Multi-channel drying cylinder and channel assembly
By using the method of counter-movement of coolant and steam in the multi-channel drying cylinder, the temperature gradient problem is solved, the uniform drying of the wet paper web and the uniformity of the paper surface dryness are achieved, and the paper quality is improved.
Patent Information
- Application Number
- CN202422893664.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-11-26
AI Technical Summary
The air intake method of the existing multi-channel drying cylinder causes a large temperature gradient to form outside the entire drying cylinder, making it impossible to evenly dry the wet paper web, thus affecting the paper quality.
By adopting the method of coolant and steam moving in opposite directions and setting corresponding inlets and outlets in the steam channel and coolant channel, the flow rate and flow rate of steam and coolant are controlled to avoid the formation of temperature gradient and enhance the uniform drying function of the drying cylinder.
It achieves uniform drying of the wet paper web, improves the uniformity of dryness of the paper surface, and enhances the quality of paper.
Smart Images
Figure CN223343062U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of condensation heat transfer experimental measurement, and in particular to a multi-channel drying cylinder and a channel assembly. Background Art
[0002] In a traditional drying cylinder, there is only one large channel. Steam enters the drying cylinder channel and produces condensation water during the heat transfer process. Condensation water is the main obstacle to heat transfer. As the speed of the paper machine increases, the effective discharge of condensation water is an important guarantee for the normal operation of the paper machine drying section.
[0003] In order to solve this problem, a multi-channel drying cylinder was proposed. This multi-channel drying cylinder consists of a drying cylinder outer wall, a rectangular channel and a drying cylinder inner wall. The steam enters the small rectangular channel directly, increasing the heat exchange area of the drying cylinder. At the same time, the drying cylinder channel can be processed into a channel with a certain inclination angle, which is conducive to the discharge of condensed water and improves the paper drying efficiency.
[0004] During the study of the actual heat transfer capacity of multi-channel dryers, it was found that the existing air intake method of multi-channel dryers will cause a large temperature gradient to form outside the entire dryer, making it impossible to achieve the function of uniformly drying the wet paper web. At the same time, it will cause the dryness of the entire paper surface to be uneven, affecting the paper quality. Utility Model Content
[0005] The embodiments of the present application provide a multi-channel drying cylinder and a channel assembly to enhance the function of the drying cylinder in uniformly drying a wet paper web, while improving the uniformity of dryness of the entire paper surface and enhancing the quality of the paper.
[0006] A first aspect of an embodiment of the present application provides a multi-channel drying cylinder, comprising at least one pair of channel assemblies, wherein the channel assemblies include a steam channel and a coolant channel arranged side by side;
[0007] Steam outlets are provided at both ends of the steam channel, and at least one first steam inlet is provided in the middle area of the steam channel for introducing steam;
[0008] Both ends of the coolant channel are provided with coolant inlets for introducing coolant, and a middle area of the coolant channel is provided with at least one coolant outlet.
[0009] In an optional manner, at least one second steam inlet is further provided between the first steam inlet and the steam outlet.
[0010] In an optional manner, when there are multiple second steam inlets, the multiple second steam inlets on the same side of the first steam inlet are equidistantly arranged.
[0011] In an optional manner, when there are multiple first steam inlets in the same steam channel, the multiple first steam inlets are arranged at equal intervals.
[0012] In an optional manner, it includes a rotating main shaft, which is connected to two polygonal turntables, and a sliding groove is opened on the side of each side of the turntable;
[0013] The two channel assemblies in each pair of channel assemblies are arranged opposite to each other on the turntable, and both ends of the channel assemblies are connected to the slide groove.
[0014] In an optional manner, a support plate is provided between the two channel assemblies of each pair of channel assemblies;
[0015] The support plate is provided with a power supply device and an information collection device electrically connected to the power supply device.
[0016] In an optional embodiment, it further includes a base and a control system, wherein a motor and two fixed brackets are fixed on the base; the two ends of the rotating main shaft are respectively connected to the two fixed brackets, and the rotating main shaft is connected to the motor through a transmission system.
[0017] In an optional manner, slip rings are respectively provided at both ends of the rotating main shaft; the slip rings are used to set up pipelines connecting the steam outlet, the coolant inlet, the first steam inlet and the coolant outlet.
