双抽供汽机组供汽流程优化与能耗特性研究
Research on Steam Supply Process Optimization and Energy Consumption Characteristics of the Double-extraction Steam Supply Unit
刘苗苗 1刘明 1陈伟雄 1李卫东 2严俊杰1
作者信息
- 1. 西安交通大学动力工程多相流国家重点实验室,西安 710049
- 2. 中国华能集团清洁能源技术研究院有限公司,北京 102209
- 折叠
摘要
采用燃煤机组供应多参数的工业热负荷是提高能源利用效率的有效手段,供汽流程优化及变工况能耗特性是节能改造与运行优化的基础.本文以某1000 MW机组为案例,开展了双参数工业抽汽供应系统优化,对比了四种供汽方式在典型工况的能耗特性,发现冷再供中压、中排供低压在不同工况下的综合能效最优.进而,研究了机组冷再供中压、中排供低压,及冷再供中压、中排供低压这三种方式下全工况运行域内能耗特性的变化规律.发现机组的能效在运行域内差异大,例如,当双抽供汽模式下中压供汽量为223 t.h-1时,运行域内机组的最大和最小热效率分别为67.90％和50.45％.
Abstract
Supplying multi-parameter industrial heat loads is an effective method for coal-fired units to improve energy efficiency.The optimization of the steam supply process and energy consumption characteristics under off-design conditions are of great significance for energy-saving renovation and operation optimization.In this paper,with a 1000 MW unit as an example,optimization on the double-parameter industrial extraction steam supply system is carried out,and the energy consump-tion characteristics of four steam supply methods under typical operating conditions are compared.It is found that the energy efficiency of the heat mode with cold reheat steam for intermediate pressure steam(IPS)and intermediate pressure turbine(IPT)exhaust steam for low pressure steam(LPS)is the highest considering different operating conditions.Furthermore,the energy consump-tion characteristics in the operation domain under all operating conditions is studied under three modes,i.e.,the mode with cold reheat steam for IPS,the mode with IPT exhaust steam for LPS,and the mode with cold reheat steam for IPS and IPT exhaust steam for LPS.The energy efficiency of the unit varies greatly along with operation conditions in the operation domain.When the IPS mass flow under the double extraction steam supply mode is 223 t·h-1,the maximum and minimum energy efficiency in the operation domain are 67.90％and 50.45％,respectively.
关键词
热电联产/工业蒸汽/双抽机组/热效率/㶲效率Key words
CHP/industrial steam/double-extraction unit/energy efficiency/exergy efficiency引用本文复制引用
基金项目
中国华能集团有限公司总部科技项目(HNKJ19-H24)
国家自然科学基金(52022079)
出版年
2024
NETL
NSTL
万方数据