CA1040419A - Drum and disc dryer - Google Patents
Drum and disc dryerInfo
- Publication number
- CA1040419A CA1040419A CA200,090A CA200090A CA1040419A CA 1040419 A CA1040419 A CA 1040419A CA 200090 A CA200090 A CA 200090A CA 1040419 A CA1040419 A CA 1040419A
- Authority
- CA
- Canada
- Prior art keywords
- spiral
- hollow space
- rotor
- hollow
- rib
- 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
Landscapes
- Drying Of Solid Materials (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A heat exchanger for indirect heating or cooling of moist, tacky material is described, comprising a stationary drum with an internal hollow shaft or rotor with means for circulating heating or cooling medium, said rotor being encircled by annular bodies in the shape of ribs with a spiral, hollow space, the inner end of which communicates with the interior of the rotor, the outer end being closed.
A heat exchanger for indirect heating or cooling of moist, tacky material is described, comprising a stationary drum with an internal hollow shaft or rotor with means for circulating heating or cooling medium, said rotor being encircled by annular bodies in the shape of ribs with a spiral, hollow space, the inner end of which communicates with the interior of the rotor, the outer end being closed.
Description
~.o404~9 rrhis invention relates to an apparatus in the shape of a heat exchanger for indirect heating, drying or cooliny o moist taclcy material, said apparatus being of the kind having a stationary drum with a revolving hollow shaft or rotor with an inlet for a drying medium and an outlet for the same or a condensate thereof, the rotor carrying annular bodies with cavities connected to the hollow space of the rotor.
An apparatus of the said kind will speciPically lo be use~ul in the drying o~` ~ishmeal, offal ~rom slaught-erhouses, mash ~rom breweries, and the like tacky ma-terial o~ animal or vegetable originO
Formerly, materials of the said kind were dried by means of direct fired air driers, but since the mate-SCnS; f;vC
~ ~ 15 rials are often heat sensi~le and in1ammable when dried, `:~
;~ driers of this kind have been abandoned in favour o~
¦ driers with indirect heating.
Thus, drum driers with longitudinal pipes have been used, wherein the drum and the pipes rotate to-~¦ 20 gether or, as according to the Norwegian Patent No.
.... ,;
, 62.174, the drums are stationary being fitted with also ~.1 stationary heating pipes coiled in planes perpendicular to the drum axis, and with rotating stirring members ~;~ mounted upon a central shaft, and moving between the 1 25 coils. In another embodiment according to the same Sp;~a //y patent, the heating pipes are hclically coiled and mount-¦ ed upon a rotating hollow shaft.
These apparatus types are not suited for drying of ~ ., ;. ~
~-` tacky materials, because their ef~ectivity is rapidly decreased owing to the material forming deposits on the ~' ,.
.
104~419 pipes, which are removed only with difficulty, and be-~c n ~ v c cause the materials, if heat ~en3iblc, will be damaged, unless the temperature of the heating medium is limited to values below the scorching temperature of the mate-rial in question. The deposits will also often be of poor heat conductivity.
In the Norwegian Patent No. 95.490, therefore, a dryer has been proposed, having a stationary drum en-closing a hollow rotor encircled by hollow annular bo-lo dies of triangular cross section, so that only smooth surfaces come into contact with the material to be dried.
Possible deposits on such smooth surfàces are relatively easily detached during the movement of the surfaces in the material to be dried, even as the possibility exists l 15 of providing stationary reamers.
;~ The said design has various disadvantages. Thus, I smooth surfaces as those of the said annular bodies are not very resistant to pressure, and because pressurized steam is yenerally used as a heating medium, the bodies have either to be made from heavy sheet material, which involves weight problems, or, as is usual in the appa-ratuses used in practise, stays have to be welded in between the two frustoconical sheets making up one such annular body. This welding of stays is dif~icult to me-~j 25 chanize and since as many as 90 stays are used in each ¦ body, this contrivance is very costly.
;l Further, the cross-sectionally triangular design of the annular bodies makes them bulky so that only a limit-ed number of bodies can find room on the hollow rotor, and the effective space for reception of the material to be dried is reduced.
