Because of high efficiency, energy conservation,simple operation, wide application range, and small size,the high-speed universal pulverizer has been well receivedby customers. However, its electrical motor can overhe...Because of high efficiency, energy conservation,simple operation, wide application range, and small size,the high-speed universal pulverizer has been well receivedby customers. However, its electrical motor can overheatwhen working, which hinders continuous operation of thepulverizer. In this study, a series of efforts were made toaddress this problem. Firstly, a detailed analysis of theworking principle of the pulverizer was conducted and anoptimization plan was proposed, consisting in punchingventilation holes on the surface of the original pulverizer.Simulations of the pulverizer flow field before and afteroptimization were performed. The hydrodynamic simula-tion results were used to conduct a steady state thermalanalysis of the pulverizer, investigating the influence of theflow field on heat transfer. Additionally, experimentalinvestigations were conducted on the pulverizer before andafter optimization in order to measure and compare theparameters （motor working temperature, wind speed andtemperature of the motor cooling system, vibration, noise,and pulverizing degree of the material） influencing theperformance of the pulverizer. The numerical simulationresults showed an increment in heat transfer caused byincrement in air flow volume and velocity when air wasinjected into the pulverizer through bottom and side holes.Experimental results showed that the pulverizer with airinjection through holes had the best performance whentemperature, vibration, and refinement effect were consid-ered as performance indicators.展开更多
文摘Because of high efficiency, energy conservation,simple operation, wide application range, and small size,the high-speed universal pulverizer has been well receivedby customers. However, its electrical motor can overheatwhen working, which hinders continuous operation of thepulverizer. In this study, a series of efforts were made toaddress this problem. Firstly, a detailed analysis of theworking principle of the pulverizer was conducted and anoptimization plan was proposed, consisting in punchingventilation holes on the surface of the original pulverizer.Simulations of the pulverizer flow field before and afteroptimization were performed. The hydrodynamic simula-tion results were used to conduct a steady state thermalanalysis of the pulverizer, investigating the influence of theflow field on heat transfer. Additionally, experimentalinvestigations were conducted on the pulverizer before andafter optimization in order to measure and compare theparameters （motor working temperature, wind speed andtemperature of the motor cooling system, vibration, noise,and pulverizing degree of the material） influencing theperformance of the pulverizer. The numerical simulationresults showed an increment in heat transfer caused byincrement in air flow volume and velocity when air wasinjected into the pulverizer through bottom and side holes.Experimental results showed that the pulverizer with airinjection through holes had the best performance whentemperature, vibration, and refinement effect were consid-ered as performance indicators.
