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Tube and tube cooler, also known as shell and tube heat exchanger. It is a partition type heat exchanger with the wall of the tube bundle enclosed in the shell as the heat transfer surface. This type of heat exchanger has a simple structure, reliable operation, and can be made of various structural materials (mainly metal materials such as stainless steel, carbon steel, etc.). It can be used under high temperature and high pressure, and is currently the most widely used type.
1) The required heat transfer area is determined by the known flow rates of cold and hot fluids, initial and final temperatures, and the specific heat capacity of the fluid. Preliminary estimation of heat transfer area generally involves assuming the heat transfer coefficient, determining the structure of the heat exchanger, and then verifying the heat transfer coefficient K value.
2) When selecting a heat exchanger, attention should be paid to the pressure rating, operating temperature, and connection conditions of the interface. Under the premise of pressure drop and installation conditions, it is beneficial to choose an elongated type with a smaller diameter for shell and tube heat exchangers to improve heat transfer.
3) The pressure drop of the heat exchanger should not be too large, generally controlled between 0.1 and 1.25 MPa;
4) The flow velocity should consider the viscosity of the fluid, and the flow velocity with high viscosity should be less than 0.5-1.0m/s; The flow velocity inside a general fluid pipe should be taken as 0.4-1.0m/s; The fluid that is prone to scaling should be taken at a speed of 0.8-1.2m/s.
5) A filter should be installed before high-temperature water enters the heat exchanger.
6) The combination of individual processing and configuration of heat exchangers in a heat exchange station should meet the requirements of the total heating load and regulation of the heat exchange station. On the premise of meeting the user's heat load regulation requirements, the number of heat exchangers in the same heating coefficient should not be less than 2 and not more than 5.
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