Regarding the one-sided heating of the U-tube heat exchanger during temperature rise vulcanization in the transformation section
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During the heating up process for vulcanization in the conversion section, nitrogen enters the shell side of a feed gas heater at a temperature of around 200–340°C, after passing through the outlet of the first conversion furnace. Since this heat is also needed to heat the second conversion furnace, the cold air does not flow through the tube side of this heat exchanger; instead, it goes through a bypass of the tube side. Does this situation have any impact on the heat exchanger? I mainly want to ask: If the heat exchanger only has one path for the high-temperature material, and the low-temperature material does not pass through it, will that have any impact on the heat exchanger? (The temperature of the high-temperature material is within the design range)
The side without a medium is in a sealed and heated state; as it is heated, the pressure of the gas inside increases. If the pressure and temperature remain within the designed range, I think it’s acceptable, but if they exceed that range, it becomes problematic. If there are other alternatives, it’s better not to have pressure applied only in one direction
There is no problem with heating only one side of a U-tube heat exchanger, and when the hot fluid flows through the shell side, both the shell and the heat exchange tubes are heated simultaneously.