An integrated process for coke oven flue gas dry desulfurization, denitrification and purification

Abstract

An integrated process for dry desulfurization, denitrification and purification of coke oven flue gas. The coke oven flue gas first enters the dechlorination reactor to remove chlorine, fluorine and part of the smoke in the raw material, and then enters the desulfurization and denitrification reactor to further remove impurities in the raw material. After purification, the SO x Less than 10mg / m 3 , NO X Content less than 50mg / m 3 . This process can remove sulfide, nitride, fluorine, chlorine, dioxin, etc. at the same time, and has the characteristics of wide range of impurities removal, high removal precision, simple process, small pressure drop and temperature drop, less investment and low operating cost .

Description

technical field [0001] The invention relates to an integrated process for coke oven flue gas dry desulfurization, denitrification and purification, which belongs to the field of coal chemical industry. Background technique [0002] At present, my country's coke production capacity exceeds 680 million tons, and the annual output reaches more than 400 million tons, accounting for more than 70% of the global coke production capacity and output. It has become the world's largest coke producer and consumer. Furnace flue gas, calculated according to the content of sulfur dioxide in the coke oven flue gas of 250-500mg / Nm3 and the content of nitrogen oxides of 800-1300mg / Nm3, the emissions of sulfur dioxide and nitrogen oxides will reach 150,000-300,000 tons and 500,000 tons per year respectively. 10,000 to 800,000 tons. These substances are an important source of air pollutants. Therefore, if we want to win the battle to defend the blue sky, we must first solve the problem of desulfu...

AI Technical Summary

Problems solved by technology

This invention first raises the temperature for denitrification and then lowers the temperature for desulfurization. The increase and decrease of temperature will inevitably cause heat loss, and a large amount of flue gas from the gas heating furnace is required, so the practicability is not too strong

[0006] From the above introduction, it can be seen that the coke oven flue gas desulfurization and denitrification currently on the market has the disadvantages of complex process, low desulfurization and denitrification efficiency, large heat loss, and high energy consumption.

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