Our company held the EDV Appraisal on Jan. 21, 2002, which was an appraisal for the research and application results of the high efficient EDV tray with experts from Beijing Science and Technology Commission, lead by Prof. and Senior Engineer Xu Chengne, including Prof. and Senior Engineer Mao Shumei, Prof. and Senior Engineer Wang Songhan as Group Deputy and Chen Wenzao, Fei Weiyang, Huang Jie, Chen Jun, Hao Xiren, Qi Hongxiang as Group Members. According to those experts: "The EDV tray was developed to be based on the defects of conventional tray and the advanced experiences home and abroad. The major advantage of EDV is that output of tower after the integrated optimistic design in the actual operation situation can be 40% more than the current F1 tray, 10% more in separation efficiency 30%-50% more in operation flexibility, 10% less in pressure drop. The general specifications have reached the advanced world level."