JP2019508657A - Yankee dryer cylinder operated without using steam - Google Patents

Abstract

An inlet (23) for passing the stream of hot air (100) into the cavity (21) and an outlet (24) for letting the stream of hot air (100) pass and escape the dryer cylinder (1) Yankee dryer cylinder (1) equipped with a fixed hollow shaft (20) with and. The Yankee dryer cylinder (1) further comprises a cylindrical shell (10) having an inner surface (11) and rotatably mounted about a fixed hollow shaft (20). Into the cavity (21) a dividing wall (25) is provided which divides the fixed hollow shaft (20) into a supply portion (21a) and a discharge portion (21b).
[Selected figure] Figure 1

Description

  The present invention relates to the field of machines for producing paper and similar products, and in particular to the improved construction of the Yankee dryer cylinder, or dryer cylinder also known simply as the Yankee cylinder.

  As is known, papermaking equipment uses headboxes to distribute mixtures of cellulosic fibers and water, and in some cases, various types of additives, on a forming fabric. In this method, a fixed amount of water is drained, and then the drying of the mixture layer prepared on the forming fabric is increased.

  The water content is then reduced by passing sequentially through the felt of many cloths and / or mixture layers to a consistency that allows it to pass through the drying compartment. This section usually comprises at least one dryer cylinder, also called "Yankee dryer cylinder" or simply "Yankee cylinder", and a drying hood supplied with hot air. In particular, the web of treated wet paper web is loaded on the outer surface of the Yankee cylinder while at the same time the interior of the Yankee cylinder is heated, for example by generating steam.

  The steam generated inside the Yankee cylinder and the hot air blown by the hood on the paper gradually dry the wet paper web loaded on the outer surface. Once the desired level of drying is achieved, the paper web is removed from the outer surface of the Yankee cylinder, by a blade or doctor blade, or by tensioning, which is the desired product, and in particular crepe paper. It depends on whether it is smooth paper.

  The Yankee cylinder essentially comprises two heads, namely end walls, between which a cylindrical shell is located. In general, in the operating state, bearing journals mounted on the respective bearings are fixed to each head. A hollow shaft is mounted inside the shell. The head and / or the shell is provided with an inspection opening through which at least a worker enters the cylinder and performs regular or special maintenance operations regularly.

  The components of the Yankee cylinder, ie the head, the shell, the bearing journals etc., can be obtained by casting of iron and can be fixed by bolts.

  Alternatively, the Yankee cylinder may be made of steel. In this case, the two heads may be fixed to the cylindrical shell by screw bolts or, more often, by welded beads.

  In both cast iron and steel Yankee cylinders, the cylindrical shell has an inner surface with circumferential grooves. These are designed to collect the condensate formed by the latent heat of vaporization moving from the steam introduced into the inside of the Yankee cylinder to the outside.

  However, Yankee cylinders, which use steam as a source of thermal energy, have many drawbacks.

  First, the large amount of steam needed for these types of machines is associated with high running costs. In addition, certain equipment must be used to both generate steam and transport the steam to the Yankee cylinder.

  In addition to the above, the high stresses to which various parts of the dryer cylinder are subjected, in particular by the high temperatures of the steam introduced inside the dryer cylinder, in particular in order to meet the safety standards set for devices using high pressure steam. It is necessary to adopt a complicated structural solution so as to withstand the thermoelastic stress that occurs.

  Another solution of the background art is alternatively to supply a flow of air into the cylinder, which is subsequently burned by one or more burners to obtain the necessary thermal energy . An example of a Yankee cylinder using air is described in European Patent Application No. 0708301 A1.

  In particular, the solution described herein provides a central duct and a shell that rotates around the shaft. The combustion air is introduced through the ducts and supplied to several burners arranged at defined positions inside the cylinder. Thus, the burner generates heat which strikes the shell. The smoke escapes from the central duct opposite the air inlet.

  However, the solution described in U.S. Pat. No. 7,070,301 A1 does not appear to be particularly advantageous. In fact, it is necessary to provide a considerable amount of space in the housing of the burner, the housing of the air supply duct and the housing of the exhaust duct of the combustion gas. This greatly reduces the surface available for heat exchange and thus reduces the efficiency of the machine.

