WO2021109448A1 - Self-resolving scr denitration system - Google Patents

Self-resolving scr denitration system Download PDF

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Publication number
WO2021109448A1
WO2021109448A1 PCT/CN2020/088946 CN2020088946W WO2021109448A1 WO 2021109448 A1 WO2021109448 A1 WO 2021109448A1 CN 2020088946 W CN2020088946 W CN 2020088946W WO 2021109448 A1 WO2021109448 A1 WO 2021109448A1
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WIPO (PCT)
Prior art keywords
flue
removal device
damper
main
dust removal
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PCT/CN2020/088946
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French (fr)
Chinese (zh)
Inventor
徐连春
王东
罗超
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南京凯盛国际工程有限公司
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Publication of WO2021109448A1 publication Critical patent/WO2021109448A1/en

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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
    • B01D53/90—Injecting reactants
    • 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
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8631—Processes characterised by a specific device
    • 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
    • F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
    • 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
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • 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
    • 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
    • F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • 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 invention relates to the technical field of flue gas purification, in particular to a self-analysis SCR denitration system.
  • the cement industry actively promotes the SCR denitration technology route.
  • the first solution is a high-temperature solution installed at the outlet of the preheating module. It can be subdivided into two types: “SCR flue gas denitration” high temperature and high dust solution and "Electrostatic precipitator + SCR flue gas denitration” high temperature medium dust solution; the second solution is the medium temperature solution installed after the waste heat power generation boiler, which is called "dust removal”.
  • the medium-temperature and low-dust program of “SCR + SCR flue gas denitrification” is more common; the third option is the “SCR flue gas denitrification” low temperature program installed after the dust collection in the kiln tail bag; the first option is for the production line of the 6-stage preheater.
  • Ammonium bisulfate has a higher risk of clogging the catalyst; for the production line of a 5-stage preheater with better heat consumption control, there is also a risk of ammonium bisulfate clogging the catalyst with the accumulation of time; in the second and third options In the scheme, the risk of ammonium bisulfate blocking the catalyst is very high.
  • the current SCR denitrification technical solution in the cement industry has two main problems: First, the generation of ammonium bisulfate adheres to the surface of the catalyst, which makes the catalyst passivation ineffective. In other industries such as coking, clean fuel burning is generally used.
  • the hot blast stove performs gasification analysis on the SCR reactor on a regular basis.
  • the commonly used fuel is water gas in the coking plant, but in the cement industry, the flue gas volume of the cement plant is about 10 times that of the coking plant, and the cement plant does not have a clean fuel similar to water gas.
  • the technical problem to be solved by the present invention is to provide a method that is beneficial to automatically resolve ammonium bisulfate when the catalyst is blocked by ammonium bisulfate to improve the denitration efficiency with low cost, and effectively reduce the dust content of the flue gas to reduce It is a self-analysis SCR denitrification system that has the possibility of clogging the catalyst by dust and at the same time improves the efficiency of online flue gas analysis of ammonium bisulfate.
  • a self-analysis SCR denitration system including a preheating component, a first raw material feeding device, a second raw material feeding device, a circulation component, and a primary pre-dust removal device ,
  • Two-stage fine dust removal device, spray device, SCR reactor and kiln dust collection device the discharge ports of the first raw meal feeding device and the second raw meal feeding device are all connected to the preheating assembly, which is characterized in that all
  • the air outlet of the first-level pre-dust removal device is connected to the air inlet of the second-level fine dust removal device;
  • the air inlet of the SCR reactor is connected to the air outlet of the second-level fine dust removal device;
  • the first-level pre-dust removal device, the second-level fine dust removal device The discharge port of the dust removal device and the SCR reactor are both connected to the kiln dust collection device, the spray device is arranged between the secondary fine dust removal device and the SCR reactor, and the discharge port of the spray device is
  • the circulation component includes a bypass flue, a first bypass damper, a main flue, a first main flue, a waste heat boiler, a first high temperature fan, and a dust collection device; one end of the main flue Connected to the air outlet of the first cyclone, the other end of the main road flue is connected to the air inlet of the primary pre-dust removal device, and the first main road damper is arranged on the main road flue; the bypass flue One end of the second cyclone is connected to the air outlet of the second cyclone, the other end of the bypass flue is also connected to the air inlet of the primary pre-dust removal device, and the first bypass damper is arranged on the bypass flue; the waste heat The air inlet of the boiler is connected with the air outlet of the SCR reactor, and the air outlet of the waste heat boiler is connected with the dust collector through the first high temperature fan.
  • the circulation assembly includes a bypass flue, a first bypass damper, a main flue, a first main flue, a waste heat boiler, a first high temperature fan, and a dust collection device; one end of the main flue Connected to the air outlet of the first cyclone, the other end of the main road flue is connected to the air inlet of the primary pre-dust removal device, and the first main road damper is arranged on the main road flue; the bypass flue One end of is connected to the air outlet of the second cyclone, the first bypass damper is arranged on the bypass flue; the waste heat boiler and the high-temperature fan are both installed on the main flue and downstream of the first main flue Side; the high-temperature fan is provided on the downstream side of the waste heat boiler, and the dust collection device is connected to the air outlet of the SCR reactor.
  • the circulation assembly further includes a second main road damper, the second main road damper is arranged on the main road flue and between the waste heat boiler and the high-temperature fan, and the other end of the bypass flue is connected to The flue to the main road is arranged between the air door of the second main road and the high-temperature fan.
  • the circulation component includes a bypass flue, a first bypass damper, a main flue, a first main flue, a waste heat boiler, a first high temperature fan, and a dust collection device; one end of the main flue Connected to the air outlet of the first cyclone, the other end of the main flue is connected to the air inlet of the SCR reactor and is arranged on the upstream side of the spray device, and the first main flue is arranged on the main flue,
  • the waste heat boiler, the high temperature fan and the dust collecting device are arranged on the main flue in sequence along the flue gas flow direction and are all arranged on the downstream side of the first main flue door.
  • One end of the bypass flue is connected to the second cyclone.
  • the air outlet is connected, the other end of the bypass flue is connected to the air inlet of the first-stage pre-dust removal device, and the first bypass damper is arranged on the bypass flue.
  • the circulation assembly further includes a second bypass damper, a third main road damper, and a second high-temperature fan;
  • the third main road damper is arranged on the main road flue and on the downstream side of the dust collection device, so The second high temperature fan and the second bypass damper are sequentially arranged between the other end of the main flue duct and the air outlet of the secondary fine dust removal device along the flow direction of the flue gas.
  • the advantages of the present invention are: the present invention effectively increases the outlet flue gas temperature of the preheating assembly through the conversion of the feeding mode and the air outlet mode, which is beneficial to automatically resolve the sulfuric acid when the ammonium bisulfate blocks the catalyst.
  • Ammonium hydrogen is used to improve the efficiency of denitration and has a low cost; in addition, by installing a first-level pre-dust removal device and or a second-level fine dust removal device, the dust content of the flue gas can be effectively reduced, and the possibility of dust blocking the catalyst is reduced; at the same time, online flue gas analysis is improved
  • the efficiency of ammonium bisulfate can effectively ensure that the flue gas stably meets the environmental emission targets, and has significant economic and social benefits.
  • Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention.
  • Figure 2 is a schematic structural diagram of Embodiment 2 of the present invention.
  • Figure 3 is a schematic structural diagram of Embodiment 3 of the present invention.
  • a self-analysis SCR denitration system includes a preheating component, a first raw material feeding device 2, a second raw material feeding device 3, a circulation component, a primary pre-dust removal device 8, and a secondary fine Dust removal device 9, spray device 10, SCR reactor 11 and kiln dust collection device 15;
  • the air outlet of the primary pre-dust removal device 8 is connected to the air inlet of the secondary fine dust removal device 9;
  • the air inlet of the SCR reactor 11 is connected to the secondary The outlet of the fine dust removal device 9 is connected;
  • the first-level pre-dust removal device 8, the second-level fine dust removal device 9 and the discharge port of the SCR reactor 11 are all connected to the kiln dust collection device 15, and the spray device 10 is set in the second-level fine dust removal device
  • the discharge port of the spray device 10 is connected to the air outlet of the secondary fine dust removal device 9,
  • the preheating component is connected to the primary pre-dust removal device 8 through the circulation component, the first raw meal feeding device 2 and
  • the preheating assembly includes a plurality of cyclones connected in series. It is the prior art.
  • the connection principle is as follows: the air outlet of the second cyclone C2 is connected with the air inlet of the first cyclone C1, and the discharge port of the first cyclone C1 is connected with the air inlet of the first cyclone C1.
  • the inlet of the second cyclone C2 is connected, the outlet of the third cyclone C3 is connected with the inlet of the second cyclone C2, and the outlet of the second cyclone C2 is connected with the inlet of the third cyclone C3 to
  • the outlet of the first raw meal feeding device 2 is connected to the air inlet of the first cyclone C1
  • the outlet of the second raw meal feeding device 3 is connected to the air inlet of the second cyclone C2.
