Thermodynamic calculation on yield of shaft furnace as COG pyrolysised with O2
ZHOU Yu-lu1, JIANG Xin1, WANG Xiao-ai2, ZHENG Hai-yan1, LUO Guo-ping3, SHEN Feng-man1
1. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China; 2. Technology Research Institute, HBIS Group, Shijiazhuang 050023, Hebei, China; 3. School of Materials and Metallurgy, Inner Mongolia of Science and Technolgoy, Baotou 014010, Nei Mongol, China
Abstract：The consumption of coke oven gas (COG) in the shaft furnace reduction process will affect the yield of metallic Fe. In order to better understand the relation between the COG consumption (pyrolysised with O2) and the yield of metallic Fe, the consumption of COG and the yield in shaft furnace process under ideal conditions were thermodynamically calculated. The calculation results show that, in the shaft furnace process, the COG consumption as a heat source is more than that as a reducing agent. There are two methods to supply the heat gap. The tendency of metallic Fe production is different from two different methods of heat compensation. In the case of directly supplying reformed COG, the yield of metallic Fe decreases with increasing formation temperature of metallic Fe. For a coke oven with a capacity of 120×104 t, as the formation temperature are 850 and 900 ℃, the corresponding annual yields of shaft furnace are 50.72×104 and 49.90×104 t/a. In the case of ZR technology followed by supplying extra COG, the yield of metallic Fe first increases and then decreases with increasing formation temperature of metallic Fe. For a coke oven with a capacity of 120×104 t, as the formation temperature are 845 and 900 ℃, the corresponding annual yields of shaft furnace are 56.69×104 t/a (maximum value) and 55.68×104 t/a. The findings from this work may provide guidelines for choosing optimal parameters for an actual shaft furnace process.
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2020, Vol. 55 
