WO2023050699A1 - Low-temperature desulfurization and denitrification method and system for flue gas from biomass power plant - Google Patents

Low-temperature desulfurization and denitrification method and system for flue gas from biomass power plant Download PDF

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WO2023050699A1
WO2023050699A1 PCT/CN2022/078041 CN2022078041W WO2023050699A1 WO 2023050699 A1 WO2023050699 A1 WO 2023050699A1 CN 2022078041 W CN2022078041 W CN 2022078041W WO 2023050699 A1 WO2023050699 A1 WO 2023050699A1
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flue gas
temperature
low
inlet
denitrification
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PCT/CN2022/078041
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French (fr)
Chinese (zh)
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刘练波
肖平
许世森
李卫东
郜时旺
牛红伟
汪世清
彭虎
徐丹
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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 WO2023050699A1 publication Critical patent/WO2023050699A1/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
    • B01D53/34Chemical 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
    • B01D53/02Separation 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
    • B01D53/501Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
    • 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
    • B01D53/8603Removing sulfur compounds
    • B01D53/8609Sulfur 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
    • B01D53/86Catalytic processes
    • B01D53/8621Removing nitrogen compounds
    • B01D53/8625Nitrogen oxides
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/06Arrangements of devices for treating smoke or fumes of coolers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/40Alkaline earth metal or magnesium compounds
    • B01D2251/404Alkaline earth metal or magnesium compounds of calcium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/60Inorganic bases or salts
    • B01D2251/604Hydroxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2253/00Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10Inorganic adsorbents
    • B01D2253/102Carbon
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases
    • 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
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

  • the present disclosure relates to the technical field of gas purification, in particular to a method and system for low-temperature desulfurization and denitrification of flue gas from biomass power plants.
  • Biomass power plants are boilers fueled by biomass energy. Wastes from the agricultural production process, such as crop stalks and agricultural processing waste, can be used as fuels for biomass power plants. Therefore, compared with coal-fired power plants, Biomass energy has the advantages of renewability, low pollution, and abundant sources of raw materials.
  • the flue gas produced by the biomass boiler contains pollutants such as sulfur dioxide and nitrogen oxides.
  • desulfurization and denitrification are performed on the flue gas produced by biomass power plants under high temperature conditions, but the desulfurization and denitrification efficiencies are low.
  • the present disclosure aims to solve one of the technical problems in the related art at least to a certain extent.
  • the embodiments of the present disclosure propose a low-temperature desulfurization and denitrification method for flue gas from a biomass power plant, which has the advantages of high denitrification rate and high desulfurization rate.
  • Embodiments of the present disclosure also propose a low-temperature desulfurization and denitrification system for flue gas from a biomass power plant, which has the advantages of high denitrification rate and high desulfurization rate.
  • the low-temperature desulfurization and denitrification method for biomass power plant flue gas is characterized in that it includes the following steps: reducing the temperature of the flue gas to 5°C-15°C; performing low-temperature desulfurization on the flue gas; The temperature of the flue gas drops below -10°C; the flue gas is subjected to low-temperature denitrification; and the flue gas is discharged.
  • the low-temperature desulfurization and denitrification method for biomass power plant flue gas in the embodiment of the present disclosure lowers the temperature of the flue gas to 5°C-15°C, and then desulfurizes the flue gas at a temperature of 5°C-15°C.
  • the desulfurization efficiency is high under the low temperature condition of 15° C., so the desulfurization rate of the low-temperature desulfurization and denitrification method used in the flue gas of the biomass power plant according to the embodiment of the present disclosure is increased.
  • the cooled flue gas is cooled again, wherein the temperature of the flue gas is lowered to below -10°C, and then the low-temperature flue gas with a temperature below -10°C is subjected to denitrification treatment, and the flue gas is kept at a low temperature below -10°C
  • the denitrification efficiency is high, so the denitrification rate of the low-temperature desulfurization and denitrification method used in the flue gas of the biomass power plant according to the embodiment of the present disclosure is increased.
  • the low-temperature desulfurization and denitrification method used in the embodiment of the present disclosure for the flue gas of a biomass power plant has the advantages of high denitrification rate and high desulfurization rate.
  • reducing the temperature of the flue gas to 5°C-15°C includes: passing the flue gas into an economizer to reduce the temperature of the flue gas to 120°C-150°C; The flue gas is passed into the refrigeration system to reduce the temperature of the flue gas to 5°C-15°C.
  • the flue gas is passed into the recooler, so that the flue gas The temperature of the gas is lowered to 30°C-60°C; after the low-temperature denitrification of the flue gas, before the discharge of the flue gas, the flue gas is passed into the recooler to The recooler performs cooling.
  • the flue gas is passed into the water cooler, so that the The temperature of the flue gas is lowered to 60°C-90°C; cooling water is passed into the water cooler to cool the water cooler.
  • the flue gas is dedusted.
  • reducing the temperature of the flue gas to below -10°C includes: passing the flue gas into a cryogenic system to reduce the temperature of the flue gas to below -10°C.
  • the low-temperature desulfurization and denitrification system for biomass power plant flue gas includes: a biomass boiler including a flue gas discharge port; a refrigeration system including a first flue gas inlet and a second flue gas inlet A flue gas outlet, the flue gas discharge port communicates with the first flue gas inlet, so as to pass the flue gas into the refrigeration system, thereby reducing the temperature of the flue gas to 5°C-15°C; the first low temperature An adsorption tower, the first low-temperature adsorption tower includes a second flue gas inlet and a second flue gas outlet, and the first flue gas outlet communicates with the second flue gas inlet so that the flue gas can be passed into the In the first cryogenic adsorption tower, so that the flue gas is desulfurized; the cryogenic system, the cryogenic system includes a third flue gas inlet and a third flue gas outlet, and the second flue gas outlet is connected to the third flue gas
  • the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure cools the flue gas through a refrigeration system, and reduces the temperature of the flue gas to 5°C-15°C, low temperature (temperature between 5°C-15°C)
  • the flue gas is desulfurized in the first low-temperature adsorption tower, and the desulfurization efficiency of the flue gas is high at a low temperature of 5°C-15°C, so the desulfurization of the low-temperature desulfurization and denitrification system used in the flue gas of a biomass power plant according to the embodiment of the present disclosure is increased. Rate.
  • the flue gas desulfurized by the first low-temperature adsorption tower is cooled again through the cryogenic system, and the temperature of the flue gas is lowered to below -10°C.
  • the denitration treatment is carried out in the low-temperature adsorption tower, and the denitrification efficiency of the flue gas is high at a low temperature below -10°C, so the denitrification rate of the low-temperature desulfurization and denitrification system for flue gas of a biomass power plant in the embodiment of the present disclosure is increased.
  • the low-temperature desulfurization and denitrification system used in the embodiment of the present disclosure for biomass power plant flue gas has the advantages of high denitrification rate and high desulfurization rate.
  • the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiments of the present disclosure further includes an economizer, the economizer includes a fifth flue gas inlet and a fifth flue gas outlet, and the flue gas The discharge port communicates with the fifth flue gas inlet, so that the flue gas can be passed into the economizer, thereby reducing the temperature of the flue gas to 120°C-150°C,
  • the fifth smoke outlet communicates with the first smoke inlet, so that the smoke discharge port communicates with the first smoke inlet.
  • the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiments of the present disclosure further includes a water cooler, the water cooler includes a sixth flue gas inlet and a sixth flue gas outlet, and the fifth flue gas
  • the gas outlet is connected with the sixth flue gas inlet so that the flue gas can be passed into the water cooler, thereby reducing the temperature of the flue gas to 60°C-90°C
  • the sixth flue gas outlet is connected with the The first flue gas inlet is communicated so that the fifth flue gas outlet communicates with the first flue gas inlet.
  • the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure further includes a recooler, the recooler includes a seventh flue gas inlet and a seventh flue gas outlet, and the sixth The flue gas outlet communicates with the seventh flue gas inlet so that the flue gas can be passed into the recooler so that the temperature of the flue gas can be reduced to 30°C-60°C, and the seventh flue gas The outlet communicates with the first flue gas inlet, so that the sixth flue gas outlet communicates with the first flue gas inlet.
  • Fig. 1 is a schematic structural diagram of a low-temperature desulfurization and denitrification system for flue gas from a biomass power plant according to an embodiment of the present disclosure.
  • Fig. 2 is a schematic structural diagram of a low-temperature desulfurization and denitrification system for biomass power plant flue gas according to an embodiment of the present disclosure.
  • Biomass boiler 1 Flue gas discharge port 11;
  • Refrigeration system 2 first flue gas inlet 21; first flue gas outlet 22;
  • Cryogenic system 4 third flue gas inlet 41; third flue gas outlet 42;
  • Economizer 7 fifth flue gas inlet 71; fifth flue gas outlet 72;
  • Recooler 9 seventh flue gas inlet 91; seventh flue gas outlet 92; low temperature flue gas pipeline 93; eighth flue gas inlet 931; eighth flue gas outlet 932;
  • Dust collector 10 air inlet 101; air outlet 102; dust outlet 103;
  • Induced fan 20 air inlet 201; air outlet 202.
  • the desulfurization efficiency of the related technology is generally up to 70%.
  • the desulfurization agent is limestone, which decomposes into calcium oxide and carbon dioxide at high temperature, and the SO2 in the flue gas undergoes a chemical reaction to be removed.
  • the efficiency of desulfurization by calcium spraying in the furnace by this method is about 60%-65%, so the desulfurization efficiency is low.
  • the related technology is to spray NH 3 , urea and other reducing agents into the boiler furnace for selective reaction with NO x , no catalyst is needed, and the reducing agent must be added under high temperature conditions.
  • the reducing agent is thermally decomposed into NH 3 , which reacts with the NO x NO x reacts to generate N 2 and water, and then denitrates the flue gas.
  • the denitrification efficiency of related technologies is generally 30%-80%, which is greatly affected by the furnace temperature of the boiler.
  • the denitrification efficiency of the related technology can reach 60% above 850°C and reaches the maximum at 900°C, so the denitrification efficiency is low.
  • the low-temperature desulfurization and denitrification system for biomass power plant flue gas includes a biomass boiler 1, a refrigeration system 2, a first low-temperature adsorption tower 3, a cryogenic system 4, a second Two cryogenic adsorption towers 5 and chimneys 6.
  • the biomass boiler 1 includes a flue gas discharge port 11 , specifically, the biomass fuel is sent to the biomass boiler 1 for incineration, and the flue gas generated by incineration is discharged from the flue gas discharge port 11 .
  • the refrigeration system 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 refrigeration system 2, thereby reducing the temperature of the flue gas. to 5°C-15°C.
  • the first low-temperature adsorption tower 3 comprises a second flue gas inlet 31 and a second flue gas outlet 32, and the first flue gas outlet 22 communicates with the second flue gas inlet 31, so that flue gas is passed into the first low-temperature adsorption tower 3, To desulfurize the flue gas.
  • the flue gas that has been cooled down enters the first low-temperature adsorption tower 3 from the second flue gas inlet 31, and the flue gas is desulfurized in the first low-temperature adsorption tower 3, and after the first low-temperature adsorption
  • the flue gas desulfurized by the tower 3 is discharged from the first cryogenic adsorption tower 3 through the second flue gas outlet 32 .
  • the height of the tower body of the first cryogenic adsorption tower 3 is large, so that the flue gas in the first cryogenic adsorption tower 3 can fully react in the first cryogenic adsorption tower 3, so the increase in the embodiment of the present disclosure
  • the desulfurization rate of the low-temperature desulfurization and denitrification system used for biomass power plant flue gas is increased.
  • the first low-temperature adsorption tower 3 is equipped with activated carbon for desulfurization.
  • 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 compounds and oxygen.
  • the product after the reaction can achieve the effect of desulfurization.
  • the cryogenic system 4 includes a third flue gas inlet 41 and a third flue gas outlet 42, the second flue gas outlet 32 communicates with the third flue gas inlet 41, so that the flue gas is passed into the cryogenic system 4, thereby the flue gas The temperature drops below -10°C.
  • the flue gas that has undergone desulfurization treatment enters the cryogenic system 4 from the third flue gas inlet 41, and the flue gas is subjected to cooling treatment again in the cryogenic system 4, wherein the flue gas after the cooling treatment The temperature is below -10°C, and the cooled flue gas is discharged from the cryogenic system 4 through the third flue gas outlet 42 .
  • the second low-temperature adsorption tower 5 includes a fourth flue gas inlet 51 and a fourth flue gas outlet 52, and the third flue gas outlet 42 communicates with the fourth flue gas inlet 51, so that flue gas is passed into the second low-temperature adsorption tower 5, To denitrify the flue gas.
  • the flue gas cooled by the cryogenic system 4 enters the second cryogenic adsorption tower 5 from the fourth flue gas inlet 51 , and the flue gas is denitrated in the second cryogenic adsorption tower 5 .
