CA1218849A - Method of producing coal and coal mixtures which are safe to transport and to store - Google Patents
Method of producing coal and coal mixtures which are safe to transport and to storeInfo
- Publication number
- CA1218849A CA1218849A CA000417146A CA417146A CA1218849A CA 1218849 A CA1218849 A CA 1218849A CA 000417146 A CA000417146 A CA 000417146A CA 417146 A CA417146 A CA 417146A CA 1218849 A CA1218849 A CA 1218849A
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- Canada
- Prior art keywords
- coal
- temperature
- mixture
- ignition temperature
- granular size
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method of producing coal or coal mixtures of a fine granular size, especially coal dust, which is safe to store and particularly to transport by road, rail, and sea. The coal comprises up to 10 % volatile constituents, or the coal mixtures comprise one or more components which make up up to 50 % of the weight of the mixture and com-prise up to 15 % volatile constituents, and a residual component or components having up to 10 % volatile con-stituents. The coal or coal mixtures are subjected to a thermal treatment for from 30 seconds to 1 hour at a temperature of between lOO°C and below the ignition temperature of the coal or the coal mixture, or are heated for from 5 to 30 seconds at a temperature above the ignition temperature of the coal or of the mixture to a temperature which is below the ignition temperature.
A method of producing coal or coal mixtures of a fine granular size, especially coal dust, which is safe to store and particularly to transport by road, rail, and sea. The coal comprises up to 10 % volatile constituents, or the coal mixtures comprise one or more components which make up up to 50 % of the weight of the mixture and com-prise up to 15 % volatile constituents, and a residual component or components having up to 10 % volatile con-stituents. The coal or coal mixtures are subjected to a thermal treatment for from 30 seconds to 1 hour at a temperature of between lOO°C and below the ignition temperature of the coal or the coal mixture, or are heated for from 5 to 30 seconds at a temperature above the ignition temperature of the coal or of the mixture to a temperature which is below the ignition temperature.
Description
~8~9 The prevent invention rules to method of producing coal or coal mixtures of a fine granular size prefQrEIbly coal Utah he cowl or coal mixer are safe to store and in particular are safe to ~:r~nYport by rouge rail, end sea For purpose of this application, coal Eddy coal mix-lures of a foe granular size refer to a granular size of up to 3 mm; coal do or pulverized coal ho a growler size ox up to 071 mull (100 p)- Road and rail try port rears to transport from one region to Ankara, which lodger 10 periods of tîm~9 in contrast Jo tr~n~por~ within a plot.
The transport of fill gained coal end coal dust way up to now carried out in suitable containers accompanied by the use of on inert gas, for example nitrogen or another gay kenning lets than 8 - 10 % oxygen. It has Also been trued lo swore and transport with safety coal end coal mixture wealth a protective go In this connection, see the dehydration methods of US, Patent 3,723,079 end 4~192,650, ~ccord~n~ to which coal, which has been dried Jo a rudely moisture of 0 Jo it subjected to a steam ~re~mQst at 100 to 115C Gil the moisture content of toe Goal ha gain roached 2 - 10 % (US. Patent 49192,650), or thy dry coal it treated at 175 - 225~C with a quantity of oxygen equaling OHS 8 % of the White of the oily and the thus pretreated coy rehydraPed with a quint of water equalli~g 1.5 - 6 Z of toe weighs of the coal The "H3ndbuch dyes KokRreiw~ens" (~dbo~k of Coka;~ven-Plant Oppression Vol. I, 1955, Page 62, 63, de~cribe3 ~Z18849 laboratory tests for a so-called preliminary oxidation. This handbook states that easily oxidizable gas coal (in which the volatile constituents are greater than 15% water- and ash-free) are preliminarily oxidized at 250C in approximately lo to 20 hours. In "Gluc~auf", 1950, Pages 988, 989, the treatment of fat coal (in which the volatile constituents are 12 - 14~ water- and ash-free) and of anthracite are described in order to make it possible to store them. In this case, a thermal treatment is effected for 24 hours at a temperature of 125 - 275C.
It is an object of the present invention to provide a method for producing the aforementioned coal and coal mixtures, the storage and transport of which complies with safety regulations, yet does not require any costly expenditures during storage and transport. In other words, the coal or coal mixtures produced according to the method of the present invention should be capable of being stored in a conventional manner and of being transported by road, rail, or sea, without requiring additional expensive precautionary measures.
