Regarding the heat exchange equipment in the transformation section
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In the shift section, it is determined by what factors decide whether the shift gas and hot water in the water heater, as well as the shift gas and semi-water gas in the main heat exchanger, are on the outside or inside the tubes
In the shift heat exchanger, semi-water gas flows inside the tubes while shift gas flows outside the tubes； The water heater has the process gas flowing through the outer tubes, while the soft water flows through the inner tubes. There are many factors at play, such as corrosion issues and resistance problems. Take heat exchangers as an example: to prevent corrosion, there is usually a section of stainless steel pipe at the bottom of the heat exchanger, with semi-water gas flowing through these pipes, which helps to **reduce the occurrence of corrosion** ； Additionally, by having the soft water pass through the tubes of the water heater, the resistance of the water can be reduced. It's just my personal opinion; feel free to discuss it.
It seems that these areas are all hot, and heat flows through the spaces between the tubes
In our plant, the soft water used for the water heaters flows through the tubes outside, while the shift gas flows through the tubes inside; now there is a leak inside the tubes of the water heaters. . .
Of course, thermal expansion and contraction are taken into account; heat should be on the outside, that is, between the tubes, while cold should be on the inside. Otherwise, a heat sink approach would be necessary.
Generally, the heat-exchanged fluid flows inside the tubes, that is, in the tube side, while it flows outside the tubes, that is, on the shell side