73 Mitigation of Methane Emissions from Coal Mine Ventilation Air Peter Carothers1 and Milind D. Deo2 1Alternative Energy Development, Inc., Silver Spring, MD, U.S.A.; 2Dept. of Chemical and Fuels Engineering, University of Utah, Salt Lake City, UT, U.S.A. ABSTRACT U.S. EPA's coalbed methane outreach program, (CMOP) has prepared a technical assessment of techniques that combust
Characteristics of coal mine ventilation air flows. Su S, Chen H, Teakle P, Xue S J Environ Manage, 86(1):44-62, 18 Jan 2007
Background. The main objective of an underground mine ventilation system is clear: to provide air flows in sufficient quantity and quality to dilute contaminants to safe amounts/concentrations where personnel are required to travel and work. This requirement is integrated into the mining law of those nations who possess that type of legislation. The degree of "quality' and "quantity" varies ...
Chapter 9 Mine Ventilation Systems Practical Mine Ventilation Engineering 6. Line Brattice/Vent Tubing As a short term measure, fire-resistant line brattices may be tacked to roof, sides, and floor in underground coal mines to provide temporary stoppings where pressure differentials are low in and around working areas.
The problem of automatic control of a coal mine ventilation network is discussed. It is found that the structure of the control sys- tem should have two levels, i.e. local regulation of ventilation para- meters (air flows) in faces to eliminate the effect of quick disturba- noes, and supervisory control of the whole ventilation process...
Due to the large flow, low concentration, low enrichment efficiency, potential safety hazards and the difficulty of comprehensive utilization, it is a big challenge for the development and application of enrichment and separation technology for coal mine ventilation methane (CMVM) at home and abroad. And many countries paid more and more attentions to resolve this problem.
1. Introduction. Airflow at the mining face and in the roadways of underground mines can be severely disrupted during coal and gas outbursts and may trigger secondary disasters, such as gas explosions,1, 2, 3 requiring that these impacts be defined.4, 5, 6 Normal ventilation airflow can be disrupted by the shock waves generated by coal and gas outbursts, potentially generating countercurrents ...
Best Practice Guidance for Effective Methane Drainage and Use in Coal Mines ECE ENERGY SERIES No. 47 Second edition December 2016
The flow characteristics of granular coal from a Plexiglass silo were investigated. Mass flow was observed when material level was at the cylindrical section in the experiment, while swirl flow when material level was at the conical section. ... - mine health and safety - ventilation and control, methane drainage and capture ... - low carbon ...
Coal and gas outbursts are dynamic failures that can involve the ejection of thousands tons of pulverized coal, as well as considerable volumes of gas, into a limited working space within a short period. The two-phase flow of gas and pulverized coal that occurs during an outburst can lead to fatalities and destroy underground equipment. This article examines the interaction mechanism between ...
When the dust Ventilation air flow, m3/s Mine C 420 ARTICLE IN PRESS S. Su et al. / Journal of Environmental Management 86 (2008) 44–62 61 1.8 CH4 concentration, % (vol.) 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 Mine D 240 220 200 180 160 140 120 100 Ventilation airflow, m3/s Mine daily production, t 0 0 0 0 0 0 0 0 0 0 0 0 0:0 0:0 0:0 0:0 0:0 0:0 0:0 ...
8 Methods for Protecting Coal Miners Intake air courses, which bring in fresh air to the working face Return air courses, which exhaust air from the working face The number of entries available for ventilation vary with the mining method used and the geological characteristics …
Mine Ventilation Systems Practical Mine Ventilation Engineering to be Published by Intertec Puslishing Co. Ventilation is the control of air movement, its amount, and direction. Although it contributes noth - ing directly to the production phase of an operation, the lack of proper ventilation often will cause
6/24/2016· 3. Ventilation 1) Background •The main objective of an underground mine ventilation system is clear: to provide air flows in sufficient quantity and quality to dilute contaminants to safe amounts/concentrations where personnel are required to travel and work. To Supply of oxygen men and machines; To Dilute toxic gas / explosive ...
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–§75.325 prescribes the required minimum air quantity for different coal types and mine locations. –§75.326 mandates that a mean entry air velocity of at least 60 feet per minute must reach each working face. Bituminous/Lignite Mines Anthracite Mines Working face where coal is being cut 3,000 1,500 Last open crosscut or end of pillar line
Characteristics of coal mine ventilation air flows. Su S(1), Chen H, Teakle P, Xue S. Author information: (1)CSIRO Exploration and Mining, P.O. Box 883, Kenmore, Qld 4069, Australia. [email protected] Coal mine methane (CMM) is not only a greenhouse gas but also a wasted energy resource if not utilised.
6.3 (i) Ventsim model design of the ventilation network of the coal mine 49 6.3 (ii) Simulated model design of the ventilation network of Nandira coal mine 50 6.4 Characteristics curve of MMV 51 6.5 Fan characteristic curve and operating point 51 6.6 Comparison of field studies and Ventsim results. 52
Chapter 4. Subsurface Ventilation Systems. Malcolm J. McPherson 3 Fresh air enters the system through one or more downcast shafts, drifts (slopes, adits), or other connections to surface. The air flows along intake airways to the working areas or places where the majority of pollutants are added to the air.
into the mine during coal extraction does not build to dangerous levels. This is accomplished in part through the use of large-volume ventilation systems that remove methane from the mine and release it to the atmosphere. Although the methane concentration exhausted is quite low (typically < 1%), the volume of air that ventilation
This paper reports the results of experimental investigation of flow resistance in a coal mine ventilation air methane preheated catalytic oxidation reactor. The experimental system was installed at the Energy Research Institute of Shandong University of Technology. The system has been used to investigate the effects of flow rate (200 Nm >3/h to 1000 Nm3/h) and ...
Characteristics of Coal Mine Ventilation Air Flows (Shi Su, 2006). Mine-specific characteristics and preliminary conclusions can be drawn from an assessment of 6-12 months of data. To illustrate the range and variability of methane concentrations in VAM at U.S. coal mines, CMOP compiled the results of weekly VAM measurements from four coal mines
4/17/2014· To prevent explosions during underground coal mining, mine shafts are continuously ventilated to dilute methane released from the coal seam to non-combustible concentrations (usually ≤1% v/v since the lower flammable limit of methane is 5% (v/v) in air). The mine ventilation air (MVA) is then released untreated into the atmosphere causing ...
1. Introduction. Coal mine methane (CMM) is not only a greenhouse gas but also a wasted energy resource if not utilised. In 2000, it was estimated that the world total of methane emitted from mine ventilation air was over 237 Mt CO 2-e, and that ventilation air methane (VAM) derived power projects could theoretically create 3GW e of net usable capacity (US EPA, 2003).
Atkinson resistance is commonly used in mine ventilation to characterise the resistance to airflow of a duct of irregular size and shape, such as a mine roadway. It has the symbol and is used in the square law for pressure drop, = where (in English units) . is pressure drop (pounds per square foot), is the air density in the duct (pounds per cubic foot),; is the standard air density (0.075 ...
Characteristics of coal mine ventilation air flows. - NCBI. J Environ Manage. 2008 Jan;86(1):44-62. Epub 2007 Jan 18. Characteristics of coal mine ventilation air flows…