This object, and other objects and advantages of the present invention, will appear more clearly from the following specification.
By one aspect of the present invention there is provided a method of producing coal of a fine granular size of up to I mm which is safe for transporting and storage, said method comprising the steps of: drying said coal in a thermal treatment zone for attaining a maximum moisture content up to I by weight by subjecting said coal to said thermal treatment; carrying out said thermal treatment in an ~18~49 atmosphere in a range of 12~ to 21~ oxygen employed to treat said coal having up to 10~ volatile constituents; said coal being further subjected to a thermal aging step which comprises heating said coal for a time in a range of from 30 sec. to 1 hr. at a temperature in a range of between 100 C
and a temperature which is below the ignition temperature of said coal and including steps of heating said coal for from 5 to 30 sec., at a temperature which is above ignition temperature of said coal, and thereafter to a temperature slightly below said ignition temperature of said coal; and providing coal in which the proportion thereof having a granular size of less than a predetermined amount is greater than the proportion thereof having a granular size of greater than said predetermined amount.
By another aspect of this invention there is provided a method of producing a coal mixture of a fine granular size, said method comprising the steps of: drying the coal mixture for attaining a maximum moisture content up to I by weight at temperatures above ignition temperature thereof, said temperatures being applied briefly to at least one ingredient thereof which constitutes up to 50% of the weight of said mixture and having up to 15% volatile constituents; and at least one residual constituent having up to 10~ volatile constituents; subjecting said coal mixture to further alternative thermal treatment for a time ranging from 30 sec.
to l hr. at a temperature of between 100C and slightly below the ignition temperature of said coal mixture; and selectively heating said coal mixture for from 5 to 20 sec., at a temperature above the ignition temperature of said coal 0 mixture, to a temperature below said ignition temperature;
- pa -;' 'I
Zoo and carrying out both said thermal treatments in an atmosphere containing at least 12~ 2-Pursuant to another aspect of this invention there is provided in a method of producing safe-to-store and safe-to-transport coal or coal mixtures with a granular size up to 3 mm, which, being redried in an 02-containing atmosphere are subjected to a heat treatment, without any ignition occurring, the improvement comprising therewith, that a coal or coal mixture with ingredients including one having volatile constituents up to 10~, which is formed up to 50% by weight of one or more mixture ingredients with up to 15%
volatile constituents and a residue ingredient with up to 10 volatile constituents, being subjected to treatment in an atmosphere with 12 to 20.95% 2 -portion for a duration of 30 sec. to 1 hr. at a temperature between 100~ C and below ignition temperature thereof or for a duration of 5 to 30 seconds above ignition temperature thereof, whereby the water content before or during the heat treatment is adjusted to a maximum of 3%.
Pursuant to yet another aspect of this invention there is provided a method of producing coal of a fine granular size of up to 3.0 mm which is safe for transporting and storage, said method having improvement therewith in combination comprising the steps of: providing coal in which the proportion thereof having a granular size of less than 45 mu is greater than the proportion thereof having a granular size of greater than 45 I; drying said coal in a main thermal treatment zone for attaining a maximum moisture content up to I by weight; subjecting said coal to said thermal treatment at a temperature in a range of from 20~ below to 20% above ~21~84~
said ignition temperature thereof; carrying out said main thermal treatment in an atmosphere containing at least 12% 2 in an atmosphere in a range of 12~ to 21~ oxygen applied relative to said coal having up to 10~ volatile constituents;
carrying out said main heat treatment for more than one minute utilizing a fluidized bed chamber, a drum, a stream tube drier, or a belt drier; and subjecting said coal for aging thereof additionally to further thermal treatment consisting of heating said coal for a time in a range of from 30 sec. to 1 hr. at a temperature in a range of between 100 C and a temperature which is slightly below the ignition temperature of said coal and including steps of heating said coal for from 5 to 30 sec., at a temperature which is above ignition temperature of said coal, and thereafter to a temperature slightly below said ignition temperature of said coal.
According to further features of the present invention, which serve to improve and further develop the aforementioned features, the coal or coal mixture may be sub-- pa -jetted to a thermal treatment at a temperature of from 20 %
below to 20 % above the ignition temperature. The coal or coal mixture may be redried, and may then be subjected to a thermal treatment for thirty seconds to one hour at temperatures between 100C sod slightly below the ignition temperature of the dust.
