生物质气化系统的(火用)值分析

摘要

Based on the latest progress of ecological thermodynamics,the exergy theory was firstly used to study biomass gasification system.With a 20 MW biomass gasification gas-steam combined cycle power generation project in Yancheng City,Jiangsu Province as study case,the ecological environment benefits was comprehensively analyzed.The exergy-based indicators of the biomass gasification system was calculated and compared with other renewable exergy conversion systems including wind power generation system,solar thermal power generation system,corn-ethanol production system and biogas system.The results showed that the total exergy inputs of the biomass gasification system is calculated to be 1.04E + 15 Jc/a,and exergy conversion rate is 2.64 Jc/J.Labor inputs are the main contributor to total exergy inputs,taking up 86.04％.Similar to other renewable exergy conversion systems,biomass gasification system is mainly supported by exergy purchased from outside.But it has advantages in sustainable development and eco-environmental benefits.%基于生态热力学的最新进展,首次采用(火用)值理论方法研究生物质气化系统.以江苏盐城某20MW生物质气化燃气-蒸汽联合循环发电工程为研究案例,采用(火用)值分析理论对其生态环境效益进行综合评价,并计算了系统的(火用)值评价指标,与风力发电系统、太阳能热力发电系统、玉米酒精生产系统和沼气综合利用系统这几个典型的可再生能源转化利用系统进行对比分析.结果表明,生物质气化系统的(火用)值总输入为1.04E+ 15 Jc/a,(火用)值转换率为2.64 Jc/J.人力劳务是生物质气化系统(火用)值投入的主要部分,占总(火用)值投入的86.04％.生物质气化系统与其他可再生能源系统类似,都主要依赖于外购的资源,但对可再生资源的利用较高,具有较好的发展持续性和生态环境效益.