water inlet, and the flue gas can enter the waste heat boiler through the first flue gas inlet;
脱硫塔,所述脱硫塔包括第二烟气进口和第二烟气出口,所述第一烟气出口与所述第二烟气进口连通,以便将所述烟气通入所述脱硫塔内,从而对所述烟气进行脱硫;A desulfurization tower, the desulfurization tower includes a second flue gas inlet and a second flue gas outlet, the first flue gas outlet communicates with the second flue gas inlet, so that the flue gas is passed into the desulfurization tower , so as to desulfurize the flue gas;
吸收式制冷机组,所述吸收式制冷机组包括蒸汽发生器和蒸发器,所述蒸汽发生器包括第二进水口和第二出水口,所述蒸发器包括第三烟气进口和第三烟气出口,所述第一出水口与所述第二进水口连通,以便将所述余热锅炉中的热水通入所述蒸汽发生器内,所述 第二烟气出口与所述第三烟气进口连通,以便将所述烟气通入所述蒸发器内,从而降低所述烟气的温度,所述第二出水口与所述第一进水口连通,以便所述蒸汽发生器内的水回流到所述余热锅炉中;An absorption refrigeration unit, the absorption refrigeration unit includes a steam generator and an evaporator, the steam generator includes a second water inlet and a second water outlet, and the evaporator includes a third flue gas inlet and a third flue gas outlet, the first water outlet communicates with the second water inlet so as to pass the hot water in the waste heat boiler into the steam generator, and the second flue gas outlet communicates with the third flue gas The inlet is communicated so that the flue gas is passed into the evaporator, thereby reducing the temperature of the flue gas, and the second water outlet is communicated with the first water inlet so that the water in the steam generator return to said waste heat boiler;
低温吸附塔,所述低温吸附塔包括第四烟气进口和第四烟气出口,所述第三烟气出口与所述第四烟气进口连通,以便将所述烟气通入所述低温吸附塔内,从而对所述烟气进行脱硫、脱硝。A low-temperature adsorption tower, the low-temperature adsorption tower includes a fourth flue gas inlet and a fourth flue gas outlet, the third flue gas outlet communicates with the fourth flue gas inlet, so that the flue gas is passed into the low-temperature In the adsorption tower, the flue gas is desulfurized and denitrified.
本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统通过余热锅炉对烟气降温,使烟气的温度降低,降温后烟气在脱硫塔进行脱硫处理,经过降温后的烟气的脱硫效率高,因此增大了本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统的脱硫率。经过脱硫塔脱硫处理后的烟气通过吸收式制冷机组进行再次降温,降温后的烟气在低温吸附塔内进行脱硫脱硝处理,经过再次降温后的烟气脱硝效率高,因此增大了本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统的脱硝率,其中本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统的脱硝率可达98%。The low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application cools the flue gas through the waste heat boiler to reduce the temperature of the flue gas. After cooling, the flue gas is desulfurized in the desulfurization tower. The efficiency is high, so the desulfurization rate of the low-temperature desulfurization and denitrification system for coking plant flue gas 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 denitrification rate of the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment, wherein the denitrification rate of the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application can reach 98%.
此外,本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统对烟气进行多次脱硫处理,进而增大了本申请实施例的用于焦化厂烟气的低温脱硫脱硝方法的脱硫率。In addition, the low-temperature desulfurization and denitration system for coking plant flue gas in the embodiment of the present application performs multiple desulfurization treatments on the flue gas, thereby increasing the desulfurization rate of the low-temperature desulfurization and denitrification method for coking plant flue gas in the embodiment of the present application .
由此,本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统的脱硫率高和脱硝率高的优点。Therefore, the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application has the advantages of high desulfurization rate and high denitrification rate.
在一些实施例中,本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统还包括除尘器,所述除尘器包括进气口和出气口,所述进气口与所述第二烟气出口连通,以便将所述烟气通入所述除尘器,In some embodiments, the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application further includes a dust collector, the dust collector includes an air inlet and an air outlet, and the air inlet and the second flue gas The gas outlet is connected so that the flue gas is passed into the dust collector,
所述出气口与所述第三烟气进口连通,以使第二烟气出口与所述第三烟气进口连通。The gas outlet communicates with the third flue gas inlet, so that the second flue gas outlet communicates with the third flue gas inlet.
在一些实施例中,本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统还包括除尘器,还包括回冷器,所述回冷器包括第五烟气进口和第五烟气出口,所述第五烟气进口与所述出气口连通,以便将所述烟气通入所述回冷器内,从而降低所述烟气的温度,In some embodiments, the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application further includes a dust collector and a recooler, and the recooler includes a fifth flue gas inlet and a fifth flue gas outlet , the fifth flue gas inlet communicates with the gas outlet, so that the flue gas is passed into the recooler, thereby reducing the temperature of the flue gas,
所述第五烟气出口与所述第三烟气进口连通,以使所述出气口与所述第三烟气进口连通。The fifth flue gas outlet communicates with the third flue gas inlet, so that the gas outlet communicates with the third flue gas inlet.
在一些实施例中,所述回冷器还包括第七烟气进口和第七烟气出口,所述第七烟气进口与所述第四烟气出口连通,以便将所述烟气通入所述回冷器内,从而对所述回冷器进行冷却。In some embodiments, the recooler further includes a seventh flue gas inlet and a seventh flue gas outlet, and the seventh flue gas inlet communicates with the fourth flue gas outlet so as to pass the flue gas into In the regenerator, the regenerator is cooled.
在一些实施例中,所述回冷器包括第一换热组件和第二换热组件,所述第一换热组件能够和所述第二换热组件换热,所述第一换热组件包括所述第五烟气进口和所述第五烟气出口,所述第二换热组件包括所述第七烟气进口和所述第七烟气出口。In some embodiments, the recooler includes a first heat exchange component and a second heat exchange component, the first heat exchange component can exchange heat with the second heat exchange component, and the first heat exchange component Including the fifth flue gas inlet and the fifth flue gas outlet, the second heat exchange assembly includes the seventh flue gas inlet and the seventh flue gas outlet.
