EP1532314A1 - Air dryer - Google Patents

Air dryer

Info

Publication number
EP1532314A1
EP1532314A1 EP03735742A EP03735742A EP1532314A1 EP 1532314 A1 EP1532314 A1 EP 1532314A1 EP 03735742 A EP03735742 A EP 03735742A EP 03735742 A EP03735742 A EP 03735742A EP 1532314 A1 EP1532314 A1 EP 1532314A1
Authority
EP
European Patent Office
Prior art keywords
air
paper web
nozzle box
web
exhaust
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03735742A
Other languages
German (de)
French (fr)
Other versions
EP1532314B1 (en
Inventor
Pertti Heikkilä
Pasi Rajala
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1532314A1 publication Critical patent/EP1532314A1/en
Application granted granted Critical
Publication of EP1532314B1 publication Critical patent/EP1532314B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air

Definitions

  • the object of the invention is an air dryer in the dryer section of a paper machine, which air dryer comprises at least one exhaust air chamber arranged on a first side of the paper web, and at least one nozzle box arranged inside said exhaust air chamber, into which nozzle box one or more blowing elements have been arranged in order to blow hot air to the paper web, in which exhaust air chamber at least one air exhaust element has been arranged, and in the central area between the forward end and the tail end of said air dryer, in the machine direction, the paper web has been arranged to travel without support elements arranged on a second side of the web.
  • a further object of the invention is a method in drying a paper web, in which method drying gas is blown towards the paper web with the aid of one or more blowing elements arranged into at least one nozzle box arranged inside at least one exhaust air chamber, the paper web being arranged to travel without support elements arranged on the second side of the web, the drying gas being in contact with the paper web, humidity present in the paper web passes into the drying gas, whereby the drying gas transforms into return air, and return air is exhausted via at least one air exhaust element arranged into at least one exhaust air chamber.
  • In paper making it is known to use different kinds of dryers for drying a paper web, and also especially coatings of coated paper.
  • Infra dryers and flotation dryers are efficient and largely used means, which both have their own advantages and disadvantages.
  • At certain points of a coating machine it is necessary to leave the other side of the web open, usually the lower side, because in that way it is easier to act after web breaks. Also the risk of a fire is then smaller.
  • the general opinion is that the coating is usually wanted to be heated into a sufficiently high temperature and only after that the evaporation is started.
  • the US patent publication 4,292,745 presents a double-sided flotation dryer in which the paper web travels between two nozzle series in which the location of the nozzles can be changed. In this solution the paper web is thus supported by the air jets coming from the nozzles.
  • An object of the invention is to achieve an air dryer with which the efficiency of the drying can be improved.
  • a special object of the invention is to present an air dryer that can be operated also with thin paper grades and, furthermore, in cases where a so called loose web escapes away in the area of the air dryer.
  • An object of the invention is an air dryer according to the independent claim 1 as well as the method for drying a paper web according to the independent claim 11.
  • An object of the invention is an air dryer in the dryer section of a paper machine, which dryer comprises at least one exhaust air chamber arranged on a first side of the paper web and at least one nozzle box arranged inside said exhaust air chamber, into which nozzle box one or more blowing elements have been arranged in order to blow hot air to the paper web, into which exhaust air chamber at least one air exhaust element has been arranged, and in the central area between the forward end and the tail end of said air dryer, in the machine direction, the paper web has been arranged to travel without support elements arranged on a second side of the web.
  • An air dryer according to the invention is characterized by the fact that the location of said nozzle box and/or said one or more blowing elements with regard to the paper web has been arranged so as to be changeable with the aid of an adjusting element.
  • an air dryer according to the invention By the means of an air dryer according to the invention, it is thus possible to improve the efficiency of the drying, as the dryer can be brought nearer to the web.
  • an air dryer according to the invention can be used also with thin paper grades and in cases where the so called loose web escapes away in the area of the air dryer, because the location of the nozzle box and/or blowing elements with respect to the paper web can be adjusted.
  • the air dryer according to the invention has been arranged on one side of the paper web, only.
  • support elements it is meant e.g. rolls or air jets.
  • the nozzle box and/or said one or more blowing elements can also be called by a common name blow surface.
  • the air dryer solution according to the invention can also be used for cooling the paper web, whereby the heated blow air is replaced with cooled blow air.
  • overpressure nozzles which direct to the web a force pushing away from the nozzle.
  • the expulsive force of the overpressure nozzles has to be suitable for the purpose.
  • the expulsive force depends on the distance between the nozzle and the web, so that when the distance is smaller, the expulsive force is stronger.
  • the underpressure of the exhaust air chamber can be affected with the aid of the amount of the exhaust air, and the underpressure tends to pull the web towards the dryer. Moving the dryer closer to the web and even over the web line, as well as making the dryer more curved, increases the force caused by the web tension with which the web stabilizes towards the dryer. The increase of the web tension boosts this force component.
