Large-Engine Fuel Injector Purging for Residual Methanol Removal
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Solution Overview
Problem
Renewable fuels like methanol cause corrosion and pose health hazards in fuel distribution and injection systems of large engines, necessitating reliable and safe operation with such fuels.
Innovation Solution
A fuel injector design with a purge line and purge valve system, utilizing a hydraulic actuated poppet valve and lubrication mechanism to safely remove residual fuel, particularly methanol, from the pressure chamber and high-pressure fuel ducts, ensuring compactness and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If renewable fuels like methanol are used in large engines, then alternative to fossil fuels is achieved, but corrosion and health hazards occur in fuel distribution and injection systems
Solution Approach 1:
The purge line and purge valve are designed to proactively remove residual methanol from the injection system before it can cause corrosion or health hazards. The system performs preliminary purging operations after fuel injection to ensure complete removal of harmful residues.
Solution Approach 2:
A purge fluid is introduced as an intermediary substance to facilitate the removal of methanol from the injection system. The purge fluid flows through the purge line to displace and remove residual fuel, preventing direct contact between methanol and system components.
2Reliability
If a purge line and purge valve system is added to remove residual fuel, then safety and corrosion prevention is improved, but device complexity increases
Solution Approach 1:
The purge valve is designed to serve multiple functions: it controls the purging operation, regulates purge fluid flow, and can be integrated with existing fuel system components. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The purge line is integrated within the existing fuel injection system structure, nesting the purging function within the broader system architecture. The purge valve is positioned to work in conjunction with existing components, minimizing additional spatial requirements.
3Object-affected harmful factors
If methanol is removed from the injection system, then health hazards are reduced, but complete removal requires additional purging operations
Solution Approach 1:
The purge valve and purge line are designed to enable continuous or repeated purging operations to ensure complete methanol removal. The system can perform multiple sequential purging cycles until residual fuel is eliminated, maintaining continuous action rather than single-time intervention.
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
Facilitates safe and efficient removal of residual methanol, preventing corrosion and health hazards, while maintaining operational safety and reducing maintenance risks.
Implementation Method 1
A purge fluid is supplied to the high-pressure fuel duct, flows through the high-pressure fuel duct, thereby purging the high-pressure fuel duct
Implementation Method 2
A hydraulic fluid is supplied to the hydraulic pipe, which is configured for acting upon the purge piston with a view to opening the fluid communication
Implementation Method 3
A lubricant is supplied to the spring chamber, wherein the spring chamber is configured to receive the lubricant
Data Source
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AI summary
A fuel injector for injecting a fuel into a combustion chamber of a large engine is proposed, comprising a nozzle holder (2) and a nozzle tip (3) having at least one spray hole (31), through which the fuel can be injected into the combustion chamber (100), further comprising a pressure chamber (4) and at least one high-pressure fuel duct (5), through which the fuel can be introduced into the pressure chamber (4) at a high pressure, a valve needle (6) loaded with a spring (7) and interacting with a valve seat (8) for opening and closing a fluid connection between the pressure chamber (4) and the nozzle tip (3). A purge line (9) is arranged in the nozzle holder (2), wherein the purge line (9) extends from the pressure chamber (4) to a discharge passage (20) configured for discharging fluid from the nozzle holder (2), and wherein a purge valve (10) is provided which is configured for opening and closing a fluid communication through the purge line (9). Furthermore, a large engine comprising such a fuel injector as well a method for operating such a large engine are proposed.