Method and system for double-heating SCR denitration of sintering flue gas

A technology of sintering flue gas and flue gas heater, which is applied in the direction of separation methods, chemical instruments and methods, and separation of dispersed particles, which can solve problems such as blockage and achieve the effect of flexible selection

Pending Publication Date: 2020-02-28
BEIJING JINGCHENGKELIN ENVIRONMENTAL PROTECTION TECH +1
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Problems solved by technology

[0017] In order to solve the problem of medium and low temperature SCR denitration heating GGH blockage, the present invention provides a sintering flue gas double heating SCR denitrification method and system

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  • Method and system for double-heating SCR denitration of sintering flue gas
  • Method and system for double-heating SCR denitration of sintering flue gas
  • Method and system for double-heating SCR denitration of sintering flue gas

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Embodiment Construction

[0045] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0046] The present invention provides a preferred embodiment, such as image 3 As shown, the sintering flue gas dual-heating SCR denitrification system includes the main exhaust fan 2, the head electrostatic precipitator 3, the desulfurization tower 7, the wet electrostatic precipitator 8, the GGH flue gas heat exchanger 4, and the SCR denitrification reactor. 6. The outlet of the SCR denitrification reactor 6 enters the GGH flue gas heat exchanger 4, and then connects the induced draft fan 9 and the chimney 10 in sequence;

[0047] The first flue gas mixer 12 is set at the entrance of the desulfurization side of the GG...

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Abstract

The invention discloses a method and a system for double-heating SCR denitration of sintering flue gas. The method comprises the following steps: desulfurizing the sintering flue gas, and mixing the desulfurized sintering flue gas with high-temperature flue gas for the first time; then allowing mixed flue gas to exchange heat with denitrated flue gas; mixing heat-exchanged flue gas with the high-temperature flue gas for the second time, and carrying out denitration; and subjecting the denitrated flue gas to heat exchange, and carrying out discharging. The method provided by the invention mainly solves the problem of GGH blockage after heating in medium-and-low-temperature SCR denitration; after desulfurization is completed, the denitrated flue gas is mixed and heated with the high-temperature flue gas for the first time, so wet flue gas is guaranteed to be changed from an unsaturated state to an overheated state, and the blockage probability of a heat exchanger is reduced; and secondary mixing and heating are carried out before the denitrated flue gas enters an SCR denitration reactor, so the reaction temperature of a catalyst is guaranteed, and the denitration efficiency is improved.

Description

technical field [0001] The invention relates to the field of industrial waste gas treatment, in particular to a double-heating SCR denitrification method and system for sintering flue gas. Background technique [0002] On April 28, 2019, the Ministry of Ecology and Environment, the National Development and Reform Commission, the Ministry of Industry and Information Technology, the Ministry of Finance, and the Ministry of Transport jointly issued the "Opinions on Promoting the Implementation of Ultra-Low Emissions in the Iron and Steel Industry" (hereinafter referred to as the "Opinions"). The extensive transformation of steel logistics has pointed out the direction and is an important measure to promote the high-quality development of the industry and the transformation and upgrading of the transportation structure. During the implementation process, iron and steel enterprises need to implement precise policies in combination with document requirements in order to achieve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56
CPCB01D53/8625B01D53/90
Inventor 张鑫丁勇山杨源满张金成王颖洁范硕
Owner BEIJING JINGCHENGKELIN ENVIRONMENTAL PROTECTION TECH
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