Freezing in the CO2 tube side of the feed gas cooler? Why does this happen?
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The freezing point of CO2 is -79 degrees Celsius at standard atmospheric pressure. The CO2 pressure coming out of the CO2 separation tower is around 0.4 MPa, and the temperature changes; what will happen as a result? Under normal production conditions, freezing of the CO2 tube side shouldn’t occur. Has anyone encountered this situation? Please help explain it. Thank you very much
To put it more clearly, where in the raw gas heat exchanger does freezing occur?
It should not freeze; CO2 heats up rapidly through heat exchange with the feed gas, so the temperature does not drop to a level at which freezing can occur.
The pressure is too low; it must be maintained at above 0.7 Mpa
Could it be that the temperature of the purification gas is too low, or that the purification gas has leaked into the CO2? Logically, after two heat exchange processes – with the temperature rising to around 2°C in the first step and to around 30°C in the second – it’s impossible for CO2 to freeze.
Is it dry ice produced by decompressing carbon dioxide? ? ?