  • the circulation components include the bypass flue 4, the first bypass damper 5, the main flue 6, the first main flue 7, the waste heat boiler 12, the first high temperature fan 13 and the dust collection device 14; the main flue 6 One end is connected to the air outlet of the first cyclone C1, the other end of the main road flue 6 is connected to the air inlet of the primary pre-dust removal device 8, and the first main road damper 7 is arranged on the main road flue 6; the bypass smoke One end of the duct 4 is connected to the air outlet of the second cyclone C2, the other end of the bypass flue 4 is also connected to the air inlet of the primary pre-dust removal device 8, and the first bypass damper 5 is arranged on the bypass flue 4.
  • the air inlet of the waste heat boiler 12 is connected to the air outlet of the SCR reactor 11, and the air outlet of the waste heat boiler 12 is connected to the dust collector 14 through the first high-temperature fan 13.
  • the temperature of the flue gas at the outlet of the first cyclone C1 is about 260°C
  • the temperature of the flue gas into the SCR reactor 11 is about 250°C; when the denitrification efficiency drops, that is, when the catalyst is blocked by ammonium bisulfate, there are three methods Can self-analyze ammonium bisulfate.
  • the first method Turn on the second raw meal feeding device 3, close the first raw meal feeding device 2, and the rest of the operation is the same as in normal operation.
  • the outlet flue gas temperature of the preheating component is about 320°C, and the flue gas reaches about 320°C.
  • the temperature of the SCR reactor 11 is about 310°C, and the increase in temperature can automatically resolve the ammonium bisulfate adhering to the catalyst.
  • the second method while maintaining normal operation, turn on the first raw meal feeding device 2 and shut down the second raw meal feeding device 3, open both the first main road damper 7 and the first bypass damper 5 but adjust To achieve a smaller flux, the outlet flue gas temperature of the preheating assembly can be smoothly adjusted to about 320-400°C.
  • the third method turn on the first raw meal feeding device 2 and the second raw meal feeding device 3 at the same time, and open both the first main road damper 7 and the first bypass damper 5 but adjust to a smaller flux , So as to smoothly adjust the outlet temperature of the preheating assembly to about 320-400°C.
  • the temperature of the flue gas at the outlet of the first cyclone C1 is about 300°C
  • the temperature of the flue gas entering the SCR reactor 11 is about 290°C
  • the catalyst is blocked by ammonium bisulfate
  • a self-analysis SCR denitration system includes a preheating component, a first raw material feeding device 2, a second raw material feeding device 3, a circulation component, a primary pre-dust removal device 8, and a secondary fine Dust removal device 9, spray device 10, SCR reactor 11 and kiln dust collection device 15;
  • the air outlet of the primary pre-dust removal device 8 is connected to the air inlet of the secondary fine dust removal device 9;
  • the air inlet of the SCR reactor 11 is connected to the secondary The outlet of the fine dust removal device 9 is connected;
  • the first level pre-dust removal device 8, the second level fine dust removal device 9 and the discharge port of the SCR reactor 11 are all connected to the kiln dust collection device 15, and the spray device 10 is set in the second level fine dust removal device
  • the discharge port of the spray device 10 is connected to the air outlet of the secondary fine dust removal device 9, the preheating component is connected to the primary pre-dust removal device 8 through the circulation component, the first raw meal feeding device 2 and the discharge port
  • the preheating assembly includes a plurality of cyclones connected in series. It is the prior art.
  • the connection principle is as follows: the air outlet of the second cyclone C2 is connected with the air inlet of the first cyclone C1, and the discharge port of the first cyclone C1 is connected with the air inlet of the first cyclone C1.
  • the inlet of the second cyclone C2 is connected, the outlet of the third cyclone C3 is connected with the inlet of the second cyclone C2, and the outlet of the second cyclone C2 is connected with the inlet of the third cyclone C3 to
  • the outlet of the first raw meal feeding device 2 is connected to the air inlet of the first cyclone C1
  • the outlet of the second raw meal feeding device 3 is connected to the air inlet of the second cyclone C2.
  • the circulation components include the bypass flue 4, the first bypass damper 5, the main flue 6, the first main flue 7, the waste heat boiler 12, the first high temperature fan 13 and the dust collection device 14; the main flue 6 One end is connected to the air outlet of the first cyclone C1, the other end of the main road flue 6 is connected to the air inlet of the primary pre-dust removal device 8, and the first main road damper 7 is arranged on the main road flue 6; the bypass smoke One end of the duct 4 is connected with the air outlet of the second cyclone C2, the first bypass damper 5 is arranged on the bypass flue 4; the waste heat boiler 12 and the high temperature fan 13 are both arranged on the main flue 6 and arranged on the second A downstream side of the main road damper 7; the high temperature fan 13 is arranged on the downstream side of the waste heat boiler 12; the circulation assembly also includes a second main road damper 7-1, which is arranged on the main road flue 6 It is arranged between the waste heat boiler 12 and the high temperature fan 13, and the other end
  • This embodiment is suitable for when the SCR reactor 11 is in a medium-temperature working condition, and during normal operation, the temperature of the flue gas into the SCR reactor 11 is about 200°C; the flue gas comes out of the air outlet of the first cyclone C1 and passes through the main One end of the road flue 6 flows through the waste heat boiler 12, and then flows through the primary pre-dust removal device 8, the secondary fine dust removal device 9, the SCR reactor 11 and the dust collection device 14 in sequence.
  • the first method turn on the second raw meal feeding device 3, turn off the first raw meal feeding device 2, and the rest of the operation is the same as in normal operation.
  • the outlet flue gas temperature of the preheating assembly is about 220 °C, and the flue gas reaches
  • the temperature of the SCR reactor 11 is about 200°C, and the increase in temperature can automatically resolve the ammonium bisulfate adhering to the catalyst.
  • the second method while maintaining normal operation, turn on the first raw meal feeding device 2 and shut down the second raw meal feeding device 3, and connect the first main road damper 7, the second main road damper 7-1 and the bypass
  • the dampers 5 are all opened but adjusted to a small flux, so that the outlet flue gas temperature of the preheating assembly is smoothly adjusted to about 200°C.
  • the third method Turn on the first raw meal feeding device 2 and the second raw meal feeding device 3 at the same time, and open the first main road damper 7, the second main road damper 7-1 and the bypass damper 5, but both Adjust to a smaller flux, so as to smoothly adjust the outlet temperature of the preheating assembly to about 200°C.
  • a self-analysis SCR denitration system includes a preheating component, a first raw material feeding device 2, a second raw material feeding device 3, a circulation component, a primary pre-dust removal device 8, and a secondary fine Dust removal device 9, spray device 10, SCR reactor 11 and kiln dust collection device 15;
  • the air outlet of the primary pre-dust removal device 8 is connected to the air inlet of the secondary fine dust removal device 9;
  • the air inlet of the SCR reactor 11 is connected to the secondary The outlet of the fine dust removal device 9 is connected;
  • the first level pre-dust removal device 8, the second level fine dust removal device 9 and the discharge port of the SCR reactor 11 are all connected to the kiln dust collection device 15, and the spray device 10 is set in the second level fine dust removal device
  • the discharge port of the spray device 10 is connected to the air outlet of the secondary fine dust removal device 9, the preheating component is connected to the primary pre-dust removal device 8 through the circulation component, the first raw meal feeding device 2 and the discharge port
  • the preheating assembly includes a plurality of cyclones connected in series. It is the prior art.
  • the connection principle is as follows: the air outlet of the second cyclone C2 is connected with the air inlet of the first cyclone C1, and the discharge port of the first cyclone C1 is connected with the air inlet of the first cyclone C1.
  • the inlet of the second cyclone C2 is connected, the outlet of the third cyclone C3 is connected with the inlet of the second cyclone C2, and the outlet of the second cyclone C2 is connected with the inlet of the third cyclone C3 to
  • the outlet of the first raw meal feeding device 2 is connected to the air inlet of the first cyclone C1
  • the outlet of the second raw meal feeding device 3 is connected to the air inlet of the second cyclone C2.
  • the circulation components include the bypass flue 4, the first bypass damper 5, the main flue 6, the first main flue 7, the waste heat boiler 12, the first high temperature fan 13 and the dust collection device 14; the main flue 6 One end is connected to the air outlet of the first cyclone C1, the other end of the main flue 6 is connected to the air inlet of the SCR reactor 11 and is arranged on the upstream side of the spray device 10, and the first main air damper 7 is arranged on the main flue On the duct 6, the waste heat boiler 12, the high temperature fan 13 and the dust collecting device 14 are arranged in the main flue 6 in sequence along the flue gas flow direction, and they are all arranged on the downstream side of the first main duct damper 7, and the bypass flue 4 One end is connected to the air outlet of the second cyclone C2, the other end of the bypass flue 4 is connected to the air inlet of the primary pre-dust removal device 8, and the first bypass damper 5 is arranged on the bypass flue 4; Including the second bypass damper 5-1, the third main
  • This embodiment is suitable for when the SCR reactor 11 is in a low temperature SCR condition, and the temperature of the flue gas to the SCR reactor 11 is about 100-160°C during normal operation, the first main road damper 7 and the third main road damper are opened. 7-2 and the second bypass damper 5-1, when the flue gas exits the air outlet of the first cyclone C1, it enters the main flue duct 6, and is driven by the high-temperature fan 13 to flow through the waste heat boiler 12 and After the dust collection device 14 enters the SCR reactor 11; the flue gas from the air outlet of the second cyclone C2 is driven by the second high-temperature fan 13 and flows through the primary pre-dust removal device 8 and the second pre-dust removal device 8 through the bypass flue 4 in turn. After the fine dust removal device 9 also enters the SCR reactor 11.
