摘要
针对曝气池中的实际充氧情况,提出新的曝气性能指标—充氧均匀性指数,并提出一种新型曝气器旋转曝气器。在长宽高尺寸为600 mm×800 mm×910 mm的有机玻璃曝气池内,以空气-清水为体系,对旋转曝气器的曝气充氧性能进行了研究。主要考察了充氧均匀性指数、氧总传质系数和曝气效率等曝气充氧性能,并与微孔曝气器进行对比。实验结果表明,当曝气流量为1.0~2.5 m^3/h,旋转曝气器和微孔曝气器的氧总传质系数、氧传质速率、氧传质效率和曝气效率很相近;旋转曝气器的充氧均匀性指数介于0.040 4~0.049 4,而微孔曝气器的充氧均匀性指数介于0.054 7~0.127 5。旋转曝气器产生的旋转流场能使气泡在水平面分布更均匀,提高了氧传质效果。
Based on the actual situation oxygenation in the aeration tank, a novel rotary bubble diffuser and a novel aeration performance index-oxygenation uniformity index are both proposed. The aeration performances of the rotary bubble diffuser are experimentally studied by using an air-water system in a glass reinforced fiber aeration tank with a size of 600× 800× 910 mm. The oxygenation uniformity index, oxygen transfer coefficient and aeration efficiency of the rotary bubble diffuser are analyzed and compared with those of a fine bubble diffuser.The results show that the oxygen transfer coefficient, oxygen transfer rate, oxygen transfer efficiency and aeration efficiency of rotary bubble diffuser are very close to those of fine bubble diffuser under an air flow rate of 1.0 to 2. 5 m^3/h.The oxygenation uniformity index of the rotary bubble diffuser varies from 0. 040 4 to 0. 049 4, while that of the fine bubble diffuser varies from 0. 054 7 to 0. 127 5. The rotary flow field generated by the rotary bubble diffuser makes the bubble more evenly distribute in horizontal scale, which improves the oxygen transfer.
出处
《现代化工》
CAS
CSCD
北大核心
2017年第6期161-165,共5页
Modern Chemical Industry
基金
浙江省科技计划项目公益技术研究工业项目(2012C21019)
关键词
旋转曝气器
微孔曝气器
充氧均匀性指数
旋转流场
rotary bubble diffuser
fine bubble diffuser
oxygenation uniformity index
rotary flow field
