Tube-in-tube heat exchanger

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 such as 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 the flow of two fluids with different temperatures in a space separated by a wall. Heat exchange occurs between the fluids through conduction through the wall and convection at the wall surface.

2. Regenerative Heat Exchangers - These utilize a heat storage 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 goal of heat transfer.

3. Indirect Fluid Connect Heat Exchangers - These are heat exchangers that connect two surface-type heat exchangers via a heat transfer medium circulating within them. The heat transfer medium 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 equipment where two fluids come into direct contact and mix for heat exchange, such as in cooling towers, gas condensers, and so on.

5. A dual heat exchanger that combines both water-to-steam surface indirect heat exchange and water-to-water direct mixing heat exchange. Compared to the water-to-steam surface indirect heat exchange, it offers higher heat exchange efficiency; and compared to water-to-steam direct mixing heat exchange, it boasts greater stability and lower unit noise.

III. Categorized by Application

1. A heater is used to heat a fluid 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) to a superheated state.

4. Evaporators are used to heat fluids to temperatures above their boiling points, causing them to evaporate. This typically involves a phase change.

IV. Categorized by Structure

Available in: Floating Head Heat Exchangers, Fixed Tube Sheet Heat Exchangers, U-Type Tube Sheet Heat Exchangers, Plate Heat Exchangers, etc.