  • the denitrified flue gas exits the second cryogenic adsorption tower 5 from the fourth flue gas outlet 52 .
  • the second cryogenic adsorption tower 5 is provided with activated coke, and the surface of the activated coke has micropores capable of adsorbing nitrogen oxides in sulfur-containing flue gas.
  • activated coke can produce a catalytic reduction reaction for NO in flue gas, and reduce NO to N 2 under the action of reducing agent NH 3 , thereby achieving the purpose of denitrification and deammonization.
  • the inlet 61 of the chimney 6 communicates with the fourth flue gas outlet 52 to discharge the flue gas.
  • the flue gas after denitration treatment by the second low temperature adsorption tower 5 enters the chimney 6 through the inlet 61 of the chimney 6 , and the flue gas is discharged to the outside from the outlet 62 of the chimney 6 .
  • the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure cools the flue gas through the refrigeration system 2, and reduces the temperature of the flue gas to 5°C-15°C. )
  • the flue gas is desulfurized in the first low-temperature adsorption tower 3, and the flue gas has a high desulfurization efficiency at a low temperature of 5° C. to 15° C. Therefore, the low-temperature desulfurization and denitrification system used in the flue gas of a biomass power plant in this disclosed embodiment is increased. desulfurization rate.
  • the flue gas desulfurized by the first low-temperature adsorption tower 3 is cooled again by the cryogenic system 4, and the temperature of the flue gas is lowered to below -10°C, and the cooled low-temperature flue gas (temperature below -10°C) is
  • the denitration treatment is carried out in the second low-temperature adsorption tower 5, and the denitrification efficiency of the flue gas is high at a low temperature below -10°C, so the denitrification rate of the low-temperature desulfurization and denitrification system used in the flue gas of a biomass power plant according to the embodiment of the present disclosure is increased.
  • the low-temperature desulfurization and denitrification system used in the embodiment of the present disclosure for biomass power plant flue gas has the advantages of high denitrification rate and high desulfurization rate.
  • slaked lime may be provided in the first low-temperature adsorption tower 3. It can be understood that the first low-temperature adsorption tower 3 reacts with the flue gas to desulfurize the flue gas. Therefore, the first low-temperature adsorption tower 3 can remove sulfur compounds in flue gas. Wherein, the desulfurization treatment of the flue gas by the first low-temperature adsorption tower 3 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 first cryogenic adsorption tower 3 is reacted with dry slaked lime to remove sulfur-containing compounds in the flue gas. sulfur compounds.
  • semi-dry desulfurization is used to remove sulfur compounds in the flue dust.
  • the hydrated lime slurry is sprayed in the first low-temperature adsorption tower 3, so that the hydrated lime slurry is evenly distributed in the first low-temperature adsorption tower 3, so that the flue gas and the hydrated lime in the first low-temperature adsorption tower 3 reaction, and then remove sulfur compounds in the flue gas.
  • the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure further includes an economizer 7 .
  • the economizer 7 includes a fifth flue gas inlet 71 and a fifth flue gas outlet 72, and the flue gas discharge port 11 communicates with the fifth flue gas inlet 71, so that the flue gas is passed into the economizer 7, so that the flue gas
  • the fifth flue gas outlet 72 communicates with the first flue gas inlet 21 , so that the flue gas discharge port 11 communicates with the first flue gas inlet 21 .
  • the flue gas discharged from the biomass boiler 1 is discharged through the flue gas discharge port 11, enters the economizer 7 through the fifth flue gas outlet 72, and the flue gas is cooled in the economizer 7 to reduce the temperature to 120°C-150°C, the cooled flue gas exits the economizer 7 through the fifth flue gas outlet 72, and enters the refrigeration system 2 through the first flue gas inlet 21.
  • the temperature reduction treatment of the flue gas in the economizer 7 is through the heat exchange between the economizer 7 and the flue gas, and then the economizer 7 absorbs part of the heat of the flue gas, thereby reducing the temperature of the flue gas. And the economizer 7 absorbs the heat of high-temperature flue gas to heat the refrigerant in the economizer 7, and the heat of the heated refrigerant can provide energy for other devices, and then reuse the absorbed heat, thus improving energy efficiency. utilization rate.
  • the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure further includes a water cooler 8 .
  • the water cooler 8 includes a sixth flue gas inlet 81 and a sixth flue gas outlet 82, the fifth flue gas outlet 72 communicates with the sixth flue gas inlet 81, so that the flue gas is passed into the water cooler 8, so that the temperature of the flue gas down to 60°C-90°C, the sixth flue gas outlet 82 communicates with the first flue gas inlet 21, so that the fifth flue gas outlet 72 communicates with the first flue gas inlet 21, that is to say, the water cooler 8 is set in the provincial Between the coal burner 7 and the refrigeration system 2.
  • the flue gas cooled by the economizer 7 is discharged from the fifth flue gas outlet 72 and enters the water cooler 8 through the sixth flue gas inlet 81 .
  • the temperature of the flue gas is lowered in the water cooler 8, wherein the temperature of the flue gas after cooling by the water cooler 8 is between 60°C and 90°C.
  • the flue gas cooled by the water cooler 8 is discharged from the sixth flue gas outlet 82 and enters the refrigeration system 2 through the first flue gas inlet 21 , so the fifth flue gas outlet 72 communicates with the first flue gas inlet 21 .
  • the flue gas that has been cooled by the economizer 7 is passed into the water cooler 8 for further cooling, so that the temperature of the flue gas is reduced to 60°C-90°C, and then the flue gas is passed into the refrigeration system 2 , reducing the load on the refrigeration system 2, thus increasing the service life of the refrigeration system 2.
  • the water cooler 8 also includes a cooling water pipe, which is used to feed cooling water to exchange heat with the flue gas, thereby reducing the temperature of the flue gas to 60°C-90°C.
  • the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure further includes a dust collector 10.
  • the dust collector 10 includes an air inlet 101 and an air outlet 102.
  • the air inlet 101 communicates with the fifth flue gas outlet 72 so as to pass the flue gas into the dust collector 10
  • the gas outlet 102 communicates with the sixth flue gas inlet 81 so that the fifth flue gas outlet 72 communicates with the sixth flue gas inlet 81 .
  • the flue gas processed by the economizer 7 is discharged from the fifth flue gas outlet 72, and enters the dust collector 10 through the air inlet 101, and the dust collector 10 performs dust removal treatment on the flue gas, wherein the dust collector 10 can remove smoke
  • the flue gas in the air is discharged from the gas outlet 102 of the dust collector 10 after dust removal.
  • the dust collector 10 also includes a dust outlet 103 , and the dust removed from the flue gas is discharged from the dust outlet 103 of the dust collector 10 , so as to prevent secondary pollution of the flue gas by the dust remaining in the dust collector 10 .
  • the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure further includes an induced draft fan 20, and the induced draft fan 20 is arranged between the water cooler 8 and the dust collector 10, and the induced draft fan 20
  • the air inlet 201 of the fan communicates with the air outlet 102
  • the air outlet 202 of the induced draft fan communicates with the sixth flue gas inlet 81 , so that the sixth flue gas inlet 81 communicates with the air outlet 202 .
  • the flue gas discharged from the dust collector 10 enters the induced draft fan 20 from the air inlet, and is discharged from the air outlet 202 of the induced draft fan 20 .
  • the induced draft fan 20 has rotatable fan blades, and the fan blades rotate to increase the flow velocity of the flue gas. Therefore, the induced draft fan 20 can accelerate the flow rate of the flue gas in the low-temperature desulfurization and denitrification system for the flue gas of a biomass power plant according to the embodiment of the present disclosure. cycle speed.
  • the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure further includes a recooler 9 .
  • the recooler 9 includes a seventh flue gas inlet 91 and a seventh flue gas outlet 92, and the sixth flue gas outlet 82 communicates with the seventh flue gas inlet 91 so as to pass the flue gas into the recooler 9, so that the flue gas
  • the seventh flue gas outlet 92 communicates with the first flue gas inlet 21, so that the sixth flue gas outlet 82 communicates with the first flue gas inlet 21.
  • the flue gas cooled by the water cooler 8 enters the recooler 9 from the seventh flue gas inlet 91, and the flue gas is cooled in the recooler 9, wherein the recooler 9 reduces the temperature of the flue gas to 30°C-60°C, the flue gas cooled by the recooler 9 is discharged from the seventh flue gas outlet 92, and then enters the refrigeration system 2 through the first flue gas inlet 21.
  • the flue gas that has been cooled by the water cooler 8 is passed into the recooler 9 for further cooling, so that the temperature of the flue gas is reduced to 30°C-60°C, and then the flue gas is passed into the refrigeration system 2 , thereby reducing the load on the refrigeration system 2, thus increasing the service life of the refrigeration system 2.
  • the recooler 9 includes a low-temperature flue gas pipeline 93
  • the low-temperature flue gas pipeline 93 includes an eighth flue gas inlet 931 and an eighth flue gas outlet 932
  • the fourth flue gas outlet 52 communicates with the eighth flue gas inlet 931, so that The flue gas is passed into the low-temperature flue gas pipeline 93 to cool the recooler 9 .
  • the flue gas after denitrification treatment in the second low-temperature adsorption tower 5 is discharged from the fourth flue gas outlet 52, and enters the recooler 9 through the eighth flue gas inlet 931 of the low-temperature flue gas pipeline 93, and the low-temperature flue gas pipeline
  • the low-temperature flue gas in 93 exchanges heat with the flue gas in the recooler 9 (the flue gas cooled by the water cooler 8, the temperature of the flue gas is 60°C-90°C), and then the flue gas in the recooler 9 The temperature drops to 30°C-60°C.
  • the temperature of the flue gas in the low-temperature flue gas pipeline 93 is lower than the temperature of the flue gas in the recooler 9. It can be understood that the flue gas in the low-temperature flue gas pipeline 93 has undergone cooling treatment in the cryogenic system 4, so the low-temperature flue gas The temperature of the gas is below -10°C, and the temperature of the flue gas passing from the water cooler 8 to the recooler 9 is 60°C-90°C.
  • cryogenic system 4 consumes energy when cooling the flue gas.
  • the low-temperature flue gas (temperature below -10°C) treated by the second cryogenic adsorption tower 5 is used to cool the flue gas in the recooler 9 ( The temperature is 60° C.-90° C.) for cooling, which fully utilizes the energy consumed when the flue gas of the cryogenic system 4 cools down, thus improving the utilization rate of energy.
  • the eighth flue gas outlet 932 communicates with the inlet 61 of the chimney 6 , so that the inlet 61 of the chimney 6 communicates with the fourth flue gas outlet 52 to discharge the flue gas.
  • the low-temperature flue gas in the low-temperature flue gas pipe 93 is discharged from the eighth flue gas outlet 932 after heat exchange, enters the chimney 6 from the inlet 61 of the chimney 6, and is discharged to the outside through the outlet.
  • the low-temperature desulfurization and denitrification method for biomass power plant flue gas according to the embodiments of the present disclosure will be described below with reference to the accompanying drawings.
  • the low-temperature desulfurization and denitrification method for biomass power plant flue gas in the embodiment of the present disclosure utilizes the above-mentioned low-temperature desulfurization and denitrification system for biomass power plant flue gas.
  • the low-temperature desulfurization and denitrification method for flue gas of a biomass power plant includes the following steps: reducing the temperature of the flue gas to 5°C-15°C; performing low-temperature desulfurization of the flue gas; reducing the temperature of the flue gas to Below -10°C; conduct low-temperature denitrification of the flue gas; discharge the flue gas.
  • the low-temperature desulfurization and denitrification method for biomass power plant flue gas in the embodiment of the present disclosure lowers the temperature of the flue gas to 5°C-15°C, and then desulfurizes the flue gas at a temperature of 5°C-15°C.
  • the desulfurization efficiency is high under the low temperature condition of 15° C., so the desulfurization rate of the low-temperature desulfurization and denitrification method used in the flue gas of the biomass power plant according to the embodiment of the present disclosure is increased.
  • the cooled flue gas is cooled again, wherein the temperature of the flue gas is lowered to below -10°C, and then the low-temperature flue gas with a temperature below -10°C is subjected to denitrification treatment, and the flue gas is kept at a low temperature below -10°C
  • the denitrification efficiency is high, so the denitrification rate of the low-temperature desulfurization and denitrification method used in the flue gas of the biomass power plant according to the embodiment of the present disclosure is increased.
  • the low-temperature desulfurization and denitrification method used in the embodiment of the present disclosure for the flue gas of a biomass power plant has the advantages of high denitrification rate and high desulfurization rate.
  • reducing the temperature of the flue gas to 5°C-15°C includes: passing the flue gas into the economizer 7 to reduce the temperature of the flue gas to 120°C-150°C.
