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 chemicals, oil, 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 exchangers operate by allowing two fluids of different temperatures to flow in separated spaces between the walls. Heat exchange occurs through the conduction of the walls and the convection of the fluids at the wall surface.
2. Regenerative Heat Exchangers: These exchangers 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 goal of heat transfer.
3. Indirect Fluid-to-Fluid Heat Exchangers - These heat exchangers connect two surface heat exchangers through a heat carrier that circulates 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.
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, etc.
5. A dual-surface heat exchanger that combines both water-to-water indirect heat exchange and water-to-vapor surface indirect heat exchange. Compared to the water-to-vapor surface indirect heat exchange, it offers higher heat exchange efficiency; compared to water-to-vapor direct mixing heat exchange, it provides greater stability and lower unit noise.
III. Categorized by Application
1. The heater is designed to heat fluids to the required temperature 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 a 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.
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.
