PRESS DEWATERING OF BROWN COAL : PART 2 -BATCH AND CONTINUOUS-SCREW OPERATIONS-
- 1 December 1989
- journal article
- research article
- Published by Taylor & Francis in Drying Technology
- Vol. 7 (4) , 697-721
- https://doi.org/10.1080/07373938908916622
Abstract
The brown coal is wet-ground and expressed in a batch constant-pressure or constant-rate operation and in a continuous screw-press operation. It is found that 90% of the moisture of the as-mined coal can be removed under the pressure of about 100 ma. Batch operations under a constant-pressure or a con-stant-rate can be analyzed well by using the Terzaghi-Voigt model and constant-pressure analysis. In a continuous screw-press operation, the resistance of the filter medium, the feed concentration and the die resistance affect the screw performance. The volumetric discharge rate under the open discharge condition can be expressed well by a lubrication theory. With discharge restricted by a screw-type die, the slip factor decreases with increase in die resistance.Keywords
This publication has 6 references indexed in Scilit:
- DELIQUORING BY EXPRESSION - PART 2 VARIABLE-PRESSURE EXPRESSIONDrying Technology, 1987
- Constant-rate expression of semisolid materials.JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 1987
- DELIQUORING BY EXPRESSION -PART 1 CONSTANT-PRESSURE EXPRESSIONDrying Technology, 1986
- Published by Elsevier ,1986
- Effects of a screw type die on expression rate of screw press.KAGAKU KOGAKU RONBUNSHU, 1985
- CALCULATIONS OF CONSOLIDATION PERIOD IN EXPRESSION OPERATIONSJOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 1974