Product Details
I. Definition
Heat exchanger, also known as a heat exchanger, is a device that transfers a portion of the heat from a hot fluid to a cold fluid. It plays a crucial role in various industrial processes such as chemical, petrochemical, power, food, and many others. In chemical production, heat exchangers can act as heaters, coolers, condensers, evaporators, and reboilers, with extensive applications.
II. Classified by Heat Transfer Principle
1. Shell-and-tube heat exchangers operate by allowing two fluids of different temperatures to flow in separated spaces between walls. Heat transfer occurs through the wall's thermal conductivity and convection at the fluid's surface.
2. Regenerative Heat Exchangers - These utilize a regenerative heat storage medium made of solid material 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 Connection 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 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, gas condensers, and more.
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.
III. Categorized by Application
1. Heater: A heater raises the temperature of a fluid to the necessary level without causing a phase change in the fluid.
2. The preheater preheats the fluid, providing standard process parameters for the operation.
3. Superheater - A superheater is used to heat the fluid (process gas or steam) to a superheated state.
4. Evaporators are used to heat fluids to temperatures above their boiling point, causing the fluid to evaporate, usually involving a phase change.
IV. Categorized by Structure
Available in: Floating Head Heat Exchangers, Fixed Tube Sheet Heat Exchangers, U-Tube Sheet Heat Exchangers, Plate Heat Exchangers, etc.
