WO2023050895A1 - 用于钢厂烧结机烟气的低温脱硫脱硝系统 - Google Patents

用于钢厂烧结机烟气的低温脱硫脱硝系统 Download PDF

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WO2023050895A1
WO2023050895A1 PCT/CN2022/099160 CN2022099160W WO2023050895A1 WO 2023050895 A1 WO2023050895 A1 WO 2023050895A1 CN 2022099160 W CN2022099160 W CN 2022099160W WO 2023050895 A1 WO2023050895 A1 WO 2023050895A1
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flue gas
adsorbent
discharge port
low
sintering machine
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PCT/CN2022/099160
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English (en)
French (fr)
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汪世清
李卫东
王兴俊
肖平
许世森
郜时旺
刘练波
牛红伟
谢燮林
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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 WO2023050895A1 publication Critical patent/WO2023050895A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/06—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/34—Regenerating or reactivating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases

Definitions

  • the present application relates to the technical field of flue gas treatment, and in particular, relates to a low-temperature desulfurization and denitrification system for flue gas of sintering machines in steel mills.
  • the iron and steel industry plays an important role in my country's national economy and is also a major pollutant discharger.
  • the sintering process is one of the links that cause serious pollution.
  • the pollutants produced by the sintering process are mainly flue gas including dust and acid gaseous pollutants such as SOx and NOx .
  • the flue gas generated by the sintering process is denitrated by the SCR denitrification process.
  • the temperature of the flue gas generated by the sintering process is 120°C-180°C.
  • the SCR denitrification process also needs to heat up the flue gas through combustion, which is likely to cause secondary pollution, and the denitrification efficiency is low.
  • This application aims to solve one of the technical problems in the related art at least to a certain extent.
  • the embodiment of the application proposes a low-temperature desulfurization and denitrification system for flue gas of sintering machines in steel mills.
  • the system performs desulfurization and denitrification, it does not need to heat the flue gas and has high denitrification efficiency.
  • a sintering machine including a flue gas discharge port
  • a cooling system the cooling system includes a first flue gas inlet and a first flue gas outlet, the flue gas discharge port communicates with the first flue gas inlet, so as to pass the flue gas into the cooling system, thereby The temperature of the flue gas drops below 20°C;
  • An adsorption tower the adsorption tower includes a first feed port, a first discharge port, 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 Pass the flue gas into the adsorption tower to desulfurize and denitrify the flue gas, the first feed port is used to add adsorbent to the adsorption tower, and the first discharge port Used to discharge the adsorbent in the adsorption tower;
  • a regeneration tower the regeneration tower includes an acid gas outlet, a second feed port and a second discharge port, the second feed port is used to add the adsorbed gas discharged from the first feed port into the regeneration tower agent, the second discharge port is used to discharge the adsorbent in the regeneration tower, and the regeneration tower also includes a heating pipeline, and the heating pipeline is used to heat the adsorbent in the regeneration tower, so that the The adsorbent in the regeneration tower releases acid gas, and the acid gas outlet is used to discharge the acid gas.
  • the temperature of the flue gas can be lowered to below 20°C, and then it can be adsorbed by the adsorption tower, so that the flue gas can be desulfurized and denitrified without The flue gas needs to be heated, and the denitrification efficiency is high.
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in steel mills can also heat the adsorbent through the regeneration tower to produce acid gas, and the adsorbent can be recycled.
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in a steel plant further includes a precooler, the precooler includes a third inlet and a third outlet, and the third inlet
  • the feed port is used to add the adsorbent discharged from the second discharge port into the pre-cooler, and the third discharge port is used to discharge the adsorbent in the pre-cooler, and the pre-cooler also
  • a cooling pipeline is included, and the cooling pipeline is used for feeding cooling gas so as to cool the adsorbent in the precooler.
  • the cooling pipeline includes a third flue gas inlet and a third flue gas outlet, and the third flue gas inlet communicates with the second flue gas outlet so that the flue gas in the adsorption tower can be ventilated.
  • the flue gas forms the cooling gas.
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in a steel plant further includes a first delivery device, and the first delivery device is used to deliver the adsorbent discharged from the first discharge port to The second feed port of the regeneration tower is used to feed the adsorbent discharged from the first feed port into the regeneration tower.
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in steel mills further includes a second conveying device and a third conveying device, the second conveying device is used to discharge the second discharge port The adsorbent is transported to the third inlet of the precooler, so that the adsorbent discharged from the second outlet is added to the precooler,
  • the third conveying device is used to transport the adsorbent discharged from the third discharge port to the first feed port of the adsorption tower, so as to add the third discharge port to the adsorption tower discharged adsorbent.
