The district heating system that uses the hybrid operation of distributed variable speed pumps and regulating valves can effectively reduce the pressure level at the far-end of the heating network, while retaining the energy saving advantages of the distributed variable speed pump system and ensuring the safe operation of the heating network. In this study, pipe network optimization based on genetic algorithm was used to determine the pipe diameter required for the hybrid operation of distributed variable speed pumps and regulating valves. A mathematical model was established to evaluate the economic efficacy based on the annual equivalent cost. The zero-pressure difference point was evaluated to optimize the pipe diameter. A real pipe network was assessed to evaluate the efficacy of the method, and a sensitivity analysis of pressure constraints and economic factors was conducted. Our results show the system of hybrid operation of distributed variable speed pumps and regulating valves can reduce the annual equivalent cost by about 10.35% compared to the conventional central circulating pump system. In addition, the annual energy consumption due to heat loss and pump operation is only 0.36% higher than that of the conventional central circulating pump system.

采用分布式变速泵和调节阀混合运行的区域供热系统可以有效降低供热网络远端的压力水平，同时保留分布式变速泵系统的节能优势并确保安全加热网络的运行。在这项研究中，基于遗传算法的管网优化用于确定分布式变速泵和调节阀混合运行所需的管径。建立了一个数学模型以基于每年的等效成本评估经济效益。评估零压差点以优化管道直径。评估了真实的管网以评估该方法的有效性，并对压力限制和经济因素进行了敏感性分析。我们的结果表明，与传统的中央循环泵系统相比，分布式变速泵和调节阀的混合运行系统可以将每年的当量成本降低约10.35％。此外，由于热量损失和泵运行而产生的年能耗仅比传统的中央循环泵系统高0.36％。