Heat exchange equipment has the advantages of high heat transfer efficiency and easy installation. We have talked a lot about its technical knowledge before. Today we will look at the structure and heat transfer of pharmaceutical and chemical plate heat exchangers.
Plate type structure : Plate type and structure parameters have a great impact on the heat transfer of pharmaceutical and chemical plate heat exchangers. Different plate types can cause significant differences in fluid flow in the channels between the plates. Different corrugated structure parameters of the same plate type will result in different flow conditions, making it suitable for heat transfer under different operating conditions. Process combination: The uniformity of the fluid flow distribution is also reflected in the way the process is combined. For general symmetrical flow channel, when the flow of two different media is approximately equal, the process combination should also be as equal as possible;
If the difference between the two sides of the flow is large, the side with small flow can choose to use multiple processes to increase the flow and obtain a relatively high heat transfer coefficient, while the side with large flow uses fewer processes to reduce the resistance of the production equipment. Selection of flow velocity: The flow velocity between the plates affects the heat transfer performance and pressure drop of the fluid. Although the heat transfer coefficient is higher at high flow rates, the drop in fluid resistance is also greater. When the flow velocity is less than 0.2 m/s, the fluid will not reach the turbulent state and a large dead zone will be formed.
The next point is the asymmetric type: according to the heat transfer characteristics of hot and cold fluids and pressure drop requirements, the asymmetric type changes the waveform geometry on both sides of the plate, forming a hot and cold flow channel unequal flow cross-section. The asymmetric heat transfer coefficient decreases slightly and the pressure drop drops significantly. When the cold and hot medium flow is relatively large, the use of asymmetric single flow can reduce the plate area by 15%-30% compared to symmetric single flow. In recent years, China has emerged asymmetric channel, while foreign countries have adopted the "thermal mixing" plate combination mode, allowing heat, flow, pressure drop is not balanced.
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