CN111249875A - Novel SNCR (selective non-catalytic reduction) denitration system and method suitable for deep denitration - Google Patents

Novel SNCR (selective non-catalytic reduction) denitration system and method suitable for deep denitration Download PDF

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Publication number
CN111249875A
CN111249875A CN202010202244.3A CN202010202244A CN111249875A CN 111249875 A CN111249875 A CN 111249875A CN 202010202244 A CN202010202244 A CN 202010202244A CN 111249875 A CN111249875 A CN 111249875A
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CN
China
Prior art keywords
reducing agent
denitration
gas
distributor
deep
Prior art date
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Pending
Application number
CN202010202244.3A
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Chinese (zh)
Inventor
刘冬
张世鑫
韩应
李煜哲
惠小龙
任伟峰
高洪培
王海涛
时正海
王孝全
王日超
任彪
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Shanxi Guojin Coal Power Co Ltd
Huaneng Clean Energy Research Institute
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Shanxi Guojin Coal Power Co Ltd
Huaneng Clean Energy Research Institute
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Application filed by Shanxi Guojin Coal Power Co Ltd, Huaneng Clean Energy Research Institute filed Critical Shanxi Guojin Coal Power Co Ltd
Priority to CN202010202244.3A priority Critical patent/CN111249875A/en
Publication of CN111249875A publication Critical patent/CN111249875A/en
Pending legal-status Critical Current

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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
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen 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
    • B01D53/346—Controlling the process
    • 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
    • B01D53/76—Gas phase processes, e.g. by using aerosols
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/10—Mixing gases with gases
    • B01F23/19—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/10—Mixing gases with gases
    • B01F23/19—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means
    • B01F23/191—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means characterised by the construction of the controlling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7179—Feed mechanisms characterised by the means for feeding the components to the mixer using sprayers, nozzles or jets
    • 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

Abstract

The invention provides a novel SNCR (selective non-catalytic reduction) denitration system and a novel SNCR denitration method suitable for deep denitration, which comprise a reducing agent dissolving system, a reducing agent solution pumping system, a reducing agent vaporization system, a gas redistributor and a gas injector, wherein the reducing agent dissolving system is provided with a reducing agent inlet; a discharge hole on the reducing agent dissolving system is connected with a feed hole of a reducing agent solution pumping system, and a discharge hole of the reducing agent solution pumping system is connected with a reducing agent feed hole of a reducing agent vaporization system; the reducing agent vaporization system is also provided with a steam inlet; the outlet of the gasified reducing agent of the reducing agent gasification system is connected with the feed inlet of the gas redistributor, the discharge outlet of the gas redistributor is connected with the feed inlet of the gas injector, and the discharge outlet of the gas injector is connected with the hearth; the technology solves the problems of large investment, large occupied area, incapability of treating the catalyst and environmental pollution existing in the SCR denitration technology for many years.

