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以生产规模为1000t/a的玉米秸秆气化合成二甲醚系统为例,计算了系统整体能量效率及产生的温室效应。以玉米秸秆气化合成二甲醚系统为主要研究对象,采用常规能源对玉米秸秆气进行转化,使用生命周期分析方法(LCA)对玉米秸秆的生长、收集、压缩、气化及二甲醚的合成和利用等过程的温室效应及能耗进行了分析。结果表明,生产二甲醚的总能耗为产出二甲醚总能量的25%,玉米秸秆固定的二氧化碳为生产和使用二甲醚过程中排放的二氧化碳总量的77%,说明在玉米秸秆气化合成二甲醚及二甲醚的使用过程中存在着温室气体的排放,但与化石燃料相比,仍然有很大的减排作用。
Taking the production of 1000t / a corn stover gasification synthesis dimethyl ether system as an example, the overall energy efficiency of the system and the resulting greenhouse effect were calculated. The main research object is the synthesis of dimethyl ether by corn stalks gasification. Conventional energy sources are used to transform corn stalks gas. LCA is used to analyze the growth, collection, compression, gasification and dimethyl ether of corn stalks Synthesis and utilization of greenhouse processes and energy consumption were analyzed. The results showed that the total energy consumption for the production of dimethyl ether is 25% of the total energy output of dimethyl ether. The fixed carbon dioxide of corn stalks is 77% of the total amount of carbon dioxide emitted during the production and use of dimethyl ether, There are greenhouse gas emissions from the gasification of dimethyl ether and dimethyl ether, but they still have a significant emission reduction effect compared to fossil fuels.