CA2296273A1 - A process for drying granules and an arrangement for carrying out this process - Google Patents
A process for drying granules and an arrangement for carrying out this process Download PDFInfo
- Publication number
- CA2296273A1 CA2296273A1 CA 2296273 CA2296273A CA2296273A1 CA 2296273 A1 CA2296273 A1 CA 2296273A1 CA 2296273 CA2296273 CA 2296273 CA 2296273 A CA2296273 A CA 2296273A CA 2296273 A1 CA2296273 A1 CA 2296273A1
- Authority
- CA
- Canada
- Prior art keywords
- dryer
- conveyor
- granules
- starting material
- discharge unit
- 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.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/026—Arrangements for charging or discharging the materials to be dried, e.g. discharging by reversing drum rotation, using spiral-type inserts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
- F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to process for the production of granules, more particularly surfactant-containing granules, from a moist starting material in an air-flow dryer (1), the granules dried in the dryer (1) being discharged onto a conveyor (3) by a discharge unit (2) sloping away from the dryer (1). In order to provide a simple and inexpensive process in which overgranulation is avoided, it is proposed that the residence time of the starting material in the dryer (1) be controlled through the speed of the conveyor (3). The invention also relates to an arrangement for carrying out the process.
Description
A Process for Drying Granules and an Arrangement for Carrying Out this Process Field of the Invention This invention relates to a process for the production of granules, more particularly surfactant-containing granules, from a moist starting material in an air-flow dryer, the granules dried in the dryer being discharged onto a conveyor by a discharge unit sloping away from the dryer. The invention also relates to an arrangement for carrying out this process.
Background of the Invention In the production of granules of high surfactant content, as for example in the production of detergents, the construction of the dryer has a critical bearing on the quality of the granules and the safety of the granulation process. If, in the air-flow dryer, the granules are transported by an air stream directed towards the dryer entrance near the base of the dryer, overgranulation of the particles occurs in the dryer. The coarse fractions gradually increase in size in the dryer to such an extent that the dryer has to be shut down for cleaning after only a short time.
If, by contrast, the air stream is directed towards the dryer exit, overgranulation does not occur. In this case, however, the design of the dryer exit or discharge zone is problematical. In the dryers known from the prior art, weirs are arranged in the discharge zone. If the discharge weir is operated on the overflow principle, the coarse fractions collect in front of the weir and overgranulate so that the granulation unit again has to be shut down after only a short time to enable the coarse fractions to be removed from the dryer. If, by contrast, the weir is operated on the underflow principle, starting material which has not been fully dried can be discharged from the dryer. The granules positively "shoot through".
Where this procedure is adopted, the water contents of the granules vary so considerably that a uniform product is almost impossible to obtain. In addition, starting-up of the dryer is critical and very difficult to control.
In addition, it is known that a feed screw or rotary feeder can be provided at the dryer exit to eliminate the above-mentioned problems involved in operating the dryer with a terminal weir. However, it has been found in practice that granules of high surfactant content block discharge units of this type after only a brief period of operation so that the discharge units have to be laboriously and expensively cleaned.
Against this background, the technical problem addressed by the present invention was to improve a process for the production and subsequent drying of granules in such a way that a uniform product and uniform production of the granules would be guaranteed and no unwanted overgranulation would occur. Another problem addressed by the invention was to provide an arrangement operating by this process.
Brief Description of the Invention The solution to this problem as provided by the invention is characterized in that the residence time of the starting material in the dryer is controlled through the speed of the conveyor.
Accordingly, the process according to the invention is distinguished by the fact that the residence time of the starting material to be dried in the dryer is not controlled by the air stream used for drying or by internals in the dryer, but instead by the speed of the conveyor and hence by the rate at which the product is removed from the dryer. Because there are no internals in the dryer, the problems they cause do not arise. In addition, there is none of the unwanted overgranulation known from the prior art which normally leads to early shutdown of the dryer for labor-intensive and expensive cleaning. In addition, the control of the residence time in accordance with the invention through the speed of the conveyor represents a particularly simple and inexpensive method of operation. The resulting uniform operation of the dryer enables production capacity to be increased.
Background of the Invention In the production of granules of high surfactant content, as for example in the production of detergents, the construction of the dryer has a critical bearing on the quality of the granules and the safety of the granulation process. If, in the air-flow dryer, the granules are transported by an air stream directed towards the dryer entrance near the base of the dryer, overgranulation of the particles occurs in the dryer. The coarse fractions gradually increase in size in the dryer to such an extent that the dryer has to be shut down for cleaning after only a short time.
