WO2024239727A1 - Scr reactor system capable of realizing in-situ regeneration and method for using same - Google Patents

Scr reactor system capable of realizing in-situ regeneration and method for using same Download PDF

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Publication number
WO2024239727A1
WO2024239727A1 PCT/CN2024/077514 CN2024077514W WO2024239727A1 WO 2024239727 A1 WO2024239727 A1 WO 2024239727A1 CN 2024077514 W CN2024077514 W CN 2024077514W WO 2024239727 A1 WO2024239727 A1 WO 2024239727A1
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flue gas
regeneration
scr reactor
partition
gas inlet
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French (fr)
Chinese (zh)
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陈廷
银登国
杜文韬
陈倬
武娟
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Dongfangboiler Group Co Ltd
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Dongfangboiler Group Co Ltd
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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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • 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
    • B01D53/48—Sulfur compounds
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/75—Multi-step processes
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8603—Removing sulfur compounds
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8603—Removing sulfur compounds
    • B01D53/8609—Sulfur oxides
    • 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
    • B01D53/96—Regeneration, reactivation or recycling of reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

Definitions

  • the present invention relates to the technical field of environmental protection denitration, and in particular to an in-situ regenerable SCR reactor system and a method for using the same.
  • SCR Selective catalytic reduction
  • the most widely used temperature for SCR catalysts is 280-450°C. At this temperature, most of the ammonium bisulfate is in gaseous state, which has little effect on the catalyst.
  • the flue gas temperature is generally lower than 280°C after desulfurization and dust removal, and medium and low temperature SCR processes are often used for denitrification.
  • the medium and low temperature SCR reaction system most of the ammonium bisulfate is in liquid state, has strong adhesion, and is very easy to adhere to the surface of the catalyst to form contamination.
  • liquid ammonium bisulfate is easy to adsorb dust in the flue gas, which expands the contamination area, resulting in a reduction in the effective contact area between the catalyst and the flue gas, affecting the catalytic reaction process, reducing the catalytic efficiency, and causing problems such as NOx and ammonia escape emissions not meeting the standards.
  • a regeneration system is usually provided to achieve in-situ regeneration of the catalyst.
  • the patent with publication number CN107913598A discloses an online regeneration system and regeneration method for SCR low temperature denitration catalyst in a domestic waste incineration plant. By setting a regeneration fan, a heating furnace for regeneration, a regeneration pipeline and a baffle, the in-situ regeneration of the SCR catalyst is achieved.
  • the regeneration process requires the flue gas to be completely bypassed. During the regeneration period, the SCR reactor completely loses its denitration function, and the NOx emitted from the flue gas cannot meet the standard.
  • the patent with publication number CN208082232U discloses a low-temperature SCR denitration reactor that can be maintained online. By partitioning the SCR reactor, the SCR catalyst can be regenerated online. The regeneration process does not require flue gas bypass and the operation of the denitration device does not need to be stopped. Nitrogen oxides can be discharged up to standard during maintenance. However, after the catalyst in the SCR reactor has been running for a long time, ammonium bisulfate and particulate matter will be deposited on the surface of the catalyst. During the regeneration process, the catalyst is heated by high-temperature air (or flue gas) to vaporize the ammonium bisulfate attached to the catalyst surface and decompose it into sulfide and ammonia. The particulate matter adsorbed by the ammonium bisulfate will also be released. If the regenerated exhaust gas is directly discharged into the chimney, it will cause sulfide and ammonia to escape and particulate matter to exceed the standard.
  • the present invention provides an in-situ regenerable SCR reactor system and a method for using the same, which solves the problems of sulfide and ammonia escape and excessive particulate matter emissions in flue gas caused by gasification and decomposition of ammonium bisulfate in the prior art.
  • An in-situ regenerative SCR reactor system comprises a desulfurization tower and an SCR reactor which are connected in sequence along the flow direction of original flue gas, and also comprises a flue gas heater, a regeneration fan, an induced draft fan, a regeneration flue gas inlet valve, a waste gas exhaust valve, and a flue gas heat exchanger.
  • the SCR reactor is divided into j separate partitions, each partition is independent from the inlet to the outlet, each partition is connected with an original flue gas inlet and outlet baffle, a regeneration flue gas inlet and outlet valve, the induced draft fan, the regeneration flue gas inlet valve, the regeneration fan, the flue gas heat exchanger, the flue gas heater, and the regeneration flue gas inlet and outlet valves of each partition are connected in sequence, and the regeneration flue gas inlet and outlet valves of each partition, the flue gas heat exchanger, the waste gas exhaust valve, and the original flue gas inlet of the desulfurization tower are connected in sequence; wherein j ⁇ 2 and j is an integer.
  • it also includes a dust collector, and the desulfurization tower, the dust collector, and the SCR reactor are connected in sequence along the original flue gas flow direction.
  • it also includes an ammonia injection grid, a desulfurization tower, a dust collector, an ammonia injection grid, and an SCR reactor which are connected in sequence along the original flue gas flow direction.
  • the SCR reactor is divided into j separate partitions by the vertical partition.
  • the flue gas heater is one or more of an electric heater, a steam heater, and a hot air furnace.
  • it also includes a chimney, and the SCR reactor, the induced draft fan and the chimney are connected in sequence.
  • a method for using an in-situ regenerable SCR reactor system using the in-situ regenerable SCR reactor system, when the catalyst in the i-th partition is contaminated and needs to be regenerated, the original flue gas inlet and outlet dampers of the i-th partition are adjusted to a closed state, and the inlet and outlet dampers of the other partitions remain open;
  • the purified flue gas is heated to the regeneration temperature by the flue gas heat exchanger and the flue gas heater, and then enters the i-th partition.
  • the ammonium bisulfate attached to the catalyst in the i-th partition is gasified and decomposed into sulfide and ammonia.
  • the particulate matter adsorbed by the ammonium bisulfate is also desorbed and released.
  • the inlet and outlet baffles of the partition are closed, and the partition is repaired, while other partitions operate normally.
  • the temperature required for regeneration is 350°C to 400°C.
  • the present invention has the following beneficial effects:
  • the SCR reactor of the present invention is divided into zones, and the number of zones is not less than 2.
  • the specific number of zones is reasonably determined based on the size of the reactor and the operating conditions of the unit, so that the SCR reactor can operate continuously from low load to high load of the unit, and the catalyst can be regenerated without stopping the unit.
  • the exhaust point of the catalyst regeneration pipeline of the present invention is located before the desulfurization and dust removal unit.
  • the exhaust gas generated during the catalyst regeneration process does not need to be pretreated and is directly sent to the desulfurization and dust removal unit through the pipeline. It is discharged after flue gas purification, and the catalyst regeneration exhaust gas treatment is completed safely, environmentally friendly and quickly, ensuring that the flue gas meets the emission standards during the catalyst regeneration process.
  • the flue gas heater of the present invention adopts a grouping design and a regeneration fan variable frequency regulation, which can meet the heat load and air volume requirements of multiple catalyst partitions for simultaneous regeneration.
  • the present invention uses a flue gas heat exchanger to increase the clean flue gas temperature, save energy consumption, reduce the flue gas temperature after regeneration, and avoid high-temperature flue gas entering the absorption tower causing uneven flue gas temperature that affects desulfurization efficiency and equipment safety.
