CA1141949A - Method and means for drying - Google Patents
Method and means for dryingInfo
- Publication number
- CA1141949A CA1141949A CA000352796A CA352796A CA1141949A CA 1141949 A CA1141949 A CA 1141949A CA 000352796 A CA000352796 A CA 000352796A CA 352796 A CA352796 A CA 352796A CA 1141949 A CA1141949 A CA 1141949A
- Authority
- CA
- Canada
- Prior art keywords
- drying
- temperature
- air
- blowing
- medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
Abstract
ABSTRACT
A method of drying a surface while blowing a gaseous medium on to the surface comprising blowing on to the surface compressed air, the relative humidity of which is essentially lower than that of the natural air layer immediately adjacent the surface, and heating the drying medium or parts thereof to such an elevated temperature that the surface is permitted to quickly attain a temperature above the dew point but below the temperature at which the surface is adversely affected.
A method of drying a surface while blowing a gaseous medium on to the surface comprising blowing on to the surface compressed air, the relative humidity of which is essentially lower than that of the natural air layer immediately adjacent the surface, and heating the drying medium or parts thereof to such an elevated temperature that the surface is permitted to quickly attain a temperature above the dew point but below the temperature at which the surface is adversely affected.
Description
SPECIFICATION
TO ALL WHOM IT MAY CONCERNo Be it known that I, Rolf Viktor Cederstrom, a subject of the King of Sweden, and resident of the city of Stockholm, Sweden, have invented certain new and useful improvmements in "METHOD AND MEANS FOR Dl~YING"
and I do hereby declare that the following is a full, clear and exact description of the same, reference being had to the accompanying sheets of drawing and to the numerals of reference 0 marked thereon, which form a part of this specification.
BACKGROUND OF THE INVENTION
Field of the Invention:
This invention relates to method and means for drying, and more precisely method and means of the class which operates with combustion of gas and which are adapted for removal of moisture from the surface of objects.
Prior art:
Previously known drying apparatuses which operate with combustion of gas may, simply stated, be said to constitute gas burners for heating of the surface, which should be dried, to such a temperature that water or moisture on the surface is removed essentially by vaporization and evaporation due to the rize of the surface temperature. However, it should be noted that a comparatively large amount of heat energy is required to heat the surface to such an extent that evaporation takes place Further, it should be noted that by the combustion of gas, such as bottled gas, there are also generated large quantities of water steam, viz. of the order of about 2 cubic meters water steam per kilogram ~ \
of gas. In one way or another also that water steam must be removed to reach an effective drying. Therefore, the efficiency of the known drying apparatuses is normally very low.
SUMMARY OF THE INVENTION
The method of drying a surface while blowing a gaseous medium on to the surface according to the present invention comprises blowing on to the surface in question a gaseous pressurized drying medium, preferably compressed air, the relative humidity of which is essentially lower than that of the natural air layer immediately adjacent the surface, which shall be dried, and heating the drying medium or parts thereof to such an elevated temperature that the surface is permitted to ~uickly attain a temperature above the dew point, preferably above about 70 C but below the temperature at which the surface in question is adversely affected.
For a fuller understanding of the invention, reference may be had to the following description o~ preferred embodiments illustrated on the accompanying drawing.
ON THF DR~WING
FIG. 1 shows an axial longitudinal section through a somewhat gun-shaped drying apparatus according ~o the invention;
FIG. 2 shows an axial longitudinal section through a lance-shaped drying apparatus according to the invention;
FIG. 3 shows an axial longitudinal section through the front portion of a drying apparatus according to the invention having a slightly modified gas combustion means.
AS SHOWN ON THE DRAWING
The drying apparatus in FIG. 1 comprises a hollow casing 10 which serves as a handle and has a closed end 11 wherein compressed air is admitted through an air hose 12 with an air valve 13. In its other, foremost end the casing is provided with an air nozzle 13A which may be designed in such a manner that a conical air stream is rormed. Alternatively, the nozzle may be designed in such a manner that a comparatively thin and flat air stream is formed.
At its foremost end the hollow casing 10 is surrounded by a ring hood 14 wherein a ring burner 15 for gas is disposed.
The burner 15 is fed with gas from a channel 16 which extends through the casing 10 and is provided with a gas valve 17.
The valves 13 and 17 may be built together so that they are manipulated simultaneously, and it is possible to design the apparatus in such a manner, that a small pilot flame Is always 15 kept burning~ It would also be possible to design the valves in such a manner that they operate in accordance wi~h the principles of a so called "dead man's grip".
As shown the ring hood 14 is entirely open rearwardly and it is designed in such a manner that an air slot 18 is formed ~0 between the same and the outer surface of the casing 10.
Although not shown in the drawing it would also be possible to design the ring hood 14 in such a manner that the air flow area thereof may be controlled, and also in such a manner that the hood is axially adjustable in relation to both the nozzle 13A and the ring burner 15 which latter, of course, may also be axially adjustable in relation to the nozzle 13A.
The embodiment of FIG. 2 differs from the one of FIG. 1 only in that the hollow casing 10 of FIG~ 2 is designed as an elongated tubular lance.
