天然气冷热电联供系统的多目标优化

Multi-objective Optimization of Natural Gas CCHP System

以某酒店天然气冷热电联供系统作为研究对象,以运行模式、发电机组额定发电功率为设计变量,建立联供系统综合性能指标优化模型,对运行模式、发电机组额定发电功率进行寻优。运行模式包括以热定电、以电定热、热电结合,发电机组额定发电功率变化范围取300~2000 kW,综合性能指标的单项指标包括能效指标、经济指标、碳排放指标。综合性能指标均随发电机组额定发电功率增大而先减小后增大,存在最佳额定发电功率。对于该项目,以电定热的运行模式最优,发电机组最佳额定发电功率为550 kW。

Taking the natural gas CCHP system of a hotel as the research object,and taking the operation mode and the rated generating power of the generator set as the design variables,an optimization model for the comprehensive performance indicators of the CCHP system is established to optimize the operation mode and the rated generating power of the generator set.The operation modes include determining power by heat,determining heat by power,and combination of heat and power.The variation range of the rated generating power of the generator set is 300-2000 kW.The single indicators of the comprehensive performance indicator include energy efficiency indicator,economic indicator and carbon emission indicator.The comprehensive performance indicator decreases first and then increase with the increase of the rated generating power of the generator set,and there is an optimal rated generating power.For this project,the operation mode of determining heat by power is optimal,and the optimal rated generating power of the generator set is 550 kW.