  • the first method Turn on the second raw meal feeding device 3, close the first raw meal feeding device 2, and the rest of the operation is the same as in normal operation.
  • the outlet flue gas temperature of the preheating component is about 320°C, and the flue gas reaches about 320°C.
  • the temperature of the SCR reactor 11 is about 310°C, and the increase in temperature can automatically resolve the ammonium bisulfate adhering to the catalyst.
  • the second method While maintaining normal operation, turn on the first raw meal feeding device 2 and shut down the second raw meal feeding device 3, and set the first main road damper 7, the third main road damper 7-2, and the second main road damper 7-2.
  • the bypass damper 5-1 and the first bypass damper 5 are both opened but adjusted to a smaller flux, so that the outlet flue gas temperature of the preheating assembly is smoothly adjusted to about 100-160°C.
  • the third method turn on the first raw meal feeding device 2 and the second raw meal feeding device 3 at the same time, and the first main road damper 7, the third main road damper 7-2, and the second bypass damper 5 1 and the first bypass damper 5 are both opened but adjusted to a smaller flux, so that the outlet temperature of the preheating assembly is smoothly adjusted to about 100-160°C.
  • the SCR reactor 11 is always arranged after the first-stage pre-dust removal device 8 and the second-stage fine dust removal device 9 connected in series to reduce the dust content in the flue gas entering the SCR reactor 11 and solve the dust concentration in the high dust solution High problem; the installation of a first-level pre-dust removal device 8 in front of the second-level fine dust removal device 9 can alleviate the problem of high dust concentration at the reactor inlet caused by the tripping of the second-level fine dust removal device 9, thereby alleviating the risk of dust clogging of the catalyst; On-line flue gas enters the SCR reactor 11 to resolve the efficiency of ammonium bisulfate.
  • the present invention effectively increases the outlet flue gas temperature of the preheating assembly through the conversion of the feeding mode and the air outlet mode, which is beneficial to automatically analyze the ammonium bisulfate when the ammonium bisulfate blocks the catalyst to improve the denitrification efficiency, and the cost is low;
  • the first-level pre-dust removal device and the second-level fine dust removal device are installed to effectively reduce the dust content of the flue gas and reduce the possibility of dust clogging the catalyst; at the same time, the efficiency of online flue gas analysis of ammonium bisulfate is improved, so as to effectively ensure that the flue gas is stable Reaching environmental protection emission targets has significant economic and social benefits.

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Abstract

Provided is a self-resolving SCR denitration system, comprising a preheating assembly, a first raw material feeding device (2), a second raw material feeding device (3), a circulation assembly, a primary pre-dust-removal device (8), a secondary fine dust-removal device (9), a spraying device (10), an SCR reactor (11), and a kiln dust collecting device (15); an air outlet of the primary pre-dust-removal device (8) is connected to an air inlet of the secondary fine dust-removal device (9); an air inlet of the SCR reactor (11) is connected to an air outlet of the secondary fine dust-removal device (9); discharge ports of the primary pre-dust-removal device (8), the secondary fine dust-removal device (9) and the SCR reactor (11) are all connected to the kiln dust collecting device (15), the spraying device (10) is provided between the secondary fine dust-removal device (9) and the SCR reactor (11), a discharge port of the spraying device (10) is connected to the discharge port of the secondary fine dust-removal device (9), and the preheating assembly is connected to the primary pre-dust-removal device (8) by means of the circulation assembly. The described system effectively improves the air temperature of outlet flue gas of the preheating assembly, facilitating automatic desorption of ammonium bisulfate when a catalyst is blocked by the ammonium bisulfate, so as to improve denitration efficiency.

Description

一种自解析SCR脱硝***A self-analysis SCR denitration system 技术领域Technical field
本发明涉及烟气净化技术领域，尤其涉及一种自解析SCR脱硝***。The invention relates to the technical field of flue gas purification, in particular to a self-analysis SCR denitration system.
背景技术Background technique
随着国家对环保要求的提高，水泥企业氮氧化物的排放标准也随之提高，各地区积极响应国家倡导，目标是控制氮氧化物的排放在100mg/m3以下，同时氨逃逸不超过8mg/Nm3。As the country's environmental protection requirements increase, the emission standards of nitrogen oxides for cement companies have also increased. All regions actively respond to national advocacy. The goal is to control the emission of nitrogen oxides below 100mg/m3, while ammonia escape does not exceed 8mg/ Nm3.
为了保证氮氧化物的排放达标的同时，氨逃逸也达到国际标准，水泥行业积极推广SCR脱硝技术路线，主要有如下三种方案：第一种方案是安装在预热组件出口的高温方案，其中可以细分为“SCR烟气脱硝”高温高尘方案和“电除尘器+SCR烟气脱硝”高温中尘方案两种；第二种方案是安装在余热发电锅炉后的中温方案，以“除尘器+SCR烟气脱硝”中温低尘方案较为常见；第三种方案是安装在窑尾袋收尘之后的“SCR烟气脱硝”低温方案；第一种方案对于6级预热器的生产线，硫酸氢铵堵塞催化剂的风险较高；对于生产热耗控制较好的5级预热器的生产线，随着时间的积累也存在硫酸氢铵堵塞催化剂的风险；在第二种方案和第三种方案中，硫酸氢铵堵塞催化剂的风险非常高。In order to ensure that the emission of nitrogen oxides meets the standards, while the ammonia escape also meets the international standards, the cement industry actively promotes the SCR denitration technology route. There are three main solutions: the first solution is a high-temperature solution installed at the outlet of the preheating module. It can be subdivided into two types: "SCR flue gas denitration" high temperature and high dust solution and "Electrostatic precipitator + SCR flue gas denitration" high temperature medium dust solution; the second solution is the medium temperature solution installed after the waste heat power generation boiler, which is called "dust removal". The medium-temperature and low-dust program of “SCR + SCR flue gas denitrification” is more common; the third option is the “SCR flue gas denitrification” low temperature program installed after the dust collection in the kiln tail bag; the first option is for the production line of the 6-stage preheater. Ammonium bisulfate has a higher risk of clogging the catalyst; for the production line of a 5-stage preheater with better heat consumption control, there is also a risk of ammonium bisulfate clogging the catalyst with the accumulation of time; in the second and third options In the scheme, the risk of ammonium bisulfate blocking the catalyst is very high.
总体来讲，目前的水泥行业SCR脱硝技术方案主要存在两个问题：首先，是生成硫酸氢铵粘附在催化剂表面，使催化剂钝化失效，在焦化等其他行业，一般会采用燃烧清洁燃料的热风炉定期对SCR反应器进行气化解析，常用的燃料是焦化厂内的水煤气等，但是在水泥行业，水泥厂烟气量是焦化厂的10倍左右，而且水泥厂没有类似水煤气的清洁燃料，如燃烧天燃气，成本非常高，而且大部分厂不具备配套清洁燃料热风炉的条件；其次，是粉尘堵塞催化剂，并且粉尘中的CaO与SO3反应形成的CaSO4吸附在催化剂表面，会阻止反应物向 催化剂表面扩散并进入催化剂内部，导致脱硝效率下降，此外，催化剂损耗也较高；因此，有待于进一步改进。Generally speaking, the current SCR denitrification technical solution in the cement industry has two main problems: First, the generation of ammonium bisulfate adheres to the surface of the catalyst, which makes the catalyst passivation ineffective. In other industries such as coking, clean fuel burning is generally used. The hot blast stove performs gasification analysis on the SCR reactor on a regular basis. The commonly used fuel is water gas in the coking plant, but in the cement industry, the flue gas volume of the cement plant is about 10 times that of the coking plant, and the cement plant does not have a clean fuel similar to water gas. , Such as burning natural gas, the cost is very high, and most factories do not have the conditions for supporting clean fuel hot blast stoves; secondly, the catalyst is blocked by dust, and the CaSO4 formed by the reaction of CaO and SO3 in the dust is adsorbed on the surface of the catalyst, which will prevent the reaction The substance diffuses to the surface of the catalyst and enters the inside of the catalyst, resulting in a decrease in the denitration efficiency. In addition, the loss of the catalyst is also high; therefore, further improvement is needed.
发明内容Summary of the invention
针对上述现有技术的现状，本发明所要解决的技术问题在于提供一种利于在硫酸氢铵堵塞催化剂时自动解析硫酸氢铵以提高脱硝效率且成本低，并有效降低烟气含尘量以降低粉尘堵塞催化剂的可能性，同时提高了在线烟气解析硫酸氢铵的效率的自解析SCR脱硝***。In view of the above-mentioned current status of the prior art, the technical problem to be solved by the present invention is to provide a method that is beneficial to automatically resolve ammonium bisulfate when the catalyst is blocked by ammonium bisulfate to improve the denitration efficiency with low cost, and effectively reduce the dust content of the flue gas to reduce It is a self-analysis SCR denitrification system that has the possibility of clogging the catalyst by dust and at the same time improves the efficiency of online flue gas analysis of ammonium bisulfate.