  • the location of the nozzle box and/or one or more blowing elements with respect to the paper web is arranged so as to be changeable during the paper machine run.
  • the adjustment can be arranged to be manual or automatic, for example so that suitable detecting elements measure the paper web's line of travel, and thus guide the location of the nozzle box and/or the blowing element or elements.
  • the distance of the nozzle box and/or one or more blowing elements from the paper web has been arranged so as to be changeable between 0,1 and 120 mm. So, if the distance of the blow box from the paper web can be adjusted at least by several millimeters, preferably a few tens of millimeters, the adjustment range is for the most cases quite sufficient for the distance of the paper web and the blow surface of the air dryer to be suitable. It is clear that the distance can be arranged so as to adjustable e.g. by distances of 1-15 mm, 5-25 mm, 5-100 mm, 25-120 mm, 25-75 mm, or something else.
  • the nozzle box and/or one or more blowing elements have been arranged so as to be adjustable over the theoretical paper web line.
  • the nozzle surfaces of the nozzle box can be adjusted so as to exceed the theoretical web line, i.e. to force the paper web to curve. Then even a loose web is made stabile.
  • a dryer according to the invention can be arranged also so that the blowing elements are arranged so as to be adjustable also in the cross direction of the web.
  • said one or more blowing elements can be arranged into the nozzle box in a fixed or a mobile manner, i.e. the above- mentioned adjustment can be performed either by adjusting the entire nozzle box, or by adjusting only the blowing element arranged in it in a mobile manner.
  • the declination of the nozzle box and/or one or more blowing elements can be arranged so as to be adjustable in the machine direction.
  • the form of the lower part of the air dryer can be made to match even better the curved form of the paper web.
  • adjusting devices are needed respectively for suitably directing the nozzle box or blowing elements.
  • said air exhaust element is an exhaust air gap.
  • the air exhaust element can also be some other solution known as such to a person skilled in the art, such as an exhaust air duct or a combination of exhaust air ducts.
  • the air dryer has three nozzle boxes and four exhaust air gaps.
  • a very versatile dryer is achieved which is adjustable e.g. so that the outermost nozzle boxes are located higher than the middlemost, i.e. the nozzle boxes and the exhaust air gaps can be placed in a curved form, as often the paper web takes up a curved form, also.
  • the efficiency of the air dryer is approximately the highest possible thanks to the suitably small interspace.
  • the curved form is also more advantageous in view of the stability of the web.
  • the nozzle box is at least somehow insulated in order to prevent the blow air from cooling, whereby savings in energy are achieved, as the energy used for heating can more easily be directed to the object itself.
  • any blow air temperature and velocity suitable for the process can be used.
  • the temperature of the blow air is in the rage of 300-700°C, and the blow velocity is 40-60 m/s, the air dryer can be built rather small in size thanks to the high temperature of the drying air. As the blow velocity is rather low, the amount of circulating air and the size of the air devices remain also small.
  • the air dryer has been arranged so as to be asymmetric, so that a greater part of the return air is exhausted from the outlet side than from the inlet side of the paper web.
  • the return flows can be better controlled as the paper web itself tends to move blow air along it.
  • the amount of the air to be blown is advantageously essentially the same as the amount of the air to be exhausted.
  • the paper web can be controlled so that the paper web remains approximately in the same position, and the nozzle box and/or the blowing elements can be arranged to a suitable point by a suitable adjusting device in order to achieve a high drying efficiency. It is also possible to change the ratio of the amounts of the air to be blown and the air to be exhausted, even by over 15 %, as even in this way the stability of the paper web can be improved.
  • An object of the invention is also a method in drying a paper web, in which method - drying gas is blown towards the paper web with the aid of one or more blowing elements arranged in at least one nozzle box arranged inside at least one exhaust air chamber, which paper web has been arranged to travel without support elements arranged on a second side of the web,
  • the return air is exhausted via at least one air exhaust element arranged into at least one exhaust air chamber
  • the method according to the invention is characterized by the fact, that in order to boost the drying, the location of said at least one nozzle box and/or said one or more blowing elements is changed with respect to the paper web.
  • the location of said nozzle box and/or said one or more blowing elements with respect to the paper web is changed during the paper machine run.
  • Fig. 1 presents schematically as a cross section view an air dryer according to the first embodiment of the invention
  • Fig. 2 presents schematically as a cross section view a solution according to the second embodiment of the invention
  • Fig. 3 presents schematically as a cross section view an air dryer according to the third embodiment of the invention.
  • Fig. 4 presents schematically as a cross section view an air dryer according to the fourth embodiment of the invention.
  • Fig. 5 presents schematically as a perspective view an air dryer according to Fig 4.
