CA1153200A - Process for drying and modification of organic solid materials - Google Patents
Process for drying and modification of organic solid materialsInfo
- Publication number
- CA1153200A CA1153200A CA000365788A CA365788A CA1153200A CA 1153200 A CA1153200 A CA 1153200A CA 000365788 A CA000365788 A CA 000365788A CA 365788 A CA365788 A CA 365788A CA 1153200 A CA1153200 A CA 1153200A
- Authority
- CA
- Canada
- Prior art keywords
- steam
- solid materials
- atmosphere
- saturated
- tapped
- 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.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
Abstract:
For the purpose of drying organic solid materials, particularly browncoals, the preheated solid materials are continuously passed through at least one drying stage (2) operated with saturated steam and subjected to the action of the saturated steam at super-atmospheric pressure and at elevated temperature. The condensed water is as well as the water expelled from the solid materials are at least partially removed, whereupon the solid materials ale transferred into a steam atmosphere (4) at a temperature of the steam atmos-phere of at least 200°C and with supply of superheated steam.
The solid materials are centrifuged within this steam atmos-phere, the steam of this steam atmosphere being passed along a closed circle through at least one heat exchanger (6) for obtaining and/or maintaining the temperature of at least 200°C. Excess steam is tapped off the steam to be supplied to the heat exchanger (6) and supplied to the first drying stage (2) operated with saturated steam. Finally, the solid materials are, after having been centrifuged, removed from the steam atmosphere and pressure released, whereupon the solid materials are, if desired, immediately transferred to a hot briquetting plant (13).
For the purpose of drying organic solid materials, particularly browncoals, the preheated solid materials are continuously passed through at least one drying stage (2) operated with saturated steam and subjected to the action of the saturated steam at super-atmospheric pressure and at elevated temperature. The condensed water is as well as the water expelled from the solid materials are at least partially removed, whereupon the solid materials ale transferred into a steam atmosphere (4) at a temperature of the steam atmos-phere of at least 200°C and with supply of superheated steam.
The solid materials are centrifuged within this steam atmos-phere, the steam of this steam atmosphere being passed along a closed circle through at least one heat exchanger (6) for obtaining and/or maintaining the temperature of at least 200°C. Excess steam is tapped off the steam to be supplied to the heat exchanger (6) and supplied to the first drying stage (2) operated with saturated steam. Finally, the solid materials are, after having been centrifuged, removed from the steam atmosphere and pressure released, whereupon the solid materials are, if desired, immediately transferred to a hot briquetting plant (13).
Description
~ ~53ZOO
The present invention refers to a process for drying and modifying organic solid materials, particularly brown coals, by means of steam as well as to a preferred type of use of brown coals having been dried and modified according to this process. When drying brown coal it has been recognized that the frequently considerable humidity content of brown coal has it's origin in water absorbed within the capillaries but also in chemically bound water which can be removed only with great energy consumption when drying the coal by immediately heating the coal. It is already known that this water can be expelled by steam or also by hot water. There are also known processes which make it possible to perform the drying process in a semi-continuous manner. Such known processes have made in most cases an essentially better use of the energy supplied than the original Flei~ner-process, but the only problem of water removal was with this known processes only solved in an unsatisfying manner. With all these processes, the solid materials are, after having been dried under the action of saturated steam or hot water, subjected to a further drying operation and, respectively, a final drying operation by aeration. The obtained dried solid materials still show a water content which, however, i9 low.
The present invention particularly refers to a process for drying of organic solid materials, particularly brown coals, in which the preheated solid materials are continuously passed through a drying stage operated with saturated steam and are in this drying stage subjected to the action of saturated steam under superatmospheric pressure and elevated temperature. It is an object of the present invention to .
