Method for dewatering water-containing coal
AssigneesYukuo Katayama, K.E.M. Corporation
InventorYukuo Katayama
Life of this patent
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Abstract
A method for dewatering water-containing coal which includes heating the water-containing coal at a temperature of 100 to 350° C. under a pressure not less than a saturated steam pressure at the temperature for the heating, while applying a shearing force of 0.01 to 20 MPa to the coal, in a sealed vessel. The method is novel and allows the production of dewatered coal which is inhibited from reabsorbing water after dewatering and is also inhibited from absorbing oxygen after dewatering.
Claims17
A method for dewatering and reducing pore volume of water-containing coal, comprising heating the water-containing coal at a temperature of 100° C. to 350° C. under a pressure not less than a saturated steam pressure at the temperature for the heating, while simultaneously applying a shearing force of 0.01 MPa to 20 MPa to the water-containing coal, in a sealed vessel, to obtain a mixture of coal from which water has been removed and water which has been removed from the water-containing coal.
A method for preparing slurry, comprising:
- obtaining a mixture of coal from which water has been removed and water which has been removed from the water-containing coal, wherein obtaining the mixture comprises:
- heating water-containing coal at a temperature of 100° C. to 350° C. under a pressure not less than a saturated steam pressure at the temperature for the heating, while simultaneously applying a shearing force of 0.01 MPa to 20 MPa to the water-containing coal, in a sealed vessel;
- and
- subsequently removing the water from the mixture or adding water to the mixture, to adjust a water content in a final mixture to 30 weight % to 50 weight %, calculated on the basis of the mixture.
Dependencies are inferred from the claim text.