[关键词]
[摘要]
为研究环境温度、热电负荷条件对联合循环热电联产全工况性能的影响,采用模块化建模方法对系统各部件建模,利用各部件参数的相互关系将各模型耦合得到联合循环热电联产模型,通过对比分析各环境温度下的机组特性得出结论:满负荷时,随环境温度的变化联合循环热效率存在最佳值,主要与凝汽器压力变化规律有关,凝汽器压力在环境温Ta=8 ℃时变化规律发生转变,联合循环效率在该温度下出现最佳值;变负荷运行时,底循环性能在高、中间和低负荷区域内的最佳环境温度不同;供热工况下,分析了热电联产机组不同评价指标下的最优供热方式,其中以经济效率作为热电联产评价指标时,在任何热负荷下都建议高电负荷运行。
[Key word]
[Abstract]
In order to study the influence of ambient temperature on gas turbine combined cycle with heat and power generation,firstly modeling the components of combined cycle with modular modeling method,then using the relationship of parameters of components to couple each model for the entire system, finally summarizing by comparing the characteristics of the units at various ambient temperatures At full capacity,there is an optimum combined cycle efficiency with the change of ambient temperature,which is mainly related to the change rule of condenser pressure.The change rule of condenser pressure turns at Ta=8 ℃,and the optimum combined cycle efficiency appears at this temperature.While operating at part load,the optimum ambient temperature of the bottom cycle performance is different in the high,middle and low load.At the heat supplying condition,the optimal heat supplying method is offered for the cogeneration unit when using different indexes to evaluate, such as operating at high electrical load to supply heat when the economic efficiency adopted as the evaluation index of cogeneration unit.
[中图分类号]
TK472+.5
[基金项目]
国家自然科学基金重点项目(51436006);国家自然科学基金青年项目(51306049)