Abstract: With the aquaculture industry becoming more intensive and industrialized, it is in urgent need to study energy-saving aeration technologies and develop new aeration devices with high performance thus to achieve high efficiency of oxygen dissolving, CO2 stripping and fluidization improving. Based on the double film theory of air and water two-phase dissolution and Venturi tube principle, a new tube aeration device was designed and developed. The key technological parameters affecting aeration performance were studied and elaborated, based on which the device structure was optimized to develop new-type energy-saving technology for fishery aeration and oxygenation. This study showed that the aeration efficiency was the influenced by such key structure parameters as height above water level (Hw), diameter shrinkage (D1/D2), air inlet size and air flow rate. Within certain limits, the aeration and oxygenation efficiency was higher if the Hw, diameter shrinkage, air inlet size and air flow volume were also higher or larger. However, the additional increase of the prolonging and spiral mixing structures pushed up head loss, brought down air flow rate and thus reduced the aeration and oxygenation efficiency. This new tube aeration device utilizes extra flow dynamics to realize water oxygenation, providing a novel oxygenation method in aquaculture with the merits of high-efficiency, energy-saving, simple operation and economic production.

Key words: new tube aeration device, aeration efficiency, energy-saving oxygenation

摘要： 随着水产养殖业逐渐向高密度、集约化方向的发展，为实现氧气高效溶解、CO2调控、流态改善等目的，急需研制新型高效曝气装置，开发高效节能的曝气技术。基于气水两相溶解的双膜理论和文丘里原理，设计开发了一种管式曝气装置，经初步试验获得了影响增氧性能的关键技术参数，并以此为基础对曝气装置进行优化设计，研究新型节能增氧技术。试验结果表明，管式曝气装置中影响曝气效果的因素有水面高程（Hw）、缩径（D1/D2）、旋混结构、进气口大小、进气量等。水面高程、缩径、进气口越大，进气量越充足，曝气装置的增氧效果越高；而额外增加延长结构和旋混结构后曝气装置水头损失增大、进气量下降，从而导致增氧效果显著下降。该装置利用额外水流动力实现增氧，是一种高效、节能、经济的新型曝气装置，可为水产养殖提供一种新的增氧方法。

关键词: 管式曝气装置, 曝气效率, 节能增氧