_ 2~ _ , ~1~3200 improve the drying effect achieved by such a process and to improve the economy of such a process and the invention essentially consists in that the solid materials are subsequently further dried in a steam atmosphere at a temperature of the steam atmosphere of at least 200C thereby supplying superheated steam and centrifuging the solid materials, in that the steam of the steam atmosphere is passed along a closed circuit through at least one heat exchanger for obtaining and, respectively, for maintaining the temperature of the steam atmosphere, in that the excessive portion of the steam to be supplied to the heat exchanger is tapped off and introduced into the drying stage operated with saturated steam and in that the solid materials are, after having been centrifuged, discharged from the steam atmosphere and pressure-released. In view of supplying superheated steam into the steam-atmosphere, the solid materials are treated within this steam-atmosphere under high temperatures so that the final water content of the solid materials is still further reduced. In view of centrifuging the solid materials, water removal from the solid materials is mechanically enhanced by the centrifugal force thus increasing the drying efficiency. By this measure, the solid materials are energetically activated so that, as has been found, the drying effect is substantially increased. When treating brown coals, centriuging and the energetic activation of the brown coal associated therewith has as an effect that bitumen contained in the brown coal is accumulated at the surface of the coal lumps or grains, so that the inflammability of the brown coal is improved. According to a preferred embodiment of the invention, ~ - 3 -i brown coals treated according to this process are fine-grain brown coal having a particle-size of l~m to 5 mm.
According to a further preferred embodiment of the invention, the steam passed along a closed circuit is passed within the steam atmosphere where the solid materials are centrifuged in countercurrent to the solid materials. The steam is entering the steam atmosphere where the solid materials are centrifuged as superheated steam and is there cooled by contact with the solid materials. This cooled steam, which flows out of the steam atmosphere and a portion of which is introduced into the drying stage operated with saturated steam, becomes, by contact with the solid materials releasing water, saturated steam at any rate. According to the invention the steam is, within the steam circuit, tapped from the steam atmosphere in form of saturated steam and supplied to the steam atmosphere in form of superheated steam.
The steam passed along a closed circuit can, according to the invention, be heated by external heat, for example by the flue gases of a boiler plant used for generating the steam required for the drying stage operated with saturated steam. In this manner, heat energy at disposal from the process itself is made use of, thus increasing the economy of the process.
According to the invention the steam atmosphere is conveniently maintained under a pressure of approximately 40 bar and has a temperature of 350 to 550C. The steam passed along a closed circuit can, in this case, be tapped off the steam atmosphere with a temperature of approximately 250C
.~ ~
,.
~1~3200 . ` be heated to a temperature of approximately 550C prior to being recycled into the steam atmosphere.
Saturated steam produced in a boiler-plant can be supplied to the drying stage operated with saturated steam.
According to a preferred embodiment of the invention, more than the excessive portion of the steam to be supplied into the heat exchanger is, however, tapped off and introduced into the drying stage operated with saturated steam, fresh steam, particularly fresh saturated steam, being supplied to the steam circuit at a position between the tap-off position and the heat exchanger. In this case it is possible to tap off from the steam circuit, however, the total amount of steam required for the drying stage operated with saturated steam. This provides the advantage that to the drying stage operated with saturated steam the steam is supplied with a higher temperature than the temperature of the steam coming from the boiler plant, because the steam passed along a closed circuit and being replenished by the steam coming from the boiler plant is again reheated within the heat exchanger and is introduced into the steam atmosphere.
In practice, the process according to the invention can be performed such, ihat fresh steam is supplied to the steam circuit in an amount corresponding to approximately 20~ of the amount of steam recycled into the steam atmosphere, the amount of steam tapped off the steam circuit and introduced into the drying stage operated with saturated steam approximately corresponding to 50% of the amount of steam recycled into the steam atmosphere and the amount of steam tapped off the steam atmosphere approximately corresponding to 130~ of the anount of steam recycled into the steam atmosphere.
:
.
