Argon Distillation Column Flow Control for Dioxygen Content Precision
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Solution Overview
Problem
Current methods for improving argon purity at the outlet of a distillation column do not adequately account for dioxygen content, delays in the distillation process, and external disturbances, leading to suboptimal argon purity.
Innovation Solution
A system comprising a sensor to measure dioxygen content, a regulator to determine argon flow rate variations, a controller to generate a control signal for a target argon flow rate, and a valve to adjust the argon flow rate, incorporating predictive values and an anticipation parameter to correct for non-linear dioxygen content variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional PID controllers are used to regulate argon flow rate, then the control system is simple and easy to operate, but the system cannot adequately account for non-linear dioxygen content variations, process delays, and external disturbances, leading to suboptimal argon purity
Solution Approach 1:
The controller predicts future dioxygen content values based on historical data and process characteristics before the actual deviations occur. This predictive capability allows the system to take preliminary control actions to counteract non-linear variations and external disturbances, improving argon purity without requiring overly complex real-time control mechanisms
Solution Approach 2:
The system implements a feedback mechanism where the controller continuously receives measured dioxygen content values, compares them with predicted values, and adjusts the argon flow rate accordingly. This closed-loop feedback enables the system to compensate for process delays and external disturbances while maintaining manageable control system complexity
2Productivity
If the distillation column operates with fixed flow rates, then the operation is stable and easy to control, but the system cannot respond to external disturbances and non-linear dioxygen content variations, resulting in reduced argon recovery
Solution Approach 1:
The system transitions from fixed flow rates to dynamic flow rate adjustment based on real-time dioxygen content measurements and predictions. The controller dynamically modifies the argon flow rate to respond to external disturbances and non-linear variations, maximizing argon recovery while maintaining operational stability through automated control
Solution Approach 2:
The controller changes the flow rate parameter dynamically based on the difference between measured and predicted dioxygen content values. By adjusting this critical parameter in response to process conditions, the system achieves higher argon recovery while maintaining stability through adaptive control rather than fixed operations
3Measurement precision
If the system accounts for process delays by using delayed air flow rate values, then the control accuracy is improved, but the computational complexity and data processing requirements increase
Solution Approach 1:
The controller pre-processes air flow rate data by applying appropriate delays to account for process transit times before using these values in predictions. This preliminary data preparation improves measurement accuracy by synchronizing data timestamps with actual process conditions, while the delay mechanism itself remains a relatively simple computational operation
Solution Approach 2:
The system introduces delayed air flow rate values as intermediary data that mediates between raw measurements and final control decisions. These delayed values serve as a bridge to account for process delays, improving measurement accuracy without requiring complex real-time processing of all raw data streams
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 system effectively achieves a target dioxygen content of 0.9 ppm, maximizing argon recovery and purity by accounting for process delays and disturbances, and compensating for the limitations of traditional PID controllers in managing non-linear dioxygen content profiles.
Implementation Method 1
a sensor designed to measure a dioxygen content in a fluid comprising argon at the outlet of the assembly of at least one distillation column
Implementation Method 2
Distillation is a process for separating the different constituents of a homogeneous liquid mixture. Specifically, these constituents generally have distinct boiling temperatures (or vaporization temperatures) so that, under the effect of increasing the temperature, the constituents of the liquid mixture will be converted to gas at different temperatures, which thus makes it possible to separate them from each other.
Implementation Method 3
a valve controlled by said controller and designed to modify the argon flow rate of the fluid at the outlet of the assembly of at least one distillation column
Data Source
AI summary
The invention relates to a system for controlling an argon flow rate of a fluid at the outlet of an assembly of at least one distillation column in order to reach a target dioxygen level (SP). The system comprises: a sensor arranged so as to measure a dioxygen level (PV) in a fluid containing argon at the outlet of the assembly of at least one distillation column; a regulator arranged so as to determine a required argon flow rate variation (Δregul) according to the difference between the dioxygen level measured by the sensor and a target dioxygen level; a controller arranged so as to generate a control signal relating to a targeted argon flow rate, said targeted argon flow rate being determined according to the required argon flow variation determined by the regulator and variations in the dioxygen level measured by the sensor; and a valve, controlled by said controller, which is arranged so as to modify the argon flow rate of the fluid at the outlet of at least one distillation column in order to achieve the targeted argon flow rate.