Online denitration process for sintering flue gas

A technology for sintering flue gas and denitrification, applied in the field of industrial flue gas purification process and sintering flue gas online denitrification process, can solve the problems of difficult disposal of waste catalyst, high operating cost, large denitration investment, etc. The effect of large diameter and low gas resistance

Active Publication Date: 2021-03-30
江苏集萃冶金技术研究院有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0041] Aiming at the problems of large investment, high operation cost and difficult disposal of waste catalysts in the existing sintering flue gas denitrification, the present invention provides a simple system, no outsourcing of catalysts, energy saving and consumption reduction, small footprint, flue gas denitrification equipment investment and operation A low-cost online denitrification process for sintering flue gas

Method used

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  • Online denitration process for sintering flue gas
  • Online denitration process for sintering flue gas

Examples

Experimental program
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Effect test

Embodiment 1

[0086] see figure 1 , taking a steel factory 450m 2 Take the sintering machine as an example, the sintering machine has 24 groups (48 pieces) of bellows 12 in total. Including the sintering air flow passing through the sintering material under the suction action of the fan (including the external exhaust gas fan 21-1, the high NOx flue gas fan 21-2, the desulfurization flue gas fan 21-3, and the low temperature flue gas fan 21-4) Layer 2, bottoming material 2.1, sintering machine 1 trolley 1.1 grate, bellows 12 below trolley 1.1 enter the main flue (including high temperature flue gas main flue 16-1, high NOx flue gas main flue 16-2, low temperature flue gas Gas main flue 16-3); along the traveling direction of 1 trolley 1.1 of the sintering machine, the sintering machine is divided into five areas: ignition area, low-temperature flue gas area, rapid flue gas heating area, NOx concentration rapid reduction area and high-temperature flue gas area area. The sintering mixture ...

Embodiment 2

[0094] see figure 2 , taking a steel factory 450m 2 Take the belt-type sintering machine as an example, the sintering machine has 24 groups (48 pieces) of bellows 12 in total. Adjust the operating process parameters of the sintering machine 1, reduce the thickness of the sintering material layer 2 by 10%, from the original 800mm to 720mm, or reduce the travel speed of the sintering machine trolley 1.1 by 10%, and correspondingly reduce the number of fans (including the exhaust gas fan) 21-1, high NOx flue gas blower 21-2, desulfurization flue gas blower 21-3, low temperature flue gas blower 21-4) extraction volume. By adjusting and changing the relative lengths of the ignition area, low temperature flue gas area, flue gas rapid temperature rise area, NOx concentration rapid reduction area and high temperature flue gas area of ​​the original sintering machine, the length of the adjusted high temperature flue gas area is increased to the sintering machine 1 is 40-45% of the t...

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Abstract

The invention discloses an online denitration process for sintering flue gas. According to the technical scheme, the sintering flue gas online denitration process comprises the steps that sintering gas flow enters a sintering material layer under the suction effect of a draught fan to be subjected to combustion-supporting sintering to form sintering flue gas, and the sintering flue gas penetratesthrough the sintering material layer, a sintering machine trolley grate and an air bellow to enter a main flue; a sintering machine is sequentially divided into an ignition area, a low-temperature flue gas area, a flue gas rapid heating area, a NOx concentration rapid reduction area and a high-temperature flue gas area in the advancing direction of the trolley; the sintering flue gas is collectedthrough a low-temperature flue gas main flue, a high-NOx flue gas main flue and a high-temperature flue gas main flue, the sintering flue gas of the low-temperature flue gas main flue is mixed with ammonia gas, the mixture is led into a low-temperature flue gas circulation cover above a sintering material layer in a high-temperature flue gas area through a low-temperature flue gas pipeline to enter the sintering material layer again; and temperature rise is conducted in the sintering material layer, and reduction denitration is carried out under the catalytic action of iron-based multi-oxidesrich in the sintering material layer. The process is simple, a denitration catalyst does not need to be purchased, the occupied area is small, and the operation cost is low.

Description

technical field [0001] The invention relates to an industrial flue gas purification process in the field of environmental protection, in particular to an online denitrification process for sintering flue gas. Background technique [0002] Since the 21st century, with the improvement of emission standards in the iron and steel industry, various iron and steel enterprises have successively provided desulfurization technology for the flue gas of sintering machines. By 2016, almost all existing sintering machines have been equipped with desulfurization devices. In recent years, with the stricter emission standards, various steel mills have built supporting denitrification facilities. Since steel mills have built desulfurization facilities for sintering flue gas in the early stage, when supporting denitrification facilities, generally adopt "synchronous denitrification in the already equipped wet desulfurization process", "separate denitrification devices in series" and "newly bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/86B01D53/56B01D53/78
CPCB01D53/8625B01D53/501B01D2258/0283B01D2255/20738B01D2251/2062Y02A50/20
Inventor 吴高明胡文才张艺许丽娟乔越卫书杰
Owner 江苏集萃冶金技术研究院有限公司
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