Product Details

I. Definition

Heat exchangers, also known as heat exchange units, are devices that transfer a portion of heat from a hot fluid to a cold fluid. They play a crucial role in chemical, oil, power, food, and numerous other industrial production processes. In chemical production, heat exchangers can serve as heaters, coolers, condensers, evaporators, and reboilers, among others, with a wide range of applications.

II. Classified by Heat Transfer Principle

1. Shell-and-tube Heat Exchangers Shell-and-tube heat exchangers involve two fluids of different temperatures flowing in separate spaces separated by a wall. Heat exchange occurs between the fluids through the wall's thermal conductivity and convection at the wall surface.

2. Regenerative Heat Exchangers: These heat 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 Connection Heat Exchangers - These are heat exchangers that connect two surface 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.

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, such as in cooling towers, gas condensers, and the like.

5. A double-effect 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 boasts higher heat exchange efficiency; and compared to water-to-vapor direct mixing heat exchange, it offers greater stability and lower equipment noise.

III. Categorized by Application

1. A heater is used to raise the temperature of a fluid to the required level without causing any phase change in the heated fluid.

2. Preheaters preheat the fluid, providing standardized process parameters for operation.

3. Superheater - Used to superheat fluids (process gas or steam).

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.