Abstract: An evaluating method of gas velocity distributions along the tray deck is reliably formulated in this paper that derived from sum model of the pressure drop combined with pressure balance on trays. In order to validate the formula, a case study is presented to illustrate the method. The experiment program was carried out in the 6400 mm×800 mm rectangular simulators with air/water system in which two-pass valve trays were divided uniformly into 16 zones（8 zones in every pass）. Pressure drops (dry and total) and liquid hold-up in every zone along tray decks were measured. The model can well characterize and predict the local gas rate distribution in each zone along tray decks on large scale trays within reliably accuracy based on the experiments data of pressure drop and liquid holdup.

Key words: sum model of pressure drop, valve tray, gas distribution, liquid holdup distribution

摘要： 针对目前缺乏有效的大型塔板气速分布测试方法的现状，利用塔板压降的加和模型和塔板压力平衡，推导出沿塔板液流方向上不同区域的局部气速模型。在6400 mm×800 mm大型双溢流、16分区空气/水冷模试验塔上对所推导出的公式进行验证。结果表明，该模型依据塔板压降和持液分布数据能够对塔板上的气相分布进行很好的表征和量化。

关键词: 压降加和模型；浮阀塔板；气相分布, 持液分布