Normal-temperature SCR denitration device and process for improving denitration efficiency of boiler

Abstract

The invention discloses a normal-temperature SCR denitration device and process for improving the denitration efficiency of a boiler. The device is arranged in an overhaul space of a boiler economizer. The device comprises non-standard catalyst units, a supporting structure and soot blowers. The non-standard catalyst units are arranged on the supporting structure, the end of the supporting structure is connected with the inner wall of a flue, the soot blowers are arranged at the top ends of the non-standard catalyst units, a sealing layer is arranged between every two adjacent non-standard catalyst units, and sealing pieces are arranged between the non-standard catalyst units on the edge and the flue. A sliding structure is arranged between the supporting structure and the flue. The maintenance space between the flue heating surfaces is fully utilized, SCR catalyst arrangement is realized by adopting a non-standard catalyst with relatively low height, the tail and the heating surface of a boiler do not need to be modified, and a reactor shell does not need to be additionally arranged. After an existing boiler with ultra-low NOx emission concentration distance and small emission standard line deviation adopts the device, the denitration efficiency of the boiler can be effectively improved by 10%-20%, and therefore the NOx emission concentration reaches the standard.

Description

Technical field [0001] This invention belongs to NO X The field of ultra-low emission technology specifically relates to a room temperature SCR denitrification device and process for improving the denitrification efficiency of boilers. Background technique [0002] At present, my country’s pollutant emission standards for coal-fired units have reached ultra-low emission standards, of which NO X The emission concentration requirement is less than 50mg / Nm 3 the following. The flue gas denitration technology mainly includes SCR selective catalytic reduction technology (abbreviated SCR), SNCR selective non-catalytic reduction technology (abbreviated SNCR) and so on. SCR is mostly used for denitration in pulverized coal boilers, and SNCR is mostly used for denitration in circulating fluidized bed boilers. [0003] Generally, SCR denitration technology has better denitrification effect, but it is necessary to modify the heating surface and flue direction of the boiler tail, so the trans...

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Problems solved by technology

Both of the above two denitrification technologies will cause problems such as high cost of transformation and waste of resources.

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