高炉低碳喷吹条件下回旋区质能平衡分析

doi:10.13228/j.boyuan.issn0449-749x.20230031

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Abstract Variation of tuyere injection parameters is a common feature of low-carbon blast furnace ironmaking technologies such as oxygen blast furnace and hydrogen rich gas injection. To deeply understand the change of raceway heat supply and bosh gas composition at low-carbon injection conditions, a raceway mass and energy balance model based on Cantera software is established, which considers the participation of the hot blast, co-injected gas, pulverized coal and coke. Effects of injection parameters including the co-injected gas flow rate and composition, hot blast flow rate and its oxygen concentration on the raceway theoretical combustion temperature and the volume and composition of bosh gas are explored. Based on the standard of maintaining reasonable theoretical combustion temperature and bosh gas volume, the conditional balance of injection parameters is explored. The results show that for CO+H₂ two-components gas injection, maintaining the total gas flow rate of 1 100 m³/t and the total oxygen flow rate of 300 m³/t can basically ensure reasonable raceway theoretical combustion temperature and bosh gas flow rate. The maximum co-injected gas volume increases with the increase in oxygen concentration of blast. Increase of H₂ content in co-injected gas would promote the formation of HCN in the raceway, resulting to a slight increase in raceway coke consumption and decrease in the theoretical combustion temperature. When CO+H₂+CH₄ three-components gas is injected, increase of CH₄ content would lead to significant decrease in theoretical combustion temperature and increase in bosh gas volume. For injection of oxygen-rich pyrolysis gas, coke oven gas and pure methane, which have different methane concentrations, an increase of 50 m³/t in the co-injected gas volume requires decrease in the total volume of blast and co-injected gas by 22, 30 and 85 m³/t, and increase in the total oxygen concentration by 2.0%, 2.5% and 8.5% respectively, to maintain the theoretical combustion temperature of (2 423±1)K and the bosh gas volume of (1 450±1) m³/t. Injection of cold gases would increase the coke consumption at the tuyere, but the reduction potential of bosh gas increases significantly, which can promote the indirect reduction and contribute to the decrease of carbon emission.

Key words： blast furnace iron making carbon emission reduction raceway theoretical combustion temperature bosh gas volume hydrogen-rich gas injection

Received: 18 January 2023

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	Articles by authors
	REN Mengmeng
	LIU Wenwen
	ZHAO Junxue
	PEI Yue
	XING Xiangdong
	SHI Ruimeng

Cite this article:

REN Mengmeng,LIU Wenwen,ZHAO Junxue等. Analysis on mass and energy balance of raceway at low-carbon injection conditions for blast furnace[J]. Iron and Steel, 2023, 58(7): 36-45.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20230031 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I7/36

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