在一些实施例中,本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统还包括除尘器,还包括水冷器,所述水冷器包括第六烟气进口和第六烟气出口,所述第六烟气进口与所述出气口连通,以便将所述烟气通入所述水冷器内,从而降低所述烟气的温度,In some embodiments, the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application further includes a dust collector and a water cooler, and the water cooler includes a sixth flue gas inlet and a sixth flue gas outlet, so The sixth flue gas inlet is communicated with the gas outlet, so that the flue gas is passed into the water cooler, thereby reducing the temperature of the flue gas,
所述第六烟气出口与所述第五烟气进口连通,以使所述出气口与所述第五烟气进口连通。The sixth flue gas outlet communicates with the fifth flue gas inlet, so that the gas outlet communicates with the fifth flue gas inlet.
在一些实施例中,所述水冷器还包括第三进水口和第三出水口,所述第三进水口用于向所述水冷器通入冷却水,以便对所述水冷器进行冷却。In some embodiments, the water cooler further includes a third water inlet and a third water outlet, and the third water inlet is used for passing cooling water into the water cooler so as to cool the water cooler.
在一些实施例中,所述水冷器包括第三换热组件和第四换热组件,所述第三换热组件能够与所述第四换热组件换热,所述第三换热组件包括所述第六烟气进口和所述第六烟气出口,所述第四换热组件包括所述第三进水口和所述第三出水口。In some embodiments, the water cooler includes a third heat exchange component and a fourth heat exchange component, the third heat exchange component can exchange heat with the fourth heat exchange component, and the third heat exchange component includes The sixth flue gas inlet and the sixth flue gas outlet, the fourth heat exchange component includes the third water inlet and the third water outlet.
在一些实施例中,本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统还包括除尘器,还包括:In some embodiments, the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application further includes a dust collector, and further includes:
烟筒,所述烟筒;和chimney, said chimney; and
引风机,所述引风机包括进风口和出风口,所述引风机的进风口与所述第七烟气出口连通,所述引风机的出风口与所述烟筒连通,从而将所述烟气排放。An induced fan, the induced fan includes an air inlet and an air outlet, the air inlet of the induced fan communicates with the seventh flue gas outlet, and the air outlet of the induced fan communicates with the chimney, so that the flue gas emission.
在一些实施例中,所述脱硫塔内设有用于脱硫的活性焦。In some embodiments, the desulfurization tower is provided with active coke for desulfurization.
附图说明Description of drawings
图1是本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统的结构示意图。Fig. 1 is a schematic structural diagram of a low-temperature desulfurization and denitrification system for coking plant flue gas according to an embodiment of the present application.
图2是本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统的结构示意图。Fig. 2 is a schematic structural diagram of a low-temperature desulfurization and denitrification system for coking plant flue gas according to an embodiment of the present application.
附图标记:Reference signs:
余热锅炉1;第一烟气进口11;第一烟气出口12;第一出水口13;第一进水口14; Waste heat boiler 1; first flue gas inlet 11; first flue gas outlet 12; first water outlet 13; first water inlet 14;
脱硫塔2;第二烟气进口21;第二烟气出口22; Desulfurization tower 2; second flue gas inlet 21; second flue gas outlet 22;
吸收式制冷机组3;蒸汽发生器31;第二进水口311;第二出水口312;蒸发器32;第三烟气进口321;第三烟气出口322;Absorption refrigeration unit 3; steam generator 31; second water inlet 311; second water outlet 312; evaporator 32; third flue gas inlet 321; third flue gas outlet 322;
低温吸附塔4;第四烟气进口41;第四烟气出口42;Low temperature adsorption tower 4; fourth flue gas inlet 41; fourth flue gas outlet 42;
除尘器5;进气口51;出气口52;出尘口53; Dust collector 5; air inlet 51; air outlet 52; dust outlet 53;
回冷器6;第一换热组件61;第五烟气进口611;第五烟气出口612;第二换热组件62;七烟气进口621;第七烟气出口622; Recooler 6; first heat exchange component 61; fifth flue gas inlet 611; fifth flue gas outlet 612; second heat exchange component 62; seventh flue gas inlet 621; seventh flue gas outlet 622;
水冷器7;第三换热组件71;第六烟气进口711;第六烟气出口712;第四换热组件72;第三进水口721;第三出水口722; Water cooler 7; third heat exchange component 71; sixth flue gas inlet 711; sixth flue gas outlet 712; fourth heat exchange component 72; third water inlet 721; third water outlet 722;
引风机8;进风口81;出风口82;induced draft fan 8; air inlet 81; air outlet 82;
烟筒9。chimney9.
具体实施方式Detailed ways
下面详细描述本申请的实施例,所述实施例的示例在附图中示出。下面通过参考附图描述的实施例是示例性的,旨在用于解释本申请,而不能理解为对本申请的限制。Embodiments of the application are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary, and are intended to explain the present application, and should not be construed as limiting the present application.
如图1所示,根据本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统包括余热锅炉1、脱硫塔2、吸收式制冷机组3和低温吸附塔4。As shown in FIG. 1 , the low-temperature desulfurization and denitrification system for coking plant flue gas according to the embodiment of the present application includes a waste heat boiler 1 , a desulfurization tower 2 , an absorption refrigeration unit 3 and a low-temperature adsorption tower 4 .
余热锅炉1包括第一烟气进口11、第一烟气出口12、第一出水口13和第一进水口14,烟气能够通过第一烟气进口11进入余热锅炉1内。The waste heat boiler 1 includes a first flue gas inlet 11 , a first flue gas outlet 12 , a first water outlet 13 and a first water inlet 14 , and flue gas can enter the waste heat boiler 1 through the first flue gas inlet 11 .