~1~;3ZOO
A preferred use of brown coals dried and modified according to the process of the invention is, when using such coals for producing briquettes or for gas-production, is characterized in that the brown coals are, after having been pressure-released, used for gasification or briquetting in a still hot condition. On centrifuging, bitumen is accumulated on the surface of the coal grains. Such accumulation of bitumen on the surface of the coal grains provides a substantial advantage during subsequent briquetting, because the individual coal grains can better mutually be bounded on briquetting. When briquetting coals it is, of course, advantageous to add bitumen, but this measure can be omitted when working according to the process according to the invention. Benefication of the brown coal can, however, also be effected by gasification of the brown coals and also in this case the accumulation of bitumen on the surface of the coal grains results in essential advantages. In view of further water being removed from the solid materials within the steam atmosphere, the amount of steam is increased and at least the portion of steam resulting therefrom must be tapped off the steam circuit. In view of this tapped-off portion of steam being introduced into the drying-stage operated with saturated steam, this saturated steam can be used in the drying stage operated with saturated steam thus increasing the economy of the process. This is possible without further because the solids materials are pressure released only after having been centrifuged and, respectively, after having been discharged from the steam atmosphere.
The invention is further illustrated with reference to , ~- .
.
~15i3ZOO
~ figure of the drawing schematically illustrating drying of brown coal in a flow-chart.
The preheated brown coal is supplied into the drying stage 2 operated with saturated steam at 1 and is dehumidified there to a great extent by contact with saturated steam at a pressure of approximately 40 bar. After separation of the water foamed, the brown coal enters at 3 an atmosphere 4 of hot steam and is centrifuged within this atmosphere 4 under a pressure of approximately 40 bar which is maintained within this atmosphere. Steam is extracted from or tapped off this atmosphere at 5, fed through a heat exchanger 6 and recycled into the steam atmosphere 4 at 7, thereby closing the steam circuit. The solid materials are discharged at 8 and pressure released to atmospheric pressure within a pressure release stage 9. Steam is flowing out at 5 from the atmosphere 4 of hot steam with a temperature of approximately 250C, is then heated within the heat exchanger 6 and is at 7 recycled into the atmosphere 4 of the hot steam with a temperature of approximately 550C. The location 5, where steam is tapped off the steam atmosphere 4, is located adjacent the supply end 3 and the location 7, where steam is recycled into the steam atmosphere 4, is located adjacent the discharge end 8. Therefore the steam is flowing within the steam atmosphere 4 in countercurrent to the brown coal.
At the location 10, a portion of the steam is tapped off for being supplied into the drying stage 2 operated with saturated steam. This portion of steam corresponds to the whole amount of saturated steam required in the drying stage 2 operated with saturated steam. The amount of steam tapped .:
: `
. ` .
.
- . ' ~ ~53200 ~ is greater than the amount for whlch the amount of steam is increased by the water expelled from the brown coal within the steam atmosphere 4. Therefore, saturated steam coming from a boiler plant 11 is introduced at the location 12 into the steam circuit, thus compensating the amount of steam tapped off at the location ].0, which amount is exceeding the amount of steam expelled from the brown coal within the steam atmosphere.
The brown coal is supplied at the location 1 in form of fine grains having a particle size of l~m to 5 mm. The dried brown coal coming from the pressure-release station 9 is briquetted in a hot briquetting plant 13.
~0 ' ' ,, ' ' ~ : , . .
.
' '
The present invention refers to a process for drying and modifying organic solid materials, particularly brown coals, by means of steam as well as to a preferred type of use of brown coals having been dried and modified according to this process. When drying brown coal it has been recognized that the frequently considerable humidity content of brown coal has it's origin in water absorbed within the capillaries but also in chemically bound water which can be removed only with great energy consumption when drying the coal by immediately heating the coal. It is already known that this water can be expelled by steam or also by hot water. There are also known processes which make it possible to perform the drying process in a semi-continuous manner. Such known processes have made in most cases an essentially better use of the energy supplied than the original Flei~ner-process, but the only problem of water removal was with this known processes only solved in an unsatisfying manner. With all these processes, the solid materials are, after having been dried under the action of saturated steam or hot water, subjected to a further drying operation and, respectively, a final drying operation by aeration. The obtained dried solid materials still show a water content which, however, i9 low.
