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Device for removing NOX from smoke by combining ammonia agent spraying and built-in catalytic reaction

A catalytic reaction, built-in technology, applied in the direction of chemical instruments and methods, dispersed particle separation, separation methods, etc., can solve the problems of high operating costs, complex systems, large investment, etc., to avoid direct erosion, high NOX reduction rate, The effect of improving denitrification efficiency

Active Publication Date: 2013-08-21
江苏富春江环保热电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the SCR flue gas denitrification technology system is complicated, the investment is large, and the operating cost is high. For many small and medium-sized boilers, SCR denitrification is obviously not an economically feasible choice.

Method used

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  • Device for removing NOX from smoke by combining ammonia agent spraying and built-in catalytic reaction
  • Device for removing NOX from smoke by combining ammonia agent spraying and built-in catalytic reaction
  • Device for removing NOX from smoke by combining ammonia agent spraying and built-in catalytic reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A circulating fluidized bed boiler NO X The initial emission concentration is 580mg / Nm 3 , sprayed with 20% ammonia water in the first three layers of three air ducts, flame angles, and cyclones. The NSR is 1.4, and its NO X The removal rate is 65%. The ammonia agent is not supplemented, and enters the 2-layer SCR catalyst for reaction. The catalyst adopts a module with a volume of 450*450*500mm and a corrugated type. The final denitrification efficiency reaches 87.5%, and no ammonia escape is detected at the tail.

Embodiment 2

[0063] A circulating fluidized bed boiler NO X The initial emission concentration is 580mg / Nm 3 , sprayed with 20% ammonia water in the first two layers of the flame angle and the cyclone, the NSR was 1.4, and its NO X The removal rate was 51.5%. The ammonia agent is not supplemented, and enters the 2-layer SCR catalyst for reaction. The catalyst adopts a module with a volume of 450*450*500mm and a corrugated type. The final denitrification efficiency reaches 84.5%, and no ammonia escape is detected at the tail.

Embodiment 3

[0065] A circulating fluidized bed boiler NOX The initial emission concentration is 580mg / Nm3, sprayed with 20% ammonia water in the first three layers of the three air ducts, the flame angle, and the cyclone, the NSR is 1.2, and its NO X The removal rate was 46.3%. The ammonia agent is not supplemented, and enters the 2-layer SCR catalyst for reaction. The catalyst adopts a module with a volume of 450*450*500mm and a corrugated type. The final denitrification efficiency reaches 72%, and no ammonia escape is detected at the tail.

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Abstract

The invention discloses a device for removing NOX from smoke by combining ammonia agent spraying and built-in catalytic reaction. The device comprises a combustion chamber, a cyclone barrel, a boiler steering chamber, a high-temperature economizer, a low-temperature economizer and an air preheater which are sequentially connected with one another, wherein the middle part of the combustion chamber is communicated with a tertiary air pipe; and a furnace arch is arranged on the upper part in the combustion chamber. The device also comprises a first layer spraying gun arranged in the tertiary air pipe, a second layer spraying gun which is arranged on the wall of the combustion chamber and is positioned at the furnace arch, a third layer spraying gun arranged at an inlet of the cyclone barrel, and catalyst beds which are built in spaces between the high-temperature economizer and the low-temperature economizer and between the low-temperature economizer and the air preheater and is used for carrying silicon controlled rectifier (SCR) denitration catalysts. According to the device, by improving the arrangement way of a reducing agent spraying gun, the smoke denitration efficiency is improved and the denitration cost is reduced; the device is particularly suitable for denitration improvement of circulation fluidized bed boilers with a limited space and preliminary NOX discharging concentration being higher than 400 mg / Nm<3>.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler NO X Removal device, in particular to a method for reducing NO in circulating fluidized bed boiler flue gas by using ammonia injection and built-in catalyst X The discharge device is mainly applicable to the technical field of environmental protection, and can be applied to boiler denitrification. Background technique [0002] SNCR refers to the reduction of nitrogen oxides in the flue gas to harmless nitrogen and water by spraying a reducing agent in the "temperature window" suitable for denitrification reaction without the action of a catalyst. This technology generally uses ammonia, urea or hydrogen acid in the furnace as a reducing agent to reduce NO X , using NH 3 As a reducing agent, reduce NO in the temperature range of 900°C to 1100°C X The chemical reaction equation is mainly: [0003] 4NH 3 +4NO+O 2 →4N 2 +6H 2 O(1) [0004] 4NH 3 +2NO+2O 2 →3N 2 +6H 2 O (2) [0005] 8...

Claims

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Application Information

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IPC IPC(8): B01D53/90B01D53/56
Inventor 吴祖良孙春华孙培德徐少娟金孝祥龚晓翔
Owner 江苏富春江环保热电有限公司
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