本发明解决上述技术问题所采用的技术方案为：一种自解析SCR脱硝***，包括预热组件、第一生料喂料装置、第二生料喂料装置、流通组件、一级预除尘装置、二级精除尘装置、喷射装置、SCR反应器和窑灰收集装置，第一生料喂料装置和第二生料喂料装置的出料口均与预热组件相连，其特征在于，所述一级预除尘装置的出风口与二级精除尘装置的进风口相连；所述SCR反应器的进风口与二级精除尘装置的出风口相连；所述一级预除尘装置、二级精除尘装置和SCR反应器的出料口均与窑灰收集装置相连，所述喷射装置设置在二级精除尘装置和SCR反应器之间，所述喷射装置的出料口与二级精除尘装置的出风口相连，所述预热组件通过流通组件与一级预除尘装置相连。The technical solution adopted by the present invention to solve the above technical problems is: a self-analysis SCR denitration system, including a preheating component, a first raw material feeding device, a second raw material feeding device, a circulation component, and a primary pre-dust removal device , Two-stage fine dust removal device, spray device, SCR reactor and kiln dust collection device, the discharge ports of the first raw meal feeding device and the second raw meal feeding device are all connected to the preheating assembly, which is characterized in that all The air outlet of the first-level pre-dust removal device is connected to the air inlet of the second-level fine dust removal device; the air inlet of the SCR reactor is connected to the air outlet of the second-level fine dust removal device; the first-level pre-dust removal device, the second-level fine dust removal device The discharge port of the dust removal device and the SCR reactor are both connected to the kiln dust collection device, the spray device is arranged between the secondary fine dust removal device and the SCR reactor, and the discharge port of the spray device is connected to the secondary fine dust removal device The air outlet is connected, and the preheating component is connected to the primary pre-dust removal device through the circulation component.
优选地，所述流通组件包括旁路烟道、第一旁路风门、主路烟道、第一主路风门、余热锅炉、第一高温风机和收尘装置；所述主路烟道的一端与第一旋风筒的出风口相连，所述主路烟道的另一端与一级预除尘装置的进风口相连，所述第一主路风门设置在主路烟道上；所述旁路烟道的一端与第二旋风筒的出风口相连，所述旁路烟道的另一端也与一级预除尘装置的进风口相连，所述第一旁路风门设置在旁路烟道上；所述余热锅炉的进风口与SCR反应器的出风口相连，所述余热锅炉的出风口通过第一高温风机与收尘装置相连。Preferably, the circulation component includes a bypass flue, a first bypass damper, a main flue, a first main flue, a waste heat boiler, a first high temperature fan, and a dust collection device; one end of the main flue Connected to the air outlet of the first cyclone, the other end of the main road flue is connected to the air inlet of the primary pre-dust removal device, and the first main road damper is arranged on the main road flue; the bypass flue One end of the second cyclone is connected to the air outlet of the second cyclone, the other end of the bypass flue is also connected to the air inlet of the primary pre-dust removal device, and the first bypass damper is arranged on the bypass flue; the waste heat The air inlet of the boiler is connected with the air outlet of the SCR reactor, and the air outlet of the waste heat boiler is connected with the dust collector through the first high temperature fan.
优选地，所述流通组件包括旁路烟道、第一旁路风门、主路烟道、 第一主路风门、余热锅炉、第一高温风机和收尘装置；所述主路烟道的一端与第一旋风筒的出风口相连，所述主路烟道的另一端与一级预除尘装置的进风口相连，所述第一主路风门设置在主路烟道上；所述旁路烟道的一端与第二旋风筒的出风口相连，所述第一旁路风门设置在旁路烟道上；所述余热锅炉和高温风机均设置在主路烟道上并设于第一主路风门的下游侧；所述高温风机设于余热锅炉的下游侧，所述收尘装置连接在SCR反应器的出风口上。Preferably, the circulation assembly includes a bypass flue, a first bypass damper, a main flue, a first main flue, a waste heat boiler, a first high temperature fan, and a dust collection device; one end of the main flue Connected to the air outlet of the first cyclone, the other end of the main road flue is connected to the air inlet of the primary pre-dust removal device, and the first main road damper is arranged on the main road flue; the bypass flue One end of is connected to the air outlet of the second cyclone, the first bypass damper is arranged on the bypass flue; the waste heat boiler and the high-temperature fan are both installed on the main flue and downstream of the first main flue Side; the high-temperature fan is provided on the downstream side of the waste heat boiler, and the dust collection device is connected to the air outlet of the SCR reactor.
优选地，所述流通组件还包括第二主路风门，所述第二主路风门设置在主路烟道上并设于余热锅炉和高温风机之间，所述旁路烟道的另一端接入到主路烟道上并设于第二主路风门和高温风机之间。Preferably, the circulation assembly further includes a second main road damper, the second main road damper is arranged on the main road flue and between the waste heat boiler and the high-temperature fan, and the other end of the bypass flue is connected to The flue to the main road is arranged between the air door of the second main road and the high-temperature fan.
优选地，所述流通组件包括旁路烟道、第一旁路风门、主路烟道、第一主路风门、余热锅炉、第一高温风机和收尘装置；所述主路烟道的一端与第一旋风筒的出风口相连，所述主路烟道的另一端与SCR反应器的进风口相连并设于喷射装置的上游侧，所述第一主路风门设置在主路烟道上，所述余热锅炉、高温风机和收尘装置沿烟气流动方向依次设在主路烟道上并均设于第一主路风门的下游侧，所述旁路烟道的一端与第二旋风筒的出风口相连，所述旁路烟道的另一端与一级预除尘装置的进风口相连，所述第一旁路风门设置在旁路烟道上。Preferably, the circulation component includes a bypass flue, a first bypass damper, a main flue, a first main flue, a waste heat boiler, a first high temperature fan, and a dust collection device; one end of the main flue Connected to the air outlet of the first cyclone, the other end of the main flue is connected to the air inlet of the SCR reactor and is arranged on the upstream side of the spray device, and the first main flue is arranged on the main flue, The waste heat boiler, the high temperature fan and the dust collecting device are arranged on the main flue in sequence along the flue gas flow direction and are all arranged on the downstream side of the first main flue door. One end of the bypass flue is connected to the second cyclone. The air outlet is connected, the other end of the bypass flue is connected to the air inlet of the first-stage pre-dust removal device, and the first bypass damper is arranged on the bypass flue.
优选地，所述流通组件还包括第二旁路风门、第三主路风门和第二高温风机；所述第三主路风门设置在主路烟道上并设于收尘装置的下游侧，所述第二高温风机和第二旁路风门沿烟气流动方向依次设置在主路烟道的另一端与二级精除尘装置的出风口之间。Preferably, the circulation assembly further includes a second bypass damper, a third main road damper, and a second high-temperature fan; the third main road damper is arranged on the main road flue and on the downstream side of the dust collection device, so The second high temperature fan and the second bypass damper are sequentially arranged between the other end of the main flue duct and the air outlet of the secondary fine dust removal device along the flow direction of the flue gas.
与现有技术相比，本发明的优点在于：本发明通过喂料方式和出风方式的转换，有效提高了预热组件的出口烟气风温，利于在硫酸氢铵堵塞催化剂时自动解析硫酸氢铵以提高脱硝效率，成本低；另外，通过设置一级预除尘装置和或二级精除尘装置，有效降低烟气含尘量，降低粉尘堵塞催化剂的可能性；同时提高了在线烟气解析硫酸氢 铵的效率，从而有效保证烟气稳定地达到环保排放指标，具有显著的经济效益和社会效益。Compared with the prior art, the advantages of the present invention are: the present invention effectively increases the outlet flue gas temperature of the preheating assembly through the conversion of the feeding mode and the air outlet mode, which is beneficial to automatically resolve the sulfuric acid when the ammonium bisulfate blocks the catalyst. Ammonium hydrogen is used to improve the efficiency of denitration and has a low cost; in addition, by installing a first-level pre-dust removal device and or a second-level fine dust removal device, the dust content of the flue gas can be effectively reduced, and the possibility of dust blocking the catalyst is reduced; at the same time, online flue gas analysis is improved The efficiency of ammonium bisulfate can effectively ensure that the flue gas stably meets the environmental emission targets, and has significant economic and social benefits.
附图说明Description of the drawings
图1为本发明实施例1的结构原理图；Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;
图2为本发明实施例2的结构原理图；Figure 2 is a schematic structural diagram of Embodiment 2 of the present invention;
图3为本发明实施例3的结构原理图。Figure 3 is a schematic structural diagram of Embodiment 3 of the present invention.
