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Emission reduction ability of coke oven gas injection into blast furnace for smelting vanadium titanomagnetite |
ZHANG Shu-hui1, SHAO Jian-nan1, BI Zhong-xin2, HU Qi-chen3, Ly Qing1, QIE Ya-na1 |
1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China;
2. Chengde Iron and Steel Company, Hebei Iron and Steel Group, Chengde 067002, Hebei, China;
3. MCC Jingcheng Engineering Technology Co., Ltd., Beijing 100176, China |
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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).
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Received: 25 July 2022
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