GB2067732A - Drying organic solid materials - Google Patents
Drying organic solid materials Download PDFInfo
- Publication number
- GB2067732A GB2067732A GB8038791A GB8038791A GB2067732A GB 2067732 A GB2067732 A GB 2067732A GB 8038791 A GB8038791 A GB 8038791A GB 8038791 A GB8038791 A GB 8038791A GB 2067732 A GB2067732 A GB 2067732A
- Authority
- GB
- United Kingdom
- Prior art keywords
- steam
- solid materials
- atmosphere
- tapped
- saturated
- 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.)
- Granted
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
For the purpose of drying organic solid materials, particularly brown coals, the preheated solid materials are continuously passed through at least one drying stage (2) and subjected to the action of saturated steam at super-atmospheric pressure and at elevated temperature. Condensed water and water expelled from the solid materials is at least partially removed, and the solid materials are transferred into a steam atmosphere (4) which is at a temperature of at least 200 DEG C and is supplied with superheated steam. The solid materials are centrifuged within this steam atmosphere, the steam of this steam atmosphere being passed along a closed circle 5 ... 7 through at least one heat exchanger (6) for obtaining and/or maintaining the temperature of at least 200 DEG C. Excess steam is tapped off at 10 and supplied to stage (2). Finally, the solid materials are, after having been centrifuged, removed from the steam atmosphere 4 and pressure-released at 9, whereupon the solid materials are, if desired, immediately transferred to a hot briquetting plant (13). <IMAGE>
Description
SPECIFICATION
Process for drying and modifying organic solid materials, particularly brown coals and use thereof
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 its 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 Fleissner-process, but the 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, is 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 improve the dryirig 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 2000C 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 steamatmosphere, 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, centrifuging and the energetic activation of the brown coal associated therewith has 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, the brown coals treated according to this process are finegrain brown coal having a particle-size of 1 Mm 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 5500 C. The steam passed along a closed circuit can, in this case, be tapped off the steam atmosphere with a temperature of approximately 2500C and be heated to a temperature of approximately 5500C 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, 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 steamatmosphere approximately corresponding to 130% of the amount of steam recycled into the steam atmosphere.
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 pressurereleased, 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 solid
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 the 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 2500C, is then heated within the heat exchanger 6 and is at 7 recycled into the atmosphere 4 of hot steam with a temperature of approximately 5500C. 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 off is greater than the amount for which 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 10, 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 1 ym to
5 mm. The dried brown coal coming from the pressure-release station 9 is briquetted in a hot briquetting plant 1 3.
Claims (12)
1. Process for drying and modifying of organic solid material 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 2000C 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 pressurereleased.
2. Process as claimed in claim 1, characterized in that the said organic material is a brown coal in the brown coals to be treated are used in form of fine grains having a particle size of 1 Mm to 5 mm.
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 any of claims 1, 2 or 3 characterized in that 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.
5. Process as claimed in any of claims 1 to 4, 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 (11) used for generating the steam required for the drying stage (2) operated with saturated steam.
6. Process as claimed in any of claims 1 to 5, characterized in that the steam atmosphere is maintained under a pressure of approximately 40 bar and has a temperature of 350 to 5500 C.
7. Process as claimed in any of claims 1 to 6, characterized in that the steam passed along a closed circuit is tapped off the steam atmosphere with a temperature of approximately 2500C and is heated to a temperature of approximately 5500C prior to being recycled into the steam atmosphere.
8. Process as claimed in any of claims 1 to 7, characterized in that more than the excessive portion of the steam to be supplied into the heat exchanger (6) is tapped off and introduced into the drying stage (2) operated with saturated steam, fresh steam, particularly fresh saturated steam, being supplied to the steam circuit at a position between the tap-off position (10) and the heat exchanger (6).
9. Process as claimed in any of claims 1 to 8, characterized in that the total amount of steam required for the drying stage (2) operated with saturated steam is tapped off from the steam circuit.
10. Process as claimed in claim 8 or 9, 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.
11. Process for drying and modifying organic solid materials as claimed in claim 1, substantially as hereinbefore described with particular reference to the accompanying drawing.
12. Use of brown coals dried and modified according to the process according to any of claims 1 to 11 for producing briquettes or for gas production, characterized in that the brown coals are, after having been pressure-released (9), used for briquetting (13) or gasification in a still hot condition.
Applications Claiming Priority (1)
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2067732A true GB2067732A (en) | 1981-07-30 |
GB2067732B GB2067732B (en) | 1984-02-15 |
Family
ID=3487193
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8038791A Expired GB2067732B (en) | 1980-01-21 | 1980-12-03 | Drying 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) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0143105A2 (en) * | 1983-11-15 | 1985-05-29 | VOEST-ALPINE Aktiengesellschaft | Process for dewatering peat |
US4645513A (en) * | 1982-10-20 | 1987-02-24 | Idemitsu Kosan Company Limited | Process for modification of coal |
EP0220013A2 (en) * | 1985-10-07 | 1987-04-29 | Kawasaki Jukogyo Kabushiki Kaisha | Method of dewatering brown coal |
EP0500744A1 (en) * | 1989-10-31 | 1992-09-02 | K Fuel Partnership | Apparatus and process for steam treating carbonaceous material. |
WO2002027251A1 (en) * | 2000-09-26 | 2002-04-04 | Technological Resources Pty Ltd | Upgrading solid material |
Families Citing this family (2)
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 |
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 JP JP655681A patent/JPS56104996A/en active Pending
- 1981-01-21 PL PL22929981A patent/PL131417B1/en unknown
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4645513A (en) * | 1982-10-20 | 1987-02-24 | Idemitsu Kosan Company Limited | Process for modification of coal |
EP0143105A2 (en) * | 1983-11-15 | 1985-05-29 | VOEST-ALPINE Aktiengesellschaft | Process for dewatering peat |
EP0143105A3 (en) * | 1983-11-15 | 1986-03-26 | VOEST-ALPINE Aktiengesellschaft | Process for dewatering peat |
EP0220013A2 (en) * | 1985-10-07 | 1987-04-29 | Kawasaki Jukogyo Kabushiki Kaisha | Method of dewatering brown coal |
EP0220013A3 (en) * | 1985-10-07 | 1988-03-02 | Kawasaki Jukogyo Kabushiki Kaisha | Method of dewatering brown coal |
EP0500744A1 (en) * | 1989-10-31 | 1992-09-02 | K Fuel Partnership | Apparatus and process for steam treating carbonaceous material. |
EP0500744A4 (en) * | 1989-10-31 | 1993-01-07 | K-Fuel Partnership | Apparatus and process for steam treating carbonaceous material |
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 |
Also Published As
Publication number | Publication date |
---|---|
JPS56104996A (en) | 1981-08-21 |
DE3045762C2 (en) | 1983-06-01 |
YU41759B (en) | 1987-12-31 |
DD157017A1 (en) | 1982-10-06 |
AU6605481A (en) | 1981-08-06 |
PL229299A1 (en) | 1981-09-04 |
IN152919B (en) | 1984-05-05 |
DE3045762A1 (en) | 1982-02-18 |
AT366090B (en) | 1982-03-10 |
PL131417B1 (en) | 1984-11-30 |
AU522318B2 (en) | 1982-05-27 |
CA1153200A (en) | 1983-09-06 |
GB2067732B (en) | 1984-02-15 |
ATA31180A (en) | 1981-07-15 |
YU12781A (en) | 1983-09-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |