摘要
以涿州热电2×350MW间接空冷供热机组为例,对1号机组,2号机组循环水泵运行方式进行优化,实现机组全工况最佳真空运行,供暖期,机组真空度增加,循环水泵耗电率降低。建立凝汽器的热力学模型与汽轮机背压变工况计算模型、多台循环水泵变频率运行计算模型,得出不同凝汽器水侧入口温度下,机组最佳经济背压,以及达到最佳经济背压时,变频循环水泵频率及组合方式。并应用DCS系统实现循环水泵实时自动控制。比较循化水泵运行优化前后供暖期机组的真空度及循环水泵耗电率;分析机组最佳背压运行的碳减排量。结果表明:对于间接空冷机组,通过变频循环水泵调节可实现机组全工况最佳背压运行,相比循环泵工频运行方式,在非供暖期的节能效果更为明显。
Taking Zhuozhou thermoelectric 2×Taking 350 MW indirect air cooling heating unit as an example,the operation mode of circulating water pump of unit 1 and unit 2 is optimized to realize the best vacuum operation of the unit under all working conditions.During the heating period,the vacuum degree of the unit increases and the power consumption rate of circulating water pump decreases.The thermodynamic model of the condenser,the calculation model of variable working condition of steam turbine back pressure and the calculation model of variable frequency operation of multiple circulating water pumps are established,and the optimal economic back pressure of the unit under different inlet temperatures at the water side of the condenser,as well as the frequency and combination mode of variable frequency circulating water pumps when reaching the optimal economic back pressure are obtained.DCS system is applied to realize the real-time automatic control of circulating water pump.Compare the vacuum degree of the unit and the power consumption rate of the circulating water pump in the heating period before and after the operation optimization of the water pump in Xunhua;Analyze the carbon emission reduction of the optimal back pressure operation of the unit.The results show that for indirect air cooling units,the optimal back pressure operation of the unit under all working conditions can be realized through the regulation of variable frequency circulating water pump.Compared with the power frequency operation mode of circulating pump,the energy-saving effect in non heating period is more obvious.
作者
白玉莲
王斌
刘绍杰
曹欢
BAI Yu-lian;WANG Bin;LIU Shao-jie;CAO Huan
关键词
火力发电厂
热电联产
碳减排
变频循环水泵
自动控制
thermal power plant
cogeneration
carbon emission reduction
frequency conversion circulating water pump
auto-control
作者简介
白玉莲(1988-),女,工程师,本科,从事火力发电厂科技管理、节能管理等工作。