The thermal trimmed may be effected in a normal at-misfire, or in an atmosphere of higher than 12 % oxygen.
The redrying of the coal or coal mixture which is freshly mined or is mQi~t from preparation, can be effected in a known manner a temperatures above the ignition temperature.
The proportion of the coal or coal mixture which is less than 45 may be greater than the proportion which is greater than 45 pro The coal or coal mixture may have a granular size which is less than or equal to 45 p.
The coal may be thermally treated in a fluidized bed chamber, drum, a stream tube drier or on a belt drier for more than one minute Fine coal may be redried to a water content of 2-3 %, whereupon it may be sorted and the resulting coal may be thermally treated for thirty seconds to one hour The coal or coal mixture may be limited in its therm treatment, in that it is not heated to a temperature of higher than 30% above its ignition temperature The cowl may be redried to a water content of 2-3 %, and then subjected to a thermal treatment for more than ~.rJ 1~38~9 10 seconds at temperature above the ignition temperature of the coal.
The refrain to coal or coal mixtures refer to water-free and ash-free coal and coal mixtures.
The thermal treatment of coal is known for various other purposes and for other than being able to safely store or transport it. The precise thermal if atment of certain coals and coal mixtures pursuant to the present invention deports not only from the rehydratio~ and long term pro-luminary oxidation, but is also in contrast to a thermaltreatment~or drying coal which has bee freshly mined and us most from preparation, with which latter thermal treat-mint the coal it subjected to a shock heating for 1 - 2 second at a temperature which is on~iderably greater the the ignition point of She coal. An ignition of the coal does not tyke place due to the short tome of treat-mint, especially, however, due to the heat-flux density.
Coal preliminarily dried in this manner does jot meet the requirements for safety during storage and transport of the coal or coal mixtures.
Since for the use of cowl or a coal mixture, especial-lye cowl dust, generally a water content of at most 2 - 3 %
by weigh is required, the treatment of freshly mined and moistly prepared cowl or a coal mixture can be effected in such a way what during the aforementioned thermal treat-mint the water content is reduced to 2 - 3 %. In another L;~18849 procedure, the preliminary drying can be effected first and the thermal treatment can then be effected, so that the water content is reduced to 2 - 3 % or less. The criteria of the water content us not crucial for the therms treatment itself, i.e. the thermal treatment is not directed primarily at achieving a certain water con-tent, but rather the main thing to the aging of the coal by the thermal treatment over a certain period of time.
Nevertheless, the length of time and the temperature of the thermal treatment can be adjusted in such a way that the coal which is treated at the same time Allah contains the desired water context. The primrose "length of treatment" and 'temperature" can therefore be selected while observing the data end limit and con be altered as a function of one another.
The transport of fill gained coal end coal dust way up to now carried out in suitable containers accompanied by the use of on inert gas, for example nitrogen or another gay kenning lets than 8 - 10 % oxygen. It has Also been trued lo swore and transport with safety coal end coal mixture wealth a protective go In this connection, see the dehydration methods of US, Patent 3,723,079 end 4~192,650, ~ccord~n~ to which coal, which has been dried Jo a rudely moisture of 0 Jo it subjected to a steam ~re~mQst at 100 to 115C Gil the moisture content of toe Goal ha gain roached 2 - 10 % (US. Patent 49192,650), or thy dry coal it treated at 175 - 225~C with a quantity of oxygen equaling OHS 8 % of the White of the oily and the thus pretreated coy rehydraPed with a quint of water equalli~g 1.5 - 6 Z of toe weighs of the coal The "H3ndbuch dyes KokRreiw~ens" (~dbo~k of Coka;~ven-Plant Oppression Vol. I, 1955, Page 62, 63, de~cribe3 ~Z18849 laboratory tests for a so-called preliminary oxidation. This handbook states that easily oxidizable gas coal (in which the volatile constituents are greater than 15% water- and ash-free) are preliminarily oxidized at 250C in approximately lo to 20 hours. In "Gluc~auf", 1950, Pages 988, 989, the treatment of fat coal (in which the volatile constituents are 12 - 14~ water- and ash-free) and of anthracite are described in order to make it possible to store them. In this case, a thermal treatment is effected for 24 hours at a temperature of 125 - 275C.
