串行流化床生物质气化合成二甲醚的模拟  

Simulation of DME Synthesis from Biomass Gasification in Interconnected Fluidized Beds

作　　者：江宏玲[1] 肖军[1] 沈来宏[1] 

机构地区：[1]东南大学热能工程研究所,南京210096

出　　处：《动力工程学报》2012年第5期408-413,419,共7页Journal of Chinese Society of Power Engineering

基　　金：国家重点基础研究发展规划资助项目(2010CB732206;2007CB210208)

摘　　要：以稻秸秆为研究对象,利用Aspen Plus软件建立了串行流化床生物质气化制取合成气合成二甲醚(DME)的模型,研究了不同气化温度、水蒸气与生物质的质量比(mS/mB)、DME合成温度、合成压力、吸收塔操作压力及吸收剂与DME的配比(nA/nD)对合成工艺的影响.结果表明:对于采用串行流化床生物质水蒸气气化技术制取DME的一步法合成系统,建议气化温度取750℃左右,mS/mB取0.3,DME合成温度取260℃,合成压力取4MPa,用水作吸收剂,吸收塔的操作压力控制在3～4MPa,nA/nD取0.5;在此工况下,1kg生物质(干燥基)所能产生的二甲醚物质的量约为6.1mol.Taking the rice straw as an object of study,a simulation model for synthesis of dimethyl ether（DME） from biomass gasification in interconnected fluidized beds was established using Aspen Plus software,so as to analyze how following factors influence the synthesis process,such as the gasification temperature,steam/biomass（mS/mB） mass ratio,synthesis temperature and pressure,absorption tower operating pressure and the absorbent/DME（nA/nD） flow ratio,ect.Results show that for the purpose of direct DME synthesis from biomass gasification in interconnected fluidized beds using steam gasification technology,it is suggested that relevant parameters be set as follows： gasification temperature at 750 ℃,mS/mB=0.3,and DME systhesis temperature and pressure respectively at 260 ℃ and 4 MPa;if water is taken as the absorbent,the absorption tower operating pressure is proposed to be within 3-4 MPa with an nA/nD ratio of 0.5.Under above optimal conditions,the DME yield may reach 6.1 mol per kg biomass.

关 键 词：二甲醚 串行流化床 生物质气化 一步法 ASPEN PLUS 

分 类 号：TK63[动力工程及工程热物理—生物能]