If, by contrast, the air stream is directed towards the dryer exit, overgranulation does not occur. In this case, however, the design of the dryer exit or discharge zone is problematical. In the dryers known from the prior art, weirs are arranged in the discharge zone. If the discharge weir is operated on the overflow principle, the coarse fractions collect in front of the weir and overgranulate so that the granulation unit again has to be shut down after only a short time to enable the coarse fractions to be removed from the dryer. If, by contrast, the weir is operated on the underflow principle, starting material which has not been fully dried can be discharged from the dryer. The granules positively "shoot through".
Where this procedure is adopted, the water contents of the granules vary so considerably that a uniform product is almost impossible to obtain. In addition, starting-up of the dryer is critical and very difficult to control.
In addition, it is known that a feed screw or rotary feeder can be provided at the dryer exit to eliminate the above-mentioned problems involved in operating the dryer with a terminal weir. However, it has been found in practice that granules of high surfactant content block discharge units of this type after only a brief period of operation so that the discharge units have to be laboriously and expensively cleaned.
Against this background, the technical problem addressed by the present invention was to improve a process for the production and subsequent drying of granules in such a way that a uniform product and uniform production of the granules would be guaranteed and no unwanted overgranulation would occur. Another problem addressed by the invention was to provide an arrangement operating by this process.
Brief Description of the Invention The solution to this problem as provided by the invention is characterized in that the residence time of the starting material in the dryer is controlled through the speed of the conveyor.
Accordingly, the process according to the invention is distinguished by the fact that the residence time of the starting material to be dried in the dryer is not controlled by the air stream used for drying or by internals in the dryer, but instead by the speed of the conveyor and hence by the rate at which the product is removed from the dryer. Because there are no internals in the dryer, the problems they cause do not arise. In addition, there is none of the unwanted overgranulation known from the prior art which normally leads to early shutdown of the dryer for labor-intensive and expensive cleaning. In addition, the control of the residence time in accordance with the invention through the speed of the conveyor represents a particularly simple and inexpensive method of operation. The resulting uniform operation of the dryer enables production capacity to be increased.
In one practical embodiment of the invention, starting material which has not been fully dried is prevented from being discharged during the start-up phase of the dryer by the installation of an adjustable weir at the dryer exit towards the discharge path in such a way that the weir is completely closed during the start-up phase of the dryer and is opened in stages after the build-up of a predetermined layer height in the dryer and fully opened on completion of the start-up phase.
So far as the productivity or the production capacity of a granulator is concerned, it is very important that the granulator as a whole can be uniformly operated without interruption in the vicinity of its full possession or occupation level. The possession or filling level of the discharge unit as the link between dryer and conveyor plays a critical role in this regard.
Accordingly, in one embodiment of the process, the speed of the conveyor is controlled during opening of the weir in such a way that complete filling of the discharge unit is guaranteed.
Detailed Description of the Invention The granulation process is an integrated process from the introduction of the product to be granulated into the dryer to the sieving of the granules. The quality of the product is critically determined by the sieving phase. On the other hand, the operation of the sieve determines the output of the entire process stage. Accordingly, it is crucially important to utilize the full capacity of the sieve and to operate the sieve uniformly.
Since the sieve is fed by the conveyor and since on the other hand the residence time of the starting material in the dryer is controlled by the speed of the conveyor, taking the occupation level of the sieve into account can also determine the quantity in which the starting material to be granulated is added. In one particularly advantageous embodiment of the process, therefore, uniform utilization of the full sieve capacity is additionally taken into account in the control of the conveyor speed and, if necessary, addition of the starting product to be granulated is controlled to maintain a predetermined height of the granules in the dryer.
The arrangement for drying granules by the process according to the invention is distinguished by the fact that the discharge unit is in the form of a chute. In preferred embodiments of the present invention, this chute has a U-shaped cross-section. In order to avoid clogging in the chute, the chute may be provided with plastic liners or air-flow plates. It is also possible to use cloths which may be mechanically or pneumatically moved, for example in the same way as the plastic liners. By using a simple chute as the discharge unit, the discharge unit sloping towards the conveyor can be completely filled with granules starting from the dryer so that, through the operation of the conveyor, the granules on the discharge unit are carried away by the conveyor and, at the same time, new granules pass onto the sloping discharge unit from the dryer. Accordingly, it is possible in this way to control the removal of the granules from the dryer and hence the residence time of the starting material to be dried in the dryer solely through the speed of the conveyor. An adjustable weir is preferably provided at the dryer exit towards the discharge unit.
