Yara Glomfjord is the northernmost fertiliser production site in the world, located some 30 km north of Arctic Circle in Norway. Its first nitric acid plant, in operation since 1955, is of Yara’s inhouse design and went through a large number of expansions and improvements throughout the decades. The design capacity of the dual pressure, atmospheric combustion plant was 200 t/d. This has been increased up to 660 t/d by installing additional burners and machine train, cooler condensers, absorption volume increase and an improved ammonia to air ratio. A particularly effective improvement of the production capacity was the addition of pure oxygen to the inlet of process gas compressor. Sound environmental performance of the plant is possible thanks to efficient N2O and NOx abatement, as well as robust waste heat recovery.
This presentation describes the history of one of the oldest nitric acid plants in the world, including the concept of oxygen addition in general, current developments, as well as an outline of further improvements for the future.