~he object of the invention is to provide a dryer sub-s-tantially relieving the said disadvantayes, being con-structionally so designed that the manufacture thereof can be largely mechanized and automatically carried through.
With this object in view, the characteristic feature of the drier of the invention is that the annular bodies S~o;ra t A encircling the rotor are designed as ribs with a hclical hollow space, the inner end of which is in connection with the interior of the rotor, the outer end near the lo circumference of the rib being closed.
This design is based upon the recognition that the heat transmission number between heating surface and drying goods for the materials dealt with here is so low, 20 - 60 kcal/m2hC, that a fin or rib design as stated hereinbefore, where only part of the surface is directly heated, is effective. Owing to the small cross-sectional area of the heating coil and its confinement within curved surfaces, it will endure a relatively high pressure of the heating medium without any need for additional bracing.
Since the heating coil is preferably of lenticular cross-section, the thickness of the individual annular body is small, and this, and the reduced weight on account of the reduced consumption of rib material, has the effect that additional annular bodies can find room upon the hollow , .j rotor without overloading the latter and without reduc~ing the available space for material to be dried too much.
At the same time, the advantage of having smooth surfaces in contact with the material to be dried, and the possi-bility of using stationary reamers as in the hereinbefore described known design, is retained.
lQ4Q419 In an embodiment of the drying apparatus according to the invention the individual ribs have been manufactured from plane sheets, and the helical hollow space has been formed by attachment to the sheet of Sp ;~ a lly a hclically cut strip of arcuate cross-section, possibly a strip made from a coiled tube being cut into halves along an axial plane. Besides, the space between indi-vidual turns of the coil can be reduced to a minimum by s,~;ral forming the strip used for making the h~lic~l hollow lo space from a sheet, in which only a single helical cut is made. The distance between the individual turns will then correspond to the reduction in width resulting from the curving of the strip plus the width oP the coil, and you get the largest possible area o~ the rib, which is in direct contact with the heating medium.
To increase the heat transmission, the above described embodiment may be changed so that the outer end of the helical hollow space according to the invention is con-nected with a radially extending return passage to the , :
~ 20 hollow space of the rotor through an opening in the plane `I rib sheet. In this way, the flow rate of the heat medium can be increased, resulting in a larger heat transmis-sion.
I The heat transmission can be further increased in another embodiment according to the invention, by a hc~
lical strip of curved cross-section being mounted on each side of the plane sheet from which the rib is made.
In the latter embodiment according to the invention Sp~ ral the outer ends of the hclical, hollow spaces can overlap one another and be mutually connected through an opening in the rib sheet.
,r~, ` i04~)419 The stiffness of the rib sheet, and the capacity of withstanding internal pressure can be increased in a further embodiment according to the invention, by embossing or calander-ing a helical bulb in the sheet, from which the rib is made, said bulb being covered by a spirall~ cut, and also embossed strip to form the spiral hollow space.
In cases, where no direct flow of the heating medium through the spiral hollow spaces is possible, and when the heat medium is a vapour which is condensed, a problem may arise in getting the condensate and possible air contained in the vapour returned to the hollow rotor in counter-current to the vapour flow.
In an embodiment of the drier according to the invention, this problem is solved by the provision in the helical hollow space of a more or less tight-fitting guide plate consisting of a corres-pondingly spiral strip terminating shortly before the closed outer end of the hollow space.
This strip is only tightly fastened in part to allow the condensate to pass between the strip and the inner side of the heating coil. The condensate will mainly be collected in the outer hollow space, where it is concurrent to the vapour. In this manner, the condensate and the air is more easily chased out of the heating coil. The direction of rotation is preferably chosen so that the condensate is screwed towards the shaft.
Instead of a strip, a tube may be used, which is inserted in the hollow space of the heating coil. By means of this tube, the heating medium may be led forward to the outer end of the heating spiral.
1~4~419 Finally, an embodiment of the dryer may advantageously be designed so that the distance between the turns of the spiral hollow space is adjusted so that helically cut strips can be used for forming the hollow spaces, said strips being substantially of a width corresponding to the distance between the turns of these spiral strips. Thus, a saving of material is gained, since two interlocking spiral strips may be cut from one and the same sheet.
