以猪体为原料,以高位热值、C元素回收率、N元素残留率作为生物油质量指标,采用响应面法研究反应温度（220~300 ℃）、反应时间（40~80 min）、固含量（10%~30%）对猪体水热转化生物油产率与质量的影响。研究结果表明：反应条件均会影响水热反应的进行且温度影响最显著,分别在不同反应条件下得到单一指标最优的生物油;生物油的最大产率为76.94%（278 ℃、64 min、29%固含量）,最大HHV值为38.63 MJ/kg（290 ℃、47 min、30%固含量）,最大C元素回收率为93.16%（260 ℃、60 min、10%固含量）,最低N元素残留率为15.52%（220 ℃、40 min、12%固含量）。生物油的元素分析结果表明水热液化可有效降低生物油中N、O元素含量,提高生物油品质。傅里叶变换红外光谱分析与热重分析结果表明,生物油的化学成分复杂且以分子量较大、碳链较长的有机物为主。
Abstract
To investigate the effects of different parameters temperature （220 ℃-300 ℃）, reaction time （40 min-80 min）, total solid content （10%-30%） on the yields and qualities of bio-oil, Response surface method is used for analysis of hydrothermal liquefaction treatment process for pig carcass to obtain indicators of bio-oil quality such as higher heating value, C recovery rate and N residual rate. The results showed that all the reaction conditions have effect on hydrothermal reaction process, most of which is temperature. The bio-oil with the most satisfied single index was obtained from different reaction conditions. To be more specific, the highest yield of bio-oil obtained is 76.94% （278 ℃, 64 min, 29%）; the highest HHV obtained is 38.63 MJ/kg （290 ℃, 47 min, 30%）; the highest C recovery rate obtained is 93.16% （260 ℃, 60 min, 10%）, and the lowest N residual rate obtained is 15.52% （220 ℃, 40 min, 12%）. The elemental analysis of bio-oil shows that hydrothermal liquefaction can effectively reduce the content of N and O in bio-oil and improve the quality of bio-oil, meanwhile, the FT-IR and TG/DTG analysis shows that the chemical composition of bio-oil is complex and mainly composed of organic compounds with large molecular weight and long carbon chain.
关键词
水热液化 /
生物油 /
理化特性 /
工艺参数优化 /
猪体
Key words
hydrothermal liquefaction /
bio-oil /
physical and chemical properties /
parameter optimization /
pig carcass
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