The steam jet mill technology is intended to realize ultrafine grinding of fly ash through Laval noz-zle,resulting in cost-efficient preparation of ultrafine powders from various micron-level fly ashes.By analyz-ing and researching the superheated steam jet mill technology and establishing a steam jet mill grinding mod-el through CFD simulation,the effect of the grinding cavity bottom structure,number of nozzles and length of grinding cavity are quantitatively evaluated.The simulation result shows that:when the grinding cavity bot-tom structure is equipped and there are 3 or 4 nozzles,the average speed on the cross-section where the nozzles are located can reach 80m/s.In addition,when the length of grinding cavity increases from 1,080mm to 1,480mm,the average speed on the cross-section where the nozzles are located and on the outlet surface varies by less than 5m/s.Therefore,the effect caused by the length of grinding cavity is much lower than that of the number of nozzles.The simulation model provides the basis for the extensive application of fly ash ultrafine grinding technology in the industrial production line based on the superheated steam jet mill.
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