The characteristics of mine ventilation air flows including variations of methane concentration and flow rate, etc. can be seen in Refs. [3], [9] . To recover heat for power generation, supplementary fuel is required to bring the CH 4 concentration up to a constant level required by the thermodynamics of a power generation system.
trace amounts of coal mine methane contained in ventilation air. Control of methane emissions from mine ventilation sys tems has been an elusive goal because of the magnitude of a typical airflow and the very low methane concentrations. One established and cost-effective use feeds the air into a prime mover in lieu of ambient combustion air.
Considering the coal and gas outburst phenomenon in the mining space, this paper analyzes the main characteristics of coal and gas outburst accidents, defines the outburst airflow reversal degree, and constructs a simplified topology graph of tunneling ventilation system, while the air door is not destroyed. Using the numerical simulation method, this paper …
Therefore, this paper presents mine-site experimental results on the characteristics of mine ventilation air flows, including methane concentration and its variations, dust loadings, …
The characteristics of ventilation air flows were determined for four mines, and an attempt was made to determine ventilation air quality requirements (dust loading, gaseous contaminant …
Therefore, this paper presents mine-site experimental results on the characteristics of mine ventilation air flows, including methane concentration and its …
Model NO.: GAL-12-450 Material: Aluminum Usage: for Manufacture Flow Direction: Axial Flow Pressure: Medium Pressure Certification: RoHS, UR, ISO, CE, CCC
Ventilation plays an important role in the spontaneous heating of coal in an underground coal mine. If the ventilation rate is too high, heat is carried away by convection. If the ventilation rate is too low, the reaction rate becomes oxygen-limited. The effect of ventilation on the spontaneous heating of coal was investigated in an isothermal ...
The U.S. Department of Energy's Office of Scientific and Technical Information
Figure 1: CMM emissions from underground coal mines in the United States from 2011-2015 . Source: Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2015 . This report is an update of EPA's 2010 publication, U.S Underground Coal Mine Ventilation Air Methane Exhaust Characterization. 4. This update can be used in conjunction with ...
The coal mine fan has a good reverse air supply performance (that is, the reverse air is easy), and the return air volume can reach 60% - 70% of the supply air volume. Because the coal mine fan can use the reverse air of the motor, neither the diffuser and diffusion tower, nor the fan room and the reverse air duct need to be built, the ...
The main conclusions of this paper are as follows: 1. The generated mechanism of the recirculation zone in the open-pit mine is the pressure discrepancy in the flow field. As the air pass through an open-pit mine, the gas in the pit will flow in the same direction, and a low-pressure area will be formed in the mine.
2.1 Analysis of airflow movement characteristics in roadway. The flow state of airflow in shaft and roadway can be divided into two kinds, namely laminar flow and turbulent flow. In coal mine ventilation, a dimensionless coefficient ... Due to the accumulation of all kinds of equipment or other obstacles in coal mines, the air flow is in an ...
It is an ideal equipment for local ventilation in coal mines. Product advantages: 1. It is not necessary to connect pipes, install conveniently, change the direction of air flow freely, rely on relay transmission and induction of air, 2. The sound insulation material is used to reduce the sound of the fan, so it has high efficiency, low noise ...
The characteristics of ventilation air flows were determined for four mines, and an attempt was made to determine ventilation air quality requirements (dust loading, gaseous contaminant limits etc.) for the major existing and developing VAM mitigation and utilisation technologies. ... In the Australian coal mining industry, most guidelines for ...
Coal mine ventilation air contains appreciable amounts of methane, but also water that undoubtedly affects the catalytic combustion of methane and, consequently, the operation of catalytic reverse flow reactors. The aim of this study is to get new insights on the influence of this water on the operation of catalytic reverse flow reactors.
Regarding mine ventilation in a tunnel with one mining face, the turbulent flow structure and Mean age of air (MAA) of fresh air discharged from the ventilation ducts are numerically studied using the commercial CFD code, ANSYS CFX 17.0. The characteristics of the three-dimensional turbulent transport and fluid age are considered to provide new insight …
No matter what technologies have been/are being developed for the ancillary and principal uses of VAM, an important issue related to the implementation of these technologies at mine sites has been ignored, namely the characteristics of the mine ventilation air flows. The characteristics, including dust loading, particle size, mineral matters of ...
No matter what technologies have been/are being developed for the ancillary and principal uses of VAM, an important issue related to the implementation of these technologies …
Determining the influence scope of the airflow disorder is an important problem after coal and gas outburst accidents in ventilation systems. This paper puts forward the indexes of airflow disorder, including the length of the excavation roadway, the outburst pressure, the pressure difference of the air door, and the air quantity of the auxiliary fan. Using the …
Flow streamlines, velocity vectors, MAA, eddy viscosity, and total pressure in the tunnel of a mine with ventilation ducts are presented. The variation in the MAA with the angle, …
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) …
Characteristics of coal mine ventilation air flows. J. Environ. Manag., 86 (2008), pp. 44-62. Article Download PDF View Record in Scopus Google Scholar. 3. ... Characteristics of coal fractures and the influence of coal facies on coalbed methane productivity in the South Yanchuan Block, China. J. Nat. Gas Sci. Eng., 22 ...
The designs for the ventilation duct are optimized by conducting a parametric analysis of MM according to the different scenarios provided in this study. The results …
A coal mine's potential for a VAM project can be assessed initially from its average annual ventilation air flow and the methane concentrationin the ventilation air. Ventilation air flow measurements typically do not vary greatly because they are a function of the size and capacity of the ventilation fan. While the actual flow can be measured ...