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in a steel plant further includes a dust collector, the dust collector includes an air inlet and an air outlet, and the air inlet of the dust collector is connected to the flue gas
  • the gas discharge port is connected so that the flue gas is passed into the dust collector, and the gas outlet of the dust collector is connected with the first flue gas inlet so that the flue gas discharge port is connected to the first flue gas Import connection.
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in a steel plant further includes a first induced draft fan, the first induced draft fan is arranged between the cooling system and the dust collector, the The air inlet of the first induced draft fan communicates with the air outlet of the dust collector, and the air outlet of the first induced draft fan communicates with the first flue gas inlet, so that the first flue gas inlet is connected with the dust collector The air outlet is connected.
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in steel mills further includes a second induced draft fan, the air inlet of the second induced draft fan communicates with the acid gas outlet, so as to discharge the acid gas out.
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in a steel plant further includes a chimney, and the inlet of the chimney communicates with the third flue gas outlet of the precooler so as to discharge the smoke.
  • Fig. 1 is a schematic diagram of a low-temperature desulfurization and denitrification system for sintering machine flue gas in a steel plant according to an embodiment of the present application.
  • Fig. 2 is a schematic diagram of a low-temperature desulfurization and denitrification system for sintering machine flue gas in a steel plant according to an embodiment of the present application.
  • Cooling system 2 first flue gas inlet 201; first flue gas outlet 202;
  • Adsorption tower 3 first feed port 301; first discharge port 302; second flue gas inlet 303; second flue gas outlet 304;
  • Regeneration tower 4 second feed port 401; second discharge port 402; acid gas outlet 403; hot gas inlet 404; hot gas outlet 405;
  • Precooler 5 third material inlet 501; third material outlet 502; third flue gas inlet 503; third flue gas outlet 504;
  • the first induced draft fan 91 The first induced draft fan 91;
  • the second induced draft fan 92 The second induced draft fan 92.
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in a steel plant includes a sintering machine 1 , a cooling system 2 , an adsorption tower 3 and a regeneration tower 4 .
  • the sintering machine 1 includes a flue gas discharge port 101
  • the cooling system 2 includes a first flue gas inlet 201 and a first flue gas outlet 202
  • the flue gas discharge port 101 communicates with the first flue gas inlet 201 . Therefore, the low-temperature desulfurization and denitrification system for the flue gas of the sintering machine of the steel plant in the embodiment of the present application can pass the flue gas into the cooling system 2, thereby reducing the temperature of the flue gas to below 20°C.
  • the temperature of the flue gas discharged from the sintering machine 1 is 120°C-180°C, so the flue gas discharged from the sintering machine 1 needs to enter the cooling system 2 through the first flue gas inlet 201 to cool down, which is beneficial to improve the adsorption tower 3 the adsorption efficiency.
  • the temperature of the flue gas discharged from the first flue gas outlet 202 of the cooling system 2 is -5°C-5°C.
  • the temperature of the flue gas discharged from the first flue gas outlet 202 of the cooling system 2 is 0°C.
  • the adsorption tower 3 includes a first feed inlet 301 , a first feed outlet 302 , a second flue gas inlet 303 and a second flue gas outlet 304 .
  • the first flue gas outlet 202 communicates with the second flue gas inlet 303, so the flue gas discharged from the first flue gas outlet 202 of the cooling system 2 can be passed into the adsorption tower 3, thereby desulfurizing and denitrifying the flue gas.
  • the adsorbent has a high adsorption efficiency for low-temperature flue gas with a temperature below 20° C., thereby improving the desulfurization and denitrification efficiency of the flue gas.
  • the adsorbent in the adsorption tower 3 can be activated carbon, of course, it can also be other adsorbents capable of adsorbing acidic gaseous pollutants.
  • the regeneration tower 4 includes a heating pipe, an acid gas outlet 403 , a second feed port 401 and a second feed port 402 .
  • the first feed port 301 is used to add adsorbent into the adsorption tower 3
  • the first discharge port 302 is used to discharge the adsorbent in the adsorption tower 3 .
  • the second feed port 401 is used to add the adsorbent discharged from the first feed port 302 into the regeneration tower 4
  • the second feed port 402 is used to discharge the adsorbent from the regeneration tower 4 .
  • the heating pipe is used to heat the adsorbent in the regeneration tower 4, so the adsorbent in the regeneration tower 4 releases acid gas, and the acid gas outlet 403 is used to discharge the acid gas.
