A method for segmenting sintering flue gas and utilizing vertical cooling kiln to reduce emission of sulfur and nitrogen oxides

A technology for sintering flue gas and nitrogen oxides, which is applied in the field of sintering flue gas segmentation and the use of vertical cooling kilns to reduce sulfur and nitrogen oxides, can solve the problem of high penetration rate of sintering desulfurization devices, lack of feasible technologies for de-sintering and nitrification, and sintering. The problems of low utilization rate of mine sensible heat, etc., achieve the effect of significant comprehensive emission reduction, cost reduction, and efficient recovery.

Active Publication Date: 2019-08-23
钢研晟华科技股份有限公司
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Problems solved by technology

[0006] In view of the above analysis, the present invention aims to provide a method for segmenting sintering flue gas and utilizing vertical cooling kiln to reduce sulfur and nitrogen oxides, so as to solve the problem of low utilization rate of sensible heat of existing sintering ore and popularization rate of sintering desulfurization devices. Higher, the problem of lack of feasible technology for desintering and nitration

Method used

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  • A method for segmenting sintering flue gas and utilizing vertical cooling kiln to reduce emission of sulfur and nitrogen oxides
  • A method for segmenting sintering flue gas and utilizing vertical cooling kiln to reduce emission of sulfur and nitrogen oxides
  • A method for segmenting sintering flue gas and utilizing vertical cooling kiln to reduce emission of sulfur and nitrogen oxides

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Embodiment

[0052] Take a company 270m 2 Taking the sintering machine as an example, there are 24 bellows in total, and the flue gas concentration is shown in the table below.

[0053]

[0054]

[0055] Mix the flue gas in No. 1-14 sintering bellows to high NO X The mixture of denitrification flue gas and No. 15-24 bellows flue gas is high SO 2 Desulfurization flue gas, high NO after mixing X The flue gas volume of denitrification flue gas is 195,000 m 3 / h, temperature 88℃, SO 2 Concentration 88mg / m 3 , NO X Concentration 229mg / m 3 ; high SO 2 The flue gas volume of desulfurization flue gas is 241,000 m 3 / h, temperature 231℃, SO 2 Concentration 1491mg / m 3 , NO X Concentration 84mg / m 3 .

[0056] will be high NO X The denitrification flue gas exchanges heat with the hot sinter in the vertical cold kiln, and the temperature of the flue gas after heat exchange can reach 350 ° C ~ 450 ° C; the heat supplement is used to supplement the heat of the flue gas after heat exch...

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Abstract

The invention relates to a method of segmenting sintering flue gas and reducing emission of sulfur and nitrogen oxide by means of a vertical cold kiln. The method comprises the following steps: segmenting the sintering flue gas; carrying out heat exchange on high NOX denitrated flue gas and hot sinter in the vertical cold kiln; and employing a process of removing NOX by SCR and a process of removing SO2 by high SO2 desulphurized flue gas. By means of a novel cooling process of the sinter vertical cold kiln, the sensible heat resource of sinter can be recovered efficiently, and the method is ofimportant significance in comprehensive utilization of the sensible heat resource of sinter. Meanwhile, by combining the novel cooling process of the sinter vertical cold kiln with an existing maturedenitrating SCR process, a lot of extra heat needs not to be supplemented, the sensible heat resource of sinter is utilized more reasonably and fully, the sintering denitration cost is lowered, and anovel path is provided for sintering denitration.

Description

technical field [0001] The invention relates to the technical field of sintering flue gas treatment, in particular to a method for segmenting sintering flue gas and utilizing a vertical cooling kiln to reduce sulfur and nitrogen oxide emissions. Background technique [0002] my country's iron and steel production is dominated by the blast furnace-converter long process, and the proportion of converter steel reaches more than 90%. The proportion of sinter in my country's blast furnace charge structure reaches 70% to 75%. In 2014, my country's sinter output reached 901 million tons. SO emissions from the sintering process 2 and NO X Respectively accounted for steel production process SO 2 and NO X 60% and 50% of the emissions are the main polluting processes of iron and steel enterprises. In 2012, the Ministry of Environmental Protection promulgated and implemented the "Steel Sintering and Pelletizing Industry Air Pollutant Emission Standards" (GB28662-2012), adding NO X...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D17/00
Inventor 王海风张春霞郄俊懋林万舟严定鎏周和敏齐渊洪王锋高建军
Owner 钢研晟华科技股份有限公司
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