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 such as chemical, petrochemical, power, food, and many others. In chemical production, heat exchangers can serve as heaters, coolers, condensers, evaporators, and reboilers, with wide applications.
II. Classified by Heat Transfer Principle
1. Shell-and-tube Heat Exchanger A shell-and-tube heat exchanger involves two fluids of different temperatures flowing in separated spaces between walls. Heat exchange occurs between the fluids through conduction through the walls and convection at the wall surface.
2. Regenerative Heat Exchangers: These exchangers utilize a solid material-based storage unit 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 passes through the solid material to be heated, achieving the goal of heat transfer.
3. Indirect Fluid-to-Fluid Heat Exchanger - This type of heat exchanger connects two surface heat exchangers via a circulating heat carrier. The heat carrier circulates between the high-temperature fluid and the low-temperature fluid, absorbing heat from the high-temperature fluid and releasing it to the low-temperature fluid in the 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-type indirect heat exchange between steam and water and direct mixed flow heat exchange between water. Compared to the surface-type indirect heat exchange between steam and water, it offers higher heat exchange efficiency; compared to direct steam-water mixing heat exchange, it boasts greater stability and lower equipment noise.
III. Categorized by Application
1. A heater is used to heat fluids to the required temperature without causing any phase change in the fluid.
2. Preheaters preheat the fluid, providing standard process parameters for the operation.
3. Superheater - Used to superheat fluids (process gas or steam).
4. Evaporator - Used for heating fluids to temperatures above their boiling points, causing them to evaporate, typically involving a phase change.
Section 4: Categorized by Structure
Available in: Floating Head Heat Exchangers, Fixed Tube Sheet Heat Exchangers, U-Type Tube Sheet Heat Exchangers, Plate Heat Exchangers, etc.
