Method for evaporating and dehydrating solid material
OwnerBin Xu, Lalin Chu +1inventors
InventorsBin Xu, Lalin Chu, Hongsong Ma
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Abstract
Disclosed is a method for evaporating and dehydrating a solid material; the method comprises: providing a plurality of digesters, with the digesters being in a parallel connection with respect to the flow direction of the solid material, wherein each digester repeatedly performs the arranged steps of step-by-step heating and evaporating and dehydrating the solid material from low temperatures to high temperatures in a time sequence. The solid material is brown coal. The quality of the brown coal is improved by the method.
Claims15
A method for dehydration of a solid material via multiple-effect evaporation, comprising:
- providing a plurality of digesters, with the digesters being in a parallel connection with respect to a flow direction of the solid material, wherein each digester performs repeatedly the following steps arranged in a time sequence:
- i. charging in a solid material and hot water to perform a first heating of the solid material using the hot water;
- ii. feeding a first steam to perform a second heating of the solid material, and discharging the condensed water generated in this step;
- iii. feeding a second steam to perform a third heating of the solid material, and discharging the condensed water generated in this step;
- iv. feeding a saturated steam to perform a fourth heating of the solid material to make it reach a predetermined temperature thereof, and discharging the condensed water generated in this step;
- v. feeding a superheated steam to digest the solid material reaching the predetermined temperature to evaporate moisture contained in the solid material, while the superheated steam becomes a saturated steam, and the saturated steam is discharged during the digesting process;
- vi. performing a first pressure reduction of the digester, and discharging a third steam;
- vii. performing a second pressure reduction of the digester, and discharging a fourth steam;
- and
- viii. allowing the digester to restore normal pressure, and discharging the solid material.
Dependencies are inferred from the claim text.