CA1151416A - Drying oven for indefinite length material - Google Patents
Drying oven for indefinite length materialInfo
- Publication number
- CA1151416A CA1151416A CA000388214A CA388214A CA1151416A CA 1151416 A CA1151416 A CA 1151416A CA 000388214 A CA000388214 A CA 000388214A CA 388214 A CA388214 A CA 388214A CA 1151416 A CA1151416 A CA 1151416A
- Authority
- CA
- Canada
- Prior art keywords
- chamber
- gas
- passage
- passages
- inlet
- 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
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/001—Heating arrangements using waste heat
- F26B23/002—Heating arrangements using waste heat recovered from dryer exhaust gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Drying Of Solid Materials (AREA)
Abstract
DRYING OVEN FOR INDEFINITE LENGTH MATERIAL
Abstract of the Disclosure A drying oven for an indefinite length of material having a drying chamber surrounded by an annular heat exchanger, the drying chamber having an inlet and outlet for material passing through it.
The heat exchanger has heat exchange members defining flow passages extending axially and around the chamber and having an incoming passage interconnected with an outgoing passage by means of the drying chamber.
- i -
Abstract of the Disclosure A drying oven for an indefinite length of material having a drying chamber surrounded by an annular heat exchanger, the drying chamber having an inlet and outlet for material passing through it.
The heat exchanger has heat exchange members defining flow passages extending axially and around the chamber and having an incoming passage interconnected with an outgoing passage by means of the drying chamber.
- i -
Description
This invention relates to a drying oven for indefinite len~ths of material.
nr,yin~ ovens are well known for drying indeFinite lengths nf material after certain processing operations. The ovens may be necessary to dry coatinns or irnpreqnations of material which contain water or solvents. In order to dry these materials, dry air is passed through the ovens and through a heating zone in nrder to entrain evaporated materials and dispose of them outside the oven. In many cases, insulation has to be provided around the ovens in cases where 1n heat radiation could cause damage to other equipment or personnel and this insulation adds substantially to the oven si~e without assistin~
in an~y way in the efficiency of the drying procedure. For instance, in the dryinq of certain materials such as layers of material placed upon electrical coductors during manufacture of cable, any oven may be of relativel,y small cross-sectional area compared to the total area including the insulation required to provide a surface temperature of the oven which is within an acceptably low range.
It would be advantageous if the insulation normally provided for ovens of this type were to be replaced while still 2n effectively lowerin~ the temperature at the outside surface of the structure and assisting to increase the efficienc,y of the oven.
Accordingly, the present invention provides a dryirlq oven for an indefinite len~th of material com~rising a struc-ture defining a dryinq chamher havinq an inlet and an out'let fcr the inclefinite length passinq throuqh the oven, the chamber surrounded b!l an annular heat exchanqer comprisin~ a plurality of heat exchange members which between them define and separate flow passages extending axially of the chamber ~1~
~c~
and around the cilamher9 at leas-t one of the passages heing a passage for incolling qas to the chamber and another o-f -the passa~es being a passage for outgoin~ qas from the chamber, and each o-f the passages havin~ a qas -inlet and a ~as outlet to effect flow of gas along the passaqe, the outlet of a gas incoming passaqe and the inle-i of a gas outqoing passaqe interconnecting said passages with the chamber at axially spaced positions -to effect passage of qas along the charnber.
It is preferahle to have -the inlet and out1et of each passage spaced in the axial direction of the chamber to effect movement 1n of the qas alonq the passaqe in the axial directionO
In the above oven, as many gas incoming and gas outgoing passages rnay be provided as is desired. In a case where more than one passaqe is provided for incominq or outgoinq clas, then the incoming or outqoinq passages, as the case ma~y be, alternate outwardly through the exchanqer from one passaqe to another. ~lith such a structure, where more -than one incominq or outqoinq passage is provided9 then the incominq or outqoing passaqes, as the case may be, should re disposed in series with one passaqe havinq an outlet communicatinq with an inlet of another passaqe.
The invention is particularly applicable for use in tne manufacture of an insulated electrical conductor for the drying of adhesive coatinq qiven to the conductor hefore tht! application to the adhesive of a pulp insu'lation.
