Tapering Injection Component for Premixed Dual Fuel Burner
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Solution Overview
Problem
In dual fuel turbomachine burners, the discharge of liquid fuel at the burner head interferes with swirl generation, causing aerodynamic disturbances and leading to clogging and undesirable recirculation zones within the premixing section, which reduces efficiency and can result in overheating and damage to components.
Innovation Solution
A premixed dual fuel burner design featuring a tapering injection component that directs liquid fuel towards the combustion chamber, minimizing aerodynamic disturbances and ensuring the recirculation zone forms within the combustion chamber rather than the premixing section, thus preventing clogging and maintaining efficient swirl generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If main liquid fuel is discharged at the burner head, then fuel delivery is achieved, but aerodynamic disturbances interfere with swirl generation and cause clogging
Solution Approach 1:
The liquid fuel discharge function is extracted from the burner head and relocated to a separate injection component positioned within the burner interior. This separates the fuel delivery function from the swirl generation zone, eliminating the harmful aerodynamic disturbances caused by discharge at the burner head while maintaining effective fuel delivery.
Solution Approach 2:
A tapering injection component serves as an intermediary element between the fuel supply and the combustion chamber. This component guides the liquid fuel stream along a controlled path, preventing direct discharge into the swirl zone and avoiding clogging of the premixing section while ensuring proper fuel atomization and mixing.
2Loss of time
If liquid fuel is discharged before the swirler, then fuel injection timing is achieved, but fuel deposition on swirler and premixing section walls occurs
Solution Approach 1:
The fuel injection function is extracted from the pre-swirler timing position and relocated to the injection component within the burner interior. This maintains appropriate injection timing while preventing fuel contact with the swirler and premixing section walls that causes deposition and clogging.
Solution Approach 2:
The injection component introduces fuel into the burner interior at a position and orientation that directs the fuel stream away from the walls of the swirler and premixing section. By changing the spatial dimension of fuel introduction, the system achieves proper timing without wall deposition.
3Stability of the object's composition
If recirculation zones form within burner interiors, then combustion mixing occurs, but overheating and damage to components result
Solution Approach 1:
The recirculation zone formation is extracted from the burner interior (specifically the premixing section) and relocated to occur within the combustion chamber. This maintains the necessary combustion mixing function while removing the harmful thermal effects from the burner components.
Solution Approach 2:
The injection component acts as an intermediary that controls flow patterns to prevent recirculation zone formation within the burner interior. By directing the fuel stream and controlling mixing dynamics, the component ensures recirculation occurs only in the combustion chamber where it is thermally safe.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances combustion efficiency, extends the operational life of burner components, and stabilizes combustion by controlling recirculation zone formation, preventing overheating and maintaining proper fuel premixing action.
Implementation Method 1
discharging of the main liquid fuel at the burner head interferes with the swirl generation performed by the swirler by increasing the aerodynamic disturbances inside the swirler
Implementation Method 2
the air from the compressor is mixed with the main gaseous fuel, either inside the swirler or just before introduction into the swirler, and then swirled by the swirler to create a swirling flow
Implementation Method 3
the air from the compressor is mixed with the main gaseous fuel... before igniting the combustion mixture, i.e. mixture of the air from the compressor and the main fuel, in the combustion chamber
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
A premixed dual fuel burner includes a burner head, a burner interior elongated along a main axis and having an upstream side enclosed by a swirler and a downstream side enclosed by a premixing section, and an injection component. The burner head, the upstream side and the downstream side are serially arranged. The swirler includes an inlet section for introducing air and a main gas fuel into the burner interior. The injection component has a tapering structure positioned along the main axis. The tapering structure extends from the burner head into the burner interior. The injection component has a burner head side and an injection side and tapers from the burner head side to the injection side along the main axis. At the injection side a liquid fuel outlet is present for introducing a main liquid fuel into the burner interior. The injection side is disposed in the burner interior. At least one of the at least one liquid fuel outlet is at a side – i.e. a side face of the tapering - of the injection side of the injection component.