基于Aspen Plus的玉米芯气化制合成气系统设计及优化

Design and Optimization of a Corn Cob Gasification to Syngas System Based on Aspen Plus

本研究以玉米芯为原料,基于Aspen Plus提出了一种二段式气化重整反应系统,通过合理调整热解气化段和CO_(2)/H_(2)O混合重整段的反应条件,不仅能降低焦油的生成,协同消耗CO_(2)实现“碳负排放”,而且能将生物质定向转化为用于甲醇、甲烷合成的目标合成气.通过能量分析,在保证外界供能最小的条件下,研究发现,500℃热解,制取甲醇原料合成气(V_(H_(2))/V_(CO)=2)的最佳重整条件为N_(CO_(2))/N_(C)=0.5、N_(H_(2))/N_(C)=2、温度为770℃;制取甲烷原料合成气(V_(H_(2))/V_(CO)=3)的最佳重整反应条件为N_(H_(2))/N_(CO)=0、N_(CO_(2))/N_(C)=2、温度为770℃.

This study proposed a two-stage gasification and reforming reaction system based on Aspen Plus,utilizing corn cobs as the feedstock.By appropriately adjusting the reaction conditions of the pyrolysis stage and the CO_(2)/H_(2)O mixed reforming stage,the generation of tar can be reduced,and CO_(2)can be co-consumed to achieve"carbon-negative emissions".Moreover,the biomass could be selectively converted into target synthesis gas for methanol and methane synthesis.The energy analysis shows that,under the minimum external energy input,the optimal reforming condition for generating methanol synthesis gas(V_(H_(2))/V_(CO)=2)is N_(CO_(2))/N_(C)=0.5,N_(H_(2))/N_(C)=2,and 770℃,and that for generating methane synthesis gas(V_(H_(2))/V_(CO)=3)is N_(CO_(2))/N_(C)=0,N_(H_(2))/N_(C)=2,and 770℃.