  • the reference numeral 1 is used for indicating an air dryer according to the invention, which air dryer can present any of the embodiments of the invention.
  • the reference numeral 1 is used for indicating, as a cross section view, an air dryer according to the first embodiment of the invention and equipped with only one blow box.
  • the reference numeral 2 presents the paper web with an arrow indicating the direction of run.
  • the air blowable to the paper web 2 is brought via a channel (not shown) into the inner space 3 of the nozzle box 4 that is thermally insulated to some extent.
  • the nozzle box 4 is in the inner space 5 of the exhaust air chamber 6, and inside the nozzle box 4 there is a venting plate 7.
  • a blowing element 26 which is a structure from where hot air is blown towards the web through blow openings, which in here are holes.
  • Blowing of hot air towards the web has been indicated with reference numerals 8a - 8h.
  • the blowing element can be e.g. an air distribution element or a structure from which hot air is blown towards the web through blow openings, which usually are holes, even though also blow slots in right angle, seen in the machine direction, are used.
  • air exhaust element Before blowing to the web, outflow takes place in the machine direction through an air exhaust element, in this case through an exhaust air gap 9a in the direction of arrows 10a and 10b, and in the machine direction after blowing to the paper web, through an exhaust air gap 9b in the direction of arrows 10c and lOd.
  • the nozzle box 4 is movable by an up and down mechanism at least about 5 cm or at the most about 10 cm. It has to be noted, that the paper web can be of a width of several meters, even 10 m, so, already in the designing stage, the stiffness of the devices needs to be drawn up so as to be sufficiently high. At the location of the device, on the second side of the paper web, no roll is used.
  • Fig. 2 presents a solution according to the second embodiment of the invention, in which two air dryers 1 according to the first embodiment of the invention are used in succession for drying the paper web in the space between the rolls 12 and 13.
  • Fig. 3 presents an air dryer according to the third embodiment of the invention, in which the blowing elements are the nozzle boxes 15a - 15e. Furthermore, the exhaust air gaps 16a - 16f are inside the same exhaust air chamber 14. In this solution, it is also possible to adjust the distance of the nozzle boxes 15a - 15e and the exhaust air gaps 16a - 16f from the paper web during the machine run by a mechanism which is not presented here as it is known as such from other purposes of use. Many kinds of applications are offered as a solution, e.g. the use of a stepping motor, eccentric constructions, pressure medium solutions, etc. It is, however, important to choose a solution that will last the hot circumstances present in this kind of air dryers during the use.
  • Fig. 4 presents an air dryer according to the fourth embodiment of the invention, in which there are sequentially, in the machine direction, three box-like nozzle boxes 17a, 17b and 17c of which at least the utmost can be adjusted with regard to their location.
  • the reference numerals 18a and 18b indicate the axis points depending on which the nozzle boxes 17a and 17c, respectively, are supported from one of their edges. The other edges are adjustable in height during the machine run and they can be locked at a desired height.
  • the reference numeral 19a and 19b respectively, indicate adjusting elements, slots, tensioning devices, and the like, with which the nozzle boxes 17a and 17c can be transferred during the run at a desired location in order to obtain an optimal drying performance.
  • the installation of three nozzle boxes 17a - 17c in the air dryer naturally also requires an installation of air channels in the structure.
  • the hot blow air is brought via the duct 20 into the air dryer and via branches 21a and, respectively, 21b to the nozzle boxes 17a and 17c located at the edges.
  • bellows 22a and 22b are used for to allow the changes of location.
  • the paper web has the form of a large curve under the air dryer, it is necessary to place the nozzle box 17a, which is first in the machine direction, with its inlet side higher than its outlet side and, respectively, the last nozzle box 17c in reverse order with regard to the nozzle box 17a.
  • a combination in the form of an approximately large curve is obtained from the lower parts of the nozzle boxes 17a - 17c, whereby the paper web is at every point at an approximately same and rather short distance from the air dryer.
  • This arrangement also provides for a stabile web run.
  • Fig. 5 presents an air dryer of Fig. 4 as a perspective view.
  • the structure of the nozzle box 17a is presented more in detail.
  • the adjusting elements 19a and the axis point 18a are to be seen near to the edges of the nozzle box 17a.
  • the reference numerals 24, 25a and 25b present the blow surface.
  • the blowing elements can be arranged into different parts of the blow surface, e.g. into parts 25a and 25b, and possibly into part 24.
  • Exhaust air gaps 16a and 16b are arranged on both sides of the blow surface.
  • the amount of the inlet air is approximately the same as the amount of the exhaust air, even though by varying the ratio of the amounts of air (even over 15 %) the stability of the web can be improved.
  • the inlet of air to the blowing elements and the outlet of the exhaust air from the dryer can be performed in many different ways, also in other ways than presented in these Figures. It is e.g. possible to arrange connections from the end of the dryer and, in addition, to arrange inside the dryer the channels needed for the distribution of the blow air and for the collecting of the exhaust air evenly in the web cross direction.

Landscapes

  • Drying Of Solid Materials (AREA)
  • Paper (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Percussion Or Vibration Massage (AREA)

Abstract

The object of the invention is an air dryer in the dryer section of a paper machine, which dryer comprises at least one exhaust air chamber (6, 14) arranged on a first side of the paper web (2) and at least one nozzle box (4, 15a-15e, 17a-17c) arranged inside said exhaust air chamber (6, 14), into which nozzle box (4, 15a­15e, 17a-17c) one or more blowing elements (26) have been arranged in order to blow hot air to the paper web (2), into which exhaust air chamber (6, 14) at least one air exhaust element has been arranged, and in the central area between the forward end and the tail end of said air dryer (1), in the machine direction, the paper web (2) has been arranged to travel without support elements arranged on a second side of the web. An air dryer according to the invention is characterized in that the location of said nozzle box (4, 15a-15e, 17a-17c) and/or said one or more blowing elements (26) with regard to the paper web (2) has been arranged so as to be changeable with the aid of an adjusting element. The object of the invention is also a method in drying a paper web.

Description

AIR DRYER
The object of the invention is an air dryer in the dryer section of a paper machine, which air dryer comprises at least one exhaust air chamber arranged on a first side of the paper web, and at least one nozzle box arranged inside said exhaust air chamber, into which nozzle box one or more blowing elements have been arranged in order to blow hot air to the paper web, in which exhaust air chamber at least one air exhaust element has been arranged, and in the central area between the forward end and the tail end of said air dryer, in the machine direction, the paper web has been arranged to travel without support elements arranged on a second side of the web. A further object of the invention is a method in drying a paper web, in which method drying gas is blown towards the paper web with the aid of one or more blowing elements arranged into at least one nozzle box arranged inside at least one exhaust air chamber, the paper web being arranged to travel without support elements arranged on the second side of the web, the drying gas being in contact with the paper web, humidity present in the paper web passes into the drying gas, whereby the drying gas transforms into return air, and return air is exhausted via at least one air exhaust element arranged into at least one exhaust air chamber.
In paper making, it is known to use different kinds of dryers for drying a paper web, and also especially coatings of coated paper. Infra dryers and flotation dryers are efficient and largely used means, which both have their own advantages and disadvantages. At certain points of a coating machine, it is necessary to leave the other side of the web open, usually the lower side, because in that way it is easier to act after web breaks. Also the risk of a fire is then smaller. Sometimes there is not enough space for the use of a double-sided flotation dryer, and then an infra dryer is usually used. With regard to an optimal way of drying, the general opinion is that the coating is usually wanted to be heated into a sufficiently high temperature and only after that the evaporation is started. An infra dryer suits well for heating, as in it the mass transfer is small. On the other hand, in a long infra dryer group the temperature of the web easily rises too high, which is detrimental in view of the quality of the coated paper. The solution presented e.g. in the applicant's patent publication FI 108870 shows one typical flotation dryer.
The US patent publication 4,292,745 presents a double-sided flotation dryer in which the paper web travels between two nozzle series in which the location of the nozzles can be changed. In this solution the paper web is thus supported by the air jets coming from the nozzles.
An object of the invention is to achieve an air dryer with which the efficiency of the drying can be improved. A special object of the invention is to present an air dryer that can be operated also with thin paper grades and, furthermore, in cases where a so called loose web escapes away in the area of the air dryer.
An object of the invention is an air dryer according to the independent claim 1 as well as the method for drying a paper web according to the independent claim 11.
An object of the invention is an air dryer in the dryer section of a paper machine, which dryer comprises at least one exhaust air chamber arranged on a first side of the paper web and at least one nozzle box arranged inside said exhaust air chamber, into which nozzle box one or more blowing elements have been arranged in order to blow hot air to the paper web, into which exhaust air chamber at least one air exhaust element has been arranged, and in the central area between the forward end and the tail end of said air dryer, in the machine direction, the paper web has been arranged to travel without support elements arranged on a second side of the web. An air dryer according to the invention is characterized by the fact that the location of said nozzle box and/or said one or more blowing elements with regard to the paper web has been arranged so as to be changeable with the aid of an adjusting element.