[0018] A second aspect of an embodiment of the present application provides a channel assembly, the channel assembly comprising a steam channel and a coolant channel arranged side by side;
[0019] Steam outlets are provided at both ends of the steam channel, and at least one first steam inlet is provided in the middle area of the steam channel for introducing steam;
[0020] Both ends of the coolant channel are provided with coolant inlets for introducing coolant, and a middle area of the coolant channel is provided with at least one coolant outlet.
[0021] The embodiments of the present application provide a multi-channel dryer and channel assembly, wherein the multi-channel dryer includes at least one pair of channel assemblies, each comprising a steam channel and a coolant channel arranged side by side; steam outlets are provided at both ends of the steam channel, and at least one first steam inlet is provided in the central region of the steam channel for admitting steam; coolant inlets are provided at both ends of the coolant channel for admitting coolant, and at least one coolant outlet is provided in the central region of the coolant channel. By applying the technical solutions provided in the embodiments of the present application, by using a method in which the coolant and steam move in opposite directions, a large temperature gradient can be avoided on the outside of the dryer, thereby enhancing the dryer's ability to uniformly dry the wet paper web, while also improving the uniformity of dryness across the entire paper surface and enhancing paper quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0023] Figure 1 This is a schematic diagram of the overall structure of a multi-channel drying cylinder of a channel assembly to be used in an embodiment of the present application;
[0024] Figure 2 A schematic structural diagram of the steam channel side of the channel assembly provided in an embodiment of the present application;
[0025] Figure 3 A schematic structural diagram of the coolant channel side of the channel assembly provided in an embodiment of the present application;
[0026] Figure 4 A schematic structural diagram of a channel assembly from a first perspective provided in an embodiment of the present application;
[0027] Figure 5 A schematic structural diagram of a channel assembly from a second perspective provided in an embodiment of the present application;
[0028] Figure 6 A schematic structural diagram of another embodiment of the steam channel side of the channel assembly provided in an embodiment of the present application.
[0029] In the picture:
[0030] 1-channel assembly, 11-steam channel, 111-first steam inlet, 112-steam outlet, 12-coolant channel, 121-coolant inlet, 122-coolant outlet, 113-second steam inlet, 13-transparent window, 14-cover, 2-rotating spindle, 21-turntable, 211-slide, 3-support plate, 4-base, 41-motor, 42-fixed bracket, 5-control system, 6-slip ring. DETAILED DESCRIPTION
[0031] An embodiment of the present application provides a multi-channel drying cylinder to solve the problem that the air intake method of the existing multi-channel drying cylinder will cause a large temperature gradient to be formed outside the entire drying cylinder, making it impossible to evenly dry the wet paper web, and at the same time causing the dryness of the entire paper surface to be uneven, affecting the paper quality.
[0032] The embodiment of the present application provides a multi-channel drying cylinder, comprising at least one pair of channel components 1, such as Figure 4 As shown, the channel assembly 1 includes a steam channel 11 and a coolant channel 12 arranged side by side. Figure 3As shown, the channel assembly 1 further includes a transparent window 13 and a cover plate 14, wherein the transparent window 13 on the steam channel 11 is fixed to the outer shell of the steam channel 11 through the metal cover plate 14 to enhance the sealing performance of the steam channel 11. The transparent window 13 can be set to multiple, for example, Figure 2 As shown, the transparent windows 13 in the embodiment of the present application are provided in two numbers.
[0033] It should be noted that the number of the steam channels 11 and the coolant channels 12 shown in the drawings of the embodiment of the present application is 3. Figure 4 Schematic diagram, each steam channel 11 or coolant channel 12 operates independently, that is, each steam channel 11 is provided with a steam outlet 112 and a first steam inlet 111 , and each coolant channel 12 is provided with a coolant inlet 121 and a coolant outlet 122 .
[0034] Among them, such as Figure 2 、 Figure 5 and Figure 6 As shown, steam outlets 112 are provided at both ends of the steam channel 11, and at least one first steam inlet 111 is provided in the middle area of the steam channel 11, that is, the first steam inlet 111 is provided in the middle position of the cover plate 14, and the steam outlets 112 are provided at both ends of the steam channel 11. In actual application, high-temperature steam enters the steam channel 11 from the first steam inlet 111 and is transmitted in the steam channel 11. After entering the steam channel 11, the steam flows from the area with higher pressure to the area with lower pressure, that is, is discharged from the steam outlets 112 at both ends of the steam channel 11. During the process of steam being transmitted from the first steam inlet 111 to the steam outlet 112, the temperature of the steam gradually decreases.
