Mine gas analysisTechnical methods:

Sampling method:

Direct sampling method: using a syringe, plastic bag, or bladder to directly collect gas samples, suitable for rapid qualitative analysis.

Enrichment sampling method: Enriching gases through solution absorption (such as hydrogen peroxide absorbing SO ₂, barium hydroxide absorbing CO ₂) requires flow meters and pumping power devices, suitable for low concentration gas detection.

Remote automatic sampling method: The gas sample is transported to the ground laboratory through a tube bundle to achieve automated analysis.

Analysis instrument:

Gas chromatograph:

GC-4285 type: Double column box and three column parallel structure, supporting synchronous analysis of 13 gases (O ₂, N ₂, CH ₄, C ₂ H ₂, etc.), completing full component detection in 15 minutes, with a sensitivity of 10 ⁻⁶ level.

GC-4085B type: Dual column box with temperature control, equipped with dual hydrogen flame detector and thermal conductivity detector, capable of analyzing 10 gases within 4-8 minutes, with a minimum detection concentration of CO ≤ 0.5ppm.

Spectral method: using infrared/ultraviolet spectroscopy to detect gas concentration, such as infrared spectroscopy to detect CH ₄ and CO ₂.

Electrochemical method: detecting O ₂, CO, etc. through gas sensors (such as AY-1B oxygen detector), with rapid response and easy operation.

Portable devices, such as miniature gas chromatographs and multi parameter gas detectors, support real-time monitoring underground.

Data processing and warning:

Explosion Triangle Algorithm: Real time assessment of gas explosion risk level by analyzing CH ₄, O ₂, and CO concentrations.

Intelligent warning system: integrates gas concentration over limit alarm, data network sharing, and analysis report printing functions.