旋流限流阀在初期雨水截流中的应用
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摘要
在分析旋流限流阀截流雨水原理的基础上,通过中试研究了不同工作条件下旋流限流阀的雨水截流量,并利用SWMM模型模拟旋流限流阀对兰州新区某污水厂径流雨水的截流效果。结果表明,随着压力差的增大,旋流限流阀的雨水截流量先线性增长后缓慢增加,最后趋于饱和。旋流限流阀的口径越大,则重力流阶段和限流阶段的最大截流量就越大;安装角度越大,重力流阶段的最大截流量就越大,而限流阶段的最大截流量基本不变。旋流限流阀对研究区域的径流雨水具有很高的截流率,可以截流初期雨水、削减雨水径流峰值、推迟峰值到来时间。
Based on analyzing the principle of rainwater intercepting by rotational flow-limiting valve,rainwater interception by rotational flow-limiting valve under different operating conditions was researched by the pilot tests,and the effect of rotational flow-limiting valve on runoff interception of a wastewater treatment plant in Lanzhou new district was simulated by using SWMM model. The pilot tests showed that the rainwater interception of the rotational flow-limiting valve linearly increased at first and then increased slowly,which finally tended to be saturated with the increase of pressure differential. Bigger diameter of the rotational flow-limiting valve led to the larger maximal interception during gravity flow and limiting flow stages,and greater installing angle of the rotational flow-limiting valve resulted in the higher maximal interception during gravity flow stage,but the maximal interception was basically unchangable during limiting flow stage. High runoff retention rate of the rotational flow-limiting valve was achieved in the study area. Not only could it intercept the initial rainwater and cut down the runoff peak value,but also it could put off the flood peak appearance time.
Based on analyzing the principle of rainwater intercepting by rotational flow-limiting valve,rainwater interception by rotational flow-limiting valve under different operating conditions was researched by the pilot tests,and the effect of rotational flow-limiting valve on runoff interception of a wastewater treatment plant in Lanzhou new district was simulated by using SWMM model. The pilot tests showed that the rainwater interception of the rotational flow-limiting valve linearly increased at first and then increased slowly,which finally tended to be saturated with the increase of pressure differential. Bigger diameter of the rotational flow-limiting valve led to the larger maximal interception during gravity flow and limiting flow stages,and greater installing angle of the rotational flow-limiting valve resulted in the higher maximal interception during gravity flow stage,but the maximal interception was basically unchangable during limiting flow stage. High runoff retention rate of the rotational flow-limiting valve was achieved in the study area. Not only could it intercept the initial rainwater and cut down the runoff peak value,but also it could put off the flood peak appearance time.
引文
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[2]车伍,张炜,李俊奇,等.城市雨水径流污染的初期弃流控制[J].中国给水排水,2007,23(6):1-5.Che Wu,Zhang Wei,Li Junqi,et al.Initial split-flow control of urban rainwater runoff pollution[J].China Water&Wastewater,2007,23(6):1-5(in Chinese).
[3]张宏达,杨曦,何强.德国的截流井及相关设计[J].中国给水排水,2005,21(6):104-106.Zhang Hongda,Yang Xi,He Qiang.Intercepting well and the relative design in Germany[J].China Water&Wastewater,2005,21(6):104-106(in Chinese).
[4]翟计红.旋流限流阀在污水截流井中的应用[J].中国给水排水,2007,23(16):43-45.Zhai Jihong.Application of rotational flow-limiting valve in sewage intercepting chamber[J].China Water&Wastewater,2007,23(16):43-45(in Chinese).