CN211837169U - Novel SNCR (selective non-catalytic reduction) denitration system suitable for deep denitration - Google Patents

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

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Publication number
CN211837169U
CN211837169U CN202020368165.5U CN202020368165U CN211837169U CN 211837169 U CN211837169 U CN 211837169U CN 202020368165 U CN202020368165 U CN 202020368165U CN 211837169 U CN211837169 U CN 211837169U
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reducing agent
denitration
gas
distributor
hole
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CN202020368165.5U
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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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Abstract

The utility model provides a novel SNCR denitration system suitable for degree of depth denitration, including reductant dissolving system, reductant solution pumping system, reductant vaporization system, gaseous redistributor and gas injector, wherein, the reductant dissolving system is provided with the reductant entry; 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 suitable for deep denitration
Technical Field
The utility model discloses a belong to boiler smoke exhaust pollutant control environmental protection field, in particular to novel SNCR deNOx systems who is adapted to degree of depth 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 emission requirement standard.
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
An object of the utility model is to provide a novel SNCR deNOx systems who is adapted to degree of depth denitration has solved current NOXUltra-low emissions suffer from the above-mentioned disadvantages.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
the utility model provides a novel SNCR denitration system suitable for degree of depth denitration, including reductant dissolving system, reductant solution pumping system, reductant vaporization system, gaseous redistributor and gas injector, wherein, the reductant dissolving system is provided with the reductant entry; 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.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a novel SNCR denitration system suitable for deep denitration, which adopts steam as a vaporizing agent to vaporize a reducing agent firstly, the reducing agent after latent heat absorption is changed into ammonia gas, and the reaction speed of the ammonia gas and NO is faster than that of the 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 problems of large investment, large occupied area, incapability of treating the catalyst and environmental pollution existing in the SCR denitration technology for many years; 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 ℃. 870 ℃ to 110 ℃ compared with the SNCR technologyThe requirement of 0 ℃ is greatly relaxed; 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 figure 1, the utility model provides a pair of novel SNCR deNOx systems who is adapted to degree of depth denitration, throw material system 1, reductant dissolving system 2, reductant solution pumping system 3, reductant vaporization system 4, steam pressure reduction system 5, gaseous redistributor 6, gas injector 7, furnace 8, NOXThe 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; and a discharge hole of the gas ejector 7 is connected with a 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 to a controller 10, said controller 10 being further connected to a regulating valve arranged in connection between the reducing agent solution pumping system 3 and the reducing agent vaporization system 4Is connected with a pipeline.
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 utility model discloses a working process:
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 utility model uses the reducing agent vaporization system 4 to accelerate the steam to the speed of Mach 1, the steam generates high-speed airflow to suck the reducing agent and vaporize the reducing agent at high speed, the total pressure is gradually restored after the high-speed airflow is expanded and decelerated, the recovered total pressure has enough energy to spray the reducing agent (in a vapor state) after being standardized 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 detailed description is for one embodiment of the present invention, but the content is only the preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All changes and improvements made in accordance with the scope of the present invention should still fall within the scope of the present invention.

Claims (6)

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 method of claim 1The novel SNCR denitration system suitable for deep denitration is characterized in that a regulating valve is arranged on a connecting pipeline between a reducing agent solution pumping system (3) and a reducing agent vaporization system (4), the regulating valve is connected with a controller (10), and the controller (10) is connected with NOXA detection system (9); 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.
CN202020368165.5U 2020-03-20 2020-03-20 Novel SNCR (selective non-catalytic reduction) denitration system suitable for deep denitration Active CN211837169U (en)

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CN202020368165.5U CN211837169U (en) 2020-03-20 2020-03-20 Novel SNCR (selective non-catalytic reduction) denitration system suitable for deep denitration

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020368165.5U CN211837169U (en) 2020-03-20 2020-03-20 Novel SNCR (selective non-catalytic reduction) denitration system suitable for deep denitration

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Publication Number Publication Date
CN211837169U true CN211837169U (en) 2020-11-03

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