Shell and Tube Heat Exchangers are one of the most popular types of exchanger due to the flexibility the designer has to allow for a wide range of pressures and temperatures.Shell and tube heat exchanger is a class of heat exchanger designs. It is the most common type of heat exchanger in oil refineries and other large chemical processes, and is suited for higher-pressure applications. As its name implies, this type of heat exchanger consists of a shell (a large pressure vessel) with a bundle of tubes inside it. One fluid runs through the tubes, and another fluid flows over the tubes (through the shell) to transfer heat between the two fluids. The set of tubes is called a tube bundle, and may be composed of several types of tubes: plain tube, longitudinally finned tube, etc.
The shell and tube exchanger consists of four major parts:
Front Header—this is where the fluid enters the tubeside of the exchanger. It is sometimes referred to as the Stationary Header.
Rear Header—this is where the tubeside fluid leaves the exchanger or where it is returned to the front header in exchangers with multiple tubeside passes.
Tube bundle—this comprises of the tubes, tube sheets, baffles and tie rods etc. to hold the bundle together.
Shell—this contains the tube bundle.
Two fluids for heat transfer in a shell heat exchanger, one that flows through the tube, is called the tube path; a flow outside the pipe, whose travel is known as the shell path. The wall of the tube bundle is the heat transfer surface. Different types of tubes, the process is generally the diameter of 16mm, 20mm or 25mm three models, pipe wall thickness is generally 1mm, 1.5mm, 2mm and 2.5mm. The inlet heat exchanger has a minimum diameter of 8mm and a wall thickness of only 0.6mm. Greatly improved the heat exchange efficiency, in 2012 has also gradually promoted in the domestic market. The tube bundle design of the shell and tube heat exchanger can maximize the turbulence effect and increase the heat exchange efficiency. The asymmetric design of the inner shell and the tube layer can be up to 4.6 times. This asymmetry design determines its wide application in the field of steam water heat exchange. The maximum heat transfer efficiency can reach 14000w/m2.k, greatly improving the production efficiency and saving the cost.
At the same time, because of shell and tube heat exchanger for metal structure, with the launch of the new version of Chinese GMP, 316L stainless steel heat exchanger will become the beverage, food, and pharmaceutical industry required.