Integrated gas turbine cycle and liquid air energy conversion system

A method of energy recovery from liquid air, comprising the steps of:

• (a) receiving one or more very high pressure air streams from vaporization of the liquid air;
• (b) receiving one or more moderate pressure cryogenic gas streams;
• (c) expanding a stream of combustion gas to yield a flue gas exhaust stream and shaft work used to create a first source of electrical power;
• (d) cooling the flue gas exhaust stream to yield a cooled waste stream via indirect heat exchange with:
• (i) all of or a portion of the one or more very high pressure air streams to yield a first warmed stream;
• and (ii) all of or a portion of the one or more moderate pressure cryogenic gas streams to yield a second warmed stream;
• (e) expanding the first warmed stream in a first turbine-expander configured to produce a first moderate pressure exhaust stream and shaft work used to create a second source of electrical power;
• and
• (f) expanding the second warmed stream or the first moderate pressure exhaust stream in a second turbine-expander to produce a second moderate pressure exhaust stream and shaft work used to create a third source of electrical power;
• wherein the combustion gas is produced from the combustion of a fuel source with one or more oxygen containing streams, and wherein at least one of the oxygen containing streams is a moderate pressure supplemental stream;
• and
• wherein the one or more moderate pressure cryogenic gas streams comprises a pre-purified air stream at a pressure in the range of about 3 bar (a) to 10 bar (a) and that has a normal boiling point equal to or less than −150° C.