A kind of sncr-based combined mercury removal method and device

Abstract

The invention provides an SNCR-based combined mercury removal device, which can effectively combine two flue gas treatment technologies, and achieve the purpose of denitrification and mercury removal while reducing costs. It includes two sets of independent metering systems, a set of solution preparation system connected to the output ends of the two sets of metering systems, and a solution delivery system and a solution injection system sequentially connected to the output ends of the solution preparation system; the solution injection system includes injection inlets and spray guns; The injection inlet is set on the furnace in the SNCR system, and the spray gun is connected to the injection inlet and extended into the furnace for setting; two sets of metering systems are used to measure urea and ammonium chloride solids according to the demand for removing NOx and zero-valent mercury . Combining mercury removal technology with SNCR to obtain the superiority of two-in-one technology and develop advanced SNCR technology. On the basis of the original facilities, no additional process equipment is added except for the metering system, making the process more simple, economical, and economical. Capital cost.

Description

technical field [0001] The invention relates to the technical field of flue gas combined pollutant removal, in particular to an SNCR-based combined mercury removal method and device. Background technique [0002] Due to its highly toxic, highly volatile, and accumulative properties in the biological chain, mercury has become a global circular polluting element, and has attracted 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, so the control of mercury pollution 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 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) is the main form of Hg emitted from coal-fired power...

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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 existing mercury removal technologies is relatively high. For example, the operating cost of activated carbon mercury removal is quite high. To achieve a mercury removal efficiency of 90%, it needs 25,000-70,000 US dollars per pound of mercury treated

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