Influence Of Hot Air On Grinding MillDate:2018-12-15

Summary:The impact of grinding millSummary of contents: When the grinding mill is working, the hot air is not only used to dry the material, but also the material after

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The impact of grinding mill

Summary of contents: When the grinding mill is working, the hot air is not only used to dry the material, but also the material after grinding is sent to the powder selection area for sorting. Therefore, the hot air will produce the grinding mill. Fineness and other important influences, the main influencing factors are wind speed and air volume, as follows. The grinding mill is a device that integrates grinding, conveying, drying and powder selection. When it is working, the hot air is not only dried, but also the material after grinding is sent to the powder selection area. Selection, so the hot air will have an important impact on the output and fineness of the grinding mill. The main influencing factors are wind speed and air volume, as follows.

1, wind speed

The operation of the grinding mill is generally wind-sweeping. The wind sweeping speed in the mill will play an important role in the production of the mill, mainly reflected in the wind speed of the nozzle at the wind ring and the wind speed of the cross-section of the cylinder. The wind speed at the vent of the wind ring is used to blow back the material overflowing from the grinding disc back to the grinding disc and grind it again, so that the material particles are not allowed to fall. The size of the wind speed controls the size of the falling coarse particles on the one hand, and controls the circulation amount on the other hand. And the thickness of the bed, in the wind sweep system, the wind speed can reach 60-100m / s, such a large wind speed is conducive to heat transfer, but the resistance is greatly increased. According to the statistics, the pressure loss at the wind ring accounts for 57% of the total pressure loss of the whole system. To reduce the pressure loss at the place, one way is to greatly reduce the wind speed, and partially discharge the material with the hoist for external circulation. To reduce the pressure loss, another method is to properly adjust the wind speed between the sections in the circumferential direction of the wind ring. In the actual operation, the flow around the circumference is uneven, and the flow in the second half of the grinding roller is small, and in the front half of the grinding roller. And the flow between the two rolls is more, the area with less flow, the wind speed of the wind ring can be lower, the area with more flow, the wind speed of the wind ring is higher, which can be changed by inserting the wind ring into the wind ring area of ??each area. By adjusting, not only can the circulating material in the grinding mill be uniform, thereby improving the grinding ability, and at the same time, the average wind speed of the wind ring can be appropriately reduced, so that the resistance here can be reduced by about 20%.

The purpose of the cross-section wind speed is to lift the material to the classifier for sorting. Since there is a certain proportional relationship between the cross-section of the cylinder and the diameter of the disc, the wind speed inside the mill cannot be increased indefinitely. If it is too large, it not only increases the ventilation resistance. , the jet wears, and will cause a lot of material to be upgraded, the recycling cycle is too large, and the product fineness becomes thicker and other operational problems.

2, the amount of air

In the process of grinding mill, a large amount of hot air is required to meet the needs of drying. If the air volume is too large or too small, it will have an important impact on the output of the powder separator and the fineness of the product. Therefore, the air volume for drying should be It is proportional to the output of grinding mills. In the case of a certain wind speed, if the air volume in the mill increases, the output of the classifier will increase, the fineness of the product will become coarser, and the amount of return in the mill will increase, and the stability of the layer will decrease. If the air volume in the mill is reduced, the hot air drying ability is insufficient, resulting in a large moisture of the material, resulting in a serious over-grinding phenomenon, and the dust brought into the powder chamber by the hot air is reduced, thereby reducing the output of the classifier. Therefore, when the grinding mill is working normally, ventilation should be adjusted as little as possible to stabilize the material layer and reduce vibration.

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