秸秆发电系统能值分析

Energy Evaluation of Straw-based Power Generation System

利用能值分析方法对1 MW气化发电、5.5 MW气化发电和25 MW直燃发电3种典型生物质发电系统的可持续性进行了评价。在能值成本和能值收益概念基础上,引入了能值收益率和能值净收益两个指标。结果表明:利用单位能量的秸秆,5.5 MW气化发电系统能回收的能值最多且效率最高;1 MW气化发电系统的能值成本最低,但相应的能值收益也最小;和1 MW气化发电相比,25 MW直燃发电系统能值收益率较低而能值净收益较高。

Energy analysis was applied to evaluate three typical straw-based power generation systems： 1MW gasification and power generation system,5.5MW gasification and power generation system,and 25MW combustion and power generation system.Based on the concepts of energy costs and energy benefits,two indicators were employed： environmental yield ratio（EYR） and net energy.The results show that the 5.5MW system is the most efficient one in recovering energy from straw（the highest EYR） and is capable of saving the greatest quantity of energy per MJ of straw used（the highest net energy）;the 1MW system is the best one in terms of energy costs,but the worst in terms of energy benefits.Compared with the 1MW system,the 25MW system has a lower EYR but higher net energy.