  • the flue gas discharged from the biomass boiler 1 enters the economizer 7 through the fifth flue gas outlet 72, and the flue gas is subjected to cooling treatment in the economizer 7 to reduce the temperature to 120°C-150°C.
  • the flue gas cooled by the economizer 7 is discharged from the economizer 7 through the fifth flue gas outlet 72, and enters the refrigeration system 2 through the first flue gas inlet 21, and the flue gas is cooled in the refrigeration system 2, Lower the temperature to 5°C-15°C.
  • the flue gas is passed into the recooler 9 to reduce the temperature of the flue gas to 30°C-60°C °C.
  • the flue gas cooled by the economizer 7 enters the recooler 9 from the seventh flue gas inlet 91, and the flue gas is cooled in the recooler 9, wherein the recooler 9 lowers the temperature of the flue gas to to 30°C-60°C.
  • the flue gas cooled by the recooler 9 is discharged from the seventh flue gas outlet 92 , and enters the refrigeration system 2 through the first flue gas inlet 21 .
  • the flue gas discharged from the economizer 7 is cooled in the recooler 9 to make the temperature of the flue gas reach 30°C-60°C, and then the temperature of the flue gas is reduced to 5°C-15°C by the refrigeration system 2. °C, thereby avoiding the use of a single device to directly reduce the flue gas temperature to 5 °C -15 °C, thereby increasing the load on the equipment, thus improving the service life of the equipment.
  • the flue gas is passed into the recooler 9 to cool the recooler 9 .
  • the flue gas after denitrification treatment in the second low-temperature adsorption tower 5 is discharged from the fourth flue gas outlet 52, and enters the recooler 9 through the eighth flue gas inlet 931 of the low-temperature flue gas pipeline 93, and the low-temperature flue gas pipeline
  • the low-temperature flue gas in 93 exchanges heat with the flue gas in the recooler 9, thereby reducing the temperature of the flue gas in the recooler 9 to 30°C-60°C, and then cooling the recooler 9.
  • the flue gas cooled by the recooler 9 enters the refrigeration system 2 through the first flue gas inlet 21, and the refrigeration system 2 performs cooling treatment on the flue gas, wherein the temperature of the flue gas after cooling treatment is 5°C-15°C.
  • the cooled flue gas exits the refrigeration system 2 from the first flue gas outlet 22 .
  • the flue gas that has been cooled by the refrigeration system 2 enters the first low-temperature adsorption tower 3 from the second flue gas inlet 31 , and the flue gas is desulfurized in the first low-temperature adsorption tower 3 .
  • the flue gas desulfurized by the first low-temperature adsorption tower 3 is discharged from the first low-temperature adsorption tower 3 through the second flue gas outlet 32 .
  • the flue gas desulfurized by the first low-temperature adsorption tower 3 enters the cryogenic system 4 from the third flue gas inlet 41, and the flue gas is cooled again in the cryogenic system 4, wherein the temperature of the flue gas after the cooling process is Below -10°C.
  • the cooled flue gas exits the cryogenic system 4 from the third flue gas outlet 42 .
  • the flue gas cooled by the cryogenic system 4 enters the second cryogenic adsorption tower 5 from the fourth flue gas inlet 51 , and the flue gas is denitrated in the second cryogenic adsorption tower 5 .
  • the flue gas treated by denitrification is discharged from the second low-temperature adsorption tower 5 from the fourth flue gas outlet 52.
  • the flue gas after the denitration treatment in the second low-temperature adsorption tower 5 enters the chimney 6 through the inlet 61 of the chimney 6 , and the flue gas is discharged to the outside from the outlet 62 of the chimney 6 .
  • the flue gas is passed into the water cooler 8 to reduce the temperature of the flue gas to 60°C-90°C. °C.
  • the flue gas cooled by the economizer 7 is discharged from the fifth flue gas outlet 72 and enters the water cooler 8 through the sixth flue gas inlet 81 .
  • the temperature of the flue gas is lowered in the water cooler 8, wherein the temperature of the flue gas after cooling by the water cooler 8 is between 60°C and 90°C.
  • the flue gas cooled by the water cooler 8 is discharged from the sixth flue gas outlet 82 and enters the recooler 9 through the seventh flue gas inlet 91 .
  • Cooling water is passed into the water cooler 8 to cool the water cooler 8 .
  • the cooling water is passed into the cooling water pipe 83, and the cooling water passes through the cooling water pipe 83 to exchange heat with the flue gas in the water cooler 8, thereby reducing the temperature of the flue gas in the water cooler 8 to 60°C -90°C.
  • the flue gas is dedusted.
  • the flue gas processed by the economizer 7 is discharged from the fifth flue gas outlet 72, and enters the dust collector 10 through the air inlet 101, and the dust collector 10 performs dust removal treatment on the flue gas, wherein the dust collector 10 can remove smoke The smoke and dust in the air, the dust-cleaned flue gas is discharged from the gas outlet 102 of the dust collector 10 , and enters the water cooler 8 from the sixth flue gas inlet 81 . The dust removed from the flue gas is discharged from the dust outlet 103 of the dust collector 10 .
  • reducing the temperature of the flue gas to below -10°C includes: passing the flue gas into the cryogenic system 4 to reduce the temperature of the flue gas to below -10°C.
  • the desulfurized flue gas enters the cryogenic system 4 from the third flue gas inlet 41, and further, the flue gas is subjected to cooling treatment again in the cryogenic system 4, wherein the temperature of the flue gas after the cooling treatment is Below -10°C.
  • the cooled flue gas exits the cryogenic system 4 from the third flue gas outlet 42 .
  • the denitrification efficiency of flue gas is high under low temperature conditions below -10°C, and the temperature of flue gas is lowered to below -10°C, and then the low temperature flue gas with temperature below -10°C is desulfurized, thereby increasing
  • the denitrification rate of the low-temperature desulfurization and denitrification method used in the embodiment of the present disclosure for biomass power plant flue gas is increased.
  • 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 a specific feature, structure, material, or feature described in connection with the embodiment or example. Features are included in at least one embodiment or example of the present disclosure. 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

A low-temperature desulfurization and denitrification method and system for flue gas from a biomass power plant. The low-temperature desulfurization and denitrification method for flue gas from a biomass power plant comprises the following steps: reducing the temperature of flue gas to 5ºC-15ºC; subjecting the flue gas to low-temperature desulfurization; reducing the temperature of the flue gas to -10ºC or below; subjecting the flue gas to low-temperature denitrification; and discharging the flue gas. Further disclosed is the low-temperature desulfurization and denitrification system for flue gas from a biomass power plant.

Description

用于生物质电厂烟气的低温脱硫脱硝方法和系统Method and system for low-temperature desulfurization and denitrification of flue gas from biomass power plants
相关申请的交叉引用Cross References to Related Applications
本申请基于申请日为2021年9月28日、申请号为202111145563.6的中国专利申请提出,并要求该中国专利申请的优先权,该中国专利申请的全部内容在此引入本申请作为参考。This application is based on the Chinese patent application with the application date of September 28, 2021 and the application number 202111145563.6, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated by reference into this application.
技术领域technical field
本公开涉及气体净化的技术领域,具体地,涉及一种用于生物质电厂烟气的低温脱硫脱硝方法和系统。The present disclosure relates to the technical field of gas purification, in particular to a method and system for low-temperature desulfurization and denitrification of flue gas from biomass power plants.
背景技术Background technique
生物质电厂是以生物质能源作燃料的锅炉,其中农业生产过程中的废弃物,如农作物秸秆、农业加工业的废弃物等都可作为生物质电厂的燃料,因此与燃煤电厂相比,生物质能源具有可再生性、低污染性、原料来源十分丰富等优点。生物质锅炉产生的烟气含有二氧化硫、氮氧化物等污染物。相关技术中在高温条件下对生物质电厂产生的烟气进行脱硫和脱硝处理,但是脱硫和脱硝的效率低。Biomass power plants are boilers fueled by biomass energy. Wastes from the agricultural production process, such as crop stalks and agricultural processing waste, can be used as fuels for biomass power plants. Therefore, compared with coal-fired power plants, Biomass energy has the advantages of renewability, low pollution, and abundant sources of raw materials. The flue gas produced by the biomass boiler contains pollutants such as sulfur dioxide and nitrogen oxides. In related technologies, desulfurization and denitrification are performed on the flue gas produced by biomass power plants under high temperature conditions, but the desulfurization and denitrification efficiencies are low.
发明内容Contents of the invention
本公开旨在至少在一定程度上解决相关技术中的技术问题之一。The present disclosure aims to solve one of the technical problems in the related art at least to a certain extent.
为此,本公开的实施例提出一种用于生物质电厂烟气的低温脱硫脱硝方法,所述用于生物质电厂烟气的低温脱硫脱硝方法具有脱硝率高和脱硫率高的优点。For this reason, the embodiments of the present disclosure propose a low-temperature desulfurization and denitrification method for flue gas from a biomass power plant, which has the advantages of high denitrification rate and high desulfurization rate.
本公开的实施例还提出一种用于生物质电厂烟气的低温脱硫脱硝系统,所述用于生物质电厂烟气的低温脱硫脱硝系统具有脱硝率高和脱硫率高的优点。Embodiments of the present disclosure also propose a low-temperature desulfurization and denitrification system for flue gas from a biomass power plant, which has the advantages of high denitrification rate and high desulfurization rate.
根据本公开实施例的用于生物质电厂烟气的低温脱硫脱硝方法,其特征在于,包括以下步骤:将烟气的温度降到5℃-15℃;将所述烟气进行低温脱硫;将所述烟气的温度降到-10℃以下;将所述烟气进行低温脱硝;将所述烟气排放。The low-temperature desulfurization and denitrification method for biomass power plant flue gas according to an embodiment of the present disclosure is characterized in that it includes the following steps: reducing the temperature of the flue gas to 5°C-15°C; performing low-temperature desulfurization on the flue gas; The temperature of the flue gas drops below -10°C; the flue gas is subjected to low-temperature denitrification; and the flue gas is discharged.
本公开实施例的用于生物质电厂烟气的低温脱硫脱硝方法将烟气降温至5℃-15℃,再对温度在5℃-15℃的烟气进行脱硫处理,烟气在5℃-15℃的低温条件下脱硫效率高,因此增大了本公开实施例用于生物质电厂烟气的低温脱硫脱硝方法的脱硫率。对经过降温的烟气进行再次降温,其中将烟气的温度降低至-10℃以下,再对温度在-10℃以下的低温烟气进行脱硝处理,烟气在-10℃以下的低温条件下脱硝效率高,因此增大了本公开实施例用于生物质电厂烟气的低温脱硫脱硝方法的脱硝率。The low-temperature desulfurization and denitrification method for biomass power plant flue gas in the embodiment of the present disclosure lowers the temperature of the flue gas to 5°C-15°C, and then desulfurizes the flue gas at a temperature of 5°C-15°C. The desulfurization efficiency is high under the low temperature condition of 15° C., so the desulfurization rate of the low-temperature desulfurization and denitrification method used in the flue gas of the biomass power plant according to the embodiment of the present disclosure is increased. The cooled flue gas is cooled again, wherein the temperature of the flue gas is lowered to below -10°C, and then the low-temperature flue gas with a temperature below -10°C is subjected to denitrification treatment, and the flue gas is kept at a low temperature below -10°C The denitrification efficiency is high, so the denitrification rate of the low-temperature desulfurization and denitrification method used in the flue gas of the biomass power plant according to the embodiment of the present disclosure is increased.
由此,本公开实施例用于生物质电厂烟气的低温脱硫脱硝方法具有脱硝率高和脱硫率 高的优点。Therefore, the low-temperature desulfurization and denitrification method used in the embodiment of the present disclosure for the flue gas of a biomass power plant has the advantages of high denitrification rate and high desulfurization rate.
在一些实施例中,所述将烟气的温度降到5℃-15℃包括:将所述烟气通入省煤器,使所述烟气的温度降到120℃-150℃;将所述烟气通入制冷系统,使所述烟气的温度降到5℃-15℃。In some embodiments, reducing the temperature of the flue gas to 5°C-15°C includes: passing the flue gas into an economizer to reduce the temperature of the flue gas to 120°C-150°C; The flue gas is passed into the refrigeration system to reduce the temperature of the flue gas to 5°C-15°C.
在一些实施例中,在所述将所述烟气通入省煤器之后,在所述将所述烟气通入制冷系统之前,将所述烟气通入回冷器,使所述烟气的温度降到30℃-60℃;在所述将所述烟气进行低温脱硝之后,在所述将所述烟气排放之前,将所述烟气通入所述回冷器,以对所述回冷器进行冷却。In some embodiments, after the flue gas is passed into the economizer, before the flue gas is passed into the refrigeration system, the flue gas is passed into the recooler, so that the flue gas The temperature of the gas is lowered to 30°C-60°C; after the low-temperature denitrification of the flue gas, before the discharge of the flue gas, the flue gas is passed into the recooler to The recooler performs cooling.
