Study On Optimal Structure And Local Resi-Stance Coefficient Of Mine Double-Wall Fan Station

For the production of mining enterprises,ventilation system can effectively ensure the safety of its production,but also related to the sustainability of the entire production process.Multi-fan multi-stage fan station is characterized by less air leakage,high efficiency,and low energy consumption.It has a bright future and can be applied to further promotion.Each station comprises a plurality of fans,and the number of fans can be reasonably selected according to the specific demand of air volume.At present,the unreasonable structure of underground fan station in many design processes brings great resistance to the working face.Firstly,this paper summarizes the current research situation at home and abroad.Secondly,on the basis of the previous research results,the theoretical analysis of the resistance characteristics and the influencing factors is made to solve the problem of excessive local resistance in the application of double-wall fan station,the composition of the factors affecting the local resistance of the double-wall double-fan station and the triple-fan station is obtained,and the calculation method of the local resistance coefficient is also given.On the basis of the study of ventilation theory and fluid similarity theory,a similar experimental model is built based on the actual size of the turbine station,and the model is tested for ventilation and fan stability,at the same time,the wind pressure loss rate and the local resistance coefficient can be used to express the local resistance of the power station.In the similar experiment of double-fan and double-wind wall,the method of selecting the length of diaphragm and the optimal combination of tunnel structure parameters are studied.In the similarity experiment of three-fan double-wall,the optimal stagger distance between the upper and lower wind walls and the optimal combination of tunnel structure parameters are mainly studied,the experimental method and factor selection is similar to the Double Fan and Double Wall Fan Station experiment.Finally,the simulation software Fluent is used to verify the results of the similar experiment,which ensures the accuracyand reliability of the similar experiment results.The results show that:(1)the length of the guide airflow partition should be selected reasonably according to the wind speed of the roadway in the double-fan and double-wall fan station.(2)the tunnel structure of double-fan and double-wall fan station with the least local resistance is set as 60 degree of diffusion angle,30 degree of contraction angle,9m long of inlet tunnel and 10 m long of outlet tunnel.(3)the distance l between upper and lower wind walls is independent of the wind speed in the tunnel,and it is 4d all the time.(4)the tunnel structure of the fan station with double wind walls and three fans with minimum local resistance is 60 degrees of diffusion angle,5m of entry tunnel length,30 degrees of gradual shrinkage angle and 8m of exit tunnel length.The research results provide a new reference for the optimization and reconstruction of underground fan station.In practical engineering application,the structural parameters of fan station can be flexibly changed to minimize the local resistance of Fan Station and ensure the safety of working face.