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Publication numberUS1679078 A
Publication typeGrant
Publication dateJul 31, 1928
Filing dateApr 25, 1927
Priority dateMay 14, 1926
Publication numberUS 1679078 A, US 1679078A, US-A-1679078, US1679078 A, US1679078A
InventorsFleissner Hans
Original AssigneeFleissner Hans
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method of drying coal and like fuels
US 1679078 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Patented July 31, 1928.

HANS FLEISSNER, OF LEOBEN, AUSTRIA.

METHOD OI DRYING COAL AND LIKE FUELS.

No Drawing. Application filed April 25, 1927, Serial No. 188,594, and in Austria May 14, 1926.

This invention relates to an improved method of drying coal and like fuels.

It frequently happens that fuels, particularly brown-coal containing of water, fall to pieces. In order to prevent the. fuel from falling to pieces during the drying operation it has been proposed to heat the fuel to the drying temperature, e. g., to about 100 degrees centigrade, in the presence of steam or by means of steam, in order to destroy its colloidal character, and subsequently reduce gradually the pressure of the steam in order to effect a slow drying without that the fuel falls to pieces.

In the assay-office good results have been obtained with this known method. However this known method did not prove a success as soon as tests had been carried out on a large scale, because by heating the fuel to 100 degrees centigrade the colloidal character of some parts of the fuel to be dried had not been positively destroyed and the subsequent drying by reducing the pressure of the steam takes up much time, as it has to be carried out slowly.

Now tests carried out on a large scale have shown. that the drying operation can be carried out more quickly in accordance with an increased temperature to which the coal is heated before the actual drying by sub- 4 jecting it to the treatment by steam. The

process .is carried out at a quick pace in case the temperature. is considerably above 100 degrees-Celsius, for instance between 120 C. and 180 C. Already a considerable part of the water is removed from the coal during the cutting -off of the steam. The subsequent drying by reducing the steam-pressure calls for a much shorter time than without the previous heating ,to a higher temperature, and the reduction of the partial steam-pressure may be accomplished by the application of cold air, in order to obtain a considerable reduction of the water contained in the coal.

In case of employing these high temperatures the walls of the arrangements employed therefor have to be of considerable strength, but 1n spite of this the process according to the present invention possesses 'reat advantages over the known processesl great economical working will resultparticularly when employing a number of boila large quantity same from falling to first heatmg the fuel in saturated steam unwhich are arranged behind one another der pressure, to a temperature which is conslderably -hi her than the drying temperaconnectedwith each other in such a ture, and su sequently drying by reducing the partial pressure of the steam in order to prevent the fuel from falling to pieces and provlde for a quick drying.

2. Method of drying coal and like fuels of a colloidal character so as to prevent the same from falling to pieces, consisting in first heating the fuel in saturated steam under pressure, to a temperature which is considerably higher than the drying temperature, and suisequentlv rapidly cooling the steam to reduce the partial pressure thereof 7 in order to prevent the fuel from falling to pieces and provide for a quickclrying.

3. A method of drying coal and like fuels of a. colloidal character as claimed in claim 2 in which the rapid cooling of the steam is effected by blasts of cold air.

4. Method of drying materials of a collo1dal character so as to prevent the same from falling .to pieces, consisting in first heating the material in a saturated vapor of the liquid to be removed under pressure, to a temperature which is considerably higher than the vaporizing of the liquid to be removed and subsequently rapidly cooling the saturated vapor to reduce the partial pressure thereof in order to prevent the fuel from falling to pieces and provide fora quick drying.

In testimony whereof I alfix my signature.

HANS FLEISSNER.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3007254 *Jan 20, 1958Nov 7, 1961Schuster Wilhelm FProcess and apparatus for drying colloidal substances such as lignite
US4472885 *Jan 28, 1982Sep 25, 1984Electric Power Development Co., Ltd.Process and apparatus for dehydrating organic solid material
US4514910 *Feb 22, 1983May 7, 1985Kamyr, Inc.Dehydration of lignite or the like
US4514912 *Nov 14, 1980May 7, 1985Voest-Alpine AktiengesellschaftProcess for drying of organic solid materials, particularly brown coals
US4667416 *Jun 19, 1984May 26, 1987Voest-Alpine AktiengesellschaftDevice for drying organic solids of high water content
US4733478 *Oct 6, 1986Mar 29, 1988Kawasaki Jukogyo Kabushiki KaishaMethod of dewatering brown coal
US5354345 *Feb 22, 1993Oct 11, 1994Minnesota Power And LightReactor arrangement for use in beneficiating carbonaceous solids; and process
US6053954 *Jun 13, 1997Apr 25, 2000Energy & Environmental Research CenterMethods to enhance the characteristics of hydrothermally prepared slurry fuels
US6497054Sep 26, 2001Dec 24, 2002Technological Resources Pty. Ltd.Upgrading solid material
US8021445Jul 9, 2008Sep 20, 2011Skye Energy Holdings, Inc.Upgrading carbonaceous materials
US8778036Aug 22, 2011Jul 15, 2014Skye Energy Holdings, Inc.Upgrading carbonaceous materials
DE3806584A1 *Feb 26, 1988Sep 8, 1988Mitsubishi Heavy Ind LtdVerfahren zur waermebehandlung von kohle
EP2318795A1 *Jul 9, 2009May 11, 2011Skye Energy Holdings, Inc.Upgrading carbonaceous materials
WO1991003530A1 *Aug 28, 1990Mar 21, 1991Minnesota Power & LightImproved beneficiation of carbonaceous materials
Classifications
U.S. Classification34/391, 34/405
International ClassificationC10F5/00, F26B3/00
Cooperative ClassificationF26B3/00, C10F5/00
European ClassificationF26B3/00, C10F5/00