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The transition from froth to spray regime on sieve trays was experimentally studied in an air/water simulator with 300 mm diameter. It has been found that the regime transition occurs as the cleax liquid height is equal to the residual pressure drop on the trays. A convenient and accurate technique was proposed for determination of the regime transition point. ]Based on analysis of the transition process at a sieve hole, a new formula which can be used to correlate the experimental results was provided. 相似文献
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Size distribution of droplets above a rotating stream tray and model of droplet motion therein 总被引:1,自引:0,他引:1
Droplet size distributions have been investigated with a two-probe system above a rotatingstream tray of 300 mm diameter.The measured distributions are found to follow the upper limitedlognormal distribution with three parameters dependent primarily on gas hole F-factor.A probabilitymethod is used to describe the initial state of the droplet population above the tray,and a model fordroplet motion is presented.The results computed with model agree well with experimental data. 相似文献
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在厌氧条件下,对利用生物转鼓过滤器(Rotating Drum Biofilter,简称RDB)反硝化净化一氧化氮(NO)废气的过程进行了理论模型探讨,并用实验结果进行了验证.在分析NO在RDB内的传质-反应过程基础上,建立了滤料微单元内NO在气相、液相内的质量守恒方程,结合生物膜内NO的传质方程和厌氧条件下的Monod微生物反应动力学方程,最终得到了NO在RDB中的浓度分布方程及NO去除效率方程.模型计算值与实验结果比较表明,两者去除效率的变化趋势互为一致,模型能够较好地描述RDB对低浓度(<600 mg·m-3)NO的去除过程,但因模型未考虑RDB内营养液对NO的吸收作用等因素,模型计算值比实验结果约低10%. 相似文献
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挥发性有机化合物(VOCs)是臭氧、二次有机气溶胶生成潜势较高的气态污染物,这类污染物的有效控制是大气复合型污染防治的关键。微生物燃料电池(MFC)技术净化VOCs不仅具有传统生物法绿色、安全、碳排放量低的特点,还能够将污染物中化学能回收为电能,近年来受到广泛关注。结合MFC净化VOCs基本原理,概述了MFC中相际传质、降解反应过程强化的研究思路及进展,介绍了空气电极、光催化技术在新型MFC中的应用。另外,针对产电功率密度及库仑效率受限的瓶颈,对MFC净化VOCs的研究进行了展望,提出改善“微生物-电极”界面电子传递、调控降解菌及产电菌协作关系等重要研究方向。 相似文献