By the means of an air dryer according to the invention, it is thus possible to improve the efficiency of the drying, as the dryer can be brought nearer to the web. In addition, an air dryer according to the invention can be used also with thin paper grades and in cases where the so called loose web escapes away in the area of the air dryer, because the location of the nozzle box and/or blowing elements with respect to the paper web can be adjusted. The air dryer according to the invention has been arranged on one side of the paper web, only.
In this connection, by support elements it is meant e.g. rolls or air jets. The nozzle box and/or said one or more blowing elements can also be called by a common name blow surface.
The air dryer solution according to the invention can also be used for cooling the paper web, whereby the heated blow air is replaced with cooled blow air.
As blowing elements it is advantageous to use overpressure nozzles which direct to the web a force pushing away from the nozzle. The expulsive force of the overpressure nozzles has to be suitable for the purpose. The expulsive force depends on the distance between the nozzle and the web, so that when the distance is smaller, the expulsive force is stronger. The underpressure of the exhaust air chamber can be affected with the aid of the amount of the exhaust air, and the underpressure tends to pull the web towards the dryer. Moving the dryer closer to the web and even over the web line, as well as making the dryer more curved, increases the force caused by the web tension with which the web stabilizes towards the dryer. The increase of the web tension boosts this force component. According to an advantageous embodiment of the invention, the location of the nozzle box and/or one or more blowing elements with respect to the paper web is arranged so as to be changeable during the paper machine run. In this case it is possible to intervene in the efficiency of the drying at any time and to adjust the distance so as to be suitable. Adjustments can be effected when necessary, and even at very short intervals. It is also clear that the adjustment can be arranged to be manual or automatic, for example so that suitable detecting elements measure the paper web's line of travel, and thus guide the location of the nozzle box and/or the blowing element or elements.
According to another embodiment of the invention, the distance of the nozzle box and/or one or more blowing elements from the paper web has been arranged so as to be changeable between 0,1 and 120 mm. So, if the distance of the blow box from the paper web can be adjusted at least by several millimeters, preferably a few tens of millimeters, the adjustment range is for the most cases quite sufficient for the distance of the paper web and the blow surface of the air dryer to be suitable. It is clear that the distance can be arranged so as to adjustable e.g. by distances of 1-15 mm, 5-25 mm, 5-100 mm, 25-120 mm, 25-75 mm, or something else.
According to a further embodiment of the invention, the nozzle box and/or one or more blowing elements have been arranged so as to be adjustable over the theoretical paper web line. Thus, the web being particularly loose, the nozzle surfaces of the nozzle box can be adjusted so as to exceed the theoretical web line, i.e. to force the paper web to curve. Then even a loose web is made stabile. To a person skilled in the art, it is clear that a dryer according to the invention can be arranged also so that the blowing elements are arranged so as to be adjustable also in the cross direction of the web. In an air dryer according to the invention, said one or more blowing elements can be arranged into the nozzle box in a fixed or a mobile manner, i.e. the above- mentioned adjustment can be performed either by adjusting the entire nozzle box, or by adjusting only the blowing element arranged in it in a mobile manner.
In an air dryer according to the invention, the declination of the nozzle box and/or one or more blowing elements can be arranged so as to be adjustable in the machine direction. In this manner, the form of the lower part of the air dryer can be made to match even better the curved form of the paper web. Thus, adjusting devices are needed respectively for suitably directing the nozzle box or blowing elements. By adjusting the flexure and location of the blow surface with regard to the web line, it is possible to achieve a stabile web run with different web tensions.
According to one embodiment of the invention, said air exhaust element is an exhaust air gap. The air exhaust element can also be some other solution known as such to a person skilled in the art, such as an exhaust air duct or a combination of exhaust air ducts.
According to one embodiment of the invention, the air dryer has three nozzle boxes and four exhaust air gaps. In this way, a very versatile dryer is achieved which is adjustable e.g. so that the outermost nozzle boxes are located higher than the middlemost, i.e. the nozzle boxes and the exhaust air gaps can be placed in a curved form, as often the paper web takes up a curved form, also. Thus, the efficiency of the air dryer is approximately the highest possible thanks to the suitably small interspace. The curved form is also more advantageous in view of the stability of the web. According to an other embodiment of the invention, the nozzle box is at least somehow insulated in order to prevent the blow air from cooling, whereby savings in energy are achieved, as the energy used for heating can more easily be directed to the object itself. In an air dryer according to the invention, any blow air temperature and velocity suitable for the process can be used. By way of an example, if the temperature of the blow air is in the rage of 300-700°C, and the blow velocity is 40-60 m/s, the air dryer can be built rather small in size thanks to the high temperature of the drying air. As the blow velocity is rather low, the amount of circulating air and the size of the air devices remain also small.
