Experimental Study And Application Of Equivalent Wind Rresistance Of Mine Damper

Mine ventilation plays a decisive role in mine safety production.The damper is the most important ventilation structure in mine ventilation system.It is the most basic means to realize the distribution of mine air volume on demand and the adjustment of ventilation network.It is the stability and ventilation of air flow.An important factor in the reliability of the system.In this paper,the experimental research on the equivalent wind resistance of mine damper is carried out,and the relationship between the air leakage and the pressure difference of the damper is obtained.Then the existing ventilation network solving algorithm is improved,and it is expected to obtain the calculation result more in line with the actual situation.And ventilation system optimization has important theoretical and practical significance.The thesis uses the experimental platform built by itself to construct the simulation damper for experimental testing.By adjusting the pressure difference between the two ends of the damper,the air leakage of the damper under different pressure difference conditions is obtained,and the variation law of the equivalent wind resistance between the damper air leakage and the damper pressure difference is obtained.Through experimental test data analysis,the plenum leakage volume and the damper pressure difference are in exponential function relationship,and the airflow Q-wind pressure H curve under different air leakage types and air leakage area is obtained.The experiment shows that under the premise of the same air leakage area,the relationship between the wind pressure difference at the two ends of the damper and the air volume passing through the damper is independent of the type of air leakage of the damper.The b value is basically the same under different air leakage types,indicating the b value.The size is independent of the air leakage type of the damper;fitting the air volume Q and the wind pressure H curve under different air leakage areas,the b value is related to the air leakage area,and within a certain air leakage area ratio,the b value increases with the air leakage area.Gradually decrease;finally,the formula for calculating the equivalent wind resistance of the damper in the range of different air leakage area ratio is obtained.Based on the equivalent wind resistance calculation formula obtained in the previous stage,the existing Cross ventilation network solving algorithm is improved,and an improved algorithm for network solution with equivalent wind resistance of the damper is formed.The specific method is to summarize and summarize the equivalent wind resistance function relationship of the common damper in the mine,and participate in the original Cross method network solution algorithm.In the iterative solution process,the air volume will change continuously with the iterative cycle until Convergence,thus forming a network solution algorithm with damperequivalent wind resistance.By solving the parallel and angular joint network examples,the improved airflow of the damper is smaller than the traditional algorithm.The improved algorithm not only reduces the error of the traditional algorithm,but also solves the wind volume value more in line with the actual situation.There are 37 figures,9 tables and 64 references in this paper.