It is an object of the present invention to provide a method for producing the aforementioned coal and coal mixtures, the storage and transport of which complies with safety regulations, yet does not require any costly expenditures during storage and transport. In other words, the coal or coal mixtures produced according to the method of the present invention should be capable of being stored in a conventional manner and of being transported by road, rail, or sea, without requiring additional expensive precautionary measures.
This object, and other objects and advantages of the present invention, will appear more clearly from the following specification.
By one aspect of the present invention there is provided a method of producing coal of a fine granular size of up to I mm which is safe for transporting and storage, said method comprising the steps of: drying said coal in a thermal treatment zone for attaining a maximum moisture content up to I by weight by subjecting said coal to said thermal treatment; carrying out said thermal treatment in an ~18~49 atmosphere in a range of 12~ to 21~ oxygen employed to treat said coal having up to 10~ volatile constituents; said coal being further subjected to a thermal aging step which comprises heating said coal for a time in a range of from 30 sec. to 1 hr. at a temperature in a range of between 100 C
and a temperature which is below the ignition temperature of said coal and including steps of heating said coal for from 5 to 30 sec., at a temperature which is above ignition temperature of said coal, and thereafter to a temperature slightly below said ignition temperature of said coal; and providing coal in which the proportion thereof having a granular size of less than a predetermined amount is greater than the proportion thereof having a granular size of greater than said predetermined amount.
By another aspect of this invention there is provided a method of producing a coal mixture of a fine granular size, said method comprising the steps of: drying the coal mixture for attaining a maximum moisture content up to I by weight at temperatures above ignition temperature thereof, said temperatures being applied briefly to at least one ingredient thereof which constitutes up to 50% of the weight of said mixture and having up to 15% volatile constituents; and at least one residual constituent having up to 10~ volatile constituents; subjecting said coal mixture to further alternative thermal treatment for a time ranging from 30 sec.
to l hr. at a temperature of between 100C and slightly below the ignition temperature of said coal mixture; and selectively heating said coal mixture for from 5 to 20 sec., at a temperature above the ignition temperature of said coal 0 mixture, to a temperature below said ignition temperature;
- pa -;' 'I
Zoo and carrying out both said thermal treatments in an atmosphere containing at least 12~ 2-Pursuant to another aspect of this invention there is provided in a method of producing safe-to-store and safe-to-transport coal or coal mixtures with a granular size up to 3 mm, which, being redried in an 02-containing atmosphere are subjected to a heat treatment, without any ignition occurring, the improvement comprising therewith, that a coal or coal mixture with ingredients including one having volatile constituents up to 10~, which is formed up to 50% by weight of one or more mixture ingredients with up to 15%
volatile constituents and a residue ingredient with up to 10 volatile constituents, being subjected to treatment in an atmosphere with 12 to 20.95% 2 -portion for a duration of 30 sec. to 1 hr. at a temperature between 100~ C and below ignition temperature thereof or for a duration of 5 to 30 seconds above ignition temperature thereof, whereby the water content before or during the heat treatment is adjusted to a maximum of 3%.
Pursuant to yet another aspect of this invention there is provided a method of producing coal of a fine granular size of up to 3.0 mm which is safe for transporting and storage, said method having improvement therewith in combination comprising the steps of: providing coal in which the proportion thereof having a granular size of less than 45 mu is greater than the proportion thereof having a granular size of greater than 45 I; drying said coal in a main thermal treatment zone for attaining a maximum moisture content up to I by weight; subjecting said coal to said thermal treatment at a temperature in a range of from 20~ below to 20% above ~21~84~
said ignition temperature thereof; carrying out said main thermal treatment in an atmosphere containing at least 12% 2 in an atmosphere in a range of 12~ to 21~ oxygen applied relative to said coal having up to 10~ volatile constituents;
carrying out said main heat treatment for more than one minute utilizing a fluidized bed chamber, a drum, a stream tube drier, or a belt drier; and subjecting said coal for aging thereof additionally to further thermal treatment consisting of heating said coal for a time in a range of from 30 sec. to 1 hr. at a temperature in a range of between 100 C and a temperature which is slightly below the ignition temperature of said coal and including steps of heating said coal for from 5 to 30 sec., at a temperature which is above ignition temperature of said coal, and thereafter to a temperature slightly below said ignition temperature of said coal.