Common to all of the above embodiments is that the construction work, consisting mainly in sheet cutting and welding, is well suited for automation owing to the long cuts and con-tinuous welding seams. Further, the design of the fins or ribs results in a good utilization of the construction material, allowing for use of a more costly material, e.g. rustproof steel.
Some embodiments of the drier according to the invention will be described more detailed in the following having reference to the accompanying drawings, in which:
Fig. 1 schematically shows a longitudinal section of the drier, Fig. 2 on a larger scale an elevation of a rib on the hollow rotor of the apparatus, said rotor being seen in cross-section, Fig. 3 a radial section through a rib, Fig. 4 a radial section through another embodiment of a rib, Fig. 5 an elevation of part of a rib as shown in Fig.
4, and Fig. 6 a section along the line A-A in Fig. 5.
~, i~40419 The drier schematically shown in Fig. 1 consists of a stationary drum 10, having a heating jacket 11 around its cylindrical part, an inlet 12 for the material to be dried, and an outlet 13, which is here placed at the bottom, but may also be placed some way up the side of the drum.
Within the drum 10 and coaxially with it is pivotally mounted a rotor 14 having hollow axle-necks 15 and 16.
Through the axle-neck 15 passes a supply pipe 17 for .
the heating medium, here supposed to be steam, and through the ,~ 10 axle-neck 16 a siphon pipe 18 is inserted for draining off condensate, respectively heating medium, if the latter does not condense.
The rotor 14 is fitted with ribs 19 having a smooth, : :' but not plane exterior.
. ~, .
The said ribs may be of the design shown in elevation in Fig. 2 and in cross-section in Fig. 3 as having a spiral duct 20 for the heating medium, said duct being connected at its inner end with the hollow space of the rotor 14 through a length of pipe 21.
Preferably, the duct 20 is of lenticular or spindle-shaped cross-section in the outer turns, see Fig. 3, whereas the turn adjacent the rotor is of substantially triangular cross-section with a generatrix for the rotor wall as base.
In this case, the rib 19 has been cut from a plane metal sheet, after which a substantially spiral bulb has been embossed or calendered into~the sheet, and the resulting depression :~ .
is covered wi~h a strip 22, which has been spirally cut out and embossed to an arcuate - 8 _ lQ4~419 cross-section, said strip being welded on to ~orm the duct As suggested by the broken line, the duct 20 may be longi-tudinally divided almost onto the closed end by means of a coiled strip 28 being part-welded alony one or both borders to the middle of the passage 20. As appears from Fig. 2, the strip 23 extends to contact with, and is possibly fixed onto the exterior of the rotor 14 behind the supply pipe 21 for the heating medium. Thus, the medium is forced lo to first flow on to the extreme end of the duct 20 through that part of the said duct being closer to the rotor.
It can then pass around the end of the partition formed by the strip 23 and return through the other part of the duct 20. Possibly formed condensate will thus be driven forward by the heating medium and more easily re-turns to the hollow space of the rotor, from where it can be removed through the siphon pipe 18. More important is, however, that possibly separated air is also carried along and does not become stationary to form air pockets inhibiting or stopping the heating medium from enteriny the duct 20 .
Condensate and air are returned to the rotor through a pipe 24. Just behind said pipe, a closed partition 25 is provided.
At the circumference of some or all of the ribs 1~, shovels 26 ( Fig. ~ may be mounted crosswise to aid in moving the material to be dried forward towards the outlet 13.
If the partition 23 is omitted, the rotation of the rotor should be in such direction that the closed end of the duct 20 iS in front so that the movement of the conden-- ~4C~419 sate back to the hollow space o~ the rotor is aided by the rotor movement.
This is not unconditionally necessary when the par-tition 23 is built into the duct 20, even i~ also in this case the movement o~ the condensate is aided.
~;l The supply pipe 21 projects some way into the hollow space of the rotor so that its inner end will always be above the condensate level in the rotor space, said level beiny controlled by the siphon pipe 18.
lo In the ernbodiment as shown in Figs. ~-6, each oP the .l ribs 19 consists oP a plane sheet to which has been weld-Sp ~ r a //y -1 ~ ed the helicill~f cut, and to an arcuate form embossed stri.p 22 to Porm the hclical duct 20. Adjacent the closed outer end oP the said duct, an opening 27 leads to a ra-; 15 dial passage 28 on the backside oP the rib 19, so that the , condensate may be returned through this passage to the in-terior o~ the rotor 14.