具体实施方式Detailed ways
实施例1：Example 1:
如图1所示，一种自解析SCR脱硝***，包括预热组件、第一生料喂料装置2、第二生料喂料装置3、流通组件、一级预除尘装置8、二级精除尘装置9、喷射装置10、SCR反应器11和窑灰收集装置15；一级预除尘装置8的出风口与二级精除尘装置9的进风口相连；SCR反应器11的进风口与二级精除尘装置9的出风口相连；一级预除尘装置8、二级精除尘装置9和SCR反应器11的出料口均与窑灰收集装置15相连，喷射装置10设置在二级精除尘装置9和SCR反应器11之间，喷射装置10的出料口与二级精除尘装置9的出风口相连，预热组件通过流通组件与一级预除尘装置8相连，第一生料喂料装置2和第二生料喂料装置3的出料口均与预热组件相连。As shown in Figure 1, a self-analysis SCR denitration system includes a preheating component, a first raw material feeding device 2, a second raw material feeding device 3, a circulation component, a primary pre-dust removal device 8, and a secondary fine Dust removal device 9, spray device 10, SCR reactor 11 and kiln dust collection device 15; the air outlet of the primary pre-dust removal device 8 is connected to the air inlet of the secondary fine dust removal device 9; the air inlet of the SCR reactor 11 is connected to the secondary The outlet of the fine dust removal device 9 is connected; the first-level pre-dust removal device 8, the second-level fine dust removal device 9 and the discharge port of the SCR reactor 11 are all connected to the kiln dust collection device 15, and the spray device 10 is set in the second-level fine dust removal device Between 9 and SCR reactor 11, the discharge port of the spray device 10 is connected to the air outlet of the secondary fine dust removal device 9, the preheating component is connected to the primary pre-dust removal device 8 through the circulation component, the first raw meal feeding device 2 and the discharge port of the second raw meal feeding device 3 are both connected with the preheating assembly.
预热组件包括多个相互串联的旋风筒，为现有技术，连接原理如下：第二旋风筒C2的出风口与第一旋风筒C1的进风口相连，第一旋风筒C1的出料口与第二旋风筒C2的进风口相连，第三旋风筒C3的出风口与第二旋风筒C2的进风口相连，第二旋风筒C2的出料口与第三旋风筒C3的进风口相连，以此类推；第一生料喂料装置2的出料口与第一旋风筒C1的进风口相连，第二生料喂料装置3的出料口与第二旋风筒C2的进风口相连。The preheating assembly includes a plurality of cyclones connected in series. It is the prior art. The connection principle is as follows: the air outlet of the second cyclone C2 is connected with the air inlet of the first cyclone C1, and the discharge port of the first cyclone C1 is connected with the air inlet of the first cyclone C1. The inlet of the second cyclone C2 is connected, the outlet of the third cyclone C3 is connected with the inlet of the second cyclone C2, and the outlet of the second cyclone C2 is connected with the inlet of the third cyclone C3 to By analogy; the outlet of the first raw meal feeding device 2 is connected to the air inlet of the first cyclone C1, and the outlet of the second raw meal feeding device 3 is connected to the air inlet of the second cyclone C2.
流通组件包括旁路烟道4、第一旁路风门5、主路烟道6、第一主路风门7、余热锅炉12、第一高温风机13和收尘装置14；主路烟道6的一端与第一旋风筒C1的出风口相连，主路烟道6的另一端与 一级预除尘装置8的进风口相连，第一主路风门7设置在主路烟道6上；旁路烟道4的一端与第二旋风筒C2的出风口相连，旁路烟道4的另一端也与一级预除尘装置8的进风口相连，第一旁路风门5设置在旁路烟道4上；余热锅炉12的进风口与SCR反应器11的出风口相连，余热锅炉12的出风口通过第一高温风机13与收尘装置14相连。The circulation components include the bypass flue 4, the first bypass damper 5, the main flue 6, the first main flue 7, the waste heat boiler 12, the first high temperature fan 13 and the dust collection device 14; the main flue 6 One end is connected to the air outlet of the first cyclone C1, the other end of the main road flue 6 is connected to the air inlet of the primary pre-dust removal device 8, and the first main road damper 7 is arranged on the main road flue 6; the bypass smoke One end of the duct 4 is connected to the air outlet of the second cyclone C2, the other end of the bypass flue 4 is also connected to the air inlet of the primary pre-dust removal device 8, and the first bypass damper 5 is arranged on the bypass flue 4. The air inlet of the waste heat boiler 12 is connected to the air outlet of the SCR reactor 11, and the air outlet of the waste heat boiler 12 is connected to the dust collector 14 through the first high-temperature fan 13.
工艺流程：当SCR反应器11处于高温工况时，打开第一主路风门7并启动第一生料喂料装置2进料，关闭第一旁路风门5并关停第二生料喂料装置3；高温水泥窑的烟气从第三旋风筒C3的进风口进入第三旋风筒C3内部，再进入第二旋风筒C2内部，最后从第一旋风筒C1的出风口出来后经由主路烟道6进入一级预除尘装置8；一级预除尘装置8会对烟气进行第一级除尘，接着，烟气进入二级精除尘装置9进行第二级除尘；烟气从二级精除尘装置9的出风口出来时，喷射装置10向烟气喷射氨水，混有氨水的烟气进入SCR反应器11进行脱硝反应；一级预除尘装置8、二级精除尘装置9和SCR反应器11中产生的烟灰均排入到窑灰收集装置15中进行收集；从SCR反应器11出风口出来的烟气进入余热锅炉12以回收烟气中的残留热量，烟气在余热锅炉12中产生的烟灰在第一高温风机13的带动下进入收尘装置14中进行收集。Process flow: when the SCR reactor 11 is in a high temperature working condition, open the first main road damper 7 and start the first raw meal feeding device 2 to feed, close the first bypass damper 5 and shut down the second raw meal feeding Device 3; the flue gas from the high-temperature cement kiln enters the third cyclone C3 from the air inlet of the third cyclone C3, then enters the second cyclone C2, and finally exits the air outlet of the first cyclone C1 through the main road The flue 6 enters the first-level pre-dust removal device 8; the first-level pre-dust removal device 8 will perform the first-stage dust removal on the flue gas, and then, the flue gas enters the second-level fine dust removal device 9 for the second-stage dust removal; the flue gas is removed from the second-level fine dust removal device 9 When the air outlet of the dust removal device 9 comes out, the injection device 10 sprays ammonia water into the flue gas, and the flue gas mixed with ammonia water enters the SCR reactor 11 for denitration reaction; the first-level pre-dust removal device 8, the second-level fine dust removal device 9 and the SCR reactor The soot produced in 11 is discharged into the kiln dust collection device 15 for collection; the flue gas from the air outlet of the SCR reactor 11 enters the waste heat boiler 12 to recover the residual heat in the flue gas, and the flue gas is generated in the waste heat boiler 12 The soot is driven by the first high-temperature fan 13 into the dust collection device 14 for collection.
当第一旋风筒C1的出口烟气温度在260℃左右时，烟气到SCR反应器11内的温度约为250℃；当脱硝效率下降时，即当硫酸氢铵堵塞催化剂时，有三种方法可以自解析硫酸氢铵。When the temperature of the flue gas at the outlet of the first cyclone C1 is about 260°C, the temperature of the flue gas into the SCR reactor 11 is about 250°C; when the denitrification efficiency drops, that is, when the catalyst is blocked by ammonium bisulfate, there are three methods Can self-analyze ammonium bisulfate.
第一种方法：开启第二生料喂料装置3，关闭第一生料喂料装置2，其余操作与正常运行时保持一样，预热组件的出口烟气温度在320℃左右，烟气到SCR反应器11的温度约为310℃，温度的升高可以自动解析催化剂上粘附的硫酸氢铵。The first method: Turn on the second raw meal feeding device 3, close the first raw meal feeding device 2, and the rest of the operation is the same as in normal operation. The outlet flue gas temperature of the preheating component is about 320℃, and the flue gas reaches about 320℃. The temperature of the SCR reactor 11 is about 310°C, and the increase in temperature can automatically resolve the ammonium bisulfate adhering to the catalyst.
第二种方法：保持正常运行时，开启第一生料喂料装置2并关停第二生料喂料装置3，将第一主路风门7和第一旁路风门5均开启但 均调节到较小的通量，从而将预热组件的出口烟气温度平稳调整至320～400℃左右。The second method: while maintaining normal operation, turn on the first raw meal feeding device 2 and shut down the second raw meal feeding device 3, open both the first main road damper 7 and the first bypass damper 5 but adjust To achieve a smaller flux, the outlet flue gas temperature of the preheating assembly can be smoothly adjusted to about 320-400°C.
第三种方法：同时开启第一生料喂料装置2和第二生料喂料装置3，将第一主路风门7和第一旁路风门5均开启但均调节到较小的通量，从而将预热组件出口温度平稳调整至320～400℃左右。The third method: turn on the first raw meal feeding device 2 and the second raw meal feeding device 3 at the same time, and open both the first main road damper 7 and the first bypass damper 5 but adjust to a smaller flux , So as to smoothly adjust the outlet temperature of the preheating assembly to about 320-400°C.