  • the heating pipeline includes a hot gas inlet 404 and a hot gas outlet 405.
  • the heating pipeline can be fed with high-temperature steam.
  • the high-temperature steam enters the heating pipeline from the hot gas inlet 404.
  • the high-temperature steam exchanges heat with the adsorbent in the regeneration tower 4, thereby making the The temperature rises, and then the high-temperature steam is discharged from the hot gas outlet 405 .
  • the regeneration tower 4 can heat the adsorbent in the adsorption tower 3, so that the acidic gaseous pollutants adsorbed by the adsorbent are released, so as to be used to prepare acid gas, and the adsorbent after releasing the acidic gaseous pollutants can be recycled. Used to adsorb acidic gaseous pollutants.
  • the temperature of the flue gas can be lowered to below 20°C, and then adsorbed by the adsorption tower 3, so that the flue gas can be desulfurized and denitrified. There is no need to heat the flue gas, and the denitrification efficiency is high.
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in steel mills can also heat the adsorbent through the regeneration tower 4 to produce acid gas, and the adsorbent can be recycled.
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in a steel plant further includes a first transport device 61, and the first transport device 61 can move the first discharge port
  • the adsorbent discharged from 302 is transported to the second feed port 401 of the regeneration tower 4 , so that the adsorbent discharged from the first discharge port 302 is added into the regeneration tower 4 .
  • the first conveying device 61 can transport the adsorbent discharged from the adsorption tower 3 to the regeneration tower 4, and release the acid gas adsorbed by the adsorbent to prepare acid gas, so that the adsorbent can be recycled.
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in the embodiment of the present application further includes a precooler 5 .
  • the precooler 5 includes a cooling pipeline, a third feed port 501 and a third discharge port 502 .
  • the third feed port 501 is used to add the adsorbent discharged from the second discharge port 402 into the precooler 5
  • the third discharge port 502 is used to discharge the adsorbent in the precooler 5
  • the cooling pipeline is used to feed The cooling gas can cool the adsorbent in the precooler 5 .
  • the material discharged from the second discharge port 402 of the regeneration tower 4 can be added in the precooler 5 through the third feed port 501
  • the cooling pipeline includes a third flue gas inlet 503 and a third flue gas outlet 504, and the third flue gas inlet 503 communicates with the second flue gas outlet 304, so the adsorption tower
  • the flue gas in 3 can pass into the cooling pipe, and the flue gas forms cooling gas, thereby cooling the adsorbent in the precooler 5 .
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in the embodiment of the present application further includes a second conveying device 62 and a third conveying device 63.
  • the second conveying device 62 uses The adsorbent discharged from the second discharge port 402 is transported to the third feed port 501 of the precooler 5 so as to add the adsorbent discharged from the second discharge port 402 into the precooler 5 .
  • the third delivery device 63 is used to transport the adsorbent discharged from the third discharge port 502 to the first feed port 301 of the adsorption tower 3, so as to add the adsorbent discharged from the third discharge port 502 into the adsorption tower 3 .
  • the first conveying device 61 can convey the adsorbent discharged from the adsorption tower 3 to the regeneration tower 4, the second conveying device 62 can convey the adsorbent discharged from the regeneration tower 4 to the precooler 5 for cooling, and the third conveying device 63 again
  • the adsorbent discharged from the precooler 5 can be transported to the adsorption tower 3, so that the adsorbent can be recycled.
  • first conveying device 61 the second conveying device 62 and the third conveying device 63 may be excavators, loaders or other devices capable of conveying materials.
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in a steel plant further includes a dust collector 8 .
  • the dust collector 8 includes an air inlet and an air outlet, and the air inlet of the dust collector 8 is communicated with the flue gas discharge port 101, so that the flue gas is passed into the dust collector 8, and the gas outlet of the dust collector 8 is communicated with the first flue gas inlet 201 , so that the flue gas discharge port 101 communicates with the first flue gas inlet 201 .
  • the dust collector 8 can filter the dust in the flue gas, so that the dust content in the flue gas can reach the standard of 10mg/m3.
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in the embodiment of the present application further includes a first induced draft fan 91 and a second induced draft fan 92 .
  • the first induced draft fan 91 is arranged between the cooling system 2 and the dust collector 8, the air inlet of the first induced draft fan 91 communicates with the air outlet of the dust collector 8, and the air outlet of the first induced draft fan 91 communicates with the first flue gas inlet 201 , so that the first flue gas inlet 201 communicates with the gas outlet of the dust collector 8 .