In another embodiment of the invention, the dryer is in the form of a rotating drum and the speed of the conveyor is adjustable in relation to the rotational speed of the drum. Through this adjustment of the speed of the conveyor and hence the rate at which the dried granules are removed from the drum in relation to the rotational speed of the drum, it is possible -knowing the moisture content of the starting material and the flow rate of the drying air - to adjust the dryer in such a way that the granules always have a uniform moisture content. Finally, in another embodiment of the invention, the dryer is in the form of a fluidized bed dryer. The use of a fluidized bed dryer enables the moist starting material to be dried quickly, uniformly and inexpensively.
Other features and advantages of the invention will become apparent from the following description of the accompanying drawing which schematically illustrates one example of embodiment of an arrangement according to the invention for carrying out the process for the production of granules.
The illustrated arrangement consists of a dryer 1, a discharge unit 5 in the form of a chute 2 installed at the dryer exit and a conveyor 3 for carrying away the granules discharged from the dryer 1 via the chute 2.
To dry the starting product, the moist starting material is delivered to the dryer 1, for example in the form of a rotating drum, and is dried in the dryer 1 by an air stream L. The granules carried away by the conveyor 3 are delivered to following sieves (not shown) with various mesh widths to produce a product in a uniform particle size band.
At the beginning of the process, the conveyor 3 is stationary until the chute 2 is completely filled with the granular product to be discharged.
The conveyor 3 is then started up to carry away the granules. Through the operation of the conveyor 3, the granular product filling the chute 2 is carried away while newly formed granules are continuously delivered to the chute 2 from the dryer. Accordingly, the emptying rate of the dryer 1 and hence the residence time of the starting material to be dried in the dryer 1 can be controlled in a simple manner through the speed of the conveyor 3.
Through the complete opening of the weir 4 at the end of the start-up phase, there is no longer any overgranulation and formation of coarse fractions in the dryer 1. In addition, it is possible through the control of the speed of the conveyor 3 to keep the filling level of the dryer 1 constant and to make the feeding of the sieves following the conveyor more uniform.
In overall terms, therefore, the arrangement described in the foregoing is distinguished by the fact that, even with products of high surfactant content, the drying process can be managed in such a way that there is no overgranulation of coarse fractions which necessitate early cleaning of the dryer 1. In addition, it is possible through the control of the residence time of the starting material in the dryer 1 in dependence upon the speed of the conveyor 3 to load the sieves following the conveyor 3 more uniformly with the granular product and thus to achieve virtually optimal utilization of their capacity.
Besides the illustrated embodiment of the dryer 1 as a rotating drum, the dryer 1 may assume other forms, for example a fluidized bed dryer. The embodiment of the dryer as a fluidized bed dryer is preferred for the purposes of the present invention. According to the invention, the fluidized bed dryer may be divided up into various zones and both the volume of air flowing through the individual zones and the temperatures prevailing in the individual zones may be freely selected. Where the dryer is divided up into zones, it is particularly preferred to use the first zones for drying and the last zones for cooling.
Fluidized bed dryers in which the material to be dried is transported to the discharge unit 2 by directed air flow, by inclination or by vibration are preferred for the purposes of the invention. The base plate of a corresponding fluidized bed dryer may be inclined, advantageously at an angle of >0° to <10°. However, the base plate may also be provided with openings which allow an air stream to pass through towards the discharge unit. The base plate may also be perforated or valued where the dryer is of the agitated type (vibrating fluidized bed).
List of reference numerals 1 Dryer 2 Discharge path/chute 3 Conveyor 4 Weir L Air stream
So far as the productivity or the production capacity of a granulator is concerned, it is very important that the granulator as a whole can be uniformly operated without interruption in the vicinity of its full possession or occupation level. The possession or filling level of the discharge unit as the link between dryer and conveyor plays a critical role in this regard.
Accordingly, in one embodiment of the process, the speed of the conveyor is controlled during opening of the weir in such a way that complete filling of the discharge unit is guaranteed.
Detailed Description of the Invention The granulation process is an integrated process from the introduction of the product to be granulated into the dryer to the sieving of the granules. The quality of the product is critically determined by the sieving phase. On the other hand, the operation of the sieve determines the output of the entire process stage. Accordingly, it is crucially important to utilize the full capacity of the sieve and to operate the sieve uniformly.
