Energy production system

An energy production system (1), utilising ammonia for storage of electrical power and hydrogen for production of electric power wherein:

• a reversible electrochemical cell system (2) adapted for production of hydrogen from electric power in an electrolysis mode when the energy production system (1) runs in electric power storage mode and production of electric power from hydrogen in fuel-cell mode when the production system runs in electric power production mode;
• an air separator (3) adapted to achieve at least 96% pure N2, wherein the air separator is arranged to provide N2 to the ammonia synthesis reactor (6) when the energy production system (1) runs in electric power storage mode;
• an ammonia synthesis-and ammonia cracker reactor comprising a catalyst, wherein the synthesis reactor is arranged to receive H2 from the reversible electrochemical cell system (2) and N2 from the air separator (3) when the energy production system (1) runs in electric power storage mode and wherein the ammonia cracker decompose the ammonia into N2 and H2 in electric power production mode thereby providing a H2 gas stream to the reversible electrochemical cell system (2),
• an ammonia separation reactor (7) comprising a solid absorbent material which separates ammonia from N2 and H2 and adapted for receiving ammonia, and unreacted N2 and H2 from the ammonia synthesis-and ammonia cracker reactor and providing ammonia to the ammonia storage unit (8) when the energy production system (1) runs in electric power storage mode and;
• an ammonia storage unit (8) comprising a metal halide adapted to store ammonia wherein the ammonia storage unit is arranged to receive ammonia from the ammonia synthesis-and ammonia cracker reactor and/or an ammonia separation reactor (7) when the energy production system (1) runs in electric power storage mode and arranged to provide ammonia to the ammonia synthesis-and ammonia cracker reactor when the energy production system (1) runs in electric power production mode;
• a heat transfer system comprising at least one heat exchanger (16 a, b, c, d, e, f, g) adapted to transfer heat generated in the energy production system (1).