
Research on jets for hydrogen use in iron ore pellet mills
The project Fossil-free combustion in grate-kiln pellet plant using co-jet burners is financed by Swedish Mining Innovation and is about investigating the possibility of replacing fossil fuels with hydrogen in LKAB's kiln.
day, the grate-kiln pellet process is dependent on a 50 MW burner producing a long flame that generates heat throughout the kiln and to previous process steps.
"In a hydrogen flame, the properties are controlled by the mixture between fuel and oxygen, and to create a long flame, a high inlet velocity must be combined with slow mixing", says Sofia Larsson.
The task is complicated by the large quantities of hot process gas supplied to the wedge through complex ducts, resulting in a flow field with significant influence on fuel flow and the mixing process in general and flame shape and stability in particular.
"The purpose of the project is therefore to develop techniques to control the properties of the gas flame through a so-called co-jet burner. Activities include a systematic numerical and experimental study of the key factors governing the flow field and mixing process and how they link to flame properties."
The Grate Kiln is one of LKAB's two different types of iron ore pellet plant where the pellets are burned in a large rotating furnace (kiln). In the kiln, there is a burner that supplies the process with the necessary heat. The fuel is supplied in a (jet) jet and must be mixed with the surrounding air to burn, and what we are investigating is whether you can delay the mixing of air and fuel by having an extra jet around the fuel jet itself. The additional jet shares the main axis with the burner jet and this means that it is coaxial (coaxial abbreviated co = co-jet).
Contact
Sofia Larsson
- Associate Professor
- 0920-492421
- sofia.larsson@ltu.se
- Sofia Larsson
Martin Östman
- Doctoral Student
- 0920-491303
- martin.ostman@ltu.se
- Martin Östman
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