在一些实施例中,在所述将所述烟气通入省煤器之后,在所述将所述烟气通入回冷器之前,将所述烟气通入所述水冷器,使所述烟气的温度降到60℃-90℃;向所述水冷器通入冷却水,以对所述水冷器进行冷却。In some embodiments, after the flue gas is passed into the economizer and before the flue gas is passed into the recooler, the flue gas is passed into the water cooler, so that the The temperature of the flue gas is lowered to 60°C-90°C; cooling water is passed into the water cooler to cool the water cooler.
在一些实施例中,在所述将所述烟气通入省煤器之后,在所述将所述烟气通入所述水冷器之前,将所述烟气进行除尘。In some embodiments, after the flue gas is passed into the economizer and before the flue gas is passed into the water cooler, the flue gas is dedusted.
在一些实施例中,所述将所述烟气的温度降到-10℃以下包括:将所述烟气通入深冷系统,以使所述烟气的温度降到-10℃以下。In some embodiments, reducing the temperature of the flue gas to below -10°C includes: passing the flue gas into a cryogenic system to reduce the temperature of the flue gas to below -10°C.
根据本公开实施例的用于生物质电厂烟气的低温脱硫脱硝系统包括:生物质锅炉,所述生物质锅炉包括烟气排放口;制冷系统,所述制冷系统包括第一烟气进口和第一烟气出口,所述烟气排放口与所述第一烟气进口连通,以便将烟气通入所述制冷系统内,从而将烟气的温度降到5℃-15℃;第一低温吸附塔,所述第一低温吸附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第一低温吸附塔内,从而对所述烟气进行脱硫;深冷系统,所述深冷系统包括第三烟气进口和第三烟气出口,所述第二烟气出口与所述第三烟气进口连通,以便将烟气通入所述深冷系统内,从而将烟气的温度降到-10℃以下;第二低温吸附塔,所述第二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第二低温吸附塔内,从而对所述烟气进行脱硝;和烟筒,所述烟筒的进口与所述第四烟气出口连通,以便排放所述烟气。The low-temperature desulfurization and denitrification system for biomass power plant flue gas according to an embodiment of the present disclosure includes: a biomass boiler including a flue gas discharge port; a refrigeration system including a first flue gas inlet and a second flue gas inlet A flue gas outlet, the flue gas discharge port communicates with the first flue gas inlet, so as to pass the flue gas into the refrigeration system, thereby reducing the temperature of the flue gas to 5°C-15°C; the first low temperature An adsorption tower, the first low-temperature adsorption tower includes a second flue gas inlet and a second flue gas outlet, and the first flue gas outlet communicates with the second flue gas inlet so that the flue gas can be passed into the In the first cryogenic adsorption tower, so that the flue gas is desulfurized; the cryogenic system, the cryogenic system includes a third flue gas inlet and a third flue gas outlet, and the second flue gas outlet is connected to the third flue gas outlet The flue gas inlet is connected so that the flue gas can be passed into the cryogenic system, thereby reducing the temperature of the flue gas to below -10°C; the second low-temperature adsorption tower, the second low-temperature adsorption tower includes a fourth flue gas inlet And the 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 second cryogenic adsorption tower, thereby denitrifying the flue gas; and a chimney, the inlet of the chimney communicates with the fourth flue gas outlet so as to discharge the flue gas.
本公开实施例的用于生物质电厂烟气的低温脱硫脱硝系统通过制冷系统对烟气进行降温,并将烟气的温度降低至5℃-15℃,低温(温度在5℃-15℃)烟气在第一低温吸附塔进行脱硫处理,烟气在5℃-15℃的低温条件下脱硫效率高,因此增大了本公开实施例用于生物质电厂烟气的低温脱硫脱硝系统的脱硫率。经过第一低温吸附塔脱硫处理后的烟气通过深冷系统进行再次降温,并将烟气的温度降低至-10℃以下,降温后的低温烟气(温度在-10℃以下)在第二低温吸附塔内进行脱硝处理,烟气在-10℃以下的低温条件下脱硝效率 高,因此增大了本公开实施例的用于生物质电厂烟气的低温脱硫脱硝系统的脱硝率。The low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure cools the flue gas through a refrigeration system, and reduces the temperature of the flue gas to 5°C-15°C, low temperature (temperature between 5°C-15°C) The flue gas is desulfurized in the first low-temperature adsorption tower, and the desulfurization efficiency of the flue gas is high at a low temperature of 5°C-15°C, so the desulfurization of the low-temperature desulfurization and denitrification system used in the flue gas of a biomass power plant according to the embodiment of the present disclosure is increased. Rate. The flue gas desulfurized by the first low-temperature adsorption tower is cooled again through the cryogenic system, and the temperature of the flue gas is lowered to below -10°C. The denitration treatment is carried out in the low-temperature adsorption tower, and the denitrification efficiency of the flue gas is high at a low temperature below -10°C, so the denitrification rate of the low-temperature desulfurization and denitrification system for flue gas of a biomass power plant in the embodiment of the present disclosure is increased.
由此,本公开实施例用于生物质电厂烟气的低温脱硫脱硝系统具有脱硝率高和脱硫率高的优点。Therefore, the low-temperature desulfurization and denitrification system used in the embodiment of the present disclosure for biomass power plant flue gas has the advantages of high denitrification rate and high desulfurization rate.
在一些实施例中,本公开实施例用于生物质电厂烟气的低温脱硫脱硝系统还包括省煤器,所述省煤器包括第五烟气进口和第五烟气出口,所述烟气排放口与所述第五烟气进口连通,以便将所述烟气通入所述省煤器内,从而使所述烟气的温度降到120℃-150℃,In some embodiments, the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiments of the present disclosure further includes an economizer, the economizer includes a fifth flue gas inlet and a fifth flue gas outlet, and the flue gas The discharge port communicates with the fifth flue gas inlet, so that the flue gas can be passed into the economizer, thereby reducing the temperature of the flue gas to 120°C-150°C,
所述第五烟气出口与所述第一烟气进口连通,以使所述烟气排放口与所述第一烟气进口连通。The fifth smoke outlet communicates with the first smoke inlet, so that the smoke discharge port communicates with the first smoke inlet.
在一些实施例中,本公开实施例的用于生物质电厂烟气的低温脱硫脱硝系统还包括水冷器,所述水冷器包括第六烟气进口和第六烟气出口,所述第五烟气出口与所述第六烟气进口连通,以便将所述烟气通入所述水冷器内,从而使所述烟气的温度降到60℃-90℃,所述第六烟气出口与所述第一烟气进口连通,以使所述第五烟气出口与所述第一烟气进口连通。In some embodiments, the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiments of the present disclosure further includes a water cooler, the water cooler includes a sixth flue gas inlet and a sixth flue gas outlet, and the fifth flue gas The gas outlet is connected with the sixth flue gas inlet so that the flue gas can be passed into the water cooler, thereby reducing the temperature of the flue gas to 60°C-90°C, and the sixth flue gas outlet is connected with the The first flue gas inlet is communicated so that the fifth flue gas outlet communicates with the first flue gas inlet.
在一些实施例中,本公开实施例用于生物质电厂烟气的低温脱硫脱硝系统还包括回冷器,所述回冷器包括第七烟气进口和第七烟气出口,所述第六烟气出口与所述第七烟气进口连通,以便将所述烟气通入所述回冷器内,从而使所述烟气的温度降到30℃-60℃,所述第七烟气出口与所述第一烟气进口连通,以使所述第六烟气出口与所述第一烟气进口连通。In some embodiments, the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure further includes a recooler, the recooler includes a seventh flue gas inlet and a seventh flue gas outlet, and the sixth The flue gas outlet communicates with the seventh flue gas inlet so that the flue gas can be passed into the recooler so that the temperature of the flue gas can be reduced to 30°C-60°C, and the seventh flue gas The outlet communicates with the first flue gas inlet, so that the sixth flue gas outlet communicates with the first flue gas inlet.
附图说明Description of drawings
图1是本公开实施例的用于生物质电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 flue gas from a biomass power plant according to an embodiment of the present disclosure.
图2是本公开实施例的用于生物质电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 biomass power plant flue gas according to an embodiment of the present disclosure.
附图标记:Reference signs:
生物质锅炉1;烟气排放口11;Biomass boiler 1; flue gas discharge port 11;
制冷系统2;第一烟气进口21;第一烟气出口22; Refrigeration system 2; first flue gas inlet 21; first flue gas outlet 22;
第一低温吸附塔3;第二烟气进口31;第二烟气出口32;The first low-temperature adsorption tower 3; the second flue gas inlet 31; the second flue gas outlet 32;
深冷系统4;第三烟气进口41;第三烟气出口42; Cryogenic system 4; third flue gas inlet 41; third flue gas outlet 42;
第二低温吸附塔5;第四烟气进口51;第四烟气出口52;The second low-temperature adsorption tower 5; the fourth flue gas inlet 51; the fourth flue gas outlet 52;
烟筒6;进口61;出口62;Chimney 6; Import 61; Export 62;
省煤器7;第五烟气进口71;第五烟气出口72;Economizer 7; fifth flue gas inlet 71; fifth flue gas outlet 72;
水冷器8;第六烟气进口81;第六烟气出口82;Water cooler 8; sixth flue gas inlet 81; sixth flue gas outlet 82;
回冷器9;第七烟气进口91;第七烟气出口92;低温烟气管道93;第八烟气进口931;第八烟气出口932;Recooler 9; seventh flue gas inlet 91; seventh flue gas outlet 92; low temperature flue gas pipeline 93; eighth flue gas inlet 931; eighth flue gas outlet 932;
除尘器10;进气口101;出气口102;出尘口103; Dust collector 10; air inlet 101; air outlet 102; dust outlet 103;
引风机20;进风口201;出风口202。Induced fan 20; air inlet 201; air outlet 202.
具体实施方式Detailed ways
下面详细描述本公开的实施例,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,旨在用于解释本公开,而不能理解为对本公开的限制。Embodiments of the present disclosure 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 disclosure and should not be construed as limiting the present disclosure.
本公开是基于发明人对以下事实和问题的发现和认识做出的:The present disclosure is made based on the inventors' discovery and recognition of the following facts and problems:
相关技术的脱硫效率一般达70%,脱硫剂为石灰石,石灰石在高温下分解为氧化钙和二氧化碳,烟气中的SO 2发生化学反应被脱除。相关技术采用该方法进行炉内喷钙脱硫的效率大约在60%-65%,因此脱硫效率低。 The desulfurization efficiency of the related technology is generally up to 70%. The desulfurization agent is limestone, which decomposes into calcium oxide and carbon dioxide at high temperature, and the SO2 in the flue gas undergoes a chemical reaction to be removed. In the related art, the efficiency of desulfurization by calcium spraying in the furnace by this method is about 60%-65%, so the desulfurization efficiency is low.
相关技术是将NH 3、尿素等还原剂喷入锅炉炉内与NO x进行选择性反应,无需催化剂,并且必须在高温条件下加入还原剂,还原剂热分解成NH 3,与烟气中的NO x反应生成N 2和水,进而对烟气进行脱硝处理。相关技术的脱硝效率一般为30%-80%,其受锅炉炉膛温度影响很大。相关技术的脱硝效率在850℃以上可达到60%,在900℃达到最大值,因此脱硝效率低。 The related technology is to spray NH 3 , urea and other reducing agents into the boiler furnace for selective reaction with NO x , no catalyst is needed, and the reducing agent must be added under high temperature conditions. The reducing agent is thermally decomposed into NH 3 , which reacts with the NO x NO x reacts to generate N 2 and water, and then denitrates the flue gas. The denitrification efficiency of related technologies is generally 30%-80%, which is greatly affected by the furnace temperature of the boiler. The denitrification efficiency of the related technology can reach 60% above 850°C and reaches the maximum at 900°C, so the denitrification efficiency is low.
下面参考附图描述本公开实施例的用于生物质电厂烟气的低温脱硫脱硝系统。The low-temperature desulfurization and denitrification system for biomass power plant flue gas according to the embodiments of the present disclosure will be described below with reference to the accompanying drawings.
如图1-图2所示,根据本公开实施例的用于生物质电厂烟气的低温脱硫脱硝系统包括生物质锅炉1、制冷系统2、第一低温吸附塔3、深冷系统4、第二低温吸附塔5和烟筒6。As shown in Figures 1-2, the low-temperature desulfurization and denitrification system for biomass power plant flue gas according to an embodiment of the present disclosure includes a biomass boiler 1, a refrigeration system 2, a first low-temperature adsorption tower 3, a cryogenic system 4, a second Two cryogenic adsorption towers 5 and chimneys 6.