  • FIG1 is a schematic structural diagram of an in-situ regenerable SCR reactor system according to the present invention.
  • the present invention proposes an in-situ regenerated SCR reactor system to solve the problems of sulfide, ammonia escape and excessive particulate matter emissions in flue gas caused by ammonium bisulfate gasification and decomposition during the regeneration process of the SCR catalyst.
  • the present invention can achieve in-situ regeneration of the SCR catalyst without stopping the machine, affecting the denitrification efficiency and ensuring that the sulfide and particulate matter emissions in the flue gas do not exceed the standard.
  • the present invention has the advantages of reasonable design, high working efficiency, convenient maintenance and reliable system.
  • the in-situ regeneration SCR reactor system designed by the present invention is composed of the following parts: an SCR reactor 4 for providing a denitration reaction site, a flue gas heater (electric heater, steam heater, hot blast furnace, etc.) 5 for providing a heat source, a regeneration fan 6 for providing kinetic energy, a pipeline system and an instrument valve.
  • the gas used in the regeneration process of the in-situ regeneration SCR reactor system designed by the present invention is clean flue gas, the clean flue gas inlet point is located after the induced draft fan 7, and the flue gas exhaust point after regeneration is located before the dust collector 2 and the desulfurization tower 1.
  • the high-temperature flue gas after regeneration exchanges heat with the low-temperature clean flue gas through the flue gas heat exchanger 15, thereby increasing the clean flue gas temperature and reducing the energy consumption of the flue gas heater 5.
  • the SCR reactor 4 is divided into 1, 2, ... j, a total of j areas (j ⁇ 2) by vertical partitions, and each partition inlet and outlet flue is provided with an electric baffle (i partition original flue gas inlet and outlet baffle 13, j partition original flue gas inlet and outlet baffle 14), which is used to isolate the corresponding partition from the original flue gas during regeneration or maintenance.
  • the regeneration pipelines connected to each partition are equipped with valves (regeneration flue gas inlet and outlet valves 11 for partition i, regeneration flue gas inlet and outlet valves 12 for partition j), which cooperate with the electric dampers at the inlet and outlet of the corresponding partitions (original flue gas inlet and outlet dampers 13 for partition i, original flue gas inlet and outlet dampers 14 for partition j) to realize automatic switching of the corresponding partition operation, regeneration, maintenance and other working conditions.
  • valves regeneration flue gas inlet and outlet valves 11 for partition i, regeneration flue gas inlet and outlet valves 12 for partition j
  • the present invention divides the SCR reactor into zones and reasonably sets the air inlet and exhaust points of the catalyst regeneration pipeline, thereby mainly achieving the following beneficial effects:
  • the SCR reactor is partitioned, with the number of partitions not less than 2.
  • the specific number of partitions is reasonably determined based on the reactor size and the unit operating conditions, so that the SCR reactor can operate continuously from low load to high load of the unit and the catalyst can be regenerated without stopping the unit.
  • the exhaust point of the catalyst regeneration pipeline is located in front of the desulfurization and dust removal unit.
  • the exhaust gas generated during the catalyst regeneration process does not need to be pretreated and is directly sent to the desulfurization and dust removal unit through the pipeline. It is discharged after flue gas purification, and the catalyst regeneration exhaust gas treatment is completed safely, environmentally friendly and quickly to ensure that the flue gas emissions meet the standards during the catalyst regeneration process.
  • the flue gas heater adopts a group design and the regeneration fan is frequency-controlled to meet the heat load and air volume requirements of multiple catalyst partitions for simultaneous regeneration.
  • the flue gas heat exchanger is used to increase the clean flue gas temperature, save energy, reduce the flue gas temperature after regeneration, and avoid the high-temperature flue gas entering the absorption tower causing uneven flue gas temperature and affecting the desulfurization efficiency and equipment safety.
  • the reactor of the present invention is divided into zones, and isolation baffles are arranged before and after each zone.
  • the reactor of the present invention is provided with regeneration air at each partition inlet, adopts the clean flue gas after denitration, and is provided with a regeneration fan, a flue gas heat exchanger and a flue gas heater to introduce the heated clean flue gas into the reactor, and the regeneration air interface is located behind the reactor baffle door.
  • Each partition outlet of the reactor of the present invention is connected to the inlet of the desulfurization device, and the regenerated waste gas is purified through the desulfurization, dust removal and denitration devices.
  • Example 1 As shown in FIG1 , as a further optimization of Example 1, based on Example 1, this embodiment also includes the following technical features:
  • the SCR reactor 4 is divided into j zones, 1, 2, ...j, by vertical partitions 16. Each zone inlet and outlet flue is provided with an electric damper (i zone original flue gas inlet and outlet damper 13, j zone original flue gas inlet and outlet damper 14), and each zone is independent from the inlet to the outlet of the SCR reactor 4.
  • the inlet and outlet dampers of the SCR reactor 4 i zone original flue gas inlet and outlet damper 13, j zone original flue gas inlet and outlet damper 14
  • the regeneration flue gas inlet valve 9 and the exhaust gas exhaust valve 10 on the regeneration pipeline system are all closed, and the flue gas heater 5 and the regeneration fan 6 do not work.
  • the unpurified raw flue gas passes through the desulfurization tower 1, the dust collector 2, the ammonia injection grid 3, and the SCR reactor 4 in turn, and is sent to the chimney 8 by the induced draft fan 7 and discharged into the atmosphere.
  • the catalyst of the i-th partition (i ⁇ j) is contaminated, the denitrification efficiency is reduced, and the catalyst needs to be regenerated. Then adjust the original flue gas inlet and outlet dampers 13 of the i-th partition to the closed state, and the inlet and outlet dampers of the other partitions remain open. Open the regenerated flue gas inlet valve 9 and the exhaust gas exhaust valve 10, open the regenerated flue gas inlet and outlet valve 11 of the i-th partition, and keep the electric valves of the other partitions closed, and start the flue gas heater 5 and the regeneration fan 6.
  • the purified flue gas is heated to the regeneration temperature (350°C to 400°C) required for regeneration by the flue gas heat exchanger 15 and the flue gas heater 5, and enters the i-th partition.
  • the ammonium bisulfate attached to the catalyst of the i-th partition is gasified and decomposed at high temperature, and the ammonium bisulfate is decomposed into sulfide and ammonia.
  • the particulate matter adsorbed by the ammonium bisulfate will also be desorbed and released.
  • the flue gas generated by decomposition and release is heat exchanged with the clean flue gas extracted by the regeneration fan 6 through the flue gas heat exchanger 15, mixed with the original flue gas after cooling, and re-introduced into the dust collector 2 and the desulfurization tower 1. After the flue gas purification is completed, it is introduced into the chimney 8 by the induced draft fan 7 and discharged into the atmosphere.
  • the flue gas heater adopts a group design and the regeneration fan is frequency-controlled, which can meet the heat load and air volume requirements of multiple catalyst partitions for simultaneous regeneration. When regeneration needs to be completed in a short time, multiple catalyst bins can be regenerated simultaneously.
  • the regenerated flue gas inlet valve 9 and the waste gas exhaust valve 10 are preferably electric valves
  • the i-zone regenerated flue gas inlet and outlet valves 11 and the j-zone regenerated flue gas inlet and outlet valves 12 are preferably electric valves
  • the i-zone original flue gas inlet and outlet baffles 13 and the j-zone original flue gas inlet and outlet baffles 14 are preferably electric baffles.
  • the present invention can be preferably implemented.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
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Abstract