The embodiment of FIG. 3 differs from the one of FIG. 2 essentially in that the air nozzle 13B is slightly extended forwardly and in that the gas burner opening are disposed more closely to the air nozzle.
Within the scope of the inventive idea the apparatus accord-ing to the invention may be completed by suitable means for surfaceooating or the like of the surface which is being dried.
Such means may take the shape of spraynozzles for paint or the li~e, arranged adjacent the air nozzle 13A or 13B, or within or round about the same.
The apparatus according to the invention operates in the followi~g manner:
In operation compressed air of a rather high pressure, such as of a pressure of 5 - 7 atmospheres super pressure and with a flow of about 0,5 cubic meters/min,. is fed to the nozzle 13A
and is blown in the shape of a cone or a flat stream against the surface which is to be dried.
By ejector effect also some air is also sucked in from behind through the slot inside the hood. The compressed air and the ambient air which has been sucked in is heated by means of the gas burner 15. Thereby there is formed a cone or flow of hot air which ensures a quick pick up of moisture from the surface which is being dried. The air of the air cone from the nozzlè results in that the very humid air is quickly moved away sidewardly, and at the same time it is ensured that no overheating occurs. Thus, it has proven possible to take upp moisture from wet paper without lighting the paper or even damaging the same by miscoloring.
The drying technique according to the invention makes use of the circumstance that moisture movements inwardly of a mater-ial may be reducea or even preventea if the heat transport within the material may be reduced and/or the speed of evaporation may be increased. Thus, if it is possible to prevent that the moisture before the evaporation first goes the way inwardly of the material and then returns back to the surface is it possible,to increase the drying effect materially. Moreover, this may take place at a smaller consumption of energy than with normal methods. As it is moreover possible so to say to "suck" up the water from the surface the drying effect may be still further increased.
In other words, the technioal solution may be said to involve ~lowing over a surface hot air at a high velocity and a relative humidity which is materially below that of the natural air layer immediately adjacent the surface which is being dried.
This results in .. a "suction effect" which increases the speed of evaporation due to the difference in relative humidity;
.. increased evaporation due to high air velocity along the surface;
.. reduced heat transport into the material because of the rapid evaporation (and the possibility to work at lower temperatures than bv the normal techniques);
.. possibility to control the surface temperature to the proper value with respect to type of material, the medium which isto be evaporated, the drying speed etc;
.. the drying operation may be carried out practically entirely independent of environmental conditions~
~'
TO ALL WHOM IT MAY CONCERNo Be it known that I, Rolf Viktor Cederstrom, a subject of the King of Sweden, and resident of the city of Stockholm, Sweden, have invented certain new and useful improvmements in "METHOD AND MEANS FOR Dl~YING"
and I do hereby declare that the following is a full, clear and exact description of the same, reference being had to the accompanying sheets of drawing and to the numerals of reference 0 marked thereon, which form a part of this specification.
BACKGROUND OF THE INVENTION
Field of the Invention:
This invention relates to method and means for drying, and more precisely method and means of the class which operates with combustion of gas and which are adapted for removal of moisture from the surface of objects.
Prior art:
Previously known drying apparatuses which operate with combustion of gas may, simply stated, be said to constitute gas burners for heating of the surface, which should be dried, to such a temperature that water or moisture on the surface is removed essentially by vaporization and evaporation due to the rize of the surface temperature. However, it should be noted that a comparatively large amount of heat energy is required to heat the surface to such an extent that evaporation takes place Further, it should be noted that by the combustion of gas, such as bottled gas, there are also generated large quantities of water steam, viz. of the order of about 2 cubic meters water steam per kilogram ~ \
of gas. In one way or another also that water steam must be removed to reach an effective drying. Therefore, the efficiency of the known drying apparatuses is normally very low.
SUMMARY OF THE INVENTION
The method of drying a surface while blowing a gaseous medium on to the surface according to the present invention comprises blowing on to the surface in question a gaseous pressurized drying medium, preferably compressed air, the relative humidity of which is essentially lower than that of the natural air layer immediately adjacent the surface, which shall be dried, and heating the drying medium or parts thereof to such an elevated temperature that the surface is permitted to ~uickly attain a temperature above the dew point, preferably above about 70 C but below the temperature at which the surface in question is adversely affected.
For a fuller understanding of the invention, reference may be had to the following description o~ preferred embodiments illustrated on the accompanying drawing.
ON THF DR~WING
FIG. 1 shows an axial longitudinal section through a somewhat gun-shaped drying apparatus according ~o the invention;
FIG. 2 shows an axial longitudinal section through a lance-shaped drying apparatus according to the invention;
FIG. 3 shows an axial longitudinal section through the front portion of a drying apparatus according to the invention having a slightly modified gas combustion means.
AS SHOWN ON THE DRAWING
The drying apparatus in FIG. 1 comprises a hollow casing 10 which serves as a handle and has a closed end 11 wherein compressed air is admitted through an air hose 12 with an air valve 13. In its other, foremost end the casing is provided with an air nozzle 13A which may be designed in such a manner that a conical air stream is rormed. Alternatively, the nozzle may be designed in such a manner that a comparatively thin and flat air stream is formed.
