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

A denitrification efficiency, boiler technology, applied in the direction of gas treatment, dispersed particle separation, membrane technology, etc., can solve the problems of high cost of transformation, waste of resources, etc., achieve the effect of small equipment investment, reduce construction investment, and improve denitrification efficiency

Pending Publication Date: 2020-05-15
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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

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Embodiment Construction

[0022] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but those skilled in the art understand that all the embodiments should not be used as limitations on the present invention. Any improvements or changes made within the scope of the present invention fall within the protection scope of the present invention.

[0023] A normal temperature SCR denitrification device used to improve boiler denitrification efficiency does not need to modify the heating surface of the boiler tail, nor does it need to increase the reactor shell, does not change the original flue gas flow direction, but uses existing heating surface tubes at all levels The maintenance space between the groups realizes the arrangement of the catalyst, thereby greatly reducing the construction and equipment costs.

[0024] Normal temperature type (temperature range 290℃~420℃) SCR c...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/8625B01D2258/0283
Inventor 李力时正海袁野高洪培王海涛
Owner HUANENG CLEAN ENERGY RES INST
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