Sequential Fuel Gas Injector Valve Closure
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Solution Overview
Problem
In conventional fuel gas injector arrangements, residual fuel gas is not effectively combusted after the nozzle valve closure, leading to unburned fuel remaining in the combustion chamber.
Innovation Solution
A fuel gas injector arrangement where fuel gas nozzle valve members are controlled to close one after the other with a predetermined time offset, utilizing combustion chamber swirl to transport and ignite residual gas clouds at the burn-off location of the next closing valve member, ensuring complete combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fuel gas nozzle valve members are closed simultaneously after fuel gas injection, then the injection process is simple and fast, but residual fuel gas stands still and is not combusted effectively
Solution Approach 1:
The patent divides the single closing action into multiple sequential closing actions. Instead of closing all nozzle valve members simultaneously, they are closed one after another in a predetermined sequence with time offsets. This segmentation allows residual gas from earlier-closing valves to be transported by swirl flow to later-closing valve locations where it can be ignited and combusted, thereby improving combustion efficiency without requiring complex additional hardware.
Solution Approach 2:
The patent applies preliminary action by closing valve members in a predetermined sequence before the injection event fully completes. The first valve member is closed during the injection event, and subsequent valve members are closed in sequence with time offsets, allowing residual gas to be transported and combusted. This preliminary sequential closing ensures that combustion continues effectively after the main injection completes.
2Loss of substance
If fuel gas is blown into combustion chamber at high pressure to minimize unburned fuel, then combustion efficiency improves, but residual gas stands still quickly after nozzle closure and cannot be fed to combustion
Solution Approach 1:
The patent implements periodic action through the sequential closing of nozzle valve members with predetermined time offsets. Each valve member closes at a different time during the injection event, creating a periodic pattern of valve closure. This timing sequence ensures that residual gas from earlier closures is continuously transported by swirl flow and combusted at subsequent valve locations, extending the effective combustion duration and reducing unburned fuel loss.
3Quantity of substance
If multiple fuel gas nozzle valve members are used distributed over circumference, then fuel gas distribution improves, but simultaneous closure leaves residual gas uncombusted
Solution Approach 1:
The patent segments the closure timing of multiple circumferentially distributed valve members. Instead of closing them simultaneously, each valve member closes in sequence with predetermined time offsets. This segmentation maintains the beneficial fuel gas distribution from multiple valves while enabling residual gas from earlier-closing valves to be transported by swirl flow to later-closing valve locations for combustion, thus resolving the contradiction between distribution and combustion efficiency.
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 approach significantly reduces unburned fuel gas by ensuring residual gas is ignited during the same fuel injection event, improving combustion efficiency compared to prior art.
Implementation Method 1
residual gas clouds or clouds (in a combustion chamber) to ignite at the fuel gas burn-off location of another, still openly controlled fuel gas nozzle valve member
Data Source
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AI summary
The invention relates to a combustion gas injector assembly (1) comprising a combustion gas injector (3) having groups (11a,b,c) of combustion gas nozzle openings distributed around the periphery, each group having at least one combustion gas nozzle opening (13), a combustion gas nozzle valve member (9a,b,c) of the combustion gas injector (3), which member can be controlled in the open position and closed position, is associated with each group (11a,b,c) of combustion gas nozzle openings, in order to selectively discharge the combustion gas via the at least one combustion gas nozzle opening (13). The combustion gas injector assembly (1) is configured to control the combustion gas nozzle valve members (9a,b,c) successively with a predetermined time offset (T) into the closed position.