具体地,如图1所示,从焦化厂排出的烟气(烟气温度在180℃-300℃)经过第一烟气进口11进入余热锅炉1中。可以理解的是,烟气与余热锅炉1进行换热,烟气与余热锅炉1换热后能够降低高温烟气的温度,其中降低温度后的烟气的温度在180℃-300℃,并且余热锅炉1中的水吸收烟气的热量后升温成热水。降温后的烟气从余热锅炉1的第一烟气出口12中排出。Specifically, as shown in FIG. 1 , the flue gas discharged from the coking plant (the flue gas temperature is 180°C-300°C) enters the waste heat boiler 1 through the first flue gas inlet 11 . It can be understood that the heat exchange between the flue gas and the waste heat boiler 1 can reduce the temperature of the high-temperature flue gas after the heat exchange between the flue gas and the waste heat boiler 1. The water in boiler 1 heats up to hot water after absorbing the heat of the flue gas. The cooled flue gas is discharged from the first flue gas outlet 12 of the waste heat boiler 1 .
脱硫塔2包括第二烟气进口21和第二烟气出口22,第一烟气出口12与第二烟气进口21连通,以便将烟气通入脱硫塔2内,从而对烟气进行脱硫。具体地,从余热锅炉1排出的烟气经过第二烟气进口21进入脱硫塔2中,烟气在脱硫塔2进行脱硫和脱硝处理,进而去除烟气中的含硫化合物。当烟气经过脱硫处理后,从脱硫塔2的第二烟气出口22排出。The desulfurization tower 2 includes a second flue gas inlet 21 and a second flue gas outlet 22, the first flue gas outlet 12 communicates with the second flue gas inlet 21, so that the flue gas is passed into the desulfurization tower 2, thereby desulfurizing the flue gas . Specifically, the flue gas discharged from the waste heat boiler 1 enters the desulfurization tower 2 through the second flue gas inlet 21, and the flue gas is desulfurized and denitrified in the desulfurization tower 2, thereby removing sulfur compounds in the flue gas. After the flue gas is desulfurized, it is discharged from the second flue gas outlet 22 of the desulfurization tower 2 .
可以理解的是,脱硫塔2的塔身高度尺寸大,进而使脱硫塔24中的烟气能够在脱硫塔2内充分发生反应,因此本申请实施例的增大了垃圾电厂回转窑燃烧炉烟气低温脱硫脱硝方法的脱硫率。It can be understood that the height of the tower body of the desulfurization tower 2 is large, so that the flue gas in the desulfurization tower 24 can fully react in the desulfurization tower 2. The desulfurization rate of gas low temperature desulfurization and denitrification method.
吸收式制冷机组3包括蒸汽发生器31和蒸发器32,蒸汽发生器31包括第二进水口311,蒸发器32包括第三烟气进口321和第三烟气出口322,第一出水口13与第二进水口311连通,以便将余热锅炉1中的热水通入蒸汽发生器31内,第二烟气出口22与第三烟气进口321连通,以便将烟气通入蒸发器32内,从而降低烟气的温度。The absorption refrigeration unit 3 includes a steam generator 31 and an evaporator 32, the steam generator 31 includes a second water inlet 311, the evaporator 32 includes a third flue gas inlet 321 and a third flue gas outlet 322, the first water outlet 13 and The second water inlet 311 is communicated so as to pass the hot water in the waste heat boiler 1 into the steam generator 31 , the second flue gas outlet 22 is communicated with the third flue gas inlet 321 so as to pass the flue gas into the evaporator 32 , Thereby reducing the temperature of the flue gas.
具体地,如图1所示,经过脱硫塔2处理后的烟气通过第三烟气进口321进入蒸发器32中,烟气进入蒸发器32后与蒸发器32进行换热,进而使蒸发器32将烟气的温度降低至20℃以下,经过蒸发器32降温后的烟气从第三烟气出口322排出蒸发器32。Specifically, as shown in Figure 1, the flue gas treated by the desulfurization tower 2 enters the evaporator 32 through the third flue gas inlet 321, and the flue gas enters the evaporator 32 to exchange heat with the evaporator 32, thereby making the evaporator 32 to reduce the temperature of the flue gas to below 20° C., and the flue gas cooled by the evaporator 32 is discharged from the evaporator 32 through the third flue gas outlet 322 .
此外,第二出水口312与第一进水口14连通,以便蒸汽发生器内的水回流到余热锅炉中。其中蒸汽发生器31的第二进水口311与余热锅炉1的第一出水口13连通,余热锅炉1的第一进水口14与蒸汽发生器31的第二出水口312连通。其中余热锅炉1中的热水从第一出水口13排出,通过第二进水口311进入蒸汽发生器31中。热水在蒸汽发生器31进行降温处理后,通过第二出水口312排出,并从余热锅炉1的第一进水口14进入余热锅炉1中,对通入余热锅炉1的烟气进行降温处理。进而余热锅炉1中的水能够循环使用,因 此提高了水的利用率。In addition, the second water outlet 312 communicates with the first water inlet 14 so that the water in the steam generator can flow back into the waste heat boiler. The second water inlet 311 of the steam generator 31 communicates with the first water outlet 13 of the waste heat boiler 1 , and the first water inlet 14 of the waste heat boiler 1 communicates with the second water outlet 312 of the steam generator 31 . The hot water in the waste heat boiler 1 is discharged from the first water outlet 13 and enters the steam generator 31 through the second water inlet 311 . The hot water is discharged through the second water outlet 312 after being cooled by the steam generator 31 , and enters the waste heat boiler 1 from the first water inlet 14 of the waste heat boiler 1 to cool down the flue gas flowing into the waste heat boiler 1 . Furthermore, the water in the waste heat boiler 1 can be recycled, so the utilization rate of water is improved.