According to further features of the present invention, which serve to improve and further develop the aforementioned features, the coal or coal mixture may be sub-- pa -jetted to a thermal treatment at a temperature of from 20 %
below to 20 % above the ignition temperature. The coal or coal mixture may be redried, and may then be subjected to a thermal treatment for thirty seconds to one hour at temperatures between 100C sod slightly below the ignition temperature of the dust.
The thermal trimmed may be effected in a normal at-misfire, or in an atmosphere of higher than 12 % oxygen.
The redrying of the coal or coal mixture which is freshly mined or is mQi~t from preparation, can be effected in a known manner a temperatures above the ignition temperature.
The proportion of the coal or coal mixture which is less than 45 may be greater than the proportion which is greater than 45 pro The coal or coal mixture may have a granular size which is less than or equal to 45 p.
The coal may be thermally treated in a fluidized bed chamber, drum, a stream tube drier or on a belt drier for more than one minute Fine coal may be redried to a water content of 2-3 %, whereupon it may be sorted and the resulting coal may be thermally treated for thirty seconds to one hour The coal or coal mixture may be limited in its therm treatment, in that it is not heated to a temperature of higher than 30% above its ignition temperature The cowl may be redried to a water content of 2-3 %, and then subjected to a thermal treatment for more than ~.rJ 1~38~9 10 seconds at temperature above the ignition temperature of the coal.
The refrain to coal or coal mixtures refer to water-free and ash-free coal and coal mixtures.
The thermal treatment of coal is known for various other purposes and for other than being able to safely store or transport it. The precise thermal if atment of certain coals and coal mixtures pursuant to the present invention deports not only from the rehydratio~ and long term pro-luminary oxidation, but is also in contrast to a thermaltreatment~or drying coal which has bee freshly mined and us most from preparation, with which latter thermal treat-mint the coal it subjected to a shock heating for 1 - 2 second at a temperature which is on~iderably greater the the ignition point of She coal. An ignition of the coal does not tyke place due to the short tome of treat-mint, especially, however, due to the heat-flux density.
Coal preliminarily dried in this manner does jot meet the requirements for safety during storage and transport of the coal or coal mixtures.
Since for the use of cowl or a coal mixture, especial-lye cowl dust, generally a water content of at most 2 - 3 %
by weigh is required, the treatment of freshly mined and moistly prepared cowl or a coal mixture can be effected in such a way what during the aforementioned thermal treat-mint the water content is reduced to 2 - 3 %. In another L;~18849 procedure, the preliminary drying can be effected first and the thermal treatment can then be effected, so that the water content is reduced to 2 - 3 % or less. The criteria of the water content us not crucial for the therms treatment itself, i.e. the thermal treatment is not directed primarily at achieving a certain water con-tent, but rather the main thing to the aging of the coal by the thermal treatment over a certain period of time.
Nevertheless, the length of time and the temperature of the thermal treatment can be adjusted in such a way that the coal which is treated at the same time Allah contains the desired water context. The primrose "length of treatment" and 'temperature" can therefore be selected while observing the data end limit and con be altered as a function of one another.
Claims (15)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of producing coal of a fine granular size of up to 3.0 mm which is safe for trans-porting and storage, said method comprising the steps of:
drying said coal in a thermal treatment zone for attaining a maximum moisture content up to 3% by weight by subjecting said coal to said thermal treatment;
carrying out said thermal treatment in an atmosphere in a range of 12% to 21% oxygen employed to treat said coal having up to 10% volatile constituents;
said coal being further subjected to a thermal aging step which comprises heating said coal for a time in a range of from 30 sec. to 1 hr. at a temperature in a range of between 100° C and a temper-ature which is below the ignition temperature of said coal and including steps of heating said coal for from 5 to 30 sec., at a temperature which is above ignition temperature of said coal, and thereafter to a tempera-ture slightly below said ignition temperature of said coal and providing coal in which the proportion thereof having a granular size of less than a pre-determined amount is greater than the proportion thereof having a granular size of greater than said predetermined amount.
drying said coal in a thermal treatment zone for attaining a maximum moisture content up to 3% by weight by subjecting said coal to said thermal treatment;
carrying out said thermal treatment in an atmosphere in a range of 12% to 21% oxygen employed to treat said coal having up to 10% volatile constituents;
said coal being further subjected to a thermal aging step which comprises heating said coal for a time in a range of from 30 sec. to 1 hr. at a temperature in a range of between 100° C and a temper-ature which is below the ignition temperature of said coal and including steps of heating said coal for from 5 to 30 sec., at a temperature which is above ignition temperature of said coal, and thereafter to a tempera-ture slightly below said ignition temperature of said coal and providing coal in which the proportion thereof having a granular size of less than a pre-determined amount is greater than the proportion thereof having a granular size of greater than said predetermined amount.
