翻译 感谢！？ it's necessary to use liquid-gas mass transfer equipment in many operating units in the field of the chemical and oil industry, such as absorption unit, desorption unit, distillation unit, extraction unit, and so on. column is one of the liquid-gas mass transfer equipments where the heat and mass transfer between iiquid and gas phases are achieved by close contaction of two phases. generally speaking, there are two kinds of columns, inter-level-contacting and contacting ones. the former is the representative of tray column, and the later is of packed column that is packed a certain degree of filler layer by some filler. the layers are washed by downflowed liquid and upflowed gas. both phases of the liquid and the gas meet to each other on the surface of the filler to finish the heat and mass transfer.the meeting in packed column is not as interupting as in the tray one, and therefore the liquid-gas composition varies on the continous style. otherwise, the packed column is suitable for conrrosion-resistant material,for its simple constructure and small resistance. the packed column was used to small and medium-size devices and laboratary equipment in the past, but recently the packed columns, espcially those with couple- and dozen-meter diameter, are widely applied in the industry, for the reason of fast research of new filler, development of distribution in the column and genaration of new efficient filler. [ ]查看更多
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