多联产系统的能值评估

Emergy Evaluation of Polygeneration Systems

为了扩展能值分析方法的应用范围,根据能值分析的基本思想,并以能量守恒和能值守恒为依据,提出了能反映多联产系统特点的能值评价指标,该能值评价指标将多联产系统的成本结构、排放影响和节约的资源置于同样重要位置考虑。以煤基燃料-电力多联产系统(甲醇-电力,氢-电力)为案例进行了能值分析。结果表明:该能值评价指标能全面度量多联产系统及其可持续性;多联产系统的连接模式、技术配置等因素均影响着多联产系统的可持续性;合适的燃料-电力比例的多联产系统的可持续性与单产系统相比有明显改善。

For the purpose of extanding the application range of the emergy evaluation method, an emergy evaluation index, which can reflect the particular feature of polygeneration system, has been elaborated on the basis of energy and emergy conservation and guided by the fundamental principle of emergency analysis. With this index the cost structure, emission effect and energy saved are all considered on same level of importance. Taking coal as the basic fuel to be used, some power-polygeneration systems （methanol-power generation, by drogen-power generation ） are considered for the purpose of examplification. Analysis results show that emergy evaluation indices are practical for comprehensively evaluating polygeneration systems and their sustainability; which of joining, and the technologies made use of. The sustainability is influenced by factors like the polygeneration＇ s mode of polygeneration systems, that work on an appropriate ratio of fuel to electric power basis, is higher than that of singular production systems. Figs 4, tables 3 and refs ll.