Atmospheric pressure heat exchanger is a heat exchange equipment working under high pressure conditions. It is widely used in chemical, petroleum, natural
gas, electricity, metallurgy, food processing and other industries. It is mainly used for heat exchange between fluids of different temperatures and pressures to achieve the purpose of heating or cooling.
Working principle of normal pressure heat exchanger
Normal pressure heat exchanger achieves the purpose of heating or cooling by heat exchange between two or more fluids. Under normal pressure environment, hot fluid transfers heat through the pipe or channel of the heat exchanger, and cold fluid absorbs heat through another channel. In this process, heat is transferred from high-temperature fluid to low-temperature fluid, causing the temperature to change.
The specific working steps are as follows:
1) Hot fluid enters high-pressure heat exchanger
The hot fluid (such as high-temperature gas or liquid) enters the hot side channel of the heat exchanger under high pressure conditions.
2) Heat transfer
The hot fluid transfers heat through the
metal surface separated from the cold fluid, and the heat is transferred to the cold fluid through the metal surface.
3) Cold fluid absorbs heat
The cold fluid (such as low-temperature liquid or gas) enters the cold side channel and absorbs heat, causing its temperature to rise.
4) Hot fluid and cold fluid flow out
After the heat exchange process is completed, the cooled hot fluid and the heated cold fluid are discharged from their respective outlets.
Types of atmospheric pressure heat exchangers
1) Shell and tube high pressure heat exchanger
This is one of the most common types. The structure consists of multiple tube bundles. The hot fluid flows through the tubes and the cold fluid flows in the outer shell of the tube. This structure is simple and suitable for heat exchange with large flow and constant pressure difference.
2) Plate atmospheric pressure heat exchanger
It consists of multiple metal plates arranged alternately. The hot fluid and the cold fluid flow alternately through different channels, and have high heat exchange efficiency. Plate heat exchangers are suitable for occasions with high space and volume requirements.
3) Spiral plate atmospheric pressure heat exchanger
Adopting a spiral plate design, the fluid flows between the spiral plates, which can effectively improve the heat exchange efficiency and is suitable for process environments at normal temperature and pressure.
4) Fin tube heat exchanger
This type of heat exchanger increases the heat exchange area by adding fins to the surface of the tube. It is often used for heat exchange between gas and liquid and is suitable for general working pressure and large temperature difference.
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