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 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
Shell-and-tube heat exchangers allow two fluids with different temperatures to flow in separated spaces on either side of the wall. Heat exchange occurs between the fluids through the wall's thermal conductivity and convection 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 Connection Heat Exchanger - This type of heat exchanger connects 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 dual-effect heat exchanger that combines both surface-type indirect heat exchange between steam and water and direct mixed flow heat exchange between water. Compared to surface-type indirect heat exchange with steam and water, it offers higher heat exchange efficiency; and compared to direct mixed heat exchange between steam and water, it boasts greater stability and lower unit noise.
3. By Application Category
1. The heater is designed to heat fluids to the required temperature without causing a phase change in the heated fluid.
2. Preheaters preheat the fluid, providing standard process parameters for the operation.
3. Superheater - A superheater is used to heat a fluid (process gas or steam) to a superheated state.
4. Evaporator - Used to heat fluids to temperatures above their boiling point, causing the fluid to evaporate, typically involving a phase change.
IV. Categorized by Structure
Available options include: floating head heat exchangers, fixed tube sheet heat exchangers, U-tube sheet heat exchangers, plate heat exchangers, etc.
