【摘要】 搭建了一套连续式多碟太阳能聚热与生物质超临界水气化耦合制氢系统,以生物质模型化合物(乙二醇、丙三醇、葡萄糖)为原料在该装置上进行了气化制氢实验,研究了太阳能直接辐照度(DNI)、物料成分、物料浓度、停留时间对气化效果的影响。实验结果表明:太阳能直接辐照度对太阳能吸收器腔内及反应器壁温的影响较大,进而能影响气化效果,在实验流量、压力范围内当DNI为363～656W/m2时,反应器出口流体温度达520～676℃,可以满足生物质超临界水气化制氢的温度及能量需要。0.1mol/L葡萄糖气化H2体积分数均值超过50%,H2产量为27.2mol/kg,气化率达109.7%。低物料浓度和长停留时间有利于气化效果的提高。实验验证了利用可再生的太阳能聚焦供热耦合生物质超临界水气化制氢是可行的。更多还原

【Abstract】 A continuous hydrogen production coupling system of multi-dishes concentrating solar thermal and biomass gasification in supercritical water(SCW) has been designed and constructed.Preliminary gasification experiments on biomass model compounds(ethylene glycol,glycerol,glucose) has been operated in the apparatus.Effects of direct normal solar irradiation(DNI),feedstock composition,feedstock concentration,residence time on gasification were studied.The results showed that DNI has prominent effect on the temperature of reactor wall and absorption cavity,thereby gasification results were affected.The outlet fluid temperature reached 520-676℃ when the DNI was 363-656W/m2,so the need of the energy and temperature for biomass gasification in supercritical water were met.As to 0.1mol/L glucose gasification,the average volume percentage of H2 is more than 50%,average H2 yield reached 27.2mol/kg,and the maximal gasification rate nearly 110% were reached.The feedstock with low biomass content and long residence time was easier to gasify.Experimental results validated that using solar energy as heat source to drive biomass gasification in supercritical water for hydrogen production is entirely feasible.更多还原