Pre-Chamber Combustion System for Flare Gas Recovery
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Solution Overview
Problem
The burning or venting of flare gas from hydrocarbon production and other sources leads to significant pollution and greenhouse gas emissions, as existing technologies are inefficient in recovering and utilizing this waste gas effectively.
Innovation Solution
The implementation of a reciprocating engine with a combustion pre-chamber system that extends the rich operating limit by injecting air into the pre-chamber, creating a leaner fuel-air mixture that promotes rapid combustion and produces syngas with a desired H2/CO ratio, enabling the conversion of flare gas into valuable products like methanol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If flare gas is burned or vented directly, then greenhouse gas emissions and pollution occur, but the technology is simple and requires no complex recovery systems
Solution Approach 1:
The patent converts the harmful flare gas (waste product causing pollution) into a beneficial resource (syngas for methanol production) through partial oxidation in a reciprocating engine. The system transforms what was previously burned or vented into economically viable chemicals, turning an environmental problem into a profit center.
Solution Approach 2:
The system changes the operating parameters of the reciprocating engine to operate at extremely rich equivalence ratios (2.0-4.0), which is outside conventional operating ranges. This parameter change enables partial oxidation to produce syngas with controlled H2/CO ratios, converting waste gas into useful products while managing emissions.
2Manufacturing precision
If the engine operates at rich equivalence ratios to produce syngas, then the H2/CO ratio can be controlled, but the combustion stability deteriorates
Solution Approach 1:
The patent divides the combustion chamber into two distinct zones: a pre-chamber for stable ignition and a main chamber for syngas production. The pre-chamber operates at leaner conditions with better combustion stability, while the main chamber operates at rich conditions to achieve the desired H2/CO ratio. This segmentation allows both combustion stability and syngas composition control to be optimized independently.
Solution Approach 2:
The pre-chamber acts as an intermediary between the air-fuel mixture and the main combustion chamber. It conditions the mixture and provides stable ignition before the combustion products enter the main chamber, thereby stabilizing the overall combustion process while allowing the main chamber to operate at rich ratios for syngas production.
3Reliability
If air is injected into the pre-chamber to extend the rich operating limit, then combustion stability improves, but the device complexity increases
Solution Approach 1:
The air injection system is designed to be self-regulating, using pressure differential across a check valve to control air flow into the pre-chamber. The system automatically adjusts air injection based on operating conditions without requiring complex external control systems, thereby improving combustion stability while minimizing added complexity.
4Productivity
If flare gas is recovered and converted to syngas, then economically viable products are produced, but the process complexity increases
Solution Approach 1:
The reciprocating engine serves multiple functions: it acts as a compressor for the flare gas, a reactor for partial oxidation to produce syngas, and a generator for mechanical power. This multi-functionality consolidates what would otherwise require separate systems into a single integrated unit, improving productivity while limiting the increase in overall system complexity.
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 effectively recovers flare gas, reducing greenhouse gas emissions and producing economically viable fuels and chemicals, such as methanol, while extending the rich operating limit of internal combustion engines to achieve optimal syngas composition for downstream synthesis.
Implementation Method 1
The pre-chamber promotes rapid combustion in the main chamber
Implementation Method 2
rich fuel/air ignition of waste gases and syngas for partial oxidation to achieve predetermined H2/CO ratios in the reaction products
Implementation Method 3
The pre-chamber communicates with the main chamber via one or more of small orifices. As combustion in the pre-chamber proceeds, turbulent jets of hot gas exit these small orifices, promoting rapid combustion in the main chamber
Data Source
AI summary
There are provided systems and methods for the use of rich limit extenders, and in particular pre-chamber assemblies, for increasing the ability of a spark-ignition engine to operate under fuel-rich conditions. In embodiments the pre-chamber assemblies are combined with spark-ignition engines as a reformer in a gas-to-liquid system for converting a combustible fuel source into synthesis gas. Embodiments of the reformers having pre-chambers provide a synthesis gas product having a H2/CO ratio, with increased H2 concentrations.