  Furthermore, it appears that the solution described in the same 0708301 Al can not evenly distribute the heat generated on the shell surface, in particular due to the presence of the burner and the duct. This negatively impacts the quality of the final product.

  A further disadvantage of this solution described in the same 0708301 is that, in addition to the expense of the efficiency of the installation, the internal volume of the cylinder can saturate with flammable gases, thus producing an internal burner Flames can cause explosions and thus expose workers to danger.

  A further solution is described in US Pat. No. 3,633,662. However, this structural solution is also complicated and does not guarantee uniform heat distribution on the inner surface of the shell.

  Thus, the object of the present invention can solve the drawbacks of the prior art Yankee cylinder disclosed above and, in particular, provide a uniform heat distribution on the inner surface of the shell and thus a high quality final product It is to provide a Yankee dryer cylinder that can be manufactured.

  It is also an object of the present invention to provide a Yankee dryer cylinder that can significantly reduce the running cost of the installation when installed.

  A further object of the present invention is to provide a cheaper Yankee dryer cylinder with a simpler construction than prior art Yankee cylinders.

This and other objects are realized by the Yankee dryer cylinder according to the invention, which Yankee dryer is:
A fixed hollow shaft having a cavity and a side with a plurality of holes arranged to communicate said cavity with the external environment:
-An inlet section adapted to pass a stream of hot gas having a predetermined temperature, in particular a temperature above 100 ° C., to be supplied into the cavity;
A fixed hollow shaft with an outlet adapted to pass the flow of hot gas and to flow out of the dryer cylinder;
A cylindrical shell having an inner surface and rotatably mounted about the fixed hollow shaft, wherein an inner chamber is defined between the inner surface of the cylindrical shell and the side of the hollow shaft Equipped with a shell;
Its main features are:
-A partition mounted inside the cavity is further provided so as to divide the fixed hollow shaft into a supply portion and a discharge portion, and the supply portion has a flow of the high temperature gas as the inner surface. At least one supply hole arranged to supply the internal chamber with the cavity, and the discharge part comprises at least one discharge hole pneumatically connected to the outlet portion; A stream of hot gas is applied to the inner surface of the shell and then adjusted to pass from the inner chamber to the cavity through the discharge holes, i.e. through the respective discharge holes, to escape from the Yankee dryer cylinder through the outlet. It is to be.

  In particular, the hot gas may be a mixture of gases.

  Advantageously, the mixture of gases may in particular be air.

  Advantageously, the temperature of the hot gas stream is set between 100 ° C. and 750 ° C., advantageously between 250 and 700 ° C., preferably between 300 ° C. and 600 ° C. It may be set between.

  Alternatively, the flow of hot gas may be a stream of combustion smoke having a temperature higher than 100.degree.

  In particular, a supply device is provided to supply a flow of hot air, said supply being arranged to supply the flow of hot air into the supply portion of the cavity through the inlet.

  In the provided embodiment, a suction device connected to the outlet of the fixed hollow shaft is provided downstream of the Yankee dryer cylinder. In particular, the suction device is arranged to suction the flow of hot gas supplied through the inlet into the hollow shaft of the fixed hollow shaft. In this way it is possible to assist the gas escaping the dryer cylinder.

  Advantageously, the inner surface of the cylindrical shell is provided with a plurality of circumferential grooves.

  Preferably, a plurality of distributor members are provided in an internal chamber arranged to distribute the flow of hot air coming from the cavity of the fixed hollow shaft on the inner surface of the shell.

  In particular, each of the plurality of distributor members disclosed above distributes the distribution of the flow of hot air supplied into the fixed hollow shaft cavity on a respective defined portion of the inner surface of the shell Arranged as.

  More particularly, the distributor member is configured to define a predetermined path of hot air between the cavity of the supply portion and the cavity of the discharge portion in the inner chamber.

  In particular, the Yankee cylinder and the fixed hollow shaft are arranged to be coaxial with each other.

  In an embodiment according to the invention, each distributor member is cylindrical and faces at least one inlet opening facing at least one feed hole of the side of the fixed hollow shaft and the inner surface of the cylindrical shell And at least one distribution opening.

