猪体水热液化工艺参数优化及生物油特性分析

OPTIMIZATION OF PIG CARCASS HYDROTHERMAL LIQUEFACTION PROCESS PARAMETERS AND ANALYSIS OF BIO-OIL CHARACTERISTICS

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。

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 biooil 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.