| 不同进气方式下气力提升泵水力特性理论模型与验证 |
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| 引用本文： | 左娟莉,李逢超,郭鹏程,孙帅辉,罗兴锜.不同进气方式下气力提升泵水力特性理论模型与验证[J].农业工程学报,2017,33(21):85-91. |
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| 作者姓名： | 左娟莉 李逢超 郭鹏程 孙帅辉 罗兴锜 |
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| 作者单位： | 西安理工大学西北旱区生态水利工程国家重点试验室培育基地,西安,710048 |
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| 基金项目： | 国家自然科学基金（11605136）；陕西省自然科学基础研究计划（2017JQ5040）；陕西省教育厅专项科研计划项目（15JK1553） |
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| 摘 要： | 为了深入研究气力提升泵的提升性能,该文首先进行了理论分析,建立了适用于不同进气方式的气力提升模型。同时通过改变进气面积与气孔分布方式进行试验研究,试验结果与理论分析结果吻合较好,该模型在一定范围内能够较好地预测提升泵的提升流量;并且根据试验结果,进一步分析了不同进气方式对气力提升泵的液体提升量与提升效率的影响规律。结果表明:首先,7 mm方形喷嘴进气方式下,随着气流量的增加,提升液体流量先较快增加,之后上升趋势逐渐变缓,提升效率先迅速升高,达到峰值后又下降,而沉浸比升高会使峰值效率提高。其次,沉浸比为0.5时,不同进气面积下,较小的进气面积导致提升效率降低;在相同进气面积下,不同的气孔排布方式对提升液体流量与提升效率的影响并不明显。再次,当管内流型接近弹状流型时,提升效率较高,稳定性较好;在环状流下,提升泵的效率最低,稳定性差。
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| 关 键 词： | 泵 模型 试验 气力提升泵 进气方式 |
| 收稿时间： | 2017/4/7 0:00:00 |
| 修稿时间： | 2017/9/18 0:00:00 |
Theoretical model and verification of hydraulic characteristics of air lift pump under different air injection methods |
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| Zuo Juanli,Li Fengchao,Guo Pengcheng,Sun Shuaihui and Luo Xingqi.Theoretical model and verification of hydraulic characteristics of air lift pump under different air injection methods[J].Transactions of the Chinese Society of Agricultural Engineering,2017,33(21):85-91. |
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| Authors: | Zuo Juanli Li Fengchao Guo Pengcheng Sun Shuaihui and Luo Xingqi |
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| Institution: | State Key Labortory Base of Eco-hydraulic Engineering in Arid Area, Xi''an University of Technology, Xi''an 710048, China,State Key Labortory Base of Eco-hydraulic Engineering in Arid Area, Xi''an University of Technology, Xi''an 710048, China,State Key Labortory Base of Eco-hydraulic Engineering in Arid Area, Xi''an University of Technology, Xi''an 710048, China,State Key Labortory Base of Eco-hydraulic Engineering in Arid Area, Xi''an University of Technology, Xi''an 710048, China and State Key Labortory Base of Eco-hydraulic Engineering in Arid Area, Xi''an University of Technology, Xi''an 710048, China |
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| Abstract: | Abstract: Air lift pump is widely applied in oil and ore exploitation, due to its simple structure, high practicability and other prominent advantages. However, the pump is not fully applied because of its low efficiency. To investigate the lift performance of air-lift pump intensively, a theoretical analysis was carried out to and a theoretical model of air-lift for different inlet methods was established in present paper. At the same time, to test the theoretical model and better understand its operating principle, in this paper, the performance of air lift pump was investigated by changing air inlet area and pore distribution pattern in the air lift pump facility. In the experiment, the air, supplied from air compressor, was injected into the riser pipe by nozzle, in order to drive the liquid to move upward in the pipe. Air and water were separated from the gas-liquid separation tank in the top of the riser pipe, and the separated water dropped into the water measuring tank (bucket). In the experimental test, stopwatch recorded the working time of air lift pump, and electronic scale weighed the water from the bucket. The air nozzle selected 3 kinds of injection areas, i.e. 25, 50 and 100 mm2, and for each injection area, 3 injection methods were adopted. Various submergence ratios (0.4-0.9) were investigated, while the range of the air flow rate was from 0 to 16.0 m3/h. For each air injection method and submergence ratio, the air flow rate varied, the corresponding flow rate of water was measured, and the promoting efficiency was calculated. We used high-speed camera to capture the flow regime in the tube to deeply discuss the relationship between air lift capacity and the two-phase flow characteristics. By analyzing the experimental data, the results are obtained as follows: Firstly, for the air injection method of 7 mm square nozzle, with the increase of air flow rate, the fluid flow rate of pump increases quickly, and then rises slowly, and the efficiency of pump goes up rapidly to the peak, and then decreases continuously. With the submergence ratio increasing, the peak of promoting efficiency becomes bigger, and the corresponding air flow rate is smaller. Secondly, for the submergence ratio of 0.5, when the air injection area is 25 mm2, the liquid volume flow rate is significantly higher than other areas of nozzle. For the different air injection areas, the smaller area will cause higher pipeline pressure, which helps to lift liquid but decrease promoting efficiency of pump. For the same air injection area, there is little difference in the pump performance with different pore distribution patterns. Thirdly, in the gas-liquid two-phase flow of riser pipe, we observe 4 kinds of flow patterns, i.e. bubbly, slug, churning, and annular flow. In the bubbly and slug flow, there is little noise in the experiment, but in the churning and annular flow, the noise increases gradually. Near the slug flow, the promoting efficiency reaches the highest point, and the stability is good. In the annular flow, the promoting efficiency reaches the lowest point, and the stability is bad. Finally, the experimental results are compared with the theoretical values, while the experimental results agreed well with the theoretical analysis results in present paper, and the model could predict the liquid flow rate of air-lift pump better in a certain range. Near the slug flow, the theoretical model preferably predicts the performance characteristics of air lift pump, and the calculation results have a good agreement with experimental results. In the other flow patterns, the experimental data and the simulation results have some deviation. The cause is that the theoretical model adopts the slip ration formula of Griffith and Wallis, which is only suitable for the slug flow. In the follow-up work, the theoretical model should be improved. In a word, this study provides an important reference for deeply understanding the performance characteristics of air lift pump. |
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| Keywords: | pumps models experiments air lift pump injection method |
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