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Ejection device for realizing SNCR (selective non-catalytic reduction) with CFB (circulating fluidized bed) furnace and using method

A spray device and spray gun technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of complex equipment, high investment and maintenance costs, low operation reliability, etc., and achieve good operation stability and smoke. Low air resistance and reliable operation

Inactive Publication Date: 2012-07-18
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are some SNCR methods, but these methods often need to install spray guns at different equipment positions to achieve appropriate denitrification efficiency, and for boilers above 300MW, long guns are required to meet the requirements of mixing uniformity, and the process requires layout space. High requirements, complex equipment, high investment and maintenance costs
At the same time, the existing injection device for injecting denitrification agent has the problems of low denitrification efficiency and low operational reliability.

Method used

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  • Ejection device for realizing SNCR (selective non-catalytic reduction) with CFB (circulating fluidized bed) furnace and using method
  • Ejection device for realizing SNCR (selective non-catalytic reduction) with CFB (circulating fluidized bed) furnace and using method
  • Ejection device for realizing SNCR (selective non-catalytic reduction) with CFB (circulating fluidized bed) furnace and using method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 , 2 , shown in 3, a kind of injection device that is used for selective non-catalytic reduction denitrification, denitration agent selects urea for use, comprises the spray gun 11 that is provided with compressed air channel and urea solution channel, and the compressed air pipeline that communicates with spray gun 11 respectively and The urea solution pipeline, the urea solution pipeline includes the urea aqueous solution storage tank 1 (stores 40-50% mass concentration of urea aqueous solution, which is equipped with a stirrer 2), the first filter group 3 , urea solution pump 4, static mixer 7, second filter group 8, between urea solution pump 4 and static mixer 7, also be provided with a return pipeline 5 leading to urea aqueous solution storage tank 1, the inlet of static mixer 7 The end is also communicated with the dilution water pipeline provided with the dilution water pump 6. The compressed air pipeline includes a compressed air source, a com...

Embodiment 2

[0037] Such as Figure 4 , 5 As shown, a method for using the above spray device for denitrification, the spray gun is arranged at the entrance of the cyclone separator, the spray gun is inserted into the furnace 0.1m to spray, the particle size distribution of the liquid mist sprayed by the spray gun is 0-100 μm, and the average particle size is 50 μm , the concentration of denitration agent is controlled at 20%, the denitrification efficiency is 60%, and the NOx emission is 65mg / Nm 3 (6%O 2 ).

Embodiment 3

[0039] Such as Figure 4 , 5 As shown, a method for using the above-mentioned spray device for denitrification, the spray gun is arranged at the entrance of the cyclone separator, the spray gun is inserted into the furnace for 0.2m spraying, the particle size distribution of the liquid mist sprayed by the spray gun is 0-100 μm, and the average particle size is 45 μm , the concentration of denitration agent is controlled at 15%, the denitrification efficiency is 70%, and the NOx emission is 45mg / Nm 3 (6%O 2 ).

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Abstract

The invention discloses an ejection device for realizing SNCR (selective non-catalytic reduction) with a CFB (circulating fluidized bed) furnace and a using method, and relates to a flue gas purifying and denitration device. The ejection device comprises an ejection gun, a urea solution pipeline and a compressed air pipeline, wherein the urea solution pipeline comprises a urea aqueous solution storage tank, a first filter group, a urea solution pump, a static mixer and a second filter group sequentially communicated through a pipeline; and the compressed air pipeline comprises a compressed air source, a compressed air buffer tank and a third filter group sequentially communicated through a pipeline. The denitration using method comprises the steps of placing the ejection gun at an inlet of a cyclone separator and inserting the ejection gun into a hearth for 0.05-0.5m for ejection, wherein the particle size of the liquid mist ejected by the ejection gun is distributed from 0-100 microns, and the average particle size is 30-50 microns. The ejection device disclosed by the invention has high denitration efficiency and reliable operation and is simple and easy to maintain. The denitration using method reduces the requirements of the technology on the placing space, simplifies the equipment and realizes low investment and maintenance cost.

Description

technical field [0001] The invention belongs to the field of a flue gas purification and denitrification device and an application method thereof. Background technique [0002] The emission of nitrogen oxides in our country is huge, and has become the second largest air pollutant after sulfur dioxide. The problems of acid rain, air quality, and ozone destruction in the atmosphere are becoming more and more prominent. At present, China has become the third largest acid rain area in the world after Europe and North America, which has caused serious environmental pressure to the sustainable development of my country's economy. [0003] The NOx emission of the CFB furnace itself is low. For a typical large-capacity CFB boiler, due to the lower combustion temperature and better air classification, the NOx emission can be reduced to 100-300mg / Nm 3 At present, the "Emission Standards of Air Pollutants for Thermal Power Plants" stipulates that the NOx emission limit of thermal powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/56
Inventor 张定海毛宇周棋叶茂杨志忠
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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