  Similarly, the supply opening may be accompanied by a supply panel with a plurality of inlet holes. This technical solution is particularly adopted when the supply panel is arranged in front of a plurality of suction holes.

  According to a preferred embodiment, the distributor members disclosed above are integrated into a fixed hollow shaft.

  Advantageously, each distributor member is arranged in front of a predetermined number of suction holes.

  In particular, the feed section comprises a plurality of feed holes and the discharge section comprises a plurality of discharge holes. In this case, both the feed holes and the discharge holes are advantageously arranged in rows.

  In particular, the plurality of supply holes and the plurality of discharge holes are distributed along the entire circumference of the fixed hollow shaft.

  For example, the array of distributed supply and discharge holes may be the longitudinal orientation of the fixed hollow shaft.

  Advantageously, each distributor member may be oriented such that the respective supply opening is located above the respective row of suction holes.

  Preferably, at least first and second bearings are mounted and disposed at both end portions between the fixed hollow shaft and the Yankee cylinder.

According to another aspect of the invention, there is provided an apparatus for drying a wet web of paper, or similar product:
-A Yankee dryer cylinder as described above, with an outer surface on which the moist web to be dried is placed in use;
-A drying hood arranged, in use, on the opposite side of the Yankee dryer cylinder with respect to the damp web, operating in conjunction with the Yankee dryer cylinder to cause the damp web to dry Said drying hood disposed in
A duct arranged to pneumatically connect the drying hood to the cavity of the fixed hollow shaft, so as to supply a flow of hot air circulating inside the drying hood, A duct disposed inside the cavity;
Equipped with

In a further aspect of the invention, a method of drying a wet web of paper, or a similar product is:
Disposing a fixed hollow shaft having a cavity and a side provided with a plurality of holes arranged to connect said cavity to the external environment, said fixed hollow shaft being:
-An inlet adapted to pass the flow of hot air and to be supplied into the cavity;
-Providing an outlet for adjusting the flow of the high temperature air to flow through to the outside of the dryer cylinder;
A cylindrical shell having an inner surface and rotatably mounted about the fixed hollow shaft, wherein an inner chamber is defined between the inner surface of the cylindrical shell and the side of the hollow shaft Placing a shell;
-Arranging a partition mounted inside the cavity to divide the fixed hollow shaft into a supply part and a discharge part;
-Supplying a flow of hot air into the feed section, wherein the flow of hot air is passed from the cavity to the inner chamber through at least one feed hole provided in the feed section. And then apply to the inner surface, and then thereafter pass through the at least one discharge hole provided in the discharge portion into the discharge portion of the fixed hollow shaft, and then thereafter from the cylinder, After exiting through the outlet and applying the flow of hot air to the inner surface of the shell, it passes from the inner chamber through the outlet holes to the cavity to the outlet of the Yankee dryer cylinder. Adjusting as flowing through the
I will provide a.

Other features of the invention are set out in the dependent claims.
The present invention will now be illustrated using the following description of its exemplary embodiments and with reference to the accompanying drawings, which are illustrative but not limiting.

FIG. 1 shows a partially cutaway perspective sectional view of a Yankee dryer cylinder according to the present invention; Figure 2 shows the dryer cylinder of Figure 1 in longitudinal section; FIG. 3A shows an enlargement of a portion of the dispensing opening of the distributor member to focus attention on the dispensing panel provided in some details, in particular; FIG. 3B an alternative embodiment of the distribution panel of FIG. 3A. Show; Figure 4 shows in a perspective elevation view of the dryer cylinder according to the invention in the headless state; FIG. 5 illustrates in a perspective elevation the fixed hollow shaft in operation; Fig. 6 shows the fixed hollow shaft of Fig. 5 cut along the longitudinal plane; Figure 7 shows the dryer cylinder according to the invention in the headless state, in a different perspective elevational view different from that of Figure 5; Fig. 8 illustrates an enlargement of a distribution panel provided in accordance with the invention at the distribution port; FIG. 9 shows an alternative embodiment of the fixed hollow shaft of FIG. 6 in a perspective view in longitudinal section; Fig. 10 shows a longitudinal view of a first embodiment of the Yankee cylinder with an alternative embodiment of the fixed hollow shaft of Fig. 9; 11 shows a longitudinal view of an alternative embodiment of the Yankee cylinder of FIG. 10, with an alternative embodiment of the fixed hollow shaft of FIG. 9; Figure 12 shows a perspective view of a further alternative embodiment of the fixed hollow shaft of Figure 6; Figure 13 shows a cross-sectional view of the fixed hollow shaft of Figure 12; Fig. 14 shows an enlarged view of a portion of Fig. 13 in order to focus on some features of the invention; FIG. 15A shows two possible alternative embodiments of the apparatus for drying a wet web of paper according to the invention; FIG. 15B two possible possibilities of an installation for drying a wet web of paper according to the invention Shows an alternative embodiment;