  • the first induced draft fan 91 can discharge the flue gas from the air outlet of the dust collector 8 into the cooling system 2 .
  • the air inlet of the second induced draft fan 92 communicates with the acid gas outlet 403 , so the second induced draft fan 92 can discharge the acid gas from the acid gas outlet 403 .
  • the low-temperature desulfurization and denitrification system for sintering machine flue gas in the embodiment of the present application also includes a chimney 7, the inlet of the chimney 7 communicates with the third flue gas outlet 504 of the precooler 5, so the Smoke emission.
  • the following describes the destocking method of the low-temperature desulfurization and denitrification system for the flue gas of the sintering machine in the steel plant according to the embodiment of the present application.
  • the method is realized by relying on the low-temperature desulfurization and denitrification system for sintering machine flue gas of the above-mentioned embodiment.
  • the flue gas is passed into the adsorption tower 3 for desulfurization and denitrification;
  • the cooling system 2 lowers the temperature of the flue gas to -5°C-5°C, that is, the temperature of the flue gas is greater than or equal to -5°C and less than or equal to 5°C.
  • the low-temperature desulfurization and denitrification system used for flue gas from sintering machines in steel mills in the embodiment of the present application lowers the temperature of the flue gas to below 20°C, and then adsorbs it through the adsorption tower 3, thereby desulfurizing and denitrifying the flue gas.
  • the low-temperature desulfurization and denitrification system for the flue gas of the sintering machine in the steel plant does not need to heat the flue gas, and has high denitrification efficiency.
  • the adsorbent in the adsorption tower 3 is discharged;
  • the discharged adsorbent is sent to regeneration tower 4 to make acid gas.
  • the adsorbent in the adsorption tower 3 is discharged, and the discharged adsorbent is transported to the regeneration tower 4, and the adsorbent is heated through the regeneration tower 4, so that the adsorbent releases the adsorbed acid gas, thereby being used to prepare acid gas.
  • the adsorbent is used to prepare acid gas, so that the adsorbent can be recycled.
  • the adsorbent in the regeneration tower 4 is discharged
  • the adsorbent is sent to the adsorption tower 3.
  • the adsorbent in the regeneration tower 4 is discharged, and the discharged adsorbent is cold-sent into the pre-cooler 5, and the cooling gas is passed into the pre-cooler 5, and the cooling gas can cool the pre-cooler 5, thereby cooling the pre-cooler.
  • the adsorbent in the device 5 is cooled, and then the adsorbent is sent to the adsorption tower 3. Therefore, the adsorbent can be recycled.
  • the flue gas after passing the flue gas into the adsorption tower 3 for desulfurization and denitrification, before discharging the flue gas, the flue gas is passed into the precooler 5 to form the flue gas into cooling gas. Therefore, the cooling capacity of the flue gas can be fully utilized, and no additional refrigeration is required to cool the precooler 5 .
  • first and second are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features.
  • the features defined as “first” and “second” may explicitly or implicitly include at least one of these features.
  • “plurality” means at least two, such as two, three, etc., unless otherwise specifically defined.
  • a first feature being "on” or “under” a second feature may mean that the first and second features are in direct contact, or that the first and second features are indirect through an intermediary. touch.
  • “above”, “above” and “above” the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
  • “Below”, “beneath” and “beneath” the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.
