Tube heat exchanger

Product Details

I. Definition

Heat ExchangerA heat exchanger is a device that transfers a portion of the heat from a hot fluid to a cold fluid, also known as a heat exchanger. It plays 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 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. Heat Storage Heat Exchanger - The heat storage heat exchanger utilizes a heat storage medium composed 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 passes through the solid material to be heated, achieving the goal 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-type indirect heat exchange for steam and water and direct mixed flow heat exchange for water. Compared to the surface-type indirect heat exchange for steam and water, it offers higher heat exchange efficiency; compared to direct steam-water mixing heat exchange, it has greater stability and lower unit noise.

3. By Application Category

1. A heater is used to heat fluids to the required temperature without causing any 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. Evaporator - Used to heat fluids to temperatures above their boiling point, causing the fluid to evaporate, typically involving a phase change.

4. By Structural Classification

They can be divided into: floating head heat exchangers, fixed tube sheet heat exchangers,U-shaped tube plate heat exchangers, plate heat exchangers, etc.