Product Details
I. Definition
Heat exchangers, also known as heat exchangers, are devices that transfer a portion of heat from a hot fluid to a cold fluid. They play a crucial role in chemical, petrochemical, power, food, and many other industrial production processes. 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 exchangers are designed for heat exchange between two fluids of different temperatures, which flow in separate spaces separated by walls. Heat transfer occurs through the wall's conduction and the convection of the fluids 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 Exchangers - These heat exchangers connect 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.
4. Direct-contact heat exchangers, also known as mixed-flow heat exchangers, are equipment where two fluids come into direct contact and mix for heat exchange. Examples include cooling towers, gas condensers, etc.
5. A dual heat exchanger that combines both water-to-water surface indirect heat exchange and water-to-vapor surface indirect heat exchange methods. Compared to water-to-vapor surface indirect heat exchange, it offers higher heat exchange efficiency; compared to water-to-vapor direct mixing heat exchange, it has higher stability and lower equipment noise.
III. Categorized by Usage
1. Heater: A heater is used to raise 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 standardized 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 points, causing the fluid to evaporate, typically 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.