Accordinqly, the invention also inc'lu-les apparatus for providinq an indefinite lenqth of elec-trical conductor with pulp insulation comprising an adhesive applicator to apply adhesive to the electrical conductor, a Iryin~ oven downstream frorn the applicator, -the dryin~l oven comprisillq a structllre defininq a dryillg chamber havinq an inlet and an outlet for passaqe therethrough oF the conductor, the chamber surrollnded by an annular heat exchanger comprising a plurality of heat exchanqe merlters which hetween them define and separa-te flow passaqes extendinq axially of the charnber and around the chamber9 at least one of the passages bein~ d passage for incorning ~as to the chamher and another of -the passa~es being a passage for outgoing ~as from the chamber, and each of the passages havinq a gas inlet and a gas outlet to effect flow of gas alonq the passage, the outlet of a gas n incominq passage and the inlet of a qas outgoin~ passage interconnectinq the chamher with each passages at axially spaced positions to effect passa~e of gas along the chamber.
One embodiment of the invention will now be described, by way of exarlple, with reference to the accompanyin~ drawinqs in which:-Flqure 1 is a diaqrarnmatic view in side elevation ofapparatus for con-tinuously providing an electrical conductor with pulp insulation;
Figure 2 is a multi cross-sectional view in the same elevation as in Figure 1 throuqh an oven and heat exchanger assembly 2n forminq part of the apparatus in Fiqure 1 and on a 1arger scale, the multi cross-section showinq heat exchange passaqes through the exchanqer; and Fi~ure 3 is a cross-sectionlll view throll(lh the oven and heat exchanqer assemtlly of Fiqure 2 taken alon~ lines III-III in Fiqure 2.
As shown by Fiqure 1, in apparatus for nrovidinq an indefinite len~th of electrical conductor with a pulp insulation llS1416 covering layer, the conductor 10 is fed through an adhesive bath applicator 12 by passage around a roll 14 submerged in the applicator.
The adhesive coated conductor then passes vertically upwardly through d drying oven 16 and out from the top of the oven to be then passed downstream through a conventional pulp bath 18 before continuing through further dryinq stages. As shown by Figures 2 and 3, the drying oven 16 has an oven drying chamber 20 for passage therethrough of the conductor 10 from an inlet 22 at the bottom of the chamber to an outlet 24 at the top. The chamber is of rectangular section as shown in Figure 3 and houses vertically positioned infrared drying elements 26 which are disposed at intervals and in staggered relationship along the lenqth of the chamber. The infrared elements are quartz based emitter elements such as are available from Casso-Solar Corporation or from Elstein of West Germany.
The chamber 20 is defined by a rectangular structure 28 which Provides the inside surface of a heat exchanger 30 which surrounds the chamber 20 and extends axially of the chamber from end to end. The heat exchanger comprises a passage system for incoming air to the chamber and also a passage system for outgoing air from the chamher. The ingoing and outgoing passages of these two systems are symetrically positioned with regard to a horizontal center line through the exchanger as shown by Figure 2. Accordingly, the passages on one side of the center line only will be described with the understanding that the passages at the other side of the center line are identical in construction hut are of opposite hand to that which is described.
Figure 2 shows the series of passages as represented beneath the horizontal center line. As shown by Figure 2, the incoming ' . '.
.. ...
~151416 passages comprise an outer annular passage 32 which communicates with an inner incoming passage 34, the two passages being connected in series by connecting passaqeways 36 at the lower end of the heat exchanger. An inlet 38 for incoming air is provided at the top of the passage 32 for air, from outside the heat exchanger, and an outlet for the incoming air is disposed at the top of the passage 34. Hence, incoming air must travel down the passage 32 and upwardly to the passage 34 before entering the chamber 20.
The outgoing air is conveyed through an inlet 40 on the lower end of the chamber 20 and into an outgoing passage 42 which has its outlet at the upper end of the passage as shown in Figure 2. Thus the outgoing air must travel upwards along the passage 42 before leaving the heat exchanger.
