欧美精品色精品一区二区三区,欧美精品香蕉在线观看网,怡红院在线影院,日本视频免费观看,美女视频午夜,3d动漫美女吹潮视频,强美女视频

Heat exchange reactors are also called non-adiabatic variable temperature reactors, and their structure is mostly similar to shell and tube heat exchangers. The catalyst can be placed in the tube or between the tubes, but the latter is less common. The gas of the heat exchange fixed-bed reactor flows down into the catalyst bed from the top of the reactor and flows out at the bottom. In actual production, most of them use a top-down flow method.