Zeta Potential Tuning for Coke Mitigation in Fuel Systems
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Solution Overview
Problem
Gas turbine engines experience carbonaceous deposit formation on surfaces contacting hydrocarbon fluids at elevated temperatures, leading to reduced performance, increased pressure drops, and material erosion, necessitating expensive de-coking procedures and nozzle replacements.
Innovation Solution
Chemical tuning of surface potential or zeta potential of components in contact with hydrocarbon fluids to selectively attract or repel coke-catalyzing materials and precursors, using materials like cobalt-chrome alloys and functionalization with groups such as carboxyl or amine to create surfaces that electrostatically attract or repel charged species, preventing coke deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surfaces are used in gas turbine engines contacting hydrocarbon fluids at elevated temperatures, then the engine can operate, but carbonaceous deposits (coke) form on surfaces leading to reduced performance and increased pressure drops
Solution Approach 1:
The patent applies parameter changes by modifying the zeta potential of surfaces through chemical functionalization. Surfaces are treated with compounds containing functional groups (carboxyl, hydroxyl, amine, etc.) that alter the surface charge characteristics. This changes the electrostatic parameters of the surface, enabling selective attraction or repulsion of coke precursors and catalytic materials, thereby preventing coke deposition while maintaining engine performance.
2Object-generated harmful factors
If surfaces are functionalized to attract coke-catalyzing materials, then coke formation is prevented, but the surface chemistry becomes more complex
Solution Approach 1:
The patent applies local quality by introducing functional groups at specific locations on the surface rather than uniformly modifying the entire surface. The surface functionalization is localized to create regions with specific zeta potentials that selectively interact with coke precursors. This localized approach prevents coke formation at critical surfaces while maintaining the simplicity of other engine components.
3Reliability
If de-coking procedures are performed to remove deposits, then surface performance is restored, but expensive maintenance procedures are required
Solution Approach 1:
The patent applies preliminary action by preventing coke deposition in the first place through zeta potential modification of surfaces. Instead of allowing coke to form and then requiring expensive de-coking procedures, the functionalized surfaces proactively prevent coke accumulation. This eliminates the need for periodic maintenance interventions, restoring surface performance continuously without costly repair operations.
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
Effectively mitigates coke formation and deposition, preventing performance degradation and material erosion, while allowing for durable operation over a wide temperature range and various hydrocarbon fluid compositions.
Implementation Method 1
the contact surface selectively attracts or repels at least one of coke-catalyzing materials, metal ions, heteroatomic hydrocarbons, or coke precursors
Implementation Method 2
Chemical tuning of surface potential or zeta potential of components in contact with hydrocarbon fluids to selectively attract or repel coke-catalyzing materials and precursors
Data Source
AI summary
A component and a system for mitigating coke formation during delivery of a hydrocarbon fluid. The component includes a contact surface configured to be in contact with the hydrocarbon fluid. Tuning the zeta potential of the contact surface allows selective attraction and/or repulsion of coke-catalyzing materials, metal ions, heteroatomic hydrocarbons, and/or coke precursors present in the hydrocarbon fluid. A method of mitigating coke formation during delivery of a hydrocarbon fluid includes tuning a zeta potential of the contact surface of the component and injecting or circulating the hydrocarbon fluid through the system such that the contact surface selectively attracts and/or repels coke-catalyzing materials, metal ions, heteroatomic hydrocarbons, and/or coke precursors present in the hydrocarbon fluid.