生物质锅炉1包括烟气排放口11,具体地,将生物质燃料送至生物质锅炉1中焚烧,焚烧产生的烟气从烟气排放口11排出。The biomass boiler 1 includes a flue gas discharge port 11 , specifically, the biomass fuel is sent to the biomass boiler 1 for incineration, and the flue gas generated by incineration is discharged from the flue gas discharge port 11 .
制冷系统2包括第一烟气进口21和第一烟气出口22,烟气排放口11与第一烟气进口21连通,以便将烟气通入制冷系统2内,从而将烟气的温度降到5℃-15℃。The refrigeration system 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 refrigeration system 2, thereby reducing the temperature of the flue gas. to 5°C-15°C.
具体地,如图1所示,经过生物质锅炉1焚烧后的烟气从烟气排放口11排出后,通过第一烟气进口21进入制冷系统2中,制冷系统2对烟气进行降温处理,其中经过降温处理后的烟气的温度为5℃-15℃。经过降温的烟气从第一烟气出口22排出制冷系统2。Specifically, as shown in Figure 1, after the flue gas incinerated by the biomass boiler 1 is discharged from the flue gas discharge port 11, it enters the refrigeration system 2 through the first flue gas inlet 21, and the refrigeration system 2 performs cooling treatment on the flue gas , wherein the temperature of the flue gas after cooling treatment is 5°C-15°C. The cooled flue gas exits the refrigeration system 2 from the first flue gas outlet 22 .
第一低温吸附塔3包括第二烟气进口31和第二烟气出口32,第一烟气出口22与第二烟气进口31连通,以便将烟气通入第一低温吸附塔3内,从而对烟气进行脱硫。The first low-temperature adsorption tower 3 comprises a second flue gas inlet 31 and a second flue gas outlet 32, and the first flue gas outlet 22 communicates with the second flue gas inlet 31, so that flue gas is passed into the first low-temperature adsorption tower 3, To desulfurize the flue gas.
具体地,如图1所示,经过降温处理的烟气从第二烟气进口31进入第一低温吸附塔3中,烟气在第一低温吸附塔3中进行脱硫处理,经过第一低温吸附塔3脱硫后的烟气从第二烟气出口32排出第一低温吸附塔3。Specifically, as shown in Figure 1, the flue gas that has been cooled down enters the first low-temperature adsorption tower 3 from the second flue gas inlet 31, and the flue gas is desulfurized in the first low-temperature adsorption tower 3, and after the first low-temperature adsorption The flue gas desulfurized by the tower 3 is discharged from the first cryogenic adsorption tower 3 through the second flue gas outlet 32 .
可以理解的是,第一低温吸附塔3的塔身高度尺寸大,进而使第一低温吸附塔3中的烟气能够在第一低温吸附塔3内充分发生反应,因此本公开实施例的增大了用于生物质电厂烟气的低温脱硫脱硝系统的脱硫率。It can be understood that the height of the tower body of the first cryogenic adsorption tower 3 is large, so that the flue gas in the first cryogenic adsorption tower 3 can fully react in the first cryogenic adsorption tower 3, so the increase in the embodiment of the present disclosure The desulfurization rate of the low-temperature desulfurization and denitrification system used for biomass power plant flue gas is increased.
此外,第一低温吸附塔3内设有用于脱硫的活性炭,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。In addition, the first low-temperature adsorption tower 3 is equipped with activated carbon for desulfurization. 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 compounds and oxygen. The product after the reaction can achieve the effect of desulfurization.
深冷系统4包括第三烟气进口41和第三烟气出口42,第二烟气出口32与第三烟气进口41连通,以便将烟气通入深冷系统4内,从而将烟气的温度降到-10℃以下。The cryogenic system 4 includes a third flue gas inlet 41 and a third flue gas outlet 42, the second flue gas outlet 32 communicates with the third flue gas inlet 41, so that the flue gas is passed into the cryogenic system 4, thereby the flue gas The temperature drops below -10°C.
具体地,如图1所示,经过脱硫处理的烟气从第三烟气进口41进入深冷系统4中,烟气在深冷系统4中再次进行降温处理,其中经过降温处理后的烟气的温度为-10℃以下,降温后的烟气从第三烟气出口42排出深冷系统4。Specifically, as shown in Figure 1, the flue gas that has undergone desulfurization treatment enters the cryogenic system 4 from the third flue gas inlet 41, and the flue gas is subjected to cooling treatment again in the cryogenic system 4, wherein the flue gas after the cooling treatment The temperature is below -10°C, and the cooled flue gas is discharged from the cryogenic system 4 through the third flue gas outlet 42 .
第二低温吸附塔5包括第四烟气进口51和第四烟气出口52,第三烟气出口42与第四烟气进口51连通,以便将烟气通入第二低温吸附塔5内,从而对烟气进行脱硝。The second low-temperature adsorption tower 5 includes a fourth flue gas inlet 51 and a fourth flue gas outlet 52, and the third flue gas outlet 42 communicates with the fourth flue gas inlet 51, so that flue gas is passed into the second low-temperature adsorption tower 5, To denitrify the flue gas.
具体地,如图1所示,经过深冷系统4降温后的烟气从第四烟气进口51进入第二低温吸附塔5中,烟气在第二低温吸附塔5中进行脱硝处理。经过脱硝处理的烟气从第四烟气出口52排出第二低温吸附塔5。Specifically, as shown in FIG. 1 , the flue gas cooled by the cryogenic system 4 enters the second cryogenic adsorption tower 5 from the fourth flue gas inlet 51 , and the flue gas is denitrated in the second cryogenic adsorption tower 5 . The denitrified flue gas exits the second cryogenic adsorption tower 5 from the fourth flue gas outlet 52 .
可以理解的是,第二低温吸附塔5内设置有活性焦,活性焦的表面上具有微孔,能够吸附含硫烟气中的氮氧化合物。此外,活性焦能够对烟气中的NO产生催化还原反应,在还原剂NH 3的作用下将NO还原为N 2,进而达到脱硝和脱氨的目的。 It can be understood that the second cryogenic adsorption tower 5 is provided with activated coke, and the surface of the activated coke has micropores capable of adsorbing nitrogen oxides in sulfur-containing flue gas. In addition, activated coke can produce a catalytic reduction reaction for NO in flue gas, and reduce NO to N 2 under the action of reducing agent NH 3 , thereby achieving the purpose of denitrification and deammonization.
如图1所示,烟筒6的进口61与第四烟气出口52连通,以便排放烟气。具体地,经过第二低温吸附塔5脱硝处理后的烟气通过烟筒6的进口61进入烟筒6,烟气从烟筒6的出口62排放到外界。As shown in FIG. 1 , the inlet 61 of the chimney 6 communicates with the fourth flue gas outlet 52 to discharge the flue gas. Specifically, the flue gas after denitration treatment by the second low temperature adsorption tower 5 enters the chimney 6 through the inlet 61 of the chimney 6 , and the flue gas is discharged to the outside from the outlet 62 of the chimney 6 .
本公开实施例的用于生物质电厂烟气的低温脱硫脱硝系统通过制冷系统2对烟气进行降温,并将烟气的温度降低至5℃-15℃,低温(温度在5℃-15℃)烟气在第一低温吸附塔3进行脱硫处理,烟气在5℃-15℃的低温条件下脱硫效率高,因此增大了本公开实施例用于生物质电厂烟气的低温脱硫脱硝系统的脱硫率。经过第一低温吸附塔3脱硫处理后的烟气通过深冷系统4进行再次降温,并将烟气的温度降低至-10℃以下,降温后的低温烟气(温度在-10℃以下)在第二低温吸附塔5内进行脱硝处理,烟气在-10℃以下的低温条件下脱硝效率高,因此增大了本公开实施例用于生物质电厂烟气的低温脱硫脱硝系统的脱硝率。The low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure cools the flue gas through the refrigeration system 2, and reduces the temperature of the flue gas to 5°C-15°C. ) The flue gas is desulfurized in the first low-temperature adsorption tower 3, and the flue gas has a high desulfurization efficiency at a low temperature of 5° C. to 15° C. Therefore, the low-temperature desulfurization and denitrification system used in the flue gas of a biomass power plant in this disclosed embodiment is increased. desulfurization rate. The flue gas desulfurized by the first low-temperature adsorption tower 3 is cooled again by the cryogenic system 4, and the temperature of the flue gas is lowered to below -10°C, and the cooled low-temperature flue gas (temperature below -10°C) is The denitration treatment is carried out in the second low-temperature adsorption tower 5, and the denitrification efficiency of the flue gas is high at a low temperature below -10°C, so the denitrification rate of the low-temperature desulfurization and denitrification system used in the flue gas of a biomass power plant according to the embodiment of the present disclosure is increased.
由此,本公开实施例用于生物质电厂烟气的低温脱硫脱硝系统具有脱硝率高和脱硫率高的优点。Therefore, the low-temperature desulfurization and denitrification system used in the embodiment of the present disclosure for biomass power plant flue gas has the advantages of high denitrification rate and high desulfurization rate.
在一些实施例中,第一低温吸附塔3内可以设有熟石灰,可以理解的是,第一低温吸附塔3通过熟石灰与烟气进行反应进而对烟气进行脱硫处理,因此第一低温吸附塔3能够去除烟气中的含硫化合物。其中,第一低温吸附塔3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 be provided in the first low-temperature adsorption tower 3. It can be understood that the first low-temperature adsorption tower 3 reacts with the flue gas to desulfurize the flue gas. Therefore, the first low-temperature adsorption tower 3 can remove sulfur compounds in flue gas. Wherein, the desulfurization treatment of the flue gas by the first low-temperature adsorption tower 3 includes dry desulfurization and semi-dry desulfurization.
在一些实施例中,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,将第一低温吸附塔3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。在一些实施例中,采用半干法脱硫去除烟尘中的含硫化合物。其中,将熟石灰浆喷洒在第一低温吸附塔3内,使熟石灰浆在第一低温吸附塔3均匀地分布在第一低温吸附塔3内,使烟气与第一低温吸附塔3内的熟石灰反应,进而去除烟气中的含硫化合物。In some embodiments, 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 first cryogenic adsorption tower 3 is reacted with dry slaked lime to remove sulfur-containing compounds in the flue gas. sulfur compounds. In some embodiments, semi-dry desulfurization is used to remove sulfur compounds in the flue dust. Wherein, the hydrated lime slurry is sprayed in the first low-temperature adsorption tower 3, so that the hydrated lime slurry is evenly distributed in the first low-temperature adsorption tower 3, so that the flue gas and the hydrated lime in the first low-temperature adsorption tower 3 reaction, and then remove sulfur compounds in the flue gas.
在一些实施例中,如图2所示,本公开实施例用于生物质电厂烟气的低温脱硫脱硝系统还包括省煤器7。In some embodiments, as shown in FIG. 2 , the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure further includes an economizer 7 .
省煤器7包括第五烟气进口71和第五烟气出口72,烟气排放口11与第五烟气进口71连通,以便将烟气通入省煤器7内,从而使烟气的温度降到120℃-150℃,第五烟气出口72与第一烟气进口21连通,以使烟气排放口11与第一烟气进口21连通。The economizer 7 includes a fifth flue gas inlet 71 and a fifth flue gas outlet 72, and the flue gas discharge port 11 communicates with the fifth flue gas inlet 71, so that the flue gas is passed into the economizer 7, so that the flue gas When the temperature drops to 120° C.-150° C., the fifth flue gas outlet 72 communicates with the first flue gas inlet 21 , so that the flue gas discharge port 11 communicates with the first flue gas inlet 21 .
具体地,从生物质锅炉1排出的烟气经烟气排放口11排出,通过第五烟气出口72进入省煤器7中,烟气在省煤器7中进行降温处理,将温度降至120℃-150℃,经过降温后的烟气通过第五烟气出口72排出省煤器7,并通过与第一烟气进口21进入制冷系统2。Specifically, the flue gas discharged from the biomass boiler 1 is discharged through the flue gas discharge port 11, enters the economizer 7 through the fifth flue gas outlet 72, and the flue gas is cooled in the economizer 7 to reduce the temperature to 120°C-150°C, the cooled flue gas exits the economizer 7 through the fifth flue gas outlet 72, and enters the refrigeration system 2 through the first flue gas inlet 21.
可以理解的是,烟气在省煤器7中进行降温处理是通过省煤器7与烟气进行换热,进而使省煤器7吸收烟气一部分的热量,因此使烟气的温度降低。并且省煤器7吸收高温烟气的热量将省煤器7内的制冷剂加热,被加热后的制冷剂的热量可以为其他装置提供能源,进而将吸收的热量进行再利用,因此提高了能源的利用率。It can be understood that the temperature reduction treatment of the flue gas in the economizer 7 is through the heat exchange between the economizer 7 and the flue gas, and then the economizer 7 absorbs part of the heat of the flue gas, thereby reducing the temperature of the flue gas. And the economizer 7 absorbs the heat of high-temperature flue gas to heat the refrigerant in the economizer 7, and the heat of the heated refrigerant can provide energy for other devices, and then reuse the absorbed heat, thus improving energy efficiency. utilization rate.