  As illustrated in FIG. 1, the construction of the Yankee dryer cylinder 1 according to the invention comprises a cylindrical shell 10 having an inner surface 11. In addition, first and second heads or end walls 71 and 72 are provided and fixed at the ends of the cylindrical shell 10. The shell is rotatably mounted around a fixed hollow shaft 20 having a cavity 21 and a side 22 with a plurality of holes 25. The fixed hollow shaft 20 is provided in particular with an inlet 23 through which a stream 100 of hot gas, preferably a stream of hot air, in particular having a temperature above 100 ° C., is fed into the cavity 21 Ru. The temperature of the hot air is preferably 700 ° C. in order to avoid that too high thermoelastic stresses occur in the structure of the cylinder 1.

  The fixed hollow shaft 20 further comprises an outlet 24 on the opposite side of the inlet 23. The stream 100 of hot air introduced through the inlet 23 impinges on the inner surface 11 of the shell 10 and then exits the dryer cylinder 1 through the outlet 24.

  According to the present invention, the dividing wall 35 is provided in the cavity 21 and the hollow body 20 is arranged downstream of the dividing wall 35 and the fixed supply portion 20a arranged upstream of the dividing wall 35 It is mounted so as to be divided into the discharge portion 20b (FIG. 6).

  The flow 100 of hot air supplied into the cavity 21 of the supply portion 20a passes through the plurality of supply holes 25a and is an internal chamber defined between the inner surface 11 of the cylindrical shell 10 and the side 22 of the hollow shaft 20. Adjusted to be within 30. Thus, the flow 100 of hot air strikes the inner surface 11 and thereafter enters the exhaust portion 21 b of the cavity 21 through the plurality of exhaust holes 25 b. These outlet holes are in particular closer to the outlet 22 than the supply holes 25a.

  In the embodiment shown, for example in FIGS. 1, 2 and 6, the dividing wall 35 is substantially transverse to the fixed hollow shaft 20, in particular relative to the longitudinal axis 102 of the fixed hollow shaft 20. It is disposed to be orthogonal to one another. Thus, in this case, the supply portion 20 a is close to the inlet 23 and the discharge portion 20 b is close to the outlet 24.

  In the alternative embodiment shown in FIGS. 9 and 10, the septum 35 is instead the longitudinal orientation of the fixed hollow body 20. In this case, the delivery portion 20a is located at the top of the fixed hollow shaft 20, while the discharge portion 20b is located at the bottom.

  As shown, for example, in FIG. 1, the Yankee dryer cylinder 1 is provided with a plurality of distributor members 40 housed inside the inner chamber 30. More specifically, each distributor member 40 is adapted to distribute the distribution of the stream 100 of hot air coming from the supply portion 21 a of the cavity 21 on a respective predetermined portion of the inner surface 11 of the shell 10.

  As shown in detail in FIGS. 4 and 6, the distributor member 40 may be the radial orientation of the Yankee cylinder 10. In particular, each distributor member 40 may extend in the longitudinal direction of the Yankee cylinder 10.

  In the alternative embodiment illustrated, and by way of example in FIGS. 4 and 7, each distributor member 40 is cylindrical, for example in the form of an exemplary parallelepiped. In particular, each distributor member 40 comprises at least one inlet opening 41 facing at least the supply holes 25 a of the supply portion 20 a of the fixed hollow shaft 20 and at least one distribution facing the inner surface 11 of the cylindrical shell 10. An opening 42 may be provided.

