| Title |
Breakage and Mass Transport of Coal Particles in Ring-roller Mills |
| Creator |
Shoji, K.; Meguri, N.; Sato, K.; Kanemoto, H.; Shima, T.; Hasegawa, T. |
| Publisher |
University of Utah |
| Date |
1991 |
| Spatial Coverage |
presented at Honolulu, Hawaii |
| Abstract |
A mathematical model was developed for a ring-roller mill based on specific rates of breadage, primary breakage distributions and primary and secondary classification parameters. The model parameters were evaluated by laboratory and pilot-scale tests. At first, the specific rates of breakage and breakage distribution parameters of various types of coals were measured in a batch roller mill. Secondly, the primary classification of particles falling back onto the grinding table due to gravity and the secondary classification due to the built-on classifier were studied in model classifiers and empirical operating-design equations were then developed. Lastly, steady-state continuous grinding tests were carried out in pilot-scale mills to correlate variations of scale factors with make-up feed rates, mill geometry and operating conditions. Furthermore, empirical correlations on mass transport through the mills were also developed. The validity of the model was verified by steady-state data obtained in pilot- and industrial-scale mills. The effect of various operating conditions on the mill performance was first investigated by model simulations. The unsteady-state behaviors of a mill were then predicted by the model. |
| Type |
Text |
| Format |
application/pdf |
| Language |
eng |
| Rights |
This material may be protected by copyright. Permission required for use in any form. For further information please contact the American Flame Research Committee. |
| Conversion Specifications |
Original scanned with Canon EOS-1Ds Mark II, 16.7 megapixel digital camera and saved as 400 ppi uncompressed TIFF, 16 bit depth. |
| Scanning Technician |
Cliodhna Davis |
| ARK |
ark:/87278/s6057jgs |
| Setname |
uu_afrc |
| ID |
6827 |
| Reference URL |
https://collections.lib.utah.edu/ark:/87278/s6057jgs |
