Calculation of Air Flows Stability in the Mine Workings by the Factor of Thermal Depression in the Analytical Complex «Aeroset»

2020 ◽  
pp. 24-32
Author(s):  
M.D. Popov ◽  
◽  
D.S. Kormshchikov ◽  
M.A. Semin ◽  
L.Yu. Levin ◽  
...  
Keyword(s):  
Air Flow ◽  
Ventilation System ◽  
Numerical Algorithms ◽  
Mine Ventilation ◽  
Heat Emission ◽  
Graphical Analysis ◽  
Ventilation Network ◽  
Mining Operations ◽  
Mine Workings ◽  
The Stability

Underground fires are one of the most serious emergencies that occur during mining operations. Analysis of possible scenarios for its development is a mandatory measure when designing new mine workings and when developing a plan for immediate elimination of accidents at the existing mine workings. The main danger that an underground fire creates for the mine ventilation system is a change in the ventilation mode and, accordingly, a change in the direction of movement of the air and harmful gases released during combustion. It is almost impossible to calculate in manual mode all the possible scenarios for the development of an emergency for different places where underground fires occur. This confirms the need to develop algorithms for automated assessment of the effect of thermal depression from a fire on the stability of the air flow in all mine workings of the mine ventilation network. The authors consider two numerical algorithms implemented in the «Aeroset» analytical complex and solving two independent problems. The first of them is determining the air flow stability in the mine on the whole in the presence of a fire of a given heat emission rate in any place of the mine working. The second task is to find the critical rate of fire heat generation in stationary workings, leading to a loss of stability of the air flow in the mined-out spaces of the mine. The techniques of increasing the speed of calculations of algorithms are studied. The article also describes the developed tools for graphical analysis of the calculation results. Examples of using such tools in practice are given. It is concluded that the developed software tools allow to quickly model the stability of air distribution in the mine ventilation networks of arbitrary topology in the presence of underground fires, and conveniently visualize the calculations.

Application of Fuzzy Mathematics in Selection Air Flow Regulating Program

2013 ◽  
Vol 423-426 ◽  
pp. 2291-2296
Author(s):  
Wei Wei Ye ◽  
Xian Ping Xie ◽  
Meng Wei Han ◽  
Shi Yun Luo ◽  
Zhen Li ◽  
...  
Keyword(s):  
Air Flow ◽  
Ventilation System ◽  
Mine Ventilation ◽  
Practical Significance ◽  
Ventilation Network ◽  
The North ◽  
Regulation Scheme ◽  
Controlling System ◽  
North Part ◽  
Optimal Tree

Selecting the optimal air regulation scheme of mine ventilation network, the essence is to choose the network a most optimal tree and obtain the corresponding optimal cosine tree combination program.Due to a synthetic consideration of the influence of production.Management economy and other aspects on the tree selection,the air flow regulating and controlling system made by the authors is optimum It is satisfactory to use the model for the north part ventilation system of Laochang tin mine of Yunnan tin Industrial crop. It is of practical significance to combine organically air flow regulating and controlling system with mine ventilation system.

scholarly journals Increase of energy efficiency of mine fans work on a mine vent network

2019 ◽  
Vol 109 ◽  
pp. 00012 ◽  
Author(s):  
Tetiana Bunko ◽  
Maksym Shyshov ◽  
Oleksandr Bokii ◽  
Anatolii Belikov ◽  
Oleksandr Zhalilov ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Mutual Influence ◽  
Air Flow ◽  
Ventilation System ◽  
Mine Ventilation ◽  
Operating Conditions ◽  
Ventilation Network ◽  
Work Efficiency ◽  
Aerodynamic Quality

The increase of energy efficiency of main fans (MF) work is the basic condition of perfecting the mine ventilation system. During realization of multi-fan ventilation there is the non-productive «overbalancing» of vent flow from a weaker towards more powerful ventilator which causes decline of work efficiency of both. The questions of reducing the MF mutual influence on the outgoing air flow and increasing the aerodynamic quality of vent network have been studied and considered insufficiently. It is proposed to use the method of calculating the effective MF operating conditions taking into account the mutual influence of MF and areas-users of fresh air in mine ventilation network and on the basis of criterion of estimating the MF mutual influence, which will allow to enhance the energy efficiency of mine ventilation and labour safety of subsurface miners.