Description

Novel SNCR (selective non-catalytic reduction) denitration system and method suitable for deep denitration
Technical Field
The invention belongs to the field of environmental protection of boiler smoke discharge pollutant control, and particularly relates to a novel SNCR (selective non-catalytic reduction) denitration system and method suitable for deep denitration.
Background
At present, enterprises in China such as electric power, chemical engineering and the like strictly execute NOX≤50mg/m3(Standard, 6% O)2) However, ammonia slip increase, flue gas corrosion, air preheater blockage, and difficulty in realizing NO at medium and low loads in many power plantsXUltra low emissionsStandards are required.
At present, the more mature ultralow emission reconstruction technical routes in China comprise the following steps:
1) reforming a boiler burner and adding an SNCR denitration system;
2) an SNCR (selective non-catalytic reduction) denitration system + an SCR denitration system;
3) SNCR (Selective non catalytic reduction) denitration system and COA (chemical oxygen demand) denitration system
The above several ultra-low emission technical improvement schemes have the problems of high early-stage investment cost, high operation cost, difficult effective control of medium-low load NOx, influence on safe and stable operation of the boiler, environmental pollution and the like.
Disclosure of Invention
The invention aims to provide a novel SNCR (selective non-catalytic reduction) denitration system and method suitable for deep denitration, and solves the problem of the existing NOXUltra-low emissions suffer from the above-mentioned disadvantages.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a novel SNCR (selective non-catalytic reduction) denitration system suitable for deep denitration, which comprises a reducing agent dissolving system, a reducing agent solution pumping system, a reducing agent vaporization system, a gas redistributor and a gas injector, wherein a reducing agent inlet is formed in the reducing agent dissolving system; a discharge hole on the reducing agent dissolving system is connected with a feed hole of a reducing agent solution pumping system, and a discharge hole of the reducing agent solution pumping system is connected with a reducing agent feed hole of a reducing agent vaporization system; the reducing agent vaporization system is also provided with a low-pressure steam inlet; the reducing agent vaporization system is characterized in that a vaporized reducing agent outlet of the reducing agent vaporization system is connected with a feeding hole of the gas redistributor, a discharging hole of the gas redistributor is connected with a feeding hole of the gas ejector, and a discharging hole of the gas ejector is connected with the hearth.
Preferably, an upper distributor, a middle distributor and a lower distributor are arranged in the inner cavity of the hearth, wherein the upper distributor is arranged at the upper part of the inner cavity of the hearth; the middle distributor is arranged in the middle of the interior of the hearth; the lower distributor is arranged at the lower part of the inner cavity of the hearth; the discharge port of the gas injector is respectively connected with the upper distributor, the middle distributor and the lower distributor.
Preferably, a regulating valve is arranged on a connecting pipeline between the reducing agent solution pumping system and the reducing agent vaporization system, the regulating valve is connected with a controller, and the controller is connected with NOXA detection system; said NOXThe detection system is arranged at a smoke outlet of the hearth.
Preferably, a steam inlet of the reducing agent vaporization system is connected with a steam pressure reduction system.
Preferably, a reducing agent inlet on the reducing agent dissolving system is connected with a reducing agent feeding system.
Preferably, the vapor pressure in the reductant vaporization system is (0.5-0.8) Mpa.
A novel SNCR denitration method suitable for deep denitration is based on the novel SNCR denitration system suitable for deep denitration, and comprises the following steps:
dissolving and diluting a reducing agent by a reducing agent dissolving system to obtain a diluted reducing agent solution, conveying the reducing agent solution to a reducing agent vaporization system by a reducing agent solution pumping system, and introducing steam into the reducing agent vaporization system; the gasified reducing agent enters a gas redistributor, the reducing agent is distributed to a gas ejector arranged in the furnace and then is ejected into the hearth to be fully mixed with the smoke in the furnace, and finally the aim of denitration is fulfilled.
Preferably, the vaporized reducing agent gas is respectively sent to the upper distributor, the middle distributor and the lower distributor through the gas injector, so that the purpose of fully mixing the reducing agent gas with the flue gas in the hearth is realized.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a novel SNCR (selective non-catalytic reduction) denitration system and a novel SNCR denitration method suitable for deep denitration, wherein steam is adopted as a vaporizing agent to vaporize a reducing agent, the reducing agent after latent heat absorption is changed into ammonia gas, and the reaction speed of the ammonia gas and NO is higher than that of ammonia water and NO; the novel denitration system greatly improves the denitration rate in the furnace, reduces ammonia escape and avoids blockage of the air preheater; the technology solves the SCR denitration technology for yearsThe largest problems exist, such as large investment, large occupied area, incapability of treating the catalyst and environmental pollution; aiming at the problem of flue gas corrosion, NO and ammonia can be thoroughly decomposed into N in the combustion process2、H2O, the problem that the flue is easy to corrode after water is added in the SNCR technology is fundamentally solved; meanwhile, the novel denitration technology overcomes the problem of low reaction temperature, and the reaction temperature can be 800-1100 ℃. The requirement of 870 ℃ to 1100 ℃ is greatly relaxed compared with the SNCR technology; and the denitration rate can reach the effect of SNCR + SCR, and the investment cost is reduced.
