For heat exchange in reactors, which is more effective: heat exchange through an external jacket or that through external coiled tubes?
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For heat exchange in reactors, which is more effective: heat exchange through an external jacket or that through external coiled tubes?
It depends on the operating conditions, especially regarding the impact on the gas phase zone of the reactor
It must be a jacket; since steam heating would turn it into a pressure vessel if a jacket is used. That’s why an external coil is employed to avoid regulatory inspections
This post was last edited by zjq1962 on 2019-4-29 08:28. From a heat transfer perspective, the semi-tube design offers better performance than the jacketed design (especially when the medium inside the semi-tube is in liquid form). With a jacketed structure, the thickness of the inner tube needs to be greater; whereas with a semi-tube design, the long welds and the complexity of manufacturing result in higher production costs, and quality issues are more likely to occur compared to the jacketed design. If guide vanes are added inside the jacket, the heat transfer efficiency will improve significantly.
The external jacket has a larger heat exchange surface, resulting in better performance.
The steam jacket is excellent; the outer semi-circular coil for liquids like frozen brine is great – no arguments allowed
The jacket is good, but it is difficult to maintain; it’s not as convenient to service as a heat tracing tube.
It’s definitely because the jacketed heat exchange is effective, and the cylinder doesn’t require as many welds. The external coil is complex to handle and costly, but when not classified as a pressure vessel, the actual costs are much lower. There is another type of internal coil that you can try.
The general principle is that jackets with built-in flow guide spirals are undoubtedly safe and reliable, and they are what we usually use； In special cases, if we consider a smaller heat exchange area in order to improve heat exchange efficiency, we can adopt an external half-tube heat exchange method.