低温吸附塔4包括第四烟气进口41和第四烟气出口42,第三烟气出口322与第四烟气进口41连通,以便将烟气通入低温吸附塔4内,从而对烟气进行脱硫、脱硝。The low-temperature adsorption tower 4 comprises a fourth flue gas inlet 41 and a fourth flue gas outlet 42, and the third flue gas outlet 322 is communicated with the fourth flue gas inlet 41, so that the flue gas is passed into the low-temperature adsorption tower 4, thereby the flue gas Carry out desulfurization and denitrification.
具体地,如图1所示,具体地,经过降温的烟气经过蒸发器32的第三烟气出口322排出,并且从低温吸附塔4的第四烟气进口41进入低温吸附塔4内,进行脱硫和脱硝处理,经过脱硫和脱硝处理的烟气从第四烟气出口42排放到外界。Specifically, as shown in FIG. 1 , specifically, the cooled flue gas is discharged through the third flue gas outlet 322 of the evaporator 32, and enters the low-temperature adsorption tower 4 from the fourth flue gas inlet 41 of the low-temperature adsorption tower 4, The desulfurization and denitrification treatment is carried out, and the flue gas after the desulfurization and denitrification treatment is discharged to the outside through the fourth flue gas outlet 42 .
本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统通过余热锅炉1对烟气降温,使烟气的温度降低,降温后烟气在脱硫塔2进行脱硫处理,经过降温后的烟气的脱硫效率高,因此增大了本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统的脱硫率。经过脱硫塔2脱硫处理后的烟气通过吸收式制冷机组3进行再次降温,降温后的烟气在低温吸附塔4内进行脱硫脱硝处理,经过再次降温后的烟气脱硝效率高,因此增大了本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统的脱硝率,其中本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统的脱硝率可达98%。The low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application cools the flue gas through the waste heat boiler 1 to reduce the temperature of the flue gas. After cooling, the flue gas is desulfurized in the desulfurization tower 2, and the flue gas after cooling The desulfurization efficiency is high, so the desulfurization rate of the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application is increased. The flue gas desulfurized by the desulfurization tower 2 is cooled again by the absorption refrigeration unit 3, and the flue gas after cooling is subjected to desulfurization and denitration treatment in the low-temperature adsorption tower 4. The flue gas denitrification efficiency after cooling again is high, so the increase The denitrification rate of the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application is shown, wherein the denitrification rate of the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application can reach 98%.
此外,本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统对烟气进行多次脱硫处理,进而增大了本申请实施例的用于焦化厂烟气的低温脱硫脱硝方法的脱硫率。In addition, the low-temperature desulfurization and denitration system for coking plant flue gas in the embodiment of the present application performs multiple desulfurization treatments on the flue gas, thereby increasing the desulfurization rate of the low-temperature desulfurization and denitrification method for coking plant flue gas in the embodiment of the present application .
由此,本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统的脱硫率高和脱硝率高的优点。Therefore, the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application has the advantages of high desulfurization rate and high denitrification rate.
在一些实施例中,脱硫塔2内设有用于脱硫的活性焦。可以理解的是,活性焦对烟气中的含硫化合物和氧气的反应具有催化作用,并且活性焦的表面上具有微孔,能够吸附含硫化合物和氧气的反应后的产物,进而达到脱硫的效果。In some embodiments, the desulfurization tower 2 is provided with active coke for desulfurization. It can be understood that activated coke has a catalytic effect on the reaction of sulfur-containing compounds and oxygen in flue gas, and the surface of activated coke has micropores, which can absorb the reaction products of sulfur-containing compounds and oxygen, thereby achieving the goal of desulfurization. Effect.
在一些实施例中,脱硫塔2内还可以设有熟石灰。具体地,脱硫塔2通过熟石灰与烟气进行反应进而对烟气进行脱硫处理,因此脱硫塔2能够去除烟气中的含硫化合物。其中,脱硫塔2对烟气进行脱硫处理包括干法脱硫和半干法脱硫。In some embodiments, slaked lime may also be provided in the desulfurization tower 2 . Specifically, the desulfurization tower 2 desulfurizes the flue gas by reacting slaked lime with the flue gas, so the desulfurization tower 2 can remove sulfur compounds in the flue gas. Wherein, the desulfurization treatment of the flue gas by the desulfurization tower 2 includes dry desulfurization and semi-dry desulfurization.
可选的,采用干法脱硫去除烟尘中的含硫化合物,其中干燥的熟石灰作为吸收剂,将脱硫塔2中的烟气与干燥的熟石灰反应,进而去除烟气中的含硫化合物;或者,采用半干法脱硫去除烟尘中的含硫化合物。其中,将熟石灰浆喷洒在脱硫塔2内,使熟石灰浆在脱硫塔2均匀地分布在脱硫塔2内,使烟气与脱硫塔2内的熟石灰反应,进而去除烟气中的含硫化合物。Optionally, dry desulfurization is used to remove sulfur-containing compounds in the flue dust, wherein dry slaked lime is used as an absorbent, and the flue gas in the desulfurization tower 2 is reacted with dry slaked lime, thereby removing sulfur-containing compounds in the flue gas; or, The semi-dry desulfurization method is used to remove the sulfur compounds in the flue dust. Wherein, the hydrated lime slurry is sprayed in the desulfurization tower 2, so that the hydrated lime slurry is evenly distributed in the desulfurization tower 2, and the flue gas reacts with the hydrated lime in the desulfurization tower 2, thereby removing sulfur compounds in the flue gas.
在一些实施例中,低温吸附塔4内设置有活性炭,可以理解的是,活性炭对烟气中的含硫化合物和氧气的反应具有催化作用,并且活性炭的表面上具有微孔,能够吸附含硫化合物和氧气的反应后的产物,进而达到脱硫的效果。此外,活性炭的对烟气中的NO进行催化还原反应,在还原剂NH3的作用下将NO还原为N2,进而达到脱硝和脱氨的目的。In some embodiments, the low-temperature adsorption tower 4 is provided with activated carbon. It can be understood that the activated carbon has a catalytic effect on the reaction of sulfur-containing compounds and oxygen in the flue gas, and the surface of the activated carbon has micropores, which can absorb sulfur-containing The product of the reaction between the compound and oxygen, and then achieve the effect of desulfurization. In addition, activated carbon can perform catalytic reduction reaction on NO in the flue gas, and reduce NO to N2 under the action of reducing agent NH3, so as to achieve the purpose of denitrification and deamination.