In use of the oven and heat exchanger, while the adhesive coated electrical conductor is travelling upwardly through the chamber 20 to be dried by heat provided by the heaters 26, the air passes continuously through the series of passages at each side of the horizontal center line. For this purpose, fans 46 are provided at the inlets and outlets for the air as shown, for instance, in Figure 3. As shown by the arrows indicating the direction of the air, because the outlet for the incoming air from passage 34 is at the top of the passage 34 whereas the inlet 40 to passage 42 is at the base of the chamber, then the air from one to the other must travel downwardly through the chamber 20 to take with it heat and moisture from the chamber obtained from the infrared elements and from the adhesive. The air passing downwardly through passage 32 and upwardly through passage 34 is opposite in direction from the flow of the air down the chamber ~51416 20 and upwardly through the passage 42 whereby good heat exchange characteristics are obtainable through the walls of the passages.
The passa~es of the heat exchanger are defined by heat conductive plates which are preferably made from aluminum. It is found that with the use of this structure, the air entering the chamber 20 is preheated and dried to a degree to provide less humid incoming air than is possible using ambient air directly into the chamber. Because the incoming air is preheated, it assists the infrared heaters in drying the adhesive whereby less power is required to obtain the degree of drying which would otherwise be necessary. Hence the energy consumption of the oven is lowered while the thermal efficiency is increased by the use of the heat exchanger.
In the above structure, outlets for condensate may be provided at the base of the passage 42 to allow a run-off for the condensate.
'
nr,yin~ ovens are well known for drying indeFinite lengths nf material after certain processing operations. The ovens may be necessary to dry coatinns or irnpreqnations of material which contain water or solvents. In order to dry these materials, dry air is passed through the ovens and through a heating zone in nrder to entrain evaporated materials and dispose of them outside the oven. In many cases, insulation has to be provided around the ovens in cases where 1n heat radiation could cause damage to other equipment or personnel and this insulation adds substantially to the oven si~e without assistin~
in an~y way in the efficiency of the drying procedure. For instance, in the dryinq of certain materials such as layers of material placed upon electrical coductors during manufacture of cable, any oven may be of relativel,y small cross-sectional area compared to the total area including the insulation required to provide a surface temperature of the oven which is within an acceptably low range.
It would be advantageous if the insulation normally provided for ovens of this type were to be replaced while still 2n effectively lowerin~ the temperature at the outside surface of the structure and assisting to increase the efficienc,y of the oven.
Accordingly, the present invention provides a dryirlq oven for an indefinite len~th of material com~rising a struc-ture defining a dryinq chamher havinq an inlet and an out'let fcr the inclefinite length passinq throuqh the oven, the chamber surrounded b!l an annular heat exchanqer comprisin~ a plurality of heat exchange members which between them define and separate flow passages extending axially of the chamber ~1~
~c~
and around the cilamher9 at leas-t one of the passages heing a passage for incolling qas to the chamber and another o-f -the passa~es being a passage for outgoin~ qas from the chamber, and each o-f the passages havin~ a qas -inlet and a ~as outlet to effect flow of gas along the passaqe, the outlet of a gas incoming passaqe and the inle-i of a gas outqoing passaqe interconnecting said passages with the chamber at axially spaced positions -to effect passage of qas along the charnber.
It is preferahle to have -the inlet and out1et of each passage spaced in the axial direction of the chamber to effect movement 1n of the qas alonq the passaqe in the axial directionO
In the above oven, as many gas incoming and gas outgoing passages rnay be provided as is desired. In a case where more than one passaqe is provided for incominq or outgoinq clas, then the incoming or outqoinq passages, as the case ma~y be, alternate outwardly through the exchanqer from one passaqe to another. ~lith such a structure, where more -than one incominq or outqoinq passage is provided9 then the incominq or outqoing passaqes, as the case may be, should re disposed in series with one passaqe havinq an outlet communicatinq with an inlet of another passaqe.
The invention is particularly applicable for use in tne manufacture of an insulated electrical conductor for the drying of adhesive coatinq qiven to the conductor hefore tht! application to the adhesive of a pulp insu'lation.
