• Mine Ventilation
• Mine Ventilation Fans

Design and operational aspects in the use of booster, circuit and auxiliary fan systems D.J. Nixon Mine Ventilation Australia.

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Mine Ventilation

Schematic of underground mine ventilation Underground mine ventilation provides a flow of air to the of a mine of sufficient volume to dilute and remove dust and gases (typically, and ) and to regulate temperature. The source of these gases are equipment that runs on, blasting with, and the orebody itself. The largest component of the operating cost for mine ventilation is to power the ventilation fans, which may account for one third of a typical underground mine's entire electrical power cost. Contents. Types of ventilation Flow-through ventilation is the main ventilation circuit for the mine.

Air enters the mine from surface via a,. The air is distributed through the mine via internal ventilation raises and ramps, and flows are controlled by regulators and permanently mounted ventilation fans. An auxiliary ventilation system takes air from the flow-through system and distributes it to the mine workings via temporarily mounted ventilation fans, venturies and disposable fabric or steel ducting. Auxiliary fan and duct systems may be either forcing systems, where fresh air is pushed into mine headings, or exhausting systems that draw out contaminated air. Ventilation control Sufficient volume of air is required for proper ventilation. A bulk of electric power is required for driving fans. By installing variable speed control air quantity can be optimized hence the power.

Mine Ventilation Fans

At every place in the mine where persons are required to work or pass, the air does not contain less than 19% of oxygen or more than 0.5% of carbon dioxide or any noxious gas in quantity likely to affect the health of any person; the percentage of inflammable gas does not exceed 0.75% in the general body of the return air of any ventilating district and 1.25% in any place in the mine; Regulations The volume (expressed in or ) of air required to ventilate an underground mine is determined by based on a wide variety of parameters. In most countries minimum requirements are outlined by law, regulation or standards. However, in some developing countries the mandated ventilation requirement may be insufficient, and the mining company may have to increase the ventilation flow, in particular where ventilation may be required to cool the ambient temperature in a deep hot mine, however auto-compression must also be taken into account.

As per CMR 130-2-(i) in every ventilating district, not less than six cubic metres per minute of air per personemployed in the district on the largest shift or not less than 2.5 cubic metres per minute of air per daily tonne output whichever is larger, passes along the last ventilation connection in the district which means the inbye-most gallery in the district along which the air passes; Heating In ventilation air may need to be heated during winter months. This will make the working environment more hospitable for miners, and prevent freezing of workings, in particular water pipes. In mines where the mining horizon is above the heating may not take place to prevent melting the permafrost. 'Cold mines' such as and are designed to operate below 0°C. The in any working place does not exceed 33.5°C and where the wet bulb temperature exceeds 30.5°C arrangements are made to ventilate the same with a current of air moving at a speed of not less than one metre per second; References.