  • the terms “one embodiment,” “some embodiments,” “example,” “specific examples,” or “some examples” mean specific features, structures, materials, or features described in connection with the embodiment or examples. Features are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

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Abstract

本申请公开了一种用于钢厂烧结机烟气的低温脱硫脱硝系统，包括烧结机、冷却系统、吸附塔和再生塔。烟气排放口与第一烟气进口连通，以便将烟气通入冷却系统内，从而将烟气的温度降到20℃以下；第一烟气出口与第二烟气进口连通，以便将烟气通入吸附塔内，从而对烟气进行脱硫、脱硝，第一进料口用于向吸附塔内加入吸附剂，第一出料口用于排出吸附塔内的吸附剂；第二进料口用于向再生塔内加入第一出料口排出的吸附剂，第二出料口用于排出再生塔内的吸附剂，再生塔还包括加热管道，酸气出口用于排出酸气。本申请的用于钢厂烧结机烟气的低温脱硫脱硝系统不需要对烟气加热，而且脱硝效率高。

Description

用于钢厂烧结机烟气的低温脱硫脱硝系统
交叉引用
本申请要求在2021年9月28日提交中国国家知识产权局、申请号为202122371226.0、发明名称为“用于钢厂烧结机烟气的低温脱硫脱硝系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及烟气处理技术领域，具体地，涉及一种用于钢厂烧结机烟气的低温脱硫脱硝系统。
背景技术
钢铁工业在我国国民经济中扮演着重要角色，同时也是排污大户，在钢铁企业的生产过程中，烧结工艺是造成污染较为严重的环节之一。烧结工艺产生的污染物主要为包括粉尘和SO x、NO x等酸性气态污染物的烟气。
相关技术中，烧结工艺产生的烟气通过SCR脱硝工艺进行脱硝，烧结工艺产生的烟气温度为120℃-180℃，采用SCR脱硝工艺还需要将通过燃烧起将烟气升温，容易造成二次污染，而且脱硝效率较低。
发明内容
本申请旨在至少在一定程度上解决相关技术中的技术问题之一。
为此，本申请的实施例提出一种用于钢厂烧结机烟气的低温脱硫脱硝系统，该系统进行脱硫、脱硝时，不需要对烟气加热，而且脱硝效率高。
根据本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统，包括：
烧结机，所述烧结机包括烟气排放口；
冷却系统，所述冷却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冷却系统内，从而将烟气的温度降到20℃以下；
吸附塔，所述吸附塔包括第一进料口、第一出料口和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吸附塔内，从而对所述烟气进行脱硫、脱硝，所述第一进料口用于向所述吸附塔内加入吸附剂，所述第一出料口用于排出所述吸附塔内的吸附剂；
再生塔，所述再生塔包括酸气出口、第二进料口和第二出料口，所述第二进料口用于向所述再生塔内加入所述第一出料口排出的吸附剂，所述第二出料口用于排出所述再生塔 内的吸附剂，所述再生塔还包括加热管道，所述加热管道用于加热所述再生塔内的吸附剂，从而使所述再生塔内的吸附剂释放酸气，所述酸气出口用于排出所述酸气。
根据本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统，能够将烟气的温度降到20℃以下，再通过吸附塔进行吸附，从而将对烟气进行脱硫、脱硝，不需要对烟气加热，而且脱硝效率高。
此外，根据本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统还能够通过再生塔将吸附剂加热，从而制备酸气，能够将吸附剂循环利用。
在一些实施例中，所述用于钢厂烧结机烟气的低温脱硫脱硝系统还包括预冷器，所述预冷器包括第三进料口和第三出料口，所述第三进料口用于向所述预冷器内加入所述第二出料口排出的吸附剂，所述第三出料口用于排出所述预冷器内的吸附剂，所述预冷器还包括冷却管道，所述冷却管道用于通入冷却气体，以便冷却预冷器内的吸附剂。
在一些实施例中，所述冷却管道包括第三烟气进口和第三烟气出口，所述第三烟气进口与所述第二烟气出口连通，以便所述吸附塔内的烟气通入所述冷却管道，所述烟气形成所述冷却气体。
在一些实施例中，所述用于钢厂烧结机烟气的低温脱硫脱硝系统还包括第一运送装置，所述第一运送装置用于将所述第一出料口排出的吸附剂运送到所述再生塔的所述第二进料口，以便向所述再生塔内加入所述第一出料口排出的吸附剂。
在一些实施例中，所述用于钢厂烧结机烟气的低温脱硫脱硝系统还包括第二运送装置和第三运送装置，所述第二运送装置用于将所述第二出料口排出的吸附剂运送到所述预冷器的所述第三进料口，以便向所述预冷器内加入所述第二出料口排出的吸附剂，
所述第三运送装置用于将所述第三出料口排出的吸附剂运送到所述吸附塔的所述第一进料口，以便向所述吸附塔内加入所述第三出料口排出的吸附剂。