An SCR reactor system capable of realizing in-situ regeneration and a method for using same. An SCR reactor is divided into j independent zones; all zones are mutually independent between an inlet and an outlet; each zone is connected to an original flue gas inlet and outlet baffle, and a regenerated flue gas inlet and outlet valve; an induced draft fan (7), a regenerated flue gas inlet valve (9), a regeneration fan (6), a flue gas heat exchanger (15), a flue gas heater (5), and the regenerated flue gas inlet and outlet valve of each zone are sequentially communicated; the regenerated flue gas inlet and outlet valve of each zone, the flue gas heat exchanger (15), a waste gas exhaust valve (10), and an original flue gas inlet of a desulfurization column (1) are sequentially communicated.

Description

一种可原位再生的SCR反应器系统及其使用方法An in-situ regenerable SCR reactor system and use method thereof 技术领域Technical Field

本发明涉及环保脱硝技术领域，具体是一种可原位再生的SCR反应器系统及其使用方法。The present invention relates to the technical field of environmental protection denitration, and in particular to an in-situ regenerable SCR reactor system and a method for using the same.

背景技术Background Art

选择性催化还原(SCR)技术是一种高效烟气脱硝技术。SCR催化剂在脱硝过程中不可避免的会将烟气中SO2部分氧化为SO3，SO3与SCR系统中的氨、水蒸气会反应生成硫酸氢氨(ABS)，反应方程式如下：
NH3+SO3+H2O＝NH4HSO4。Selective catalytic reduction (SCR) technology is a highly efficient flue gas denitrification technology. During the denitrification process, the SCR catalyst will inevitably oxidize part of the SO 2 in the flue gas into SO 3 , and SO 3 will react with ammonia and water vapor in the SCR system to form ammonium bisulfate (ABS). The reaction equation is as follows:
NH 3 +SO 3 +H 2 O=NH 4 HSO 4 .

目前SCR催化剂应用最广泛的温度为280～450℃，该温度下硫酸氢氨大部分为气态，对催化剂影响不大。但是某些行业如焦化炉和垃圾焚烧炉等烟气净化中，烟气经过脱硫除尘后，温度一般低于280℃，脱硝常使用中低温SCR工艺。在中低温SCR反应系统中，大部分硫酸氢氨呈液态，具有很强的黏附性，极易附着于催化剂表面，形成沾污，且液态的硫酸氢铵易于将烟气中的粉尘吸附，使沾污区域扩大化，导致催化剂与烟气的有效接触面积减少，影响催化反应过程，降低催化效率，从而引起NOx与氨逃逸排放不达标等问题。At present, the most widely used temperature for SCR catalysts is 280-450℃. At this temperature, most of the ammonium bisulfate is in gaseous state, which has little effect on the catalyst. However, in flue gas purification in some industries such as coking furnaces and waste incinerators, the flue gas temperature is generally lower than 280℃ after desulfurization and dust removal, and medium and low temperature SCR processes are often used for denitrification. In the medium and low temperature SCR reaction system, most of the ammonium bisulfate is in liquid state, has strong adhesion, and is very easy to adhere to the surface of the catalyst to form contamination. In addition, liquid ammonium bisulfate is easy to adsorb dust in the flue gas, which expands the contamination area, resulting in a reduction in the effective contact area between the catalyst and the flue gas, affecting the catalytic reaction process, reducing the catalytic efficiency, and causing problems such as NOx and ammonia escape emissions not meeting the standards.

