Design and oxygenation experiment of a new tube aeration device
SONG Benben, SHAN Jianjun, WU Fan
（Key Laboratory of fishery Equipment and Engineering, Ministry of Agriculture,
Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200092, China）
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