Abstract:

Dissolved air equipment is an important part of dissolved air release microbubble generation system. Based on the self-designed and developed jet-enhanced non-packed dissolved air equipment, this paper carried out experimental research on its working performance under different operating parameters. The WTW dissolved oxygen measurement equipment was used to measure the on-line pressure of the whole process, and the dissolved air performance was directly characterized by the change rate of dissolved oxygen concentration in water. The experimental results showed that the new dissolved air equipment still had high dissolved air performance under low energy consumption. The dissolved air performance increased with the increase of gas liquid ratio. The dissolved gas efficiency decreased with the increase of dissolved gas pressure, and increased first and then decreased with the increase of inlet water flow rate. The oxygen transfer mass transfer coefficient increased with the increase of dissolved gas pressure and inlet water flow rate. The optimal inlet flow rate range was between 0.7m³/h and 0.9m³/h. Because the new dissolved air equipment can still produce high-quality fine bubbles when using ordinary ball valves to reduce pressure and release gas to form bubbles, it occupied a smaller area than traditional equipment and was not easy to block, so it had more advantages in practical engineering applications.

Key words: dissolving air equipment, jet intensification, dissolved air performance, dissolved oxygen concentration, gas-liquid flow, multiphase reaction

摘要：

溶气设备是溶气释放式微细气泡发生系统的重要组成部分，基于自主设计研发的射流强化非填料式溶气设备，对其在不同操作参数下的工作性能开展了实验研究。采用WTW手持式溶解氧测定仪实施全程在线带压测量，同时以空气在水中溶解氧浓度的变化率直接表征溶气性能。结果表明，新型溶气设备在低能耗下仍具有较高的溶气性能；溶气性能随气液比的增加而增加，溶气效率随着溶气压力的增加而降低，随着进水流量的增加呈现出先增加后减小的趋势，氧转移传质系数随溶气压力和进水流量的增加而增加，最佳进水流量区间为0.7~0.9m³/h。由于新型溶气设备在使用普通球阀减压释气成泡时，仍能产生高质量的微细气泡，占地面积远小于传统设备且不易堵塞，因此在实际工程应用中更具优势。

关键词: 溶气设备, 射流强化, 溶气性能, 溶解氧浓度, 气液两相流, 多相反应