Mine, the causes of natural thermal potential difference in return air in main shaft and its influence on mine ventilation system and the control methods.
阐述了造成主井回风的自然热位差产生原因和对通风系统的影响，以及治理办法。
The importance for the mine to strengthen the maintenance of the air return way and the points needing attention in designing and allocating the ventilation shaft are pointed out.
同时提出生产矿山加强回风道维护的重要性，以及在设计和布置通风井时应注意的问题。
The design of the Buddha in the central depression Waida a new shaft into the return air.
设计在井田中部佛洼新建一进回风立井。
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