Drawings
FIG. 1 is a schematic structural diagram of an SNCR denitration system according to the present invention;
FIG. 2 is a view of a furnace distributor arrangement according to the present invention;
wherein, 1, a reducing agent feeding system 2, a reducing agent dissolving system 3, a reducing agent solution pumping system 4, a reducing agent vaporization system 5, a steam pressure reduction system 6, a gas redistributor 7, a gas injector 8, a hearth 9 and the NOXDetection system 10, controller 11, upper dispenser 12, middle dispenser 13, lower dispenser.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the novel SNCR denitration system suitable for deep denitration provided by the invention comprises a reducing agent feeding system 1, a reducing agent dissolving system 2, a reducing agent solution pumping system 3, a reducing agent vaporization system 4, a steam pressure reduction system 5, a gas redistributor 6, a gas injector 7, a furnace 8, an NO gas redistributor 6XThe device comprises a detection system 9 and a controller 10, wherein a discharge hole of a reducing agent coating system 1 is connected with a feed hole of a reducing agent dissolving system 2; the discharge hole of the reducing agent dissolving system 2 is connected with the feed hole of the reducing agent solution pumping system 3, and the discharge hole of the reducing agent solution pumping system 3 is connected with the feed hole of the reducing agent vaporization system 4; a discharge hole of the reducing agent vaporization system 4 is connected with a feed hole of the gas redistributor 6; the discharge hole of the gas redistributor 6 is connected with the feed inlet of the gas ejector 7; the discharge hole of the gas injector 7 is connected withIs connected with the hearth 8.
NO arranged at flue gas outlet of hearth 8XAnd the detection system 9 is used for detecting the NOx emission value of the tail flue of the hearth 8.
Said NOXThe detection system 9 is connected with a controller 10, and the controller 10 is further connected with a regulating valve which is arranged on a connecting pipeline between the reducing agent solution pumping system 3 and the reducing agent vaporization system 4.
As shown in fig. 2, the discharge ports of the gas injector 7 are respectively connected with an upper distributor 11, a middle distributor 12 and a lower distributor 13, wherein the upper distributor 11 is arranged at the upper part of the inner cavity of the furnace; the middle distributor 12 is arranged in the middle of the interior of the furnace; the lower distributor 13 is arranged in the lower part of the furnace chamber.
The working process of the invention is as follows:
as shown in fig. 1, a reducing agent entering a factory enters a reducing agent dissolving system 2 to be dissolved and diluted to prepare a reducing agent solution with a reasonable concentration, the reducing agent solution is conveyed into a reducing agent vaporization system 4 through a reducing agent solution pumping system 3, steam of 0.5-0.8Mpa is introduced into the reducing agent vaporization system 4 after being subjected to pressure reduction through a steam pressure reduction system 5, the vaporized reducing agent enters a gas redistributor 6 and is distributed into gas injectors 7, and finally the vaporized reducing agent is sprayed into a hearth 8 through the gas injectors 7 arranged in the furnace to be fully mixed with flue gas in the furnace, so that the aim of denitration is finally achieved.
By NOXThe detection system 9 detects the NOx emission value of the tail flue of the hearth 8, and adjusts the reducing agent main pipe adjusting valve according to the feedback of the NOx emission value so as to control the amount of the reducing agent solution; and the automatic adjustment of the whole system is realized.
As shown in fig. 2, the vaporized reducing agent enters the gas injector 7 in the furnace 8 through the gas redistributor 6. The arrangement position of the gas injector 7 is generally determined according to the height of a hearth and the temperature of flue gas in the furnace, and the discharge holes of the gas injector 7 are arranged at the upper, middle and lower layers of the hearth.
The invention uses a reducing agent vaporization system 4 to accelerate steam to the speed of Mach 1, the steam generates high-speed airflow to suck and vaporize the reducing agent at high speed, the total pressure is gradually recovered after the high-speed airflow is expanded and decelerated, the recovered total pressure has enough energy to inject the liquefied reducing agent (in a vapor state) to a boiler combustion area, and the reaction of ammonia and NO gas is formed; greatly improves the reactivity and the reaction time of the reducing agent.
The gasified reducing agent gas is respectively sent to an upper distributor 11, a middle distributor 12 and a lower distributor 13 through a gas injector 7, and the reducing agent gas is fully mixed with the flue gas in the hearth, so that the aim of denitration is finally fulfilled.
The above description is intended to illustrate an embodiment of the present invention, but the present invention is only a preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. All changes and modifications that come within the scope of the invention are desired to be protected.