在一些实施例中,如图2所示,本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统还包括除尘器5,除尘器5包括进气口51和出气口52,进气口51与第二烟气出口22连通,以便将烟气通入除尘器5,出气口52与第三烟气进口321连通,以使第二烟气出口22与第三烟气进口321连通。In some embodiments, as shown in Figure 2, the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application further includes a dust collector 5, and the dust collector 5 includes an air inlet 51 and an air outlet 52, and the air inlet 51 communicates with the second flue gas outlet 22 so as to pass the flue gas into the dust collector 5 , and the gas outlet 52 communicates with the third flue gas inlet 321 so that the second flue gas outlet 22 communicates with the third flue gas inlet 321 .
具体地,经过脱硫塔2处理后的烟气从第二烟气出口22排出,通过进气口51进入除尘器5中,除尘器5对烟气进行除尘处理,其中除尘器5能够除去烟气中的烟尘和活性焦,经过除尘后的烟气从除尘器5的出气口52排出。Specifically, the flue gas treated by the desulfurization tower 2 is discharged from the second flue gas outlet 22, and enters the dust collector 5 through the air inlet 51, and the dust collector 5 performs dust removal treatment on the flue gas, wherein the dust collector 5 can remove the flue gas The soot and active coke in the dust and the flue gas after dedusting are discharged from the gas outlet 52 of the dust collector 5 .
此外,除尘器5还包括出尘口53,其中从烟气中去除的烟尘和活性焦从除尘器5的出尘口53排出,进而避免除尘器5残留的烟尘和活性焦对烟气造成二次污染。In addition, the dust collector 5 also includes a dust outlet 53, wherein the dust and active coke removed from the flue gas are discharged from the dust outlet 53 of the dust collector 5, thereby preventing the dust and active coke remaining in the dust collector 5 from causing secondary damage to the flue gas. secondary pollution.
在一些实施例中,如图2所示,本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统还包括回冷器6,回冷器6包括第五烟气进口611和第五烟气出口612,第五烟气进口611与出气口52连通,以便将烟气通入回冷器6内,从而降低烟气的温度,第五烟气出口612与第三烟气进口321连通,以使出气口52与第三烟气进口321连通。In some embodiments, as shown in Figure 2, the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application further includes a recooler 6, and the recooler 6 includes a fifth flue gas inlet 611 and a fifth flue gas inlet 611. The gas outlet 612, the fifth flue gas inlet 611 communicates with the gas outlet 52, so as to pass the flue gas into the recooler 6, thereby reducing the temperature of the flue gas, the fifth flue gas outlet 612 communicates with the third flue gas inlet 321, Such that the gas outlet 52 communicates with the third flue gas inlet 321 .
具体地,经过除尘器5处理后的烟尘通过出气口52排出,经过第五烟气进口611进入回冷器6中,回冷器6对烟气进行降温处理,经过降温的烟气从回冷器6的第五烟气出口612排出,通过第三烟气进口321进入蒸发器32中,进而将烟气进行再次降温。Specifically, the dust treated by the dust collector 5 is discharged through the gas outlet 52, enters the recooler 6 through the fifth flue gas inlet 611, and the recooler 6 cools the flue gas, and the cooled flue gas is cooled from the recooler The fifth flue gas outlet 612 of the device 6 is discharged into the evaporator 32 through the third flue gas inlet 321, and then the flue gas is cooled again.
在一些实施例中,回冷器6还包括第七烟气进口621和第七烟气出口622,第七烟气进口621与第四烟气出口42连通,以便将烟气通入回冷器6内,从而对回冷器6进行冷却。具体地,经过低温吸附塔4处理后的烟气从第四烟气出口42排出,通过第七烟气进口621进入回冷器6。进一步地,烟气从回冷器6第七烟气出口622排出。In some embodiments, the recooler 6 further includes a seventh flue gas inlet 621 and a seventh flue gas outlet 622, the seventh flue gas inlet 621 communicates with the fourth flue gas outlet 42, so that the flue gas can be passed into the recooler 6, so as to cool the recooler 6. Specifically, the flue gas treated by the low-temperature adsorption tower 4 is discharged from the fourth flue gas outlet 42 and enters the recooler 6 through the seventh flue gas inlet 621 . Further, the flue gas is discharged from the seventh flue gas outlet 622 of the recooler 6 .
进一步地,回冷器6包括第一换热组件61和第二换热组件62,第一换热组件61能够和第二换热组件62换热,第一换热组件61包括第五烟气进口611和第五烟气出口612。第二换热组件62包括第七烟气进口621和第七烟气出口622。Further, the recooler 6 includes a first heat exchange assembly 61 and a second heat exchange assembly 62, the first heat exchange assembly 61 can exchange heat with the second heat exchange assembly 62, and the first heat exchange assembly 61 includes the fifth flue gas Inlet 611 and fifth flue gas outlet 612. The second heat exchange component 62 includes a seventh flue gas inlet 621 and a seventh flue gas outlet 622 .
具体地,如图2所示,经过除尘器5处理后的烟气从第五烟气进口611进入第一换热组件61,从低温吸附塔4排出的烟气经第七烟气进口621进入第二换热组件62,第一换热组件61中的烟气通过第一换热组件61与第二换热组件62的烟气进行换热,进而降低第一换热组件61内烟气的温度。Specifically, as shown in Figure 2, the flue gas treated by the dust collector 5 enters the first heat exchange assembly 61 from the fifth flue gas inlet 611, and the flue gas discharged from the cryogenic adsorption tower 4 enters through the seventh flue gas inlet 621. The second heat exchanging component 62, the flue gas in the first heat exchanging component 61 exchanges heat with the flue gas in the second heat exchanging component 62 through the first heat exchanging component 61, thereby reducing the temperature.
