摘要:
通过热力学计算对流化床低温氢冶金技术进行了分析。传统流化床氢还原工艺气体消耗量大、设备利用率低。以生产1t金属铁为例,计算表明:矿粉预热时,对于全氢还原,当氢气温降为100 K时,氢气用量为6 394 m3;当氢气温降为200 K时,氢气用量为3 189 m3;对于富氢（CO含量为30%）还原,还原气温降为100 K和200 K时,还原气用量分别为4 367 m3和2 195 m3。因此,富氢还原的一次气体消耗量要低于全氢还原,受资源条件的限制,在我国应优先发展富氢还原。为了降低气体用量,低温氢冶金工艺应采用多级流化床,同时对矿粉进行预热。低温快速氢冶金工艺利用新型流化床对细微矿粉进行直接还原,可以使还原速度和气体利用率显著提高。
Abstract:
Low-temperature fluidized bed hydrogen metallurgy was studied by thermodynamics calculation in this paper.Traditional hydrogen metallurgy had the disadvantages of high gas consumption and low productivi- ty.The thermodynamics calculation indicates that under the condition of ore powder preheated,the consump- tions of hydrogen are 6 394 m3 and 3 189 m3,when the gas temperature drop is 100 K and 200 K respectively, while the gas consumptions are 4 367 m3 and 2 195 m3 for the part-hydrogen metallurgy（containing 30% CO）.Accordingly the primary consumption of reducing gas of part-hydrogen metallurgy is less than that of the exclusive-hydrogen metallurgy.Part-hydrogen metallurgy should be developed preferentially considering our gas resource.To reduce the gas consumption,the multistage fluidized bed reactor should be applied and the ore powder should be preheated for fluidized bed hydrogen metallurgy processes.The hydrogen metallurgy process of fast reduction of fine ore at low temperature can improve the gas efficiency and the reduction speed rate remarkably.
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