Low temperature continuous denitrification process for coke oven smoke and reactor thereof

Abstract

The invention discloses a low temperature continuous denitrification process for coke oven smoke and reactor thereof. The reactor is divided into 2-9 individual regions, in between the regions are installed with heat insulation facilities, inside each of the regions are arranged with denitrification catalyst, a rectification grille, a soot blower, a pressure difference transmitter, an air inflow pipe for coke oven smoke, and more. When ammonium bisulfate, ammonium sulfate and other sticky substances generated by the reaction of SO2 and NH3 in the oven smoke, consolidate by large amount on the catalyst surface, causing the drop of catalyst activity in certain region of the reactor, the air intake valve is closed for smoke in the associated region, and hot air supply is plugged into the associated region, speeding up the decomposition by heat of ammonium bisulfate, ammonium sulfate and other substances, the denitrification catalyst is regenerated, with no effect on the running of denitrification devices in the remaining regions. The present invention is simple to operate, safe and reliable, with less area occupied, and low operating cost.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a coke oven flue gas low-temperature continuous denitrification process and a reactor thereof. Background technique [0002] Coke oven flue gas is the waste gas produced after the combustion of coke oven gas, mainly SO 2 , NO x It is one of the most polluting industries. As the country pays more and more attention to air pollution control, the control of coke oven flue gas pollutants (especially nitrogen oxides) is imminent. [0003] The temperature of coke oven flue gas is usually low, between 200°C and 300°C. The current mature Selective Catalytic Reduction (SCR) denitrification technology in the power industry is suitable for flue gas temperatures between 300°C and 420°C. Therefore, conventional medium-high temperature SCR denitrification technology is not suitable for coke oven flue gas denitrification, and low-temperature denitrification catalyst...

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Problems solved by technology

Due to the large amount of coke oven flue gas, heating the flue gas requires a large amount of fuel, resulting in high operating costs, which are difficult to meet the needs of coking enterprises; using low-temperature denitrification catalysts to remove nitrogen oxides from coke oven flue gas, its removal The efficiency can meet the requirements, but the catalyst is easy to generate viscous substances such as ammonium bisulfate and ammonium sulfate when it interacts with sulfur-containing coke oven flue gas under low temperature conditions, which will block the catalyst pores and reduce the denitrification efficiency (research shows that when the exhaust gas temperature is lower than 270 ° C , ammonia easily reacts with sulfur trioxide to form ammonium bisulfate, ammonium sulfate and other substances; when the exhaust gas temperature is higher than 300°C, ammonium bisulfate, ammonium sulfate and other substances are easily decomposed to form NH 3 , SO 3 and H 2 O etc.)

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