660 MW机组采暖蒸汽过热度与分级利用技术研究  

Research on Superheat Utilization and Graded Utilization Technology of Heating Extraction in 660 MW Thermal Power Plant

作　　者：宋振龙 SONG Zhenlong(CEEC Zhejiang Thermal Power Construction Co.Ltd.,Hangzhou 310020,China)

机构地区：[1]中国能源建设集团浙江火电建设有限公司,浙江杭州310020

出　　处：《工业加热》2022年第11期1-6,共6页Industrial Heating

摘　　要：某电厂对2×660MW超临界汽轮机进行供热增容改造,每台机从中低压连通管引出400 t/h采暖蒸汽对外提供采暖热负荷,采暖蒸汽压力1.0MPa.a,温度355℃。该蒸汽如直接去热网加热器与热网循环水换热并提升循环水温度,将存在过热度与可用能的浪费。为提高能源利用效率,增设2台抽汽背压机,利用改造后新增蒸汽的富余能量发电,同时对进入抽汽背压机的蒸汽进行分级利用加热热网循环水。确定了新增背压机的方案,计算了背压机和高背压凝汽器的主要技术参数,定量计算了改造后的主要技术指标及经济性。结果表明:增设抽汽背压机后在满足新增供热需求的同时,增加了机组综合供电能力,静态投资回收期约2年,没有技术风险与安全风险,因此方案可行性较好。There are 400 t/h heating steam is extracted from the connecting pipes of medium and low pressure for each turbine to provide heating heat load after a 660 MW supercritical steam turbine is reformed.The heating steam’s pressure is 1.0 MPa.a and the temperature is 355℃.If the heating steam goes directly to the thermal grid station to heat the circulating water,there will be a waste of superheat and available energy.In order to improve energy utilization efficiency,it is proposed to install two additional back pressure turbine to utilize the surplus energy of the heating steam to generate electricity,and at the same time,the steam entering the back pressure turbine is used to heat the circulating water of the heat network according to the energy level of the steam.In this paper,we present the design of the new installed back pressure turbine,make calculation of the technical parameters of the back pressure turbine and high back pressure condenser,the main technical datas and technical economics of the ransformation are also calculated quantitatively.The results show that the installation of the back pressure turbine will increase the power supply capacity of the plant while satisfying the new heating demand,and the static payback period is only about 2 years,without technical risk and security risks,so the design has a good feasibility.

关 键 词：采暖抽汽 过热度 可用能 分级利用 

分 类 号：TK114[动力工程及工程热物理—热能工程]