喷射气举提升性能实验分析

Experimental research on lifting capability of jet air-lift

由于传统气举提升效率较低,笔者设计出环形射流泵结构的喷射气举,建立了一套气举提升实验装置,选用精筛选的河沙作为提升对象,实验研究了进气量、浸入率等因素对喷射气举扬水量、扬固量的影响规律,对提升管内的流动形态进行了分析,并对传统气举和喷射气举的扬固能力进行对比;运用能量守恒定律建立了气举效率模型,对喷射气举和传统气举的扬固效率进行对比分析。结果表明:存在最优进气量,使喷射气举的扬固量和扬水量最高,浸入率越大,喷射气举的扬固量和扬水量越高,提升管内流动形态为团状流时能有效提升固液混合物;喷射气举扬固效率高于传统气举,在高进气量和低浸入率条件下尤为明显。

The lifting efficiency of traditional air-lift system is low,therefore a jet air-lift of annular jet pump structure is designed in this article,and an experimental device of air-lift system is established.In the experiment,riversand is chosen as the lifting object,and the influence laws of jet air-lift lifting water and solid capacity by air flow rate on submergence ration are researched.The flow pattern inside the riser is analyzed,and the lifting solid capacity of traditional air-lift and jet air-lift is compared.The efficiency model of air-lift is established by energy conservation law,and the lifting solid efficiency of traditional air-lift and jet air-lift is compared.The result show that there is a best air flow rate making the highest of water and solid flow rate.The water and solid flow rate increase as the submergence ration increases,and the system can lift water and solid effectively when the flow pattern is churn flow.The lifting solid efficiency of jet airlift is higher than that of traditional one,especially in the condition of high air flow rate and low submergence ration.