Product Details
I. Definition
Heat exchangers, also known as heat exchanges, are devices that transfer a portion of the heat from a hot fluid to a cold fluid. They play a crucial role in many industrial processes such as chemical, petroleum, power, food, and others. In chemical production, heat exchangers can serve as heaters, coolers, condensers, evaporators, and reboilers, 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 utilize a regenerative body 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 Exchangers - These are heat exchangers that connect two surface heat exchangers through 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-to-surface indirect heat exchange between steam and water, and direct mixed flow heat exchange between water. Compared to the surface-to-surface indirect heat exchange with steam, it boasts higher heat exchange efficiency; compared to direct steam-water mixing heat exchange, it offers greater stability and lower unit noise.
Section 3: Categorized by Application
1. Heater - A heater is used to heat fluids to the necessary 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 - Used to superheat fluids (process gas or steam).
4. Evaporators are used to heat fluids to temperatures above their boiling points, causing them 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.
