Shell and tube heat exchanger

Product Details

I. Definition

Heat exchanger, also known as a heat exchanger, is a device that transfers a portion of the heat from a hot fluid to a cold fluid. It plays a crucial role in many industrial processes, including chemicals, petrochemicals, power, food, and numerous other industries. In chemical production, heat exchangers can act as heaters, coolers, condensers, evaporators, and reboilers, with widespread 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 a wall, with heat transfer occurring through the wall's conduction and through convection at the wall surface between the fluids.

2. Regenerative Heat Exchangers utilize a solid heat 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 purpose of heat transfer.

3. Indirect Fluid Connection Heat Exchangers - These are heat exchangers that connect two surface heat exchangers via 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 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 steam-water heat exchange and direct water-water mixed flow heat exchange. Compared to surface-type indirect steam-water heat exchange, it offers higher heat exchange efficiency; and compared to direct steam-water mixing heat exchange, it has greater stability and lower unit noise.

Section 3: Categorized by Application

1. The heater is designed to heat fluids to the required temperature without causing a phase change in the fluid.

2. The preheater preheats the fluid, providing standard process parameters for the operation.

3. Superheaters are used to superheat fluids (process gas or steam).

4. Evaporator - An evaporator is used to heat a fluid to temperatures above its boiling point, causing the fluid to evaporate, usually involving a phase change.

IV. 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, etc.