对于中低温SCR反应系统，通常设置有再生系统，可实现催化剂的原位再生。公开号为CN107913598A的专利公布了一种生活垃圾焚烧厂SCR低温脱硝催化剂在线再生系统及其再生方法，通过设置再生风机、再生用加热电炉、再生管道和挡板等，实现SCR催化剂原位再生，但再生过程需要将烟气全部旁路，再生期间SCR反应器完全失去脱硝的作用，排放的烟气NOx无法达标。公开号为CN208082232U的专利公布了一种可在线维护的低温SCR脱硝反应器，通过将SCR反应器分区，实现SCR催化剂可在线再生，再生过程无需将烟气旁路，无需停止脱硝装置的运行，检修时氮氧化物可实现达标排放，但由于SCR反应器中催化剂长期运行后，催化剂表面会沉积附着硫酸氢铵和颗粒物，在再生过程中，通过高温空气(或烟气)加热催化剂，使附着在催化剂表面的硫酸氢铵气化，重新分解为硫化物和氨气，被硫酸氢铵吸附的颗粒物也会被释放，如将再生废气直接排入烟囱，会引起硫化物、氨逃逸和颗粒物超标。For medium and low temperature SCR reaction systems, a regeneration system is usually provided to achieve in-situ regeneration of the catalyst. The patent with publication number CN107913598A discloses an online regeneration system and regeneration method for SCR low temperature denitration catalyst in a domestic waste incineration plant. By setting a regeneration fan, a heating furnace for regeneration, a regeneration pipeline and a baffle, the in-situ regeneration of the SCR catalyst is achieved. However, the regeneration process requires the flue gas to be completely bypassed. During the regeneration period, the SCR reactor completely loses its denitration function, and the NOx emitted from the flue gas cannot meet the standard. The patent with publication number CN208082232U discloses a low-temperature SCR denitration reactor that can be maintained online. By partitioning the SCR reactor, the SCR catalyst can be regenerated online. The regeneration process does not require flue gas bypass and the operation of the denitration device does not need to be stopped. Nitrogen oxides can be discharged up to standard during maintenance. However, after the catalyst in the SCR reactor has been running for a long time, ammonium bisulfate and particulate matter will be deposited on the surface of the catalyst. During the regeneration process, the catalyst is heated by high-temperature air (or flue gas) to vaporize the ammonium bisulfate attached to the catalyst surface and decompose it into sulfide and ammonia. The particulate matter adsorbed by the ammonium bisulfate will also be released. If the regenerated exhaust gas is directly discharged into the chimney, it will cause sulfide and ammonia to escape and particulate matter to exceed the standard.

发明内容Summary of the invention

为克服现有技术的不足，本发明提供了一种可原位再生的SCR反应器系统及其使用方法，解决现有技术存在的由于硫酸氢铵气化、分解等引起烟气中硫化物、氨逃逸和颗粒物排放超标等问题。In order to overcome the shortcomings of the prior art, the present invention provides an in-situ regenerable SCR reactor system and a method for using the same, which solves the problems of sulfide and ammonia escape and excessive particulate matter emissions in flue gas caused by gasification and decomposition of ammonium bisulfate in the prior art.

本发明解决上述问题所采用的技术方案是：The technical solution adopted by the present invention to solve the above problems is:

一种可原位再生的SCR反应器系统，包括沿原烟气流动方向依次连通的脱硫塔、SCR反应器，还包括烟气加热器、再生风机、引风机、再生烟气入口阀门、废气排气阀门、烟气换热器，SCR反应器分为j个单独的分区，每个分区从进口到出口之间相互独立，每个分区均连接有原烟气进出口挡板、再生烟气进出口阀，引风机、再生烟气入口阀门、再生风机、烟气换热器、烟气加热器、各分区的再生烟气进出口阀依次连通，各分区的再生烟气进出口阀、烟气换热器、废气排气阀门、脱硫塔的原烟气入口依次连通；其中，j≥2且j为整数。An in-situ regenerative SCR reactor system comprises a desulfurization tower and an SCR reactor which are connected in sequence along the flow direction of original flue gas, and also comprises a flue gas heater, a regeneration fan, an induced draft fan, a regeneration flue gas inlet valve, a waste gas exhaust valve, and a flue gas heat exchanger. The SCR reactor is divided into j separate partitions, each partition is independent from the inlet to the outlet, each partition is connected with an original flue gas inlet and outlet baffle, a regeneration flue gas inlet and outlet valve, the induced draft fan, the regeneration flue gas inlet valve, the regeneration fan, the flue gas heat exchanger, the flue gas heater, and the regeneration flue gas inlet and outlet valves of each partition are connected in sequence, and the regeneration flue gas inlet and outlet valves of each partition, the flue gas heat exchanger, the waste gas exhaust valve, and the original flue gas inlet of the desulfurization tower are connected in sequence; wherein j≥2 and j is an integer.

作为一种优选的技术方案，还包括除尘器，脱硫塔、除尘器、SCR反应器沿原烟气流动方向依次连通。As a preferred technical solution, it also includes a dust collector, and the desulfurization tower, the dust collector, and the SCR reactor are connected in sequence along the original flue gas flow direction.

作为一种优选的技术方案，还包括喷氨格栅，脱硫塔、除尘器、喷氨格栅、SCR反应器沿原烟气流动方向依次连通。As a preferred technical solution, it also includes an ammonia injection grid, a desulfurization tower, a dust collector, an ammonia injection grid, and an SCR reactor which are connected in sequence along the original flue gas flow direction.

作为一种优选的技术方案，还包括竖向隔板，SCR反应器通过竖向隔板分为j个单独的分区。As a preferred technical solution, it also includes a vertical partition, and the SCR reactor is divided into j separate partitions by the vertical partition.

作为一种优选的技术方案，烟气加热器为电加热器、蒸汽加热器、热风炉中的一种或多种。As a preferred technical solution, the flue gas heater is one or more of an electric heater, a steam heater, and a hot air furnace.

作为一种优选的技术方案，还包括烟囱，SCR反应器、引风机、烟囱依次连通。As a preferred technical solution, it also includes a chimney, and the SCR reactor, the induced draft fan and the chimney are connected in sequence.

作为一种优选的技术方案，2≤j≤10。As a preferred technical solution, 2≤j≤10.

一种可原位再生的SCR反应器系统的使用方法，采用所述的一种可原位再生的SCR反应器系统，在第i个分区催化剂被沾污、需要进行催化剂再生时，则调整第i分区原烟气进出口挡板至关闭状态，其余分区进出口挡板保持开启；A method for using an in-situ regenerable SCR reactor system, using the in-situ regenerable SCR reactor system, when the catalyst in the i-th partition is contaminated and needs to be regenerated, the original flue gas inlet and outlet dampers of the i-th partition are adjusted to a closed state, and the inlet and outlet dampers of the other partitions remain open;

开启再生烟气入口阀门、废气排气阀门，开启第i分区再生烟气进出口阀，其余分区的再生烟气进出口阀保持关闭，启动烟气加热器和再生风机；Open the regeneration flue gas inlet valve and exhaust gas valve, open the regeneration flue gas inlet and outlet valves of the i-th partition, keep the regeneration flue gas inlet and outlet valves of the other partitions closed, and start the flue gas heater and regeneration fan;

净化烟气经烟气换热器和烟气加热器加热至再生所需温度，然后进入第i分区，第i分区催化剂上附着的硫酸氢铵发生气化、分解，硫酸氢铵分解为硫化物和氨气，被硫酸氢铵吸附的颗粒物也会脱附并被释放；The purified flue gas is heated to the regeneration temperature by the flue gas heat exchanger and the flue gas heater, and then enters the i-th partition. The ammonium bisulfate attached to the catalyst in the i-th partition is gasified and decomposed into sulfide and ammonia. The particulate matter adsorbed by the ammonium bisulfate is also desorbed and released.

