某市中心地区无负压供水模拟研究

无负压供水技术作为二次供水的新型模式,节能效果显著,但在应用过程中管网压力稳定性的影响尚未明确,可能存在供水水压不稳定、供水不足或爆管的问题。应用EPANET软件模拟某市中心给水管网进行无负压供水,结果发现无负压设备工作时,无保护情况下无负压供水水量、设备接入管径、设备之间的距离都会对管网水压的变化产生一定的影响。当无负压供水设备接入管径小于DN300mm,或2个及以上无负压供水设备安装间距小于1 000m时,对管网周围用户用水压影响较大;单个或多个无负压供水点新增水量不宜超过区域水量的20%,否则也会产生较大影响。该结论为其他城市区域建设无负压供水系统提供了参考。

Study on Non-negative Pressure Water Supply Simulation in An Urban Center Area

As a new mode of secondary water supply,non-negative pressure water supply technology has significant energy saving effect.However,the impact of pipe network pressure stability in the application process is not yet clear,and there may be problems such as unstable water supply pressure,insufficient water supply or pipe bursting.The EPANET software was used to simulate the water supply network in a city center to supply water with negative pressure.The results show that when the equipment is working without negative pressure,the amount of water supply without negative pressure under the condition of no protection,the pipe diameter of the equipment and the distance between the e-quipment will have certain impact on the change of water pressure in the pipe network.When the access pipe diameter of non-negative pressure water supply equipment is less than DN300 mm,or the installation interval of 2 or more non-nega-tive pressure water supply equipment is less than 1000 m,water pressure of users around the pipe network will be great-ly affected.The amount of water added at one or more non negative pressure water supply points should not exceed 20%of the regional water volume,otherwise it will have a greater impact.The conclusion provides a reference for other urban areas to build water supply systems without negative pressure.