研究目的
Investigating the use of near-infrared (NIR) spectroscopy for the real-time determination of ammonia/water composition in an absorber test bench.
研究成果
NIR spectroscopy is an appropriate technique for measuring the concentration of ammonia/water mixtures in real time with an acceptable mean deviation of 0.0024 compared to density measurements. Further studies are needed to fully establish its applicability.
研究不足
The technique is still under study, and the effect of flow rate, temperature, and pressure on the spectra, though negligible under the tested conditions, may require further investigation under broader conditions.
1：Experimental Design and Method Selection:
The study utilized NIR spectroscopy for real-time composition measurement. Two cells were designed: a static cell for calibration under controlled conditions and a dynamic cell for in-situ measurement in an absorber test bench.
2：Sample Selection and Data Sources:
Ammonia/water mixtures with different mass fractions were prepared for calibration. Spectra were recorded between 990-1069 nm.
3：List of Experimental Equipment and Materials:
Static and dynamic cells with sapphire windows, Maya 2000 Pro Vis-NIR spectrophotometer, HL-2000-CAL tungsten halogen light source, high-pass filter (>590 nm), thermostatic bath, magnetic stirrer, analytical balances, and a vacuum pump.
4：Experimental Procedures and Operational Workflow:
The static cell was used for calibration under controlled conditions. The dynamic cell was integrated into the absorber test bench for real-time measurement. Spectra were corrected using a weighted-least-squares baseline function.
5：Data Analysis Methods:
A linear regression model between absorbance at 1033 nm and ammonia concentration was established. The model was validated by comparing with density measurements.
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