Automatic Gas Content Determination DeviceDGC-II

Application Scope

      The gas content determination device is mainly used for directly measuring the original gas content of coal seams and the original desorbable gas content of coal seams. It can be applied in gas emission prediction, outburst risk assessment for working faces and regions, evaluation of pre-drainage gas effectiveness, and compilation of gas geological maps.

Product Principle

    By drilling directly underground to collect coal cuttings from predetermined depths, the gas desorption rate and desorption volume of the coal cuttings are measured. A specific mathematical model is used to calculate the gas loss before the coal sample is sealed in the sample canister. Laboratory measurements of relevant parameters are used to determine the original gas content and original desorbable gas content. This equipment employs a fixed-point sampling method, and the measurement results show a strong correlation with actual gas emission dynamics and outburst prediction indicators (such as drilling cuttings desorption index and initial gas emission velocity). The results meet the requirements for predicting gas emissions and coal-rock dynamic disasters in underground coal mines. The technology and accompanying instruments have been successfully promoted and applied in multiple mines across China.

Technical Parameters

Testing Time: <2h

Underground Coring and On-Site Desorption System

Dedicated Underground Desorption Meter: Single test range 800ml (can be customized to 1000ml upon request), high-brightness corrosion-resistant acrylic tube, stable base, clear graduations;

Underground Desorption Cylinder Accuracy: 2ml; Single range 800ml or 1000ml.

Underground Desorption Time: 0-30min;

Dedicated Coal Sample Canister: Material stainless steel/alloy, capacity over 800g;

Surface Gas Desorption System

Pressure Sensor Range: 10Kpa

Pressure Sensor Accuracy: 0.1% FS

Temperature: 0℃～100℃

Atmospheric Pressure: 600hpa-1100hpa

Coal Sample Weighing System

Digital Electronic Balance Maximum Load: 2000g

Electronic Balance Sensitivity: 0.1g

Power Supply Voltage: 220v

Ambient Temperature: 5-35℃

Power: 5W

Dedicated Coal Sample Weighing Containers: One each of 100g and 200g

Dedicated Coal Sample Weighing Spoons: One each of 50g and 100g

Coal Sample Crushing and Desorption System

Crusher Feed Particle Size: ≤30mm;

Crusher Discharge Particle Size: 40-180 mesh;

Operating Power Supply: 220V, 50HZ;

Single Feed Capacity: ≤1000g/bowl;

Crushing Time: Adjustable (0-5)min;

Motor Power: 0.75kW

Crusher Features: Low noise, effective crushing.

Moisture Determination System

Maximum Load: 110g

Minimum Division Value: 5mg

Minimum Sample Amount: 0.5g

Moisture Determination Accuracy: 0.1g%

Data Processing System

Software Operating Environment: Windows XP, Win7 systems;

Software Main Functions: User management, data process report output, experimental result report output, experimental data report output, calculation of gas content W value, calculation of desorbable gas content Wa, residual gas content Wc, calculation of gas pressure P, calculation of cumulative gas desorption volume Q, report output, printing, and help.