Since the sieve is fed by the conveyor and since on the other hand the residence time of the starting material in the dryer is controlled by the speed of the conveyor, taking the occupation level of the sieve into account can also determine the quantity in which the starting material to be granulated is added. In one particularly advantageous embodiment of the process, therefore, uniform utilization of the full sieve capacity is additionally taken into account in the control of the conveyor speed and, if necessary, addition of the starting product to be granulated is controlled to maintain a predetermined height of the granules in the dryer.
The arrangement for drying granules by the process according to the invention is distinguished by the fact that the discharge unit is in the form of a chute. In preferred embodiments of the present invention, this chute has a U-shaped cross-section. In order to avoid clogging in the chute, the chute may be provided with plastic liners or air-flow plates. It is also possible to use cloths which may be mechanically or pneumatically moved, for example in the same way as the plastic liners. By using a simple chute as the discharge unit, the discharge unit sloping towards the conveyor can be completely filled with granules starting from the dryer so that, through the operation of the conveyor, the granules on the discharge unit are carried away by the conveyor and, at the same time, new granules pass onto the sloping discharge unit from the dryer. Accordingly, it is possible in this way to control the removal of the granules from the dryer and hence the residence time of the starting material to be dried in the dryer solely through the speed of the conveyor. An adjustable weir is preferably provided at the dryer exit towards the discharge unit.
In another embodiment of the invention, the dryer is in the form of a rotating drum and the speed of the conveyor is adjustable in relation to the rotational speed of the drum. Through this adjustment of the speed of the conveyor and hence the rate at which the dried granules are removed from the drum in relation to the rotational speed of the drum, it is possible -knowing the moisture content of the starting material and the flow rate of the drying air - to adjust the dryer in such a way that the granules always have a uniform moisture content. Finally, in another embodiment of the invention, the dryer is in the form of a fluidized bed dryer. The use of a fluidized bed dryer enables the moist starting material to be dried quickly, uniformly and inexpensively.
Other features and advantages of the invention will become apparent from the following description of the accompanying drawing which schematically illustrates one example of embodiment of an arrangement according to the invention for carrying out the process for the production of granules.
The illustrated arrangement consists of a dryer 1, a discharge unit 5 in the form of a chute 2 installed at the dryer exit and a conveyor 3 for carrying away the granules discharged from the dryer 1 via the chute 2.
To dry the starting product, the moist starting material is delivered to the dryer 1, for example in the form of a rotating drum, and is dried in the dryer 1 by an air stream L. The granules carried away by the conveyor 3 are delivered to following sieves (not shown) with various mesh widths to produce a product in a uniform particle size band.
At the beginning of the process, the conveyor 3 is stationary until the chute 2 is completely filled with the granular product to be discharged.
The conveyor 3 is then started up to carry away the granules. Through the operation of the conveyor 3, the granular product filling the chute 2 is carried away while newly formed granules are continuously delivered to the chute 2 from the dryer. Accordingly, the emptying rate of the dryer 1 and hence the residence time of the starting material to be dried in the dryer 1 can be controlled in a simple manner through the speed of the conveyor 3.
Through the complete opening of the weir 4 at the end of the start-up phase, there is no longer any overgranulation and formation of coarse fractions in the dryer 1. In addition, it is possible through the control of the speed of the conveyor 3 to keep the filling level of the dryer 1 constant and to make the feeding of the sieves following the conveyor more uniform.
In overall terms, therefore, the arrangement described in the foregoing is distinguished by the fact that, even with products of high surfactant content, the drying process can be managed in such a way that there is no overgranulation of coarse fractions which necessitate early cleaning of the dryer 1. In addition, it is possible through the control of the residence time of the starting material in the dryer 1 in dependence upon the speed of the conveyor 3 to load the sieves following the conveyor 3 more uniformly with the granular product and thus to achieve virtually optimal utilization of their capacity.
Besides the illustrated embodiment of the dryer 1 as a rotating drum, the dryer 1 may assume other forms, for example a fluidized bed dryer. The embodiment of the dryer as a fluidized bed dryer is preferred for the purposes of the present invention. According to the invention, the fluidized bed dryer may be divided up into various zones and both the volume of air flowing through the individual zones and the temperatures prevailing in the individual zones may be freely selected. Where the dryer is divided up into zones, it is particularly preferred to use the first zones for drying and the last zones for cooling.
