Views: 2 Author: Site Editor Publish Time: 2023-02-03 Origin: Site
Advantages of U-tube heat exchanger - introduction to working principle
The U-tube heat exchanger is characterized by free expansion and contraction of the tube bundle, no thermal stress due to the temperature difference between the shells and tubes, and good thermal compensation performance; the tubes are double tubes, the process is longer, the flow rate is higher, and the heat transfer performance is better. Good; strong pressure bearing capacity; the tube bundle can be pulled out from the shell, which is convenient for maintenance and cleaning, and the structure is simple and the cost is cheap. However, it is inconvenient to clean inside the tubes, and it is difficult to replace the tubes in the middle part of the tube bundle. Since the bending radius of the innermost tubes cannot be too small, the distribution of tubes in the center of the tube sheet is not compact, so the number of tubes cannot be too many, and there is a gap in the center of the tube bundle, so that The shell side fluid is easy to short circuit and affect the shell side heat transfer.
Advantages of U-tube heat exchanger - what are the advantages
1. Compact structure, small size, saving station building area and building height (occupied area is about 1/2 of the general shell-and-tube heat exchanger, and the height can be reduced by 30~40%). It saves construction investment, facilitates design and layout, and is convenient to operate at the same time.
2. Good heat transfer performance, low heat medium outlet temperature, high heat energy utilization rate, and good energy-saving effect. Good hydraulic characteristics, low flow resistance of heat medium and heated water, good energy saving effect.
3. High heat transfer coefficient, saving heat transfer area (TQN, TQK) The heat transfer coefficient (K value) of the steam-water heat exchanger is about twice the actual heat transfer coefficient of the plate-type steam-water heat exchanger, and the heat transfer area can be reduced 40~60%.
4. The temperature of the condensed water discharged from the U-tube steam-water heat exchanger is low (TQK) series below 65°C, (TQN) series below 80°C, there is no loss of steam leakage, and there is no need to install steam traps. The piping system is simple, Heat dissipation loss is small. The space between the tubes of the U-tube steam-water heat exchanger is larger than that of the general shell-and-tube heat exchanger, and the size and weight of each heat exchange unit are small, which is convenient for maintenance and cleaning.
U-tube heat exchanger advantages - features
Simple structure, only one tube plate, less sealing surface, reliable operation, low cost; the tube bundle can be withdrawn, and the cleaning between the tubes (shell side) is convenient. Light weight, suitable for high temperature and high pressure occasions. It is difficult to clean the tube side, and the fluid in the tube side must be a clean and non-fouling material. Since the tube needs a certain bending radius, the utilization rate of the tube sheet is low; the distance between the innermost layer of the tube bundle is large, and the shell side is easy to short circuit; the inner tube cannot be replaced , so the hug rate is high. The U-shaped tube heat exchanger is suitable for the occasions where the temperature difference between the tube and the shell wall is large or the shell side medium is easy to scale, while the tube side medium is clean and not easy to scale, and the occasions are high temperature, high pressure, and corrosive. Generally, high-temperature, high-pressure, and highly corrosive media go in the pipe, but the high-pressure space is reduced, the seal is easy to solve, and it can save materials and reduce heat loss.
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