在一些实施例中,本公开实施例用于生物质电厂烟气的低温脱硫脱硝系统还包括水冷器8。In some embodiments, the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure further includes a water cooler 8 .
水冷器8包括第六烟气进口81和第六烟气出口82,第五烟气出口72与第六烟气进口81连通,以便将烟气通入水冷器8内,从而使烟气的温度降到60℃-90℃,第六烟气出口82与第一烟气进口21连通,以使第五烟气出口72与第一烟气进口21连通,也就是说,水冷器8设置在省煤器7与制冷系统2之间。The water cooler 8 includes a sixth flue gas inlet 81 and a sixth flue gas outlet 82, the fifth flue gas outlet 72 communicates with the sixth flue gas inlet 81, so that the flue gas is passed into the water cooler 8, so that the temperature of the flue gas down to 60°C-90°C, the sixth flue gas outlet 82 communicates with the first flue gas inlet 21, so that the fifth flue gas outlet 72 communicates with the first flue gas inlet 21, that is to say, the water cooler 8 is set in the provincial Between the coal burner 7 and the refrigeration system 2.
具体地,经过省煤器7降温后的烟气从第五烟气出口72排出,通过第六烟气进口81进入水冷器8中。烟气在水冷器8中进行降温处理,其中经过水冷器8降温后的烟气温度在60℃-90℃。经过水冷器8降温后的烟气从第六烟气出口82排出,通过第一烟气进口21进入制冷系统2中,因此第五烟气出口72与第一烟气进口21连通。Specifically, the flue gas cooled by the economizer 7 is discharged from the fifth flue gas outlet 72 and enters the water cooler 8 through the sixth flue gas inlet 81 . The temperature of the flue gas is lowered in the water cooler 8, wherein the temperature of the flue gas after cooling by the water cooler 8 is between 60°C and 90°C. The flue gas cooled by the water cooler 8 is discharged from the sixth flue gas outlet 82 and enters the refrigeration system 2 through the first flue gas inlet 21 , so the fifth flue gas outlet 72 communicates with the first flue gas inlet 21 .
可以理解的是,将经过省煤器7降温后的烟气通入水冷器8中进行再次降温,使烟气的温度降至60℃-90℃后,再将烟气通入制冷系统2中,减小了制冷系统2的负荷,因此提高了制冷系统2的使用寿命。It can be understood that the flue gas that has been cooled by the economizer 7 is passed into the water cooler 8 for further cooling, so that the temperature of the flue gas is reduced to 60°C-90°C, and then the flue gas is passed into the refrigeration system 2 , reducing the load on the refrigeration system 2, thus increasing the service life of the refrigeration system 2.
进一步地,水冷器8还包括冷却水管道,冷却水管道用于通入冷却水,以便与烟气换热,从而使烟气的温度降到60℃-90℃。Further, the water cooler 8 also includes a cooling water pipe, which is used to feed cooling water to exchange heat with the flue gas, thereby reducing the temperature of the flue gas to 60°C-90°C.
在一些实施例中,如图2所示,本公开实施例用于生物质电厂烟气的低温脱硫脱硝系统还包括除尘器10,除尘器10包括进气口101和出气口102,进气口101与第五烟气出口72连通,以便将烟气通入除尘器10,出气口102与第六烟气进口81连通,以使第五烟气出口72与第六烟气进口81连通。In some embodiments, as shown in FIG. 2 , the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure further includes a dust collector 10. The dust collector 10 includes an air inlet 101 and an air outlet 102. The air inlet 101 communicates with the fifth flue gas outlet 72 so as to pass the flue gas into the dust collector 10 , and the gas outlet 102 communicates with the sixth flue gas inlet 81 so that the fifth flue gas outlet 72 communicates with the sixth flue gas inlet 81 .
具体地,经过省煤器7处理后的烟气从第五烟气出口72排出,通过进气口101进入除尘器10中,除尘器10对烟气进行除尘处理,其中除尘器10能够除去烟气中的烟尘,经过除尘后的烟气从除尘器10的出气口102排出。Specifically, the flue gas processed by the economizer 7 is discharged from the fifth flue gas outlet 72, and enters the dust collector 10 through the air inlet 101, and the dust collector 10 performs dust removal treatment on the flue gas, wherein the dust collector 10 can remove smoke The flue gas in the air is discharged from the gas outlet 102 of the dust collector 10 after dust removal.
此外,除尘器10还包括出尘口103,从烟气中去除的烟尘从除尘器10的出尘口103排出,进而避免除尘器10残留的烟尘对烟气造成二次污染。In addition, the dust collector 10 also includes a dust outlet 103 , and the dust removed from the flue gas is discharged from the dust outlet 103 of the dust collector 10 , so as to prevent secondary pollution of the flue gas by the dust remaining in the dust collector 10 .
在一些实施例中,如图2所示,本公开实施例用于生物质电厂烟气的低温脱硫脱硝系统还包括引风机20,引风机20设在水冷器8和除尘器10之间,引风机的进风口201与出气口102连通,引风机的出风口202与第六烟气进口81连通,从而使第六烟气进口81与出气口202连通。In some embodiments, as shown in FIG. 2 , the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure further includes an induced draft fan 20, and the induced draft fan 20 is arranged between the water cooler 8 and the dust collector 10, and the induced draft fan 20 The air inlet 201 of the fan communicates with the air outlet 102 , and the air outlet 202 of the induced draft fan communicates with the sixth flue gas inlet 81 , so that the sixth flue gas inlet 81 communicates with the air outlet 202 .
具体地,除尘器10排出的烟气从进风口进入引风机20中,从引风机20的出风口202排出。可以理解的是,引风机20具有可转动的扇叶,扇叶旋转进而加快烟气的流速,因此引风机20能够加快本公开实施例用于生物质电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 dust collector 10 enters the induced draft fan 20 from the air inlet, and is discharged from the air outlet 202 of the induced draft fan 20 . It can be understood that the induced draft fan 20 has rotatable fan blades, and the fan blades rotate to increase the flow velocity of the flue gas. Therefore, the induced draft fan 20 can accelerate the flow rate of the flue gas in the low-temperature desulfurization and denitrification system for the flue gas of a biomass power plant according to the embodiment of the present disclosure. cycle speed.
在一些实施例中,如图2所示,本公开实施例用于生物质电厂烟气的低温脱硫脱硝系统还包括回冷器9。In some embodiments, as shown in FIG. 2 , the low-temperature desulfurization and denitrification system for biomass power plant flue gas in the embodiment of the present disclosure further includes a recooler 9 .
回冷器9包括第七烟气进口91和第七烟气出口92,第六烟气出口82与第七烟气进口91连通,以便将烟气通入回冷器9内,从而使烟气的温度降到30℃-60℃,第七烟气出口92与第一烟气进口21连通,以使第六烟气出口82与第一烟气进口21连通。The recooler 9 includes a seventh flue gas inlet 91 and a seventh flue gas outlet 92, and the sixth flue gas outlet 82 communicates with the seventh flue gas inlet 91 so as to pass the flue gas into the recooler 9, so that the flue gas When the temperature drops to 30°C-60°C, the seventh flue gas outlet 92 communicates with the first flue gas inlet 21, so that the sixth flue gas outlet 82 communicates with the first flue gas inlet 21.
具体地,经过水冷器8降温后的烟气从第七烟气进口91进入回冷器9中,烟气在回冷器9中进行降温处理,其中回冷器9将烟气的温度降至30℃-60℃,经过回冷器9降温后的烟气从第七烟气出口92排出,再通过第一烟气进口21进入制冷系统2中。Specifically, the flue gas cooled by the water cooler 8 enters the recooler 9 from the seventh flue gas inlet 91, and the flue gas is cooled in the recooler 9, wherein the recooler 9 reduces the temperature of the flue gas to 30°C-60°C, the flue gas cooled by the recooler 9 is discharged from the seventh flue gas outlet 92, and then enters the refrigeration system 2 through the first flue gas inlet 21.
可以理解的是,将经过水冷器8降温后的烟气通入回冷器9中进行再次降温,使烟气的温度降至30℃-60℃后,再将烟气通入制冷系统2中,进而减小了制冷系统2的负荷,因此提高了制冷系统2的使用寿命。It can be understood that the flue gas that has been cooled by the water cooler 8 is passed into the recooler 9 for further cooling, so that the temperature of the flue gas is reduced to 30°C-60°C, and then the flue gas is passed into the refrigeration system 2 , thereby reducing the load on the refrigeration system 2, thus increasing the service life of the refrigeration system 2.
进一步地,回冷器9包括低温烟气管道93,低温烟气管道93包括第八烟气进口931和第八烟气出口932,第四烟气出口52与第八烟气进口931连通,以便将烟气通入低温烟气管道93内,从而冷却回冷器9。Further, the recooler 9 includes a low-temperature flue gas pipeline 93, the low-temperature flue gas pipeline 93 includes an eighth flue gas inlet 931 and an eighth flue gas outlet 932, and the fourth flue gas outlet 52 communicates with the eighth flue gas inlet 931, so that The flue gas is passed into the low-temperature flue gas pipeline 93 to cool the recooler 9 .
具体地,经过第二低温吸附塔5脱硝处理后的烟气从第四烟气出口52排出,并通过低 温烟气管道93的第八烟气进口931进入回冷器9中,低温烟气管道93中的低温烟气与回冷器9中的烟气(经过水冷器8降温后的烟气,烟气的温度为60℃-90℃)进行换热,进而将回冷器9中烟气的温度降至30℃-60℃。低温烟气管道93中烟气的温度小于回冷器9中烟气的温度,可以理解的是,其中低温烟气管道93中烟气在深冷系统4中进行过降温处理,因此低温烟气的温度在-10℃以下,而从水冷器8中通入回冷器9的烟气温度为60℃-90℃。Specifically, the flue gas after denitrification treatment in the second low-temperature adsorption tower 5 is discharged from the fourth flue gas outlet 52, and enters the recooler 9 through the eighth flue gas inlet 931 of the low-temperature flue gas pipeline 93, and the low-temperature flue gas pipeline The low-temperature flue gas in 93 exchanges heat with the flue gas in the recooler 9 (the flue gas cooled by the water cooler 8, the temperature of the flue gas is 60°C-90°C), and then the flue gas in the recooler 9 The temperature drops to 30°C-60°C. The temperature of the flue gas in the low-temperature flue gas pipeline 93 is lower than the temperature of the flue gas in the recooler 9. It can be understood that the flue gas in the low-temperature flue gas pipeline 93 has undergone cooling treatment in the cryogenic system 4, so the low-temperature flue gas The temperature of the gas is below -10°C, and the temperature of the flue gas passing from the water cooler 8 to the recooler 9 is 60°C-90°C.
可以理解的是,深冷系统4对烟气进行降温时需要耗费能源,利用第二低温吸附塔5处理后的低温烟气(温度为-10℃以下)对回冷器9中的烟气(温度为60℃-90℃)进行降温,充分的利用了深冷系统4的烟气降温时所消耗的能源,因此提高了能源的利用率。It can be understood that the cryogenic system 4 consumes energy when cooling the flue gas. The low-temperature flue gas (temperature below -10°C) treated by the second cryogenic adsorption tower 5 is used to cool the flue gas in the recooler 9 ( The temperature is 60° C.-90° C.) for cooling, which fully utilizes the energy consumed when the flue gas of the cryogenic system 4 cools down, thus improving the utilization rate of energy.
在一些实施例中,第八烟气出口932与烟筒6的进口61连通,从而使烟筒6的进口61与第四烟气出口52连通,以便排放烟气。具体地,低温烟气管道93中的低温烟气进行换热后从第八烟气出口932排出,并从烟筒6的进口61进入烟筒6中,并通过出口排到外界。In some embodiments, the eighth flue gas outlet 932 communicates with the inlet 61 of the chimney 6 , so that the inlet 61 of the chimney 6 communicates with the fourth flue gas outlet 52 to discharge the flue gas. Specifically, the low-temperature flue gas in the low-temperature flue gas pipe 93 is discharged from the eighth flue gas outlet 932 after heat exchange, enters the chimney 6 from the inlet 61 of the chimney 6, and is discharged to the outside through the outlet.
下面参考附图描述本公开实施例的用于生物质电厂烟气的低温脱硫脱硝方法。本公开实施例的用于生物质电厂烟气的低温脱硫脱硝方法利用上述的用于生物质电厂烟气的低温脱硫脱硝系统。The low-temperature desulfurization and denitrification method for biomass power plant flue gas according to the embodiments of the present disclosure will be described below with reference to the accompanying drawings. The low-temperature desulfurization and denitrification method for biomass power plant flue gas in the embodiment of the present disclosure utilizes the above-mentioned low-temperature desulfurization and denitrification system for biomass power plant flue gas.
