生物质在超临界水中热解行为的初步研究
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摘要: 在间歇式高压反应釜中，考察了生物质（稻杆）在超临界水中的热解行为，研究了热解产物分布随反应温度、压力以及停留时间的变化规律。结果表明,气体收率随温度升高而增加，油收率则先增加后减少，380 ℃～410 ℃产油量较大，可达28.57%；气体收率和油收率随压力升高而增加，残渣收率则明显减小，但当压力高于31.5 MPa后，油收率基本不再随压力的升高而变化；气体收率随停留时间的延长而增加，油收率则先增加后减少。Abstract: Straw pyrolysis in supercritical water was studied using a high-pressure batch autoclave. The effects of temperature, pressure and reaction time on the distribution of pyrolysis products were examined. Results indicate that the yield of gas and oil increased with increasing temperature at first, and then oil yield decreased. The highest oil yield 28.57% was reached from 380 ℃ to 410 ℃. The yield of gas and oil increased with increasing pressure while the yield of residue decreased notably. When pressure is higher than 31.5 MPa, the yield of oil did not vary with pressure. The yield of gas increased with reaction time, and the yield of oil increased at first, and then decreased.
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Key words:
- biomass /
- pyrolysis /
- supercritical water
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