METHOD FOR PRODUCING LOW-CARBON HYDROGEN FROM AMMONIA BY CRACKING AMMONIA AMMONIA CRACKING INDUSTRY-3000 AND PLANT FOR ITS IMPLEMENTATION Russian patent published in 2023 - IPC C01B3/04 B01D53/46 C01B5/00 C01B3/56 

FIELD: fuel industry.

SUBSTANCE: production of low-carbon hydrogen used as a carbon-neutral fuel or for compression and transportation through main fuel systems to the end consumer. To obtain hydrogen from ammonia, liquid ammonia is pumped by pump 1. Liquid raw ammonia is heated, evaporated and overheated in coil 8 of the heat-energized equipment plant (HEP). Gaseous raw ammonia is supplied to the ammonia cracking reactor 4, the nitrogen-hydrogen mixture obtained as a result of ammonia cracking is cooled in the air-cooling apparatus 17 and hydrogen is separated from it at unit 18. Liquid fuel ammonia is heated, gaseous fuel ammonia is evaporated and superheated, mixed with gas blow-offs obtained by releasing hydrogen, and the resulting fuel gas is supplied together with heated air to the ammonia cracking reactor 4 for combustion. The flue gas outlet of the ammonia cracking reactor 4 is connected to the HEP, which uses the heat of the flue to heat the gaseous raw ammonia, as well as air and fuel gas in coils 8, 10 and 9, respectively. The heat of the flue gases is used to heat the liquid raw ammonia before the flue gas exits the HEP in coil 12. The pressure of the used flue gases is increased, cooled and condensed distilled water is separated from them in separator 22. Dehydrated flue gases are released into the atmosphere. Evaporation and overheating of raw ammonia is carried out in corresponding recuperative heat exchangers 2 and 3. Evaporation and overheating of fuel ammonia is carried out in other corresponding recuperative heat exchangers 13 and 14 using a coolant that is heated by the heat of flue gases in coil 11. A plant for producing hydrogen from ammonia has also been proposed.

EFFECT: obtaining an additional product from flue gases - distilled water by ensuring cooling of the exhaust flue gases in the heat-energized equipment plant to a temperature of about 60°C, improving the energy efficiency of the plant.

12 cl, 1 dwg