Product Details

I. Definition

Heat exchangers, also known as heat exchanges, are devices that 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, petroleum, power, food, and many others. In chemical production, heat exchangers can serve as heaters, coolers, condensers, evaporators, and reboilers, among other functions, with wide applications.

II. Classified by Heat Transfer Principle

1. Shell-and-tube heat exchangers are designed for heat exchange between two fluids of different temperatures. These fluids flow in separate spaces separated by walls, where heat is transferred through the wall's conduction and convection at the fluid's surface.

2. Regenerative Heat Exchangers: These 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 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.

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-vapor indirect heat exchange and direct water-to-water mixed flow heat exchange. Compared to surface-to-vapor indirect heat exchange, it offers higher heat exchange efficiency; and compared to direct vapor-water mixing heat exchange, it has higher stability and lower equipment noise.

Section 3: Categorized by Usage

1. A heater is a device used to heat fluids to the necessary temperature without causing a phase change in the fluid.

2. The preheater preheats the fluid, providing standard 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.

Section 4: Categorized by Structure

They can be categorized into: floating head heat exchangers, fixed tube sheet heat exchangers, U-tube sheet heat exchangers, plate heat exchangers, and more.