US1632829A - Method of drying coal and the like - Google Patents

Method of drying coal and the like Download PDF

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Publication number
US1632829A
US1632829A US80665A US8066526A US1632829A US 1632829 A US1632829 A US 1632829A US 80665 A US80665 A US 80665A US 8066526 A US8066526 A US 8066526A US 1632829 A US1632829 A US 1632829A
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coal
drying
steam
temperature
pressure
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US80665A
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Fleissner Hans
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10F—DRYING OR WORKING-UP OF PEAT
    • C10F5/00—Drying or de-watering peat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat

Definitions

  • This invention relates to an improved method of drying coal and the like.
  • this drawback is avoided in that the colloidal character of the material is abolished as far as possible before the drying operation.
  • This may be accomplished by some sort 0 coagulation of the colloids, if the coals are heated to a higher temperature and thereby care is taken, from the coal during this procedure.
  • the coal is heated up to drying temperature inv the presence of steam or by the latter whereby care is to be taken, that the partial pressure of the steam above the fuel to be dried is that the water cannot escape from the coal during the heating.
  • a suita le apparatus for carrying out the present invention is diagrammatically illusthat water does not escapepheres,
  • 1 indicates a closed drying chamber, provided with an inclined perforated bottom 2, the lower end of Which leads to a. discharge opening 8, which is adapted to be closed.
  • the top end of the drying chamber terminates in a funnel 4, which can be closed.
  • a pipe 5 for supplying saturated steam and a pipe 6 for hot air communicate with the interior of the chamber lunderneath the perforated bottom 2, and both pipes are furnished with closing members;
  • a pipe 7 for discharging the vapors and gases is connected to the top of the drying chamber.
  • saturated steam is supplied for such a length of time, until the brown coal is heated to about 100 Celsius, without losing the moisturer At this temperature the brown coal loses its colloidal character.
  • the steam and hot air are discharged through the pipe 7 and for ably separating the same underneath the perforated bottom.
  • the temperature, steam pressure and tlme of action differs according to the moisturecontent and place of origin of the coal.
  • brown-coal from. the Alexander mine in Bohemia is heated for about three quarters of an hour at a pressure of 3 atmoscorresponding to about 130 centigrade and subsequently is dried for about 2 hours by reducing the partial steam pressure.
  • the coal from the Koflacher mine in Austria contains a considerably greater quantity of water and calls for a pressure of about 15 atmospheres corresponding to about 197 centigrade and a steam treatment for about one hour, and subsequently has to be dried between 2 and 3 hours;
  • I claim 1 Method of drying coal andthe like consisting in first heating the coal for about one hour in the presence of steam of a presatmospheres correspondin to a temperature of about 130 centigra e to a temperature of about 235 centigrade thus preventing the escape of water from the coal, thereafter progressively reducing the pressure of the steam in order to start to 25 atmospheres corresponding a the drying, end continuing this reduction until the coal is dry.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Drying Of Solid Materials (AREA)

Description

i so great,
Patented June 21, 1927.
UNITED STATES 1,632,829 PATENT OFFICE.
HANS FLEISSNER, OIF LEOBEN, AUSTRIA.
METHOD OF DRYING GOAL AND THE LIKE.
No Drawing. Application filed Januaryll, 1926, Serial No. 80,665, and. in Austria August 14, 1924.
This invention relates to an improved method of drying coal and the like.
Further it has been proposed to gradually heat the materials to be dried at firstwith a vapor-laden atmosphere but at a temperature below the vaporizing temperature of the moisture, and thereafter accelerating the drying operation, which is very slow at the beginning, by condensing the moisture of the air which is again returned and reheated during the circulation.
According to the present invention this drawback is avoided in that the colloidal character of the material is abolished as far as possible before the drying operation. This may be accomplished by some sort 0 coagulation of the colloids, if the coals are heated to a higher temperature and thereby care is taken, from the coal during this procedure. In carrying out the invention, first the coal is heated up to drying temperature inv the presence of steam or by the latter whereby care is to be taken, that the partial pressure of the steam above the fuel to be dried is that the water cannot escape from the coal during the heating. In order to attain this, it is only necessary to pass saturated steam of a suitable temperature over the coal, until the same has taken on the temperature required for the drying. Only after the coal has been subjected in this manner for some time to the necessary drying temperature, the water is allowed to escape from the coal by progressively reducing the steam-pressure, and now the coal is drying quickly. For this object air-is now passed over the coal, so that a progressive reduction of the steam-pressure takes placeand the coal is dried quite uniformly without fallin to pieces.
A suita le apparatus for carrying out the present invention is diagrammatically illusthat water does not escapepheres,
sure ranging from 3 trated by way of example in the accompanying drawing.
In the drawing, 1 indicates a closed drying chamber, provided with an inclined perforated bottom 2, the lower end of Which leads to a. discharge opening 8, which is adapted to be closed. The top end of the drying chamber terminates in a funnel 4, which can be closed. A pipe 5 for supplying saturated steam and a pipe 6 for hot air communicate with the interior of the chamber lunderneath the perforated bottom 2, and both pipes are furnished with closing members; A pipe 7 for discharging the vapors and gases is connected to the top of the drying chamber.
For carrying out the method, saturated steam is supplied for such a length of time, until the brown coal is heated to about 100 Celsius, without losing the moisturer At this temperature the brown coal loses its colloidal character. The steam and hot air are discharged through the pipe 7 and for ably separating the same underneath the perforated bottom.
After the material is completely dried, the
f same is discharged through the opening The temperature, steam pressure and tlme of action differs according to the moisturecontent and place of origin of the coal. For instance brown-coal from. the Alexander mine in Bohemia is heated for about three quarters of an hour at a pressure of 3 atmoscorresponding to about 130 centigrade and subsequently is dried for about 2 hours by reducing the partial steam pressure. The coal from the Koflacher mine in Austria contains a considerably greater quantity of water and calls for a pressure of about 15 atmospheres corresponding to about 197 centigrade and a steam treatment for about one hour, and subsequently has to be dried between 2 and 3 hours;
I claim 1. Method of drying coal andthe like consisting in first heating the coal for about one hour in the presence of steam of a presatmospheres correspondin to a temperature of about 130 centigra e to a temperature of about 235 centigrade thus preventing the escape of water from the coal, thereafter progressively reducing the pressure of the steam in order to start to 25 atmospheres corresponding a the drying, end continuing this reduction until the coal is dry.
ranging from 3 atmosgheres corresponding to a temperature of a out 130 centigrade to 25 atmospheres corresponding to a temperature of about 235 cent-igrade thus preventing the escape of water from the coal, thereafter progressively reducing the pressure of the steam inorder to start the drying, and continuing this reduction until the coal is dry.
In testimony whereof I aflix my signature.
VDR. HANS FLEISSNER.v
US80665A 1924-08-14 1926-01-11 Method of drying coal and the like Expired - Lifetime US1632829A (en)