Fluidized bed dryers in which the material to be dried is transported to the discharge unit 2 by directed air flow, by inclination or by vibration are preferred for the purposes of the invention. The base plate of a corresponding fluidized bed dryer may be inclined, advantageously at an angle of >0° to <10°. However, the base plate may also be provided with openings which allow an air stream to pass through towards the discharge unit. The base plate may also be perforated or valued where the dryer is of the agitated type (vibrating fluidized bed).
List of reference numerals 1 Dryer 2 Discharge path/chute 3 Conveyor 4 Weir L Air stream
Claims (19)
1. A process for the production of granules from a moist, starting material which comprises:
a) contacting the moist starting material with a flow of air in a dryer to form dried granules;
b) discharging the dried granules from the dryer onto a conveyor through a discharge conduit sloping toward the conveyor, the discharge conduit containing granules up to a level of granules in the dryer; and c) adjusting the conveying rate of the conveyor to control a residence time of the granules in the dryer.
a) contacting the moist starting material with a flow of air in a dryer to form dried granules;
b) discharging the dried granules from the dryer onto a conveyor through a discharge conduit sloping toward the conveyor, the discharge conduit containing granules up to a level of granules in the dryer; and c) adjusting the conveying rate of the conveyor to control a residence time of the granules in the dryer.
2. The process as claimed in claim 1, wherein an adjustable weir (4) is arranged at a dryer opening towards the discharge conduit (2), and the weir (4) is completely closed during the start-up phase of the dryer operation (1) and is opened in stages after a build-up of a predetermined granule height in the dryer and fully opened on completion of the start-up phase.
3. The process as claimed in claim 2, wherein the conveying rate of the conveyor (3) is controlled during opening of the weir (4) so that complete filling of the discharge unit (2) is accomplished.
4. The process as claimed in claim 1, wherein the conveying rate of the conveyor (3) is controlled for uniform utilization of the capacity of a following size separation zone and, if necessary, a rate of addition of the moist starting material to be dried is controlled to maintain the granule level in the dryer (1).
5. An apparatus for the production of granules from a moist starting material comprising a dryer (1) and a sloping discharge unit (2) for discharging the granules from the dryer onto a conveyor (3), wherein the discharge unit (2) comprises a chute.
6. The apparatus as claimed in claim 5, wherein the discharge unit (2) has a U-shaped cross-section.
7. The apparatus as claimed in claim 5 having an adjustable weir (4) arranged at a dryer exit adjacent the discharge unit (2).
8. The apparatus as claimed in claim 5 wherein the dryer (1) comprises a rotating drum and wherein the conveying rate of the conveyor (3) is adjustable to the rotational speed of the drum.
9. The apparatus as claimed in claim 5 wherein the dryer (1) is a fluidized bed dryer.
10. The apparatus as claimed in claim 9 wherein the dryer (1) is a fluidized bed dryer in which the starting material to be dried is transported to the discharge unit (2) by at least one means selected from the group consisting of a directed air stream, by inclination of the dryer and by vibration of the dryer.
11. The process of claim 2 wherein a conveying rate of the conveyor (3) is controlled for uniform utilization of the capacity of a following size separation zone and, if necessary, a rate of addition of the moist starting material to be dried is controlled to maintain the granule level in the dryer (1).
12. The process of claim 3 wherein the conveying rate of the conveyor (3) is controlled for uniform utilization of the capacity of a following size separation zone and, if necessary, a rate of addition of the moist starting material to be dried is controlled to maintain the granule level in the dryer (1).
13. The apparatus of claim 6 having an adjustable weir (4) arranged at a dryer exit adjacent the discharge unit (2).
14. The apparatus of claim 6 wherein the dryer (1) comprises a rotating drum and wherein the conveying rate of the conveyor (3) is adjustable to the rotational speed of the drum.
15. The apparatus of claim 7 wherein the dryer (1) comprises a rotating drum and wherein the conveying rate of the conveyor (3) is adjustable to the rotational speed of the drum.
