褐煤超临界水气化制H2的实验研究
Experimental study on the hydrogen production by gasification of lignite in supercritical water
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摘要: 以褐煤为原料,采用间歇式高温高压反应釜,考察不同反应温度、反应压力和水煤质量比对褐煤超临界水气化制H2产率的影响,再对加入不同质量分数的Fe粉、Ni粉对制H2的催化效果进行研究.结果表明,反应温度的提高可以在很大程度上提高H2的产率,适宜的反应温度为405℃;反应压力对制H2的影响效果不明显,但较高的反应压力会略提高CH4的产率,适宜的反应压力为23 MPa;较高的水煤质量比有利于产生H2,但成本也会随之提高,适宜的水煤质量比为10:1;金属催化剂Fe粉和Ni粉的加入可明显提高H2的产率,当质量分数较低时,Ni粉的催化效果优于Fe粉,当质量分数较高时,Fe粉的催化效果更好.Abstract: The effect of different reaction temperature, reaction pressure and the ratio of water to lignite on the H2 production by gasification of lignite in supercritical water was investigated by using lignite as raw material and intermittent high temperature and high pressure reactor. Then, the catalytic effect of Fe powder and Ni powder with different mass fractions on the production of H2 was studied separately. The experimental results showed that the increase of reaction temperature could greatly improve the yield of H2. The suitable reaction temperature was 405℃. The effect of reaction pressure on H2 production was not obvious, but the higher reaction pressure would slightly increase the yield of CH4, the appropriate reaction pressure was chosen as 23 MPa; higher ratio of water to lignite was conducive to the production of H2, but the cost would also increase, the appropriate ratio of water to lignite was selected as 10:1; the addition of metal catalyst Fe powder and Ni powder could significantly improve the yield of H2. When the mass fraction was low, the catalytic effect of Ni powder was better than that of Fe powder. When the mass fraction was higher, the catalytic effect of Fe powder was better.
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Key words:
- lignite /
- supercritical water /
- gasification /
- hydrogen yield /
- catalytic effect
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