分解释放产生的烟气经烟气换热器与再生风机抽取的净烟气换热，降温后与原烟气混合，重新被引入到脱硫塔的原烟气入口，完成烟气净化后，由引风机排入大气；The flue gas released by decomposition exchanges heat with the clean flue gas extracted by the regeneration fan through the flue gas heat exchanger, is mixed with the original flue gas after cooling, and is reintroduced into the original flue gas inlet of the desulfurization tower. After the flue gas is purified, it is discharged into the atmosphere by the induced draft fan;

其中，i≤j。Among them, i≤j.

作为一种优选的技术方案，当第j个分区发生故障、需要对该分区停机检修时，则关闭该分区进出口挡板，对该分区进行检修，其他分区正常工作。As a preferred technical solution, when the jth partition fails and needs to be shut down for maintenance, the inlet and outlet baffles of the partition are closed, and the partition is repaired, while other partitions operate normally.

作为一种优选的技术方案，再生所需温度为350℃至400℃。As a preferred technical solution, the temperature required for regeneration is 350°C to 400°C.

本发明相比于现有技术，具有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:

(1)本发明SCR反应器分区，分区数量不小于2个，具体分区数量依据反应器大小及机组运行工况合理确定，实现SCR反应器在机组低负荷至高负荷间可连续运行，实现在不停机的前提下完成催化剂的再生。 (1) The SCR reactor of the present invention is divided into zones, and the number of zones is not less than 2. The specific number of zones is reasonably determined based on the size of the reactor and the operating conditions of the unit, so that the SCR reactor can operate continuously from low load to high load of the unit, and the catalyst can be regenerated without stopping the unit.

(2)本发明催化剂再生管路排气点位于脱硫除尘单元前，催化剂再生过程产生的废气，不需要预处理，直接通过管路送入脱硫除尘单元前，经烟气净化后排放，安全、环保、快捷地完成催化剂再生废气处理，保证催化剂再生过程中，烟气达标排放。(2) The exhaust point of the catalyst regeneration pipeline of the present invention is located before the desulfurization and dust removal unit. The exhaust gas generated during the catalyst regeneration process does not need to be pretreated and is directly sent to the desulfurization and dust removal unit through the pipeline. It is discharged after flue gas purification, and the catalyst regeneration exhaust gas treatment is completed safely, environmentally friendly and quickly, ensuring that the flue gas meets the emission standards during the catalyst regeneration process.

(3)本发明烟气加热器采用分组设计，再生风机变频调节，可以满足多个催化剂分区同时再生的热负荷和风量要求。(3) The flue gas heater of the present invention adopts a grouping design and a regeneration fan variable frequency regulation, which can meet the heat load and air volume requirements of multiple catalyst partitions for simultaneous regeneration.

(4)本发明采用烟气换热器提高净烟气温度，节约能耗，降低再生后烟气温度，避免进入吸收塔的高温烟气造成烟温不均匀影响脱硫效率和设备安全。(4) The present invention uses a flue gas heat exchanger to increase the clean flue gas temperature, save energy consumption, reduce the flue gas temperature after regeneration, and avoid high-temperature flue gas entering the absorption tower causing uneven flue gas temperature that affects desulfurization efficiency and equipment safety.

附图说明BRIEF DESCRIPTION OF THE DRAWINGS

图1为本发明所述的一种可原位再生的SCR反应器系统的结构示意图。FIG1 is a schematic structural diagram of an in-situ regenerable SCR reactor system according to the present invention.

附图中标记及其相应的名称：1-脱硫塔、2-除尘器、3-喷氨格栅、4-SCR反应器、5-烟气加热器、6-再生风机、7-引风机、8-烟囱、9-再生烟气入口阀门、10-废气排气阀门、11-i分区再生烟气进出口阀、12-j分区再生烟气进出口阀、13-i分区原烟气进出口挡板、14-j分区原烟气进出口挡板、15-烟气换热器、16-竖向隔板。Marks and their corresponding names in the accompanying drawings: 1-desulfurization tower, 2-dust collector, 3-ammonia injection grid, 4-SCR reactor, 5-flue gas heater, 6-regeneration fan, 7-induced draft fan, 8-chimney, 9-regeneration flue gas inlet valve, 10-waste gas exhaust valve, 11-i partition regeneration flue gas inlet and outlet valves, 12-j partition regeneration flue gas inlet and outlet valves, 13-i partition original flue gas inlet and outlet baffles, 14-j partition original flue gas inlet and outlet baffles, 15-flue gas heat exchanger, 16-vertical partition.

具体实施方式DETAILED DESCRIPTION

下面结合实施例及附图，对本发明作进一步的详细说明，但本发明的实施方式不限于此。The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

实施例1Example 1

如图1所示，本发明针对SCR催化剂再生过程中，由于硫酸氢铵气化、分解等引起烟气中硫化物、氨逃逸和颗粒物排放超标等问题，提出了一种可原位再生的SCR反应器系统。本发明可以在不停机、不影响脱硝效率且烟气中硫化物、颗粒物排放不超标的要求下，实现SCR催化剂原位再生。本发明具有设计合理、工作效率高、检修方便、系统可靠等优势。As shown in FIG1 , the present invention proposes an in-situ regenerated SCR reactor system to solve the problems of sulfide, ammonia escape and excessive particulate matter emissions in flue gas caused by ammonium bisulfate gasification and decomposition during the regeneration process of the SCR catalyst. The present invention can achieve in-situ regeneration of the SCR catalyst without stopping the machine, affecting the denitrification efficiency and ensuring that the sulfide and particulate matter emissions in the flue gas do not exceed the standard. The present invention has the advantages of reasonable design, high working efficiency, convenient maintenance and reliable system.

