局部分布式变频泵优化供热运行及管网平衡调节实例
Example of locally distributed variable frequency pumps for optimal heating operation and network balance regulation
摘要：
以某市供热管网实际技改为例,通过水力计算、变工况分析、水泵合理选型,联合运行中继泵和局部分布式变频泵系统,并采用热网平衡控制策略实现阀泵联动,有效解决了管网输配不足的问题,系统循环流量增大了23.4%,进而供热量增大了32.3%,降低了系统压力,减少了管网泄漏风险。同时解决了末端用户资用压头低、流量分配不均的问题。利用案例中应用到的负荷分析和工况调节控制方法,以及运行中发现的多泵联合水力工况变化规律,可对该类系统的运行调节进行有效优化。
Abstract：
This paper takes the actual technical renovation of a heating network in a city as an example. Through hydraulic calculation, variable operation condition analysis, reasonable selection of water pumps, joint operation of the relay pumps and the locally distributed variable frequency pump system, and the heating network balance control strategy to achieve valve-pump linkage, the problem of insufficient transmission and distribution in the network is effectively solved, the system circulating flow increases by 23.4%, and the heating supply increases by 32.3%. It also reduces the system pressure and the risk of network leakage. At the same time, it solves the problems of low available pressure head for end users and uneven flow distribution. The load analysis and operation condition regulation control methods applied in the case, as well as the variation law of the hydraulic conditions of multi-pump combination discovered during operation, can be used to effectively optimize the operation regulation of this type of system.
Keywords:heating; distributed variable frequency pump; heating network balance; operation regulation; relay pump; scheduling