给水加热型联合循环系统分析研究  

STUDY ON EXERGY EVALUTION FOR FEEDWATER HEATING COMBINED CYCLE SYSTEM

作　　者：洪慧[1] 金红光[1] 刘泽龙[1] 蒋洪德[1] 蔡睿贤[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100080

出　　处：《中国电机工程学报》2003年第2期144-148,共5页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50176049;59925615);国家重点基础研究计划项目(G1999022302)

摘　　要：根据我国传统火电厂的实际情况,研究探讨给水加热型联合循环更新技术对火电厂进行系统升级改造问题。该文在ASPEN PLUS模拟给水加热型联合循环系统基础上,采用图象(火用)分析方法对给水加热型联合循环系统进行了深入的研究,揭示出引起循环系统(火用)损失的内部现象,并提出了系统进一步改进的建设性方案,为传统火电厂的系统升级改造、方案设计提供了理论依据。Based on repowering the existing coal - fired steam power plants in China, this paper investigates feed water heating combined cycle. Feedwater heating combined cycle system is simulated by using ASPEN PLUS software and its thermodynamic performance is evaluated and studied on the basis of graphical exergy analysis methodology. The exergy losses of heat transfer process and power process are mainly studied for feed water heating combined cycle system, and the distributions of exergy loss in those thermal processes are clearly identified. Some key points are found out to reduce exergy loss of internal system. As a result, the absolute thermal efficiency after repowering can be increased by 6.2 percentage points. Furthermore, we provide several feasible schemes for further system integration to improve the thermal efficiency of the combined cycle system. The results obtained here will provide theoretical basis for designing of repowering existing steam power plant from the viewpoint of system synthesis.

关 键 词：给水加热型联合循环系统 YONG分析 火力发电厂 热力系统 

分 类 号：TM621.4[电气工程—电力系统及自动化]