Carbon dioxide is a widely used industrial gas. The critical temperature to liquefy carbon dioxide is 31.26°C, and the critical pressure is 7.38MPa. Normally, the critical pressure required to liquefy a gas decrease with temperature decrease. For example, carbon dioxide gas will liquefy when pressurized to 5.7MPa at 20°C and when pressurized to 4.5MPa at 10°C. All in all, carbon dioxide gas is easily liquefied by pressurization at room temperature, and the key measure to keep carbon dioxide in a liquid state is low temperature and high pressure.
Carbon Dioxide Booster Pumps Comparison
From the above chart, we can see that the liquid carbon dioxide booster pump can only handle liquefied carbon dioxide, while the multiphase carbon dioxide booster pump can handle both gaseous and liquid carbon dioxide. Therefore, you should choose the appropriate CO2 booster pump according to the phase of your source carbon dioxide.
Dewar flasks, cryogenic storage tanks, ISO tanks and steel cylinders are the most common sources of carbon dioxide. Dewar flasks, Cryogenic storage tanks and ISO tanks store pure liquid carbon dioxide at low-temperature and low-pressure, so the liquid carbon dioxide pump is suitable. What stored in steel cylinders is liquid carbon dioxide at normal temperature and high pressure. However, it will be converted into a gas-liquid mixture during transportation and storage. If you use the liquefied carbon dioxide booster pump, it can handle liquid CO2 only, so the remaining carbon dioxide gas and vapor in the cylinder will be wasted. Therefore, the multiphase carbon dioxide booster is more suitable.
Precautions of Using Carbon Dioxide Booster Pumps
Liquid carbon dioxide is easy to gasify quickly after being released from LCO2 cryogenic storage tanks, in order to ensure the pressurization effect, you should place the liquid carbon dioxide pump as close as possible to LCO2 storage tank. If your local ambient temperature is high, or the pump is far away from LCO2 tank, you should wrap the liquefied carbon dioxide supply pipeline with thermal insulation material to prevent some liquid carbon dioxide from gasification before entering the pump, which will cause CO2 pump body to frost.
