Carbon-Neutral Methane Grid Management for Calorific Value Control
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Solution Overview
Problem
The introduction of carbon neutral methane (CN-CH4) into existing gas grids faces challenges due to variations in calorific value, requiring both digital-based transactions and physical management of the grid to maintain gas quality, unlike electric power trading which only requires digital transactions.
Innovation Solution
A carbon neutral methane management system that includes an arithmetic processing unit to calculate calorific values, a supply/use management unit to adjust gas amounts, and a certificate issuing unit to ensure compliance with grid restrictions and issue certificates for CN-CH4 supply and use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carbon neutral methane is introduced into the existing gas grid, then carbon neutral gas distribution goal is advanced, but gas quality (calorific value) becomes variable and difficult to control
Solution Approach 1:
The system dynamically adjusts the proportion of city gas and carbon neutral methane based on their respective calorific values to maintain the mixed gas within the required calorific value range. The control unit calculates appropriate mixing ratios by comparing the calorific values of individual gas components and adjusts supply quantities accordingly, transforming a quality control problem into a parameter optimization problem.
Solution Approach 2:
The system implements feedback control by continuously monitoring the actual calorific value of the mixed gas and comparing it with the target range. Based on this feedback, the control unit adjusts the supply quantities of city gas and carbon neutral methane in real-time, ensuring stable gas quality despite variations in carbon neutral methane introduction.
2Adaptability or versatility
If carbon neutral methane is supplied to the grid, then environmental value trading is enabled, but physical grid management complexity increases
Solution Approach 1:
The system merges digital certificate management with physical gas supply control into an integrated management framework. The control unit coordinates both the physical mixing of gases and the digital issuance of carbon neutral certificates, ensuring that environmental value trading reflects actual physical gas composition and supply conditions.
Solution Approach 2:
The control unit acts as an intermediary between carbon neutral methane suppliers, city gas suppliers, and certificate issuing authorities. It receives supply information from various sources, calculates calorific values, determines appropriate mixing ratios, and coordinates the entire process to enable environmental value trading while managing physical grid operations.
3Productivity
If mixed gas with varying calorific value is distributed, then carbon neutral methane utilization increases, but fair trading between suppliers and consumers becomes difficult
Solution Approach 1:
The system uses feedback from actual gas supply and consumption data to calculate accurate calorific values of mixed gas. This feedback mechanism ensures that trading terms reflect real-world conditions, providing transparency and fairness in transactions between carbon neutral methane suppliers, city gas suppliers, and consumers.
Solution Approach 2:
The control unit performs preliminary calculations of calorific values and determines trading conditions before gas supply and consumption occur. By pre-calculating the expected calorific value based on planned supply quantities and compositions, the system establishes fair trading terms in advance, avoiding disputes and ensuring transparency in the trading process.
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
The system effectively manages gas composition changes in the grid, ensuring fair trading and maintaining calorific value within specified ranges, thereby enabling the issuance of CN certificates.
Implementation Method 1
an arithmetic processing unit that calculates a calorific value of the mixed gas in the grid
Implementation Method 2
a supply/use management unit that gives an instruction to adjust at least an amount of the city gas supplied to the grid or an amount of the city gas used by the user or an amount of the carbon neutral methane supplied to the grid or an amount of the carbon neutral methane used by the user
Implementation Method 3
Synthetic methane is created by a reaction expressed by the following chemical formula (1). CO2 + 4H2 → CH4 + 2H2O
Implementation Method 4
biomethane produced by fermentation treatment of organic wastes, such as food waste and livestock manure
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A carbon neutral methane management system (1) is used for a grid that supplies a user with a mixed gas including city gas and carbon neutral methane (hereinafter, "CN-CH4"). The carbon neutral methane management system (1) includes: an arithmetic processing unit (13) that calculates a calorific value of the mixed gas in the grid; a supply/use management unit (12) that gives an instruction to adjust at least an amount of the city gas supplied to the grid or an amount of city gas used by the user or an amount of CN-CH4 supplied to the grid or an amount of CN-CH4 used by the user so that the calorific value of the mixed gas is kept within a restriction range of the grid; and a certificate issuing unit (11) that issues a certificate certifying that an amount of CN-CH4 supplied to the grid by a CN-CH4 supplier matches an amount of CN-CH4 supplied that has been adjusted by the supply/use management unit or a certificate certifying that an amount of CN-CH4 used by the user matches an amount of CN-CH4 used that has been adjusted by the supply/use management unit.