2. A method according to claim 1, which in-cludes the step of subjecting said coal to said thermal treatment at a temperature of from 20% below to 20% above said ignition temperature.
3. A method according to claim 2, which in-cludes the step of providing coal in which the pro-portion thereof having a granular size of less than 45 µ is greater than the proportion thereof having a granular size of greater than 45 µ.
4. A method according to claim 3, which in-cludes the step of providing coal having a granular size of at most 45 µ.
5. A method according to claim 2, which in-cludes the step of carrying out said heat treatment for more than one minute utilizing a fluidized bed chamber, a drum, a stream tube drier, or a belt drier.
6. A method of producing a coal mixture of a fine granular size, said method comprising the steps of:
drying the coal mixture for attaining a maximum moisture content up to 3% by weight at temper-atures above ignition temperature thereof, said temper-atures being applied briefly to at least one ingredient thereof which constitutes up to 50% of the weight of said mixture and having up to 15% volatile constit-uents; and at least one residual constituent having up to 10% volatile constituents;
subjecting said coal mixture to further alternative thermal treatment for a time ranging from 30 sec. to 1 hr. at a temperature of between 100°C
and slightly below the ignition temperature of said coal mixture; and selectively heating said coal mix-ture for from 5 to 20 sec., at a temperature above the ignition temperature of said coal mixture, to a temperature below said ignition temperature; and carrying out both said thermal treat-ments in an atmosphere containing at least 12% O2.
drying the coal mixture for attaining a maximum moisture content up to 3% by weight at temper-atures above ignition temperature thereof, said temper-atures being applied briefly to at least one ingredient thereof which constitutes up to 50% of the weight of said mixture and having up to 15% volatile constit-uents; and at least one residual constituent having up to 10% volatile constituents;
subjecting said coal mixture to further alternative thermal treatment for a time ranging from 30 sec. to 1 hr. at a temperature of between 100°C
and slightly below the ignition temperature of said coal mixture; and selectively heating said coal mix-ture for from 5 to 20 sec., at a temperature above the ignition temperature of said coal mixture, to a temperature below said ignition temperature; and carrying out both said thermal treat-ments in an atmosphere containing at least 12% O2.
7. A method according to claim 6, which in-cludes the step of subjecting said coal mixture to said thermal treatment at a temperature of from 20%
below to 20% above said ignition temperature.
below to 20% above said ignition temperature.
8. A method according to claim 7, which in-cludes the step of providing coal mixtures in which the proporation thereof having a granular size of less than 45 µ is greater than the proporation thereof having a granular size of greater than 45 u.
9. A method according to claim 8, which in-cludes the step of providing a coal mixture having a granular size of at most 45 µ.
10. In a method of producing safe-to-store and safe-to-transport coal or coal mixtures with a granular size up to 3 mm, which being pre-dried in an O2-containing atmosphere are subjected to a heat treat-ment, without any ignition occurring, comprising the improvement therewith, that a coal or coal mixture with ingredients including one having volatile con-stituents up to 10%, which is formed up to 50% by weight of one or more mixture ingredients with up to 15% volatile constituents and a residue ingredient with up to 10% volatile constituents, being subjected to treatment in an atmosphere with 12 to 20.95% O2-portion for a duration of 30 sec. to 1 hr. at a temper-ature between 100° C and below ignition temperature thereof or for a duration of 5 to 30 seconds above ignition temperature thereof, whereby the water con-tent before or during the heat treatment is adjusted to a maximum of 3%.
11. A method according to claim 10, com-prising therewith that the coal or the coal mixture is subjected to said heat treatment at a temperature less than 20% below or up to 20% above the ignition temperature of the coal or the coal mixture.
12. A method according to claim 11, com-prising therewith that the quantity proportion less than 45 µ is greater than the quantity proportion 45 µ of the coal or coal mixture.
13. A method according to claim 12, com-prising therewith that the coal or coal mixture has a granular size less than 45 µ.
14. A method according to claim 13, com-prising therewith that the coal is heat treated in a fluidized bed chamber, a drum, a stream tube drier or upon a belt drier for a duration of more than 1 minute.