根据本公开实施例的用于生物质电厂烟气的低温脱硫脱硝方法,包括以下步骤:将烟气的温度降到5℃-15℃;将烟气进行低温脱硫;将烟气的温度降到-10℃以下;将烟气进行低温脱硝;将烟气排放。The low-temperature desulfurization and denitrification method for flue gas of a biomass power plant according to an embodiment of the present disclosure includes the following steps: reducing the temperature of the flue gas to 5°C-15°C; performing low-temperature desulfurization of the flue gas; reducing the temperature of the flue gas to Below -10°C; conduct low-temperature denitrification of the flue gas; discharge the flue gas.
本公开实施例的用于生物质电厂烟气的低温脱硫脱硝方法将烟气降温至5℃-15℃,再对温度在5℃-15℃的烟气进行脱硫处理,烟气在5℃-15℃的低温条件下脱硫效率高,因此增大了本公开实施例用于生物质电厂烟气的低温脱硫脱硝方法的脱硫率。对经过降温的烟气进行再次降温,其中将烟气的温度降低至-10℃以下,再对温度在-10℃以下的低温烟气进行脱硝处理,烟气在-10℃以下的低温条件下脱硝效率高,因此增大了本公开实施例用于生物质电厂烟气的低温脱硫脱硝方法的脱硝率。The low-temperature desulfurization and denitrification method for biomass power plant flue gas in the embodiment of the present disclosure lowers the temperature of the flue gas to 5°C-15°C, and then desulfurizes the flue gas at a temperature of 5°C-15°C. The desulfurization efficiency is high under the low temperature condition of 15° C., so the desulfurization rate of the low-temperature desulfurization and denitrification method used in the flue gas of the biomass power plant according to the embodiment of the present disclosure is increased. The cooled flue gas is cooled again, wherein the temperature of the flue gas is lowered to below -10°C, and then the low-temperature flue gas with a temperature below -10°C is subjected to denitrification treatment, and the flue gas is kept at a low temperature below -10°C The denitrification efficiency is high, so the denitrification rate of the low-temperature desulfurization and denitrification method used in the flue gas of the biomass power plant according to the embodiment of the present disclosure is increased.
由此,本公开实施例用于生物质电厂烟气的低温脱硫脱硝方法具有脱硝率高和脱硫率高的优点。Therefore, the low-temperature desulfurization and denitrification method used in the embodiment of the present disclosure for the flue gas of a biomass power plant has the advantages of high denitrification rate and high desulfurization rate.
在一些实施例中,将烟气的温度降到5℃-15℃包括:将烟气通入省煤器7,使烟气的温度降到120℃-150℃。具体地,将生物质锅炉1排出的烟气通过第五烟气出口72进入省煤器7中,烟气在省煤器7中进行降温处理,将温度降至120℃-150℃。In some embodiments, reducing the temperature of the flue gas to 5°C-15°C includes: passing the flue gas into the economizer 7 to reduce the temperature of the flue gas to 120°C-150°C. Specifically, the flue gas discharged from the biomass boiler 1 enters the economizer 7 through the fifth flue gas outlet 72, and the flue gas is subjected to cooling treatment in the economizer 7 to reduce the temperature to 120°C-150°C.
将烟气通入制冷系统2,使烟气的温度降到5℃-15℃。具体地,经过省煤器7降温后的烟气通过第五烟气出口72排出省煤器7,并通过第一烟气进口21进入制冷系统2,烟气在制冷系统2中进行降温处理,将温度降至5℃-15℃。Pass the flue gas into the refrigeration system 2 to lower the temperature of the flue gas to 5°C-15°C. Specifically, the flue gas cooled by the economizer 7 is discharged from the economizer 7 through the fifth flue gas outlet 72, and enters the refrigeration system 2 through the first flue gas inlet 21, and the flue gas is cooled in the refrigeration system 2, Lower the temperature to 5°C-15°C.
可以理解的是,通过将烟气在回冷器9中降温,使烟气温度先达到120℃-150℃,再由制冷系统2将烟气的温度降至5℃-15℃,由此能够避免使用单一设备直接将烟气温度降至5℃-15℃,进而使设备的负荷增大,因此提高了设备的使用寿命。It can be understood that by lowering the temperature of the flue gas in the recooler 9, the temperature of the flue gas first reaches 120°C-150°C, and then the temperature of the flue gas is reduced to 5°C-15°C by the refrigeration system 2, thereby enabling Avoid using a single device to directly reduce the flue gas temperature to 5°C-15°C, which will increase the load on the equipment, thus improving the service life of the equipment.
在一些实施例中,在将烟气通入省煤器7之后,在将烟气通入制冷系统2之前,将烟气通入回冷器9,使烟气的温度降到30℃-60℃。In some embodiments, after the flue gas is passed into the economizer 7, before the flue gas is passed into the refrigeration system 2, the flue gas is passed into the recooler 9 to reduce the temperature of the flue gas to 30°C-60°C ℃.
具体地,经过省煤器7降温后的烟气从第七烟气进口91进入回冷器9中,烟气在回冷器9中进行降温处理,其中回冷器9将烟气的温度降至30℃-60℃。经过回冷器9降温后的烟气从第七烟气出口92排出,再通过第一烟气进口21进入制冷系统2中。Specifically, the flue gas cooled by the economizer 7 enters the recooler 9 from the seventh flue gas inlet 91, and the flue gas is cooled in the recooler 9, wherein the recooler 9 lowers the temperature of the flue gas to to 30°C-60°C. The flue gas cooled by the recooler 9 is discharged from the seventh flue gas outlet 92 , and enters the refrigeration system 2 through the first flue gas inlet 21 .
可以理解的是,将省煤器7排出的烟气在回冷器9中进行降温,使烟气温度达到30℃-60℃,再由制冷系统2将烟气的温度降至5℃-15℃,由此能够避免使用单一设备直接将烟气温度降至5℃-15℃,进而使设备的负荷增大,因此提高了设备的使用寿命。It can be understood that the flue gas discharged from the economizer 7 is cooled in the recooler 9 to make the temperature of the flue gas reach 30°C-60°C, and then the temperature of the flue gas is reduced to 5°C-15°C by the refrigeration system 2. ℃, thereby avoiding the use of a single device to directly reduce the flue gas temperature to 5 ℃ -15 ℃, thereby increasing the load on the equipment, thus improving the service life of the equipment.
在将烟气进行低温脱硝之后,在将烟气排放之前,将烟气通入回冷器9,以对回冷器9进行冷却。After the flue gas is subjected to low-temperature denitrification, before the flue gas is discharged, the flue gas is passed into the recooler 9 to cool the recooler 9 .
具体地,经过第二低温吸附塔5脱硝处理后的烟气从第四烟气出口52排出,并通过低温烟气管道93的第八烟气进口931进入回冷器9中,低温烟气管道93中的低温烟气与回冷器9中的烟气进行换热,进而将回冷器9中烟气的温度降至30℃-60℃,进而对回冷器9进行冷却。Specifically, the flue gas after denitrification treatment in the second low-temperature adsorption tower 5 is discharged from the fourth flue gas outlet 52, and enters the recooler 9 through the eighth flue gas inlet 931 of the low-temperature flue gas pipeline 93, and the low-temperature flue gas pipeline The low-temperature flue gas in 93 exchanges heat with the flue gas in the recooler 9, thereby reducing the temperature of the flue gas in the recooler 9 to 30°C-60°C, and then cooling the recooler 9.
可以理解的是,烟气进行降温时需要耗费能源,利用第二低温吸附塔5处理后的低温烟气(温度为-10℃以下)对回冷器9中的烟气(温度为60℃-90℃)进行降温,使回冷器9中的烟气温度降至30℃-60℃,充分的利用了深冷系统4的烟气降温时所消耗的能源,因此提高了能源的利用率。It can be understood that energy consumption is required when flue gas is cooled, and the flue gas in the recooler 9 (temperature is 60°C- 90°C) to lower the temperature of the flue gas in the recooler 9 to 30°C-60°C, fully utilizing the energy consumed when the flue gas in the cryogenic system 4 cools down, thus improving the utilization rate of energy.
经过回冷器9降温后的烟气通过第一烟气进口21进入制冷系统2中,制冷系统2对烟气进行降温处理,其中经过降温处理后的烟气的温度为5℃-15℃。经过降温的烟气从第一烟气出口22排出制冷系统2。The flue gas cooled by the recooler 9 enters the refrigeration system 2 through the first flue gas inlet 21, and the refrigeration system 2 performs cooling treatment on the flue gas, wherein the temperature of the flue gas after cooling treatment is 5°C-15°C. The cooled flue gas exits the refrigeration system 2 from the first flue gas outlet 22 .
经过制冷系统2降温处理的烟气从第二烟气进口31进入第一低温吸附塔3中,烟气在第一低温吸附塔3中进行脱硫处理。经过第一低温吸附塔3脱硫后的烟气从第二烟气出口32排出第一低温吸附塔3。The flue gas that has been cooled by the refrigeration system 2 enters the first low-temperature adsorption tower 3 from the second flue gas inlet 31 , and the flue gas is desulfurized in the first low-temperature adsorption tower 3 . The flue gas desulfurized by the first low-temperature adsorption tower 3 is discharged from the first low-temperature adsorption tower 3 through the second flue gas outlet 32 .
经过第一低温吸附塔3脱硫处理的烟气从第三烟气进口41进入深冷系统4中,烟气在深冷系统4中再次进行降温处理,其中经过降温处理后的烟气的温度为-10℃以下。经过降温的烟气从第三烟气出口42排出深冷系统4。The flue gas desulfurized by the first low-temperature adsorption tower 3 enters the cryogenic system 4 from the third flue gas inlet 41, and the flue gas is cooled again in the cryogenic system 4, wherein the temperature of the flue gas after the cooling process is Below -10°C. The cooled flue gas exits the cryogenic system 4 from the third flue gas outlet 42 .
经过深冷系统4降温后的烟气从第四烟气进口51进入第二低温吸附塔5中,烟气在第二低温吸附塔5中进行脱硝处理。经过脱硝处理的烟气从第四烟气出口52排出第二低温吸 附塔5。The flue gas cooled by the cryogenic system 4 enters the second cryogenic adsorption tower 5 from the fourth flue gas inlet 51 , and the flue gas is denitrated in the second cryogenic adsorption tower 5 . The flue gas treated by denitrification is discharged from the second low-temperature adsorption tower 5 from the fourth flue gas outlet 52.
经过第二低温吸附塔5脱硝处理后的烟气通过烟筒6的进口61进入烟筒6,烟气从烟筒6的出口62排放到外界。The flue gas after the denitration treatment in the second low-temperature adsorption tower 5 enters the chimney 6 through the inlet 61 of the chimney 6 , and the flue gas is discharged to the outside from the outlet 62 of the chimney 6 .
在一些实施例中,在将烟气通入省煤器7之后,在将烟气通入回冷器9之前,将烟气通入水冷器8,使烟气的温度降到60℃-90℃。In some embodiments, after the flue gas is passed into the economizer 7, before the flue gas is passed into the recooler 9, the flue gas is passed into the water cooler 8 to reduce the temperature of the flue gas to 60°C-90°C. ℃.
具体地,经过省煤器7降温后的烟气从第五烟气出口72排出,通过第六烟气进口81进入水冷器8中。烟气在水冷器8中进行降温处理,其中经过水冷器8降温后的烟气温度在60℃-90℃。经过水冷器8降温后的烟气从第六烟气出口82排出,通过第七烟气进口91进入回冷器9中。Specifically, the flue gas cooled by the economizer 7 is discharged from the fifth flue gas outlet 72 and enters the water cooler 8 through the sixth flue gas inlet 81 . The temperature of the flue gas is lowered in the water cooler 8, wherein the temperature of the flue gas after cooling by the water cooler 8 is between 60°C and 90°C. The flue gas cooled by the water cooler 8 is discharged from the sixth flue gas outlet 82 and enters the recooler 9 through the seventh flue gas inlet 91 .
可以理解的是,通过将烟气在水冷器8中降温,使烟气温度达到60℃-90℃,能够避免使用单一设备直接将烟气温度降至5℃-15℃,进而使设备的负荷增大,因此提高了设备的使用寿命。It can be understood that by cooling the flue gas in the water cooler 8 to make the flue gas temperature reach 60°C-90°C, it is possible to avoid using a single device to directly reduce the flue gas temperature to 5°C-15°C, thereby reducing the load on the device Increased, thus increasing the service life of the equipment.
