Installation of intermediate baffles or tubes in U-tube heat exchangers
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In U-tube heat exchangers, when the short-circuit width between the tube bundles on the back side of the partition diaphragm is large, an intermediate baffle should be installed... How is this short-circuit width defined? Are there any recommended values or empirical values?
The intermediate baffle is installed to prevent short circuits; when the short-circuit width exceeds 16 mm, a short-circuit prevention mechanism should be in place. (GB/T151-2014 P35 6.8.3)
A pipe stop is installed on the back side of the partition groove. If the short-circuit width is set at 16 mm, the distance in the middle of U-tube heat exchangers is greater than 16 mm; does this mean that a pipe stop needs to be installed in all such cases?
The standards provide the principles for setting things up, which I think we should follow when designing.
This should be more flexible; the main reason for the low resistance in this channel is to prevent the medium from passing through directly without undergoing heat exchange, which would affect the efficiency of heat exchange. But when the diameter of the heat exchanger is large and a saturated medium enters it, condensation occurs during the heat exchange process, resulting in a large volume of steam; sometimes additional channels are needed to allow the medium to flow smoothly into the interior where the heat exchange takes place
It is related to the diameter of the shell; in cases where the diameter is very large, it becomes difficult for the medium to reach the middle part of the tube bundle, resulting in poor heat exchange efficiency. In such situations, not only are no baffles used, but channels are also added.
Function of baffle plates in heat exchangers: 1. Increase turbulence； 2. Reduce dead zone ； 3. Extend the process ； Improve heat exchange efficiency. 4. It serves to support and position the heat exchange tubes.