一级泵在区域供冷外融冰直供系统中的应用研究
Research on application of primary pumps to external ice melting direct supply systems for district cooling
摘要：
对区域供冷外融冰直供式系统的形式及水压图进行了分析,研究发现:对于设置上游供冷泵和外网循环泵的二级泵系统,当蓄冰池液面与系统管网最高点之间的高差较大时,可取消上游供冷泵,将系统改为一级泵形式,在不改变外网循环泵扬程的前提下,利用水泵前设备的阻力增加最不利点的压力,保证系统整体无负压运行;一级泵系统相比二级泵系统,节省了设备初投资及机房空间,并且水泵整体运行能耗有所降低。对一级泵系统的流量调节方式及系统运行策略进行了分析。结合实际项目案例,对比说明了一级泵系统的优势。
Abstract：
The form and water pressure diagram of the district cooling external ice melting direct supply system are analysed, and it is found that for the secondary pump system with a upstream cooling pump and a external network circulating pump, when the height difference between the liquid level of the ice storage tank and the highest point of the system pipe network is large, the upstream cooling pump can be canceled, and the system can be changed to the form of a primary pump, and the resistance of the equipment in front of the pump can be used to increase the pressure at the most unfavorable point without changing the head of the external network circulating pump, so as to ensure the overall operation of the system without negative pressure. Compared with the secondary pump system, the primary pump system saves the initial investment of equipment and the space of the machine room, and the overall operation energy consumption of the pump is reduced. The flow regulation mode and system operation strategy of the primary pump system are analysed. Combined with an actual case, the advantages of the primary pump system are compared and explained.
Keywords:district cooling; external ice melting direct supply system; primary pump system; water pressure diagram analysis; operation strategy