Variable-Volume Gas Accumulator for Multi-Analysis Sampling
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Solution Overview
Problem
Conventional chemical analysis methods for detecting elements like carbon in samples are limited by single-pass measurements, which prevent storage of samples for later analysis, restrict multiple analyses, and are inefficient due to detector range limitations and operational inefficiencies with high or low concentrations of the target element.
Innovation Solution
A system and method utilizing a variable-volume accumulator to store sample gases, allowing for multiple analyses and broader dynamic range measurements, featuring a flexible bag or membrane to maintain constant pressure and minimize equipment complexity, with an analyzer capable of analyzing aliquots of the stored gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-pass measurement system is used, then the measurement process is simple and quick, but the sample cannot be stored for later analysis and multiple analyses cannot be performed
Solution Approach 1:
The measurement process is divided into separate stages: sample collection in the accumulator, followed by sequential analysis stages. The first analyzer processes the sample, then the same sample can be re-analyzed by a second analyzer or re-injected into the first analyzer, enabling multiple analyses without requiring additional samples.
Solution Approach 2:
The sample is collected and stored in the accumulator before analysis begins. This preliminary collection action allows the sample to be preserved and made available for multiple subsequent analyses, rather than being consumed in a single pass measurement.
2Measurement precision
If a calibrated analyzer with fixed detection range is used, then the measurement is precise within the calibration range, but samples with concentrations above or below the detection limits cannot be properly analyzed
Solution Approach 1:
The system dynamically adjusts the analysis process based on the sample concentration. When a sample exceeds the detection range, the system can introduce dilution gas to reduce concentration, or concentrate the sample if too dilute, allowing the analyzer to operate within its optimal detection range for various concentration levels.
Solution Approach 2:
The system changes operational parameters such as gas flow rates, dilution ratios, and integration times to accommodate samples with varying concentrations. By adjusting these parameters, the analyzer can accurately measure samples across a broader dynamic range while maintaining precision within the calibration range.
3Device complexity
If direct measurement without sample accumulation is used, then the equipment complexity is low, but the system cannot handle varying sample concentrations effectively and lacks operational flexibility
Solution Approach 1:
The accumulator serves multiple functions: it stores the sample gas, controls the flow rate to the analyzer, enables sample retention for later analysis, and provides the capability for multiple analyses of the same sample. This multi-functional design adds versatility without proportionally increasing complexity.
Data Source
AI summary
A system and method for capturing a sample gas for analysis is disclosed. In one embodiment, the system includes an accumulator that has a variable volume. A volume of the sample gas is fed to the accumulator. The system also has an analyzer. An aliquot of the sample gas is withdrawn from the accumulator and fed to the analyzer. The analyzer analyzes a desired component of the sample gas.