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457116A (en) * 1944-02-28 1948-12-28 Guardite Corp Vacuum drying
US2767074A (en) * 1951-06-22 1956-10-16 Bethlehem Steel Corp Method of increasing sinter rate
US2907634A (en) * 1955-10-05 1959-10-06 Basf Ag Production of colloidally soluble aluminum hydroxide
US2929151A (en) * 1956-01-16 1960-03-22 Bailey Meter Co Autoclave control system
EP0019969A1 (en) * 1979-06-01 1980-12-10 Shell Internationale Researchmaatschappij B.V. Process for upgrading low-grade fuel fines
US4249909A (en) * 1979-05-30 1981-02-10 Hydrocarbon Research, Inc. Drying and passivating wet coals and lignite
US4514910A (en) * 1983-02-22 1985-05-07 Kamyr, Inc. Dehydration of lignite or the like
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 METHOD FOR THE 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
WO2002027251A1 (en) * 2000-09-26 2002-04-04 Technological Resources Pty Ltd Upgrading solid material
US20060096167A1 (en) * 2001-10-10 2006-05-11 Dunlop Donald D Process for in-situ passivation of partially-dried coal
US20100037516A1 (en) * 2004-05-03 2010-02-18 Evergreen Energy Inc. Method for thermally upgrading carbonaceous materials
US20100263269A1 (en) * 2001-10-10 2010-10-21 River Basin Energy, Inc. Process for Drying Coal
US8956426B2 (en) 2010-04-20 2015-02-17 River Basin Energy, Inc. Method of drying biomass
US9057037B2 (en) 2010-04-20 2015-06-16 River Basin Energy, Inc. Post torrefaction biomass pelletization

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457116A (en) * 1944-02-28 1948-12-28 Guardite Corp Vacuum drying
US2767074A (en) * 1951-06-22 1956-10-16 Bethlehem Steel Corp Method of increasing sinter rate
US2907634A (en) * 1955-10-05 1959-10-06 Basf Ag Production of colloidally soluble aluminum hydroxide
US2929151A (en) * 1956-01-16 1960-03-22 Bailey Meter Co Autoclave control system
US4249909A (en) * 1979-05-30 1981-02-10 Hydrocarbon Research, Inc. Drying and passivating wet coals and lignite
EP0019969A1 (en) * 1979-06-01 1980-12-10 Shell Internationale Researchmaatschappij B.V. Process for upgrading low-grade fuel fines
US4514910A (en) * 1983-02-22 1985-05-07 Kamyr, Inc. Dehydration of lignite or the like
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 METHOD FOR THE 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
WO2002027251A1 (en) * 2000-09-26 2002-04-04 Technological Resources Pty Ltd Upgrading solid material
US6497054B2 (en) 2000-09-26 2002-12-24 Technological Resources Pty. Ltd. Upgrading solid material
AU2001293486B2 (en) * 2000-09-26 2006-11-09 Evergreen Energy Inc. Upgrading solid material
US20060096167A1 (en) * 2001-10-10 2006-05-11 Dunlop Donald D Process for in-situ passivation of partially-dried coal
US7695535B2 (en) 2001-10-10 2010-04-13 River Basin Energy, Inc. Process for in-situ passivation of partially-dried coal
US20100263269A1 (en) * 2001-10-10 2010-10-21 River Basin Energy, Inc. Process for Drying Coal
US8197561B2 (en) 2001-10-10 2012-06-12 River Basin Energy, Inc. Process for drying coal
US20100037516A1 (en) * 2004-05-03 2010-02-18 Evergreen Energy Inc. Method for thermally upgrading carbonaceous materials
EP2287279A1 (en) * 2004-05-03 2011-02-23 Evergreen Energy Inc. Method and apparatus for thermally upgrading carbonaceous materials
US8956426B2 (en) 2010-04-20 2015-02-17 River Basin Energy, Inc. Method of drying biomass
US9057037B2 (en) 2010-04-20 2015-06-16 River Basin Energy, Inc. Post torrefaction biomass pelletization
US9988588B2 (en) 2010-04-20 2018-06-05 River Basin Energy, Inc. Post torrefaction biomass pelletization

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