Abstract:COREX decarbonized top (CEG), as a high-quality hydrogen-rich gas, directly injected into blast furnace can effectively reduce the fuel consumption. A static model of blast furnace operation of CEG was developed. The effects of CEG injection on the raceway adiabatic flame temperature (RAFT), the amount and composition of bosh gas, the shape of raceway, the direct reduction degree, and the coke saving effect were studied. Furthermore, the acceptable quantities of CEG after increasing the blast temperature as a thermal compensation measure was investigated. The results showed that under no thermal compensation, with the increase of CEG injection, the RAFT decreases but the volume of bosh gas increases. The direct reduction degree decreases with the increase of CEG injection. Based on the standard of maintaining the RAFT and volume of bosh gas, when the blast temperature is increased by 30, 60, 90 ℃, the corresponding suitable CEG injection volume is 45.4, 85.5, 123.3 m3/t, respectively. After thermal compensation, with the increase of CEG injection, the blast volume decreases but the oxygen enrichment rate increases. The CO and H2 contents in the raceway increased with the increase of the injection volume of CEG. For every 10 m3/t increase of CEG injection volume, the reducing content in bosh gas is increased by 0.46 %, the direct reduction degree decreases by 0.006, and the coke is saved by 1.48 kg/t.
周恒, 徐坤, 姚舜, 寇明银, 吴胜利. 高炉喷吹COREX脱CO2顶煤气的数值分析[J]. 钢铁, 2021, 56(2): 57-62.
ZHOU Heng, XU Kun, YAO Shun, KOU Ming-yin, WU Sheng-li. Numerical simulation of injection of COREX decarbonized top gas to blast furnace[J]. Iron and Steel, 2021, 56(2): 57-62.
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