[0035] Among them, such as Figure 3 、 Figure 5 and Figure 6 As shown, coolant inlets 121 are provided at both ends of the coolant channel 12, and at least one coolant outlet 122 is provided in the middle area of the coolant channel 12. In actual application, the coolant enters from the coolant inlets 121 at both ends of the coolant channel 12, is transmitted in the coolant channel 12, and is discharged from the coolant outlet 122 in the middle area of the coolant channel 12. In the process of the coolant being transmitted from the coolant inlet 121 to the coolant inlet 121, the temperature of the coolant gradually increases.
[0036] By arranging the coolant outlet 122 at a position corresponding to the first steam inlet 111 and arranging the coolant inlet 121 at the steam outlet 112, the coolant and the steam move in opposite directions. In the steam channel 11, the steam temperature near the first steam inlet 111 is higher than the steam far from the first steam inlet, and the coolant temperature at the corresponding position is relatively higher (compared to the steam near the coolant inlet 121). In this way, the relative temperature difference between the steam temperature and the coolant temperature at this position falls within a certain range; compared with the steam near the first steam inlet 111, the steam temperature far from the first steam inlet 111 is lower, and the coolant temperature at the corresponding position is relatively lower (compared to the steam near the coolant inlet 121). In this way, the relative temperature difference between the steam temperature and the coolant temperature at this position falls within a certain range. By this method of the coolant and the steam moving in opposite directions, a large temperature gradient can be avoided from forming outside the entire drying cylinder, thereby enhancing the function of the drying cylinder to evenly dry the wet paper web, while improving the uniformity of the dryness of the entire paper surface and improving the paper quality.
[0037] It should be noted that, in actual application, in order to improve the temperature gradient of the drying cylinder in the extension direction of the channel assembly 1, it is necessary to reasonably control the flow rate and flow velocity of the steam and coolant. The specific values of the flow rate and flow velocity of the steam and coolant can be determined through simulation, or through multiple tests and repeated determinations. The determination of the specific values of the flow rate and flow velocity of the steam and coolant can be implemented by referring to the test or simulation mode in the existing method. This application aims to protect the layout of the steam channel 11 and the coolant channel 12, and the numerical determination of the flow rate and flow velocity of the steam and coolant will not be repeated here.
[0038] In order to improve the effect of improving the temperature gradient of the drying cylinder in the extension direction of the channel assembly 1, in some embodiments of the present application, as shown in FIG. Figure 6 As shown, at least one second steam inlet 113 is provided between the first steam inlet 111 and the steam outlet 112. It should be noted that the temperature and / or flow rate of the steam introduced into the second steam inlet 113 may be the same as the temperature and / or flow rate of the steam introduced into the first steam inlet 111, or may be unequal, for example, the temperature is equal but the flow rate is different, or the temperature is unequal but the flow rate is the same. The specific temperature and flow rate values may be determined according to the actual design parameters, or may be determined by simulation or experiment based on the volume size of the drying cylinder.
[0039] Wherein, when the number of the second steam inlets 113 is set to multiple, the multiple second steam inlets 113 on the same side of the first steam inlet 111 are equidistantly arranged, that is, the multiple second steam inlets 113 between the first steam inlet 111 and the steam outlet 112 on one side are equidistantly arranged. Wherein, the number of the second steam inlets 113 is generally set to an even number, and the even number of first steam inlets 113 are evenly distributed on both sides of the first steam inlet 111. For example, the number of the second steam inlets 113 is set to two. In this case, the two second steam inlets 113 are respectively on both sides of the first steam inlet 111, and the distances from the second steam inlet 113 on either side to the first steam inlet 111 and the steam outlet 112 are equal. For another example, the number of the second steam inlets 113 is set to four. In this case, the four second steam inlets 113 are respectively on both sides of the first steam inlet 111, and the two second steam inlets 113 on either side, as well as the four components formed by the first steam inlet 111 and the steam outlet 112 are equidistantly arranged.
