Method and apparatus for cleaning ash on surface of denitrification catalyst through fuel gas impact

Abstract

The invention discloses a method and an apparatus for cleaning the ash on the surface of a denitrification catalyst through fuel gas. According to the method, high-speed gas generated by combustion offuel gas in a burner is blown downward to a denitrification catalyst, the surrounding gas is entrained during the downward blowing to generate a high-speed mixed gas with a temperature of 300 DEG C,and the high-speed mixed gas passes through the catalyst to heat and clean the catalyst. The apparatus comprises a sliding rail, an igniter, a sliding arm, a burner, a mixer and a driving device, wherein the sliding arm is arranged on the sliding rail through a pulley, the sliding arm is a hollow pipe with both sealed ends, the burner is arranged on the sliding arm, a fuel gas inlet pipe is fixedly connected to the sliding arm, and is communicated to the sliding arm, the sliding arm is connected to the driving device, and the igniter is arranged below the sliding rail. According to the presentinvention, the ash deposition surface of the catalyst is impacted by using the high-speed gas flow generated by the flue gas volume expansion during the pre-mixing combustion of the fuel gas to cleanthe ash, such that the ash blowing effect is ensured, the efficiency is high, and the heating function and the ash cleaning function are integrated.

Description

technical field [0001] The invention relates to a gas cleaning method and device for cleaning catalyst surface dust and ammonium bisulfate, and belongs to the technical field of catalyst surface cleaning. Background technique [0002] Selective catalytic reduction (SCR) technology is currently the mainstream denitrification process in the world. Most of the denitrification of coke oven flue gas adopts the SCR method. Generally, the temperature of coke oven flue gas is 230-300 ° C. The flue gas treatment adopts the combination of denitrification + waste heat recovery + desulfurization. In actual operation, because coke oven flue gas contains sulfur dioxide and dust, dust and ammonium bisulfate tend to accumulate on the surface of the catalyst, resulting in reduced catalyst efficiency and deactivation. [0003] 1. Removal measures of catalyst surface dust [0004] The conventional treatment method is to install a soot cleaner in the denitrification tower to regularly clean t...

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Problems solved by technology

Because this will cause vibration of the dust accumulation surface, it will cause damage to parts such as boiler tubes, reduce their life, and increase the frequency of maintenance

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