Method for liquid air and gas energy storage

A method for a liquid air and gas energy storage (LAGES) comprising in combination:

• delivering a liquefied natural gas (LNG) from a tank of a LNG Storage and Re-gasification (LNGSR) terminal into a co-located Liquid Air Energy Storage (LAES) facility for continuous re-gasifying the LNG at said LAES facility and final injecting a produced high-pressure natural gas (NG) into a transmission pipeline;
• interchanging a waste thermal energy between the LNG being re-gasified and a process air being continuously liquefied at the LAES facility;
• round-the-clock charging said LAES facility through consuming a grid power for continuous production of a liquid air with storing said liquid air only at the periods of a low demand for the grid power;
• discharging the LAES facility, resulting in generating the grid power at the periods of a high demand for said grid power through consuming the liquid air both produced at said periods and stored at the LAES facility at the periods of the low demand for the grid power;
• and
• wherein the improvements comprise in combination:
• delivering the LNG from the LNGSR terminal at a low pressure and a first low temperature during discharging the LAES facility;
• deep cooling a delivered LNG down to a second low temperature through recovering a minor part of a cold thermal energy of the liquid air consumed during discharging the LAES facility;
• controlled dividing a deeply cooled LNG into two parts, a first of which is immediately pumped at a high pressure and re-gasified at the LAES facility thus, forming the high-pressure NG produced during discharging said LAES facility;
• re-liquefying a portion of the high-pressure NG through recovering a major part of the cold thermal energy of the liquid air consumed during discharging the LAES facility;
• depressurizing and recycling at least a part of a re-liquefied NO into the tank of the LNGSR terminal;
• storing a second part of the deeply cooled LNG at said low pressure and said second low temperature at the periods of the high demand for the grid power;
• and
• pumping the second part of the deeply cooled LNG at said high pressure and re-gasifying it at the LAES facility thus, forming the high-pressure NG produced at the periods of the low demand for the grid power.