Technical Requirements for DGC Residual Gas Content Measuring Device and Its Accessories

DGC Residual Gas Content Measurement Device and Its Supporting Products Introduction
Based on standards: GB/T23250 "Direct Measurement Method of Coal Seam Gas Content Underground" and "Interim Regulations for Gas Extraction Compliance," it is primarily used for measuring residual gas content/desorbable gas content and features rapid sampling functionality. It can be applied in gas emission prediction, outburst risk assessment in working faces and regions, pre-drainage gas evaluation, and gas geological mapping. The DGC residual gas content measurement device and its supporting components directly drill underground to extract coal cores from depth, measure the gas desorption rate and volume of the coal cores, and use mathematical models to calculate the gas loss before the coal sample is sealed in the sample cylinder. Laboratory measurements of relevant parameters determine the original gas content and original desorbable gas content. This equipment offers short measurement time, typically less than 8 hours after sampling; requires less engineering workload compared to indirect methods for measuring coal seam gas content, resulting in lower costs; is less affected by geological structures, allowing for extensive measurement points; and ensures high reliability and accuracy.
DGC Residual Gas Content Measurement Device and Its Supporting Products Technical Parameters
Underground Sampling System and Underground Desorption System:
Coal sample transport speed in the inner tube (m/s): ≥15;
Sampling drill rod: diameter 50mm; torque ≥5000N/m, 100m;
Sampling drill bit: diameter 73mm;
Multi-stage orifice: large negative pressure -91KPa, large suction volume 12.1m³/min, rated air consumption 2.58 m³/min, rated compressed air pressure 0.55 MPa;
Sampling speed (g/min): >500;
Core tube diameter: ￠73, ￠90;
Maximum core depth (m): 50;
Core drilling inclination angle (°): >12;
Required desorption time underground (min): 30;
Underground desorption tube range (ml): 800;
Underground desorption tube accuracy (ml): 5.
Surface Gas Desorption System
Desorption tube accuracy (ml): 5;
Desorption tube effective range (ml/tube): 1000, 1500;
Vacuum pump pumping rate (L/min): 3;
Thermometer (°C): -50～0～500;
Electronic barometer (hPa): 977～1050.
Weighing System
Maximum weighing capacity (g): 2000;
Sensitivity (g): 0.5;
Ambient temperature (°C): 5～35.
Coal Sample Crushing System
Feed particle size: ≤26mm;
Discharge particle size: (80-200) mesh;
Single feed capacity: ≤1000g/bowl;
Crushing time: (3-5)min.
Moisture Measurement System:
Maximum load (g): 10;
Division value (mg): 5;
Differential scale reading range (g): 0～1;
Moisture measurement accuracy: ±0.2g％;
Temperature adjustment range (°C): 75～160.
Data Processing System: Main unit: toner printer; software main functions: user management, Q-value calculation, report output, recalculation, and help, with free software upgrades.
Vacuum Degassing Device:
After placing the vacuum system at the maximum vacuum for 30 minutes, the liquid level of the vacuum gauge rises by no more than 5mm, and no gas leakage occurs in any measuring tube when the leveling bottle is lowered.
Two large measuring tubes (volume 900cm³), minimum graduation 4cm³;
One small measuring tube (volume 300cm³), minimum graduation 2cm³.
Vacuum Pump
Operation mode: Rotary vane;
Rated speed: 1400r/min;
Pumping flow rate: 4L/min;
Vacuum degree: 7×10⁻²Pa.
Digital Display Thermostat:
Temperature control range: 0-105°C;
Temperature control accuracy: ±0.1°C;
Circulation method: Internal circulation;
Temperature control display: Computer-controlled, digital display.
Geological Exploration Gas Desorption Instrument:
Total measuring tube volume: 800ml;
Minimum graduation: 2ml.
Coal sample cans: 15 units
Total volume: >400ml;
Pressure resistance: 15MPa.
Ball mills: 2 units.
Coal sample cylinders: 10 units.
Coal sample cylinder seals: 300 units.

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