The upper tower pressure of the two-stage distillation tower of small air separation unit  

The oxygen enriched liquid air passes through the oxygen enriched liquid air channel through the chiller and then throttles to the upper tower for further distillation, the nitrogen at the top of the lower tower of liquid air separation plant passes through the nitrogen channel to the condensing evaporator for condensation into liquid nitrogen. A portion of the liquid nitrogen is passed through the liquid nitrogen pipeline as reflux to the lower column, while the other portion is sub-cooled by t...

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