What is the appropriate pressure for mine air compressor?

Guide for Pressure Selection of Mine Air Compressor

The mining operating environment is complex, and the pressure selection of air compressors requires comprehensive consideration of process requirements, equipment matching and safety regulations. The following are the core principles and suggestions for pressure selection from the perspective of technical logic and practical application:

1. The core basis for pressure selection

1. Gas equipment demand

   • Drilling and blasting: Equipment such as drilling rigs and down-the-hole drills usually require a pressure of 0.7-1.3MPa, depending on the hardness of the rock formation and the depth of the borehole.
   • Ventilation and dust removal: The pressure requirements of local fans and spray dust suppression systems are low, generally 0.4-0.8MPa can be met.
   • pneumatic tools: For example, air pickles, pneumatic wrenches, etc., the pressure requirements are mostly between 0.6 and 1.0MPa.

2. Gas pipeline loss
   When transporting gas over long distances, pressure losses will occur due to pipeline friction, elbows and valves. It is recommended to reserve a pressure margin at 10%-20% of the actual gas transmission distance to ensure that the terminal equipment obtains a stable gas source.

3. Safety redundancy design
   The mining operating environment is harsh, and equipment needs to have certain pressure redundancy to cope with sudden loads. However, the redundancy value should not be too high to avoid waste of energy efficiency or the risk of pipeline overpressure.

2. Economic balance of pressure selection

1. Contradiction between energy efficiency and cost
   • High-pressure models: Although it can meet the needs of multiple scenarios, it consumes high energy and increases long-term operating costs.
   • Low voltage model: Excellent energy efficiency, but insufficient pressure may lead to frequent equipment shutdowns or reduced efficiency.
2. partial pressure gas supply system
   For mines with large differences in gas pressure, a “high pressure + low pressure” dual system design can be adopted. For example:
   • The high-pressure system (1.0-1.3MPa) is specially used for drilling equipment.
   • Low pressure system (0.4-0.8MPa) is used for ventilation, dust removal and pneumatic tools.

3. Practical suggestions for pressure selection

1. On-site working conditions test
   Before type selection, pressure testing should be carried out for mine gas equipment to record the fluctuation range of actual demand to avoid deviations between theoretical values and actual values.

2. Consulting professional institutions
   Combined with the scale of the mine, geological conditions and operating intensity, a professional organization is entrusted to conduct pressure calculation and equipment matching evaluation.

3. Focus on safety regulations
   The pressure setting must comply with standards such as the “Safety Regulations for Metal and Non-Metal Mines” to avoid pipeline rupture or equipment damage caused by overpressure operation.

conclusion

The pressure selection of mine air compressors must be based on the actual gas demand, taking into account energy efficiency, safety and economy. It is recommended to determine the optimal pressure range through on-site testing, professional calculation and specification verification. For large mines or complex working conditions, the use of partial pressure gas supply systems can significantly improve energy efficiency and operational stability.