When the machine is started up under hot conditions, can the shell-and-tube heat exchanger be used for cooling at the same time?
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When starting the machine up under hot conditions, can the shell-and-tube heat exchanger be used for cooling at the same time? I’d like to learn more about this.
It should be possible; after hot startup, the cold tower should be completely cooled down, right? Please give some advice.
We require that cooling cannot occur simultaneously; the shells need to be isolated from each other. Avoid structural damage caused by simultaneous cooling. So, I need someone who knows about this structural damage to explain it
No, the main concern is that thermal stress could cause the weld to crack
It’s possible, but it requires very strict control over the cooling rate, and it’s not cost-effective. By slowing down the cooling of the main component, the cooling rate in other areas also slows down, resulting in high operating costs. It’s better to first cool the other areas properly and then cool the main component separately; this makes it easier to control the costs and reduces them as well.
Why isn’t the entire heat exchanger torn apart by stress when the tube side has cooled while the shell side has not?
It seems your question is a bit contradictory. What is the capacity of your air separation unit, and do you have a schematic diagram of the main cooling system?