  As shown in detail in FIG. 3A, the dispensing opening 42 of the distributor member 40 advantageously comprises a dispensing panel 45 provided with a plurality of dispensing holes 46. The distribution holes of this are uniformly distributed on the surface of the distribution panel 45 so that the distribution of the flow 100 of hot air delivered by the distributor member 40 is uniform on each part of the inner surface 11 of the cylindrical shell 10 Can be distributed. In an alternative embodiment shown in FIG. 3B, the distribution holes 46 of the distribution panel 45 are frusto-conical. In this way it is possible to reduce the pressure drop in the holes and thus to increase the flow of hot air which strikes the shell 10.

  It is appropriate to specify in FIG. 3 that the inner surface 11 of the shell 10 with a plurality of circumferential grooves 15 is shown, by way of example only. In fact, according to the invention, the inner surface 11 of the shell 10 does not necessarily have to be provided with circumferential grooves. The distribution panel 45 may be a distribution plate made of a rigid material. Alternatively, the distribution panel 45 may be made of a porous material, such as woven or non-woven, or similar material with a predetermined level of porosity. In this case, the pores of the material from which the panel is made act as distribution holes.

  As shown, for example, in FIG. 7, the distributor members 40 are arranged at a predetermined distance from one another and the distribution openings 42 are arranged at a predetermined distance from the inner surface 11 of the shell 10. More particularly, the space 50 is defined by the sides of the two adjacent distributor members 40 facing each other 43 and 44, and in use, the escaping flow of hot air passes therethrough. In fact, the flow of hot air coming from the cavities 21 of the fixed hollow shaft 20, once distributed by the respective distributor members 40 on corresponding parts of the inner surface of the cylindrical shell 10, the original distribution from which the heat flow came It is forced into the space 50 arranged downstream of the vessel 40, in particular due to the rotational movement of the cylindrical shell 10. Once the flow 100 of hot air transfers its heat at the inner surface 11 of the shell 10, it cools and passes through the space existing between two adjacent distributor members 40 and fixed hollow shaft Head to the twenty discharge holes 25b. Thus, a flow 100 of hot air first enters the cavity 21 from the space 50 described above through the exhaust hole 25 b and then exits through the outlet 24 to the exterior of the fixed hollow shaft 20. This passage may occur by means of a suction device, which is arranged downstream of the outlet 24 of the fixed hollow shaft 20, which is not shown for reasons of simplification.

  In the preferred embodiment shown in FIGS. 1-7, the supply holes 25a and the discharge holes 25b are arranged in rows in the longitudinal direction of the fixed hollow shaft 20, respectively. More precisely, as shown in detail in FIGS. 5 and 6, the supply holes 25a and the discharge holes 25b are each staggered as shown in the figure when the shaft 20 is of cylindrical geometry. The longitudinal rows are arranged, ie on the outer surface of the fixed hollow shaft 21 but on different generatrix, but also the axes 20 have different geometrical shapes, eg parallel When having a hexahedral geometry, they are arranged along various directions, but parallel to the axis of the shell 10. In particular, each row of exhaust holes 25b is disposed downstream of each row of supply holes 25a with respect to the direction of travel of the flow 100 of hot air along the inner surface 11 of the shell 10. This depends on the direction of rotation of the cylindrical shell 10 about its axis of rotation. Thus, in this way a path is obtained which is forced into the flow 100 of hot air, so this flow is from the cavity 21 of the fixed hollow shaft 20 through the feed holes 25a, e into the distributor member 40. After being forced into contact with the inner surface 11 of the cylindrical shell 10, it is passed into the space 50 defined between two adjacent distributor members 40.

  In the embodiment shown in FIGS. 9-11, the inlet 23 and outlet 24 are arranged on the same side of the fixed hollow body 20. In particular, a closing wall 26 is provided at the end of the fixed hollow shaft 20 opposite the inlet and opposite the outlet 24. In this way it is possible to simplify the structure. In fact, as shown in FIGS. 10 and 11, it is no longer necessary to use a duct with a large diameter to evacuate the hot air from the Yankee cylinder 1, but a shaft 80 with a smaller diameter is sufficient and therefore has a small size It is possible to use a bearing 62.

