Closed-Loop Hydrogen Blending Control for Pipeline Composition Limits
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Solution Overview
Problem
Operators of fluid transportation networks face challenges in accurately determining the hydrogen composition in blended fluids, leading to conservative estimates that result in lower actual hydrogen composition, which limits the quantity of hydrogen transported and increases additive usage.
Innovation Solution
A method and system that utilize online sensor data to adjust the hydrogen composition in blended fluids through a closed-loop control scheme, incorporating sensor data and parameters such as fraction, fracture, and equipment parameters to make real-time control decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative estimates of hydrogen composition are used, then the risk of exceeding hydrogen composition limits is reduced, but the actual hydrogen composition in the blended fluid becomes significantly lower than the limit, limiting hydrogen transportation quantity
Solution Approach 1:
The system implements closed-loop feedback control by continuously measuring actual hydrogen composition using sensors (gas chromatographs, mass spectrometers, or online sensors) and adjusting the blending ratio based on the difference between measured composition and target composition. This feedback mechanism eliminates the need for conservative estimates, allowing operators to transport hydrogen at or near the maximum safe composition limit while maintaining compliance.
Solution Approach 2:
The patent replaces manual estimation and conservative calculation methods with automated sensor-based measurement systems. Online sensors, gas chromatographs, and mass spectrometers automatically detect hydrogen composition in real-time, substituting human judgment with precise instrumental measurement. This substitution enables accurate, real-time monitoring that maximizes hydrogen transportation while ensuring limit compliance.
2Reliability
If conservative estimates of hydrogen composition are used, then safety margins are maintained, but additive usage increases to compensate for lower actual hydrogen composition
Solution Approach 1:
The closed-loop control system continuously measures actual hydrogen composition and adjusts additive injection rates based on real-time composition data. When hydrogen composition is accurately maintained at target levels through feedback control, additive usage is optimized rather than increased, as the system only adds additives when and where needed to achieve precise composition control.
Solution Approach 2:
The system dynamically adjusts blending parameters (hydrogen flow rate, natural gas flow rate, additive injection rate) based on real-time composition measurements. By changing these parameters in response to actual conditions rather than using fixed conservative estimates, the system maintains optimal hydrogen composition while minimizing unnecessary additive usage.
3Productivity
If online sensor data and closed-loop control are implemented, then hydrogen composition can be maximized within limits, but system complexity increases
Solution Approach 1:
The control system is designed to be multi-functional, serving both composition monitoring and control optimization purposes. The same sensor data used for measurement also drives the closed-loop control algorithm, eliminating the need for separate monitoring and control systems. This universal approach maximizes hydrogen composition while managing system complexity through integrated design.
Solution Approach 2:
The closed-loop control system is largely self-regulating, automatically adjusting blending ratios based on real-time sensor feedback without requiring constant operator intervention. The system self-corrects composition deviations by modulating flow rates and additive injection, reducing the need for complex manual control procedures while achieving optimal hydrogen composition.
Data Source
AI summary
A method for operating a blending system includes obtaining sensor data of a fluid of an outlet stream of the blending system from sensors of a sensing unit. The method also includes obtaining at least one of a fraction parameter, a fracture parameter, or an equipment parameter a hydrogen composition of the fluid. The method also includes performing a real-time and closed-loop control scheme using the sensor data and at least one of the fraction parameter, the fracture parameter, or the equipment parameter to determine one or more control decisions. The method also includes operating one or more controllable pipeline elements to adjust the hydrogen composition of the fluid according to the one or more control decisions.