辅机统调动力源系统在某660 MW机组的应用  

Application of Unified Power-Regulating System of Auxiliary Equipment on a 660 MW Unit

作　　者：牟春华[1] 吕凯[1,2] 许朋江 孙大伟[1] 兀鹏越 马汀山[1,2] 居文平[1,2] 李冬泉[3] MU Chunhua;LV Kai;XU Pengjiang;SUN Dawei;WU Pengyue;MA Tingshan;JU Wenping;LI Dongquan(Xi'an Thermal Power Research Institute Co.,Ltd.,Xi'an 710054,China;Xi'an TPRI Energy Conservation Technology Co.,Ltd.,Xi'an 710054,China;Huaneng Weihai Power Generation Co.,Ltd.,Weihai 264299,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]西安西热节能技术有限公司,陕西西安710054 [3]华能威海发电有限责任公司,山东威海264299

出　　处：《中国电力》2018年第9期65-72,共8页Electric Power

基　　金：中国华能集团公司总部科技项目(HNKJ15-H09)~~

摘　　要：以高转速变转速汽轮机和变频发电机为主组成的统调动力源系统,统一调节最佳运行频率比较一致的主要辅机设备,在减小系统节流损失提高传动效率的同时,系统更为集中、简单,便于维护。某660 MW机组采用变频驱动锅炉风机的统调动力源系统,通过性能试验掌握了系统运行特性,得到了不同负荷下最佳运行方式。THA、75%THA和50%THA工况最佳频率分别为47 Hz、41 Hz和41 Hz。在频率41～50 Hz范围内,统调动力源系统最优频率运行下机组供电煤耗较改造前风机工频运行状态下略有下降或基本持平,较变频运行状态略有增加,但厂用电率显著降低,机组净供电能力明显提升。随着运行频率降低,引风机、一次风机和送风机的运行效率有不同程度的提高。三大风机总耗功随运行频率呈近似线性关系:运行频率自50 Hz降低至最佳点,THA、75%THA和50%THA工况下总耗功分别降低了308 kW、816 kW和868 kW。The unified power-regulating system of auxiliary equipment(UPRS),which is mainly composed of variable-high-speed turbine and variable-frequency generator,adjusts the main auxiliary equipment with the same optimum operating frequency.It reduces the throttle loss of the system and improves the transmission efficiency,while the system is more centralized,simple and easy to maintain.A power source system of boiler fan driven by frequency conversion is adopted in a 660MW unit.The operating characteristics of the system are figured out through performance tests,and the optimal operating modes under different loads are also obtained.The best operating frequencies under THA,75%THA and 50%THA operating conditions are 47Hz,41Hz and 41Hz,respectively.Within the range of frequency 41~50Hz,the coal consumption of the unit when the power source system is operated under the optimal frequency is slightly less than or basically equal to that under the operation frequency before the transformation,and is slightly more than that with the variable frequency operation state,but the power consumption rate of the unit decreases significantly,and the net power supply capacity is also significantly improved.With the decrease of operating frequency,the efficiency of induced fan,primary fan and blower are improved to some extent.The total power consumption of the three blower fans is approximately linear with the operating frequency.The operating frequency is reduced from 50Hz to the optimal point,the total energy consumption is reduced by 308kW/816kW and 868kW respectively under the condition of 75THA and 50%THA.

关 键 词：燃煤发电机组 高转速变转速汽轮机 变频发电机 统调动力源系统 统一调节 运行效率 供电煤耗 

分 类 号：TK01[动力工程及工程热物理] TM621[电气工程—电力系统及自动化]