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US 2002/0177093 A1Published application
Method for injecting fuel into a burner
AssigneeALSTOM Technology Ltd
InventorsChristian Oliver Paschereit, Peter Flohr
Life of this patent
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AssigneeALSTOM Technology Ltd
InventorsChristian Oliver Paschereit, Peter Flohr
Estimating the term…
In a method for injecting fuel into a burner (1), which burner (1) comprises an inner chamber (22) enclosed by at least one shell (8, 9), at which inner chamber fuel is injected through fuel nozzles (6) into a combustion air stream (23) flowing inside the inner chamber (22), the resulting fuel/air mixture flows within a time-lag (τ) to a flame front (3) in a combustion chamber (2), and is ignited there, the formation of thermoacoustic, ignition-driven vibrations is achieved in that the fuel is injected in such a way by means of fuel nozzles (6) distributed over the burner length that the time-lag (τ) between the injection of the fuel and its combustion at the flame front (3) corresponds to a distribution (12) that varies systematically over the burner length for the various fuel nozzles and reduces the vibrations.
Method for injecting fuel into a burner (1), which burner (1) comprises an inner chamber (22) enclosed by at least one shell (8, 9), at which inner chamber fuel is injected by way of fuel nozzles (6) into a combustion air stream (23) flowing inside the inner chamber (22), the resulting fuel/air mixture flows within a time-lag (τ) to a flame front (3) in a combustion chamber (2), and is ignited there, characterized in that the fuel is injected in such a way by means of fuel nozzles (6) distributed over the burner length that the time-lag (τ) between the injection of the fuel and its combustion at the flame front (3) for the various fuel nozzles corresponds to a distribution (12) that varies systematically over the burner length and avoids ignition-driven fluctuations.
Method as claimed in one of the above claims, characterized in that the fuel is injected in such a way that the time-lag distribution (12) over the burner length towards the burner end (10) is designed so as to decrease in an essentially linear manner from the maximum value τmax by a maximum time-lag differential (Δτ) to a minimum value at the burner end (10) of τmax−Δτ.
Method as claimed in one of the above claims, characterized in that the burner (1) is a double cone burner, in which the burner (1) is made up of at least two superimposed, hollow partial cone bodies (8, 9) that are provided in the flow direction with an increasing cone angle, and which partial cone bodies (8, 9) are arranged offset in relation to each other so that the combustion air (23) flows through a gap (7) between the partial cone bodies (8, 9) into the inner chamber (22).
Dependencies are inferred from the claim text.