利用风能改变凝结水温度对火电机组热经济性影响的研究  

The Influence of Utilizing Wind Power to Heat Condensed Water on Thermal Efficiency of Coal-fired Power Plant

作　　者：刁姝文 曾德良[1] 胡勇[1] 

机构地区：[1]华北电力大学,工业过程测控新技术与系统北京市重点实验室,北京102206

出　　处：《汽轮机技术》2014年第5期367-370,共4页Turbine Technology

基　　金：国家科技支撑计划子课题燃煤电站经济安全运行关键技术研究(2011BAA04B03)

摘　　要：针对目前电网大规模弃风问题,为了提高风电利用率,合理利用风电资源,提出了一种利用不能并网的风电通过热熔炉加热凝结水的方法。以小扰动理论为基础,利用热经济性状态方程,通过对汽轮机回热系统和凝汽器特性的分析,研究凝结水温度变化对火电机组经济性的影响。以某典型600MW水冷机组为例,讨论了此方法的热力学特性和节能效果。结果表明:通过不能并网风电加热低压凝结水,可以减少汽轮机末级抽汽量,提高系统的热经济性,节约燃煤量,对于火电机组开发节能潜力具有积极的意义。For the problem of the abandoned large-scale wind power currently, in order to improve the utilization of wind power and make full use of wind resources, a method of using wind power to heat the condensed water through electrothermal furnace is proposed. On the basis of small disturbance theory, through analyzing the regenerative heating system of thermal power plant and the characteristics of condenser, the influence of condensed water temperature on the economy of thermal power plant is studied. This paper,taking a typical 600MW water cooling unit as an example,discusses the characteristics of steam turbine and energy-saving effects of this method. Results show that obvious economic effects can be obtained through non-grid-connected wind power heating the low-pressure condensed water, which can reduce the steam extraction flow from last stage of steam turbine ,improve the thermal efficiency of thermal power plant and save the amount of coal. It has positive significance to digging energy-saving potential of plant.

关 键 词：小扰动理论 凝结水温度 热经济性分析 非并网风电 

分 类 号：TK269.2[动力工程及工程热物理—动力机械及工程]