Ammonia-Hydrogen Engine Ignition for Stable Mixed Combustion
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Solution Overview
Problem
Conventional ammonia mixed combustion engines face challenges in maintaining combustion stability and improving exhaust gas properties as the mixed combustion ratio increases, leading to issues like premature ignition and increased NH3 and N2O emissions.
Innovation Solution
An engine device that compresses an air-fuel mixture of ammonia and hydrogen in the combustion chamber, then ignites it using an auxiliary fuel injection system to control ignition timing and prevent spontaneous combustion, while utilizing catalysts to treat exhaust gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the amount of supplied ammonia is increased to achieve higher mixed combustion ratio, then the proportion of ammonia fuel is improved, but the combustion stability is lowered and exhaust gas properties are deteriorated
Solution Approach 1:
Hydrogen is introduced as an intermediary substance to facilitate ammonia combustion. The hydrogen supply means supplies hydrogen to the combustion chamber, where it acts as a mediator that enables more stable combustion of higher proportions of ammonia, thereby resolving the contradiction between increasing ammonia quantity and maintaining combustion stability.
Solution Approach 2:
The invention changes the chemical composition parameters of the fuel mixture by introducing hydrogen alongside ammonia. By adjusting the ratio and supply timing of hydrogen and ammonia, the system maintains combustion stability even when ammonia proportion increases, thus resolving the contradiction between quantity increase and stability maintenance.
2Quantity of substance
If the amount of supplied ammonia is increased to achieve higher mixed combustion ratio, then the proportion of ammonia fuel is improved, but the exhaust gas properties are deteriorated with increased NH3 and N2O emissions
Solution Approach 1:
Hydrogen serves as an intermediary that modifies the combustion process of ammonia. By controlling hydrogen supply timing and amount, the combustion characteristics are improved, leading to more complete combustion and reduced harmful emissions like NH3 and N2O, thus resolving the contradiction between ammonia quantity and exhaust gas quality.
3Reliability
If non-ammonia fuel is directly injected to ignite the air-fuel mixture, then the ignition ability is improved, but when hydrogen is mixed excessively the ignition timing becomes too advanced causing premature ignition
Solution Approach 1:
The invention dynamically adjusts the supply timing of hydrogen based on the mixed combustion ratio. As the ammonia proportion increases, the hydrogen supply timing is retarded to prevent premature ignition, while still maintaining sufficient ignition ability. This dynamic adjustment resolves the contradiction between ensuring ignition capability and preventing harmful premature ignition.
4Object-generated harmful factors
If the timing of supplying liquid fuel is controlled to be slower than ammonia supply timing, then the exhaust gas properties are improved, but the combustion stability is lowered when high mixed combustion ratio is used
Solution Approach 1:
The invention dynamically adjusts the liquid fuel supply timing based on the mixed combustion ratio. When ammonia proportion is low, fuel timing is retarded to improve exhaust properties; when ammonia proportion increases, fuel timing is advanced to maintain combustion stability. This dynamic control resolves the contradiction between exhaust gas quality and combustion stability.
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 ignition and combustion stability, reduces premature ignition, and improves exhaust gas quality by controlling the ignition timing and hydrogen proportion, thereby stabilizing the combustion process.
Implementation Method 1
the air-fuel mixture is compressed in the combustion chamber to raise the temperature and pressure of the air-fuel mixture
Implementation Method 2
the air-fuel mixture in the combustion chamber is ignited by an ignition device
Data Source
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AI summary
[Problem] Provided is an engine device which improves ability to ignite an air-fuel mixture containing ammonia and hydrogen and its slow combustion speed, and which can stably combust the air-fuel mixture with good exhaust gas properties. [Solution] An engine device 1 which is an ammonia mixed combustion engine device operated by the air-fuel mixture of at least ammonia and hydrogen being combusted in a combustion chamber 21a, supplies ammonia and hydrogen to the combustion chamber 21a to create the air-fuel mixture, compresses the air-fuel mixture in the combustion chamber 21a to raise the temperature and pressure of the air-fuel mixture, and in accordance with a state of the air-fuel mixture in the combustion chamber 21a, ignites the air-fuel mixture in the combustion chamber 21a by an ignition device composed of an auxiliary fuel supply device 6 and an auxiliary fuel injection part 26.