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The general types of methods for enhancing heat transfer in Hubei chemical machinery shell courses.

Classification: Company Dynamics

Time2019-01-19

One is to change the form of the shell-side baffle or tube support to reduce or eliminate the stagnant dead zones in the shell-side flow and heat transfer, so that the heat transfer area can be fully utilized. Examples include baffle heat exchangers, hollow ring heat exchangers, spiral baffle heat exchangers, etc.

　　First, change the form of the shell-side baffle or tube support to reduce or eliminate the stagnant dead zones in the shell-side flow and heat transfer, making full use of the heat transfer area. Examples include baffle rod heat exchangers, hollow ring heat exchangers, and spiral baffle heat exchangers.

　　Second, change the shape of the tubes or add fins to the outside of the tubes, that is, enhance heat transfer by modifying the shape or surface properties of the tubes to improve the efficiency of the heat exchanger. Examples include grooved tubes, finned tubes, porous surface tubes, and nail head tubes.

　　For the second situation mentioned earlier, I would like to introduce a method here.

　　1. Different forms of baffle heat exchangers

　　2. Baffle rod heat exchangers

　　In the early 1970s, to solve the problem of natural gas flow vibration, Phillips Company in the United States changed the baffles in shell-and-tube heat exchangers to a rod support structure, developing the baffle rod heat exchanger. Research shows that this type of heat exchanger not only prevents vibration but also increases the heat transfer coefficient. This heat exchanger is widely used in various conditions of single-phase boiling and condensation. Its overall heat transfer coefficient is 40-60% higher than that of ordinary baffle heat exchangers, and it has good vibration resistance. The baffle rod support structure is combined with enhanced heat transfer tubes such as spiral groove tubes, transverse groove tubes, bottom finned tubes, and T-shaped finned tubes to form a composite enhanced heat transfer technology.

　　The baffle rod heat exchanger is currently a widely used new type of shell-and-tube heat exchanger.

　　3. Hollow ring heat exchangers

　　The hollow ring shell-and-tube heat exchanger developed by Hubei Xianghua Machinery is a new type of shell-and-tube heat exchanger invented in China in the 1990s. The hollow rings are short sections cut from smaller diameter steel pipes, evenly distributed across the same cross-section between the heat exchange tubes, forming linear contact. Under the action of the tightening device's bolt force, the tube bundle is relatively tightly fixed. The hollow ring as a support form has been successfully applied in small nitrogen fertilizer plants. It is reported that under the same conditions, although its heat transfer area can be reduced by 35% compared to single arch supports, the heat transfer rate can increase by 38%, and pump power can be reduced by 75%.

　　4. Spiral baffle heat exchangers

　　The spiral baffle heat exchanger is a newly developed type of shell-and-tube heat exchanger proposed by ABB in the United States. Unlike the conventional parallel arrangement of baffles, its baffles form a special spiral structure, with each baffle at a certain angle to the flow direction of the shell-side fluid, causing the shell-side fluid to spiral. This reduces the dead zones prone to scaling between the tube sheet and the shell, thereby improving heat transfer efficiency. In gas-water heat exchange situations, this heat exchanger can reduce the heat transfer area by 30%-40% while transferring the same amount of heat, saving 20%-30% in materials. This heat exchanger is particularly suitable for handling fluids containing solid particles, dust, and silt.

　　5. Twisted tube heat exchangers

Keyword： The general types of methods for enhancing heat transfer in Hubei chemical machinery shell courses.

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Xianghua Machinery Xianghua Machinery

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