煤制气直接还原铁两段串联流程估算

为了降低直接还原铁能耗,根据试验数据研究了煤制气直接还原铁两段串联流程。串联流程中第一段竖炉用煤制气粗煤气余热和含碳球团冶炼直接还原铁,含碳球团以焦粉、半焦粉或无烟煤粉为还原剂,铁精矿、无机黏结剂混合后加压制作,电炉熔化直接还原、脱硫和生产水渣。串联流程中第二段竖炉以第一段净化后的炉顶煤气为第二段直接还原铁还原气,以氧化球团为原料。结果表明,煤制气直接还原铁两段串联流程估算能耗为394.8kg/t;与铁水比可比能耗为487.8kg/t,比高炉低41.2kg/t,生产过程中产生的污染物和温室气体排放低于高炉,接近天然气直接还原铁。

Estimation of two-section series DRI process using coal gas

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.