摘要
为了揭示系统部件损分布进而探讨机组节能潜力,在深入分析各部件流特性的基础上,提出了火电机组热力系统与设备损分布的通用矩阵模型.将整个热力系统分为5个控制体,针对每一控制体建立质量平衡与平衡方程,再按各控制体流方向依序相连各控制体级模型构成机组矩阵模型.与已有的回热系统损分布矩阵相比,新建模型可量化评价系统中每一过程(或设备)的热力性能,并全面反映系统及各辅助系统的影响.实例结果表明,热力系统中不可逆性主要来源于锅炉,其损率达50.28%.所建模型准确便捷,适用于各类火电机组;损分布规律清晰,有利于挖掘各设备(或过程)的节能潜力;可为火电机组优化设计及经济运行提供有效工具.
To reveal the exergy destruction distribution of components and then to explore the potential energy-saving of unit, on the basis of exergy flow analysis of each component, a general matrix model of exergy destruction distribution of thermodynamic system and its components for the coal-fired power unit is proposed. The entire thermodynamic system is split up into five control volumes, and each con- trol volume model is established by mass balance and exergy balance equations. The control volume models are linked to constitute a matrix model of power unit according to the direction of the exergy flow. Compared with available data reported, the matrix model can be used to assess the performance of every process or component of the system and it reflects the influences of the main system and all auxiliary systems roundly. It is observed that major source of irreversibility in the system comes from the boiler, which contributes to an exergy destruction of 50. 28%. The matrix model has the advantage of accuracy and convenience and it is suitable in all types of thermal power unit. It provides the exergy destruction distributed rule clearly and helps to find a way to realize energy saving potential. And it is a promising tool for the optimum design and economic operation of power units.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第5期1043-1048,共6页
Journal of Southeast University：Natural Science Edition
关键词
火电机组
热力系统与设备
损分布
通用矩阵模型
coal-fired power unit
thermodynamic system and its components
exergy destruction distribution
general matrix model
