中国电机工程学报2017，Vol.37Issue(11)：3216-3222,7.DOI:10.13334/j.0258-8013.pcsee.160641
大型汽轮机组高背压供热改造适用性分析
Applicability Analysis of High Back-pressure Heating Retrofit for Large-scale Steam Turbine Unit
摘要
Abstract
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.关键词
热电联产/高背压/供热改造/适用条件/热电比Key words
combined heat and power/high back-pressure/heating retrofit/application condition/heat-to-electric ratio分类
能源科技引用本文复制引用
戈志华,孙诗梦,万燕,赵世飞,何坚忍..大型汽轮机组高背压供热改造适用性分析[J].中国电机工程学报,2017,37(11):3216-3222,7.基金项目
国家科技支撑计划项目(2014BAA06B01).The National Key Technology Support Program (2014BAA06B01). （2014BAA06B01）
