Technologies and Equipment to Control and Improve UNDERGROUND MINE SAFETY Lunagas Pty Limited Beijing, CHINA, Beijing, CHINA, April 2004 Les Lunarzewski - Managing Director

Gassy Underground Coal Mines REQUIREMENTS 1. GAS MANAGEMENT PLAN 2. AUTOMATIC GAS MONITORING SYSTEM 2. AUTOMATIC GAS MONITORING SYSTEM (UNDERGROUND – SURFACE) 3. EFFICIENT GAS DRAINAGE

 Local mine detailed instructions for coal mine management, technical staff & miners  Necessary techniques and equipment  Thresholds, limitations, measurements and monitoring Gas Hazard & Outburst MANAGEMENT PLAN Successful implementation of the Management Plan requires three consecutive steps: Prediction - Prevention - Protection

Automatic Gas Monitoring Underground - Surface Automatic Gas Monitoring Underground - Surface

Gas Monitoring System for Measurements CH4, CO2, CO & O2 Goaf CH4 5 % - 15% Surface Station Sensors

Gas drainage is a system which recovers gas from coal seams & piping it independently to the gas drainage plant on the surface. This is carried out for safety purposes to avoid fatalities or injury & to reduce the loss & delay of coal production as well as utilise coal mine methane Gas drainage Gas drainage

FLOORGAS - ROOFGAS Geo-mechanical & Gas Release SOFTWARE

Longwall

Roof & Floor Strata Relaxation Zones Geomechanical & Gas Release Model Roofgas 3.1 Roofgas 3.1 & Floorgas 2.0 Computer Programs

Data input Strata relaxation generation Application for ventilation & gas drainage systems design Longitudinal cross-section Floorgas & Roofgas Software Simulation Sequence

Vertical and horizontal scales 10 m Gas well Hole Blue Hole Green Hole Orange Hole Black Hole Blue Hole Green Hole Orange Hole Black MG Roofgas 3.1 simulation output using Rock Strata Curvature Enforcement Model Vertical and horizontal cross sections for 150m distance behind the face

Roofgas output & designed up-holes Floorgas output & designed down-holes

Gas Emission Prediction

Gas Emission During & Post Extraction

Equipment for coal mine gas recovery & utilisation

U/G hole, manifold, water separator, measuring set & methane pipe joints First stage separator

Water – gas separation under vacuum conditions Self operating float assembly controlling water separation from gas drainage pipe line or underground holes under suction conditions The device required no external power and utilise a permanent magnet and the force of gravity only Automatic water - gas separator Gas Air Water

Underground Mobile Methane Drainage Plant. Type PUPG - 1

Surface Gas Drainage Plant

Ê Gas Management for Safety Purposes u Underground coal mine gas management u Strata relaxation & gas emission prediction u Gas drainage technology design & optimisation Ë Research, Technology & Equipment u Gas research, know-how & software u U/G - surface equipment & gas drainage PLANTS Lunagas specialises in:

Reasons for using Roofgas- Floorgas software in CHINA  High depth of mining  Huge number of gassy underground coal mines  Low permeability of coal seams  Complex and vast variations in local geology  Gas release increases as a consequence of mining activities (longwall extraction)  Software input data are available from coal mine and geologists documentations

 Simple and obvious outputs of the software, which shows roof and floor visible zones where from the maximum quantity of gas could be captured by gas drainage system  Utilisation of personal computer (PC) for running software and design gas drainage system  Output interpretation and graphical design could be done by mine people, directly on PC screen and printed as vertical and horizontal cross sections, including drainage hole parameters  The software algorithm utilises the unique research and empirical results from underground coal mines in Australia, Poland, Czech Republic, Japan and the USA

Gas drainage efficiency: Longwall30 – 80 % Total mine 25 – 60 % Longwall Ventilation: m 3 air/sec (50% capture & 2% in return) Gas drainage cost (US$) : $/tonne Longwall Achievements in Australian Gassy Coal Mines

LW Coal production: up to 30,000 t/day In situ gas content : up to 16 m 3 gas/t Longwall gassiness : up to 5,000 litres gas/sec Total mine gassiness : up to 8,000 litres gas/sec Gas flow per hole : litres CH 4 /sec

Thank you for your kind attention