[0040] It should be noted that in the embodiment of the present application, the number of first steam inlets 111 of the same steam channel 11 can be set to multiple. When the number of first steam inlets 111 is multiple, the multiple first steam inlets 111 are equidistantly arranged. Of course, if the number of second steam inlets 113 is two, at this time, the two second steam inlets 113 are evenly arranged in the middle area of the steam channel 11, wherein the specific range of the middle area of the steam channel 11 can be determined according to the specific size of the channel assembly 1, for example, the length of the middle area is 1 / 10 of the overall length of the steam channel 11, and the center of symmetry of the middle area coincides with the center of symmetry of the steam channel 11.
[0041] It should be noted that when a plurality of first steam inlets 111 are provided, the plurality of first steam inlets 111 are relatively concentrated in the middle area of the steam channel 11 and do not extend a long distance to both ends of the steam channel 11 .
[0042] It should be noted that, when there are multiple first steam inlets 111 , the distance between the second steam inlet 113 and the first steam inlet 111 is calculated as the distance between the second steam inlet 113 and the nearest first steam inlet 111 .
[0043] like Figure 1 As shown, in some embodiments of the present application, the multi-channel drying cylinder includes a rotating main shaft 2, to which two polygonal turntables 21 are connected, and a slide groove 211 is provided on the side of each side of the turntable 21; the two channel assemblies 1 in each pair of channel assemblies 1 are relatively arranged on the turntable 21, and the two ends of the channel assembly 1 are connected to the slide groove 211, that is, the two channel assemblies 1 are symmetrical about the rotating main shaft 2, so that during the rotation of the rotating main shaft 2, the dynamic balance of the entire rotating component can be guaranteed.
[0044] The inclination angle of the channel assembly 1 can be adjusted by adjusting the connection between the channel assembly 1 and the slide groove 211. For example, the channel assembly 1 is connected to the slide groove 211 through bolts. When adjusting the inclination angle of the channel assembly 1, the bolts at both ends of the channel assembly 1 are loosened or removed, and then the position of the bolts in the slide groove 211 is adjusted, and then the bolts are tightened to fix the channel assembly 1 in the slide groove 211.
[0045] In order to ensure the stability of the multi-channel drying cylinder, such as Figure 1 As shown, a support plate 3 is provided between the two channel assemblies 1 of each pair of channel assemblies 1; in this way, during the rotation of the multi-channel drying cylinder, the connection of the support plate 3 can be used to improve the rotation stability of each pair of channel assemblies 1. It should be noted that the connection between the support plate 3 and the channel assembly 1 is adjustable, so as to avoid the connection method between the support plate 3 and the channel assembly 1 interfering with the angle adjustment of the channel assembly 1 when adjusting the inclination angle of the channel assembly 1.
[0046] In addition, a power supply device and an information collection device electrically connected to the power supply device are provided on the support plate 3 to provide power to necessary devices on the channel assembly and to collect necessary data through the information collection device.
[0047] like Figure 1 As shown, the multi-channel drying cylinder also includes a base 4 and a control system 5. A motor 61 and two fixed brackets 42 are fixed on the base 4; the two ends of the rotating main shaft 2 are respectively connected to the two fixed brackets 42, and the rotating main shaft 2 is connected to the motor 61 through a transmission system.
[0048] Among them, Figure 1 As shown, slip rings 6 are respectively provided at both ends of the rotating main shaft 2 ; the slip rings 6 are used to set up pipelines connecting the steam outlet 112 and the coolant inlet 121 , the first steam inlet 111 and the coolant outlet 122 .
[0049] The slip ring 6 can be a Senring slip ring, which is resistant to steam temperatures of 150°C and pressures of 0.5 MPa. Multiple pipes are provided to achieve connectivity between steam, coolant, and circuits. The stator end of the slip ring is fixed to the fixed bracket 42 via a stopper sheet metal. The purpose of the stopper sheet metal is to prevent the stator end of the slip ring from rotating with the rotating main shaft 2 and damaging the metal bellows. The working principle is as follows: the stopper sheet metal is fixed to the fixed bracket 42 of the experimental table via two sets of bolts. A third set of bolts then passes through the threaded holes on the upper end face and into the threaded holes on the stator end of the slip ring. At the same time, the rotor end of the slip ring is fixed to the rotating main shaft 2 via screws, allowing the rotor end of the slip ring to rotate synchronously with the rotating main shaft 2.
[0050] A second aspect of an embodiment of the present application provides a channel assembly 1, which includes a steam channel 11 and a coolant channel 12 arranged side by side; steam outlets 112 are provided at both ends of the steam channel 11, and at least one first steam inlet 111 is provided in the middle area of the steam channel 11 to allow steam to pass through; coolant inlets 121 are provided at both ends of the coolant channel 12 to allow coolant to pass through, and at least one coolant outlet 122 is provided in the middle area of the coolant channel 12.
