Gas Mixing Control with Flow Meter Feedback and Pressure Hold
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Solution Overview
Problem
Existing gas blending technologies face challenges in reliably and accurately mixing gases for specific compositions, particularly in maintaining precise ratios and pressures, which is crucial for various industrial and scientific applications.
Innovation Solution
A method involving gas flow meters and a mixture composition control system that adjusts gas flows to maintain predetermined compositions and pressures, calculates instantaneous and cumulative theoretical percentages, and sounds alarms or terminates flows if ratios exceed predetermined ranges, ensuring accurate gas mixing for applications like food processing and welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gas flow meters and control systems are used to maintain precise gas composition ratios, then manufacturing precision of gas mixture composition is improved, but device complexity increases
Solution Approach 1:
The system continuously measures actual gas flows from each component gas and compares them to desired flows, then adjusts control valves to maintain precise composition ratios. This closed-loop feedback mechanism ensures accurate gas mixture composition while providing real-time monitoring and correction of flow deviations.
Solution Approach 2:
The control system performs multiple functions including flow measurement, ratio calculation, composition control, and alarm generation through a single integrated controller. This multi-functional approach reduces the need for separate dedicated devices for each control task, thereby managing system complexity while maintaining precision.
2Reliability
If real-time monitoring and alarm systems are implemented to detect composition deviations, then reliability of gas mixing process is improved, but device complexity increases
Solution Approach 1:
The system continuously monitors actual gas flows and compares them to desired values, triggering alarms or automatic corrections when deviations exceed predetermined thresholds. This real-time feedback monitoring ensures reliable detection of composition errors while maintaining process control through automated responses.
Solution Approach 2:
The system automatically detects composition deviations and triggers corrective actions or alarms without requiring external intervention. The self-monitoring and self-correcting capabilities enhance reliability by ensuring continuous process validation and automatic response to anomalies.
3Manufacturing precision
If multiple flow measurements and calculations are performed at predetermined intervals, then manufacturing precision of gas composition is improved, but use of energy increases
Solution Approach 1:
The system performs flow measurements and composition calculations at predetermined time intervals rather than continuously, reducing computational load and energy consumption while maintaining sufficient measurement accuracy for process control requirements.
Solution Approach 2:
The system performs measurements at intervals that provide sufficient precision for control purposes without excessive measurement frequency. This partial action approach achieves the necessary composition accuracy while avoiding unnecessary energy expenditure from overly frequent measurements.
Data Source
AI summary
Another method of mixing at least two gases is provided. This method includes providing a mixture composition control, comprising a predetermined composition input and a composition trim input. Providing N gas flow meters, wherein N is 3 or more. Configuring the N flow meters to adjust the N gas flows to maintain the line pressure at a predetermined value, while maintaining the predetermined composition. Adding the N measured gas flow, thereby determining the total gas flow at the first predetermined intervals of time. Adjusting the composition trim input to vary the composition of the mixed gas, without modifying the predetermined composition input. And sounding an alarm, and/or terminating both the N gas flows, if either of the following exceed a predetermined range value: the instantaneous calculated theoretical percentage for any of the N gas flows, or the cumulative calculated theoretical percentage for any of the N gas flows.