It is also possible to mix machine room air into the return air to be exhausted from the air dryer, whereby the temperature of the return air can be fallen and it works as substitute air at the same time.
According to a further embodiment of the invention, the air dryer has been arranged so as to be asymmetric, so that a greater part of the return air is exhausted from the outlet side than from the inlet side of the paper web. Thus, the return flows can be better controlled as the paper web itself tends to move blow air along it.
In an air dryer according to the invention, the amount of the air to be blown is advantageously essentially the same as the amount of the air to be exhausted. In this way, the paper web can be controlled so that the paper web remains approximately in the same position, and the nozzle box and/or the blowing elements can be arranged to a suitable point by a suitable adjusting device in order to achieve a high drying efficiency. It is also possible to change the ratio of the amounts of the air to be blown and the air to be exhausted, even by over 15 %, as even in this way the stability of the paper web can be improved.
An object of the invention is also a method in drying a paper web, in which method - drying gas is blown towards the paper web with the aid of one or more blowing elements arranged in at least one nozzle box arranged inside at least one exhaust air chamber, which paper web has been arranged to travel without support elements arranged on a second side of the web,
- the drying gas being in contact with the paper web, humidity present in the paper web passes into the drying gas, whereby the drying gas transforms into return air, and
- the return air is exhausted via at least one air exhaust element arranged into at least one exhaust air chamber,
The method according to the invention is characterized by the fact, that in order to boost the drying, the location of said at least one nozzle box and/or said one or more blowing elements is changed with respect to the paper web.
According to an advantageous embodiment of the method according to the invention, the location of said nozzle box and/or said one or more blowing elements with respect to the paper web is changed during the paper machine run.
It is obvious that the above-presented optional additional features and embodiments also suite for the utilizing of the method according to the invention.
In the following, the invention is presented more in detail with reference to the accompanying drawing in which
Fig. 1 presents schematically as a cross section view an air dryer according to the first embodiment of the invention; Fig. 2 presents schematically as a cross section view a solution according to the second embodiment of the invention;
Fig. 3 presents schematically as a cross section view an air dryer according to the third embodiment of the invention;
Fig. 4 presents schematically as a cross section view an air dryer according to the fourth embodiment of the invention, and
Fig. 5 presents schematically as a perspective view an air dryer according to Fig 4.
In the different Figures of the drawing, the reference numeral 1 is used for indicating an air dryer according to the invention, which air dryer can present any of the embodiments of the invention.
In Fig. 1 of the drawing, the reference numeral 1 is used for indicating, as a cross section view, an air dryer according to the first embodiment of the invention and equipped with only one blow box. The reference numeral 2 presents the paper web with an arrow indicating the direction of run. The air blowable to the paper web 2 is brought via a channel (not shown) into the inner space 3 of the nozzle box 4 that is thermally insulated to some extent. The nozzle box 4 is in the inner space 5 of the exhaust air chamber 6, and inside the nozzle box 4 there is a venting plate 7. Into the nozzle box 4, it has been integrated a blowing element 26 which is a structure from where hot air is blown towards the web through blow openings, which in here are holes. Blowing of hot air towards the web has been indicated with reference numerals 8a - 8h. The blowing element can be e.g. an air distribution element or a structure from which hot air is blown towards the web through blow openings, which usually are holes, even though also blow slots in right angle, seen in the machine direction, are used. Before blowing to the web, outflow takes place in the machine direction through an air exhaust element, in this case through an exhaust air gap 9a in the direction of arrows 10a and 10b, and in the machine direction after blowing to the paper web, through an exhaust air gap 9b in the direction of arrows 10c and lOd. In the exhaust air gaps there are flow equalizing plates 11a and l ib. The nozzle box 4 is movable by an up and down mechanism at least about 5 cm or at the most about 10 cm. It has to be noted, that the paper web can be of a width of several meters, even 10 m, so, already in the designing stage, the stiffness of the devices needs to be drawn up so as to be sufficiently high. At the location of the device, on the second side of the paper web, no roll is used.
