作　　者： ; ; ; ; ; ;

机构地区： 中国科学院

出　　处： 《燃料化学学报》 2011年第8期595-599,共5页

摘　　要： 以玉米芯颗粒为原料在两段式固定床气化装置上进行了气化实验,考察了当量比ER、富氧浓度OC和水蒸气配比S/B对气化温度、气化气组分、低位热值、气体产率、气化效率和碳转化率等参数的影响,并比较了两段式固定床与传统下吸式固定床的气化特性。实验结果表明,当量比为0.27时H2的体积分数、CO的体积分数和气化效率达到最大值;增加富氧浓度能优化气化效果,但富氧浓度大于90%后,燃气质量和气化效率均提高不大;增加S/B能提高H2的体积分数,但同时会降低CO的体积分数、气体热值、气化效率;当S/B为0.6时,氢气的体积分数达最高值33.3%,H2/CO比为1.32;相比于传统固定床,两段式固定床气化可明显提高气化温度、氢气的体积分数、碳转化率和气化效率,降低焦油含量。 The experiments on the gasification of corncob chips with steam-oxygen enriched air was carried out in an atmospheric two-stage fixed bed gasifier.The effects of equivalence ratio（ER）,oxygen concentration（OC） and steam to biomass ratio（S/B） on the gasification temperature,gas compositions,lower heating value,gas yield,carbon conversion and cold gas efficiency were investigated,and the gasification characteristics between conventional downdraft fixed bed and two-stage fixed bed was compared.The results show that under the operating conditions of ER=0.27,H2 content,CO content and cold gas efficiency reach their maximums;Enhancing oxygen concentration can optimize the gasification performance,but it is less to further improve the fuel gas quality as the OC exceeds 90%.By increasing S/B,the H2 content,CO2 content and gas yield are increased,but the CO content,cold gas efficiency and carbon conversion are decreased.H2 content reachs maximum of 33.3% at the S/B of 0.6,while H2/CO ratio reachs 1.32.Compared with conventional downdraft fixed bed,the two-stage fixed bed has a higher gasification temperature,H2 content,carbon conversion,cold gas efficiency and a lower tar content.

关 键 词： 生物质 固定床 两段式气化 富氧 水蒸气

领　　域： [动力工程及工程热物理]