本发明设计的原位再生SCR反应器系统由以下部分组成：用于提供脱硝反应场所的SCR反应器4、提供热源的烟气加热器(电加热器、蒸汽加热器、热风炉等)5、提供动能的再生风机6、管路系统和仪表阀门。本发明设计的原位再生SCR反应器系统再生过程所使用的气体为净烟气，净烟气进气点位于引风机7后，再生后的烟气排气点位于除尘器2和脱硫塔1前。再生后的高温烟气通过烟气换热器15与低温净烟气换热，提高净烟气温度，降低烟气加热器5的能耗。SCR反应器4通过竖向隔板分为1、2、……j共j个区域(j≥2)，每个分区进出口烟道上均设有电动挡板(i分区原烟气进出口挡板13、j分区原烟气进出口挡板14)，用于对应分区在再生或检修时与原烟气隔离。与各分区连接的再生管路上均设有阀门(i分区再生烟气进出口阀11、j分区再生烟气进出口阀12)，与对应分区进出口的电动挡板(i分区原烟气进出口挡板13、j分区原烟气进出口挡板14)配合，实现对应分区运行、再生、检修等工况自动切换。The in-situ regeneration SCR reactor system designed by the present invention is composed of the following parts: an SCR reactor 4 for providing a denitration reaction site, a flue gas heater (electric heater, steam heater, hot blast furnace, etc.) 5 for providing a heat source, a regeneration fan 6 for providing kinetic energy, a pipeline system and an instrument valve. The gas used in the regeneration process of the in-situ regeneration SCR reactor system designed by the present invention is clean flue gas, the clean flue gas inlet point is located after the induced draft fan 7, and the flue gas exhaust point after regeneration is located before the dust collector 2 and the desulfurization tower 1. The high-temperature flue gas after regeneration exchanges heat with the low-temperature clean flue gas through the flue gas heat exchanger 15, thereby increasing the clean flue gas temperature and reducing the energy consumption of the flue gas heater 5. The SCR reactor 4 is divided into 1, 2, ... j, a total of j areas (j≥2) by vertical partitions, and each partition inlet and outlet flue is provided with an electric baffle (i partition original flue gas inlet and outlet baffle 13, j partition original flue gas inlet and outlet baffle 14), which is used to isolate the corresponding partition from the original flue gas during regeneration or maintenance. The regeneration pipelines connected to each partition are equipped with valves (regeneration flue gas inlet and outlet valves 11 for partition i, regeneration flue gas inlet and outlet valves 12 for partition j), which cooperate with the electric dampers at the inlet and outlet of the corresponding partitions (original flue gas inlet and outlet dampers 13 for partition i, original flue gas inlet and outlet dampers 14 for partition j) to realize automatic switching of the corresponding partition operation, regeneration, maintenance and other working conditions.

本发明通过将SCR反应器分区，合理设置催化剂再生管路的进气点和排气点，主要获得以下有益效果：The present invention divides the SCR reactor into zones and reasonably sets the air inlet and exhaust points of the catalyst regeneration pipeline, thereby mainly achieving the following beneficial effects:

SCR反应器分区，分区数量不小于2个，具体分区数量依据反应器大小及机组运行工况合理确定，实现SCR反应器在机组低负荷至高负荷间可连续运行，实现在不停机的前提下完成催化剂的再生。The SCR reactor is partitioned, with the number of partitions not less than 2. The specific number of partitions is reasonably determined based on the reactor size and the unit operating conditions, so that the SCR reactor can operate continuously from low load to high load of the unit and the catalyst can be regenerated without stopping the unit.

催化剂再生管路排气点位于脱硫除尘单元前，催化剂再生过程产生的废气，不需要预处理，直接通过管路送入脱硫除尘单元前，经烟气净化后排放，安全、环保、快捷地完成催化剂再生废气处理，保证催化剂再生过程中，烟气达标排放。The exhaust point of the catalyst regeneration pipeline is located in front of the desulfurization and dust removal unit. The exhaust gas generated during the catalyst regeneration process does not need to be pretreated and is directly sent to the desulfurization and dust removal unit through the pipeline. It is discharged after flue gas purification, and the catalyst regeneration exhaust gas treatment is completed safely, environmentally friendly and quickly to ensure that the flue gas emissions meet the standards during the catalyst regeneration process.

烟气加热器采用分组设计，再生风机变频调节，可以满足多个催化剂分区同时再生的热负荷和风量要求。The flue gas heater adopts a group design and the regeneration fan is frequency-controlled to meet the heat load and air volume requirements of multiple catalyst partitions for simultaneous regeneration.

采用烟气换热器提高净烟气温度，节约能耗，降低再生后烟气温度，避免进入吸收塔的高温烟气造成烟温不均匀影响脱硫效率和设备安全。The flue gas heat exchanger is used to increase the clean flue gas temperature, save energy, reduce the flue gas temperature after regeneration, and avoid the high-temperature flue gas entering the absorption tower causing uneven flue gas temperature and affecting the desulfurization efficiency and equipment safety.

本发明反应器分区设置，每个分区前后设置隔离挡板。 The reactor of the present invention is divided into zones, and isolation baffles are arranged before and after each zone.

本发明反应器每个分区入口设再生风，采用脱硝后的净烟气，设置再生风机、烟气换热器和烟气加热器，将加热后的净烟气引入反应器中，再生风接口位置位于反应器挡板门之后。The reactor of the present invention is provided with regeneration air at each partition inlet, adopts the clean flue gas after denitration, and is provided with a regeneration fan, a flue gas heat exchanger and a flue gas heater to introduce the heated clean flue gas into the reactor, and the regeneration air interface is located behind the reactor baffle door.

本发明反应器每个分区出口接至脱硫装置入口，将再生废气通过脱硫、除尘、脱硝装置净化。Each partition outlet of the reactor of the present invention is connected to the inlet of the desulfurization device, and the regenerated waste gas is purified through the desulfurization, dust removal and denitration devices.

实施例2Example 2

如图1所示，作为实施例1的进一步优化，在实施例1的基础上，本实施例还包括以下技术特征：As shown in FIG1 , as a further optimization of Example 1, based on Example 1, this embodiment also includes the following technical features:

SCR反应器4通过竖向隔板16分为1、2、……j共j个区域，每个分区进出口烟道上均设有电动挡板(i分区原烟气进出口挡板13、j分区原烟气进出口挡板14)，各分区从SCR反应器4进口至出口之间相互独立。正常运行下，SCR反应器4进出口挡板(i分区原烟气进出口挡板13、j分区原烟气进出口挡板14)均处于打开状态，再生管路系统上的再生烟气入口阀门9和废气排气阀门10均处于关闭，烟气加热器5和再生风机6不工作。未净化的原烟气依次通过脱硫塔1、除尘器2、喷氨格栅3、SCR反应器4后，由引风机7送入烟囱8排入大气。The SCR reactor 4 is divided into j zones, 1, 2, ...j, by vertical partitions 16. Each zone inlet and outlet flue is provided with an electric damper (i zone original flue gas inlet and outlet damper 13, j zone original flue gas inlet and outlet damper 14), and each zone is independent from the inlet to the outlet of the SCR reactor 4. Under normal operation, the inlet and outlet dampers of the SCR reactor 4 (i zone original flue gas inlet and outlet damper 13, j zone original flue gas inlet and outlet damper 14) are all in the open state, the regeneration flue gas inlet valve 9 and the exhaust gas exhaust valve 10 on the regeneration pipeline system are all closed, and the flue gas heater 5 and the regeneration fan 6 do not work. The unpurified raw flue gas passes through the desulfurization tower 1, the dust collector 2, the ammonia injection grid 3, and the SCR reactor 4 in turn, and is sent to the chimney 8 by the induced draft fan 7 and discharged into the atmosphere.