当第一旋风筒C1的出口烟气温度在300℃左右，烟气进入到SCR反应器11内的温度约为290℃，并发现硫酸氢铵堵塞催化剂时，也有三种方法可以自解析硫酸氢铵；三种方法基本与出口烟气温度在260℃时的操作方法相同，不同点在于：采用第一种方法时，预热组件的出口烟气温度在360℃左右。When the temperature of the flue gas at the outlet of the first cyclone C1 is about 300°C, the temperature of the flue gas entering the SCR reactor 11 is about 290°C, and it is found that the catalyst is blocked by ammonium bisulfate, there are also three methods for self-resolving hydrogen sulfate Ammonium: The three methods are basically the same as the operating method when the outlet flue gas temperature is 260°C, but the difference is: when the first method is used, the outlet flue gas temperature of the preheating component is about 360°C.
实施例2：Example 2:
如图2所示，一种自解析SCR脱硝***，包括预热组件、第一生料喂料装置2、第二生料喂料装置3、流通组件、一级预除尘装置8、二级精除尘装置9、喷射装置10、SCR反应器11和窑灰收集装置15；一级预除尘装置8的出风口与二级精除尘装置9的进风口相连；SCR反应器11的进风口与二级精除尘装置9的出风口相连；一级预除尘装置8、二级精除尘装置9和SCR反应器11的出料口均与窑灰收集装置15相连，喷射装置10设置在二级精除尘装置9和SCR反应器11之间，喷射装置10的出料口与二级精除尘装置9的出风口相连，预热组件通过流通组件与一级预除尘装置8相连，第一生料喂料装置2和第二生料喂料装置3的出料口均与预热组件相连。As shown in Figure 2, a self-analysis SCR denitration system includes a preheating component, a first raw material feeding device 2, a second raw material feeding device 3, a circulation component, a primary pre-dust removal device 8, and a secondary fine Dust removal device 9, spray device 10, SCR reactor 11 and kiln dust collection device 15; the air outlet of the primary pre-dust removal device 8 is connected to the air inlet of the secondary fine dust removal device 9; the air inlet of the SCR reactor 11 is connected to the secondary The outlet of the fine dust removal device 9 is connected; the first level pre-dust removal device 8, the second level fine dust removal device 9 and the discharge port of the SCR reactor 11 are all connected to the kiln dust collection device 15, and the spray device 10 is set in the second level fine dust removal device Between 9 and SCR reactor 11, the discharge port of the spray device 10 is connected to the air outlet of the secondary fine dust removal device 9, the preheating component is connected to the primary pre-dust removal device 8 through the circulation component, the first raw meal feeding device 2 and the discharge port of the second raw meal feeding device 3 are both connected with the preheating assembly.
预热组件包括多个相互串联的旋风筒，为现有技术，连接原理如下：第二旋风筒C2的出风口与第一旋风筒C1的进风口相连，第一旋风筒C1的出料口与第二旋风筒C2的进风口相连，第三旋风筒C3的出风口与第二旋风筒C2的进风口相连，第二旋风筒C2的出料口与第三旋风筒C3的进风口相连，以此类推；第一生料喂料装置2的出料口与第一旋风筒C1的进风口相连，第二生料喂料装置3的出料口与 第二旋风筒C2的进风口相连。The preheating assembly includes a plurality of cyclones connected in series. It is the prior art. The connection principle is as follows: the air outlet of the second cyclone C2 is connected with the air inlet of the first cyclone C1, and the discharge port of the first cyclone C1 is connected with the air inlet of the first cyclone C1. The inlet of the second cyclone C2 is connected, the outlet of the third cyclone C3 is connected with the inlet of the second cyclone C2, and the outlet of the second cyclone C2 is connected with the inlet of the third cyclone C3 to By analogy; the outlet of the first raw meal feeding device 2 is connected to the air inlet of the first cyclone C1, and the outlet of the second raw meal feeding device 3 is connected to the air inlet of the second cyclone C2.
流通组件包括旁路烟道4、第一旁路风门5、主路烟道6、第一主路风门7、余热锅炉12、第一高温风机13和收尘装置14；主路烟道6的一端与第一旋风筒C1的出风口相连，主路烟道6的另一端与一级预除尘装置8的进风口相连，第一主路风门7设置在主路烟道6上；旁路烟道4的一端与第二旋风筒C2的出风口相连，第一旁路风门5设置在旁路烟道4上；余热锅炉12和高温风机13均设置在主路烟道6上并设于第一主路风门7的下游侧；高温风机13设于余热锅炉12的下游侧；流通组件还包括第二主路风门7-1，第二主路风门7-1设置在主路烟道6上并设于余热锅炉12和高温风机13之间，旁路烟道4的另一端接入到主路烟道6上并设于第二主路风门7-1和高温风机13之间，收尘装置14连接在SCR反应器11的出风口上。The circulation components include the bypass flue 4, the first bypass damper 5, the main flue 6, the first main flue 7, the waste heat boiler 12, the first high temperature fan 13 and the dust collection device 14; the main flue 6 One end is connected to the air outlet of the first cyclone C1, the other end of the main road flue 6 is connected to the air inlet of the primary pre-dust removal device 8, and the first main road damper 7 is arranged on the main road flue 6; the bypass smoke One end of the duct 4 is connected with the air outlet of the second cyclone C2, the first bypass damper 5 is arranged on the bypass flue 4; the waste heat boiler 12 and the high temperature fan 13 are both arranged on the main flue 6 and arranged on the second A downstream side of the main road damper 7; the high temperature fan 13 is arranged on the downstream side of the waste heat boiler 12; the circulation assembly also includes a second main road damper 7-1, which is arranged on the main road flue 6 It is arranged between the waste heat boiler 12 and the high temperature fan 13, and the other end of the bypass flue 4 is connected to the main road flue 6 and is arranged between the second main road air door 7-1 and the high temperature fan 13 to collect dust The device 14 is connected to the air outlet of the SCR reactor 11.
本实施例适用于当SCR反应器11处于中温工况时，正常操作时，烟气到SCR反应器11内的温度约为200℃；烟气从第一旋风筒C1的出风口出来后经由主路烟道6的一端流经余热锅炉12，然后再依次流经一级预除尘装置8、二级精除尘装置9、SCR反应器11和收尘装置14。This embodiment is suitable for when the SCR reactor 11 is in a medium-temperature working condition, and during normal operation, the temperature of the flue gas into the SCR reactor 11 is about 200°C; the flue gas comes out of the air outlet of the first cyclone C1 and passes through the main One end of the road flue 6 flows through the waste heat boiler 12, and then flows through the primary pre-dust removal device 8, the secondary fine dust removal device 9, the SCR reactor 11 and the dust collection device 14 in sequence.
当硫酸氢铵堵塞催化剂时，可采取以下三种方法：When ammonium bisulfate blocks the catalyst, the following three methods can be adopted:
第一种方法：开启第二生料喂料装置3，关闭第一生料喂料装置2，其余操作与正常运行时保持一样，预热组件的出口烟气温度在220℃左右，烟气到SCR反应器11的温度约为200℃，温度的升高可以自动解析催化剂上粘附的硫酸氢铵。The first method: turn on the second raw meal feeding device 3, turn off the first raw meal feeding device 2, and the rest of the operation is the same as in normal operation. The outlet flue gas temperature of the preheating assembly is about 220 ℃, and the flue gas reaches The temperature of the SCR reactor 11 is about 200°C, and the increase in temperature can automatically resolve the ammonium bisulfate adhering to the catalyst.
第二种方法：保持正常运行时，开启第一生料喂料装置2并关停第二生料喂料装置3，将第一主路风门7、第二主路风门7-1和旁路风门5均开启但均调节到较小的通量，从而将预热组件的出口烟气温度平稳调整至约200℃左右。The second method: while maintaining normal operation, turn on the first raw meal feeding device 2 and shut down the second raw meal feeding device 3, and connect the first main road damper 7, the second main road damper 7-1 and the bypass The dampers 5 are all opened but adjusted to a small flux, so that the outlet flue gas temperature of the preheating assembly is smoothly adjusted to about 200°C.
第三种方法：同时开启第一生料喂料装置2和第二生料喂料装置 3，将第一主路风门7、第二主路风门7-1和旁路风门5均开启但均调节到较小的通量，从而将预热组件出口温度平稳调整至约200℃左右。The third method: Turn on the first raw meal feeding device 2 and the second raw meal feeding device 3 at the same time, and open the first main road damper 7, the second main road damper 7-1 and the bypass damper 5, but both Adjust to a smaller flux, so as to smoothly adjust the outlet temperature of the preheating assembly to about 200°C.
