生物质焦油模拟物重整制取富氢气体实验研究

Experimental research on model compound reforming of biomass tar to produce H2-rich gas

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(5.0 cm～20.0 cm)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15.0 cm～20.0 cm;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58.87 kJ/mol,指前因子为1.36×107 h-1,且获得较好的实验效果,H2体积分数为67.28%,H2产率为303.50 g/kg-tar,焦油模拟物转化率为95.93%,总气体产率为5.05 m3/kg-tar。

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.