15. In a method of producing coal of a fine granu-lar size of up to 3.0 mm which is safe for trans-porting and storage, said method having improvement therewith in combination comprising the steps of:
providing coal in which the proportion thereof having a granular size of less than 45 µ is greater than the proportion thereof having a granular size of greater than 45 µ;
drying said coal in a main thermal treat-ment zone for attaining a maximum moisture content up to 3% by weight;
subjecting said coal to said thermal treatment at a temperature in a range of from 20%
below to 20% above said ignition temperature thereof;
carrying out said main thermal treat-ment in an atmosphere containing at least 12% O2 in an atmosphere in a range of 12% to 21% oxygen applied relative to said coal having up to 10% volatile con-stituents;
carrying out said main heat treatment for more than one minute utilizing a fluidized bed chamber, a drum, a stream tube drier or a belt drier;
and subjecting said coal for aging thereof additionally to further thermal treatment consisting of heating said coal for a time in a range of from 30 sec. to 1 hr. at a temperature in a range of be-tweew 100°C and a temperature which is slightly below the ignition temperature of said coal and including steps of heating said coal for from 5 to 30 sec., at a temperature which is above ignition temperature of said coal, and thereafter to a temperature slightly below said ignition temperature of said coal.
providing coal in which the proportion thereof having a granular size of less than 45 µ is greater than the proportion thereof having a granular size of greater than 45 µ;
drying said coal in a main thermal treat-ment zone for attaining a maximum moisture content up to 3% by weight;
subjecting said coal to said thermal treatment at a temperature in a range of from 20%
below to 20% above said ignition temperature thereof;
carrying out said main thermal treat-ment in an atmosphere containing at least 12% O2 in an atmosphere in a range of 12% to 21% oxygen applied relative to said coal having up to 10% volatile con-stituents;
carrying out said main heat treatment for more than one minute utilizing a fluidized bed chamber, a drum, a stream tube drier or a belt drier;
and subjecting said coal for aging thereof additionally to further thermal treatment consisting of heating said coal for a time in a range of from 30 sec. to 1 hr. at a temperature in a range of be-tweew 100°C and a temperature which is slightly below the ignition temperature of said coal and including steps of heating said coal for from 5 to 30 sec., at a temperature which is above ignition temperature of said coal, and thereafter to a temperature slightly below said ignition temperature of said coal.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3148813 | 1981-12-10 | ||
| DE3148812 | 1981-12-10 | ||
| DEP3148813.7-24 | 1981-12-10 | ||
| DEP3148812.9-24 | 1981-12-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1218849A true CA1218849A (en) | 1987-03-10 |
Family
ID=25797893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000417146A Expired CA1218849A (en) | 1981-12-10 | 1982-12-07 | Method of producing coal and coal mixtures which are safe to transport and to store |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0081763B1 (en) |
| CA (1) | CA1218849A (en) |
| DE (1) | DE3277019D1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3801800C1 (en) * | 1988-01-22 | 1989-08-24 | Gewerkschaft Sophia-Jacoba, 5142 Hueckelhoven, De | |
| US5863304A (en) * | 1995-08-15 | 1999-01-26 | Western Syncoal Company | Stabilized thermally beneficiated low rank coal and method of manufacture |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3723079A (en) * | 1971-07-23 | 1973-03-27 | Sun Research Development | Stabilization of coal |
| US3896557A (en) * | 1974-05-09 | 1975-07-29 | Sun Oil Co Delaware | Process for drying and stabilizing coal |
| US4192650A (en) * | 1978-07-17 | 1980-03-11 | Sunoco Energy Development Co. | Process for drying and stabilizing coal |
| US4199325A (en) * | 1978-11-22 | 1980-04-22 | Atlantic Richfield Company | Inhibiting spontaneous combustion of coal |
-
1982
- 1982-12-02 EP EP82111163A patent/EP0081763B1/en not_active Expired
- 1982-12-02 DE DE8282111163T patent/DE3277019D1/en not_active Expired
- 1982-12-07 CA CA000417146A patent/CA1218849A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0081763B1 (en) | 1987-08-19 |
| EP0081763A2 (en) | 1983-06-22 |
| EP0081763A3 (en) | 1984-08-29 |
| DE3277019D1 (en) | 1987-09-24 |
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