The present invention particularly refers to a process for drying of organic solid materials, particularly brown coals, in which the preheated solid materials are continuously passed through a drying stage operated with saturated steam and are in this drying stage subjected to the action of saturated steam under superatmospheric pressure and elevated temperature. It is an object of the present invention to .
_ 2~ _ , ~1~3200 improve the drying effect achieved by such a process and to improve the economy of such a process and the invention essentially consists in that the solid materials are subsequently further dried in a steam atmosphere at a temperature of the steam atmosphere of at least 200C thereby supplying superheated steam and centrifuging the solid materials, in that the steam of the steam atmosphere is passed along a closed circuit through at least one heat exchanger for obtaining and, respectively, for maintaining the temperature of the steam atmosphere, in that the excessive portion of the steam to be supplied to the heat exchanger is tapped off and introduced into the drying stage operated with saturated steam and in that the solid materials are, after having been centrifuged, discharged from the steam atmosphere and pressure-released. In view of supplying superheated steam into the steam-atmosphere, the solid materials are treated within this steam-atmosphere under high temperatures so that the final water content of the solid materials is still further reduced. In view of centrifuging the solid materials, water removal from the solid materials is mechanically enhanced by the centrifugal force thus increasing the drying efficiency. By this measure, the solid materials are energetically activated so that, as has been found, the drying effect is substantially increased. When treating brown coals, centriuging and the energetic activation of the brown coal associated therewith has as an effect that bitumen contained in the brown coal is accumulated at the surface of the coal lumps or grains, so that the inflammability of the brown coal is improved. According to a preferred embodiment of the invention, ~ - 3 -i brown coals treated according to this process are fine-grain brown coal having a particle-size of l~m to 5 mm.
According to a further preferred embodiment of the invention, the steam passed along a closed circuit is passed within the steam atmosphere where the solid materials are centrifuged in countercurrent to the solid materials. The steam is entering the steam atmosphere where the solid materials are centrifuged as superheated steam and is there cooled by contact with the solid materials. This cooled steam, which flows out of the steam atmosphere and a portion of which is introduced into the drying stage operated with saturated steam, becomes, by contact with the solid materials releasing water, saturated steam at any rate. According to the invention the steam is, within the steam circuit, tapped from the steam atmosphere in form of saturated steam and supplied to the steam atmosphere in form of superheated steam.
The steam passed along a closed circuit can, according to the invention, be heated by external heat, for example by the flue gases of a boiler plant used for generating the steam required for the drying stage operated with saturated steam. In this manner, heat energy at disposal from the process itself is made use of, thus increasing the economy of the process.
According to the invention the steam atmosphere is conveniently maintained under a pressure of approximately 40 bar and has a temperature of 350 to 550C. The steam passed along a closed circuit can, in this case, be tapped off the steam atmosphere with a temperature of approximately 250C
.~ ~
,.
~1~3200 . ` be heated to a temperature of approximately 550C prior to being recycled into the steam atmosphere.
Saturated steam produced in a boiler-plant can be supplied to the drying stage operated with saturated steam.
According to a preferred embodiment of the invention, more than the excessive portion of the steam to be supplied into the heat exchanger is, however, tapped off and introduced into the drying stage operated with saturated steam, fresh steam, particularly fresh saturated steam, being supplied to the steam circuit at a position between the tap-off position and the heat exchanger. In this case it is possible to tap off from the steam circuit, however, the total amount of steam required for the drying stage operated with saturated steam. This provides the advantage that to the drying stage operated with saturated steam the steam is supplied with a higher temperature than the temperature of the steam coming from the boiler plant, because the steam passed along a closed circuit and being replenished by the steam coming from the boiler plant is again reheated within the heat exchanger and is introduced into the steam atmosphere.