可以理解的是,从低温吸附塔4排出的烟气经过回冷器6降温,且在回冷器6降温后又通过蒸发器32进行再次降温,因此,从低温吸附塔4排出烟气的温度低于第一换热组件61中的烟气的温度,即第二换热组件62中的烟气的温度低于第一换热组件61中的烟气的温度,因此第二换热组件62能够降低第一换热组件61中烟气的温度。It can be understood that the flue gas discharged from the low-temperature adsorption tower 4 is cooled through the recooler 6, and after the recooler 6 is cooled, the temperature is lowered again by the evaporator 32. Therefore, the temperature of the flue gas discharged from the low-temperature adsorption tower 4 lower than the temperature of the flue gas in the first heat exchange assembly 61, that is, the temperature of the flue gas in the second heat exchange assembly 62 is lower than the temperature of the flue gas in the first heat exchange assembly 61, so the second heat exchange assembly 62 The temperature of the flue gas in the first heat exchange component 61 can be reduced.
在一些实施例中,如图2所示,本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统还包括水冷器7,水冷器7包括第六烟气进口711和第六烟气出口712,第六烟气进口711与出气口52连通,以便将烟气通入水冷器7内,从而降低烟气的温度,第六烟气出口712与第五烟气进口611连通,以使出气口52与第五烟气进口611连通。In some embodiments, as shown in FIG. 2 , the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application further includes a water cooler 7, and the water cooler 7 includes a sixth flue gas inlet 711 and a sixth flue gas outlet 712, the sixth flue gas inlet 711 communicates with the gas outlet 52, so as to pass the flue gas into the water cooler 7, thereby reducing the temperature of the flue gas, and the sixth flue gas outlet 712 communicates with the fifth flue gas inlet 611, so that the The gas port 52 communicates with the fifth flue gas inlet 611 .
具体地,经过除尘器5处理后的烟尘通过排气口排出,经过第六烟气进口711进入水冷器7,进一步地,水冷器7对烟气进行降温处理。经过降温的烟气从第六烟气出口712排出,通过第五烟气进口611进入回冷器6中。Specifically, the dust treated by the dust collector 5 is discharged through the exhaust port, and enters the water cooler 7 through the sixth flue gas inlet 711, and further, the water cooler 7 performs cooling treatment on the flue gas. The cooled flue gas is discharged from the sixth flue gas outlet 712 and enters the recooler 6 through the fifth flue gas inlet 611 .
进一步地,水冷器7还包括第三进水口721和第三出水口722,第三进水口721用于向水冷器7通入冷却水,以便对水冷器7进行冷却。具体地,冷却水从第三进水口721进入水冷器7中与水冷器7的烟气进行换热,进而降低烟气的温度。与烟气进行过换热的冷却水从第三出水口722排出。Further, the water cooler 7 further includes a third water inlet 721 and a third water outlet 722 , the third water inlet 721 is used to feed cooling water into the water cooler 7 so as to cool the water cooler 7 . Specifically, the cooling water enters the water cooler 7 from the third water inlet 721 to exchange heat with the flue gas of the water cooler 7, thereby reducing the temperature of the flue gas. The cooling water that has exchanged heat with the flue gas is discharged from the third water outlet 722 .
进一步地,水冷器7包括第三换热组件71和第四换热组件72,第三换热组件71能够与第四换热组件72换热,第三换热组件71包括第六烟气进口711和第六烟气出口712,第四换热组件72包括第三进水口721和第三出水口722。Further, the water cooler 7 includes a third heat exchange assembly 71 and a fourth heat exchange assembly 72, the third heat exchange assembly 71 can exchange heat with the fourth heat exchange assembly 72, and the third heat exchange assembly 71 includes a sixth flue gas inlet 711 and the sixth flue gas outlet 712 , the fourth heat exchange component 72 includes a third water inlet 721 and a third water outlet 722 .
具体地,经除尘器5处理的烟气从第六烟气进口711进入第三换热组件71中,冷却水从第三进水口721进入第四换热组件72中,进而使烟气能够通过第三换热组件71与第四换热组件72中的冷却水进行换热。经过处理后的烟气从第三换热组件71的第六烟气出口712排出,与烟气换热后的冷却水从第四换热组件72的第三出水口722排出。Specifically, the flue gas treated by the dust collector 5 enters the third heat exchange assembly 71 from the sixth flue gas inlet 711, and the cooling water enters the fourth heat exchange assembly 72 from the third water inlet 721, so that the flue gas can pass through The third heat exchange component 71 exchanges heat with the cooling water in the fourth heat exchange component 72 . The treated flue gas is discharged from the sixth flue gas outlet 712 of the third heat exchange component 71 , and the cooling water after heat exchange with the flue gas is discharged from the third water outlet 722 of the fourth heat exchange component 72 .
在一些实施例中,如图2所示,本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统包括烟筒9和引风机8。In some embodiments, as shown in FIG. 2 , the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application includes a chimney 9 and an induced draft fan 8 .
引风机8包括进风口81和出风口82,引风机8的进风口81与第七烟气出口622连通,引风机8的出风口82与烟筒9连通,从而将烟气排放。The induced fan 8 includes an air inlet 81 and an air outlet 82. The air inlet 81 of the induced fan 8 communicates with the seventh flue gas outlet 622, and the air outlet 82 of the induced fan 8 communicates with the chimney 9 to discharge the flue gas.
具体地,蒸发器32排出的烟气从第七烟气出口622排出进入引风机8中,进一步地,烟气从引风机8的出风口82排出。可以理解的是,引风机8能够本申请实施例的用于焦化厂烟气的低温脱硫脱硝系统中烟气的循环速度。Specifically, the flue gas discharged from the evaporator 32 is discharged from the seventh flue gas outlet 622 into the induced draft fan 8 , further, the flue gas is discharged from the air outlet 82 of the induced draft fan 8 . It can be understood that the induced draft fan 8 can achieve the circulation speed of flue gas in the low-temperature desulfurization and denitrification system for coking plant flue gas in the embodiment of the present application.
