Ammonia Engine Prechamber Ignition With On-Demand Hydrogen
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Solution Overview
Problem
Existing internal combustion engines face challenges in efficiently utilizing ammonia as a main fuel and achieving improved operability and efficiency, particularly in generating electric power.
Innovation Solution
An internal combustion engine design incorporating a prechamber system with ammonia and hydrogen sources, controlled by a control device, to optimize combustion using a variable volume geometry and on-demand hydrogen production, along with a catalytic converter and turbocharger system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a prechamber system with on-demand hydrogen production is implemented, then combustion efficiency and operability are improved, but device complexity increases
Solution Approach 1:
The combustion system is divided into two separate chambers: a prechamber for hydrogen combustion and a main combustion chamber for ammonia combustion. This segmentation allows each chamber to be optimized for its specific fuel type, improving overall combustion efficiency while managing system complexity through modular design.
Solution Approach 2:
Hydrogen acts as an intermediary substance that is produced on-demand from ammonia via reforming. This intermediary enables the prechamber to provide reliable ignition and combustion promotion without requiring direct ammonia combustion in the prechamber, thereby improving reliability while controlling complexity through chemical mediation.
2Reliability
If hydrogen is added to the combustion charge to promote combustion, then ignition reliability is improved, but loss of substance increases
Solution Approach 1:
The hydrogen injection system is made dynamic and controllable, with sensors monitoring combustion conditions and a control device adjusting hydrogen injection amounts in real-time. This dynamic control ensures hydrogen is added only when and where needed for ignition promotion, improving reliability while minimizing unnecessary hydrogen consumption and associated losses.
Solution Approach 2:
The system changes the concentration parameter of hydrogen in the combustion charge based on operating conditions. By adjusting the hydrogen-to-ammonia ratio dynamically, the system optimizes ignition reliability while reducing excess hydrogen that would otherwise be lost or require additional handling.
3Adaptability or versatility
If a reformer is used for on-demand hydrogen production, then adaptability is improved, but device complexity increases
Solution Approach 1:
The reformer system is designed to be multi-functional, producing hydrogen on-demand from ammonia based on varying operating conditions. This universal approach allows the same reformer to handle different load requirements and fuel conditions, improving adaptability while managing complexity through integrated design.
Solution Approach 2:
The reformer system is integrated into the existing ammonia supply infrastructure, using the ammonia fuel source itself to produce the required hydrogen. This self-service approach eliminates the need for separate hydrogen storage and production systems, improving adaptability to different operating conditions while reducing overall system complexity through internal utilization.
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 the operability and efficiency of ammonia combustion, allowing for higher brake mean effective pressure and improved electric power generation, with reduced emissions and optimized combustion control.
Implementation Method 1
at least one reformer for cracking ammonia
Implementation Method 2
an ignition device arranged in the prechamber to start combustion of the combustion charge indirectly via flame torches
Data Source
AI summary
An internal combustion engine includes an intake manifold, at least one cylinder head with a plurality of piston-cylinder-units, at least one ammonia source, and at least one hydrogen source. Each piston-cylinder-unit includes at least a main combustion chamber, at least one intake valve, a prechamber coupled to the main combustion chamber, and an ignition device in the prechamber. The at least one ammonia source is configured to provide ammonia to each piston-cylinder unit. The at least one hydrogen source is configured to provide hydrogen to each prechamber, wherein the at least one hydrogen source includes at least one reformer for cracking ammonia.