Answer: (1) The model and number of air compressors and air supply systems with different air qualities and pressures should be determined based on the air supply requirements and compressed air load after technical and economic scheme comparison. In a compressed air station, the number of air compressors should be 3 to 6; for air supply systems with the same quality and pressure, the models of air compressors should not exceed two.
(2) The spare capacity of the compressed air station shall meet the following requirements according to the load and system conditions:
1) When the largest unit is under maintenance, the exhaust volume of the remaining units shall ensure the gas volume required for the production of the entire plant (mine), except that the gas supply can be reduced through allocation measures;
2) When the gas volume required for production cannot be guaranteed after allocation and equipment units are required, an air supply system with 5 or less air compressor units can add one as a spare;
3) For decentralized compressed air stations with interconnected pipelines, their spare capacity should be set uniformly;
4) For air supply systems with two pressures, the unit of the higher pressure system should be used as the spare unit of the low pressure system;
5) For station buildings with both oil and oil-free models, oil-free air compressor units should be used as spares.
