Multi-Fuel Engine Combustion With Heat-Absorbing Diluent Control
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Solution Overview
Problem
Internal combustion engines face challenges in achieving efficient combustion with fuels that have high heat of vaporization, poor mixing, and low flame speed, leading to suboptimal engine performance and emissions.
Innovation Solution
A multi-fuel engine system that adjusts the substitution ratio of different fuels, such as diesel and hydrogen, and ammonia, to optimize combustion conditions, including using a non-fuel mass to absorb heat and maintain higher substitution ratios across varying engine loads and conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If higher substitution ratios of lower or zero-carbon fuels are used, then emissions are reduced, but combustion conditions deteriorate due to high heat of vaporization, poor mixing, and low flame speed
Solution Approach 1:
A non-fuel mass (such as nitrogen or inert gas) is introduced as an intermediary substance to absorb excess heat from the combustion process. This mediator prevents overheating that would otherwise occur with higher substitution ratios of fuels like hydrogen or ammonia, enabling improved emissions performance while maintaining stable combustion conditions.
Solution Approach 2:
The system dynamically adjusts the non-fuel mass flow rate based on operating conditions and substitution ratio. By changing the parameters of the combustion environment (temperature, pressure, composition) through controlled addition of non-fuel mass, the system optimizes combustion stability while achieving lower emissions with higher proportions of clean fuels.
2Reliability
If the non-fuel mass flow rate is increased to maintain combustion stability, then combustion conditions are stabilized, but engine power output decreases
Solution Approach 1:
The non-fuel mass flow rate is dynamically adjusted based on real-time operating conditions including engine load, speed, and substitution ratio. During high-load conditions where power is prioritized, the non-fuel mass flow is reduced. During transient or low-load conditions where stability is critical, the flow is increased. This dynamic control resolves the contradiction between stability and power output.
Solution Approach 2:
The system changes operational parameters by adjusting the non-fuel mass flow rate according to the desired operating point. When maximum power is required, parameters are set to minimize non-fuel mass addition. When combustion stability is the priority, parameters are adjusted to increase non-fuel mass flow, thereby optimizing the trade-off between power and 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
The system enhances engine efficiency, reduces emissions, and allows for higher substitution ratios of lower or zero-carbon fuels, thereby improving overall engine performance and environmental impact.
Implementation Method 1
using a non-fuel mass to absorb heat and maintain higher substitution ratios
Data Source
AI summary
Methods and systems are provided for a multi-fuel engine. In one example, a method includes operating engines of rail vehicles at a desired substitution ratio to recharge an energy storage device of a rail vehicle operating in an all-electric mode to meet a requested total power.