In practice, the process according to the invention can be performed such, ihat fresh steam is supplied to the steam circuit in an amount corresponding to approximately 20~ of the amount of steam recycled into the steam atmosphere, the amount of steam tapped off the steam circuit and introduced into the drying stage operated with saturated steam approximately corresponding to 50% of the amount of steam recycled into the steam atmosphere and the amount of steam tapped off the steam atmosphere approximately corresponding to 130~ of the anount of steam recycled into the steam atmosphere.
:
.
~1~;3ZOO
A preferred use of brown coals dried and modified according to the process of the invention is, when using such coals for producing briquettes or for gas-production, is characterized in that the brown coals are, after having been pressure-released, used for gasification or briquetting in a still hot condition. On centrifuging, bitumen is accumulated on the surface of the coal grains. Such accumulation of bitumen on the surface of the coal grains provides a substantial advantage during subsequent briquetting, because the individual coal grains can better mutually be bounded on briquetting. When briquetting coals it is, of course, advantageous to add bitumen, but this measure can be omitted when working according to the process according to the invention. Benefication of the brown coal can, however, also be effected by gasification of the brown coals and also in this case the accumulation of bitumen on the surface of the coal grains results in essential advantages. In view of further water being removed from the solid materials within the steam atmosphere, the amount of steam is increased and at least the portion of steam resulting therefrom must be tapped off the steam circuit. In view of this tapped-off portion of steam being introduced into the drying-stage operated with saturated steam, this saturated steam can be used in the drying stage operated with saturated steam thus increasing the economy of the process. This is possible without further because the solids materials are pressure released only after having been centrifuged and, respectively, after having been discharged from the steam atmosphere.
The invention is further illustrated with reference to , ~- .
.
~15i3ZOO
~ figure of the drawing schematically illustrating drying of brown coal in a flow-chart.
The preheated brown coal is supplied into the drying stage 2 operated with saturated steam at 1 and is dehumidified there to a great extent by contact with saturated steam at a pressure of approximately 40 bar. After separation of the water foamed, the brown coal enters at 3 an atmosphere 4 of hot steam and is centrifuged within this atmosphere 4 under a pressure of approximately 40 bar which is maintained within this atmosphere. Steam is extracted from or tapped off this atmosphere at 5, fed through a heat exchanger 6 and recycled into the steam atmosphere 4 at 7, thereby closing the steam circuit. The solid materials are discharged at 8 and pressure released to atmospheric pressure within a pressure release stage 9. Steam is flowing out at 5 from the atmosphere 4 of hot steam with a temperature of approximately 250C, is then heated within the heat exchanger 6 and is at 7 recycled into the atmosphere 4 of the hot steam with a temperature of approximately 550C. The location 5, where steam is tapped off the steam atmosphere 4, is located adjacent the supply end 3 and the location 7, where steam is recycled into the steam atmosphere 4, is located adjacent the discharge end 8. Therefore the steam is flowing within the steam atmosphere 4 in countercurrent to the brown coal.
At the location 10, a portion of the steam is tapped off for being supplied into the drying stage 2 operated with saturated steam. This portion of steam corresponds to the whole amount of saturated steam required in the drying stage 2 operated with saturated steam. The amount of steam tapped .:
: `
. ` .
.
- . ' ~ ~53200 ~ is greater than the amount for whlch the amount of steam is increased by the water expelled from the brown coal within the steam atmosphere 4. Therefore, saturated steam coming from a boiler plant 11 is introduced at the location 12 into the steam circuit, thus compensating the amount of steam tapped off at the location ].0, which amount is exceeding the amount of steam expelled from the brown coal within the steam atmosphere.