在一些实施例中，所述用于钢厂烧结机烟气的低温脱硫脱硝系统还包括除尘器，所述除尘器包括进气口和出气口，所述除尘器的进气口与所述烟气排放口连通，以便将所述烟气通入所述除尘器，所述除尘器的出气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。
在一些实施例中，所述用于钢厂烧结机烟气的低温脱硫脱硝系统还包括第一引风机，所述第一引风机设在所述冷却系统和所述除尘器之间，所述第一引风机的进风口与所述除尘器的出气口连通，所述第一引风机的出风口与所述第一烟气进口连通，从而使所述第一烟气进口与所述除尘器的出气口连通。
在一些实施例中，所述用于钢厂烧结机烟气的低温脱硫脱硝系统还包括第二引风机，所述第二引风机的进风口与所述酸气出口连通，以便将所述酸气排出。
在一些实施例中，所述用于钢厂烧结机烟气的低温脱硫脱硝系统还包括烟筒，所述烟筒的进口与所述预冷器的所述第三烟气出口连通，以便排放所述烟气。
附图说明
图1是本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统的示意图。
图2是本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统的示意图。
附图标记：
烧结机1；烟气排放口101；
冷却系统2；第一烟气进口201；第一烟气出口202；
吸附塔3；第一进料口301；第一出料口302；第二烟气进口303；第二烟气出口304；
再生塔4；第二进料口401；第二出料口402；酸气出口403；热气进口404；热气出口405；
预冷器5；第三进料口501；第三出料口502；第三烟气进口503；第三烟气出口504；
第一运送装置61；第二运送装置62；第三运送装置63；
烟筒7；
除尘器8；
第一引风机91；
第二引风机92。
具体实施方式
下面详细描述本申请的实施例，所述实施例的示例在附图中示出。下面通过参考附图描述的实施例是示例性的，旨在用于解释本申请，而不能理解为对本申请的限制。
下面参考附图描述本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统。
如图1所示，根据本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统包括烧结机1、冷却系统2、吸附塔3和再生塔4。
烧结机1包括烟气排放口101，冷却系统2包括第一烟气进口201和第一烟气出口202，烟气排放口101与第一烟气进口201连通。因此本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统能将烟气通入冷却系统2内，从而将烟气的温度降到20℃以下。
可以理解的是，烧结机1排放的烟气温度为120℃-180℃，因此需要将烧结机1排放的烟气通过第一烟气进口201进入冷却系统2降温，从而有利于提高吸附塔3的吸附效率。
具体地，冷却系统2的第一烟气出口202排出的烟气温度为-5℃-5℃。可选地，冷却系统2的第一烟气出口202排出的烟气温度为0℃。
吸附塔3包括第一进料口301、第一出料口302和第二烟气进口303和第二烟气出口304。第一烟气出口202与第二烟气进口303连通，因此能够将冷却系统2的第一烟气出口 202排出的烟气通入吸附塔3内，从而对烟气进行脱硫、脱硝。
可以理解的是，吸附塔3内具有吸附剂，吸附剂对温度在20℃以下的低温烟气的吸附效率高，从而能够提高烟气的脱硫、脱硝效率。
具体地，吸附塔3内的吸附剂可以为活性炭，当然，也可以为其它能够吸附酸性气态污染物的吸附剂。
再生塔4包括加热管道、酸气出口403、第二进料口401和第二出料口402。第一进料口301用于向吸附塔3内加入吸附剂，第一出料口302用于排出吸附塔3内的吸附剂。第二进料口401用于向再生塔4内加入第一出料口302排出的吸附剂，第二出料口402用于排出再生塔4内的吸附剂。加热管道用于加热再生塔4内的吸附剂，因此再生塔4内的吸附剂释放酸气，酸气出口403用于排出酸气。
具体地，加热管道包括热气进口404和热气出口405，加热管道能够通入高温蒸汽，高温蒸汽从热气进口404进入加热管道，高温蒸汽与再生塔4内的吸附剂换热，从而使吸附剂的温度升高，然后高温蒸汽从热气出口405排出。
也就是说，再生塔4能够将吸附塔3内的吸附剂加热，使吸附剂吸附的酸性气态污染物释放，从而用于制备酸气，释放酸性气态污染物后的吸附剂能够循环利用，再用于吸附酸性气态污染物。
根据本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统，能够将烟气的温度降到20℃以下，再通过吸附塔3进行吸附，从而将对烟气进行脱硫、脱硝，不需要对烟气加热，而且脱硝效率高。
此外，根据本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统还能够通过再生塔4将吸附剂加热，从而制备酸气，能够将吸附剂循环利用。
在一些实施例中，如图2所示，本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统还包括第一运送装置61，第一运送装置61能够将第一出料口302排出的吸附剂运送到再生塔4的第二进料口401，从而向再生塔4内加入第一出料口302排出的吸附剂。
因此，第一运送装置61能够将吸附塔3排出的吸附剂运送到再生塔4，将吸附剂吸附的酸性气体释放用于制备酸气，从而能够将吸附剂循环利用。
在一些实施例中，本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统还包括预冷器5。
预冷器5包括冷却管道、第三进料口501和第三出料口502。第三进料口501用于向预冷器5内加入第二出料口402排出的吸附剂，第三出料口502用于排出预冷器5内的吸附剂，冷却管道用于通入冷却气体，冷却气体能冷却预冷器5内的吸附剂。
也就是说，从再生塔4的第二出料口402排出的物料能够通过第三进料口501加入到 预冷器5中
在一些实施例中，如图1和图2所示，冷却管道包括第三烟气进口503和第三烟气出口504，第三烟气进口503与第二烟气出口304连通，因此吸附塔3内的烟气能够通入冷却管道，烟气形成冷却气体，从而对预冷器5内的吸附剂进行冷却。
在一些实施例中，如图2所示，本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统还包括第二运送装置62和第三运送装置63，第二运送装置62用于将第二出料口402排出的吸附剂运送到预冷器5的第三进料口501，以便向预冷器5内加入第二出料口402排出的吸附剂。第三运送装置63用于将第三出料口502排出的吸附剂运送到吸附塔3的第一进料口301，以便向吸附塔3内加入所述第三出料口502排出的吸附剂。
因此，第一运送装置61能够将吸附塔3排出的吸附剂运送到再生塔4，第二运送装置62能够将再生塔4排出的吸附剂运送到预冷器5冷却，第三运送装置63又能够将预冷器5排出的吸附剂运送到吸附塔3，从而能够将吸附剂循环利用。
可以理解的是，第一运送装置61、第二运送装置62和第三运送装置63可以为挖掘机、装载机或者其它能够运送物料的装置。
在一些实施例中，如图2所示，本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统还包括除尘器8。除尘器8包括进气口和出气口，除尘器8的进气口与烟气排放口101连通，以便将烟气通入除尘器8，除尘器8的出气口与第一烟气进口201连通，以使烟气排放口101与第一烟气进口201连通。
因此，除尘器8能够将烟气中的粉尘过滤，使烟气中的粉尘含量达到10mg/m3的标准。
在一些实施例中，如图2所示，本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统还包括第一引风机91和第二引风机92。第一引风机91设在冷却系统2和除尘器8之间，第一引风机91的进风口与除尘器8的出气口连通，第一引风机91的出风口与第一烟气进口201连通，从而使第一烟气进口201与除尘器8的出气口连通。
因此，第一引风机91能够将除尘器8的出气口的烟气排出到冷却系统2中。
第二引风机92的进风口与酸气出口403连通，因此，第二引风机92能够就爱那个酸气出口403的酸气排出。
如图2所示，本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统还包括烟筒7，烟筒7的进口与预冷器5的第三烟气出口504连通，因此能够将烟气排放。
下面描述本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统的脱销方法。该方法依靠上述实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统实现。
本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统的脱销方法包括以下步骤：
将烟气进行除尘；
将烟气的温度降到20℃以下；
将烟气通入吸附塔3进行脱硫、脱硝；
将烟气排放。
具体地，利用除尘器8对烟气进行除尘，再利用冷却系统2将烟气的温度降到20℃以下，然后将烟气吸附塔3进行脱硫、脱硝，最后将烟气排放。
可选地，冷却系统2将烟气的温度降到-5℃-5℃，即烟气的温度大于等于-5℃，且小于等于5℃。
本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统脱硝时，将烟气的温度降到20℃以下，然后通过吸附塔3进行吸附，从而将对烟气进行脱硫、脱硝。
由此，根据本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统不需要对烟气加热，而且脱硝效率高。
在一些实施例中，在将烟气通入吸附塔3进行脱硫、脱硝之后，
将吸附塔3中的吸附剂排出；
将排出的吸附剂送入再生塔4制酸气。
具体地，将吸附塔3中的吸附剂排出，并将排出的吸附剂运送到再生塔4，通过再生塔4对吸附剂进行加热，使吸附剂将吸附的酸性气体释放，从而用于制备酸气。
因此，本申请实施例的用于钢厂烧结机烟气的低温脱硫脱硝系统脱硝时，利用吸附剂制备酸气，从而能够将吸附剂循环利用。
在一些实施例中，在将排出的吸附剂送入再生塔4制酸气之后，
将再生塔4中的吸附剂排出；
将排出的吸附剂冷却；
将吸附剂送入吸附塔3中。
具体地，将再生塔4中的吸附剂排出，将排出的吸附剂冷送入预冷器5中，向预冷器5通入冷却气体，冷却气体能够冷却预冷器5，从而对预冷器5中的吸附剂进行冷却，然后将吸附剂送入吸附塔3中。因此，能够将吸附剂进行循环利用。
可以理解的是，在将烟气通入吸附塔3进行脱硫、脱硝之后，在将烟气排放之前，将烟气通入预冷器5中，使烟气形成冷却气体。因此，能够充分利用烟气的冷量，不必再额外制冷，对预冷器5进行冷却。