实施例3：Example 3:
如图3所示，一种自解析SCR脱硝***，包括预热组件、第一生料喂料装置2、第二生料喂料装置3、流通组件、一级预除尘装置8、二级精除尘装置9、喷射装置10、SCR反应器11和窑灰收集装置15；一级预除尘装置8的出风口与二级精除尘装置9的进风口相连；SCR反应器11的进风口与二级精除尘装置9的出风口相连；一级预除尘装置8、二级精除尘装置9和SCR反应器11的出料口均与窑灰收集装置15相连，喷射装置10设置在二级精除尘装置9和SCR反应器11之间，喷射装置10的出料口与二级精除尘装置9的出风口相连，预热组件通过流通组件与一级预除尘装置8相连，第一生料喂料装置2和第二生料喂料装置3的出料口均与预热组件相连。As shown in Figure 3, a self-analysis SCR denitration system includes a preheating component, a first raw material feeding device 2, a second raw material feeding device 3, a circulation component, a primary pre-dust removal device 8, and a secondary fine Dust removal device 9, spray device 10, SCR reactor 11 and kiln dust collection device 15; the air outlet of the primary pre-dust removal device 8 is connected to the air inlet of the secondary fine dust removal device 9; the air inlet of the SCR reactor 11 is connected to the secondary The outlet of the fine dust removal device 9 is connected; the first level pre-dust removal device 8, the second level fine dust removal device 9 and the discharge port of the SCR reactor 11 are all connected to the kiln dust collection device 15, and the spray device 10 is set in the second level fine dust removal device Between 9 and SCR reactor 11, the discharge port of the spray device 10 is connected to the air outlet of the secondary fine dust removal device 9, the preheating component is connected to the primary pre-dust removal device 8 through the circulation component, the first raw meal feeding device 2 and the discharge port of the second raw meal feeding device 3 are both connected with the preheating assembly.
预热组件包括多个相互串联的旋风筒，为现有技术，连接原理如下：第二旋风筒C2的出风口与第一旋风筒C1的进风口相连，第一旋风筒C1的出料口与第二旋风筒C2的进风口相连，第三旋风筒C3的出风口与第二旋风筒C2的进风口相连，第二旋风筒C2的出料口与第三旋风筒C3的进风口相连，以此类推；第一生料喂料装置2的出料口与第一旋风筒C1的进风口相连，第二生料喂料装置3的出料口与第二旋风筒C2的进风口相连。The preheating assembly includes a plurality of cyclones connected in series. It is the prior art. The connection principle is as follows: the air outlet of the second cyclone C2 is connected with the air inlet of the first cyclone C1, and the discharge port of the first cyclone C1 is connected with the air inlet of the first cyclone C1. The inlet of the second cyclone C2 is connected, the outlet of the third cyclone C3 is connected with the inlet of the second cyclone C2, and the outlet of the second cyclone C2 is connected with the inlet of the third cyclone C3 to By analogy; the outlet of the first raw meal feeding device 2 is connected to the air inlet of the first cyclone C1, and the outlet of the second raw meal feeding device 3 is connected to the air inlet of the second cyclone C2.
流通组件包括旁路烟道4、第一旁路风门5、主路烟道6、第一主路风门7、余热锅炉12、第一高温风机13和收尘装置14；主路烟道6的一端与第一旋风筒C1的出风口相连，主路烟道6的另一端与SCR反应器11的进风口相连并设于喷射装置10的上游侧，第一主路风门7设置在主路烟道6上，余热锅炉12、高温风机13和收尘装置14沿烟气流动方向依次设在主路烟道6上并均设于第一主路风门7 的下游侧，旁路烟道4的一端与第二旋风筒C2的出风口相连，旁路烟道4的另一端与一级预除尘装置8的进风口相连，第一旁路风门5设置在旁路烟道4上；流通组件还包括第二旁路风门5-1、第三主路风门7-2和第二高温风机13-1；第三主路风门7-2设置在主路烟道6上并设于收尘装置14的下游侧，第二高温风机13-1和第二旁路风门5-1沿烟气流动方向依次设置在主路烟道6的另一端与二级精除尘装置9的出风口之间。The circulation components include the bypass flue 4, the first bypass damper 5, the main flue 6, the first main flue 7, the waste heat boiler 12, the first high temperature fan 13 and the dust collection device 14; the main flue 6 One end is connected to the air outlet of the first cyclone C1, the other end of the main flue 6 is connected to the air inlet of the SCR reactor 11 and is arranged on the upstream side of the spray device 10, and the first main air damper 7 is arranged on the main flue On the duct 6, the waste heat boiler 12, the high temperature fan 13 and the dust collecting device 14 are arranged in the main flue 6 in sequence along the flue gas flow direction, and they are all arranged on the downstream side of the first main duct damper 7, and the bypass flue 4 One end is connected to the air outlet of the second cyclone C2, the other end of the bypass flue 4 is connected to the air inlet of the primary pre-dust removal device 8, and the first bypass damper 5 is arranged on the bypass flue 4; Including the second bypass damper 5-1, the third main road damper 7-2 and the second high temperature fan 13-1; the third main road damper 7-2 is arranged on the main road flue 6 and is arranged on the dust collector 14 The second high temperature fan 13-1 and the second bypass damper 5-1 are arranged in sequence along the flue gas flow direction between the other end of the main flue 6 and the air outlet of the secondary fine dust removal device 9 on the downstream side.
本实施例适用于当SCR反应器11处于低温SCR工况下，正常操作时，烟气到SCR反应器11的温度约为100～160℃，打开第一主路风门7、第三主路风门7-2和第二旁路风门5-1，当烟气从第一旋风筒C1的出风口出来后进入主路烟道6中，并在高温风机13的带动下依次流经余热锅炉12和收尘装置14后进入SCR反应器11；从第二旋风筒C2的出风口出来的烟气在第二高温风机13的带动下经由旁路烟道4依次流经一级预除尘装置8和二级精除尘装置9后也进入SCR反应器11。This embodiment is suitable for when the SCR reactor 11 is in a low temperature SCR condition, and the temperature of the flue gas to the SCR reactor 11 is about 100-160°C during normal operation, the first main road damper 7 and the third main road damper are opened. 7-2 and the second bypass damper 5-1, when the flue gas exits the air outlet of the first cyclone C1, it enters the main flue duct 6, and is driven by the high-temperature fan 13 to flow through the waste heat boiler 12 and After the dust collection device 14 enters the SCR reactor 11; the flue gas from the air outlet of the second cyclone C2 is driven by the second high-temperature fan 13 and flows through the primary pre-dust removal device 8 and the second pre-dust removal device 8 through the bypass flue 4 in turn. After the fine dust removal device 9 also enters the SCR reactor 11.
当硫酸氢铵堵塞催化剂时，可采取以下三种方法：When ammonium bisulfate blocks the catalyst, the following three methods can be adopted:
第一种方法：开启第二生料喂料装置3，关闭第一生料喂料装置2，其余操作与正常运行时保持一样，预热组件的出口烟气温度在320℃左右，烟气到SCR反应器11的温度约为310℃，温度的升高可以自动解析催化剂上粘附的硫酸氢铵。The first method: Turn on the second raw meal feeding device 3, close the first raw meal feeding device 2, and the rest of the operation is the same as in normal operation. The outlet flue gas temperature of the preheating component is about 320℃, and the flue gas reaches about 320℃. The temperature of the SCR reactor 11 is about 310°C, and the increase in temperature can automatically resolve the ammonium bisulfate adhering to the catalyst.
第二种方法：保持正常运行时，开启第一生料喂料装置2并关停第二生料喂料装置3，将第一主路风门7、第三主路风门7-2、第二旁路风门5-1和第一旁路风门5均开启但均调节到较小的通量，从而将预热组件的出口烟气温度平稳调整至100～160℃左右。The second method: While maintaining normal operation, turn on the first raw meal feeding device 2 and shut down the second raw meal feeding device 3, and set the first main road damper 7, the third main road damper 7-2, and the second main road damper 7-2. The bypass damper 5-1 and the first bypass damper 5 are both opened but adjusted to a smaller flux, so that the outlet flue gas temperature of the preheating assembly is smoothly adjusted to about 100-160°C.
第三种方法：同时开启第一生料喂料装置2和第二生料喂料装置3，将将第一主路风门7、第三主路风门7-2、第二旁路风门5-1和第一旁路风门5均开启但均调节到较小的通量，从而将预热组件出口温 度平稳调整至100～160℃左右。The third method: turn on the first raw meal feeding device 2 and the second raw meal feeding device 3 at the same time, and the first main road damper 7, the third main road damper 7-2, and the second bypass damper 5 1 and the first bypass damper 5 are both opened but adjusted to a smaller flux, so that the outlet temperature of the preheating assembly is smoothly adjusted to about 100-160°C.
SCR反应器11始终布置在相互串联的一级预除尘装置8和二级精除尘装置9之后，以使进入SCR反应器11内的烟气中粉尘含量降低，解决了高尘方案中的粉尘浓度高的问题；在二级精除尘装置9前设置一级预除尘装置8可以缓解二级精除尘装置9跳停引起的反应器进口粉尘浓度高的问题，从而缓解催化剂的粉尘堵塞风险；同时保证在线烟气进SCR反应器11解析硫酸氢铵的效率。The SCR reactor 11 is always arranged after the first-stage pre-dust removal device 8 and the second-stage fine dust removal device 9 connected in series to reduce the dust content in the flue gas entering the SCR reactor 11 and solve the dust concentration in the high dust solution High problem; the installation of a first-level pre-dust removal device 8 in front of the second-level fine dust removal device 9 can alleviate the problem of high dust concentration at the reactor inlet caused by the tripping of the second-level fine dust removal device 9, thereby alleviating the risk of dust clogging of the catalyst; On-line flue gas enters the SCR reactor 11 to resolve the efficiency of ammonium bisulfate.
