某超临界燃煤机组湿法脱硫系统降低厂用电率措施  

Measures for reducing station auxiliary power rate of WFGD system in a supercritical coal-fired unit

作　　者：徐鹏 严剑文 吴顺 XU Peng;YAN Jianwen;WU Shun(Jiangxi Ganneng Co.,Ltd.,Nanchang 330000,China)

机构地区：[1]江西赣能股份有限公司,江西南昌330000

出　　处：《热力发电》2021年第11期165-169,共5页Thermal Power Generation

摘　　要：介绍了脱硫系统的设计特点、运行情况及优化方案。对某电厂700 MW燃煤机组湿法烟气脱硫系统厂用电率主要影响因素,包括耗电设备、入炉煤含硫量、脱硫效率、脱硫系统运行方式、石灰石品质等进行分析,试验确定了脱硫系统降低厂用电率具体措施:调整2台锅炉的配煤方式;确定了不同负荷下脱硫效率及循环浆液泵最佳运行组合,将单台锅炉脱硫系统中循环浆液泵运行数量由原来的3~5台调整为2台;对吸收塔浆液喷嘴及支管进行清理疏通,降低循环浆液泵运行出口压力,有效提高了脱硫系统运行液气比,满负荷情况下吸收塔适应含硫量由0.87%提升到1.24%。优化措施实施后,全厂脱硫系统厂用电率从1.038%降至0.733%,脱硫系统运行经济性得到了改善。The design characteristics,operation situation and optimization scheme of the desulfurization system are introduced.Taking the wet flue gas desulfurization(WFGD)system of a 700 MW coal-fired unit as an example,the main factors affecting the station auxiliary power rate,including the power consumption equipment,sulfur content in the coal,desulfurization efficiency,desulfurization system operation mode,limestone quality,and so on,are analyzed.The specific measures to reduce the station auxiliary power rate of desulfurization system are determined,namely,adjusting the coal distribution mode of two boilers,determining the desulfurization efficiency and optimal operation combination of circulating slurry pump at different loads,adjusting the number of circulating slurry pump in a single boiler desulfurization system from 3~5 to 2,and clearing the slurry nozzle and branch nozzle of absorption tower,reducing the pressure at the circulating slurry pump outlet.After these measures were implimented,the liquid/gas ratio of the desulfurization system was effectively improved,the sulfur capacity of the absorption tower increased from 0.87%to 1.24%at full load,and the station auxiliary power rate of the WFGD system reduced from 1.038%to 0.733%.The operation economy of the WFGD system was improved.

关 键 词：燃煤机组 湿法脱硫 厂用电率 经济性 

分 类 号：TK02[动力工程及工程热物理]