LPG storage Tank for storing Carbon Dioxide
LPG storage Tank for storing Carbon Dioxide
(OP)
We are setting up a plant where CO2 will be used in gaseous form at pressure of 6kg/cm2 and temperature 25-35 deg Celsius. We will use approximately 10MT to 15MT of CO2/month initially. We already have 3 LPG storage tanks of 30MT,& 2 nos. 20MT. I wish to know if we can use these tanks to store CO2 with modifications (insulations)? The design pressure of these tanks is 14.76 kg/cm2 and what I got to know from various sources, LCO2 is generally stored in vessels having pressure range of 22 kg/cm2 to 28 kg/cm2. To use the CO2 in gaseous form, what kind of machinery do we need, if we purchase liquid CO2? Please help.





RE: LPG storage Tank for storing Carbon Dioxide
On topic, you have 2 issues. 1) you need to vaporize liquid CO2, and 2) you need to assure that the pressure of the gas is reduced by at least 35% before it gets to your storage tank.
The LPG tanks don't care if they are filled with CO2 or LPG, as long as it is dry, the temperature is over something like -15° to -20°C, the pressure never exceeds their rating, and they are protected from impact.
Typical LPG tanks are fabricated of carbon steel. Yours could be special, and made of austenitic stainless or aluminum or titanium. You don't say. If they are of carbon steel or non-austenitic stainless, they must be protected from getting too cold, because those materials lose about 50% (+/- 10%) of their "toughness" (more or less, impact resistence) at -15° to -20°C. So, you must have vaporizors that are designed and sized to assure that all the liquid is flashed off AND heated to at least ambient temperature before reaching your tanks. However, the vaporizers will only reduce the pressure slightly. So you will need a pressure reducing valve system and an intermediate tank that is rated at the full pressure or the LCO2.
RE: LPG storage Tank for storing Carbon Dioxide
At 14 kg/cm^2, the tanks will have operate at -27C, right at the tanks minimum temperature. Next, CO2 weight more than water at these conditions. The foundations and tank stress are not normall designed to have the weight of water in the vessel and tank could collasps with over twice the mass than they were designed for.
RE: LPG storage Tank for storing Carbon Dioxide
www.union.dk
If you wish to have liquid co2 at amb temperature youneed a pressure higher than 70 barg.
Best regards
Morten
RE: LPG storage Tank for storing Carbon Dioxide
2) You will need to get a vaporizer if you store liquid CO2 but need it in gaseous form.
RE: LPG storage Tank for storing Carbon Dioxide