在本申请的描述中,需要理解的是,术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系,仅是为了便于描述本申请和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本申请的限制。In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, constructed, and operate in a particular orientation, and thus should not be construed as limiting of the application.
此外,术语“第一”、“第二”仅用于描述目的,而不能理解为指示或暗示相对重要性 或者隐含指明所指示的技术特征的数量。由此,限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本申请的描述中,“多个”的含义是至少两个,例如两个,三个等,除非另有明确具体的限定。In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.
在本申请中,除非另有明确的规定和限定,术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解,例如,可以是固定连接,也可以是可拆卸连接,或成一体;可以是机械连接,也可以是电连接或彼此可通讯;可以是直接相连,也可以通过中间媒介间接相连,可以是两个元件内部的连通或两个元件的相互作用关系,除非另有明确的限定。对于本领域的普通技术人员而言,可以根据具体情况理解上述术语在本申请中的具体含义。In this application, terms such as "installation", "connection", "connection" and "fixation" should be interpreted in a broad sense, for example, it can be a fixed connection or a detachable connection, unless otherwise clearly specified and limited. , or integrated; can be mechanically connected, can also be electrically connected or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediary, can be the internal communication of two components or the interaction relationship between two components, Unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.
在本申请中,除非另有明确的规定和限定,第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触,或第一和第二特征通过中间媒介间接接触。而且,第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方,或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方,或仅仅表示第一特征水平高度小于第二特征。In the present application, unless otherwise clearly specified and limited, 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. Moreover, "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.
在本申请中,术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本申请的至少一个实施例或示例中。在本说明书中,对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且,描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外,在不相互矛盾的情况下,本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。In this application, 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.
尽管上面已经示出和描述了本申请的实施例,可以理解的是,上述实施例是示例性的,不能理解为对本申请的限制,本领域的普通技术人员在本申请的范围内可以对上述实施例进行变化、修改、替换和变型。Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations on the present application, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

  1. 一种用于焦化厂烟气的低温脱硫脱硝系统,其特征在于,包括:A low-temperature desulfurization and denitrification system for coking plant flue gas, characterized in that it includes:
    余热锅炉,所述余热锅炉包括第一烟气进口、第一烟气出口、第一出水口和第一进水口,所述烟气能够通过所述第一烟气进口进入所述余热锅炉内;A waste heat boiler, the waste heat boiler includes a first flue gas inlet, a first flue gas outlet, a first water outlet and a first water inlet, and the flue gas can enter the waste heat boiler through the first flue gas inlet;
    脱硫塔,所述脱硫塔包括第二烟气进口和第二烟气出口,所述第一烟气出口与所述第二烟气进口连通,以便将所述烟气通入所述脱硫塔内,从而对所述烟气进行脱硫;A desulfurization tower, the desulfurization tower includes a second flue gas inlet and a second flue gas outlet, the first flue gas outlet communicates with the second flue gas inlet, so that the flue gas is passed into the desulfurization tower , so as to desulfurize the flue gas;
    吸收式制冷机组,所述吸收式制冷机组包括蒸汽发生器和蒸发器,所述蒸汽发生器包括第二进水口和第二出水口,所述蒸发器包括第三烟气进口和第三烟气出口,所述第一出水口与所述第二进水口连通,以便将所述余热锅炉中的热水通入所述蒸汽发生器内,所述第二烟气出口与所述第三烟气进口连通,以便将所述烟气通入所述蒸发器内,从而降低所述烟气的温度,所述第二出水口与所述第一进水口连通,以便所述蒸汽发生器内的水回流到所述余热锅炉中;An absorption refrigeration unit, the absorption refrigeration unit includes a steam generator and an evaporator, the steam generator includes a second water inlet and a second water outlet, and the evaporator includes a third flue gas inlet and a third flue gas outlet, the first water outlet communicates with the second water inlet so as to pass the hot water in the waste heat boiler into the steam generator, and the second flue gas outlet communicates with the third flue gas The inlet is communicated so that the flue gas is passed into the evaporator, thereby reducing the temperature of the flue gas, and the second water outlet is communicated with the first water inlet so that the water in the steam generator return to said waste heat boiler;
    低温吸附塔,所述低温吸附塔包括第四烟气进口和第四烟气出口,所述第三烟气出口与所述第四烟气进口连通,以便将所述烟气通入所述低温吸附塔内,从而对所述烟气进行脱硫、脱硝。A low-temperature adsorption tower, the low-temperature adsorption tower includes a fourth flue gas inlet and a fourth flue gas outlet, the third flue gas outlet communicates with the fourth flue gas inlet, so that the flue gas is passed into the low-temperature In the adsorption tower, the flue gas is desulfurized and denitrified.
  2. 根据权利要求1所述的用于焦化厂烟气的低温脱硫脱硝系统,其特征在于,还包括除尘器,所述除尘器包括进气口和出气口,所述进气口与所述第二烟气出口连通,以便将所述烟气通入所述除尘器,The low-temperature desulfurization and denitrification system for coking plant flue gas according to claim 1, further comprising a dust collector, the dust collector includes an air inlet and an air outlet, and the air inlet and the second The flue gas outlet is connected so that the flue gas can be passed into the dust collector,
    所述出气口与所述第三烟气进口连通,以使第二烟气出口与所述第三烟气进口连通。The gas outlet communicates with the third flue gas inlet, so that the second flue gas outlet communicates with the third flue gas inlet.
