Temperature regulating system and method for increasing inlet flue gas temperature of SCR denitrification device

A temperature regulation system and inlet technology, applied in the field of temperature regulation system, can solve the problems of denitration, side reactions, failure, etc., and achieve the effects of easy transformation and operation, reduction of emissions, and high cost performance.

Active Publication Date: 2017-03-29
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

Selective Catalytic Reduction (SCR) technology is currently the main direction of denitrification transformation in power plants. Although the technology is relatively mature, there are still some problems to be solved. For example, the SCR reactor catalyst has high requirements on the reaction temperature, and the optimal reaction temperature is 308-420 ℃, when the flue temperature is too low, side reactions will occur on the catalyst, and the injected ammonia gas will cause catalyst poisoning and even failure, which will eventually lead to a serious reduction in denitrification efficiency or no denitrification effect at all, and then affect the stable operation of the boiler

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  • Temperature regulating system and method for increasing inlet flue gas temperature of SCR denitrification device

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Embodiment 1

[0028] figure 1 It is a structural schematic diagram of a temperature regulation system disclosed in this embodiment, such as figure 1 As shown, the temperature adjustment system includes: reheat steam pipe (1), steam inlet pipe (2), heat exchanger (3), return steam pipe (4), reheat accident water spray pipe (5), reheat Thermal accident spray desuperheater (51) and water inlet pipe (6). Wherein, the inlet of the steam inlet pipe (2) communicates with the reheat steam pipe (1); the outlet of the steam inlet pipe (2) communicates with one side of the heat exchanger (3); the The inlet of the steam return pipe (4) is arranged on the side of the heat exchanger (3) away from the steam inlet pipe (2), and the steam return pipe (4) communicates with the heat exchanger (3); The reheat accident water spray pipe (5) is socketed with the reheat accident water spray desuperheater (51), and the reheat accident water spray pipe (5) communicates with the reheat steam pipe (1) and the The o...

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Abstract

The invention belongs to the technical field of coal-fired boiler environment protection and particularly relates to a temperature regulating system and a method for increasing the inlet flue gas temperature of an SCR denitrification device. The temperature regulating system is simple in structure, easy to transform, easy to operate during operation and high in reliability. The method includes: when a boiler operates at low load, a heat exchanger outlet electric valve is completely opened, and the openness of a heat exchanger inlet valve is slowly regulated according to the previous flue gas temperature measuring point reading of the SCR denitrification device. The temperature regulating system is applied to the technical field of coal-fired boiler environment protection, SCR inlet flue gas temperature can be effectively increased, the discharge amount of nitrogen oxide of boiler flue gas can be lowered, and environment protection is achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection of coal-fired boilers, and in particular relates to a temperature adjustment system and a method for increasing the inlet smoke temperature of an SCR denitrification device. Background technique [0002] With the improvement of the country's pollutant emission standards for power plants, it has become one of the important tasks of power plants to meet the emission standards of nitrogen oxides in boiler flue gas. Selective Catalytic Reduction (SCR) technology is currently the main direction of denitrification transformation in power plants. Although the technology is relatively mature, there are still some problems to be solved. For example, the SCR reactor catalyst has high requirements on the reaction temperature, and the optimal reaction temperature is 308-420 ℃, when the flue temperature is too low, side reactions will occur on the catalyst, and the injected ammonia gas will ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/8625
Inventor 廖永进钟俊曾庭华李方勇冯永新王诗啸高正阳
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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