| Cite this article: | 杜思琦,韩启彪,兰晋慧,等.手摇清洗网式过滤器水力性能试验研究[J].灌溉排水学报,0,():-. |
| DU Siqi,HAN Qibiao,LAN Jinhui,et al.手摇清洗网式过滤器水力性能试验研究[J].灌溉排水学报,0,():-. |
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| Experimental study on hydraulic performance of the hand-operated cleaning screen filter |
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DU Siqi1, HAN Qibiao1, LAN Jinhui2, GUO Zhixin1, LI Hui1, HUANG Xiuqiao1
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1.Farmland Irrigation Research Institute,Chinese Academy of Agricultural Sciences/ Key Laboratory of Water-saving Agriculture of Henan Province/ Key Laboratory of Water-saving Irrigation Engineering,Ministry of Agriculture;2.Beijing Xinhua Water Saving Products Certification Co,LTD
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| Abstract: |
| 【Background】Drip irrigation has been one of the most effective irrigation technologies in the worldwide by far to improve the water use efficiency, however, the drippers are likely to be clogged by small particles of irrigated water. To alleviate this problem, technical filters are usually set up in the forepart of the drip irrigation system. The hand-operated cleaning screen filter is a new type of semi-automatic cleaning screen filter, which costs small energy and would not stop filtering while doing cleaning, and it is being gradually applied to the micro-irrigation engineering in China.【Objective】The objective is to analyze the performance of the hand-operated cleaning screen filter, including its head losses ( energy consumption) and cleaning capability, and thus to provide technical support for the selection of micro-irrigation filters.【Method】2 types of exiting hand-operated cleaning screen filters (A and B) were taken as the subjects. The head loss tests of filters under different flow rates with clean water were conducted to obtain the head loss curves; the performance tests using sand water mixture with different flow rates and sediment concentrations were conducted to analyze the filtering efficiency; the cleaning efficiency tests were also carried out using filter B to detect the cleaning ability. 【Result】The head loss curves for cleaning water accord with the power function. The head loss of filters for sand water mixture climbs with increase of flow rate and sediment concentration. The influence of flow rate on the head loss is more significant than that on the clogging degree, while the influence of sediment concentration on the clogging degree is as obvious as that on the head loss. For both 2 filters, the head loss for cleaning water is less than 2 m, the condition of 30 m3/h in flow rate and 0.08 g/L in sediment concentration result in more interceptions and 0～200 μm small particles. Filter A has more steady change of head loss and more interceptions, while filter B has slower change of head loss and clogging degree, as well as longer filtration cycle. After cleaning, the filtering screen is as clean as before, and the change law of head loss is basically the same as before as well.【Conclusion】The hydraulic and filtration performance of the hand-operated cleaning screen filter is excellent, and it is suggested that filters should be selected according to different irrigation requirements and water source conditions. Besides, more experiments could be conducted to analyze the interaction of flow rate and sediment concentration, thus to find out the best working conditions of different filters. |
| Key words: micro-irrigation; the hand-operated cleaning screen filter; hydraulic performance; cleaning capacity |
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