Which factors can affect the performance parameters used in the gas current pulverizer

　　Experimental equipment is different from industrial mass production equipment, and there is a need to face a variety of materials, or experimental requirements for different particle size of the same material. When using operations, if there are different materials or different granular conditions, it is necessary to completely clean the equipment to ensure that there is no cross-contamination between materials or particle size, avoiding the experiment to not be accurate, ensuring the objectivity of experimental data. At the same time, the experimental equipment also has an operator, an operating environment, and the like have a large difference in industrial mass production equipment. This laboratory special series equipment is divided into four categories: laboratory gas flow blast (airflow mill), laboratory airflow classifier, laboratory impact grinding and laboratory inert gas protection crusher.

　　Factors affecting process performance of airflow crushers include structural parameters and process parameters. The structural parameters refer to various parameters of the machine itself, including the structure of the nozzle, the selection of the grading equipment, and the like. Process parameters refer to various parameters of process performance due to production operations, including control of feed particle size, control of feed speed, selection of high pressure working fluids, limitations of particle size, and the like. The following is a detailed introduction:

　　1. Feed particle size control

　　Mostairflow pulverizer for feed particle size Have a certain upper limit request. Taking a fluidized bed gas flow pulverizer as an example, the material can be sufficiently accelerated after entering the pulverization chamber. After large particles enter the pulverized cavity, it is difficult to completely accelerate, which will make them live too long in the machine, resulting in too high energy consumption. Therefore, in large-scale production of ultrafine powder, it is an effective way to prepare a raw material having a large particle size is an effective pathway for energy saving.

　　2. Working medium

　　Currently, the working medium of the airflow pulverizer is mainly compressed, superheated steam, inert gas, and the like. The choice of working fluid has a certain impact on crushing effects and economics. Superheated steam is better than air in terms of fluidity and critical flow rates, achieving higher flow rates and uniform flow fields. However, using superheated steam as a working fluid, it must be ensured that it is still in an overheating state before entering the product capture device, otherwise the material is condensed.

　　3. Feeding speed

　　The feed speed reflects airflow pulverizer productionAn important parameter for the ability. During the pulverization process, the optimum ratio of the intake flow rate and the feed speed is the key to improving the crushing efficiency. In general, in a certain intake flow conditions, the feed speed is proportional to the product particle size. However, the feeding speed is too fast, which will increase the particle density, mutual interference of the pulverization zone, which is not conducive to the acceleration of the particles, it is difficult to achieve a sufficiently effective collision between particles, affect the crushing effect; although the feed speed is too slow, the particles stay in the crush area The time can be extended, which will reduce the particle density, reduce the collision rate, resulting in a decrease in production capacity and an increase in unit production energy consumption.

　　4. Granular limit

　　During the pulverization process, as the material particle size is reduced, the crystallization of the material and The intensity increases. After reaching a certain degree, the particle size of the material is no longer reduced or decreased slowly, that is, the crush limit of the material is reached. At this time, the surface area of ​​the material increases, the surface activity of the particles is increased, and the particle agglomeration and grinding are in a dynamic equilibrium state, even if the grinding time is prolonged, it is difficult to further reduce the particle size of the material.

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