The brown coal is supplied at the location 1 in form of fine grains having a particle size of l~m to 5 mm. The dried brown coal coming from the pressure-release station 9 is briquetted in a hot briquetting plant 13.
~0 ' ' ,, ' ' ~ : , . .
.
' '
Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Process for drying and modifying of organic solid materials, particularly brown coals, in which the preheated solid materials are continuously passed through at least one drying stage operated with saturated steam and are in this drying stage subjected to the action of saturated steam under superatmospheric pressure and elevated temperature, the condensed water and the waste water expelled from the solid materials being at least partially discharged, characterized in that the solid materials are subsequently further dried in a steam atmosphere at a temperature of the steam atmosphere of at least 200°C thereby supplying superheated steam and centrifuging (4) the solid materials, in that the steam of the steam atmosphere is passed along a closed circuit through at least one heat exchanger (6) for obtaining and, respectively, for maintaining the temperature of the steam atmosphere, in that the excessive portion of the steam to be supplied to the heat exchanger (6) is tapped off and introduced into the drying stage (2) operated with saturated steam and in that the solid materials are, after having been centrifuged (4), discharged from the steam atmosphere and pressure-released.
2. Process as claimed in Claim 1, characterized in that the brown coals to be treated are used in form of fine grains having a particle size of 1mm to 5mm.
3. Process as claimed in Claim 1 or 2 characterized in that the steam passed along a closed circuit is passed within the steam atmosphere where the solid materials are centrifuged in countercurrent to the solid materials.
4. Process as claimed in claim 1 or 2, characterized in that the steam is, within the steam circuit, tapped from the steam atmosphere in the form of saturated steam and supplied to the steam atmosphere in the form of super-heated steam.
5. Process as claimed in claim 1 or 2, characterized in that the steam passed along a closed circuit is heated by external heat, for example by the flue gases of a boiler plant used for generating the steam required for the drying stage operated with saturated steam.
6. Process as claimed in claim 1 or 2, characterized in that the steam atmosphere is maintained under a pressure of approximately 40 bar and has a temperature of 350 to 550°C.
7. Process as claimed in claim 1 or 2, characterized in that the steam passed along a closed circuit is tapped off the steam atmosphere with a temperature of approximately 250°C. and is heated to a temperature of approximately 550°C. prior to being recycled into the steam atmosphere.
8. Process as claimed in claim 1 or 2, characterized in that more than the excessive portion of the steam to be supplied into the heat exchanger is tapped off and intro-duced into the drying stage operated with saturated steam, fresh steam, particularly fresh saturated steam, being supplied to the steam circuit at a position between the tap-off position and the heat exchanger.
9. Process as claimed in claim 1 or 2, characterized in that the total amount of steam required for the drying stage operated with saturated steam is tapped off from the steam circuit
10. Process as claimed in claim 1 or 2, characterized in that fresh steam is supplied to the steam circuit in an amount corresponding to approximately 20% of the amount of steam recycled into the steam atmosphere, the amount of steam tapped off the steam circuit and introduced into the drying stage operated with saturated steam approximately corresponding to 50% of the amount of steam recycled into the steam atmosphere and the amount of steam tapped off the steam atmosphere approximately corresponding to 130%
of the amount of steam recycled into the steam atmosphere.
of the amount of steam recycled into the steam atmosphere.