Accordinqly, the invention also inc'lu-les apparatus for providinq an indefinite lenqth of elec-trical conductor with pulp insulation comprising an adhesive applicator to apply adhesive to the electrical conductor, a Iryin~ oven downstream frorn the applicator, -the dryin~l oven comprisillq a structllre defininq a dryillg chamber havinq an inlet and an outlet for passaqe therethrough oF the conductor, the chamber surrollnded by an annular heat exchanger comprising a plurality of heat exchanqe merlters which hetween them define and separa-te flow passaqes extendinq axially of the charnber and around the chamber9 at least one of the passages bein~ d passage for incorning ~as to the chamher and another of -the passa~es being a passage for outgoing ~as from the chamber, and each of the passages havinq a gas inlet and a gas outlet to effect flow of gas alonq the passage, the outlet of a gas n incominq passage and the inlet of a qas outgoin~ passage interconnectinq the chamher with each passages at axially spaced positions to effect passa~e of gas along the chamber.
One embodiment of the invention will now be described, by way of exarlple, with reference to the accompanyin~ drawinqs in which:-Flqure 1 is a diaqrarnmatic view in side elevation ofapparatus for con-tinuously providing an electrical conductor with pulp insulation;
Figure 2 is a multi cross-sectional view in the same elevation as in Figure 1 throuqh an oven and heat exchanger assembly 2n forminq part of the apparatus in Fiqure 1 and on a 1arger scale, the multi cross-section showinq heat exchange passaqes through the exchanqer; and Fi~ure 3 is a cross-sectionlll view throll(lh the oven and heat exchanqer assemtlly of Fiqure 2 taken alon~ lines III-III in Fiqure 2.
As shown by Fiqure 1, in apparatus for nrovidinq an indefinite len~th of electrical conductor with a pulp insulation llS1416 covering layer, the conductor 10 is fed through an adhesive bath applicator 12 by passage around a roll 14 submerged in the applicator.
The adhesive coated conductor then passes vertically upwardly through d drying oven 16 and out from the top of the oven to be then passed downstream through a conventional pulp bath 18 before continuing through further dryinq stages. As shown by Figures 2 and 3, the drying oven 16 has an oven drying chamber 20 for passage therethrough of the conductor 10 from an inlet 22 at the bottom of the chamber to an outlet 24 at the top. The chamber is of rectangular section as shown in Figure 3 and houses vertically positioned infrared drying elements 26 which are disposed at intervals and in staggered relationship along the lenqth of the chamber. The infrared elements are quartz based emitter elements such as are available from Casso-Solar Corporation or from Elstein of West Germany.
The chamber 20 is defined by a rectangular structure 28 which Provides the inside surface of a heat exchanger 30 which surrounds the chamber 20 and extends axially of the chamber from end to end. The heat exchanger comprises a passage system for incoming air to the chamber and also a passage system for outgoing air from the chamher. The ingoing and outgoing passages of these two systems are symetrically positioned with regard to a horizontal center line through the exchanger as shown by Figure 2. Accordingly, the passages on one side of the center line only will be described with the understanding that the passages at the other side of the center line are identical in construction hut are of opposite hand to that which is described.
Figure 2 shows the series of passages as represented beneath the horizontal center line. As shown by Figure 2, the incoming ' . '.
.. ...
~151416 passages comprise an outer annular passage 32 which communicates with an inner incoming passage 34, the two passages being connected in series by connecting passaqeways 36 at the lower end of the heat exchanger. An inlet 38 for incoming air is provided at the top of the passage 32 for air, from outside the heat exchanger, and an outlet for the incoming air is disposed at the top of the passage 34. Hence, incoming air must travel down the passage 32 and upwardly to the passage 34 before entering the chamber 20.
The outgoing air is conveyed through an inlet 40 on the lower end of the chamber 20 and into an outgoing passage 42 which has its outlet at the upper end of the passage as shown in Figure 2. Thus the outgoing air must travel upwards along the passage 42 before leaving the heat exchanger.
