Applicability Analysis of High Back-pressure Heating Retrofit for Large-scale Steam Turbine Unit

被引：0
|
作者：
Ge Z. [1 ]
Sun S. [1 ]
Wan Y. [1 ]
Zhao S. [1 ]
He J. [1 ]
机构：
[1] Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education (North China Electric Power University), Changping District, Beijing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2017年 / 37卷 / 11期
关键词：
Application condition; Combined heat and power; Heat-to-electric ratio; Heating retrofit; High back-pressure;
D O I：
10.13334/j.0258-8013.pcsee.160641
中图分类号：
学科分类号：
摘要：
Large-scale steam turbine unit adopts high back-pressure heating method and hence can reduce the exergy losses of the extract steam, as well as extend the heating capacity of the unit due to utilization of exhaust heat. A theoretical model of cascade heating system with high back-pressure for 330MW air-cooled unit was established. The quantitative results of the application condition for heating retrofit were obtained by analyzing the dynamic effect of return water temperature of heating network on the performance of heating unit with high back-pressure. The results show that heating retrofit with high back-pressure is suitable for regions of low return water temperature and large heating area. When the return-temperature exceeds 59℃, the retrofit seems to be inappropriate. The heating capacity of the unit with high back-pressure is 24.8% higher than that of the traditional heating method using extraction steam. When the heating area reaches 10 million m2, the standard coal consumption rate is 138.7g/(kW·h), which can effectively alleviate the contradiction between regional electricity and heat. The research provides the basis for selecting the heating mode and can avoid the aimlessness of utilizing heating retrofit with high back-pressure. © 2017 Chin. Soc. for Elec. Eng.
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页码：3216 / 3222
页数：6
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