Product Details
I. Definition
Heat exchangers, also known as heat exchangers, are devices that transfer a portion of the heat from a hot fluid to a cold fluid. They play a crucial role in various industrial processes, including chemical, petrochemical, power, food, and many others. In chemical production, heat exchangers can function as heaters, coolers, condensers, evaporators, and reboilers, with wide applications.
II. Classified by Heat Transfer Principle
1. Shell-and-tube Heat Exchangers - Shell-and-tube heat exchangers involve two fluids of different temperatures flowing in separated spaces between the walls. Heat transfer occurs between the fluids through the wall's thermal conductivity and convection at the wall surface.
2. Regenerative Heat Exchangers: These heat exchangers utilize a solid heat storage medium to transfer heat from a high-temperature fluid to a low-temperature fluid. The heat medium first heats the solid material to a certain temperature, and then the cold medium is heated through the solid material, achieving the goal of heat transfer.
3. Indirect Fluid Connect Heat Exchanger - An indirect fluid connect heat exchanger connects two surface heat exchangers via a circulating heat carrier. The heat carrier circulates between the high-temperature fluid heat exchanger and the low-temperature fluid, absorbing heat from the high-temperature fluid and releasing it to the low-temperature fluid in the low-temperature heat exchanger.
4. Direct-contact heat exchangers, also known as mixed heat exchangers, are equipment where two fluids come into direct contact and mix for heat exchange, such as in cooling towers, gas condensers, etc.
5. A double-effect heat exchanger that combines both surface-to-vapor indirect heat exchange and direct water-to-water mixed flow heat exchange. Compared to surface-to-vapor indirect heat exchange, it offers higher heat exchange efficiency; compared to direct water-to-vapor mixed heat exchange, it has greater stability and lower equipment noise.
III. Categorized by Application
1. A heater is used to heat fluids to the required temperature without causing a phase change in the heated fluid.
2. The preheater preheats the fluid, providing standard process parameters for the operation.
3. Superheater - Used to superheat fluids (process gas or steam) to a superheated state.
4. Evaporator - Used to heat fluids to temperatures above their boiling point, causing the fluid to evaporate, typically involving a phase change.
Section 4: Categorized by Structure
It can be divided into: floating head heat exchangers, fixed tube sheet heat exchangers, U-tube shell and tube heat exchangers, plate heat exchangers, etc.
