Methane Number Calculation System for CNG Compliance
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Solution Overview
Problem
The inconsistency in Methane number calculations for compressed natural gas (CNG) due to varying formulas, techniques, and regulatory standards leads to non-compliant fuel production, where producers may avoid costly ethane content reduction by eliminating heavier hydrocarbons instead, causing inconsistencies in fuel quality and compliance issues across different regulatory and engine manufacturer protocols.
Innovation Solution
A system and method that utilize multiple analyzing devices and processing circuitry to calculate Methane numbers using different protocols, allowing for simultaneous generation of Methane numbers compatible with various standards, and refining CNG fuel by injecting a refined gas with a known Methane number to meet predetermined thresholds, ensuring compliance with regulatory and engine manufacturer requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple different formulas and techniques are used to generate Methane numbers according to various regulatory protocols, then producers can avoid costly ethane content reduction by eliminating heavier hydrocarbons instead, but this leads to inconsistencies in fuel quality and compliance issues across different protocols
Solution Approach 1:
The system provides a universal Methane number calculation platform that supports multiple regulatory protocols (ISO 20483, SAE J2848, ASTM D1945, GB 18047, APA/ISO, APA/GB) through a single integrated system. The processing circuitry can selectively apply different calculation methods based on the chosen protocol, eliminating the need for separate calculation systems for each regulation while ensuring consistent and accurate results across all protocols.
2Ease of manufacture
If producers eliminate heavier hydrocarbons instead of reducing ethane content to improve Methane number, then the refining process becomes less difficult and less expensive, but the fuel composition becomes inconsistent with protocols that account for higher hydrocarbons
Solution Approach 1:
The system incorporates feedback mechanisms where the processing circuitry calculates Methane numbers based on actual compositional data from analyzing devices, compares results against protocol-specific requirements, and provides guidance on whether the fuel composition meets the selected regulatory standard. This feedback loop ensures producers can verify compliance and adjust refining strategies accordingly, rather than relying on simplified elimination approaches.
3Adaptability or versatility
If calibration gases and calculation techniques vary across different protocols, then flexibility in meeting different regulatory standards is improved, but inconsistencies in the final Methane number values are introduced
Solution Approach 1:
The system implements parameter changes by allowing selective adjustment of calculation parameters based on the chosen protocol. The processing circuitry modifies the Methane number calculation parameters (such as which hydrocarbon components are considered, calibration gas compositions, and mathematical formulas) to match the specific requirements of each regulatory standard, ensuring both adaptability and measurement precision simultaneously.
Data Source
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AI summary
Systems and methods for generating a Methane number for a compressed natural gas fuel by obtaining compositional data from one or more particular analyzers and applying the obtained compositional data to one or more selectable Methane number generation protocols. The systems and methods can include refining of the compressed natural gas fuel to meet a predetermined Methane number.