湿污泥掺烧量对抽烟气干化污泥耦合发电机组影响  

Effects of wet sludge amount on sludge-coal co-combustion generation unit using extracted flue gas to heat sludge

作　　者：王一坤[1] 邓磊[2] 柳宏刚[1] 周凌宇[1] 周平[1] 魏星[1] WANG Yikun;DENG Lei;LIU Honggang;ZHOU Lingyu;ZHOU Ping;WEI Xing(Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安热工研究院有限公司,陕西西安710054 [2]西安交通大学动力工程多相流国家重点实验室,陕西西安710049

出　　处：《热力发电》2020年第11期47-54,共8页Thermal Power Generation

基　　金：中国华能集团有限公司总部科技项目(HNKJ18-H09)。

摘　　要：为了掌握湿污泥掺烧量对抽烟气干化污泥耦合发电燃煤机组锅炉运行参数的影响,针对某电厂300 MW等级燃煤机组,以能量守恒定律为基础,通过热平衡和热力校核计算分析了机组在BMCR、75%THA、50%THA和30%THA工况时,从低温过热器出口抽烟气干化污泥并进行掺烧时的烟气抽取比例、锅炉热效率、燃煤量、烟气温度、减温水量及烟气量等参数的变化规律。结果表明:掺烧污泥会导致锅炉主要运行参数的恶化,影响幅度随着负荷的降低和湿污泥掺烧量的增加而增大;综合考虑改造成本以及对锅炉运行参数和环保设备的影响等因素,建议全负荷工况下的湿污泥掺烧量不超过总燃料量的8%。This paper studies the effects of wet sludge amount on operational parameters of coal-fired boiler in which the sludge is dried by extracting flue gas,by taking a 300 MW unit coal-fired unit as the research object.On the basis of energy conservation equation,thermal balance and thermal check calculation is carried out to investigate the change rules of flue gas extraction ratio,thermal efficiency,coal consumption,flue gas temperature,spray water flux and gas flow under conditions of BMCR,75%THA,50%THA and 30%THA,when the flue gas is extracted from low temperature superheater outlet to heat the sludge.The results show that,blending sludge will cause deterioration of the boiler’s main parameters.The parameters variation increases when the boiler load decreases and the amount of wet sludge increases.Comprehensively considering the engineering cost and the influences on boiler parameters and environmental facilities,the percentage of wet sludge blending should be controlled below 8%under full load condition.

关 键 词：湿污泥 掺烧量 生物质 抽烟气干化 耦合发电 燃煤锅炉 热效率 

分 类 号：TK6[动力工程及工程热物理—生物能] X705[环境科学与工程—环境工程]