Method for operating a premix burner
AssigneeAsea Brown Boveri AG
InventorsAdnan Eroglu, Jaan Hellat, Jakob Keller, Robin McMillan, Roger Suter
Life of this patent
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Abstract
The object of the invention is to provide a method for operating a premix burner which has improved operational reliability and functioning during certain types of operation. In addition, it is intended to specify a corresponding premix burner for carrying out the method. According to the invention, this is achieved by the fact that at least one liquid fuel (2) is injected into the inner chamber (9) of the premix burner (4) in a plain jet (26, 26′) with an injection angle α of less than 10°. For this purpose, the liquid-fuel nozzle (17) has a simple injection opening (19) with a guide length (1) and with a diameter (d).
Claims9
A premix burner comprising:
- at least two hollow part-cone bodies arranged radially offset with respect to one another, said hollow part-cone bodies together defining a hollow-cone-shaped inner chamber which increases in size in the direction of flow;
- tangential air-inlet slots;
- a liquid-fuel nozzle which opens centrally into the inner chamber;
- a fuel lance in fluid communication with the liquid-fuel nozzle for supplying fuel;
- wherein the liquid-fuel nozzle has a simple injection opening with a guide length (l) and with a diameter (d), the injection opening having a guide length (l) to diameter (d) ratio of 4≦l/d≦6.
A method for operating a premix burner having a liquid-fuel nozzle which opens centrally into an inner chamber of the premix burner the method comprising:
- injecting at least one liquid fuel into the inner chamber in a compact, non-auxiliary-medium atomized liquid fuel plain jet with an injection angle α of less than 10°;
- wherein said injecting step is performed in a premix burner comprising:
- at least two hollow part-cone bodies arranged radially offset with respect to one another, said hollow part-cone bodies together defining a hollow-cone-shaped inner chamber which increases in size in the direction of flow;
- tangential air-inlet slots;
- a liquid-fuel nozzle which opens centrally into the inner chamber;
- a fuel lance in fluid communication with the liquid-fuel nozzle for supplying fuel;
- wherein the liquid-fuel nozzle has an injection opening with a guide length (l) and with a diameter (d), the injection opening having a guide length (l) to diameter (d) ratio of 4≦l/d≦6.
Dependencies are inferred from the claim text.