鼓风曝气空气量计算方法的改进  

Improvement of Calculation Method for Gas Demand

作　　者：汤利华[1,2] 孟广耀[1] 

机构地区：[1]中国科学技术大学材料与化学学院,安徽合肥230026 [2]安徽建筑工业学院环境工程学院,安徽合肥230022

出　　处：《沈阳建筑大学学报（自然科学版）》2008年第6期1051-1054,共4页Journal of Shenyang Jianzhu University：Natural Science

基　　金：安徽省十五科技攻关项目(01013024)

摘　　要：目的针对目前鼓风曝气空气量计算方法存在的问题,改进计算方法,使得计算结果更好地反映曝气实际过程.方法基于气体状态方程和双膜理论,分析水深对气体体积和表面积的影响,气泡在曝气池中的停留时间对曝气量的影响,并通过实验,分析相关参数的确定方法,通过计算实例,对改进前后的计算结果进行了比较.结果充分修正了氧总转移系数KLa,改进后空气量的计算公式包含了气泡在曝气池中的停留时间,使曝气量与曝气池的曝气过程有了联系,并给出了相关参数的确定方法.结论改进曝气量计算的过程,对提高曝气效率,节省曝气能耗有一定的意义.The method of calculation of gas demand of blast aeration is discussed to solve problems in calculating the gas demand of blast aeration, so that the calculated result can accord better with factual aeration process. Problems in calculating the gas demand of blast aeration were analyzed. The influence of water depth on gas volume and gas specific surface area and the influence of retention time of bubble on gas demand was also analyzed on the basis of the gas formula and the two-film theory. According to the data from the aeration experiment and some documents, the methods of acquiring values of related factors were discussed. The comparison of calculated results was made with an example. As a result, volumetric oxygen transfer coefficient （KLa） was well amended. Retention time of bubble in aeration pool is included in the improved calculation formula of gas demand, and the calculation of gas demand is related to aeration process. The methods of acquiring values of related factors were presented. The conclusion is that improvement of calculation of gas demand is significant to enhancement of aeration efficiency and reduction of consumption of energy in aeration.

关 键 词：鼓风曝气 曝气量 气泡停留时间 氧传质系数 

分 类 号：X505[环境科学与工程—环境工程]