Real-Time LNG Tank Autonomy Calculation Algorithm
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Solution Overview
Problem
Current methods lack real-time calculation of the duration of autonomy for non-refrigerated natural gas tanks containing liquefied natural gas (LNG), leading to inefficiencies in logistics and potential methane emissions, as operators rely on static pressure measurements and lack flexibility in managing unbalanced LNG states.
Innovation Solution
A method and system that utilize sensors to measure thermodynamic parameters and tank data, employing an algorithm to calculate the duration of autonomy by iteratively calculating pressure changes based on mass and energy conservation equations, accounting for compressibility, heat entry, and evaporation, until the valve opening pressure is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If real-time calculation of duration of autonomy is implemented, then logistics flexibility and operational efficiency are improved, but device complexity and implementation cost increase
Solution Approach 1:
The patent pre-stores thermodynamic properties data (pressure, temperature, composition relationships) and fills rate data in memory before operation. This preliminary preparation allows the microcontroller to perform real-time duration of autonomy calculations using stored data and current sensor readings, avoiding complex real-time measurements and reducing computational complexity during operation.
Solution Approach 2:
The patent introduces a microcontroller as an intermediary device that mediates between sensors (pressure, temperature), stored data (thermodynamic properties, fill rates), and the display interface. The microcontroller executes pre-programmed algorithms to calculate duration of autonomy, simplifying the overall system architecture while enabling real-time monitoring and flexibility.
2Device complexity
If static pressure measurements are used, then device complexity is reduced, but information accuracy and operational decision-making capability deteriorate
Solution Approach 1:
The patent implements a feedback system where sensors continuously measure pressure and temperature, the microcontroller calculates duration of autonomy based on these readings and stored thermodynamic data, and the results are displayed in real-time. This closed-loop feedback provides operators with accurate, up-to-date information about remaining LNG retention time, enabling informed operational decisions.
Solution Approach 2:
The patent replaces manual pressure gauge readings and experience-based decision-making with an automated electronic calculation system. The microcontroller substitutes human judgment with algorithmic calculations based on thermodynamic principles, providing objective and accurate duration of autonomy information without requiring operator expertise in interpreting pressure trends.
3Measurement precision
If maximum retention time is calculated under precise standard conditions, then measurement precision is improved, but adaptability to real-world varying conditions deteriorates
Solution Approach 1:
The patent stores multiple sets of thermodynamic properties data corresponding to different LNG conditions (various pressures, temperatures, compositions and fill rates). Instead of using a single fixed retention time value, the system selects and uses the appropriate thermodynamic data set based on current measured conditions, enabling accurate duration of autonomy calculation across varying real-world operating conditions while maintaining precision.
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 real-time prediction of LNG tank autonomy, improving logistics flexibility, managing unbalanced LNG states, and reducing methane emissions by providing operators with accurate retention time information.
Implementation Method 1
accounting for compressibility, heat entry, and evaporation
Implementation Method 2
accounting for compressibility, heat entry, and evaporation
Implementation Method 3
employing an algorithm to calculate the duration of autonomy by iteratively calculating pressure changes
Implementation Method 4
measure thermodynamic parameters and tank data
Data Source
AI summary
This invention relates to a method and a system for calculating in real-time the duration of autonomy of a non-refrigerated tank containing natural gas comprising a liquefied natural gas (LNG) layer and a gaseous natural gas (GNG) layer. This invention also relates to a system for calculating, in real time, according to the method of the invention, the duration of autonomy of a non-refrigerated tank, as well as a vehicle comprising an NG tank and a system according to the invention.