Parallel Cryogenic Refrigerator Control for Balanced Helium Flow
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Solution Overview
Problem
Large-scale cryogenic refrigeration installations with multiple refrigerators/liquefiers in parallel face challenges in regulating thermal loads and gas flow distribution, leading to inefficiencies and imbalances due to variable thermal loads and the unique properties of helium, which affects the overall cooling capacity and efficiency.
Innovation Solution
Implementing a method that involves real-time measurement and dynamic regulation of operating parameters such as flow rates and temperature differentials across all refrigerators/liquefiers, using electronic control logic to adjust valves and setpoints to converge these parameters to a dynamic average value, ensuring balanced operation and optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual positioning of control valves is used for regulation, then device complexity is reduced, but manufacturing precision and operational stability deteriorate due to inability to dynamically respond to thermal load variations
Solution Approach 1:
The patent implements a feedback control system where the actual flow rates from multiple refrigerators are continuously measured and compared to target values. Control valves are automatically adjusted based on the difference between actual and target flow rates, enabling dynamic compensation for thermal load variations and maintaining precise flow distribution without excessive system complexity
Solution Approach 2:
The regulation system performs self-adjustment by automatically modifying valve positions based on measured flow rate deviations. The system serves itself by detecting imbalances and correcting them without external intervention, maintaining optimal operation under varying thermal conditions while keeping the control architecture relatively simple
2Manufacturing precision
If independent flow control systems are provided for each refrigerator, then flow distribution precision is improved, but device complexity increases and system stability deteriorates due to fluctuating loads and flow rates
Solution Approach 1:
The patent merges the control functions of multiple refrigerators into a unified regulation system. Instead of completely independent control systems, the invention combines flow measurement and control valve adjustment into an integrated system that manages all refrigerators collectively, reducing overall complexity while maintaining precise flow distribution through centralized coordination
Solution Approach 2:
The control system performs multiple functions: it measures flow rates from all refrigerators, calculates target flow rates based on thermal loads, determines deviations, and actuates control valves. This multi-functional approach consolidates what would otherwise require separate specialized systems, reducing device complexity while maintaining precision
3Manufacturing precision
If independent flow control systems are provided for each refrigerator, then flow distribution precision is improved, but system stability deteriorates due to amplification of imbalances between refrigerators
Solution Approach 1:
The patent uses feedback control to detect flow rate deviations from target values and automatically adjusts control valves to correct these deviations. This closed-loop approach prevents small imbalances from amplifying into large fluctuations, maintaining system stability while achieving precise flow distribution by continuously counteracting disturbances
Solution Approach 2:
The system calculates target flow rates based on thermal loads and proactively adjusts valve positions to prevent flow imbalances before they develop. By anticipating and counteracting potential deviations through pre-calculated target values and continuous correction, the system prevents the amplification of imbalances that would otherwise occur with reactive control
4Productivity
If dynamic regulation is implemented, then productivity is improved through optimal operation, but device complexity increases due to real-time measurement and control requirements
Solution Approach 1:
The patent implements feedback control where flow rates are continuously measured and compared to target values, with control valves automatically adjusted to maintain optimal operation. This dynamic regulation maximizes cooling capacity by ensuring each refrigerator operates at its optimal point while keeping the added complexity manageable through a straightforward measurement-comparison-adjustment cycle
Solution Approach 2:
The patent replaces manual mechanical valve adjustment with automated electronic control. Flow rate measurements and valve actuation are performed electronically based on calculated target values, eliminating the need for manual intervention and enabling dynamic optimization of cooling capacity while adding only moderate electronic control complexity
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
This approach allows for automatic adjustment to variations in thermal parameters, maintaining optimal operation by balancing flow rates, pressures, and temperatures across all refrigerators/liquefiers, thereby enhancing the overall efficiency and stability of the refrigeration installation.
Implementation Method 1
a cold box intended to cool a stream of working gas leaving the compressor station to a cryogenic temperature at least close to its liquefaction temperature
Implementation Method 2
said streams of working gas cooled by each of the respective cold boxes of the refrigerators/liquefiers being mixed then put in heat exchange with the application in order to transfer cold temperatures to the latter
Data Source
Figure 1~2
Figure 3~6
Figure 4~5
AI summary
The invention relates to a method for adjusting a cryogenic refrigeration apparatus (100) including a plurality of liquefiers/refrigerators (L/R) arranged in parallel in order to cool a single application (1), the method comprising a step of calculating in real time the dynamic mean value of at least one operating parameter for all the liquefiers/refrigerators (L/R), the apparatus controlling in real time the at least one valve (4, 5, 6, 7, 8, 9, 10, 11) for controlling the stream of working gas of at least one liquefier/refrigerator (L/R) in accordance with the difference between the instantaneous values of the parameter relative to said dynamic mean value, in order to make said instantaneous values of said operating parameter of the various liquefiers/refrigerators (L/R) converge toward said dynamic mean value.