scholarly journals Optimization of the ventilation scheme for increasing production capacity of underground mines

2022 ◽  
pp. 89-93
Author(s):  
N.D. Iliinov ◽  
A.M. Mazhitov ◽  
A.B. Allaberdin ◽  
K.V. Vazhdaev
Keyword(s):  
Flow Rate ◽  
Underground Mining ◽  
Critical Path ◽  
Air Flow ◽  
Ventilation System ◽  
Production Capacity ◽  
Underground Mines ◽  
Air Flow Rate ◽  
Mining Operations ◽  
Mine Workings

Currently, many underground mines are revising their design solutions to increase their production capacity. This tendency is explained by the decreasing ore grades, as well as by the extensive introduction of mechanization in underground mining operations that has improved the output of mobile equipment by increasing the box capacity and engine power. Dieselpowered mobile vehicles are the most common in underground mining practice. The advantages of such engines are obvious as they generate more power than other types of engines. However, the high air demand for mine ventilation limits their application. This is associated with the need to increase the cross-sections of permanent mine workings in order to comply with the standard air flow rate with account of the increased ventilation capacity along with an increase in the inventory of mobile equipment in order to ensure the specified output of the mine. The specific features of mining operations are defined by the stage-wise character of commissioning various blocks of the deposit. Managing of production and development works provides an opportunity to ventilate the mine sections due to their consecutive commissioning, locally, with an isolated stream of air by means of mine workings that do not have the intersection of air streams. This provides a reduction of critical path of air travel up to 30% and reduction of the general mine ventilating pressure drop by at least 20% at constant air flow rate. The results of the work can be used in designing the ventilation system of underground mines both under construction and in operation.

Local Natural Ventilation Registration while Ensuring Aerological Safety at the Mining Enterprises

2021 ◽  
pp. 60-65
Author(s):  
S.S. Kobylkin ◽  
◽  
V.M. Khubieva ◽  
Keyword(s):  
Calculation Method ◽  
Natural Ventilation ◽  
Three Dimensional ◽  
Field Measurements ◽  
Industrial Safety ◽  
Ventilation Network ◽  
Negative Consequences ◽  
Practical Application ◽  
Mining Operations ◽  
Mine Workings

Safety of mining operations is the basis for the efficient functioning of the mines. During mining operations, due to changing conditions in the mine workings, the natural draft began to appear more frequent. Moreover, its influence can be limited to a separate section without affecting the entire ventilation network. In this paper, the new concept is introduced and explained — local natural ventilation. The classification signs and the negative consequences of its manifestation are presented. Main difference between the local natural ventilation as a subspecies of natural ventilation as a whole lies in the limited action both in the spaces of mine workings or individual sections, and in time. Particularly its occurrence depends on the season or the technological processes performed. In this case, the local natural ventilation is not an emergency and is not subject to registration as an incident or accident. However, its manifestations can lead to both incidents and accidents. Taking this factor into account will allow to increase the level of aerological safety at the mining enterprises. A method of three-dimensional computer modeling is proposed for predicting the manifestation of local natural ventilation and making decisions to prevent it. An example of the use of this approach at the Norilsk mine during the construction of shafts with verification of field measurements is given. It confirms the possibility of practical application of the proposed calculation method. The algorithm for registering the local natural ventilation considered in the article makes it possible to develop activities for improving the level of industrial safety at the mining enterprises as a whole.

Analysis on the Stability of Yaoqiao Coalmine Ventilation System

2011 ◽  
Vol 402 ◽  
pp. 622-625
Author(s):  
Gen Yin Cheng ◽  
Kai Sun ◽  
Bo Li ◽  
Kai Zhu ◽  
Hong Zhang Yao ◽  
...  
Keyword(s):  
Ventilation System ◽  
Mine Ventilation ◽  
System Stability ◽  
System Quality ◽  
Safety Index ◽  
Safe Production ◽  
Important Index ◽  
Safety Production ◽  
The Stability

The stability of mine ventilation system has a significant impact on coalmine safety production. It is not only an important index of ventilation system quality, but also an important safety index of coalmine. The author made an analysis of ventilation system stability on the basis of test on Yaoqiao coalmine ventilation system resistance and indicated that the ventilation system of this coalmine existed some problems, which had an important meaning for enhancing the management of mine ventilation system and directing the normal, safe production.

