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介绍了城市原生污水源热泵系统干渠取水工艺,给出了干渠开口方式及其水头损失计算方法,分析了重力流流量与引水管坡度等参数的关联关系式,指出了理论水深和实际水深的区别,推导得出了实际水深与开口位置、引水管位置参数的关系式,并进行了示例设计。研究表明,开口处流速宜取1.5~2 m/s,开口处的水头损失在180~330 mm之间,引水管的坡度应根据流量、管径和实际水深确定。
The water intake technology of the urban primary sewage source heat pump system was introduced. The method of calculating the opening of the main canal and its head loss were given. The relationship between the gravity flow rate and the gradient of the water intake pipe was analyzed. The difference between theoretical water depth and actual water depth was pointed out , The relationship between the actual water depth and the position of the opening and the position of the water pipe is deduced and an example design is made. The results show that the flow velocity of the opening should be 1.5-2 m / s and the head loss at the opening should be between 180-330 mm. The slope of the water intake pipe should be determined according to the flow rate, pipe diameter and actual water depth.