What is splitting in mine ventilation?
Split-Mine Ventilation Of the three ventilation methods, split-mine ventilation is. the simplest in terms of layout and design, as the mine is split. into separate intake and exhaust sides.
What is the face of a coal mine?
In mining, the face is the surface where the mining work is advancing. In surface mining it is commonly called pit face, in underground mining a common term is mine face.
What is mine ventilation system?
A mine ventilation system provides fresh air flow into the underground mine and expels contaminated air out of the underground mine.
Why ventilation is required in a mine?
For example, diesel-powered equipment is important in many mining systems, and fresh air is required both for combustion and to dilute exhaust contaminants. In addition, when explosives are used to break hard rock, ventilation air carries away and dilutes the gases produced.
What are the standards of ventilation?
ASHRAE (formerly called the American Society of Heating, Refrigerating and Air-Conditioning Engineers) recommends (in its Standard 62.2-2016, “Ventilation and Acceptable Indoor Air Quality in Residential Buildings”) that homes receive 0.35 air changes per hour but not less than 15 cubic feet of air per minute (cfm) per …
What is auxiliary fan in mining?
Secondary or Auxiliary Fans are smaller, portable fans used to supplement the primary fan ventilation. They are installed underground for ventilating mines that are not adequately ventilated by the air current produced by the primary mine ventilation fans. An auxiliary fans is usually from 0.5 to 1.0m in diameter.
What is bord and pillar mining method?
A system of mining in which the distinguishing feature is the winning of less than 50% coal on the first working. It is more an extension of the development work than mining. The second working is similar in principle to top slicing.
How much does a longwall cost?
Today, longwall has evolved into the most modern, efficient, and safe mining technique going. It is also the most expensive. A single system designed to clear out a 600 -by-6,000-foot seam that is 5 feet thick costs from $6 million to $8 million, generally limiting its use to the larger coal companies.
What is the main purpose of mine ventilation?
Ventilation systems are critical to ensure safe working conditions for our people underground. They provide fresh, cool air, and dilute and remove flammable gases as well as machine exhaust gases.
Why is ventilation important in mining?
Ventilation is an important aspect of underground mine operations, providing fresh air to miners while diluting or removing hazardous from mine workings.
Why ventilation control of dust in coal mines is important?
Ventilation control of dust in coal mines is important in the different types of underground coal mining such as (1) room and pillar mining, (2) longwall mining and (3) shaft mining. Type (1) is done in an ore deposit where some of the ore is left behind to form columns in the mine that prevents it from collapsing and it is used for coal mining.
What is the working face of a coal mine?
Background of mine and longwall working face The studied coal working face is a fully-mechanized top coal caving working face which is also the first mining face in this coal mine and the annual coal production of the mine is 900,000 tons/year. The gas content of this face is 35.04 m 3 /t and the gas emission rate is 104 m 3 /min.
What is the gas content of the coal working face?
The studied coal working face is a fully-mechanized top coal caving working face which is also the first mining face in this coal mine and the annual coal production of the mine is 900,000 tons/year. The gas content of this face is 35.04 m 3 /t and the gas emission rate is 104 m 3 /min.
What is the minimum amount of ventilation required for a coal mine?
The quantity of air reaching each working face where coal is being cut, mined, drilled for blasting, or loaded shall be at least 3,000 cubic feet per minute unless a greater quantity is required in the approved ventilation plan.