PROCESS SIMULATION OF SINGLE-STEP DME PRODUCTION VIA BIOMASS GASIFICATION
In this paper, the direct DME synthesis via biomass gasification process was built and simulated. The influence of O/B and S/B on biomass gasification and synthesis performance was analyzed. The appreciated O/B was 0.370 in this study, corresponding to the gasification temperature of～ 850℃. The heat recovery steam generation (HRSG) system in the water gas shift (WGS) process could produce steam and could almost satisfy the power need in the purification process. The H2/CO ratio after the WGS process was modulated to 1 and the gas was transported to purification process to remove H2S and CO2. The Rectisol process was adopted in the purification process. A problem in the purification process was the large cold energy consumption. The syngas after purification had a trace amount in H2S and ～3％ CO2, which could satisfy the synthesis demand. The DME yield in this study is 0.37 when the DME selectivity is 0.91 and the CO was totally converted. Then, the environmental effect and economic was analyzed through the comparison with biomass direct combustion and DME from Natural gas (NG). DME synthesis and utilization from biomass showed great environmental advantages than biomass direct combustion, as the CO2 emission reduced greatly by ～ 27.6％ with no SO2 emission. The cost of DME from biomass is much lower than NG, as the Biomass/NG price ratio was less than 0.257 without consideration of other aspects effect on the DME production cost. Finally, a poly-generation process was introduced. The WGS reactor could be removed and the purification process could ae removed also based on the development of sulfur-resistant DME synthesis catalyst and allowance a wide CO2 concentration process. In the designed poly-generation process, the DME yield could reach 0.23 and the net electricity production could reach 39.67MW when the biomass consumption is 75.60t/h in this case.
Biomass Gasification Direct DME synthesis Environmental analysis Poly-generation
Fu-dong Ju Han-ping Chen Hal-ping Yang Xian-Hua Wang Ying-qiang Shen Shi-hong Zhang Zheng-hua Dai
State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,C East China University of Science and Technology,Shanghai,200237,China
国际会议
广州
英文
1156-1165
2008-12-03（万方平台首次上网日期，不代表论文的发表时间）