In use of the oven and heat exchanger, while the adhesive coated electrical conductor is travelling upwardly through the chamber 20 to be dried by heat provided by the heaters 26, the air passes continuously through the series of passages at each side of the horizontal center line. For this purpose, fans 46 are provided at the inlets and outlets for the air as shown, for instance, in Figure 3. As shown by the arrows indicating the direction of the air, because the outlet for the incoming air from passage 34 is at the top of the passage 34 whereas the inlet 40 to passage 42 is at the base of the chamber, then the air from one to the other must travel downwardly through the chamber 20 to take with it heat and moisture from the chamber obtained from the infrared elements and from the adhesive. The air passing downwardly through passage 32 and upwardly through passage 34 is opposite in direction from the flow of the air down the chamber ~51416 20 and upwardly through the passage 42 whereby good heat exchange characteristics are obtainable through the walls of the passages.
The passa~es of the heat exchanger are defined by heat conductive plates which are preferably made from aluminum. It is found that with the use of this structure, the air entering the chamber 20 is preheated and dried to a degree to provide less humid incoming air than is possible using ambient air directly into the chamber. Because the incoming air is preheated, it assists the infrared heaters in drying the adhesive whereby less power is required to obtain the degree of drying which would otherwise be necessary. Hence the energy consumption of the oven is lowered while the thermal efficiency is increased by the use of the heat exchanger.
In the above structure, outlets for condensate may be provided at the base of the passage 42 to allow a run-off for the condensate.
'
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A drying oven for an indefinite length of material comprising a structure defining a drying chamber having an inlet and an outlet for the indefinite length passing through the oven, heating means within the chamber to directly dry the material, the chamber surrounded by an annular heat exchanger comprising a plurality of heat exchange members which between them define and separate flow passages extending axially of the chamber and around the chamber, at least a first of the passages being a flow passage for incoming gas, having an inlet for said gas and having an outlet leading into the chamber at a first location, and a second of the passages being a flow passage for outgoing gas from the chamber, having a gas inlet leading from the chamber at a second location spaced from the first location to cause gas flow through said chamber to pass across said heating means, said second passage also having a gas outlet to effect flow of gas heated in the chamber outwardly from said chamber, the heat exchange members provided to cause heat transfer from outgoing gas in said second passage to incoming gas in the first passage.
2. An oven according to claim 1, wherein the inlet and outlet of each passage are spaced in the axial direction of the chamber.
3. An oven according to either claim 1 or claim 2, wherein a plurality of gas incoming passages are provided, the gas incoming passages being connected together and with the drying chamber in series and alternating outwardly through the exchanger with an outgoing passage or passages.
4. Apparatus for providing an indefinite length of electrical conductor with pulp insulation comprising an adhesive applicator to apply adhesive to the electrical conductor, a drying oven downstream from the applicator, the drying oven comprising a structure defining a drying chamber having an inlet and an outlet for passage therethrough of the conductor, heating means within the chamber to directly dry adhesive on the conductor as it passes through the oven, the chamber surrounded by an annular heat exchanger comprising a plurality of heat exchange members which between them define and separate flow passages extending axially of the chamber and around the chamber, at least a first of the passages being a flow passage for incoming gas, having an inlet for said gas and having an outlet leading into the chamber at a first location, and a second of the passages being a flow passage for outgoing gas from the chamber, having a gas inlet leading from the chamber at a second location spaced from the first location to cause gas flow through said chamber to pass across said heating means, said second passage also having a gas outlet to effect flow of gas heated in the chamber outwardly from said chamber, the heat exchange members provided to cause heat transfer from outgoing gas in said second passage to incoming gas in the first passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000388214A CA1151416A (en) | 1981-10-19 | 1981-10-19 | Drying oven for indefinite length material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000388214A CA1151416A (en) | 1981-10-19 | 1981-10-19 | Drying oven for indefinite length material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1151416A true CA1151416A (en) | 1983-08-09 |
Family
ID=4121199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000388214A Expired CA1151416A (en) | 1981-10-19 | 1981-10-19 | Drying oven for indefinite length material |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1151416A (en) |
-
1981
- 1981-10-19 CA CA000388214A patent/CA1151416A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |