电站锅炉汽动引风机排汽接除氧器的热经济性分析  

Analysis of the Thermal Cost-effectiveness of the Exhaust Steam of the Steam-driven Induced Draft Fan of a Utility Boiler When Introduced into Deaerators

作　　者：杨燕玲[1] 石奇光[1] 金蓉[1] 翟淑伟[1] 

机构地区：[1]上海电力学院能源与环境工程学院,上海200090

出　　处：《热能动力工程》2013年第3期301-306,328-329,共6页Journal of Engineering for Thermal Energy and Power

基　　金：上海市科学技术科技攻关项目(10DZ0500800)

摘　　要：依据计算管道热效率的等效热降法,从能量系统作用角度阐述了蒸汽驱动引风机对全厂热效率的影响。引风机是火电厂中的高耗能辅机,采用蒸汽驱动可以有效地减少厂用电率,降低供电煤耗。在工程应用范围内,小汽轮机排汽进入除氧器会引起汽轮机绝对内效率的降低,同时由于附加蒸汽进出系统最终导致管道效率的降低。通过对不同汽源方案热经济性计算结果分析表明,改造方案3(汽源选自再热蒸汽热段)可使得供电煤耗最低,为最佳方案。By using the equivalent heat drop method with the thermal efficiency of pipelines being taken into account,the authors have described the influence of steam-driven induced draft fans on the whole plant thermal efficiency from the viewpoint of the functions of the energy system.Induced draft fans are high power consumed auxiliary equipment items in power plants.To use steam to drive induced draft fans can effectively lower the plant service power rate and reduce the power supply coal consumption rate.In the range of engineering applications,the introduction of the exhaust steam discharged from small-sized steam turbines into deaerators can lead to a drop of the absolute internal efficiency of the steam turbines and at the same time,the additional steam goes in and out of the system,finally resulting in a drop of the efficiency of the pipelines.An analysis of the calculation results of the thermal cost-effectiveness of different steam source versions shows that the modification version No.3(the steam in the reheat steam section was chosen as the steam source) can make the power supply coal consumption rate to reach the minimum,thus being regarded as the optimum modification version.

关 键 词：等效热降法 引风机 蒸汽驱动 能量系统作用原则 管道效率 

分 类 号：TK219[动力工程及工程热物理—动力机械及工程]