Optimization Of Fin Spacing And Material Of Mine Finned Air Cooler In Dusty State

High temperature heat damage has become a major problem that threatens the safe production of mines.The development of mine cooling system and equipment has achieved good results,but considering the high temperature,high humidity and high dust environment of the mine,ensuring long-term operation of the finned air cooler.It is very important.Aiming at the problem of low heat exchange efficiency and damage of ventilation in the current state of finned air cooler,this text takes the surface dust and dust suppression of finned air cooler as the research goal,and improves the dust accumulation of finned air cooler.The bearing capacity indirectly improves the heat exchange efficiency of the air cooler,and optimizes the fin spacing and fin material.This text analyzes the movement properties and laws of dust from a microscopic point of view,analyzes the mechanism of dust and fins from a macroscopic point of view,summarizes the thermal calculation of finned air coolers,and analyzes the fin spacing to the number of fins.The effects of thermal efficiency,dust accumulation and air volume,considering the influence of dust on the air volume and heat transfer of the air cooler,finally proposed the fin spacing optimization theory.In the range of reasonable fin spacing,the dust holding capacity at both ends is weak,the middle The dust is strong.The relationship between heat exchange efficiency and wind flow velocity and fin spacing in clean state was studied experimentally.24 sets of different data were set up,the surface fitting of the three was performed,and different mathematical models were compared.Finally,Parabola was used as the mathematical model.Using the Levinberg-Marquardt’s superposition algorithm,the obtained surface fitting equation is z(x,y)=70.1+15.5x-6.2y-1.9x2-0.02y2.The results were fitted with regression analysis to verify the accuracy of the results,and the reasonable fin spacing in the clean state was determined to be[3.2mm,4.8mm].The ANSYS Fluent simulation is used to study the bearing capacity of different fin spacings for different thicknesses of dust.The fin spacing is in the range of 3.2-4.0mm,the difference in cooling effect is small,the fins are subjected to the same thickness of dust,and the critical dust thickness is It is 0.8mm;the fin spacing is in the range of 4.0-4.8mm,the cooling effect is quite different,and its ability to withstand dust is significantly lower than the former,and the overall effect is poor.With the increase of the fin spacing,the ability to withstand the dust first becomes stronger and then weakens.Considering the wind flow and cooling effect,the reasonable value of the fin spacing is about 4mm.The principle of superhydrophobic fin surface was discussed.The experimental results of contact angle,dust accumulation and dust accumulation rate of untreated,hydrophilic,ordinary hydrophobic and superhydrophobic fin materials were observed.The dust of different fin materials was observed.After the change of the appearance,the variation rule of the dust accumulation curve was obtained,which proved that the superhydrophobic material has obvious advantages in dust suppression and self-cleaning.The engineering practice of the designed finned air cooler has achieved good results and met the cooling requirements of the working face.It proves that the research results of this paper have certain practical application value.