气力提升理论模型建立及验证  

Modeling and Validation of an Airlift Lifting System

作　　者：胡东[1,2] 王晓川[1] 唐川林[2] 康勇[1] HU Dong WANG Xiao-chuan TANG Chuan-lin KANG Yong(Key Laboratory of Hubei Province for Water Jet Theory ＆ New Technology, School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China Modem Jetting Department, Hunan University of Technology, Zhuzhou 412007, China)

机构地区：[1]武汉大学水射流理论与新技术湖北省重点实验室,武汉大学动力与机械学院,湖北武汉430072 [2]湖南工业大学水射流研究所,湖南株洲412007

出　　处：《高校化学工程学报》2016年第5期1074-1081,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金项目(51374101);国家自然科学基金项目(51474158);国家重点基础研究发展计划(2014CB239203)

摘　　要：气力提升技术已成功应用于深井取水、石油开采及危险介质输送等领域,其系统常规特性已得到较为深入的分析,然而针对于此的理论模型研究却涉猎较少。基于动量定理,并结合压强梯度损失模型建立适用于液体输送的气力提升理论模型,从而数值计算得出液体表观速度随系统结构及运行参数的变化规律,并通过对小型气力提升系统的实验结果分析验证理论模型的可靠性。结果表明,存在一最佳气体表观速度使得液体表观速度达到最高,且峰值位置随浸入深度升高向低气体表观速度偏移。液体表观速度随管径增加在跨过其临界点之后亦出现先升后降之趋势,峰值点随气体体积流量增加表现出右移特征。在临界浸入深度之上,液体表观速度随其升高而上扬,且随气体流量降低曲线凹凸程度显著增加。此外,进气口位置下移有助于气力提升性能的增强。在临界实测结果与计算值吻合度较高,为气力提升系统的设计提供了理论依据。Airlift technology has been widely applied in areas of deeper water intaking, petroleum drilling anddangerous medium conveying. Conventional characterization has been deeply investigated, but studies ontheoretical models are insufficient. A frictional pressure drop model together with a numerical model of airliftbased on momentum theorem were combined to study water conveying to optimize geometrical and operationalparameters of the airlift system. Furthermore, a small airlift system was set up for the verification of thetheoretical model. The calculated results indicate that water superficial velocity increases with the volumetricflux of the injected air to a maximum value and then slightly decreases. The maximum value moves left with theincrease of submerged length. The relation between water superficial velocity and pipe diameter also shows asimilar trend when the pipe diameter exceeds a critical limit, and the maximum value moves right with theincrease of air flow rate. The water superficial velocity increases with submerged length when the lengthexceeds a critical value, at which the curvature increases with the increase of air flow rate. In addition, the airliftperformance can be enhanced by moving the air inlet downwards. The experimental results show goodagreement with the proposed model, which provides theoretical support for developing airlift systems.

关 键 词：气力提升 动量定理 管径 浸入深度 进气口 

分 类 号：TP69[自动化与计算机技术—控制理论与控制工程]