在本申请的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所 指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本申请的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本申请中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接或彼此可通讯；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
在本申请中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本申请中，术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本申请的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
尽管上面已经示出和描述了本申请的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本申请的限制，本领域的普通技术人员在本申请的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (9)

  1. 一种用于钢厂烧结机烟气的低温脱硫脱硝系统，其特征在于，包括：
    烧结机，所述烧结机包括烟气排放口；
    冷却系统，所述冷却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冷却系统内，从而将烟气的温度降到20℃以下；
    吸附塔，所述吸附塔包括第一进料口、第一出料口和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吸附塔内，从而对所述烟气进行脱硫、脱硝，所述第一进料口用于向所述吸附塔内加入吸附剂，所述第一出料口用于排出所述吸附塔内的吸附剂；
    再生塔，所述再生塔包括酸气出口、第二进料口和第二出料口，所述第二进料口用于向所述再生塔内加入所述第一出料口排出的吸附剂，所述第二出料口用于排出所述再生塔内的吸附剂，所述再生塔还包括加热管道，所述加热管道用于加热所述再生塔内的吸附剂，从而使所述再生塔内的吸附剂释放酸气，所述酸气出口用于排出所述酸气。
  2. 根据权利要求1所述的用于钢厂烧结机烟气的低温脱硫脱硝系统，其特征在于，还包括预冷器，所述预冷器包括第三进料口和第三出料口，所述第三进料口用于向所述预冷器内加入所述第二出料口排出的吸附剂，所述第三出料口用于排出所述预冷器内的吸附剂，所述预冷器还包括冷却管道，所述冷却管道用于通入冷却气体，以便冷却所述预冷器内的吸附剂。
  3. 根据权利要求2所述的用于钢厂烧结机烟气的低温脱硫脱硝系统，其特征在于，所述冷却管道包括第三烟气进口和第三烟气出口，所述第三烟气进口与所述第二烟气出口连通，以便所述吸附塔内的烟气通入所述冷却管道，所述烟气形成所述冷却气体。
  4. 根据权利要求1-3中任一项所述的用于钢厂烧结机烟气的低温脱硫脱硝系统，其特征在于，还包括第一运送装置，所述第一运送装置用于将所述第一出料口排出的吸附剂运送到所述再生塔的所述第二进料口，以便向所述再生塔内加入所述第一出料口排出的吸附剂。
  5. 根据权利要求2或3所述的用于钢厂烧结机烟气的低温脱硫脱硝系统，其特征在于，还包括第二运送装置和第三运送装置，所述第二运送装置用于将所述第二出料口排出的吸附剂运送到所述预冷器的所述第三进料口，以便向所述预冷器内加入所述第二出料口排出的吸附剂，
    所述第三运送装置用于将所述第三出料口排出的吸附剂运送到所述吸附塔的所述第一进料口，以便向所述吸附塔内加入所述第三出料口排出的吸附剂。
  6. 根据权利要求1-3中任一项所述的用于钢厂烧结机烟气的低温脱硫脱硝系统，其特 征在于，还包括除尘器，所述除尘器包括进气口和出气口，所述除尘器的进气口与所述烟气排放口连通，以便将所述烟气通入所述除尘器，所述除尘器的出气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。
  7. 根据权利要求6所述的用于钢厂烧结机烟气的低温脱硫脱硝系统，其特征在于，还包括第一引风机，所述第一引风机设在所述冷却系统和所述除尘器之间，所述第一引风机的进风口与所述除尘器的出气口连通，所述第一引风机的出风口与所述第一烟气进口连通，从而使所述第一烟气进口与所述除尘器的出气口连通。
  8. 根据权利要求1-3中任一项所述的用于钢厂烧结机烟气的低温脱硫脱硝系统，其特征在于，还包括第二引风机，所述第二引风机的进风口与所述酸气出口连通，以便将所述酸气排出。
  9. 根据权利要求5所述的用于钢厂烧结机烟气的低温脱硫脱硝系统，其特征在于，还包括烟筒，所述烟筒的进口与所述预冷器的所述第三烟气出口连通，以便排放所述烟气。
PCT/CN2022/099160 2021-09-28 2022-06-16 用于钢厂烧结机烟气的低温脱硫脱硝系统 WO2023050895A1 (zh)

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