向水冷器8通入冷却水,以对水冷器8进行冷却。,具体地,将冷却水通入冷却水管道83中,使冷却水通过冷却水管道83与水冷器8中的烟气进行换热,进而将水冷器8中的烟气的温度降到60℃-90℃。Cooling water is passed into the water cooler 8 to cool the water cooler 8 . Specifically, the cooling water is passed into the cooling water pipe 83, and the cooling water passes through the cooling water pipe 83 to exchange heat with the flue gas in the water cooler 8, thereby reducing the temperature of the flue gas in the water cooler 8 to 60°C -90°C.
在一些实施例中,在将烟气通入省煤器7之后,在将烟气通入水冷器8之前,将烟气进行除尘。In some embodiments, after passing the flue gas into the economizer 7 and before passing the flue gas into the water cooler 8 , the flue gas is dedusted.
具体地,经过省煤器7处理后的烟气从第五烟气出口72排出,通过进气口101进入除尘器10中,除尘器10对烟气进行除尘处理,其中除尘器10能够除去烟气中的烟尘,经过除尘后的烟气从除尘器10的出气口102排出,并且从第六烟气进口81进入水冷器8中。其中从烟气中去除的烟尘从除尘器10的出尘口103排出。Specifically, the flue gas processed by the economizer 7 is discharged from the fifth flue gas outlet 72, and enters the dust collector 10 through the air inlet 101, and the dust collector 10 performs dust removal treatment on the flue gas, wherein the dust collector 10 can remove smoke The smoke and dust in the air, the dust-cleaned flue gas is discharged from the gas outlet 102 of the dust collector 10 , and enters the water cooler 8 from the sixth flue gas inlet 81 . The dust removed from the flue gas is discharged from the dust outlet 103 of the dust collector 10 .
可以理解的是,对烟气进行除尘处理,使烟气在排放时不会污染环境,进而达到环保的目的。It is understandable that dust removal treatment is performed on the flue gas so that the flue gas will not pollute the environment when it is discharged, thereby achieving the purpose of environmental protection.
在一些实施例中,将烟气的温度降到-10℃以下包括:将烟气通入深冷系统4,以使烟气的温度降到-10℃以下。In some embodiments, reducing the temperature of the flue gas to below -10°C includes: passing the flue gas into the cryogenic system 4 to reduce the temperature of the flue gas to below -10°C.
具体地,经过脱硫处理的烟气从第三烟气进口41进入深冷系统4中,进一步地,烟气在深冷系统4中再次进行降温处理,其中经过降温处理后的烟气的温度为-10℃以下。经过降温的烟气从第三烟气出口42排出深冷系统4。Specifically, the desulfurized flue gas enters the cryogenic system 4 from the third flue gas inlet 41, and further, the flue gas is subjected to cooling treatment again in the cryogenic system 4, wherein the temperature of the flue gas after the cooling treatment is Below -10°C. The cooled flue gas exits the cryogenic system 4 from the third flue gas outlet 42 .
可以理解的是,烟气在-10℃以下的低温条件下脱硝效率高,将烟气的温度降低至-10℃以下,再对温度在-10℃以下的低温烟气进行脱硫处理,进而增大了本公开实施例用于生物质电厂烟气的低温脱硫脱硝方法的脱硝率。It can be understood that the denitrification efficiency of flue gas is high under low temperature conditions below -10°C, and the temperature of flue gas is lowered to below -10°C, and then the low temperature flue gas with temperature below -10°C is desulfurized, thereby increasing The denitrification rate of the low-temperature desulfurization and denitrification method used in the embodiment of the present disclosure for biomass power plant flue gas is increased.
在本公开的描述中,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公开和简化描述,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公开的限制。In describing the present disclosure, it is to 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 orientations or positional relationships indicated by "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying the referred devices or elements Must be in a particular orientation, constructed, and operate in a particular orientation, and thus should not be construed as limiting on the present disclosure.
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。在本公开的描述中,“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 interpreted 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 disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.
在本公开中,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公开中的具体含义。In this disclosure, 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 defined 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 the present disclosure according to specific situations.
在本公开中,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 disclosure, unless otherwise clearly stated 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.
在本公开中,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公开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 disclosure, the terms "one embodiment," "some embodiments," "example," "specific examples," or "some examples" mean a specific feature, structure, material, or feature described in connection with the embodiment or example. Features are included in at least one embodiment or example of the present disclosure. 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公开的实施例,可以理解的是,上述实施例是示例性的,不能理解为对本公开的限制,本领域的普通技术人员在本公开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 disclosure 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 disclosure, and those skilled in the art can understand the above-mentioned embodiments within the scope of the present disclosure. The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

  1. 一种用于生物质电厂烟气的低温脱硫脱硝方法,其特征在于,包括以下步骤:A method for low-temperature desulfurization and denitrification of flue gas from a biomass power plant, characterized in that it comprises the following steps:
    将烟气的温度降到5℃-15℃;Reduce the temperature of the flue gas to 5°C-15°C;
    将所述烟气进行低温脱硫;performing low-temperature desulfurization on the flue gas;
    将所述烟气的温度降到-10℃以下;Lowering the temperature of the flue gas to below -10°C;
    将所述烟气进行低温脱硝;The flue gas is subjected to low-temperature denitrification;
    将所述烟气排放。The flue gas is discharged.
  2. 根据权利要求1所述的用于生物质电厂烟气的低温脱硫脱硝方法,其特征在于,所述将烟气的温度降到5℃-15℃包括:The low-temperature desulfurization and denitrification method for flue gas from a biomass power plant according to claim 1, wherein said reducing the temperature of the flue gas to 5°C-15°C includes:
    将所述烟气通入省煤器,使所述烟气的温度降到120℃-150℃;Pass the flue gas into the economizer to reduce the temperature of the flue gas to 120°C-150°C;
    将所述烟气通入制冷系统,使所述烟气的温度降到5℃-15℃。The flue gas is passed into a refrigeration system to reduce the temperature of the flue gas to 5°C-15°C.
  3. 根据权利要求2所述的用于生物质电厂烟气的低温脱硫脱硝方法,其特征在于,在所述将所述烟气通入省煤器之后,在所述将所述烟气通入制冷系统之前,将所述烟气通入回冷器,使所述烟气的温度降到30℃-60℃;The low-temperature desulfurization and denitrification method for biomass power plant flue gas according to claim 2, characterized in that, after the flue gas is passed into the economizer, after the flue gas is passed into the refrigeration Before the system, the flue gas is passed into the recooler to reduce the temperature of the flue gas to 30°C-60°C;
    在所述将所述烟气进行低温脱硝之后,在所述将所述烟气排放之前,将所述烟气通入所述回冷器,以对所述回冷器进行冷却。After the low-temperature denitrification of the flue gas, before the discharge of the flue gas, the flue gas is passed into the regenerator to cool the recooler.
  4. 根据权利要求3所述的用于生物质电厂烟气的低温脱硫脱硝方法,其特征在于,在所述将所述烟气通入省煤器之后,在所述将所述烟气通入回冷器之前,将所述烟气通入水冷器,使所述烟气的温度降到60℃-90℃;The low-temperature desulfurization and denitrification method for biomass power plant flue gas according to claim 3, characterized in that, after said passing said flue gas into the economizer, said passing said flue gas back into the Before the cooler, pass the flue gas into the water cooler to reduce the temperature of the flue gas to 60°C-90°C;
    向所述水冷器通入冷却水,以对所述水冷器进行冷却。Cooling water is fed into the water cooler to cool the water cooler.
  5. 根据权利要求4所述的用于生物质电厂烟气的低温脱硫脱硝方法,其特征在于,在所述将所述烟气通入省煤器之后,在所述将所述烟气通入水冷器之前,将所述烟气进行除尘。The low-temperature desulfurization and denitrification method for biomass power plant flue gas according to claim 4, characterized in that, after the flue gas is passed into the economizer, after the flue gas is passed into the water-cooled Before the device, the flue gas is dedusted.
  6. 根据权利要求1-5中任一项所述的用于生物质电厂烟气的低温脱硫脱硝方法,其特征在于,所述将所述烟气的温度降到-10℃以下包括:将所述烟气通入深冷系统,以使所述烟气的温度降到-10℃以下。The low-temperature desulfurization and denitrification method for biomass power plant flue gas according to any one of claims 1-5, wherein said reducing the temperature of said flue gas to below -10°C comprises: The flue gas is passed into a cryogenic system to reduce the temperature of the flue gas to below -10°C.
  7. 一种用于生物质电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 flue gas from a biomass power plant, characterized in that it includes:
    生物质锅炉,所述生物质锅炉包括烟气排放口;A biomass boiler comprising a flue gas discharge port;
    制冷系统,所述制冷系统包括第一烟气进口和第一烟气出口,所述烟气排放口与所述第一烟气进口连通,以便将烟气通入所述制冷系统内,从而将所述烟气的温度降到5℃-15℃;A refrigeration system, the refrigeration system 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 the flue gas into the refrigeration system, so that the The temperature of the flue gas drops to 5°C-15°C;
    第一低温吸附塔,所述第一低温吸附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第一低温吸附塔内,从而对所述烟气进行脱硫;The first low-temperature adsorption tower, the first low-temperature adsorption tower includes a second flue gas inlet and a second flue gas outlet, and the first flue gas outlet communicates with the second flue gas inlet so that the flue gas can be ventilated into the first low-temperature adsorption tower, thereby desulfurizing the flue gas;
    深冷系统,所述深冷系统包括第三烟气进口和第三烟气出口,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深冷系统内,从而将所述烟气的温度降到-10℃以下;A cryogenic system, the cryogenic system includes a third flue gas inlet and a third flue gas outlet, and the second flue gas outlet communicates with the third flue gas inlet so as to pass the flue gas into the deep In the cold system, thereby reducing the temperature of the flue gas to below -10°C;
    第二低温吸附塔,所述第二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第二低温吸附塔内,从而对所述烟气进行脱硝;和The second low-temperature adsorption tower, the second 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 into the second low-temperature adsorption tower, thereby denitrifying the flue gas; and
    烟筒,所述烟筒的进口与所述第四烟气出口连通,以便排放所述烟气。A chimney, the inlet of the chimney communicates with the fourth flue gas outlet so as to discharge the flue gas.
  8. 根据权利要求7所述的用于生物质电厂烟气的低温脱硫脱硝系统,其特征在于,还包括省煤器,所述省煤器包括第五烟气进口和第五烟气出口,所述烟气排放口与所述第五烟气进口连通,以便将所述烟气通入所述省煤器内,从而使所述烟气的温度降到120℃-150℃,The low-temperature desulfurization and denitrification system for biomass power plant flue gas according to claim 7, characterized in that it also includes an economizer, the economizer includes a fifth flue gas inlet and a fifth flue gas outlet, said The flue gas discharge port communicates with the fifth flue gas inlet, so that the flue gas can be passed into the economizer, thereby reducing the temperature of the flue gas to 120°C-150°C,
    所述第五烟气出口与所述第一烟气进口连通,以使所述烟气排放口与所述第一烟气进口连通。The fifth smoke outlet communicates with the first smoke inlet, so that the smoke discharge port communicates with the first smoke inlet.
  9. 根据权利要求8所述的用于生物质电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,所述第五烟气出口与所述第六烟气进口连通,以便将所述烟气通入所述水冷器内,从而使所述烟气的温度降到60℃-90℃,The low-temperature desulfurization and denitrification system for biomass power plant flue gas according to claim 8, further comprising a water cooler, the water cooler includes a sixth flue gas inlet and a sixth flue gas outlet, and the fifth The flue gas outlet communicates with the sixth flue gas inlet, so that the flue gas is passed into the water cooler, thereby reducing the temperature of the flue gas to 60°C-90°C,
    所述第六烟气出口与所述第一烟气进口连通,以使所述第五烟气出口与所述第一烟气进口连通。The sixth flue gas outlet communicates with the first flue gas inlet, so that the fifth flue gas outlet communicates with the first flue gas inlet.
  10. 根据权利要求9所述的用于生物质电厂烟气的低温脱硫脱硝系统,其特征在于,还包括回冷器,所述回冷器包括第七烟气进口和第七烟气出口,所述第六烟气出口与所述第七烟气进口连通,以便将所述烟气通入所述回冷器内,从而使所述烟气的温度降到30℃-60℃,The low-temperature desulfurization and denitrification system for biomass power plant flue gas according to claim 9, characterized in that it also includes a recooler, the recooler includes a seventh flue gas inlet and a seventh flue gas outlet, the The sixth flue gas outlet communicates with the seventh flue gas inlet so as to pass the flue gas into the recooler, thereby reducing the temperature of the flue gas to 30°C-60°C,
    所述第七烟气出口与所述第一烟气进口连通,以使所述第六烟气出口与所述第一烟气进口连通。The seventh flue gas outlet communicates with the first flue gas inlet, so that the sixth flue gas outlet communicates with the first flue gas inlet.
PCT/CN2022/078041 2021-09-28 2022-02-25 Low-temperature desulfurization and denitrification method and system for flue gas from biomass power plant WO2023050699A1 (en)

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