Classification of heat exchangers

It is suitable for heat exchangers with different media, different working conditions, different temperatures, different pressures, and different structural types. The specific classification of heat exchangers is as follows:

First, according to the principle of heat transfer classification

1, the wall heat exchanger between the wall heat exchanger is two fluids with different temperatures flowing in the space separated by the wall, through the heat conduction of the wall and the fluid convection on the wall surface, heat transfer between the two fluids. Wall heat exchangers are tube shell type, tube type and other types of heat exchangers. The wall heat exchanger is the most widely used heat exchanger at present.

2, regenerative heat exchanger Regenerative heat exchanger through the solid material composed of heat storage body, the heat transfer from the high temperature fluid to the low temperature fluid, the hot medium first by heating the solid material to reach a certain temperature, the cold medium is heated through the solid material, so as to achieve the purpose of heat transfer. Regenerative heat exchanger has rotary type, valve switching type and so on.

3, fluid connection indirect heat exchanger Fluid connection indirect heat exchanger, is the two surface heat exchanger by circulating heat carrier connected heat exchanger, heat carrier in the high-temperature fluid heat exchanger and low-temperature fluid circulation, in the high-temperature fluid to accept heat, in the low-temperature fluid heat exchanger to release heat to the low-temperature fluid.

4, the direct contact heat exchanger is also known as the hybrid heat exchanger, this heat exchanger is two kinds of fluid direct contact, mixed with each other for heat exchange equipment, such as cold water tower, gas condenser, etc.

5, the compound heat exchanger has two kinds of heat exchange equipment, namely, the indirect heat exchange of water surface type and the direct mixed flow heat exchange of water and water. It has higher heat transfer efficiency than the indirect heat transfer of soda noodles. It has higher stability and lower unit noise compared with the direct mixing of steam and water.

2. Classification by use

1, heater heater is to heat the fluid to the necessary temperature, but there is no phase change in the heating fluid.

2, preheater Preheater heats the fluid in advance to provide standard process parameters for process operation.

3, superheater Superheater is used to heat the fluid (process gas or steam) to a superheated state.

4, evaporator evaporator is used to heat the fluid, to reach a temperature above the boiling point, so that the fluid evaporates, generally there is a phase change.

3. Classification by structure

It can be divided into: floating head heat exchanger, fixed tube-plate heat exchanger, U-shaped tube-plate heat exchanger, plate heat exchanger, etc.