Gas Control System for Low-BTU Methane Utilization
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Solution Overview
Problem
Existing methane gas extraction systems from coal mines face inefficiencies due to the impure and low-quality nature of methane recovered, often requiring high concentrations of methane to operate effectively, whereas coal mine boreholes typically yield dilute methane with contaminants.
Innovation Solution
A gas control system comprising a blower, fuel collector, heated dryer, and engine that collects, purifies, and regulates the air-to-fuel ratio of methane gas, allowing the system to operate with low-quality methane by using a special choke and secondary fuel line to adjust the air-to-fuel mixture, and incorporating an LP gas system for backup fuel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing methane gas extraction systems are used, then methane can be recovered from coal mine boreholes, but the system cannot operate effectively with low-quality dilute methane due to high concentration requirements
Solution Approach 1:
The system changes the air-to-fuel ratio parameter dynamically based on methane quality. The controller adjusts the ratio of air to methane mixed with the fuel stream, allowing the engine to operate effectively across a wide range of methane concentrations from 300 to 700 BTU per cubic foot, thereby resolving the contradiction between adaptability to different methane qualities and reliable operation.
Solution Approach 2:
The system employs dynamic adjustment mechanisms including variable geometry mixers and controllable orifices that can change their configuration in real-time. The controller continuously monitors methane quality and adjusts the air-to-fuel mixing ratio accordingly, enabling the system to adapt to varying methane concentrations while maintaining reliable engine operation.
2Power
If high concentration of methane is required for effective operation, then engine efficiency is maintained, but the system cannot utilize dilute methane from coal mine boreholes
Solution Approach 1:
The system changes the air-to-fuel ratio parameter to compensate for dilute methane. By increasing the air-to-fuel ratio when methane concentration is low, the system maintains proper combustion conditions and engine efficiency while utilizing dilute methane from boreholes, thus resolving the contradiction between maintaining power and adapting to low-quality fuel.
Solution Approach 2:
The system introduces atmospheric air as an intermediary substance that is mixed with the methane-fuel stream. This air acts as a mediator to adjust the overall energy content and combustion characteristics, allowing the engine to burn dilute methane efficiently by supplementing it with additional air, thereby maintaining power output while utilizing low-quality fuel.
3Reliability
If methane gas is collected and purified through heating, then water vapor is condensed and removed, but the system complexity increases with additional components
Solution Approach 1:
The system merges the heating function with the condensation function into a single integrated heated dryer assembly. The heater element and condensation trap are combined in one component, allowing water vapor to be condensed and removed from the methane stream while minimizing the number of separate parts, thus resolving the contradiction between purification quality and system complexity.
Solution Approach 2:
The system uses the methane stream itself as the heating medium. The methane gas is heated as it passes through the dryer, utilizing its own thermal energy to condense water vapor, thereby reducing the need for external heat sources and complex heating systems while maintaining effective purification.
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
Enables the efficient utilization of methane gas with as low as 300 BTU per cubic foot, improving the operational flexibility and reliability of the system in varying methane quality conditions.
Implementation Method 1
A heated dryer collects and eliminates moisture from the air stream containing the methane gas
Implementation Method 2
generates a vacuum that draws the air stream from the borehole
Implementation Method 3
an engine that is fueled by the collected gas
Data Source
AI summary
The gas control system removes gas from a borehole by generating and collecting an air stream from the borehole using a blower, collecting the gas contained in the air stream using a fuel collector, removing moisture from the gas using a heated dryer, and transporting the gas from the heated dryer to an engine that is at least partially fueled by the gas. The gas control system can include one or more sensors that provide data associated with operating conditions of the gas control system. The sensor data is provided to a manager component, and can be used to evaluate system performance, determine consumption of greenhouse gases and optimize system operations.