SNCR and low-temperature SCR coupled flue gas denitration system and use method thereof

An SCR reactor, low temperature technology, applied in the field of SNCR and low temperature SCR coupled flue gas denitrification system, can solve the problems of insufficient layout space, complex system, large workload and investment cost, and achieve the guarantee of flue gas temperature level and system economy. Good, ensure the effect of denitration efficiency

Pending Publication Date: 2020-09-15
HUANENG CLEAN ENERGY RES INST +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The SNCR process system is simple and the investment cost is low, but subject to the reaction conditions, the denitrification efficiency is low; the SCR denitrification process has high denitrification efficiency but the system is complicated and the investment cost is high, and when it is applied to the old boiler renovation, it is ofte

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  • SNCR and low-temperature SCR coupled flue gas denitration system and use method thereof
  • SNCR and low-temperature SCR coupled flue gas denitration system and use method thereof
  • SNCR and low-temperature SCR coupled flue gas denitration system and use method thereof

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Embodiment Construction

[0024] A SNCR-coupled low-temperature SCR flue gas denitrification system proposed by the present invention and its application method will be described in detail below in conjunction with the accompanying drawings.

[0025] The present invention provides an SNCR coupled low-temperature SCR flue gas denitrification system, wherein the main spray gun 152 is connected to the outlet of the ammonia water tank 16 through the ammonia water pump 143, and a first ammonia water valve 123 and a first ammonia water valve 123 are arranged between the ammonia water tank 16 and the ammonia water pump 143. Ammonia check valve 132; main spray gun 152 air inlet is connected with air compressor 144 air outlets, and compressed air channel is provided with compressed air valve 124; The cold air distribution valve 18 is provided with a cooling air outlet, and the cooling air outlet is used to send the cold air produced by the primary fan to cool the main spray gun 152;

[0026] Further, the main s...

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Abstract

The invention discloses an SNCR and low-temperature SCR coupled flue gas denitration system and a use method thereof. The system comprises a tail flue, a flue gas heater, a low-temperature SCR reactor, a main spray gun and an ammonia water tank, wherein the main spray gun is connected with an outlet of the ammonia water tank through a ammonia water pump, the main spray gun is arranged in a front flue of the tail flue, the main spray gun is used for spraying ammonia water into the front flue and performing an SNCR reaction, a flue gas outlet of the tail flue is connected with a flue gas inlet of the flue gas heater, a flue gas outlet of the flue gas heater is connected with a flue gas inlet of the low-temperature SCR reactor, and the low-temperature SCR reactor is used for carrying out low-temperature SCR reaction by taking escape ammonia in the SNCR reaction as a denitration reducing agent. The SNCR and low-temperature SCR processes are coupled for denitration at a relatively low fluegas temperature, so that NOx emission under all working conditions reaches the standard; and the denitration cost can be saved, certain flexibility and reliability are achieved, and the system is simple in device, small in boiler body transformation amount and easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of air pollution control and environmental protection, and in particular relates to a flue gas denitrification system coupled with SNCR and low-temperature SCR and a use method thereof. Background technique [0002] With the improvement of our country's economy and living standards, people will pay more and more attention to the environment. The environmental pollution caused by coal-based industrial production is a restrictive factor for my country's industrial development. The tail gas produced by coal combustion contains soot, sulfur dioxide (SO 2 ), nitrogen oxides (NO x ) and carbon dioxide (CO 2 ) and other pollutants and greenhouse gases have caused serious environmental problems, which are important issues to be solved urgently for the sustainable development of my country's economy. At present, coal-fired boilers in power stations, boilers burning domestic waste, and industrial boilers / kilns are ...

Claims

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Application Information

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IPC IPC(8): B01D53/90B01D53/79B01D53/56
CPCB01D53/56B01D53/79B01D53/8625B01D53/90B01D2251/2062B01D2258/0283
Inventor 赵鹏勃茹宇高洪培王海涛肖平翁君杰邬聚琪张旭东
Owner HUANENG CLEAN ENERGY RES INST
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