Five factors affecting the molding of coal briquettes

2019-11-22 13:35:00
E.P Machinery
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Summary :The more the filling amount of coal, the greater the reaction force to the bowl, so that sufficient pressure can be generated to compress the briquettes more compactly. Therefore, the molding pressure is related to the flowability of the coal material, the diameter and width of the press roller, the space between the two press rollers, the rotation speed of the press roller, and the shape and size of the bowl.
Coal briquette press is a kind of indispensable equipment in the industrial field both in developed countries and in China. The machine’s pressing pressure is the key to coal briquette molding, while the pressing pressure depends on the amount of coal power feed into the bowl on the compression roller. The more the filling amount of coal, the greater the reaction force to the bowl, so that sufficient pressure can be generated to compress the briquettes more compactly. Therefore, the molding pressure is related to the flowability of the coal material, the diameter and width of the press roller, the space between the two press rollers, the rotation speed of the press roller, and the shape and size of the bowl.
Coal briquette press
Coal briquette press

1. Press roller speed.
Reducing the rotation speed of the press roller can increase compress time, enhance the reaction force, promote the molding, and overcome shear stress at the interface of the bowl, it will, however, greatly reduce the coal briquette output. If the rotation speed is too fast, the compression time will be shortened, and the strength of the coal briquettes will be lowered.

2. Coal briquette materials flowability.
When the coal materials’ water (or bitumen) content is too much, their flowability will become extremely high and be glued on the roller and returned back to the feeder, in which case, the coal briquettes won’t be compacted fully, and thus the briquettes quality is not good.

On the other hand, if the coal material is too dry, its flowability will become poor, and its anelasticity will become large, which may cause insufficient coal amount in the bowl. Only when the coal material is in a proper flow state, can they be fully filled into the bowls, and thus the better quality of coal briquettes can be produced.

3. Shape and size of the bowl.
Generally, the pillow shape, the oval shape, and the round cake shape are affected with a more uniform pressure and briquetting strength during molding, compared with other shapes. As far as the size of the bowl is concerned, in general, when the bowl is small, the coal material is relatively easy to fill, which is advantageous for molding.
Coal briquettes
Coal briquettes

4. Diameter and width of the press roller.
The larger the diameter of the press roller, the more materials will be feed into the bowls, thereby contributing to the molding. But if the roller’s diameter is too large, the size of the coal briquette machine will be bulky, and significantly increase the consumption of metal materials and power. Widen the press roller will increase the bowl amount and coal briquette capacity. But if the press roller is too wide, the pressure per unit area of the roller will be correspondingly reduced, and cause uneven spread of the coal material on the press roller, thereby reducing the strength of the coal briquettes.
Press roller
Press roller

5. Space between the two press rollers.
The spacing between the two press rollers is inversely proportional to the compression ratio. Reduce the space can increase the molding pressure, but if the space is too small, the coal materials won’t be easy to fill the bowl, and thus generated poor coal briquettes. Too large space between the two press rollers, however, will affect the strength of the briquettes, and cause over-thick and loose shaped coal briquettes.

E.P Machinery is a professional in coal briquette press machines. If you have any questions about these machines, please contact E.P Machinery at any time. E.P Machinery’s technicians and salesmen will answer your question.

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