| The briquetting technology for fine coal is an important branch in the Clean Coal Technology,which is a technical study of improving the production efficiency and quality of the molded coal and reducing the cost of the forming equipment based on the reduction of the coal pollution.The high-pressure balling press is a mainstream pulverized coal forming equipment,which is characterized by large forming pressure and high forming efficiency,but the high-pressure balling press currently still has the problems in China,such as complex structure,low ball-forming quality and frequent operation failure.The research of GY8532 high-pressure balling press is carried out in this paper,which plays a certain role in promoting the development of pulverized coal briquetting technology.Based on the combination of the theory and the experiment,the mechanical state of the high-pressure balling press under the actual working condition is researched and analyzed.First,carrying out a calibration experiment on the stress and the compression state of the pulverized coal to obtain a formula between the stress of the pulverized coal and the density after compression,and performing mechanical analysis on the roller wheel based on the theory of mechanics of granular media,establishing a mathematical model of the bearing torque of the roller wheel and calculating the bearing torque of the roller wheel,then carrying out torque experiment verification and choosing the roller wheel motor.The verified results show that the relative error between the theoretical calculation value of the bearing torque of the roller and the experimental value is 0.45-3.69%,and the correctness of the theoretical calculation is verified.The roller motor can meet the working requirements by selecting 15 KW through the theoretical calculation,and at the same time of reducing the producing cost of the high-pressure balling press,the runing cost is saved for the high-pressure balling press.This paper introduces the discharging form and discharging process of the pulverors material,and designs a discharging device of high-pressure balling press based on the blanking condition of the coal fine in the roller pressing area by the knowledge of mechanics of granular media.Calibrating the contact parameters of pulverized coal by the experiment of stacking angle,which have recovery coefficient,static friction coefficient and rolling friction coefficient between pulverized coal particles,then the coal blanking process is simulated in EDEM.The results show that the pulverized coal can be steadily discharge at the end of the device,and there is no arched phenomenon,which verifies the rationality of the design of the discharging device.At the same time,the velocity of pulverized coal at the end of device is obtained and compared with the theoretical calculation value of the velocity,which more systematically verifies the rationality of the design of the discharging mechanism.According to the frame structure parameters of GY8532 high-pressure balling press,the frame solid model is established by using three-dimensional modeling software,and the model is simplified and assembled,then the assembled model is imported into ABQUS software.Based on the stress of coal fine in pressing area,analyzing mechanical condition of roller wheel and carring out finite element analysis of the frame of the high-pressure balling press,the stress distribution cloud diagram and displacement distribution cloud chart of the frame are obtained,and the rationality of selecting the material for the frame is determined.Finally,the modal analysis of the frame of the high-pressure balling press is carried out,and the first 16 modes and the natural frequencies of each order are obtained.The rationality of the frame structure design of the high-pressure balling press is verified. |
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