Structural Optimization And Experimental Study Of Internal Mixing Air Atomizing Nozzle

Coal will continue to be the main energy in China for a long time in the future due to the resource characteristics of "lack of gas,lack of oil and relatively rich in coal".However,a large amount of dust will be produced in the process of coal mining.In order to reduce the dust content in the underground environment,protect the working environment of coal miners and reduce the incidence of pneumoconiosis,the mine often takes appropriate dust removal measures.Among them,spray dust removal technology is an effective wet dust removal method widely used at home and abroad,and air atomizing nozzle,as a kind of efficient atomizing nozzle,is widely used in the field of dust prevention and control in mining sites.Through theoretical analysis,experimental research and numerical simulation,this paper studies the influence of atomization performance and dust removal effect of nozzles with different structures.The main contents are as follows:Firstly,the atomization mechanism,dust removal mechanism and mathematical model of dust removal nozzle are studied.The internal flow and atomization process and characteristics of internal mixed air atomization nozzle are described.The atomization effect of atomization nozzle and the relationship between dust removal effect and gasliquid velocity,droplet diameter and droplet concentration are summarized.Then,the model of internal mixing air atomizing nozzle was established.Vt D model was used to simulate different structures of the internal mixing air atomizing nozzle under selected working conditions,in order to obtain the droplet concentration distribution,twophase flow field and droplet breakage,and the reliability of the simulation results was verified by experimental comparison and verification.Finally,a spray dust removal experiment platform was set up,and dust removal experiments were carried out on different internal mixed air atomizing nozzles under selected working conditions,and related macro parameters and dust removal efficiency were recorded.Combined with the macro parameters and dust removal performance of wide-angle air atomizing nozzles under different structures,it is concluded that under the premise of considering better dust removal effect and smaller water consumption,the number of outlets of wide-angle air atomizing nozzles should be 6-8,the outlet radius should be 0.4-0.6mm,and the spray Angle of 30°-45° is more appropriate.The research results improve the dust removal effect of air atomizing nozzle in different scenarios.In the future underground practice,it is expected to provide better dust removal spray for all kinds of spray dust removal equipment,which can more effectively protect the underground working environment and the health and safety of underground workers.Figure 37 Table 10 Reference 64...