在长时间运行后，第i个分区(i≤j)催化剂被沾污，脱硝效率降低，需要进行催化剂再生，则调整第i分区原烟气进出口挡板13至关闭状态，其余分区进出口挡板保持开启。开启再生烟气入口阀门9、废气排气阀门10，开启第i分区再生烟气进出口阀11，其余分区的电动阀保持关闭，启动烟气加热器5和再生风机6。净化烟气经烟气换热器15和烟气加热器5加热至再生所需温度(350℃至400℃)，进入第i分区，第i分区催化剂上附着的硫酸氢铵在高温下发生气化、分解，硫酸氢铵分解为硫化物和氨气，被硫酸氢铵吸附的颗粒物也会脱附并被释放。分解释放产生的烟气经烟气换热器15与再生风机6抽取的净烟气换热，降温后与原烟气混合，重新被引入到除尘器2和脱硫塔1前，完成烟气净化后，由引风机7引入烟囱8排入大气。After long-term operation, the catalyst of the i-th partition (i≤j) is contaminated, the denitrification efficiency is reduced, and the catalyst needs to be regenerated. Then adjust the original flue gas inlet and outlet dampers 13 of the i-th partition to the closed state, and the inlet and outlet dampers of the other partitions remain open. Open the regenerated flue gas inlet valve 9 and the exhaust gas exhaust valve 10, open the regenerated flue gas inlet and outlet valve 11 of the i-th partition, and keep the electric valves of the other partitions closed, and start the flue gas heater 5 and the regeneration fan 6. The purified flue gas is heated to the regeneration temperature (350℃ to 400℃) required for regeneration by the flue gas heat exchanger 15 and the flue gas heater 5, and enters the i-th partition. The ammonium bisulfate attached to the catalyst of the i-th partition is gasified and decomposed at high temperature, and the ammonium bisulfate is decomposed into sulfide and ammonia. The particulate matter adsorbed by the ammonium bisulfate will also be desorbed and released. The flue gas generated by decomposition and release is heat exchanged with the clean flue gas extracted by the regeneration fan 6 through the flue gas heat exchanger 15, mixed with the original flue gas after cooling, and re-introduced into the dust collector 2 and the desulfurization tower 1. After the flue gas purification is completed, it is introduced into the chimney 8 by the induced draft fan 7 and discharged into the atmosphere.

当第j个分区发生故障，需要对该分区停机检修时，关闭该分区进出口挡板，对分区进行检修，其他分区正常工作，不影响整个SCR系统运行，保证系统整体能连续稳定运行。When a fault occurs in the jth partition and the partition needs to be shut down for maintenance, the inlet and outlet dampers of the partition are closed and the partition is repaired. Other partitions work normally without affecting the operation of the entire SCR system, ensuring that the overall system can operate continuously and stably.

烟气加热器采用分组设计，再生风机变频调节，可以满足多个催化剂分区同时再生的热负荷和风量要求，在需要短时间内完成再生的时候，可进行多个催化剂仓同时再生。The flue gas heater adopts a group design and the regeneration fan is frequency-controlled, which can meet the heat load and air volume requirements of multiple catalyst partitions for simultaneous regeneration. When regeneration needs to be completed in a short time, multiple catalyst bins can be regenerated simultaneously.

本实施例中，再生烟气入口阀门9、废气排气阀门10优选电动阀门，i分区再生烟气进出口阀11、j分区再生烟气进出口阀12优选电动阀，i分区原烟气进出口挡板13、j分区原烟气进出口挡板14优选电动挡板。In this embodiment, the regenerated flue gas inlet valve 9 and the waste gas exhaust valve 10 are preferably electric valves, the i-zone regenerated flue gas inlet and outlet valves 11 and the j-zone regenerated flue gas inlet and outlet valves 12 are preferably electric valves, and the i-zone original flue gas inlet and outlet baffles 13 and the j-zone original flue gas inlet and outlet baffles 14 are preferably electric baffles.

如上所述，可较好地实现本发明。As described above, the present invention can be preferably implemented.

本说明书中所有实施例公开的所有特征，或隐含公开的所有方法或过程中的步骤，除了互相排斥的特征和/或步骤以外，均可以以任何方式组合和/或扩展、替换。All features disclosed in all embodiments in this specification, or steps in all methods or processes implicitly disclosed, except for mutually exclusive features and/or steps, can be combined and/or expanded or replaced in any manner.

以上所述，仅是本发明的较佳实施例而已，并非对本发明作任何形式上的限制，依据本发明的技术实质，在本发明的精神和原则之内，对以上实施例所作的任何简单的修改、等同替换与改进等，均仍属于本发明技术方案的保护范围之内。 The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. According to the technical essence of the present invention, within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims (10)

