3 replies to this topic

[Phenom]

Hello everyone. I need to design a system for supplying CO₂ from a cylinder. The conditions of the cylinder are 60barg pressure and at 35°C. The purity of gas in the cylinder is 100%. The pressure at the delivery point should be 0.5barg.

Can anyone help me with this. The problem encountered is frosting of gas when the pressure is reduced.

Thanks in advance.

[ankur2061]

phenom.sam,

Refer the attachment provided. This should help you in geting at some conclusion.

Regards,
Ankur

Attached Files

•  Doc_67_08_E.pdf   294.91KB   25 downloads

[Phenom]

Thank you sir

[kkala]

Hello everyone. I need to design a system for supplying CO₂ from a cylinder. The conditions of the cylinder are 60barg pressure and at 35°C. The purity of gas in the cylinder is 100%. The pressure at the delivery point should be 0.5barg. Can anyone help me with this. The problem encountered is frosting of gas when the pressure is reduced.Thanks in advance.

I understand you mainly need data on the connecting piping to avoid frosting. Having no experience in CO2 handling, attached "FO.bmp" shows a high pressure nitrogen cylinder connected to a fuel oil accumulator (in a fuel oil supply system to a boiler). Based on this example, the attached "CO2.xls" has been prepared as a first scheme for further investigation and development.
CO2 in the bottle (cylinder) is gas under mentioned conditions, not far from its critical, as indicated in http://en.wikipedia....Carbon_dioxide . Rough values of CO2 enthalpy indicate increase with decreasing pressure at constant temperature (CO2.xls). To avoid effect of freezing, enthalpy loss has to be given as heat (e.g. through a heat exchanger), so that CO2 temperature remains at 35 oC after the pressure reduction. Rest is similar to "FO.bmp" and explained in the attached "CO2.xls", where a preliminary rough diagram is also presented.
Hopefully this incomplete diagram (e.g. what happens if heating medium fails, what is CO2 temperature downstream exchanger, etc) is useful. Comments could help in necessary improvements.

Attached Files

•  FO.bmp   350.06KB   18 downloads
•  CO2.xls   43KB   28 downloads