本发明通过喂料方式和出风方式的转换，有效提高了预热组件的出口烟气风温，利于在硫酸氢铵堵塞催化剂时自动解析硫酸氢铵以提高脱硝效率，成本低；另外，通过设置一级预除尘装置和或二级精除尘装置，有效降低烟气含尘量，降低粉尘堵塞催化剂的可能性；同时提高了在线烟气解析硫酸氢铵的效率，从而有效保证烟气稳定地达到环保排放指标，具有显著的经济效益和社会效益。The present invention effectively increases the outlet flue gas temperature of the preheating assembly through the conversion of the feeding mode and the air outlet mode, which is beneficial to automatically analyze the ammonium bisulfate when the ammonium bisulfate blocks the catalyst to improve the denitrification efficiency, and the cost is low; The first-level pre-dust removal device and the second-level fine dust removal device are installed to effectively reduce the dust content of the flue gas and reduce the possibility of dust clogging the catalyst; at the same time, the efficiency of online flue gas analysis of ammonium bisulfate is improved, so as to effectively ensure that the flue gas is stable Reaching environmental protection emission targets has significant economic and social benefits.
最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的技术人员应当理解，其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行同等替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神与范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still The technical solutions recorded in the foregoing embodiments are modified, or some of the technical features are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (6)

  1. 一种自解析SCR脱硝***，包括预热组件、第一生料喂料装置、第二生料喂料装置、流通组件、一级预除尘装置、二级精除尘装置、喷射装置、SCR反应器和窑灰收集装置，第一生料喂料装置和第二生料喂料装置的出料口均与预热组件相连，其特征在于，所述一级预除尘装置的出风口与二级精除尘装置的进风口相连；所述SCR反应器的进风口与二级精除尘装置的出风口相连；所述一级预除尘装置、二级精除尘装置和SCR反应器的出料口均与窑灰收集装置相连，所述喷射装置设置在二级精除尘装置和SCR反应器之间，所述喷射装置的出料口与二级精除尘装置的出风口相连，所述预热组件通过流通组件与一级预除尘装置相连。A self-analysis SCR denitration system, including a preheating component, a first raw meal feeding device, a second raw meal feeding device, a circulation component, a first-level pre-dust removal device, a second-level fine dust removal device, an injection device, and an SCR reactor And the kiln dust collection device, the discharge ports of the first raw meal feeding device and the second raw meal feeding device are all connected with the preheating assembly, and it is characterized in that the air outlet of the first-stage pre-dust removal device and the second-stage fine The air inlet of the dust removal device is connected; the air inlet of the SCR reactor is connected to the air outlet of the secondary fine dust removal device; the primary pre-dust removal device, the secondary fine dust removal device and the discharge port of the SCR reactor are all connected to the kiln The ash collection device is connected, the spray device is arranged between the secondary fine dust removal device and the SCR reactor, the discharge port of the spray device is connected with the air outlet of the secondary fine dust removal device, and the preheating assembly passes through the circulation assembly It is connected with the primary pre-dust removal device.
  2. 根据权利要求1所述的一种自解析SCR脱硝***，其特征在于，所述流通组件包括旁路烟道、第一旁路风门、主路烟道、第一主路风门、余热锅炉、第一高温风机和收尘装置；所述主路烟道的一端与第一旋风筒的出风口相连，所述主路烟道的另一端与一级预除尘装置的进风口相连，所述第一主路风门设置在主路烟道上；所述旁路烟道的一端与第二旋风筒的出风口相连，所述旁路烟道的另一端也与一级预除尘装置的进风口相连，所述第一旁路风门设置在旁路烟道上；所述余热锅炉的进风口与SCR反应器的出风口相连，所述余热锅炉的出风口通过第一高温风机与收尘装置相连。The self-analysis SCR denitration system according to claim 1, wherein the circulation component includes a bypass flue, a first bypass damper, a main flue, a first main damper, a waste heat boiler, and a second A high-temperature fan and a dust collecting device; one end of the main flue is connected to the air outlet of the first cyclone, the other end of the main flue is connected to the air inlet of the first-stage pre-dust removal device, and the first The main road damper is arranged on the main road flue; one end of the bypass flue is connected to the air outlet of the second cyclone, and the other end of the bypass flue is also connected to the air inlet of the primary dust removal device, so The first bypass damper is arranged on the bypass flue; the air inlet of the waste heat boiler is connected with the air outlet of the SCR reactor, and the air outlet of the waste heat boiler is connected with the dust collector through a first high temperature fan.
  3. 根据权利要求1所述的一种自解析SCR脱硝***，其特征在于，所述流通组件包括旁路烟道、第一旁路风门、主路烟道、第一主路风门、余热锅炉、第一高温风机和收尘装置；所述主路烟道的一端与第一旋风筒的出风口相连，所述主路烟道的另一端与一级预除尘装置的进风口相连，所述第一主路风门设置在主路烟道上；所述旁路烟道的一端与第二旋风筒的出风口相连，所述第一旁路风门设置在旁路烟道上；所述余热锅炉和高温风机均设置在主路烟道上并设于第一主 路风门的下游侧；所述高温风机设于余热锅炉的下游侧，所述收尘装置连接在SCR反应器的出风口上。The self-analysis SCR denitration system according to claim 1, wherein the circulation component includes a bypass flue, a first bypass damper, a main flue, a first main damper, a waste heat boiler, and a second A high-temperature fan and a dust collecting device; one end of the main flue is connected to the air outlet of the first cyclone, the other end of the main flue is connected to the air inlet of the first-stage pre-dust removal device, and the first The main road damper is arranged on the main road flue; one end of the bypass flue is connected with the air outlet of the second cyclone, the first bypass damper is arranged on the bypass flue; the waste heat boiler and the high temperature fan are both It is arranged on the flue duct of the main road and on the downstream side of the first main road damper; the high temperature fan is arranged on the downstream side of the waste heat boiler, and the dust collecting device is connected to the air outlet of the SCR reactor.
  4. 根据权利要求3所述的一种自解析SCR脱硝***，其特征在于，所述流通组件还包括第二主路风门，所述第二主路风门设置在主路烟道上并设于余热锅炉和高温风机之间，所述旁路烟道的另一端接入到主路烟道上并设于第二主路风门和高温风机之间。The self-analysis SCR denitration system according to claim 3, wherein the circulation assembly further comprises a second main road damper, and the second main road damper is arranged on the main road flue and in the waste heat boiler and Between the high temperature fans, the other end of the bypass flue is connected to the main road flue and is arranged between the second main road damper and the high temperature fan.
  5. 根据权利要求1所述的一种自解析SCR脱硝***，其特征在于，所述流通组件包括旁路烟道、第一旁路风门、主路烟道、第一主路风门、余热锅炉、第一高温风机和收尘装置；所述主路烟道的一端与第一旋风筒的出风口相连，所述主路烟道的另一端与SCR反应器的进风口相连并设于喷射装置的上游侧，所述第一主路风门设置在主路烟道上，所述余热锅炉、高温风机和收尘装置沿烟气流动方向依次设在主路烟道上并均设于第一主路风门的下游侧，所述旁路烟道的一端与第二旋风筒的出风口相连，所述旁路烟道的另一端与一级预除尘装置的进风口相连，所述第一旁路风门设置在旁路烟道上。The self-analysis SCR denitration system according to claim 1, wherein the circulation component includes a bypass flue, a first bypass damper, a main flue, a first main damper, a waste heat boiler, and a second A high-temperature fan and a dust collection device; one end of the main flue is connected to the air outlet of the first cyclone, and the other end of the main flue is connected to the air inlet of the SCR reactor and is located upstream of the spraying device On the side, the first main road damper is arranged on the main road flue, and the waste heat boiler, high temperature fan and dust collection device are sequentially arranged on the main road flue along the flue gas flow direction and are all located downstream of the first main road damper Side, one end of the bypass flue is connected with the air outlet of the second cyclone, the other end of the bypass flue is connected with the air inlet of the first-stage pre-dust removal device, and the first bypass damper is arranged beside Road flue.
  6. 根据权利要求5所述的一种自解析SCR脱硝***，其特征在于，所述流通组件还包括第二旁路风门、第三主路风门和第二高温风机；所述第三主路风门设置在主路烟道上并设于收尘装置的下游侧，所述第二高温风机和第二旁路风门沿烟气流动方向依次设置在主路烟道的另一端与二级精除尘装置的出风口之间。The self-analysis SCR denitration system according to claim 5, wherein the circulation assembly further comprises a second bypass damper, a third main road damper, and a second high temperature fan; the third main road damper is provided The second high temperature fan and the second bypass damper are arranged on the main flue duct and on the downstream side of the dust collection device in sequence along the flue gas flow direction at the other end of the main flue duct and the outlet of the secondary fine dust removal device. Between the tuyere.
PCT/CN2020/088946 2019-12-02 2020-05-07 Self-resolving scr denitration system WO2021109448A1 (en)

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