| 泵站漂浮物拦污栅拦截与过栅试验研究 |
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| 引用本文： | 仇宝云,刘地,袁连冲,赵通.泵站漂浮物拦污栅拦截与过栅试验研究[J].排灌机械工程学报,2022,40(6):582-587. |
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| 作者姓名： | 仇宝云 刘地 袁连冲 赵通 |
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| 作者单位： | 1. 扬州大学电气与能源动力工程学院, 江苏 扬州 225127; 2. 苏州市职业大学计算机工程学院, 江苏 苏州 215000; 3. 南水北调东线江苏水源有限责任公司, 江苏 南京 210000 |
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| 摘 要： | 泵站在进水前设置拦污栅拦截大体积漂浮物,避免因水泵缠堵造成流量、效率降低和电动机过载等现象.但为减小拦污水头损失和清污量,允许小体积漂浮物过栅通过水泵.拦污栅前单个漂浮物,一旦被拦污栅拦截,会导致后续小尺寸漂浮物被拦截概率增大.为掌握漂浮物拦污栅拦截与过栅特性,研究河道漂浮物特性,观测其运动状态,探究漂浮物过栅、拦截条件与规律.研究结果表明:漂浮物过栅概率与栅条间距、漂浮物大小、质地和水流流速等因素有关.漂浮物过栅概率随着物距比δ(漂浮物长度与栅条间距比值)的增大而减小,当物距比增大到某一临界值δc时,漂浮物过栅概率曲线趋向水平,即对于类型和大小一定的漂浮物,通过减小拦污栅栅条间距,可以降低过栅概率,但当δ=δc后,再增大物距比δ,对提高漂浮物拦截概率作用不大,相反会增大拦污栅造价和水力损失.研究结果对拦污栅和清污机设计与运行管理有重要意义.
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| 关 键 词： | 泵站 拦污栅 漂浮物 过栅概率 栅条间距 |
| 收稿时间： | 2020-10-07 |
Experimental study on floating objects being intercepted by and passing trash racks in pumping station |
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| QIU Baoyun,LIU Di,YUAN Lianchong,ZHAO Tong.Experimental study on floating objects being intercepted by and passing trash racks in pumping station[J].Journal of Drainage and Irrigation Machinery Engineering,2022,40(6):582-587. |
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| Authors: | QIU Baoyun LIU Di YUAN Lianchong ZHAO Tong |
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| Institution: | 1. College of Electrical and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, China; 2. College of Computer Engineering, Suzhou Vocational University, Suzhou, Jiangsu 215000, China; 3. The East Route of South-to-North Water Diversion Project Jiangsu Water Source Co., Ltd., Nanjing, Jiangsu 210000, China |
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| Abstract: | Trash racks shall be set in the pump station before water inflow to intercept large volume floating objects, so as to avoid flow, efficiency reduction and motor overload caused by water pump entanglement. However, in order to reduce the head loss of sewage interception and the amount of sewage removal, small floating objects are allowed to pass through the pump through the grid. If a single floa-ting object in front of the trash rack is intercepted by the trash rack, the interception probability of subsequent small-size floating objects being intercepted will increase. In order to master the characteristics of floats being intercepted by and passing the trash rack, the movement of typical floats in water flow was observed by experimental methods, and the conditions and general laws of floats passing and being intercepted by trash racks were explored. The investigation results show that the probability of floats passing through the trash racks is related to the grid spacing, the size and character of the floats and flow velocity. The probability of floating objects passing through the racks of floats decreases with the increase of object-spacing ratio δ(the ratio of the float length to the space between the rack bars). When the distance ratio δ increases to the critical value δc, the probability curve of floating objects passing through the racks tends to be horizontal. For the floats objects with certain type and size, the probability of passing through the racks can be reduced by reducing the spacing between trash rack bars under the condition that the floats which pass through the racks could pass through the pump impeller. However, when δ reaches the critical value δ =δc, increasing the object-spacing ratio δ by increasing the rack bar density has little effect on improving the probability of float interception, on the contrary, it will increase the cost and hydraulic loss of the trash racks. The research results of this paper are of great significance for improving the design and operation management of trash racks and trash cleaning machine. |
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| Keywords: | pumping station trash rack floating objects probability of passing racks rack bar spacing |
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