Product Details
I. Definition
Heat exchangers, also known as heat exchangers, are devices that transfer a portion of the heat from a hot fluid to a cold fluid. They play a crucial role in many industrial processes, including chemical, petrochemical, power, food, and numerous other industries. In chemical production, heat exchangers can function 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 operate by allowing two fluids of different temperatures to flow in separated spaces between walls. Heat transfer occurs through the wall's thermal conductivity and convection on the fluid's surface against the wall, facilitating heat exchange between the two fluids.
2. Heat Storage Heat Exchangers: These utilize a heat storage medium made of solid materials 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 heat transfer objective.
3. Indirect Fluid Connection Heat Exchangers - These are heat exchangers that connect two surface heat exchangers through a circulating heat medium. The heat 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 in the heat exchanger.
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 dual heat exchanger that combines both surface-type indirect heat exchange between steam and water and direct mixed flow heat exchange between water. Compared to surface-type indirect heat exchange between steam and water, it offers higher heat exchange efficiency; compared to direct mixed heat exchange between steam and water, it boasts 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 heated fluid.
2. The preheater preheats the fluid, providing standardized process parameters for the operation.
3. Superheater - Used to superheat fluids (process gas or steam) to a superheated state.
4. Evaporator - Used to heat fluids to temperatures above their boiling point, causing the fluid to evaporate, typically involving a phase change.
IV. Categorized by Structure
Available in: Floating Head Heat Exchangers, Fixed Tube Sheet Heat Exchangers, U-Tube Sheet Heat Exchangers, Plate Heat Exchangers, etc.
