Product Details
I. Definition
Heat exchangers, also known as heat exchangers, are devices that transfer part of the heat from a hot fluid to a cold fluid. They play a crucial role in many industrial processes, including chemical, petrochemical, power, food, and numerous others. In chemical production, heat exchangers can serve as heaters, coolers, condensers, evaporators, and reboilers, with wide applications.
II. Classified by Heat Transfer Principle
Shell-and-tube heat exchangers allow two fluids of different temperatures to flow in separated spaces on either side of a wall. Heat transfer occurs between the fluids through the wall's conduction and convection at the wall surface.
2. Regenerative Heat Exchangers - These utilize a solid 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 purpose of heat transfer.
3. Indirect Fluid-to-Fluid Heat Exchanger - This is a heat exchanger that connects two surface-type heat exchangers via a heat carrier circulating within them. 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-flow heat exchangers, are devices where two fluids come into direct contact and mix for heat exchange. Examples include cooling towers and gas condensers.
5. A double-effect heat exchanger that combines both surface-to-surface indirect heat exchange and direct water-to-water mixing heat exchange. Compared to surface-to-surface indirect heat exchange, it offers higher heat exchange efficiency; compared to direct water-to-water mixing heat exchange, it boasts greater stability and lower equipment noise.
Section 3: Categorized by Usage
1. Heater: A heater raises the temperature of a fluid to the necessary level 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 heat fluids (process gas or steam) to a superheated state.
4. Evaporator - An evaporator is used to heat a fluid to temperatures above its boiling point, causing the fluid to evaporate, typically involving a phase change.
Section 4: Categorized by Structure
Available in: Floating Head Heat Exchangers, Fixed Tube Sheet Heat Exchangers, U-Tube Sheet Heat Exchangers, Plate Heat Exchangers, etc.
