US1679078A - Method of drying coal and like fuels - Google Patents

Method of drying coal and like fuels Download PDF

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Publication number
US1679078A
US1679078A US18659427A US1679078A US 1679078 A US1679078 A US 1679078A US 18659427 A US18659427 A US 18659427A US 1679078 A US1679078 A US 1679078A
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drying
steam
fuel
pressure
coal
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Fleissner Hans
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Fleissner Hans
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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10FDRYING OR WORKING-UP OF PEAT
    • C10F5/00Drying or de-watering peat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00Drying solid materials or objects by processes involving the application of heat

Description

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.

US1679078A 1926-05-14 1927-04-25 Method of drying coal and like fuels Expired - Lifetime US1679078A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3007254A (en) * 1953-08-10 1961-11-07 Wilhelm F Schuster Process and apparatus for drying colloidal substances such as lignite
US4472885A (en) * 1982-01-28 1984-09-25 Electric Power Development Co., Ltd. Process and apparatus for dehydrating organic solid material
US4514910A (en) * 1983-02-22 1985-05-07 Kamyr, Inc. Dehydration of lignite or the like
US4514912A (en) * 1980-01-21 1985-05-07 Voest-Alpine Aktiengesellschaft Process for drying of organic solid materials, particularly brown coals
US4667416A (en) * 1983-06-30 1987-05-26 Voest-Alpine Aktiengesellschaft Device for drying organic solids of high water content
US4733478A (en) * 1985-10-07 1988-03-29 Kawasaki Jukogyo Kabushiki Kaisha Method of dewatering brown coal
DE3806584A1 (en) * 1987-02-27 1988-09-08 Mitsubishi Heavy Ind Ltd Process for Heat Treatment of coal
WO1991003530A1 (en) * 1989-08-29 1991-03-21 Minnesota Power And Light Improved beneficiation of carbonaceous materials
US5354345A (en) * 1989-08-29 1994-10-11 Minnesota Power And Light Reactor arrangement for use in beneficiating carbonaceous solids; and process
US6053954A (en) * 1996-06-14 2000-04-25 Energy & Environmental Research Center Methods to enhance the characteristics of hydrothermally prepared slurry fuels
US6497054B2 (en) 2000-09-26 2002-12-24 Technological Resources Pty. Ltd. Upgrading solid material
WO2010006157A1 (en) 2008-07-09 2010-01-14 Skye Energy Holdings Llc Upgrading carbonaceous materials

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3007254A (en) * 1953-08-10 1961-11-07 Wilhelm F Schuster Process and apparatus for drying colloidal substances such as lignite
US4514912A (en) * 1980-01-21 1985-05-07 Voest-Alpine Aktiengesellschaft Process for drying of organic solid materials, particularly brown coals
US4472885A (en) * 1982-01-28 1984-09-25 Electric Power Development Co., Ltd. Process and apparatus for dehydrating organic solid material
US4514910A (en) * 1983-02-22 1985-05-07 Kamyr, Inc. Dehydration of lignite or the like
US4667416A (en) * 1983-06-30 1987-05-26 Voest-Alpine Aktiengesellschaft Device for drying organic solids of high water content
US4733478A (en) * 1985-10-07 1988-03-29 Kawasaki Jukogyo Kabushiki Kaisha Method of dewatering brown coal
DE3806584A1 (en) * 1987-02-27 1988-09-08 Mitsubishi Heavy Ind Ltd Process for Heat Treatment of coal
WO1991003530A1 (en) * 1989-08-29 1991-03-21 Minnesota Power And Light Improved beneficiation of carbonaceous materials
US5354345A (en) * 1989-08-29 1994-10-11 Minnesota Power And Light Reactor arrangement for use in beneficiating carbonaceous solids; and process
US6053954A (en) * 1996-06-14 2000-04-25 Energy & Environmental Research Center Methods to enhance the characteristics of hydrothermally prepared slurry fuels
US6497054B2 (en) 2000-09-26 2002-12-24 Technological Resources Pty. Ltd. Upgrading solid material
WO2010006157A1 (en) 2008-07-09 2010-01-14 Skye Energy Holdings Llc Upgrading carbonaceous materials
US20100005710A1 (en) * 2008-07-09 2010-01-14 Pipal Energy Resources, Llc Upgrading Carbonaceous Materials
EP2318795A1 (en) * 2008-07-09 2011-05-11 Skye Energy Holdings, Inc. Upgrading carbonaceous materials
US8021445B2 (en) 2008-07-09 2011-09-20 Skye Energy Holdings, Inc. Upgrading carbonaceous materials
US8778036B2 (en) 2008-07-09 2014-07-15 Skye Energy Holdings, Inc. Upgrading carbonaceous materials
EP2318795B1 (en) * 2008-07-09 2016-12-07 Skye Energy Holdings, Inc. Upgrading carbonaceous materials

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