16. The apparatus of claim 6 wherein the dryer (1) is a fluidized bed dryer.
17. The apparatus of claim 7 wherein the dryer (1) is a fluidized bed dryer.
18. The apparatus of claim 5 wherein the conveyor comprises a belt conveyor.
19. The apparatus of claim 5 further comprising a size separation zone.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19902424.3 | 1999-01-22 | ||
| DE1999102424 DE19902424B4 (en) | 1999-01-22 | 1999-01-22 | Process for drying granules and apparatus for carrying out this process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2296273A1 true CA2296273A1 (en) | 2000-07-22 |
Family
ID=7895038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2296273 Abandoned CA2296273A1 (en) | 1999-01-22 | 2000-01-19 | A process for drying granules and an arrangement for carrying out this process |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU2904800A (en) |
| CA (1) | CA2296273A1 (en) |
| DE (1) | DE19902424B4 (en) |
| WO (1) | WO2000043718A1 (en) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2439741A (en) * | 1943-04-28 | 1948-04-13 | Davison Chemical Corp | Process for controlling drier discharge |
| GB834738A (en) * | 1957-03-29 | 1960-05-11 | Svenska Flaektfabriken Ab | Improvements in or relating to the conditioning of grain and the like |
| US3101936A (en) * | 1960-08-08 | 1963-08-27 | Phillips Petroleum Co | Rotary dryer operation under emergency conditions |
| DE1280200B (en) * | 1961-05-08 | 1968-10-17 | Haas Friedrich Maschf | Dryer for loose fiber material |
| CH422652A (en) * | 1964-10-08 | 1966-10-15 | Glatt Werner | Device for the treatment of granular or fine-grained material in an air stream |
| US3603001A (en) * | 1969-03-17 | 1971-09-07 | Gerald D Arnold | Agricultural dehydrating and cooling system |
| DE1929893A1 (en) * | 1969-06-12 | 1971-02-04 | Buettner Schible Haas Ag | Rotary dryer for gases and solids |
| US5302118A (en) * | 1993-02-08 | 1994-04-12 | Astec Industries, Inc. | Soil remediation apparatus |
| GB2290117B (en) * | 1994-06-09 | 1997-12-03 | British American Tobacco Co | Improvements relating to airlocks |
-
1999
- 1999-01-22 DE DE1999102424 patent/DE19902424B4/en not_active Expired - Fee Related
-
2000
- 2000-01-13 AU AU29048/00A patent/AU2904800A/en not_active Abandoned
- 2000-01-13 WO PCT/EP2000/000201 patent/WO2000043718A1/en active Application Filing
- 2000-01-19 CA CA 2296273 patent/CA2296273A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE19902424B4 (en) | 2011-08-18 |
| AU2904800A (en) | 2000-08-07 |
| WO2000043718A1 (en) | 2000-07-27 |
| DE19902424A1 (en) | 2000-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2441752C2 (en) | Method and device for processing polymer material | |
| US4204855A (en) | Apparatus for dewatering granulated-slag slurry | |
| US4040190A (en) | Method and apparatus for drying manure or mud or the like | |
| US3469323A (en) | Process and device for screening and drying a plastics granulate obtained by wet granulation | |
| US2331102A (en) | Sand treating system and method | |
| EP0441092A1 (en) | A method and apparatus for heat treating a particulate product | |
| US6347707B1 (en) | Sifting device for sifting granular material | |
| JP2640038B2 (en) | Interstage separator | |
| US2982411A (en) | Moisture separation from granular materials | |
| US3900958A (en) | Method and apparatus for continuously drying a dripping wet, granular or lumpy material | |
| JP2588810B2 (en) | Two-stage pneumatic transport method for rubber cooling. | |
| KR101916566B1 (en) | Extrusion molding device, dried-pellet manufacturing device, and method for extrusion molding and for manufacturing dried-pellet using the same | |
| JP2014073484A (en) | Continuous system for kneading, granulating, and drying | |
| CA2296273A1 (en) | A process for drying granules and an arrangement for carrying out this process | |
| JPH0638680A (en) | Device and method for moistening and dissolving dry particle | |
| WO2004051166A2 (en) | Combined dewatering, drying and control of particle size of solids | |
| JP2003320308A (en) | Sieving method for granulated matter of hydraulic powder and apparatus therefor | |
| JPS628256B2 (en) | ||
| US4630382A (en) | Discharge device for granules | |
| US20020104232A1 (en) | Device and method for treating plastic material | |
| US2330542A (en) | Dewatering of suspended solids | |
| JP7138878B1 (en) | Recycled resin granulation system | |
| RU2114945C1 (en) | Method of heat treatment of line slime and plant for its embodiment | |
| RU2286519C1 (en) | Continuous effect drier for milled polymer wastes | |
| RU2080169C1 (en) | Drum granulator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |