Shell And Tube Heat Exchanger Introduction

Shell and tube heat exchanger, also known as tube heat exchanger. 

It is closed in the shell of the wall of the tube bundle as the heat transfer surface of the wall type heat exchanger. This heat exchanger structure is simple, low cost, wide circulation cross-section, easy to clean the scale; but the heat transfer coefficient is low, covers a large area. 

Available in a variety of structural materials (mainly metal materials) manufacturing, can be used at high temperatures, high pressure, is the most widely used type.

Shell and tube heat exchanger consists of shell, heat transfer tube bundle, tube plate, folding plate (baffle) and tube box and other components. The shell is mostly cylindrical, with tube bundles inside, and the ends of the tube bundles are fixed on the tube plate. Heat transfer of cold and hot two kinds of fluids, one in the tube flow, known as the tube course fluid; the other in the tube outside the flow, known as the shell course fluid. In order to improve the heat transfer coefficient of the fluid outside the tube, usually installed in the shell of a number of baffles. Baffle can increase the shell process fluid velocity, forcing the fluid to travel several times according to the specified lateral through the tube bundle, enhance the degree of fluid turbulence. Heat exchanger tubes in the tube plate can be arranged according to the equilateral triangle or square. Equilateral triangle arrangement is more compact, high degree of fluid turbulence outside the tube, heat transfer coefficient; square arrangement is easy to clean outside the tube, suitable for easy scaling of the fluid.

Shell and tube heat exchanger has a fixed tube and plate steam - water heat exchanger, with expansion joints shell and tube steam - water heat exchanger, floating head steam - water heat exchanger, U-shaped shell and tube steam - water heat exchanger, wave section type shell and tube steam - water heat exchanger, water - water heat exchanger and other types of segments. The main control parameters of shell and tube heat exchanger are heating area, hot water flow rate, heat exchange capacity, heat medium parameters and so on.