  Figures 12 and 13 illustrate a further alternative embodiment of the fixed hollow shaft 20 provided by the present invention. In this case, the partition 35 extends longitudinally along the fixed hollow shaft 20, but comprises two inclined plane portions 35a and 35b of a predetermined angle α. More particularly, the feed portion 20a of the fixed hollow shaft 20 with the feed hole 25a is in this case set between the two flat portions 35a and 35b. The outlet portion 20b provided with the outlet holes 25b is a portion of the fixed hollow shaft 20 corresponding to a central angle β, in particular a complex angle of the angle α. Thus, in this case the flow of hot air is delivered at the portion 13 of the inner surface 11 of the shell 10 of the Yankee dryer cylinder 1. Furthermore, the rotational movement of the shell 10 at high speeds, for example three revolutions per second, contributes to a substantially even distribution of the flow of hot air on all the inner surfaces 11 of the shell 10. Also, this embodiment includes one or more distributor members 40 with or without the distribution plate 45. As shown in detail in the enlarged portion of FIG. 14, the distributor member 40 is disposed at a predetermined distance d from the inner surface 11 of the shell 10.

  The hot air supplied to the cavity 21 of the fixed hollow shaft 20 is, in particular, as a flue gas, by a machine generating electrical energy or by a co-generator, ie a "turbo generator" or a Yankee according to the invention It can be obtained in the installation where the dryer cylinder 1 has to be installed, but also by means of another machine for generating energy, which is arranged in the vicinity of the installation. If it is necessary to reduce the temperature of the flue gas, which is usually about 600-700 ° C., such flue gas is cooled before it is supplied to the fixed hollow shaft 20, eg fresh flue gas It is sufficient to mix with the air.

  In this way it is possible to optimize the energy consumption of the installation with a significant reduction in running costs.

  Figures 15A and 15B illustrate two different embodiments of the installation 200 according to the invention for drying a wet web 160 of paper or similar products. In more detail, the installation 200 comprises a Yankee dryer cylinder 1, which is as described above with reference to FIGS. The Yankee cylinder 1 in particular comprises an outer surface 12 on which is located a damp web 160 to be dried in use. The installation 200 further comprises a drying hood 150 arranged to operate in conjunction with the Yankee cylinder 1 to dry the wet web of paper. Generally, the drying hood 150 provides a flow of hot air over the wet paper web 160 so as to absorb moisture generated by the wet paper web contacting the surface 12 of the Yankee dryer cylinder 1. Are arranged to According to the invention, the installation 200 further comprises a duct 180 arranged to pneumatically connect the drying hood 150 to the cavity 21 of the fixed hollow shaft 20. More specifically, the duct 180 is arranged to supply a flow of hot air circulating inside the drying hood 150 into the cavity 21. This particular solution makes it possible to optimize the energy consumption, in particular for generating hot air.

  In fact, as is known, inside the drying hood 150 located above the Yankee dryer cylinder 1, a high flow of hot air is circulating, and a part of the hot air is a wet web 160 of paper. It is generated by evaporation of moisture caused by contact with the outer surface of the cylinder 1, and a part of it is generated inside the drying hood 150 equipped with at least one burner for generating hot air, in particular a burner using methane gas. Do. The hot air generated inside the hood 150 is directed towards the wet web 160, which slides on the surface of the dryer cylinder, resulting in the drying of the moisture which evaporates from the web 160 of wet paper web.

  The drying hood 150 is in particular divided into a "wet" portion 151 and a "dry" portion 152. The present invention provides both the case where the duct 180 is connected to the dry portion (FIG. 15A) and the case where the duct 180 is connected to the wet portion of the hood 150 (FIG. 15B). To obtain this, the duct 180 may be connected directly to one of the two parts of the hood 150, as shown in FIGS. 15A and 15B, or may be connected directly to the respective exhaust ducts, This case is not shown in the figure for reasons of simplification.

  More precisely, the temperature of the air circulating inside the drying part of the drying hood is about 600-700.degree. Hot air that escapes from the dry part if the temperature of the available hot air is too high because of the possibility of generating high thermal stresses in the structure of the Yankee cylinder 1 and is therefore considered dangerous Can be mixed with cold before being introduced into the fixed hollow shaft 20.

