System for warming pressurized gas

A method for warming pressurized gas comprising:

• storing a gas under a system pressure in a closed system comprised of a plurality of fluidly communicating vessels;
• wherein said vessels are comprised of a first vessel and a second vessel, said first vessel being situated within said second vessel;
• conducting heat from the gas within said second vessel to the gas within said first vessel by inserting heat conduction means into said system so that said heat conduction means are exposed to the gas within said first vessel and the gas within said second vessel;
• forcing the gas to flow from said first vessel to said second vessel by exhausting the gas from the system to a downstream pressure lower than said system pressure and feeding the exhausted gas to a combustor;
• and
• heating the gas in a heat exchanger as said gas flows from said first vessel to said second vessel, the heat exchanger being positioned outside of the second vessel.

A method for delivering a gaseous oxidant under pressure to a combustor from a system closed off from the combustor comprising:

• conducting heat from the gaseous oxidant within a first vessel to the gaseous oxidant within a second vessel by inserting heat conduction means into said second vessel so that said heat conduction means are exposed to the gaseous oxidant within said first vessel and the gaseous oxidant within said second vessel;
• opening an exhaust valve to open said system and allowing the gaseous oxidant contained under pressure in said first vessel to flow from said first vessel through said exhaust valve to a combustor and allowing a gaseous oxidant contained under pressure in said second vessel to flow from said second vessel through a line to said first vessel wherein said second vessel is situated within said first vessel;
• and
• heating said gaseous oxidant flowing in said line from said second vessel to said first vessel for increasing a temperature of gaseous oxidant flowing in said line.