[0051] The embodiments of the present application provide a multi-channel drying cylinder and channel assembly, wherein the multi-channel drying cylinder includes at least one pair of channel assemblies 1, wherein the channel assembly 1 includes a steam channel 11 and a coolant channel 12 arranged side by side; steam outlets 112 are provided at both ends of the steam channel 11, and at least one first steam inlet 111 is provided in the middle region of the steam channel 11 for admitting steam; coolant inlets 121 are provided at both ends of the coolant channel 12 for admitting coolant, and at least one coolant outlet 122 is provided in the middle region of the coolant channel 12. By applying the technical solutions provided in the embodiments of the present application, the coolant and steam move in opposite directions, thereby avoiding the formation of a large temperature gradient outside the entire drying cylinder, thereby enhancing the dryer's ability to uniformly dry the wet paper web, while also improving the uniformity of dryness across the entire paper surface and enhancing paper quality.
[0052] It should be noted that the above embodiments illustrate rather than limit the invention, and that alternative embodiments may be devised by a person skilled in the art without departing from the scope of the appended claims. In the claims, any reference signs placed between brackets should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising several different elements and by means of appropriately programmed computers. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names. The steps in the above embodiments should not be understood as limiting the order of execution unless otherwise specified.
Claims
1. A multi-channel drying cylinder, characterized in that: The invention comprises at least one pair of channel assemblies (1), wherein the channel assembly (1) comprises a steam channel (11) and a coolant channel (12) arranged side by side; Steam outlets (112) are provided at both ends of the steam channel (11), and at least one first steam inlet (111) is provided in the middle area of the steam channel (11) for introducing steam; Coolant inlets (121) are provided at both ends of the coolant channel (12) for introducing coolant, and at least one coolant outlet (122) is provided in the middle area of the coolant channel (12).
2. The multi-channel drying cylinder according to claim 1, characterized in that: At least one second steam inlet (113) is further provided between the first steam inlet (111) and the steam outlet (112).
3. The multi-channel drying cylinder according to claim 2, characterized in that: When there are multiple second steam inlets (113), the multiple second steam inlets (113) on the same side of the first steam inlet (111) are arranged at equal distances.
4. The multi-channel drying cylinder according to claim 1, characterized in that: When the number of the first steam inlets (111) in the same steam channel (11) is plural, the plurality of first steam inlets (111) are arranged at equal distances.
5. The multi-channel drying cylinder according to claim 1, characterized in that: The invention comprises a rotating main shaft (2), two polygonal turntables (21) are connected to the rotating main shaft (2), and a sliding groove (211) is formed on the side of each side of the turntable (21); The two channel assemblies (1) in each pair of channel assemblies (1) are arranged opposite to each other on the turntable (21), and both ends of the channel assemblies (1) are connected to the slide groove (211).
6. The multi-channel drying cylinder according to claim 1, characterized in that: A support plate (3) is provided between the two channel assemblies (1) of each pair of channel assemblies (1); The support plate (3) is provided with a power supply device and an information collection device electrically connected to the power supply device.
7. The multi-channel drying cylinder according to claim 5, characterized in that: The invention also comprises a base (4) and a control system (5); a motor (41) and two fixed brackets (42) are fixed on the base (4); two ends of the rotating main shaft (2) are respectively connected to the two fixed brackets (42); and the rotating main shaft (2) is connected to the motor (41) through a transmission system.
8. The multi-channel drying cylinder according to claim 5, characterized in that: Slip rings (6) are respectively provided at both ends of the rotating main shaft (2); the slip rings (6) are used to set up pipelines connecting the steam outlet (112), the coolant inlet (121), the first steam inlet (111) and the coolant outlet (122).
9. A channel assembly (1), characterized in that The channel assembly (1) includes a steam channel (11) and a coolant channel (12) arranged side by side; Steam outlets (112) are provided at both ends of the steam channel (11), and at least one first steam inlet (111) is provided in the middle area of the steam channel (11) for introducing steam; Coolant inlets (121) are provided at both ends of the coolant channel (12) for introducing coolant, and at least one coolant outlet (122) is provided in the middle area of the coolant channel (12).