  Instead, this problem does not exist if air is drawn from the wet portion of the hood 150. The wet part of the hood in particular passes a stream of hot air that is cooler than the air circulating inside the dry part. The temperature of the air circulating inside the wet part of the hood 150 is in fact about 300-400 ° C. and is therefore fed into the cavity 21 of the fixed hollow shaft 20 without causing the above-mentioned drawbacks It is ideal for In addition to the above, due to the fact that moist air is used, it is possible to increase the available thermal power over using dry hot air under the same temperature and because of the presence of moisture. is there.

  In a further alternative embodiment not shown in the figure, the hot air is drawn from both the dry part 152 and the wet part 151 of the hood 150 and two flows of these hot air are fixed in the hollow shaft The hot air can be mixed prior to being fed into the chamber.

  The foregoing exemplary embodiments of the present invention make the invention completely apparent from a conceptual point of view, and as a result, by applying the present knowledge to others, it is possible to do so for various applications. Embodiments may be modified and / or adapted without further investigation and without departing from the invention, and accordingly such adaptations and modifications must be regarded as equivalent to the specific embodiment. It should be understood that it will not. The means and materials for achieving the different functions described herein may, for this reason, have different properties without departing from the field of the invention. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation.

Claims (16)

A fixed hollow shaft (20) having a cavity (21) and a side (22) comprising a plurality of holes (25) arranged to connect said cavity (21) to the external environment. T:
-An inlet section (23), which is adapted to pass a stream (100) of hot gas having a predetermined temperature, in particular a temperature above 100 ° C, to be supplied into said cavity (21);
-A hollow shaft (20) comprising an outlet (24) ready to pass the hot gas stream (100) out of the dryer cylinder (1);
A cylindrical shell (10) provided with an inner surface (11) and rotatably mounted about said fixed hollow shaft (20), said inner surface (11) of said cylindrical shell (10) and said A cylindrical shell (10) having an inner chamber (30) defined between the hollow shaft (20) and the side (22) of the hollow shaft (20);
Yankee dryer cylinder (1) equipped with:
-It further comprises a partition (35) mounted in the cavity (21) so as to divide the fixed hollow shaft (20) into a supply part (20a) and a discharge part (20b), At least one of the supply portions (20a) is arranged to supply the flow (100) of hot gas from the cavity (21) to the inner chamber (30) in such a way as to impinge on the inner surface (11). The outlet portion (20b) comprises at least one outlet hole (25b) pneumatically connected to the outlet portion (22), the flow of the hot gas through the shell 10) after passing through the inner chamber (30) to the cavity (21) through the discharge holes (25b), the Yankee dryer cylinder (1). The Yankee dryer cylinder (1) is characterized in that it is adjusted to flow through the outlet (24) to the outside of the.   A plurality of distributor members (40) are provided and housed within the interior chamber (30), each of the plurality of distributor members (40) being the cavity (21 of the fixed hollow shaft (20) 2.) A distribution of the stream (100) of high-temperature gas supplied into the interior of the shell (10) is arranged to be distributed over respective defined portions (11) of the inner surface of the shell (10). Yankee dryer cylinder (1) as described.   At least one inlet opening (41), each of the plurality of distributor members (40) being cylindrical and facing at least one supply hole (25a); and the inner surface of the cylindrical shell (10) 11. Yankee dryer cylinder (1) according to claim 2, comprising at least one distribution opening (42) facing 11).   Said, i.e. each distribution opening (42) is accompanied by a distribution plate (45) with a plurality of distribution holes (46), on each portion (11) of the inner surface of said cylindrical shell (10) Yankee dryer cylinder (1) according to claim 3, wherein the distribution of the hot gas stream (100) is uniformly distributed.   By arranging the distributor members (40) at a predetermined distance from each other and arranging the distribution openings (42) at a predetermined distance from the inner surface (11) of the shell (10), The facing sides of two adjacent distributor members (40) delimit, in use, a space for passing a stream of hot gas which is directed towards the outlet (25b) to escape. The Yankee dryer cylinder (1) according to claim 2, wherein.   