风口前端氧煤燃烧NO<i><sub>x</sub></i>生成行为分析及控制

doi:10.13228/j.boyuan.issn0449-749x.20220149

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Abstract Taking pulverized coal combustion process at the front end of blast furnace tuyere as the research object, the formation rules of gas composition and NO_x under different constraints were analyzed by thermodynamic calculation systematically. The effects of different operating parameters such as temperature, ratio of coal species, pulverized coal composition, oxygen-enriched and coal injection on NO_x formation behavior were discussed, and several directional advices to reduce NO_x formation were proposed. The results show that there are three ways to generate NO_x by pulverized coal combustion at the front end of blast furnace tuyere, thermal, prompt and fuel. Temperature is an important factor affecting the formation of thermal NO_x, when the temperature is higher than 2 000 ℃, the NO_x production at the front end of blast furnace tuyere increases by more than 30% for each 100 ℃ increase. Within the calculation temperature range (2 000-2 400 ℃), NO_xproduction increases from 4 056 mg/m³ to 12 942 mg/m³, which is far more than the traditional coal-fired boiler. The ratio of bituminous coal increases from 0 to 50%, NO_x production increases from 4 152 mg/m³ to 7 486 mg/m³, and the production content of NO_x increases by 80%. The ratio of bituminous coal increased from 0 to 50%, and production content of NO_x increased by 80%. When the coal ratio is 80 kg/t, NO_x production still reaches 18 006 mg/m³ even without rich oxygen. NO_x generation is significantly reduced by 68% when the oxygen supply for 1 mol carbon in pulverized coal decreased from 2.0 mol to 1.2 mol. Therefore, source control of NO_x generation can be realized by adjusting the theoretical combustion temperature, reducing the ratio of bituminous coal, using low volatile coal, reasonably matching the level of oxygen-enriched and coal injection. In addition, from the perspective of blast furnace NOx emission, the content level of NO_x in the top gas is also significantly affected by the internal reduction of the blast furnace: under normal smelting conditions, the generated NO_x can be fully reduced in blast furnace, and the NO_x content of the top gas of the blast furnace is usually below 50 mg/m³, but attention should be paid to the NO_x emission level of blast furnace gas and downstream gas users, when it is in the special operating mode such as low stock line, hanging, blowing-off, blowing-in, and so on.

Key words： blast furnace tuyere oxygen coal combustion NO_x formation reduction emission

Received: 03 March 2022

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	ZHEN Chang-liang
	CHENG Cui-hua
	ZHANG Qiao-rong
	ZHAO Kai

Cite this article:

ZHEN Chang-liang,CHENG Cui-hua,ZHANG Qiao-rong等. NO_x formation behavior analysis and control of oxygen coal combustion at front end of tuyere[J]. Iron and Steel, 2022, 57(10): 55-63.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220149 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I10/55

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