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在生命周期的理论框架下,采用能值分析方法对2种秸秆能源化利用方式(秸秆直燃发电与秸秆燃料乙醇)的能值消耗、环境影响和经济效益进行了对比评价。结果表明:在秸秆直燃发电系统中,种植阶段能值投入占总能值投入的61.92%,远大于收储运输阶段和生产阶段;在秸秆燃料乙醇系统中,种植阶段和生产阶段所占比例较大,分别为45.26%和45.78%;秸秆直燃发电系统的CO2排放指标略小于秸秆燃料乙醇系统,远小于燃煤发电系统,因此,发展秸秆直燃发电和秸秆燃料乙醇对减少温室气体排放具有积极的意义;与秸秆燃料乙醇系统相比,秸秆直燃发电系统具有较高的能值产出率、可再生性和环境可持续性,较低的能值转换率和环境负载率,说明秸秆直燃发电系统综合效益优于秸秆燃料乙醇;秸秆直燃发电系统与秸秆燃料乙醇系统的可持续性指标均小于1,都不具有长期的可持续性。
Under the life cycle theory framework, the emergy evaluation method was used to evaluate the energy consumption, environmental impact and economic benefits of two kinds of straw energy utilization methods (straw direct combustion power generation and straw fuel ethanol). The results show that in the straw direct-fired power generation system, the emergy input in the planting stage accounts for 61.92% of the total emergy input, which is much larger than that in the storage, transportation, transportation and production stages. In the straw fuel ethanol system, the proportion of planting stage and production stage Which is 45.26% and 45.78% respectively. The CO 2 emission index of straw direct-fired power generation system is slightly less than that of straw fuel ethanol system, which is much smaller than that of coal-fired power generation system. Therefore, the development of straw direct-fired power generation and straw fuel ethanol to reduce greenhouse gas emissions Has a positive meaning. Compared with straw fuel ethanol system, straw direct-fired power generation system has higher emergy and environmental sustainability, lower energy conversion rate and environmental load, indicating that The comprehensive benefit of straw direct-fired power generation system is better than that of straw fuel ethanol. The sustainability indexes of straw direct-fired power generation system and straw fuel ethanol system are all less than 1, and do not have long-term sustainability.