Temporary stop operation of air separation unit

Shell and tube air separation heat exchanger is the most representative wall heat exchanger. It has a long history of application and is still dominant in all heat exchangers. Shell and tube heat exchanger is mainly composed of shell, tube bundle, tube sheet and head. Most of the shell is round, and there are parallel tube bundles inside. Both ends of the tube bundle are fixed on the tube plate. In shell and tube heat exchanger, there are two kinds of fluids for heat exchange. One kind of fluid flows in the tube, and its stroke is called tube side. The other flows outside the tube and its stroke is called shell side. The wall of tube bundle is the heat transfer surface. In order to improve the heat transfer coefficient of the fluid outside the tube, a certain number of transverse baffles are usually installed in the shell. The baffle can not only prevent the short circuit of the fluid and increase the velocity of the fluid, but also force the fluid to flow through the tube bundle man

1.The cold box foundation is divided into frame type and non frame type. The levelness of top surface of frame type frame shall not exceed 1 / 1000. All sections of the frame shall be placed vertically. All bottom plates of non frame type cold box shall be kept at the same level, and the levelness shall not exceed 1 / 1000.   2.When installing the cold box plate, the adjacent two sides can beassembled into a whole piece or angle type on the ground. The length error of each diagonal line a...