scholarly journals ESTIMATION OF AMOUNT CHANGING OF LOCAL AERODYNAMIC RESISTANCE OF ELEMENTS OF VENTILATION SYSTEM OF MINE AT REVERSING BEHAVIOR OF VENTILATION SYSTEM

2019 ◽  
Vol 2 (4) ◽  
pp. 212-219
Author(s):  
Stanislav Pavlov
Keyword(s):  
Ventilation System ◽  
Aerodynamic Resistance ◽  
Mine Ventilation ◽  
Ventilation Network ◽  
Work Study ◽  
Finite Element Software ◽  
Emergency Ventilation ◽  
Study Results ◽  
Aerodynamic Parameters ◽  
Junction Angle

In the work study results of influence of typical working junction angle on amount changing of local aerodynamic resistances when air flows in different directions is represented. Using finite-element software, aerodynamic parameters of elements of mine ventilation network is obtained and is compared with analytical calculations Interinfluence local aerodynamic resistances located at ventilation network consecutively in normal and reversing behavior is discovered. It allows to increase accuracy of calculation of mine ventilation network at emergency ventilation operation.

scholarly journals Applied Research of U-Shape Ventilation Network in Underground Mine/Badania Stosowane Sicie Wentylacyjnej W Kształcie „U” W Kopalni Podziemnej

2014 ◽  
Vol 59 (2) ◽  
pp. 381-394
Author(s):  
Haoran Zhang ◽  
Lluis Sanmiquel Pera ◽  
Vintro Sanchez Carla ◽  
Yaojiang Zhao
Keyword(s):  
Experimental Data ◽  
Wind Velocity ◽  
Applied Research ◽  
Ventilation System ◽  
Mine Ventilation ◽  
Ventilation Network ◽  
Volume Distribution ◽  
Dynamic Similarity ◽  
Air Volume ◽  
Selection Of

Abstract For the purpose of fully and systematically observe, research and optimize the U-sharp ventilation system in Vilafruns mine, a simulation model based on the principles of geometric, kinematic and dynamic similarity is established in the simulation laboratory. By simulating a U-shape ventilation network, t he air volume distribution and wind velocity in different sections of the model were measured and compared with practical data obtained in Vilafruns mine. Results show that the lowest wind velocity in the model is higher than 0.42 m/s, thus it is in a turbulent f low state, which satisfies the kinematical and dynamic similarity principles. T he characteristic of air volume distribution and wind velocity in Vilafruns mine are basically simulated by the experimental model through the obtained data and figures, which reflects the establishment of the model is correct and successful, and the experimental data is accurate and reliable. Moreover, this model provides useful references for the selection of mine ventilation types and for the optimization of the existing ventilation network.

An application of thermal exermal analysis to the development of mine cooling systems

2002 ◽  
Vol 216 (8) ◽  
pp. 845-857 ◽  
Author(s):  
C T Twort ◽  
I S Lowndes ◽  
S J Pickering
Keyword(s):  
Water Distribution ◽  
Cooling System ◽  
Ventilation System ◽  
Cost Effective ◽  
Mine Ventilation ◽  
Distribution Networks ◽  
Ventilation Network ◽  
Generic Model ◽  
Cooling Systems ◽  
Chilled Water

The extraction of minerals and coal at greater depth, employing higher-powered machinery to improve production levels, imposes an increased burden on the ability of a ventilation system to maintain an acceptable mine climate. Hence, mechanical mine cooling systems are often adopted, which can be expensive both in terms of their associated capital and operating costs. Consequently, in order to optimize the costs it is essential to provide the mine operator with a method with which to determine the most cost effective and efficient mine cooling system. The following paper overviews the development of a novel approach to the energy analysis of mine cooling systems using the concepts of thermal exergy analysis. Generic model mine ventilation networks are constructed and the subsurface environments of these mine networks predicted. Models of various cooling system methods are developed and applied to control the underground climate within these mine networks to within pre-set climatic limits. The exergy transfers that are produced by the application of the different cooling methods are compared using performance indices. Models to represent chilled water distribution networks, used to supply the air coolers within the various cooling systems, are designed and balanced. The results of the exergy analyses applied to the operation of the various chilled water pipe networks are discussed and used to assess the exergetic performance of the application of each cooling system to the mine ventilation network.

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