Claims (8)

1. The novel SNCR denitration system suitable for deep denitration is characterized by comprising a reducing agent dissolving system (2), a reducing agent solution pumping system (3), a reducing agent vaporization system (4), a gas redistributor (6) and a gas injector (7), wherein a reducing agent inlet is formed in the reducing agent dissolving system (2); a discharge hole on the reducing agent dissolving system (2) is connected with a feed hole of the reducing agent solution pumping system (3), and a discharge hole of the reducing agent solution pumping system (3) is connected with a reducing agent feed hole of the reducing agent vaporization system (4); the reducing agent vaporization system (4) is also provided with a low-pressure steam inlet; the device is characterized in that a vaporized reducing agent outlet of the reducing agent vaporization system (4) is connected with a feeding hole of the gas redistributor (6), a discharging hole of the gas redistributor (6) is connected with a feeding hole of the gas ejector (7), and a discharging hole of the gas ejector (7) is connected with the hearth (8).
2. The novel SNCR denitration system adapted to deep denitration of claim 1, wherein an upper distributor (11), a middle distributor (12) and a lower distributor (13) are arranged in the inner cavity of the furnace (8), wherein the upper distributor (11) is arranged at the upper part of the inner cavity of the furnace; the middle distributor (12) is arranged in the middle of the interior of the hearth; the lower distributor (13) is arranged at the lower part of the inner cavity of the hearth; the discharge hole of the gas ejector (7) is respectively connected with the upper distributor (11), the middle distributor (12) and the lower distributor (13).
3. The novel SNCR (selective non-catalytic reduction) denitration system suitable for deep denitration according to claim 1, wherein a regulating valve is arranged on a connecting pipeline between the reducing agent solution pumping system (3) and the reducing agent vaporization system (4), the regulating valve is connected with a controller (10), and the controller (10) is connected with NOXA detection system (10); said NOXThe detection system (9) is arranged at the flue gas outlet of the furnace (8).
4. The novel SNCR denitration system adapted for deep denitration of claim 1, wherein a steam inlet of the reducing agent vaporization system (4) is connected with a steam pressure reduction system (5).
5. The novel SNCR denitration system adapted for deep denitration of claim 1, wherein a reducing agent inlet on the reducing agent dissolving system (2) is connected with a reducing agent feeding system (1).
6. The novel SNCR denitration system adapted for deep denitration of claim 1, wherein the vapor pressure in the reducing agent vaporization system (4) is (0.5-0.8) MPa.
7. A novel SNCR denitration method suitable for deep denitration, which is characterized in that the novel SNCR denitration system suitable for deep denitration is based on any one of claims 1 to 6, and comprises the following steps:
the reducing agent is dissolved and diluted by a reducing agent dissolving system (2) to obtain a diluted reducing agent solution, the reducing agent solution is conveyed into a reducing agent vaporization system (4) by a reducing agent solution pumping system (3), and low-pressure steam is connected into the reducing agent vaporization system (4); the vaporized reducing agent enters a gas redistributor (6), the reducing agent is distributed to a gas injector (7) arranged in the furnace, and then the reducing agent is sprayed into a hearth (8) to be fully mixed with the smoke in the furnace, and finally the aim of denitration is achieved.
8. The novel SNCR denitration method suitable for deep denitration according to claim 7, characterized in that the gasified reductant gas is respectively sent to the upper distributor (11), the middle distributor (12) and the lower distributor (13) through the gas injector (7), so as to achieve the purpose of fully mixing the reductant gas with the flue gas in the furnace.
CN202010202244.3A 2020-03-20 2020-03-20 Novel SNCR (selective non-catalytic reduction) denitration system and method suitable for deep denitration Pending CN111249875A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113041837A (en) * 2021-03-08 2021-06-29 聊城氟尔新材料科技有限公司 Process for denitration of flue gas generated after incineration of fluorine-containing waste liquid of fluorine material

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105944546A (en) * 2016-07-08 2016-09-21 安徽电气工程职业技术学院 In-furnace denitration system and in-furnace denitration technology of circulating fluidized bed (CFB) boiler

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105944546A (en) * 2016-07-08 2016-09-21 安徽电气工程职业技术学院 In-furnace denitration system and in-furnace denitration technology of circulating fluidized bed (CFB) boiler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113041837A (en) * 2021-03-08 2021-06-29 聊城氟尔新材料科技有限公司 Process for denitration of flue gas generated after incineration of fluorine-containing waste liquid of fluorine material

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