Disclosed techniques include working fluid exergy recovery using hybrid processing. A supply of working fluid at a first pressure and a first temperature is accessed. The working fluid is compressed. The compressing yields the working fluid at a second pressure. The second pressure is greater than the first pressure. The working fluid at the second pressure and a second temperature is warmed using a first heat exchanger. The second temperature is greater than the first temperature. The working fluid at the second temperature is in a gaseous state. The working fluid is expanded in a gaseous state to a third pressure. The expanding is accomplished using a first liquid piston expander. An engine is driven to recover work from the working fluid in a gaseous state. The engine is powered by liquid from the first liquid piston expander.

The present invention discloses a liquid air storage device, including a storage tank, a gas circulation outlet pipe, a gas circulation inlet pipe, and a pump. An input end of the gas circulation outlet pipe communicates with the lower part of an inner cavity of the storage tank, an output end of the gas circulation outlet pipe communicates with an input end of the pump, an output end of the pump communicates with an input end of the gas circulation inlet pipe, and an output end of the gas circulation inlet pipe communicates with the upper part of the inner cavity of the storage tank. The present invention further discloses a liquid air storage method and an air liquefaction apparatus that use the foregoing liquid air storage device.

A liquid air energy storage system, the system comprising: a liquid air storage means; an input of a first pump in fluid communication with the liquid air storage means; a first heat exchanger in fluid communication with an output of the first pump; a second heat exchanger in fluid communication first heat exchanger and configured to receive the fluid stream from the first pump and the first heat exchanger; a first expander turbine generator in fluid communication with the second heat exchanger; the first heat exchanger in fluid communication with the first expander turbine generator; a third heat exchanger in fluid communication with the first heat exchanger and configured to receive the fluid stream from the first expander turbine generator and the first heat exchanger; a second expander turbine generator in fluid communication with the third heat exchanger; the first heat exchanger in fluid communication with the second expander turbine generator; the fluid stream from second expander turbine generator and first heat exchanger in fluid communication with ambient atmosphere; a refrigerant stream in fluid communication with a third expander turbine generator; a fourth heat exchanger in fluid communication with the third expander turbine generator; a fourth expander turbine generator in fluid communication with the fourth heat exchanger; a fifth heat exchanger in fluid communication with the fourth expander turbine generator; the first heat exchanger in fluid communication with the fifth heat exchanger; an input of a second pump in fluid communication with the first heat exchanger, and configured to receive the refrigerant stream from the fifth heat exchanger and the and the first heat exchanger; the first heat exchanger in fluid communication with the output of the second pump; a sixth heat exchanger in fluid communication with the first heat exchanger, and configured to receive the refrigerant stream from the output of the second pump and the first heat exchanger; and the third expander turbine generator in fluid communication with the sixth heat exchanger. A liquid air energy storage system, the system comprising: a liquid air storage means; an input of a first pump in fluid communication with the liquid air storage means; a first heat exchanger in fluid communication with an output of the first pump; a second heat exchanger in fluid communication first heat exchanger and configured to receive the fluid stream from the first pump and the first heat exchanger; a first expander turbine generator in fluid communication with the second heat exchanger; the first heat exchanger in fluid communication with the first expander turbine generator; a third heat exc

A liquid air energy storage system, the system comprising: a liquid air storage means; an input of a first pump in fluid communication with the liquid air storage means; a first heat exchanger in fluid communication with an output of the first pump; a second heat exchanger in fluid communication first heat exchanger and configured to receive the fluid stream from the first pump and the first heat exchanger; a first expander turbine generator in fluid communication with the second heat exchanger; the first heat exchanger in fluid communication with the first expander turbine generator; a third heat exchanger in fluid communication with the first heat exchanger and configured to receive the fluid stream from the first expander turbine generator and the first heat exchanger; a second expander turbine generator in fluid communication with the third heat exchanger; the first heat exchanger in fluid communication with the second expander turbine generator; the fluid stream from second expander turbine generator and first heat exchanger in fluid communication with ambient atmosphere; a refrigerant stream in fluid communication with a third expander turbine generator; a fourth heat exchanger in fluid communication with the third expander turbine generator; a fourth expander turbine generator in fluid communication with the fourth heat exchanger; a fifth heat exchanger in fluid communication with the fourth expander turbine generator; the first heat exchanger in fluid communication with the fifth heat exchanger; an input of a second pump in fluid communication with the first heat exchanger, and configured to receive the refrigerant stream from the fifth heat exchanger and the and the first heat exchanger; the first heat exchanger in fluid communication with the output of the second pump; a sixth heat exchanger in fluid communication with the first heat exchanger, and configured to receive the refrigerant stream from the output of the second pump and the first heat exchanger; and the third expander turbine generator in fluid communication with the sixth heat exchanger. A liquid air energy storage system, the system comprising: a liquid air storage means; an input of a first pump in fluid communication with the liquid air storage means; a first heat exchanger in fluid communication with an output of the first pump; a second heat exchanger in fluid communication first heat exchanger and configured to receive the fluid stream from the first pump and the first heat exchanger; a first expander turbine generator in fluid communication with the second heat exchanger; the first heat exchanger in fluid communication with the first expander turbine generator; a third heat exc