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Classification of heat exchangers

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

Classification by heat transfer principle

Interwall heat exchangers are two kinds of fluids with different temperatures flowing in a space separated by the wall surface. Heat transfer is carried out between two kinds of fluids through the heat conduction of the wall surface and the convection of the fluid on the wall surface. Interwall heat exchangers include shell and tube heat exchangers and other types of heat exchangers. Interwall heat exchanger is the most widely used heat exchanger at present.

The heat storage heat exchanger transfers the heat from the high-temperature fluid to the low-temperature fluid through the heat storage body composed of solid materials. The hot medium first heats the solid material to a certain temperature, and then the cold medium is heated through the solid material to achieve the purpose of heat transfer. Regenerative heat exchanger has rotary, valve switching type, etc.

3, fluid connection indirect connection indirect heat exchanger, heat exchanger fluid is to put the two surface heat exchanger are linked by the heat carrier in circulation of heat exchanger, heat exchangers and low temperature heat carrier in the high temperature fluid between the fluid circulation, accept the quantity of heat, high temperature fluid in low temperature fluid heat exchanger to heat fluids at low temperature.

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

5. Double heat exchanger is equipped with two heat transfer modes, namely, indirect heat transfer of soda surface type and direct mixed flow heat transfer of water. Compared with the indirect heat transfer of soda surface, it has higher heat transfer efficiency. It has higher stability and lower unit noise than the direct mixing heat exchange of soda water.

Ii. Classification by purpose

The heater heats the fluid to the necessary temperature, but no phase change occurs in the heated fluid.

2. Preheater the preheater preheats the fluid to provide standard process parameters for process operation.

Superheater superheater is used to heat the fluid (process gas or steam) to superheat state.

Evaporator evaporator is used to heat the fluid to the temperature above the boiling point, so that the fluid evaporates, generally with phase changes.

Classification by structure

It can be divided into: floating head heat exchanger, fixed tube-plate heat exchanger, u-tube-plate heat exchanger, plate heat exchanger and so on.

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