Pre-Chamber Gas Engine Ignition for Flame-Retardant Fuels
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Solution Overview
Problem
When fuels with flame retardancy are used in gas engines, insufficient combustion in the combustion chamber can lead to low in-cylinder pressure, necessitating a solution to promote combustion.
Innovation Solution
A gas engine design featuring a combustion chamber with a first sub-chamber and a second sub-chamber, connected via communication holes, and an ignition device in the second sub-chamber, along with an injection hole for gas introduction, which can be positioned to intersect the communication hole axis, and optionally includes a check valve in the supply channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a fuel having flame retardancy (e.g., ammonia) is used to suppress CO2 emission, then environmental performance is improved, but combustion in the combustion chamber becomes insufficient leading to low in-cylinder pressure
Solution Approach 1:
The combustion chamber is divided into a first sub-chamber and a second sub-chamber with different functions. The first sub-chamber handles main combustion, while the second sub-chamber serves as a pre-combustion chamber to generate high-temperature gas that promotes combustion in the first sub-chamber, thereby resolving the insufficient combustion problem while maintaining the use of flame-retardant fuels
Solution Approach 2:
Combustion is initiated in the second sub-chamber before the main combustion chamber. The ignition device ignites the fuel-air mixture in the second sub-chamber first, generating high-temperature gas that then enters the first sub-chamber to promote combustion, ensuring sufficient combustion even with flame-retardant fuels
2Object-generated harmful factors
If a fuel having flame retardancy is used, then emission performance is improved, but combustion promotion becomes difficult requiring additional combustion assistance
Solution Approach 1:
The combustion chamber is segmented into two sub-chambers with distinct functions. The second sub-chamber acts as a pre-combustion chamber that generates high-temperature gas to assist combustion in the first sub-chamber, providing combustion promotion capability without requiring external assistance devices
Solution Approach 2:
The second sub-chamber serves multiple functions: it acts as a pre-combustion chamber to generate high-temperature gas, provides a controlled environment for ignition, and facilitates gas exchange between chambers through communication holes. This multi-functionality reduces the need for additional combustion assistance devices
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
This configuration accelerates combustion in the second sub-chamber, stabilizes ignition conditions, and promotes combustion in the main combustion chamber, enhancing combustion efficiency.
Implementation Method 1
an ignition device provided in the second sub-chamber
Implementation Method 2
an injection hole through which a gas is allowed to be injected into the second sub-chamber
Implementation Method 3
a check valve may be provided in the supply channel so as to restrict a flow of the gas to a direction from the supply source toward the injection hole
Data Source
Figure 1
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Figure 3
AI summary
Provided is a gas engine, including: a combustion chamber (108); a first sub-chamber (202) that is in communication with the combustion chamber (108) via a first communication hole (202b); a second sub-chamber (204) that is in communication with the first sub-chamber (202) via a second communication hole (204b), and has a volume smaller than a volume of the first sub-chamber (202); an ignition device (206) provided in the second sub-chamber (204); and an injection hole (208) through which a gas is allowed to be injected into the second sub-chamber (204).