Effect Of Particle Size Of Gas-Water Two-Phase Flow On Dust Reduction Efficiency

With the acceleration of the modernization process,energy consumption has also increased substantially.Based on China's basic national conditions of less oil and less coal,China's development path of relying on coal resources for a long time will not be shaken.However,for the occupational health and health problems of mine workers,due to the irregularity of the criteria for pneumoconiosis and the characteristics of the pneumoconiosis,people are always neglecting the harm of pneumoconiosis.However,for China,the most serious occupational disease is pneumoconiosis,especially for coal-based enterprises.In mine work,the number of coal mine workers caused by pneumoconiosis is far more than the number of casualties caused by other accidents.Taking this as a starting point,this paper uses the combination of theoretical analysis,experimental test,experimental simulation and engineering application to systematically study the dust migration law,spray dust reduction mechanism,etc.,and to represent the gas mist two-phase flow micro water mist atomization with specific numerical values.The dust reduction system is superior to the previous high pressure spray dust reduction system.The self-settlement experiment of respiratory dust was carried out in the simulated roadway in the laboratory.As a whole,the concentration of the respiratory dust decreased continuously along with the simulated roadway,which was mainly due to the self-settling of the dust.The dust in the front space has more self-precipitation,and in the later stage,the dust particle size is too small,and the gravity effect is minimal.Coupled with the influence of the wind flow,the dust particles hardly settle on their own,in a suspended state,which requires us to Intervention is carried out to allow the dust in the suspended state to settle.Through the comparison of the laser particle size tester,it is concluded that the optimal particle size of the gas-water two-phase flow micro-water mist atomization is 0.31 MPa and the water pressure is 0.2 MPa.At this time,the spray particle size D50 is 6.74 ?m,compared with the current high-pressure nozzles.When the water pressure of 4 MPa is turned on,the water pressure is reduced by 94%,and the atomization particle size is reduced by 96.5%,which greatly reduces the energy consumption and reduces the atomization particle size.Through the experimental comparison of the simulated roadway in the laboratory,it is concluded that as the atomization particle size decreases,the dust reduction efficiency increases.After the first point after the water mist of 8?m atomized particle size,the atomized water mist and the respiratory dust have not fully combined with the dust reduction efficiency to reach 59.2%,and in the later stage,the dust reduction efficiency reached 93.3%.Go to the 22410 working face of Halagou Coal Mine to conduct on-the-spot investigation,understand the layout of the fully mechanized mining face,analyze the specific data of the underground working face,and combine the previous theoretical analysis to analyze the distribution of the working dust and its migration law.It is concluded that the main dust source of the fully mechanized mining face is the crusher at the transfer point,the wind direction of the shearer is 15-20 meters,the pulverized coal drop on the support of the hydraulic support transfer process and the floating dust on the working face of the return airway The influx.Therefore,aiming at the experimental research of the dust source combined laboratory,a set of efficient,reasonable and economical comprehensive treatment of respiratory dust is proposed.Figure [39] table [14] reference [95]...