不同运行模式下燃气轮机冷热电三联供系统仿真研究

Simulation research on the CCHP system using gas turbine under different operation modes

首先结合建筑负荷和设备性能特性确定了天然气冷热电三联供系统设备组成,然后借助TRNSYS软件对以燃气轮机为动力的天然气冷热电三联供系统进行了建模及仿真,同时对“以热定电”和“以电定热”2种运行模式进行了设备容量计算、动态供能仿真和结果分析.研究发现:在满足区域冷热电负荷的条件下,“以电定热”运行模式下系统一次能源利用率平均值为66.83%,明显高于“以热定电”运行模式的系统平均一次能源利用率56.70%.基于综合建筑群负荷特性和系统设备特性,“以电定热”运行模式的一次能源利用率优于“以热定电”运行模式.“以电定热”运行模式下,系统制热量满足热负荷需求的时间占供暖季时间的90.84%,制冷量满足冷负荷需求的时间占制冷季时间的7.52%.

Considering the building load and the performance characteristics of the equipment,the equipment composition of the combined cooling heating and power(CCHP)system driven by natural gas is determined.Then the model of the CCHP system powered by gas turbine is built and the system is simulated by the TRNSYS.At the same time,the determination of the volume of the equipment,transient simulation of the energy supply and analysis of the results are conducted under two operation modes,namely,“determining power based on heat”and“determining heat based on power”.The results show that the average primary energy rate(PER)of the system with the mode of“determining heat based on power”is 66.83%.The value is higher than the average PER of 56.70%under the mode of“determining power based on heat”.Based on the load characteristics of the comprehensive building and the equipment characteristics of the system,the PER of the operation mode of“determining heat based on power”is better than that of“determining power based on heat”.Under the operation mode of“determining heat based on power”,the time of heat capacity to meet the demand of heating load accounts for 90.84%of the heating season,and the time of cooling capacity to meet the demand of cooling load accounts for 7.52%of the cooling season.