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, 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

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 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 is a heat exchanger that connects two surface heat exchangers through 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 in the heat exchanger.

4. Direct-contact heat exchangers, also known as mixed heat exchangers, are equipment 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 and direct water-to-water mixing heat exchange. Compared to surface-to-surface indirect heat exchange, it offers higher heat exchange efficiency; compared to direct water-to-water mixing heat exchange, it has greater stability and lower equipment noise.

Section 3: Categorized by Application

1. A heater is a device used to heat fluids to the required temperature without causing a phase change in the 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 point, causing the fluid to evaporate, typically involving a phase change.

Section 4: Categorized by Structure

Available options include: floating head heat exchangers, fixed tube sheet heat exchangers, U-tube plate heat exchangers, plate heat exchangers, etc.