Patent ID: 11905172
Assignee: YARA INTERNATIONAL ASA
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  F  Y | IPC B  C  F

Claim 16:
17. A system for producing nitric acid configured for executing a process according to claim 2 comprising:
an ammonia burner, comprising a catalyst configured for catalytically combusting a combustion mixture comprising ammonia and air and/or oxygen at an elevated pressure;
an oxygen supply line in fluid connection with the ammonia burner, for providing an oxygen containing fluid to the ammonia burner;
an ammonia supply line, in fluid connection with the ammonia burner;
an ammonia combustion gas outlet line, for removing the ammonia combustion gas stream comprising nitric oxide from the ammonia burner, in fluid connection via an oxidizing section or oxidizer unit, configured for oxidizing the nitric oxide into nitrogen dioxide, to an absorber, for absorbing nitrogen dioxide in water, thereby yielding nitric acid;
wherein the oxygen supply line comprises an energy recovery system, wherein the energy recovery system comprises consecutively a means for pressurizing the oxygen containing fluid in the liquid state; one or more heaters configured for evaporating, and a first turbine configured for expanding the oxygen containing fluid in gaseous form, wherein an outlet of the turbine is in fluid connection with the ammonia burner; wherein the system further comprises
at least one of an electrolysis unit, an air liquefaction unit and an air separation unit, wherein the electrolysis unit is configured for decomposing water in H2 and O2 by means of an electrical current, wherein the air liquefaction unit is configured for converting gaseous air into liquid air, in fluid connection with the oxygen supply line; and wherein the air separation unit is configured for the separation of air into O2 and N2; and
wherein the first turbine is operationally coupled to a first generator, wherein said first generator is in electrical connection with the electrolysis unit and/or the air separation unit liquefaction unit.