淮水北调临涣工业园输水工程空气阀的合理配置

Reasonable layout of air valves on water conveyance pipeline for project of water transfer from Huaihe River to Linhuan Industry Area

淮水北调临涣输水管道工程线路长,线路平坦,考虑充水要求,设计在153个位置安装复合式空气阀,同时希望利用这些空气阀防止瞬变液柱分离。本文通过对1个典型水泵事故断电瞬变工况的数字仿真,研究空气阀参数的影响,包括不同微量排气孔径、高速进排气孔径及高速排气容许压差等。研究表明适当减小空气阀高速进排气孔径对于控制邻近线段的瞬态最小水压是有利的,并且通过大量计算研究,给出全系统空气阀的合理配置。

As the water conveyance pipeline for the project of water transfer from Huaihe River to Linhuan Industry Area is long with a flat route, the requirement of water filling is considered with the design of installing compound air valves on 153 locations, at the same time, these valves are expected to be used for preventing the transient liquid column separation. Through the digital simulation on the power failure transient condition of a typical pump accident, the impacts from the air valve parameters are studied herein, including the pore diameter of micro-air vent, the pore diameter of high-speed air inlet and outlet hole, the allowable pressure difference of air escape, etc. The study shows that it is favorable to decrease the pore diameter of the high-speed air inlet and outlet hole properly for controlling the transient minimum water pressure of the adjacent pipeline, furthermore, a reasonable layout of the air valves for the whole system is given through a large amount of calculations concerned.