  3. 根据权利要求2所述的用于焦化厂烟气的低温脱硫脱硝系统,其特征在于,还包括回冷器,所述回冷器包括第五烟气进口和第五烟气出口,所述第五烟气进口与所述出气口连通,以便将所述烟气通入所述回冷器内,从而降低所述烟气的温度,The low-temperature desulfurization and denitrification system for coking plant flue gas according to claim 2, further comprising a recooler, the recooler includes a fifth flue gas inlet and a fifth flue gas outlet, and the first 5. The flue gas inlet communicates with the gas outlet so that the flue gas can be passed into the recooler to reduce the temperature of the flue gas,
    所述第五烟气出口与所述第三烟气进口连通,以使所述出气口与所述第三烟气进口连通。The fifth flue gas outlet communicates with the third flue gas inlet, so that the gas outlet communicates with the third flue gas inlet.
  4. 根据权利要求3所述的用于焦化厂烟气的低温脱硫脱硝系统,其特征在于,所述回冷器还包括第七烟气进口和第七烟气出口,所述第七烟气进口与所述第四烟气出口连通,以便将所述烟气通入所述回冷器内,从而对所述回冷器进行冷却。The low-temperature desulfurization and denitrification system for coking plant flue gas according to claim 3, wherein the recooler also includes a seventh flue gas inlet and a seventh flue gas outlet, and the seventh flue gas inlet and The fourth flue gas outlet is communicated so as to pass the flue gas into the recooler so as to cool the recooler.
  5. 根据权利要求4所述的用于焦化厂烟气的低温脱硫脱硝系统,其特征在于,所述回冷器包括第一换热组件和第二换热组件,所述第一换热组件能够和所述第二换热组件换热,所述第一换热组件包括所述第五烟气进口和所述第五烟气出口,所述第二换热组件包括所述第七烟气进口和所述第七烟气出口。The low-temperature desulfurization and denitrification system for coking plant flue gas according to claim 4, wherein the recooler includes a first heat exchange assembly and a second heat exchange assembly, and the first heat exchange assembly can be used with The second heat exchange component exchanges heat, the first heat exchange component includes the fifth flue gas inlet and the fifth flue gas outlet, and the second heat exchange component includes the seventh flue gas inlet and the fifth flue gas outlet. The seventh flue gas outlet.
  6. 根据权利要求5所述的用于焦化厂烟气的低温脱硫脱硝系统,其特征在于,还包括 水冷器,所述水冷器包括第六烟气进口和第六烟气出口,所述第六烟气进口与所述出气口连通,以便将所述烟气通入所述水冷器内,从而降低所述烟气的温度,The low-temperature desulfurization and denitrification system for coking plant flue gas according to claim 5, further comprising a water cooler, the water cooler includes a sixth flue gas inlet and a sixth flue gas outlet, and the sixth flue gas The gas inlet is communicated with the gas outlet, so that the flue gas is passed into the water cooler, thereby reducing the temperature of the flue gas,
    所述第六烟气出口与所述第五烟气进口连通,以使所述出气口与所述第五烟气进口连通。The sixth flue gas outlet communicates with the fifth flue gas inlet, so that the gas outlet communicates with the fifth flue gas inlet.
  7. 根据权利要求6所述的用于焦化厂烟气的低温脱硫脱硝系统,其特征在于,所述水冷器还包括第三进水口和第三出水口,所述第三进水口用于向所述水冷器通入冷却水,以便对所述水冷器进行冷却。The low-temperature desulfurization and denitrification system for coking plant flue gas according to claim 6, wherein the water cooler further includes a third water inlet and a third water outlet, and the third water inlet is used to Cooling water is fed into the water cooler so as to cool the water cooler.
  8. 根据权利要求7所述的用于焦化厂烟气的低温脱硫脱硝系统,其特征在于,所述水冷器包括第三换热组件和第四换热组件,所述第三换热组件能够与所述第四换热组件换热,所述第三换热组件包括所述第六烟气进口和所述第六烟气出口,所述第四换热组件包括所述第三进水口和所述第三出水口。The low-temperature desulfurization and denitrification system for coking plant flue gas according to claim 7, wherein the water cooler includes a third heat exchange component and a fourth heat exchange component, and the third heat exchange component can be connected with the The fourth heat exchange component includes the sixth flue gas inlet and the sixth flue gas outlet, and the fourth heat exchange component includes the third water inlet and the third outlet.
  9. 根据权利要求8所述的用于焦化厂烟气的低温脱硫脱硝系统,其特征在于,还包括:The low-temperature desulfurization and denitrification system for coking plant flue gas according to claim 8, further comprising:
    烟筒,所述烟筒;和chimney, said chimney; and
    引风机,所述引风机包括进风口和出风口,所述引风机的进风口与所述第七烟气出口连通,所述引风机的出风口与所述烟筒连通,从而将所述烟气排放。An induced fan, the induced fan includes an air inlet and an air outlet, the air inlet of the induced fan communicates with the seventh flue gas outlet, and the air outlet of the induced fan communicates with the chimney, so that the flue gas emission.
  10. 根据权利要求1-9中任一项所述的用于焦化厂烟气的低温脱硫脱硝系统,其特征在于,所述脱硫塔内设有用于脱硫的活性焦。The low-temperature desulfurization and denitrification system for coking plant flue gas according to any one of claims 1-9, characterized in that, the desulfurization tower is provided with active coke for desulfurization.
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CN112268293A (en) * 2020-11-11 2021-01-26 西安热工研究院有限公司 Large-scale thermal power generating unit flue gas active coke purification system and method
CN216171293U (en) * 2021-09-28 2022-04-05 中国华能集团清洁能源技术研究院有限公司 Low-temperature desulfurization and denitrification system for flue gas of coking plant

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CN107327863A (en) * 2017-06-06 2017-11-07 李宜立 Suitable for the flue gas purification system and flue gas purifying method of gas turbine
CN112268293A (en) * 2020-11-11 2021-01-26 西安热工研究院有限公司 Large-scale thermal power generating unit flue gas active coke purification system and method
CN216171293U (en) * 2021-09-28 2022-04-05 中国华能集团清洁能源技术研究院有限公司 Low-temperature desulfurization and denitrification system for flue gas of coking plant

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