Estimation of two-section series DRI process using coal gas
SU Ya-jie1，CAI Mei-xia2，DU Ying-hu3，CHEN Shou-lin4
（1. Shanxi Coke Group Co.， Ltd.， Shanxi Coking Coal Group， Taiyuan 030024， Shanxi， China 2. Technology Center， Taiyuan Iron and Steel （Group） Co.， Ltd.， Taiyuan 030003， Shanxi， China 3. Original Gas Plant， Taiyuan Iron and Steel （Group） Co.， Ltd.， Taiyuan 030003， Shanxi， China 4. Original No.4 Institute， China Research Institute of Daily Chemical Industry， Taiyuan 030001， Shanxi， China）
Abstract：In order to reduce the energy consumption of the DRI process, the two-section series DRI process which based on the laboratory findings was researched. In the first section shaft furnace，the direct reduction iron was produced by using the raw gas preheating the carbon-containing pellet which was made up of the iron ore concentrate and inorganic binder and reduced by the coke，semi-coke or anthracite. The hot metal was first separated out from the melting direct reduced iron with electric furnace，and then the desulphurization process and the production of water slag were conducted. In the second section shaft furnace，the flue gas after purifying from the first shaft furnace was used to produce the direct reduced iron, and the raw materials were mainly pellets.The results showed that the estimation energy consumption of the tandem process was about 394.8 kg/t，and comparing with the hot metal， the comparable energy consumption was 487.8 kg/t which was 41.2 kg/t lower than the blast furnace process. The pollutant and CO2 emissions of the process were close to the natural gas process, and lower than BF process.
苏亚杰，蔡湄夏，杜英虎，陈寿林. 煤制气直接还原铁两段串联流程估算[J]. 中国冶金, 2017, 27(5): 27-32.
SU Ya-jie，CAI Mei-xia，DU Ying-hu，CHEN Shou-lin. Estimation of two-section series DRI process using coal gas. China Metallurgy, 2017, 27(5): 27-32.
2017, Vol. 27 