The supply portion (21a) is provided with a plurality of supply holes (25a), the discharge portion is provided with a plurality of discharge holes (25b), and the supply holes (25a) and the discharge holes (25b) are fixed. The Yankee dryer cylinder (1) according to any one of the preceding claims, which is positioned in different longitudinal rows on the hollow shaft (20).   The system according to claim 6, wherein each of the plurality of distributor members (40) extends in the radial direction of the cylindrical shell (10) and along the longitudinal direction of the Yankee cylinder (10). The Yankee dryer cylinder (10) according to any one of the preceding claims.   The Yankee dryer cylinder (1) according to any one of the preceding claims, wherein the inlet (23) and the outlet (24) are provided on the same side (20) of the fixed hollow shaft. .   9. Yankee dryer cylinder according to claim 8, characterized in that a closed wall (26) is provided at the end (20) of the fixed hollow shaft opposite the inlet (23) and the outlet (24). (1). The bulkhead (35) is:
A partition (35) arranged substantially orthogonal to the longitudinal axis (102) of the fixed hollow shaft (20);
A longitudinally disposed partition (35) of said fixed hollow shaft (20);
A partition (35) extending longitudinally along said fixed hollow shaft (20) and comprising a first part (35a) and a second part (35b) inclined by a predetermined angle (α) ),
The Yankee dryer cylinder (1) according to any one of the preceding claims, selected from the group of   11. The Yankee dryer cylinder (1) according to any one of the claims 10, wherein the flow of hot gas is a flow of a mixture of gases.   Yankee dryer cylinder (1) according to any one of the claims 11 to 15, wherein the flow of hot gas is a flow of hot air.   The Yankee dryer cylinder according to any one of claims 12 to 19, wherein the temperature of the hot gas stream is set between 250 ° C and 700 ° C, preferably between 300 ° C and 600 ° C. (1).   A suction device is provided and connected to the outlet portion (24) of the fixed hollow shaft (20), the suction device into the cavity (21) of the fixed hollow shaft (20) The Yankee dryer cylinder (1) according to any one of the preceding claims, arranged to aspirate the flow of the hot gas supplied through the inlet (23). The Yankee dryer cylinder (1) according to any one of the preceding claims, comprising an outer surface (12) on which said wet web (160) to be dried is loaded in use;
-In use, a drying hood (150) disposed on the opposite side (10) of the Yankee dryer cylinder with respect to the damp web (160), operating in cooperation with the Yankee dryer cylinder (1) A drying hood (150) arranged to cause drying (160) of said wet web;
A duct (180) arranged to pneumatically connect the drying hood (150) to the cavity (21) of the fixed hollow shaft (20), the drying hood (150) A duct (180) disposed inside the cavity (21) to supply a stream (100) of hot gas circulating inside the chamber;
An apparatus (200) for drying a wet web of paper (160), or similar product, comprising: Disposing a fixed hollow shaft having a cavity and a side provided with a plurality of holes arranged to connect said cavity to the external environment, said fixed hollow shaft being:
-An inlet adapted to pass the flow of hot air and to be supplied into the cavity;
-Providing an outlet for adjusting the flow of the high temperature air to flow through to the outside of the dryer cylinder;
A cylindrical shell having an inner surface and rotatably mounted about the fixed hollow shaft, wherein an inner chamber inner surface is defined between the inner surface of the cylindrical shell and the side of the hollow shaft Placing the shell in place;
Arranging a partition mounted in the cavity to divide the fixed hollow shaft into a supply part and a discharge part;
-Supplying a flow of hot air in the supply part, passing the flow of hot air from the cavity to the inner chamber through at least one supply hole provided in the supply part; Thereafter, the inner surface is applied, and thereafter, the discharge portion of the fixed hollow shaft is inserted through at least one discharge hole provided in the discharge portion, and thereafter, from the cylinder, the outlet portion And the hot air flow impinges on the inner surface of the shell and then passes from the inner chamber to the cavity through the exhaust holes, through the outlet to the outside of the Yankee dryer cylinder. Adjusting to make the
A method of drying a wet web of paper, or a similar product, characterized in that it comprises:

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