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A multiline fitting method for measuring ethylene concentration based on WMS-2f/1f.

W F Wang1,2, B Yang1,2, H F Liu1,2

  • 1School of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an, 710054, Shaanxi, China.

Scientific Reports
|September 15, 2023
PubMed
Summary
This summary is machine-generated.

A new multi-line fitting method accurately measures ethylene (C2H4) gas, a key indicator for coal spontaneous combustion. This technique significantly reduces measurement errors compared to traditional methods, enhancing mine safety.

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Area of Science:

  • Mining Engineering
  • Analytical Chemistry
  • Spectroscopy

Background:

  • Coal spontaneous combustion poses a significant risk in deep mining, impacting safety and sustainability.
  • Ethylene (C2H4) is a critical early warning indicator for coal spontaneous combustion.
  • Accurate detection of C2H4 is challenged by cross-interference with methane (CH4) absorption lines in near-infrared spectroscopy.

Purpose of the Study:

  • To develop and validate a novel multi-line fitting method for precise C2H4 concentration calibration.
  • To overcome the spectral interference between CH4 and C2H4 absorption lines.
  • To improve the accuracy of Tunable Diode Laser Absorption Spectroscopy (TDLAS) for coal spontaneous combustion monitoring.

Main Methods:

  • Utilized Tunable Diode Laser Absorption Spectroscopy (TDLAS) combined with wavelength modulation spectroscopy (WMS).
  • Employed a multi-line fitting algorithm to analyze measured and simulated WMS-2f/1f signals.
  • Calibrated C2H4 concentration using an Environics2000 automatic standard gas dispenser for high-precision gas mixtures.

Main Results:

  • The multi-line fitting method achieved a maximum relative error of 2.40% for C2H4 concentration measurement.
  • This represents a 54% reduction in error compared to the conventional 2f peak measurement method.
  • The proposed method effectively mitigates cross-interference issues between CH4 and C2H4 absorption lines.

Conclusions:

  • The multi-line fitting algorithm is highly effective for accurate C2H4 concentration inversion in the presence of spectral interference.
  • This advancement significantly enhances the reliability of TDLAS technology for early warning of coal spontaneous combustion.
  • The study provides a robust solution for real-time, on-line monitoring of critical indicator gases in deep coal mines.