钒钛磁铁矿冶炼高炉喷吹焦炉煤气的减排能力

doi:10.13228/j.boyuan.issn0449-749x.20220495

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Abstract Injecting coke oven gas (COG)into blast furnace can play the adequate role of hydrogen reduction to realize the low-carbon green development of blast furnace smelting. In order to analyze the emission reduction ability of coke oven gas injected into blast furnace, the quality and energy balance model was established based on the production data and physi-chemical reactions in the blast furnace smelting with vanadium titanomagnetites to explore the effects of COG injection on the theoretical combustion temperature of tuyere and CO₂ emission of top gas. Furthermore, the operation window under certain restrain conditions was established in order to discuss the carbon and emission reduction ability of COG injection. The results show that under a certain oxygen enrichment rate, coke ratio, coal ratio and air temperature, the theoretical combustion temperature of tuyere and the CO₂ emission of top gas decrease with increasing COG injection content. The heat in the blast furnace with COG injection can be supplemented by increasing the oxygen enrichment rate under the condition of fixed air temperature and coal ratio. The oxygen enrichment rate increases with the increase of COG injection content, and the coke ratio decreases. For the vanadium-titanomagnetite blast furnace without COG injection, the tuyere theoretical combustion temperature is 2 075 ℃, and the furnace top gas temperature is at least 120 ℃ under the operating conditions of oxygen enrichment rate 3%, coke ratio 380.0 kg/t(Fe), coal ratio 130 kg/t(Fe), and air temperature 1 200 ℃. When the injection volume of coke oven gas is 55 m³/t(Fe), the same theoretical combustion temperature and top gas temperature as that of blast furnace without COG injection can be obtained. Correspondingly, the oxygen enrichment rate is 5.63%, the coke ratio is 371 kg/t, and the top CO₂ emission is 684 kg/t(Fe); Compared with non-injection of COG, the coke ratio and CO₂ emission are reduced by 9 kg/t(Fe) and 27.1 kg/t(Fe), respectively. When the theoretical combustion temperature is 1 900 ℃ and top gas temperature is 110 ℃, the acceptable COG injection volume content for vanadium-titanomagnetite blast furnace is increased to 185 m³/t(Fe) with an oxygen enrichment rate of 4.9%. In comparison with non-injection of COG, a significant effect on carbon and emission reduction is obtained with the coke ratio reduced by 49.7 kg/t(Fe)and the CO₂ emission reduced by 103.0 kg/t(Fe).

Key words： coke oven gas injection hydrogen reduction mathematical model theoretical combustion temperature carbon and emission reduction

Received: 25 July 2022

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	Articles by authors
	ZHANG Shu-hui
	SHAO Jian-nan
	BI Zhong-xin
	HU Qi-chen
	Ly Qing
	QIE Ya-na

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ZHANG Shu-hui,SHAO Jian-nan,BI Zhong-xin等. Emission reduction ability of coke oven gas injection into blast furnace for smelting vanadium titanomagnetite[J]. Iron and Steel, 2023, 58(2): 39-46.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220495 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I2/39

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