. ~ ~
':
~ ~ .
- lo -
An apparatus of the said kind will speciPically lo be use~ul in the drying o~` ~ishmeal, offal ~rom slaught-erhouses, mash ~rom breweries, and the like tacky ma-terial o~ animal or vegetable originO
Formerly, materials of the said kind were dried by means of direct fired air driers, but since the mate-SCnS; f;vC
~ ~ 15 rials are often heat sensi~le and in1ammable when dried, `:~
;~ driers of this kind have been abandoned in favour o~
¦ driers with indirect heating.
Thus, drum driers with longitudinal pipes have been used, wherein the drum and the pipes rotate to-~¦ 20 gether or, as according to the Norwegian Patent No.
.... ,;
, 62.174, the drums are stationary being fitted with also ~.1 stationary heating pipes coiled in planes perpendicular to the drum axis, and with rotating stirring members ~;~ mounted upon a central shaft, and moving between the 1 25 coils. In another embodiment according to the same Sp;~a //y patent, the heating pipes are hclically coiled and mount-¦ ed upon a rotating hollow shaft.
These apparatus types are not suited for drying of ~ ., ;. ~
~-` tacky materials, because their ef~ectivity is rapidly decreased owing to the material forming deposits on the ~' ,.
.
104~419 pipes, which are removed only with difficulty, and be-~c n ~ v c cause the materials, if heat ~en3iblc, will be damaged, unless the temperature of the heating medium is limited to values below the scorching temperature of the mate-rial in question. The deposits will also often be of poor heat conductivity.
In the Norwegian Patent No. 95.490, therefore, a dryer has been proposed, having a stationary drum en-closing a hollow rotor encircled by hollow annular bo-lo dies of triangular cross section, so that only smooth surfaces come into contact with the material to be dried.
Possible deposits on such smooth surfàces are relatively easily detached during the movement of the surfaces in the material to be dried, even as the possibility exists l 15 of providing stationary reamers.
;~ The said design has various disadvantages. Thus, I smooth surfaces as those of the said annular bodies are not very resistant to pressure, and because pressurized steam is yenerally used as a heating medium, the bodies have either to be made from heavy sheet material, which involves weight problems, or, as is usual in the appa-ratuses used in practise, stays have to be welded in between the two frustoconical sheets making up one such annular body. This welding of stays is dif~icult to me-~j 25 chanize and since as many as 90 stays are used in each ¦ body, this contrivance is very costly.
;l Further, the cross-sectionally triangular design of the annular bodies makes them bulky so that only a limit-ed number of bodies can find room on the hollow rotor, and the effective space for reception of the material to be dried is reduced.
~he object of the invention is to provide a dryer sub-s-tantially relieving the said disadvantayes, being con-structionally so designed that the manufacture thereof can be largely mechanized and automatically carried through.
With this object in view, the characteristic feature of the drier of the invention is that the annular bodies S~o;ra t A encircling the rotor are designed as ribs with a hclical hollow space, the inner end of which is in connection with the interior of the rotor, the outer end near the lo circumference of the rib being closed.
This design is based upon the recognition that the heat transmission number between heating surface and drying goods for the materials dealt with here is so low, 20 - 60 kcal/m2hC, that a fin or rib design as stated hereinbefore, where only part of the surface is directly heated, is effective. Owing to the small cross-sectional area of the heating coil and its confinement within curved surfaces, it will endure a relatively high pressure of the heating medium without any need for additional bracing.
Since the heating coil is preferably of lenticular cross-section, the thickness of the individual annular body is small, and this, and the reduced weight on account of the reduced consumption of rib material, has the effect that additional annular bodies can find room upon the hollow , .j rotor without overloading the latter and without reduc~ing the available space for material to be dried too much.
At the same time, the advantage of having smooth surfaces in contact with the material to be dried, and the possi-bility of using stationary reamers as in the hereinbefore described known design, is retained.
lQ4Q419 In an embodiment of the drying apparatus according to the invention the individual ribs have been manufactured from plane sheets, and the helical hollow space has been formed by attachment to the sheet of Sp ;~ a lly a hclically cut strip of arcuate cross-section, possibly a strip made from a coiled tube being cut into halves along an axial plane. Besides, the space between indi-vidual turns of the coil can be reduced to a minimum by s,~;ral forming the strip used for making the h~lic~l hollow lo space from a sheet, in which only a single helical cut is made. The distance between the individual turns will then correspond to the reduction in width resulting from the curving of the strip plus the width oP the coil, and you get the largest possible area o~ the rib, which is in direct contact with the heating medium.
To increase the heat transmission, the above described embodiment may be changed so that the outer end of the helical hollow space according to the invention is con-nected with a radially extending return passage to the , :
~ 20 hollow space of the rotor through an opening in the plane `I rib sheet. In this way, the flow rate of the heat medium can be increased, resulting in a larger heat transmis-sion.
I The heat transmission can be further increased in another embodiment according to the invention, by a hc~
lical strip of curved cross-section being mounted on each side of the plane sheet from which the rib is made.
In the latter embodiment according to the invention Sp~ ral the outer ends of the hclical, hollow spaces can overlap one another and be mutually connected through an opening in the rib sheet.
,r~, ` i04~)419 The stiffness of the rib sheet, and the capacity of withstanding internal pressure can be increased in a further embodiment according to the invention, by embossing or calander-ing a helical bulb in the sheet, from which the rib is made, said bulb being covered by a spirall~ cut, and also embossed strip to form the spiral hollow space.
In cases, where no direct flow of the heating medium through the spiral hollow spaces is possible, and when the heat medium is a vapour which is condensed, a problem may arise in getting the condensate and possible air contained in the vapour returned to the hollow rotor in counter-current to the vapour flow.
In an embodiment of the drier according to the invention, this problem is solved by the provision in the helical hollow space of a more or less tight-fitting guide plate consisting of a corres-pondingly spiral strip terminating shortly before the closed outer end of the hollow space.
This strip is only tightly fastened in part to allow the condensate to pass between the strip and the inner side of the heating coil. The condensate will mainly be collected in the outer hollow space, where it is concurrent to the vapour. In this manner, the condensate and the air is more easily chased out of the heating coil. The direction of rotation is preferably chosen so that the condensate is screwed towards the shaft.
Instead of a strip, a tube may be used, which is inserted in the hollow space of the heating coil. By means of this tube, the heating medium may be led forward to the outer end of the heating spiral.
1~4~419 Finally, an embodiment of the dryer may advantageously be designed so that the distance between the turns of the spiral hollow space is adjusted so that helically cut strips can be used for forming the hollow spaces, said strips being substantially of a width corresponding to the distance between the turns of these spiral strips. Thus, a saving of material is gained, since two interlocking spiral strips may be cut from one and the same sheet.
Common to all of the above embodiments is that the construction work, consisting mainly in sheet cutting and welding, is well suited for automation owing to the long cuts and con-tinuous welding seams. Further, the design of the fins or ribs results in a good utilization of the construction material, allowing for use of a more costly material, e.g. rustproof steel.
Some embodiments of the drier according to the invention will be described more detailed in the following having reference to the accompanying drawings, in which:
Fig. 1 schematically shows a longitudinal section of the drier, Fig. 2 on a larger scale an elevation of a rib on the hollow rotor of the apparatus, said rotor being seen in cross-section, Fig. 3 a radial section through a rib, Fig. 4 a radial section through another embodiment of a rib, Fig. 5 an elevation of part of a rib as shown in Fig.
4, and Fig. 6 a section along the line A-A in Fig. 5.
~, i~40419 The drier schematically shown in Fig. 1 consists of a stationary drum 10, having a heating jacket 11 around its cylindrical part, an inlet 12 for the material to be dried, and an outlet 13, which is here placed at the bottom, but may also be placed some way up the side of the drum.
Within the drum 10 and coaxially with it is pivotally mounted a rotor 14 having hollow axle-necks 15 and 16.
Through the axle-neck 15 passes a supply pipe 17 for .
the heating medium, here supposed to be steam, and through the ,~ 10 axle-neck 16 a siphon pipe 18 is inserted for draining off condensate, respectively heating medium, if the latter does not condense.
The rotor 14 is fitted with ribs 19 having a smooth, : :' but not plane exterior.
. ~, .
The said ribs may be of the design shown in elevation in Fig. 2 and in cross-section in Fig. 3 as having a spiral duct 20 for the heating medium, said duct being connected at its inner end with the hollow space of the rotor 14 through a length of pipe 21.
Preferably, the duct 20 is of lenticular or spindle-shaped cross-section in the outer turns, see Fig. 3, whereas the turn adjacent the rotor is of substantially triangular cross-section with a generatrix for the rotor wall as base.
In this case, the rib 19 has been cut from a plane metal sheet, after which a substantially spiral bulb has been embossed or calendered into~the sheet, and the resulting depression :~ .
is covered wi~h a strip 22, which has been spirally cut out and embossed to an arcuate - 8 _ lQ4~419 cross-section, said strip being welded on to ~orm the duct As suggested by the broken line, the duct 20 may be longi-tudinally divided almost onto the closed end by means of a coiled strip 28 being part-welded alony one or both borders to the middle of the passage 20. As appears from Fig. 2, the strip 23 extends to contact with, and is possibly fixed onto the exterior of the rotor 14 behind the supply pipe 21 for the heating medium. Thus, the medium is forced lo to first flow on to the extreme end of the duct 20 through that part of the said duct being closer to the rotor.
It can then pass around the end of the partition formed by the strip 23 and return through the other part of the duct 20. Possibly formed condensate will thus be driven forward by the heating medium and more easily re-turns to the hollow space of the rotor, from where it can be removed through the siphon pipe 18. More important is, however, that possibly separated air is also carried along and does not become stationary to form air pockets inhibiting or stopping the heating medium from enteriny the duct 20 .
Condensate and air are returned to the rotor through a pipe 24. Just behind said pipe, a closed partition 25 is provided.
At the circumference of some or all of the ribs 1~, shovels 26 ( Fig. ~ may be mounted crosswise to aid in moving the material to be dried forward towards the outlet 13.
If the partition 23 is omitted, the rotation of the rotor should be in such direction that the closed end of the duct 20 iS in front so that the movement of the conden-- ~4C~419 sate back to the hollow space o~ the rotor is aided by the rotor movement.
This is not unconditionally necessary when the par-tition 23 is built into the duct 20, even i~ also in this case the movement o~ the condensate is aided.
~;l The supply pipe 21 projects some way into the hollow space of the rotor so that its inner end will always be above the condensate level in the rotor space, said level beiny controlled by the siphon pipe 18.
lo In the ernbodiment as shown in Figs. ~-6, each oP the .l ribs 19 consists oP a plane sheet to which has been weld-Sp ~ r a //y -1 ~ ed the helicill~f cut, and to an arcuate form embossed stri.p 22 to Porm the hclical duct 20. Adjacent the closed outer end oP the said duct, an opening 27 leads to a ra-; 15 dial passage 28 on the backside oP the rib 19, so that the , condensate may be returned through this passage to the in-terior o~ the rotor 14.
. ~ ~
':
~ ~ .
- lo -
Claims (15)
1. A heat exchanger for treating moist, tacky material, which comprises a stationary drum having an internal hollow shaft or rotor with inlet and outlet for the heat exchanging medium, and a plurality of annular longitudinally spaced ribs encircling said rotor, each of said ribs having a spiral hollow space, the outer end of which is closed and means connecting the hollow inner end to the hollow space of the rotor.
2. An exchanger according to claim 1, in which the individual rib comprises a plane sheet, having attached thereto a spiral strip of arcuate cross-section forming the spiral hollow space.
3. An exchanger according to claim 2, in which the outer end of the spiral hollow space is connected with a radially extending return passage to the hollow space of the rotor through an opening in the plane rib sheet.
4. An exchanger according to claim 1, in which a spiral strip of curved cross-section mounted on each side of a plane sheet of the rib forms two helical hollow spaces in the rib.
5. An exchanger according to claim 4, in which the outer ends of the spiral hollow spaces overlap one another and are mutually connected through an opening in the rib sheet.
6. An exchanger according to claim 1, in which a spiral bulb embossed or calendered in a sheet of the rib and covered by a spiral embossed strip forms the spiral hollow space.
7. An exchanger according to claim 1, including a guide plate in the spiral hollow space of the rib, said guide plate terminating shortly before the closed end of said hollow space.
8. An exchanger according to claim 1, in which the distance between the turns of the spiral hollow space is such that spiral strips of a width substantially corresponding to the distance between the turns of said strips form the hollow space.
9. A heat exchanger for treating moist, tacky material, which comprises a stationary drum, having an internal hollow shaft or rotor with an inlet and outlet for the heat exchanging medium, a plurality of longitudinally spaced annular ribs encircling said rotor, each of said ribs being provided with a spiral, hollow space the outer end of which is closed, means connecting the inner end of the space with the hollow shaft, each said rib comprising a plane sheet having attached thereto a spiral strip of arcuate cross-section to form the spiral hollow space and means for rotating said hollow shaft and the shaft attached annular ribs in a direction such that the closed end of the spiral space is in front whereby movement of the condensate back to the hollow space of the rotor is aided by the rotor movement.
10. An exchanger according to claim 9, in which a spiral strip of curved cross-section is mounted on each side of the plane sheet to form two spiral hollow spaces in the rib.
11. An exchanger according to claim 10, in which the outer ends of the spiral hollow spaces overlap one another and are mutually connected through an opening in the rib sheet.
12. An exchanger according to claim 9, in which a spiral bulb embossed or calendered in the sheet covered by a spiral embossed strip forms the spiral hollow space.
13. A heat exchanger for treating moist, tacky material, which comprises a stationary drum, having an internal hollow shaft or rotor with an inlet and outlet for the heat exchanging medium, a plurality of longitudinally spaced annular ribs encircling said rotor, each of said ribs being provided with a spiral, hollow space, the outer end of which is closed, means connecting the inner end of the hollow space to the hollow shaft, means for rotating said hollow shaft and the shaft attached annular ribs, and a guide plate in the hollow space of the rib, said guide plate terminating shortly before the closed end of said hollow space.
14. A heat exchanger for treating moist, tacky material, which comprises a stationary drum, having an internal hollow shaft or rotor with an inlet and outlet for the heat exchanging medium, a plurality of longitudinally spaced annular ribs encircling said rotor, each of said ribs being provided with a spiral, hollow space, the outer end of which is closed, means connected the inner end of the hollow space with the hollow shaft, and means for rotating said hollow shaft and the shaft attached annular ribs, said annular ribs being further characterized in that the distance between the turns of the spiral hollow space is such so that spiral strips of a width substantially corresponding to the distance between the turns of said strips form the hollow space in a direction such that the closed end of the space is in front whereby movement of the condensate back to the hollow space of the rotor is aided by the rotor movement.
15. An exchanger according to claim 9, including a radially extending return passage, means connecting one end of said return passage to the outer end of the spiral hollow space and means connecting the other end to the hollow space of the rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA200,090A CA1040419A (en) | 1974-05-16 | 1974-05-16 | Drum and disc dryer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA200,090A CA1040419A (en) | 1974-05-16 | 1974-05-16 | Drum and disc dryer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1040419A true CA1040419A (en) | 1978-10-17 |
Family
ID=4100088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA200,090A Expired CA1040419A (en) | 1974-05-16 | 1974-05-16 | Drum and disc dryer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1040419A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012171067A1 (en) * | 2011-06-16 | 2012-12-20 | David Kenneth Pinches | Disc for industrial plants |
| US11718057B2 (en) | 2016-02-19 | 2023-08-08 | Regreen Technologies, Inc. | Apparatus for pressing and dehydrating of waste |
-
1974
- 1974-05-16 CA CA200,090A patent/CA1040419A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012171067A1 (en) * | 2011-06-16 | 2012-12-20 | David Kenneth Pinches | Disc for industrial plants |
| US9423180B2 (en) | 2011-06-16 | 2016-08-23 | David Kenneth Pinches | Disc for industrial plants |
| US11718057B2 (en) | 2016-02-19 | 2023-08-08 | Regreen Technologies, Inc. | Apparatus for pressing and dehydrating of waste |
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