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Long single entry controlled loop ventilation mathematical model

Author: TianMin
Tutor: XieXianPing
School: Kunming University of Science and Technology
Course: Safety Technology and Engineering
Keywords: Long single entry Controlled circulating ventilation Mathematical model Proliferation Purification efficiency Self-purification
CLC: TD724
Type: Master's thesis
Year: 2008
Downloads: 44
Quote: 0
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Abstract


Long single entry ventilation problem has been the impact of the mine construction progress and construction workers safe and healthy important factors that need to be urgently addressed. Long time, people have always thought that the circulating air is harmful, not helpful, but according to some scholars at home and abroad, as long as the correct control loop ventilation can be used to solve some ventilation problems far away from the wellhead area. The foreign part mine circulating air has proven this point. Thus study circulating ventilation used in the the long blind roadway ventilation has important practical significance. Article from the theoretical model of pollutant concentration of circulating ventilation. The mathematical model of the first cycle ventilation is to prove the feasibility of a circulating ventilation on the basis of previous studies, the analysis of the turbulent state, the process of closed-circuit circulation ventilation and open circuit circulation ventilation under different conditions. Changes in quality of pollutants relationship come about the time change of the mathematical model, the pollutant concentration, and the relationship between the various factors to establish a trend graph analysis shows the following conclusions: (1) Face The air volume is reduced as the purification efficiency is increased. (2) the case of the same work amount of wind, the purification efficiency is increased with increasing cycle rate. (3) Ventilation time decreases with the increase in the purification efficiency and the cycle rate. The second model is the establishment of a two-dimensional mathematical model, The controlled circulation ventilation pollutant concentration is not only change over time, and the mathematical model with the two-dimensional space changes. This is no precedent in the model analysis. Start with the gas diffusion differential equations of the model starting the diffusion concentration model, and in the first model based on the model of gaseous pollutants in the case of whether the macro-mainstream sports, the last Long Blind roadway controlled circulation ventilation were established concentration model, and reached the following conclusions: (1) installation of circulating air for the face, its essence is the same. (2) For a single pressure, single withdrawable and a single press-through circulating ventilation, as long as the condition is satisfied QR of ≥ 4KES / L, pressure pumping mixing cycle ventilation to meet the condition Qr ≥ 4KES/LF fully able to ensure the concentration of the pollutant continue to reduce, to accelerate the dilution diffusion. (3) long single entry for the gun smoke circulating ventilation, regardless of the cycle coefficient equal to or less than 1, will accelerate the proliferation of gun smoke. The third model is based on controlled cycles as the concentration of the parameter model. The model for the study of the dust after blasting, dust self-purification of circulating ventilation, combined with the collection efficiency and diffusion efficiency for concentration analysis. Draw a model with cycle rate of dust concentration, purification efficiency, exponential change in the diffusion efficiency and self-purification efficiency, and the number of cycles for the index. This article Although the topic is a study on the long blind roadway circulation ventilation model, but it is only the beginning of the subject, need more in-depth research.

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CLC: > Industrial Technology > Mining Engineering > Mine safety and labor protection > Mine ventilation > Ventilation system, ventilation and equipment
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