Ammonia Fuel Delivery with Cracking for Turbine Combustor Flexibility
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Solution Overview
Problem
Existing fuel systems for powerplants, particularly those using ammonia, require improvements in efficiency and flexibility during startup and steady-state operations.
Innovation Solution
A fuel system that includes a first fuel source to crack ammonia into hydrogen and nitrogen gases, and a second fuel source for additional hydrogen, with control valves and a metering valve to manage fuel delivery during different operating modes, enabling efficient combustion in turbine engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single fuel source is used in the fuel system, then the device complexity is reduced, but the adaptability and flexibility during different operating modes (startup and steady-state) deteriorates
Solution Approach 1:
The fuel system is segmented into multiple independent fuel sources (ammonia fuel source and hydrogen fuel source) with separate control valves and metering mechanisms. This segmentation allows each fuel source to be independently activated based on operating mode, providing flexibility while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The fuel system incorporates dynamic control mechanisms including control valves and metering valves that can dynamically adjust fuel flow based on operating conditions. The system transitions from static single-fuel operation to dynamic multi-fuel operation, enabling optimization of combustion efficiency during startup and steady-state phases.
2Ease of manufacture
If ammonia is used as fuel without cracking, then the fuel storage and handling is simplified, but the combustion efficiency and compatibility with existing engine systems deteriorates
Solution Approach 1:
The system performs preliminary cracking of ammonia molecules into hydrogen and nitrogen before the fuel reaches the combustor. This preliminary chemical processing action transforms ammonia into a more combustion-efficient form (hydrogen), resolving the contradiction between simple ammonia storage and efficient combustion.
Solution Approach 2:
A cracking reactor is introduced as an intermediary component between the ammonia storage and the combustor. This intermediary device facilitates the chemical transformation of ammonia into hydrogen, enabling both the simplicity of ammonia storage and the efficiency of hydrogen combustion.
3Measurement precision
If a metering valve is added to control fuel flow during different operating modes, then the adaptability and control precision are improved, but the device complexity increases
Solution Approach 1:
The metering valve is designed with multi-functionality, serving both as a flow control device and a measurement device. It can precisely meter fuel flow during startup mode and steady-state operation, providing adaptability while minimizing additional complexity through a single multi-functional component.
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
Enhances combustion efficiency by providing flexible fuel options, optimizing startup and steady-state operations, and improving overall performance of powerplants.
Implementation Method 1
The first fuel source is configured to crack ammonia into hydrogen gas and nitrogen gas
Implementation Method 2
a combustor section, a turbine section... The fuel system is configured to deliver at least one of a first fuel or a second fuel to the combustor section
Data Source
AI summary
A fuel system is configured to deliver a first fuel and/or a second fuel to a combustor section. The fuel system includes a first fuel source, a second fuel source, a first control valve, a second control valve, a metering valve and a fuel injector. The first fuel source is configured to crack ammonia into hydrogen gas and nitrogen gas and subsequently output the first fuel. The second fuel source is configured to output the second fuel. The metering valve is configured to meter a flow of the first fuel received from the first fuel source through the first control valve to the fuel injector during a first operating mode. The metering valve is configured to meter a flow of the second fuel received from the second fuel source through the second control valve to the fuel injector during a second operating mode.