Fig. 2 presents a solution according to the second embodiment of the invention, in which two air dryers 1 according to the first embodiment of the invention are used in succession for drying the paper web in the space between the rolls 12 and 13.
Fig. 3 presents an air dryer according to the third embodiment of the invention, in which the blowing elements are the nozzle boxes 15a - 15e. Furthermore, the exhaust air gaps 16a - 16f are inside the same exhaust air chamber 14. In this solution, it is also possible to adjust the distance of the nozzle boxes 15a - 15e and the exhaust air gaps 16a - 16f from the paper web during the machine run by a mechanism which is not presented here as it is known as such from other purposes of use. Many kinds of applications are offered as a solution, e.g. the use of a stepping motor, eccentric constructions, pressure medium solutions, etc. It is, however, important to choose a solution that will last the hot circumstances present in this kind of air dryers during the use. The adjustments of location and declination can be performed as manually operated solutions or remote-controlled or automatized solutions, in which an automatized equipment monitors the web and transfers the blow nozzles when necessary. Fig. 4 presents an air dryer according to the fourth embodiment of the invention, in which there are sequentially, in the machine direction, three box-like nozzle boxes 17a, 17b and 17c of which at least the utmost can be adjusted with regard to their location. The reference numerals 18a and 18b indicate the axis points depending on which the nozzle boxes 17a and 17c, respectively, are supported from one of their edges. The other edges are adjustable in height during the machine run and they can be locked at a desired height. The reference numeral 19a and 19b, respectively, indicate adjusting elements, slots, tensioning devices, and the like, with which the nozzle boxes 17a and 17c can be transferred during the run at a desired location in order to obtain an optimal drying performance. The installation of three nozzle boxes 17a - 17c in the air dryer naturally also requires an installation of air channels in the structure. The hot blow air is brought via the duct 20 into the air dryer and via branches 21a and, respectively, 21b to the nozzle boxes 17a and 17c located at the edges. As the structure contains mobile parts, bellows 22a and 22b are used for to allow the changes of location. As in some cases the paper web has the form of a large curve under the air dryer, it is necessary to place the nozzle box 17a, which is first in the machine direction, with its inlet side higher than its outlet side and, respectively, the last nozzle box 17c in reverse order with regard to the nozzle box 17a. In this manner, a combination in the form of an approximately large curve is obtained from the lower parts of the nozzle boxes 17a - 17c, whereby the paper web is at every point at an approximately same and rather short distance from the air dryer. Thus, the drying effect is efficient. This arrangement also provides for a stabile web run.
Fig. 5 presents an air dryer of Fig. 4 as a perspective view. In addition to the duct 20 that brings along blow air, there is an exhaust air duct 23 in the upper part. The structure of the nozzle box 17a is presented more in detail. The adjusting elements 19a and the axis point 18a are to be seen near to the edges of the nozzle box 17a. The reference numerals 24, 25a and 25b present the blow surface. The blowing elements can be arranged into different parts of the blow surface, e.g. into parts 25a and 25b, and possibly into part 24. Exhaust air gaps 16a and 16b are arranged on both sides of the blow surface. In principle, the amount of the inlet air is approximately the same as the amount of the exhaust air, even though by varying the ratio of the amounts of air (even over 15 %) the stability of the web can be improved.
To a person skilled in the art, it is clear that the inlet of air to the blowing elements and the outlet of the exhaust air from the dryer can be performed in many different ways, also in other ways than presented in these Figures. It is e.g. possible to arrange connections from the end of the dryer and, in addition, to arrange inside the dryer the channels needed for the distribution of the blow air and for the collecting of the exhaust air evenly in the web cross direction.
Some principled and structural solutions according to the invention have been presented above. Known solutions for heating air and treating of exhaust air have not been presented, as they are known technique. The structural parts needed for the adjustment of the location of the elements are known from other connections, and that is why they are not presented in detail here. As the temperature of the flowing air can be considerably high, solutions that last said heat and that work in a reliable way in said temperatures need to be chosen for use. It is to be noted, that the paper web 2 may also have another position than the horizontal position shown in the Figures. In some cases, e.g. due to space use or the machine layout, the paper web 2 can be substantially inclined, even vertical in the machine direction, whereby the dryer 1 according to the invention has to be placed in an inclined position, respectively. For the sake of clarity, the paper web 2 has always been presented in a horizontal position in the preceding Figures. The invention is not limited to the enclosed embodiment, but several modifications of it can be considered in the terms of the enclosed claims. The reference numerals presented in the claims do not limit the invention.