At its foremost end the hollow casing 10 is surrounded by a ring hood 14 wherein a ring burner 15 for gas is disposed.
The burner 15 is fed with gas from a channel 16 which extends through the casing 10 and is provided with a gas valve 17.
The valves 13 and 17 may be built together so that they are manipulated simultaneously, and it is possible to design the apparatus in such a manner, that a small pilot flame Is always 15 kept burning~ It would also be possible to design the valves in such a manner that they operate in accordance wi~h the principles of a so called "dead man's grip".
As shown the ring hood 14 is entirely open rearwardly and it is designed in such a manner that an air slot 18 is formed ~0 between the same and the outer surface of the casing 10.
Although not shown in the drawing it would also be possible to design the ring hood 14 in such a manner that the air flow area thereof may be controlled, and also in such a manner that the hood is axially adjustable in relation to both the nozzle 13A and the ring burner 15 which latter, of course, may also be axially adjustable in relation to the nozzle 13A.
The embodiment of FIG. 2 differs from the one of FIG. 1 only in that the hollow casing 10 of FIG~ 2 is designed as an elongated tubular lance.
The embodiment of FIG. 3 differs from the one of FIG. 2 essentially in that the air nozzle 13B is slightly extended forwardly and in that the gas burner opening are disposed more closely to the air nozzle.
Within the scope of the inventive idea the apparatus accord-ing to the invention may be completed by suitable means for surfaceooating or the like of the surface which is being dried.
Such means may take the shape of spraynozzles for paint or the li~e, arranged adjacent the air nozzle 13A or 13B, or within or round about the same.
The apparatus according to the invention operates in the followi~g manner:
In operation compressed air of a rather high pressure, such as of a pressure of 5 - 7 atmospheres super pressure and with a flow of about 0,5 cubic meters/min,. is fed to the nozzle 13A
and is blown in the shape of a cone or a flat stream against the surface which is to be dried.
By ejector effect also some air is also sucked in from behind through the slot inside the hood. The compressed air and the ambient air which has been sucked in is heated by means of the gas burner 15. Thereby there is formed a cone or flow of hot air which ensures a quick pick up of moisture from the surface which is being dried. The air of the air cone from the nozzlè results in that the very humid air is quickly moved away sidewardly, and at the same time it is ensured that no overheating occurs. Thus, it has proven possible to take upp moisture from wet paper without lighting the paper or even damaging the same by miscoloring.
The drying technique according to the invention makes use of the circumstance that moisture movements inwardly of a mater-ial may be reducea or even preventea if the heat transport within the material may be reduced and/or the speed of evaporation may be increased. Thus, if it is possible to prevent that the moisture before the evaporation first goes the way inwardly of the material and then returns back to the surface is it possible,to increase the drying effect materially. Moreover, this may take place at a smaller consumption of energy than with normal methods. As it is moreover possible so to say to "suck" up the water from the surface the drying effect may be still further increased.
In other words, the technioal solution may be said to involve ~lowing over a surface hot air at a high velocity and a relative humidity which is materially below that of the natural air layer immediately adjacent the surface which is being dried.
This results in .. a "suction effect" which increases the speed of evaporation due to the difference in relative humidity;
.. increased evaporation due to high air velocity along the surface;
.. reduced heat transport into the material because of the rapid evaporation (and the possibility to work at lower temperatures than bv the normal techniques);
.. possibility to control the surface temperature to the proper value with respect to type of material, the medium which isto be evaporated, the drying speed etc;
.. the drying operation may be carried out practically entirely independent of environmental conditions~
~'
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of drying a surface while blowing a gaseous medium onto the surface comprising blowing onto the surface in question a gaseous pressurized drying medium, preferably compressed air, the relative humidity of which is essentially lower than that of the natural air layer immediately adjacent the surface, which shall be dried, and heating the drying medium or parts thereof to such an elevated temperature that the surface is permitted to quickly attain a temperature above the dew point preferably above about 70°C but below the temperature at which the surface in question is adversely affected.
2. A method as claimed in claim 1, wherein the drying medium or parts thereof is given an elevated temperature by combustion of gas adjacent the flow of drying medium.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7908086-7 | 1979-09-28 | ||
| SE7908086A SE441300B (en) | 1979-09-28 | 1979-09-28 | Method and device for drying |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1141949A true CA1141949A (en) | 1983-03-01 |
Family
ID=20338926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000352796A Expired CA1141949A (en) | 1979-09-28 | 1980-05-27 | Method and means for drying |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1141949A (en) |
| SE (1) | SE441300B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE68925479D1 (en) * | 1988-10-25 | 1996-02-29 | Rolf V Cederstrom | Apparatus for drying a surface |
-
1979
- 1979-09-28 SE SE7908086A patent/SE441300B/en not_active IP Right Cessation
-
1980
- 1980-05-27 CA CA000352796A patent/CA1141949A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| SE7908086L (en) | 1981-03-29 |
| SE441300B (en) | 1985-09-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |