RICH's coal mine nitrogen injection system is a series of innovative products developed for the demand of underground coal mining, which can effectively prevent the gas explosion and coal dust explosion in underground coal mines, and provide a strong guarantee for underground coal mining operations. We provide horizontal portable nitrogen injection products for underground coal mining operations, especially ultra-large nitrogen injection products.
Safety and operational reliability are critical in coal mining. RICH, since 1979, has delivered 4,000+ gas production systems worldwide. We provide on-site nitrogen, oxygen, and drying solutions tailored to the coal mining industry, helping prevent hazards, improve process efficiency, and maintain gas supply continuity underground and at surface facilities.
Explosion and fire risks: Methane and coal dust require inerting and controlled atmospheres.
Oxygen management: Maintaining safe O₂ levels to prevent combustion hazards.
Process continuity: Interruptions in gas supply can delay coal handling, processing, and transportation.
Humidity & moisture control: Wet mines and equipment require dry, clean gas to avoid corrosion and sensor failures.
Equipment reliability: Remote underground locations demand low-maintenance, durable systems.
Logistics challenges: Cylinder delivery underground is costly, risky, and limited in accessibility.
Mine inerting & blanketing: N₂ injection for explosion prevention in conveyors, silos, storage areas, and processing plants
Ventilation & safety gas supply: Controlled O₂ and N₂ for monitoring stations, refuges, and underground facilities
Process gas supply: Nitrogen for coal handling, crushing, screening, and pelletizing plants
Moisture control & instrumentation: Dry gas for pneumatic systems, sensors, and conveyors
Emergency backup & mobile systems: Portable or skid-mounted PSA/membrane systems for rapid deployment
PNF / PNF+ PSA Nitrogen Generators — on-site nitrogen for inerting and explosion prevention.
Membrane Nitrogen Generators — compact, low-maintenance N₂ for continuous flow in mine facilities.
POF Series PSA Oxygen / VPSA Oxygen Plants — controlled O₂ supply for safe mining operations.
Desiccant Dryers / Drying Systems— low dew point gas for instruments, pneumatics, and sensitive equipment.
All systems can be configured for hazardous area compliance (ATEX/IECEx) and remote monitoring.
Purity and reliability: RL-VI process (where applicable) and load-adaptation ensure consistent N₂ supply to inert explosive atmospheres.
Energy efficiency: Optimized adsorption tower design reduces feed-air and compressor load, lowering operational costs.
Durable design: Pneumatic valves, self-compressing cylinders, and robust tower internals extend service life even in harsh underground conditions.
Moisture & corrosion control: Integrated desiccant dryers protect instrumentation, sensors, and pneumatic equipment.
Remote operation & monitoring: Systems designed for automated control with feedback, enabling minimal manual intervention underground.
1. Mine inerting / explosion prevention
Problem: Methane and coal dust increase explosion risk.
Solution: PNF+ PSA nitrogen generator delivering N₂ to silos, conveyors, or storage areas.
Benefit: Reduced O₂ below safe thresholds, lowering explosion risk, and reducing regulatory violations.
2. Ventilation & safe refuge gas supply
Problem: Uncontrolled O₂ levels in underground shelters or monitoring stations.
Solution: VPSA oxygen and PSA N₂ systems for controlled safe atmospheres.
Benefit: Stable, safe air composition for personnel and emergency refuges.
3. Dry gas for instrumentation and process equipment
Problem: Moisture leads to corrosion or sensor failures.
Solution: PSA nitrogen with integrated desiccant drying.
Benefit: Reliable sensor and pneumatic operation; reduced downtime.
4. Mobile/portable backup systems
Problem: Emergency or temporary underground works need rapid gas deployment.
Solution: Skid-mounted membrane or PSA nitrogen generators.
Benefit: Quick setup, safe inerting, and flexible deployment.
Application type (inerting, ventilation, process gas, drying)
Required flow (Nm³/h or scfm)
Purity or O₂ level specification (%)
Delivery pressure (bar/psi)
Duty cycle (continuous, batch, emergency)
Ambient & mine conditions (temperature, humidity, explosive gas concentration)
Installation constraints (underground, surface, footprint)
Safety and regulatory compliance requirements (ATEX, IECEx, local mine regulations)
Remote monitoring or integration needs
| Application | Flow (Nm³/h) | Purity / O₂ | Pressure | RICH solution |
|---|---|---|---|---|
| Conveyor / silo inerting | 50–500 | 95–99% N₂ | 1–6 bar | PNF / PNF+ PSA + buffer vessel |
| Underground refuge / ventilation | 10–100 | 20–21% O₂ | 0.5–3 bar | VPSA / POF oxygen plant |
| Dry gas for sensors / pneumatics | 5–50 | 95–99% N₂ | 0.5–6 bar | PSA + desiccant dryer |
| Emergency mobile inerting | 5–50 | 95–98% N₂ | 1–6 bar | Membrane or skid-mounted PSA |
Hazardous area approvals (ATEX, IECEx)
FAT/SAT verification for flow, purity, dew point, and safety interlocks
Documentation: P&ID, GA drawings, operation & maintenance manuals
Remote monitoring and automation-ready designs
Improved mine safety by reducing explosion risks
Reduced O₂-related hazards in storage and processing areas
Reliable gas supply reduces downtime
Eliminate cylinder logistics and emergency deliveries
Energy savings with optimized RL-VI or load-adaptation systems
Lower maintenance due to durable valves, towers, and cylinders
Q: Can N₂ purity be guaranteed for mine inerting?
A: Yes. PSA and membrane systems are designed for stable purity verified at FAT/SAT.
Q: Can systems operate underground with limited access?
A: Yes — skid-mounted or compact systems with remote monitoring reduce manual intervention.
Q: Are the systems suitable for hazardous areas?
A: Yes — we provide ATEX/IECEx certified packages.
Q: Can moisture-sensitive equipment be protected?
A: Yes — desiccant dryers and dew-point control ensure reliable gas quality.