Claims

Claims
1. An air dryer in the dryer section of a paper machine, which air dryer comprises at least one exhaust air chamber (6, 14) arranged on a first side of a paper web (2) and at least one nozzle box (4, 15a-15e, 17a- 17c) arranged inside said exhaust air chamber (6, 14), into which nozzle box (4, 15a-15e, 17a-17c) one or more blowing elements (26) have been arranged in order to blow hot air to the paper web (2), in which exhaust air chamber (6, 14) at least one air exhaust element has been arranged, and in the central area between the forward end and the tail end of said air dryer (1), in the machine direction, the paper web (2) has been arranged to travel without support elements arranged on a second side of the web, characterized in that the location of said nozzle box (4, 15a-15e, 17a- 17c) and/or said one or more blowing elements (26) with regard to the paper web (2) has been arranged so as to be changeable with the aid of an adjusting element.
2. An air dryer according to claim 1, characterized in that the location of the nozzle box (4, 15a-15e, 17a-17c) and/or one or more blowing elements (26) with regard to the paper web (2) has been arranged so as to be changeable during the paper machine run.
3. An air dryer according to claim 1 or 2, characterized in that the distance of the nozzle box (4, 15a-15e, 17a-17c) and/or one or more blowing elements (26) from the paper web (2) has been arranged so as to be changeable between 0,1 and 120 mm.
4. An air dryer according to any of the preceding claims, characterized in that the nozzle box (4, 15a-15e, 17a-17c) and/or one or more blowing elements (26) have been arranged so as to be adjustable over the theoretical paper web line.
5. An air dryer according to any of the preceding claims, characterized in that the declination of the nozzle box (4, 15a-15e, 17a- 17c) and/or one or more blowing elements (26), in the machine direction, has been arranged so as to be adjustable.
6. An air dryer according to any of the preceding claims, characterized in that the air exhaust element is an exhaust air gap.
7. An air dryer according to any of the preceding claims, characterized in that it has three nozzle boxes and four exhaust air gaps.
8. An air dryer according to any of the preceding claims, characterized in that the temperature of the blow air is in the range of 300-700°C and the blow velocity is 40-60 m/s.
9. An air dryer according to any of the preceding claims, characterized in that it has been arranged so as to be asymmetric so that a greater part of the return air is exhausted from the outlet side than from the inlet side.
10. An air dryer according to any of the preceding claims, characterized in that the amount of the air to be blown is essentially the same as the amount of the air to be exhausted.
11. A method in drying of a paper web, in which method
- drying gas is blown towards the paper web with the aid of one or more blowing elements arranged in at least one nozzle box arranged inside at least one exhaust air chamber, which paper web has been arranged to travel without support elements arranged on a second side of the web, - the drying gas being in contact with the paper web, humidity present in the paper web passes into the drying gas, whereby the drying gas transforms into return air,
- the return air is exhausted via at least one air exhaust element arranged into at least one exhaust air chamber,
characterized in that in order to boost the drying, the location of said at least one nozzle box and/or said one or more blowing elements is changed with respect to the paper web.
12. A method according to claim 11, characterized in that the location of the nozzle box and/or one or more blowing elements is changed with respect to the paper web during the paper machine run.
EP03735742A 2002-06-28 2003-06-27 Air dryer Expired - Lifetime EP1532314B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20021291 2002-06-28
FI20021291A FI114934B (en) 2002-06-28 2002-06-28 Improved air dryer
PCT/FI2003/000524 WO2004003291A1 (en) 2002-06-28 2003-06-27 Air dryer

Publications (2)

Publication Number Publication Date
EP1532314A1 true EP1532314A1 (en) 2005-05-25
EP1532314B1 EP1532314B1 (en) 2006-11-29

Family

ID=8564275

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Application Number Title Priority Date Filing Date
EP03735742A Expired - Lifetime EP1532314B1 (en) 2002-06-28 2003-06-27 Air dryer

Country Status (7)

Country Link
EP (1) EP1532314B1 (en)
AT (1) ATE346973T1 (en)
AU (1) AU2003238123A1 (en)
DE (1) DE60310085T2 (en)
ES (1) ES2274245T3 (en)
FI (1) FI114934B (en)
WO (1) WO2004003291A1 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4292745A (en) * 1978-08-29 1981-10-06 Caratsch Hans Peter Air foil nozzle dryer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004003291A1 *

Also Published As

Publication number Publication date
WO2004003291A1 (en) 2004-01-08
FI114934B (en) 2005-01-31
DE60310085T2 (en) 2007-06-28
DE60310085D1 (en) 2007-01-11
EP1532314B1 (en) 2006-11-29
FI20021291A7 (en) 2003-12-29
ATE346973T1 (en) 2006-12-15
AU2003238123A1 (en) 2004-01-19
FI20021291A0 (en) 2002-06-28
ES2274245T3 (en) 2007-05-16

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