It is suitable for heat exchangers with different media, different working conditions, different temperatures and different pressures, with different structural types. The specific classification of heat exchangers is as follows:
Classified by heat transfer principle
1. Dividing wall heat exchanger Dividing wall heat exchangers are two fluids with different temperatures flowing in the space separated by the wall, through the wall heat conduction and the fluid convection on the wall surface, heat exchange between the two fluids. Partition wall heat exchangers include shell-and-tube type, double-pipe type and other types of heat exchangers. The partition wall heat exchanger is the most widely used heat exchanger. 2. Regenerative heat exchanger The regenerative heat exchanger transfers heat from a high-temperature fluid to a low-temperature fluid through a heat storage body composed of solid materials. After the heating medium reaches a certain temperature by heating the solid material, the cold medium passes through the solid material. The substance is heated to achieve the purpose of heat transfer. Regenerative heat exchangers include rotary type and valve switching type. 3. Fluid-connected indirect heat exchanger. Fluid-connected indirect heat exchanger is a heat exchanger that connects two surface heat exchangers by a heat carrier circulating in it. The heat carrier is in the high temperature fluid heat exchanger and the low temperature fluid heat exchanger. Circulate between fluids, receive heat in the high-temperature fluid, and release the heat to the low-temperature fluid in the low-temperature fluid heat exchanger. 4. Direct contact heat exchangers are also called hybrid heat exchangers. This type of heat exchanger is equipment where two fluids are in direct contact and mix with each other for heat exchange, such as cold water towers, gas condensers, etc. 5. The compound heat exchanger has both steam-water surface indirect heat exchange and water-water direct mixed flow heat exchange equipment. Compared with steam-water surface indirect heat exchange, it has higher heat exchange efficiency; compared with steam-water direct mixing heat exchange, it has higher stability and lower unit noise.
Classified by purpose
1. Heater The heater heats the fluid to the necessary temperature, but the heated fluid has no phase change.
2. Preheater The preheater preheats the fluid to provide standard process parameters for process operations.
3. Superheater The superheater is used to heat the fluid (process gas or steam) to a superheated state.
4. Evaporator The evaporator is used to heat the fluid to a temperature above the boiling point to evaporate the fluid, generally with a phase change.
