I would like to ask why heating is not required when using CO2 gas cylinders for gas supply?
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I checked and found that the critical point of CO2 is 31°C and 7.4 MPa. Gas cylinders are generally filled to 20 MPa, and they are definitely in a liquid state at room temperature. I’m working on a mixed gas project now, and the supplier says there’s no need to heat the CO2 cylinders – the gas is ready to use right away. I’m not sure why that is
At normal temperature and pressure, CO2 is a gas. Is heating still needed?
The carbon dioxide in the cylinder can be either liquid or gaseous, and this depends on the ambient temperature. When using it, it is necessary to reduce the pressure: first, the gas phase is found at the top of the cylinder, meaning that what is used is gaseous carbon dioxide; second, the inside of the cylinder is at room temperature. After pressure reduction through a throttle, there is a slight drop in temperature (this can be ignored when the amount of gas is small), but it remains within the range of room temperature.
Common carbon dioxide cylinders are equipped with a heating device at their outlet.