秸秆直燃发电系统的生命周期评价

Life cycle assessment on straw directly combustion for power generation system

以装机容量25MW的生物质秸秆直燃发电系统为评价对象,进行生命周期评价。结果表明,秸秆直燃发电1万kWh,可吸收CO22502.87kg,向环境排放SO237.39kg,NOx90.37kg,与燃煤发电相比,虽然氮氧化物的排放量有所增加,但减少了温室气体及硫氧化物的排放,污染物的排放主要发生在秸秆燃烧阶段。每发电1万kWh消耗能量15340.2MJ,秸秆预处理阶段是能量消耗的主要阶段,须要输入能量13830.5MJ。秸秆直燃发电过程对环境影响的总负荷为35.18人当量。在此过程中,烟尘居环境影响总负荷的首位。

The system of 25 MW straw directly combustion power generation has been evaluated by life cycle assessment. The results show that during the process of generating power, 10 000 kWh can absorb CO2 2502.87 kg, at the same time, the process releases SO2 of 37.39 kg, NOx of 90.37 kg to the environment. Although the emission of NOx has been increased, the system can reduce emissions of the greenhouse gas and SOx by comparison with the electricity generated from coal. The energy depletion is mainly from straw pretreatment; 13 830.5 MJ was needed in this stage. The emission of pollutants is mainly from the stage of combustion. In the whole process, Environmental Impact Load is 35.18 PET. In the system, the main impact on environment is from the emission of dust.