一种可原位再生的SCR反应器系统，其特征在于，包括沿原烟气流动方向依次连通的脱硫塔(1)、SCR反应器(4)，还包括烟气加热器(5)、再生风机(6)、引风机(7)、再生烟气入口阀门(9)、废气排气阀门(10)、烟气换热器(15)，SCR反应器(4)分为j个单独的分区，每个分区从进口到出口之间相互独立，每个分区均连接有原烟气进出口挡板、再生烟气进出口阀，引风机(7)、再生烟气入口阀门(9)、再生风机(6)、烟气换热器(15)、烟气加热器(5)、各分区的再生烟气进出口阀依次连通，各分区的再生烟气进出口阀、烟气换热器(15)、废气排气阀门(10)、脱硫塔(1)的原烟气入口依次连通；其中，j≥2且j为整数。An in-situ regenerative SCR reactor system, characterized in that it comprises a desulfurization tower (1) and an SCR reactor (4) which are connected in sequence along the flow direction of the original flue gas, and further comprises a flue gas heater (5), a regeneration fan (6), an induced draft fan (7), a regeneration flue gas inlet valve (9), an exhaust gas exhaust valve (10), and a flue gas heat exchanger (15); the SCR reactor (4) is divided into j separate partitions, each partition is independent from the inlet to the outlet, each partition is connected with an original flue gas inlet and outlet baffle and a regeneration flue gas inlet and outlet valve; the induced draft fan (7), the regeneration flue gas inlet valve (9), the regeneration fan (6), the flue gas heat exchanger (15), the flue gas heater (5), and the regeneration flue gas inlet and outlet valves of each partition are connected in sequence; the regeneration flue gas inlet and outlet valves of each partition, the flue gas heat exchanger (15), the exhaust gas exhaust valve (10), and the original flue gas inlet of the desulfurization tower (1) are connected in sequence; wherein j ≥ 2 and j is an integer. 根据权利要求1所述的一种可原位再生的SCR反应器系统，其特征在于，还包括除尘器(2)，脱硫塔(1)、除尘器(2)、SCR反应器(4)沿原烟气流动方向依次连通。The in-situ regenerable SCR reactor system according to claim 1 is characterized in that it also includes a dust collector (2), and the desulfurization tower (1), the dust collector (2), and the SCR reactor (4) are connected in sequence along the original flue gas flow direction. 根据权利要求2所述的一种可原位再生的SCR反应器系统，其特征在于，还包括喷氨格栅(3)，脱硫塔(1)、除尘器(2)、喷氨格栅(3)、SCR反应器(4)沿原烟气流动方向依次连通。The in-situ regenerable SCR reactor system according to claim 2 is characterized in that it also includes an ammonia injection grid (3), and the desulfurization tower (1), the dust collector (2), the ammonia injection grid (3), and the SCR reactor (4) are connected in sequence along the original flue gas flow direction. 根据权利要求1所述的一种可原位再生的SCR反应器系统，其特征在于，还包括竖向隔板(16)，SCR反应器(4)通过竖向隔板(16)分为j个单独的分区。The in-situ regenerable SCR reactor system according to claim 1, characterized in that it also includes a vertical partition (16), and the SCR reactor (4) is divided into j separate partitions by the vertical partition (16). 根据权利要求1所述的一种可原位再生的SCR反应器系统，其特征在于，烟气加热器为电加热器、蒸汽加热器、热风炉中的一种或多种。The in-situ regenerable SCR reactor system according to claim 1, characterized in that the flue gas heater is one or more of an electric heater, a steam heater, and a hot air furnace. 根据权利要求1至5任一项所述的一种可原位再生的SCR反应器系统，其特征在于，还包括烟囱(8)，SCR反应器(4)、引风机(7)、烟囱(8)依次连通。An in-situ regenerable SCR reactor system according to any one of claims 1 to 5, characterized in that it also comprises a chimney (8), and the SCR reactor (4), the induced draft fan (7) and the chimney (8) are connected in sequence. 根据权利要求6所述的一种可原位再生的SCR反应器系统，其特征在于，2≤j≤10。The in-situ regenerable SCR reactor system according to claim 6, characterized in that 2≤j≤10. 一种可原位再生的SCR反应器系统的使用方法，其特征在于，采用权利要求1至7任一项所述的一种可原位再生的SCR反应器系统，在第i个分区催化剂被沾污、需要进行催化剂再生时，则调整第i分区原烟气进出口挡板至关闭状态，其余分区进出口挡板保持开启；A method for using an in-situ regenerable SCR reactor system, characterized in that the in-situ regenerable SCR reactor system according to any one of claims 1 to 7 is used, and when the catalyst in the i-th partition is contaminated and needs to be regenerated, the original flue gas inlet and outlet dampers of the i-th partition are adjusted to a closed state, and the inlet and outlet dampers of the other partitions are kept open; 开启再生烟气入口阀门(9)、废气排气阀门(10)，开启第i分区再生烟气进出口阀，其余分区的再生烟气进出口阀保持关闭，启动烟气加热器(5)和再生风机(6)；Open the regeneration flue gas inlet valve (9) and the exhaust gas exhaust valve (10), open the regeneration flue gas inlet and outlet valves of the i-th zone, keep the regeneration flue gas inlet and outlet valves of the other zones closed, and start the flue gas heater (5) and the regeneration fan (6); 净化烟气经烟气换热器(15)和烟气加热器(5)加热至再生所需温度，然后进入第i分区，第i分区催化剂上附着的硫酸氢铵发生气化、分解，硫酸氢铵分解为硫化物和氨气，被硫酸氢铵吸附的颗粒物也会脱附并被释放；The purified flue gas is heated to the temperature required for regeneration by the flue gas heat exchanger (15) and the flue gas heater (5), and then enters the i-th partition, where the ammonium bisulfate attached to the catalyst in the i-th partition is gasified and decomposed to decompose the ammonium bisulfate into sulfide and ammonia, and the particulate matter adsorbed by the ammonium bisulfate is also desorbed and released; 分解释放产生的烟气经烟气换热器(15)与再生风机(6)抽取的净烟气换热，降温后与原烟气混合，重新被引入到脱硫塔(1)的原烟气入口，完成烟气净化后，由引风机(7)排入大气；The flue gas generated by the decomposition and release is heat exchanged with the clean flue gas extracted by the regeneration fan (6) through the flue gas heat exchanger (15), mixed with the original flue gas after cooling, and reintroduced into the original flue gas inlet of the desulfurization tower (1). After the flue gas is purified, it is discharged into the atmosphere by the induced draft fan (7); 其中，i≤j。Among them, i≤j. 根据权利要求8所述的一种可原位再生的SCR反应器系统的使用方法，其特征在于，当第j个分区发生故障、需要对该分区停机检修时，则关闭该分区进出口挡板，对该分区进行检修，其他分区正常工作。The method for using an in-situ regenerable SCR reactor system according to claim 8 is characterized in that when a fault occurs in the jth partition and the partition needs to be shut down for maintenance, the inlet and outlet baffles of the partition are closed, the partition is repaired, and other partitions operate normally. 根据权利要求8或9所述的一种可原位再生的SCR反应器系统的使用方法，其特征在于，再生所需温度为350℃至400℃。 The method for using an in-situ regenerable SCR reactor system according to claim 8 or 9, characterized in that the temperature required for regeneration is 350° C. to 400° C.
PCT/CN2024/077514 2023-05-23 2024-02-19 Scr reactor system capable of realizing in-situ regeneration and method for using same Ceased WO2024239727A1 (en)

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