Fuel Injector Tip Cooling via Annular Recess
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Solution Overview
Problem
Fuel injectors in gasifiers face premature degradation due to high temperatures and thermal stress caused by the proximity of flames and heat from reactions, which existing cooling techniques are unable to adequately address, leading to radial and circumferential cracking.
Innovation Solution
The implementation of an annular recess in the fuel injector tip, which reduces the temperature gradient by decreasing the distance between the coolant chamber and the injector tip face, and separates the maximum thermal and mechanical stress points, along with the use of sacrificial or filling materials to manage heat transfer during extreme conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing cooling techniques are used, then cooling is provided to the fuel injector, but the cooling is insufficient to prevent premature degradation and cracking
Solution Approach 1:
The patent applies local quality by creating an annular recess specifically at the tip region where thermal stress is most severe. This recess modifies the local geometry to reduce the temperature gradient between the coolant chamber and the outer surface, providing targeted cooling enhancement exactly where needed rather than uniformly throughout the entire injector body.
Solution Approach 2:
The patent introduces a geometric dimensionality change by adding an annular recess that creates a stepped configuration. This multi-level geometry allows the coolant chamber to be positioned closer to the critical tip region in terms of thermal pathway, effectively reducing the thermal resistance without increasing the overall injector length.
2Temperature
If the fuel injector tip is cooled more aggressively, then thermal stress is reduced, but the temperature gradient may cause thermal shock and cracking
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the tip region through the annular recess. This changes the thermal conductivity pathway and reduces the temperature gradient parameter, allowing for more aggressive cooling while maintaining structural integrity by preventing thermal shock.
3Productivity
If the fuel injector operates in high-temperature environments, then gasification efficiency is maintained, but the injector experiences radial and circumferential cracking
Solution Approach 1:
The patent applies segmentation by dividing the tip region into distinct geometric zones using the annular recess. This creates separate thermal management zones that allow the inner coolant chamber region to be cooled aggressively while the outer regions maintain structural integrity, preventing cracking while maintaining operational efficiency.
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 extends the life of fuel injectors by minimizing thermal stress and preventing cracking, allowing for more efficient and durable operation in high-temperature environments.
Implementation Method 1
an annular tip portion disposed about an injection flow path, an annular coolant chamber disposed in the annular tip portion
Data Source
AI summary
According to various embodiments, a system includes a gasification fuel injector. The gasification fuel injector includes a tip portion, an annular coolant chamber disposed in the tip portion, a recessed surface for cooling control and a first structural support extending through the annular coolant chamber. The first structural support divides the annular coolant chamber into a first passage and a second passage.