Product Details
I. Definition
Heat exchangers, also known as heat exchange devices, transfer a portion of 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 Exchangers Shell-and-tube heat exchangers involve two fluids of different temperatures flowing in separated spaces between walls. Heat exchange occurs between the fluids through the wall's thermal conductivity and convection at the wall surface.
2. Heat Storage Heat Exchangers: Heat storage heat exchangers transfer heat from a high-temperature fluid to a low-temperature fluid through a heat storage medium composed of solid materials. The heat medium first heats the solid material to a certain temperature, and then the cold medium is heated through the solid material to achieve the purpose of heat transfer.
3. Indirect Fluid-to-Fluid Heat Exchangers - These are heat exchangers that 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 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 steam-water heat exchange and direct water-water mixed flow heat exchange. Compared to surface-type indirect steam-water heat exchange, it offers higher heat exchange efficiency; and compared to direct steam-water mixed heat exchange, it has 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 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 points, causing the fluid to evaporate, generally 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.