11. Process as claimed in claim 1 or 2 including the further step of immediately briquetting or gasifying said organic solid materials after said materials have been pressure-relieved and while still in a hot condition.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT31180A AT366090B (en) | 1980-01-21 | 1980-01-21 | METHOD FOR DRYING AND CONVERTING ORGANIC SOLIDS, IN PARTICULAR BROWN COALS, AND USE OF THE DRIED AND CONVERTED BROWN COALS IN THIS WAY |
| ATA311/80 | 1980-01-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1153200A true CA1153200A (en) | 1983-09-06 |
Family
ID=3487193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000365788A Expired CA1153200A (en) | 1980-01-21 | 1980-11-28 | Process for drying and modification of organic solid materials |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS56104996A (en) |
| AT (1) | AT366090B (en) |
| AU (1) | AU522318B2 (en) |
| CA (1) | CA1153200A (en) |
| DD (1) | DD157017A1 (en) |
| DE (1) | DE3045762C2 (en) |
| GB (1) | GB2067732B (en) |
| IN (1) | IN152919B (en) |
| PL (1) | PL131417B1 (en) |
| YU (1) | YU41759B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5757795A (en) * | 1980-09-24 | 1982-04-07 | Electric Power Dev Co Ltd | Thermal dehydration of organic solid |
| AT374491B (en) * | 1982-01-20 | 1984-04-25 | Voest Alpine Ag | METHOD FOR CONTINUOUS DRYING AND FINISHING OF ORGANIC SOLIDS, E.g. BROWN COALS |
| AU552638B2 (en) * | 1982-10-20 | 1986-06-12 | Idemitsu Kosan Co. Ltd | Process for modification of coal |
| AT380268B (en) * | 1983-11-15 | 1986-05-12 | Voest Alpine Ag | METHOD FOR THE DRAINAGE OF PORTS BY CENTRIFUGING UNDER SATURDAM |
| US4733478A (en) * | 1985-10-07 | 1988-03-29 | Kawasaki Jukogyo Kabushiki Kaisha | Method of dewatering brown coal |
| US5071447A (en) * | 1989-10-31 | 1991-12-10 | K-Fuel Partnership | Apparatus and process for steam treating carbonaceous material |
| AU9348601A (en) * | 2000-09-26 | 2002-04-08 | Tech Resources Pty Ltd | Upgrading solid material |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE713899C (en) * | 1938-09-23 | 1941-11-17 | Gustav Freimuth | Process for the operation of the drying of fine coals, slimes u. Like. Serving slings |
| AT244292B (en) * | 1963-03-29 | 1965-12-27 | Georges Joffe | Method and device for batch drying of colloidal substances, in particular lignite |
| AT260801B (en) * | 1965-04-09 | 1968-03-25 | Oesterr Alpine Montan | Process for drying colloidal substances and devices for carrying out the process |
-
1980
- 1980-01-21 AT AT31180A patent/AT366090B/en not_active IP Right Cessation
- 1980-11-18 IN IN1287/CAL/80A patent/IN152919B/en unknown
- 1980-11-28 CA CA000365788A patent/CA1153200A/en not_active Expired
- 1980-12-03 GB GB8038791A patent/GB2067732B/en not_active Expired
- 1980-12-04 DE DE19803045762 patent/DE3045762C2/en not_active Expired
-
1981
- 1981-01-07 AU AU66054/81A patent/AU522318B2/en not_active Ceased
- 1981-01-12 DD DD22693081A patent/DD157017A1/en unknown
- 1981-01-19 YU YU12781A patent/YU41759B/en unknown
- 1981-01-21 PL PL22929981A patent/PL131417B1/en unknown
- 1981-01-21 JP JP655681A patent/JPS56104996A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE3045762A1 (en) | 1982-02-18 |
| IN152919B (en) | 1984-05-05 |
| DD157017A1 (en) | 1982-10-06 |
| AT366090B (en) | 1982-03-10 |
| AU522318B2 (en) | 1982-05-27 |
| GB2067732B (en) | 1984-02-15 |
| GB2067732A (en) | 1981-07-30 |
| YU41759B (en) | 1987-12-31 |
| PL229299A1 (en) | 1981-09-04 |
| YU12781A (en) | 1983-09-30 |
| DE3045762C2 (en) | 1983-06-01 |
| ATA31180A (en) | 1981-07-15 |
| JPS56104996A (en) | 1981-08-21 |
| PL131417B1 (en) | 1984-11-30 |
| AU6605481A (en) | 1981-08-06 |
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