三联供系统中综合性能评价方法的应用研究

Study of the Applications of the Method for Evaluating the Comprehensive Performance of a Trigeneration System

针对目前燃气冷热电三联供系统在设计时忽略负荷变化的影响导致系统配置选型偏大的问题,以燃气内燃机的参考容量和运行策略为设计变量,选取包含年总运行费用、一次能源消耗量和二氧化碳排放量在内的综合性能指标为优化的目标函数,建立系统设计优化方法。运用此方法对天津市某酒店建筑的三联供系统进行分析设计,优化结果为:内燃机参考容量选取975 k W,按照以电定热的策略运行与分供系统相比,联供系统节约开支3.6%,节能28.9%,二氧化碳减排44.7%。

In the light of the problem that the influence of dynamic loads are currently ignored during the design of a gas cooling,heating and power trigeneration system and excessively large capacities given in the models of the equipment items chosen in the configuration of the system may result,with the reference capacity and operation strategies for the internal gas combustion engine serving as the design variables and the comprehensive performance indexes,including the total annual operation expenses,amount of primary energy sources consumed and the quantity of carbon dioxide emissions serving as the target functions for optimization,established was a method for designing and optimizing a system. By using the method thus established,an analysis and design of a trigeneration system for a building of a hotel in Tianjin city were conducted. The optimumization results are given as follows: the reference capacity of the inner combustion engine should be chosen as 975 k W and when the system is operating according to the strategy of 'determining heat generation on the basis of power demand',as compared with any single supply system,the trigeneration system can save expenses by 3. 6%,an amount of energy by 28. 9% and reduce the carbon dioxide emissions by 44. 7%.