Joint mercury removing method and device based on SNCR

A mercury removal and removal technology, applied in separation methods, chemical instruments and methods, mixers, etc., can solve the problems of difficulty in further improving denitration efficiency, high cost, and high operating costs, saving facility settings, improving efficiency, The effect of low initial investment cost

Active Publication Date: 2016-01-27
CHINA HUANENG GRP CO LTD +1
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Problems solved by technology

[0004] The current problem is that although the denitrification efficiency of the SNCR process is difficult to further improve, it has high flexibility and simplicity and can be used in combination with other technologies
In addition, the cost of ex

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  • Joint mercury removing method and device based on SNCR
  • Joint mercury removing method and device based on SNCR
  • Joint mercury removing method and device based on SNCR

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[0022] The present invention will be further described in detail below in conjunction with specific embodiments, which are for explanation rather than limitation of the present invention.

[0023] The present invention is a combined mercury removal method based on SNCR. Solid ammonium chloride and urea are added as raw materials to the SNCR system to form a mixed solution of urea and ammonium chloride, which is then injected into the corresponding flue through the SNCR system. NH obtained by thermal decomposition of urea and ammonium chloride 3 For NO in flue gas x Reductive removal is carried out, and zero-valent mercury in the flue gas is oxidized and removed by HCl obtained from the thermal decomposition of ammonium chloride. When solid ammonium chloride and urea are added as raw materials to the SNCR system, the solid ammonium chloride and urea are mixed according to the required ratio and then added or sequentially added according to the required ratio; the required ratio is ...

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Abstract

The invention provides a joint mercury removing device based on SNCR. Two kinds of flue gas treatment technologies can be effectively combined, and the purpose of nitrate and mercury removal is achieved while cost is reduced. The device comprises two sets of independent measuring systems, a solution preparing system connected to the output ends of the two sets of measuring systems, a solution conveying system and a solution spraying system, wherein the solution conveying system and the solution spraying system are sequentially connected to the output end of the solution preparing system. The solution spraying system comprises a spraying inlet and a spraying gun. The spraying inlet is formed in a hearth of an SNCR system, and the spraying gun is connected to the spraying inlet and stretches into the hearth. The two sets of measuring systems are used for measuring urea and ammonium chloride solids respectively according to the demanding amount for removing NOx and zero-valent mercury. The mercury removing technology and the SNCR are joined, the advantages of the two technologies are combined, the advanced SNCR technology is developed, additional technological equipment is not added except for the measuring systems based on original facilities, the technology is easier and more convenient to implement and more economical, and capital cost is saved.

Description

Technical field [0001] The invention relates to the technical field of flue gas combined pollutant removal, in particular to a combined mercury removal method and device based on SNCR. Background technique [0002] Because of its high toxicity, high volatility and accumulation in the biological chain, mercury has become a global circulating pollution element, and has received great attention from domestic and foreign scholars in recent years. Hg emissions from coal-fired power plants can account for 70% of man-made emissions. Therefore, the control of mercury emissions from coal-fired power plants has become another focus of environmental protection today. The average mercury content in coal in my country is about 0.22mg / kg, which is much higher than the world average level of 0.13mg / kg. Therefore, the mercury pollution control of coal-fired power plants in my country is facing a more severe test. Zero-valent mercury (Hg0) in Hg emissions from coal-fired power plants is the main...

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Application Information

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IPC IPC(8): B01D53/79B01D53/64B01D53/56B01F13/10B01F1/00
Inventor 向小凤张波张向宇高宁徐宏杰
Owner CHINA HUANENG GRP CO LTD
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