1 Mines with deeper burial, shorter strikes and more concentrated distribution;
2 The ore bodies are relatively scattered and long-term, and each mine section is convenient for excavating the mines of the return air wells.
A centralized ventilation system that uses multiple machines operating in parallel in different wellbores shall comply with the following regulations:
1 When one main fan is running, other main fans should be started freely, and the wind flow in each main fan load area should be stable; when one main fan is out of service, its ventilation and dirty air should not flow into other main fan ventilation areas;
2 When multiple wells are ventilated, the working surface between the wellbore shall not form a stagnation zone;
3 The resistance of each main fan ventilation area should be equal.
This category is a range of picnic mats, our products are of high quality, easy to carry, available in a variety of
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Picnic mats, also known as picnic rugs, multifunctional blankets, and cushions, are a kind of fleece (or acrylic)
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Ningbo Autrends International Trade Co., Ltd. , https://www.outerlead.com