Experimental research on model compound reforming of biomass tar to produce H2-rich gas
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摘要: 以流化床作为反应器,进行生物质焦油模拟物(苯)催化重整制取富氢气体的实验研究,主要探究实验温度(780℃~900℃)、水蒸气/焦油模拟物质量比S/T (3.0~6.0)、床高(5.0cm~20.0cm)和床料(催化剂)对焦油模拟物重整制取富氢气体过程的影响。实验结果表明,焦油模拟物重整制取富氢气体的理想操作工况分别是温度为860℃~900℃,S/T 值为5.0,床层高度为15.0cm~20.0cm;通过比较,在上述理想操作条件下,合成的碱土金属催化剂(20CaAl)具有较好的催化活性,而其改性后的SCaFeNiAl催化剂具有更好的活性。在SCaFeNiAl作用下,焦油模拟物重整过程的活化能为58.87kJ/mol,指前因子为1.36×107h-1,且获得较好的实验效果,H2体积分数为67.28%,H2产率为303.50g/kg-tar,焦油模拟物转化率为95.93%,总气体产率为5.05m3/kg-tar。Abstract: The tar model compound (benzene) reforming to produce hydrogen-rich gas was investigated in a fluidized bed, where the steam acts as the gasification medium. The influences of operating parameters on producing hydrogen-rich gas were fully investigated by changing the reactor temperature, the ratio of steam mass to tars mass(S/T) and the bed height; in addition, the effects of various bed materials(catalysts) on the reforming reaction are also focused on in this paper. The reactor temperature was varied from 780℃ to 900℃, S/T from 3.0 to 6.0, and the bed height from 5.0cm to 20.0cm. The experimental results demonstrate that the optimum operating parameters for producing hydrogen-rich gas are the reactor temperature of 860℃~900℃, S/T of 5.0 and the bed height of 15.0cm~20.0cm. Under the condition of optimum operation, the synthesized alkaline earth metal-based catalyst (20CaAl) displays a better catalysis than natural ores(dolomite and limestone). And the modified catalyst SCaFeNiAl based on 20CaAl exhibits a higher catalytic activity with the activation energy of 58.87kJ/mol and pre-exponential factor of 1.36×107h-1. With SCaFeNiAl, the H2 content of 67.28%, the H2 yield of 303.50(g/kg-tar), the tar conversion ratio of 95.93% and the total gas yield of 5.05(m3/kg-tar) are obtained.
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Key words:
- biomass /
- tar model compound /
- reforming-reaction /
- hydrogen-rich gas /
- catalyst
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