Heat supply system for drying part of raw paper machine

Abstract

The invention discloses a raw paper machine drying part heat supply system which comprises a shell, a gas distribution cylinder, a hollow shaft, a steam connector, a condensate water connector and a bearing, the hollow shaft is rotationally connected with the bearing, the steam connector and the condensate water connector are arranged at the ends of the hollow shaft respectively, and the gas distribution cylinder is arranged in a cavity between the shell and the hollow shaft. A plurality of first through holes and second through holes are formed in the side wall of the air distribution cylinder in a staggered mode, an inner sleeve is arranged on the inner side wall of each second through hole, a 0.2-1.5 mm channel is formed by the inner sleeve and the inner wall of each second through hole, the air distribution cylinder and the inner sleeve are made of hydrophilic materials, the inner sleeve is provided with a strip-shaped through hole penetrating through the side wall of the inner sleeve, and the strip-shaped through holes are communicated with the air distribution cylinder. A steam distributing pipe and a condensate water collecting pipe are arranged on the inner side of the steam distributing cylinder, the steam distributing pipe is communicated with the first through hole and the steam connector, and the condensate water collecting pipe is communicated with the second through hole and the condensate water connector. Condensate water is prevented from blocking the through holes, steam flowing is promoted, and the heat transfer effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of base paper drying, and particularly to a heat supply system for the drying section of a base paper machine. Background Art

[0002] The drying section of a base paper machine is a mechanical component in papermaking machinery used to continuously dry the paper blank after pulp forming. It is a hollow cylinder made of cast iron with covers at both ends, also known as a dryer cylinder. By introducing steam inside, the heat of the steam is used to evaporate the moisture in the paper, achieving the drying of the paper. In order to achieve uniform distribution of steam in the dryer cylinder, a plurality of small channels are provided inside the dryer cylinder. The steam flows through these channels and releases heat and condenses, making the flow of steam in the dryer cylinder more uniform. However, the small channels are easily blocked by condensate. Although the condensate can also be discharged from the channels under the action of air pressure, the flow resistance of the blocked small channels increases, and the steam will pass through the channels with less resistance, resulting in uneven distribution of steam inside the dryer cylinder and affecting the flow and heat transfer effect of the steam. Summary of the Invention

[0003] Aiming at the above-mentioned prior art, the present invention provides a heat supply system for the drying section of a base paper machine, which prevents condensate from blocking the through holes, makes the distribution of steam inside the dryer cylinder more uniform, promotes the flow of steam and improves the heat transfer effect.

[0004] To achieve the above object, the technical solution of the embodiment of the present invention is realized as follows:

[0005] A heat supply system for the drying section of a base paper machine includes a steam joint, a hollow shaft, a housing, a siphon tube, a condensate joint and a bearing. The hollow shaft is rotatably connected to the bearing. The ends of the hollow shaft are respectively provided with the steam joint and the condensate joint. The condensate joint is communicated with the siphon tube. A gas distribution cylinder is arranged in the cavity between the housing and the hollow shaft. The side wall of the gas distribution cylinder is provided with a plurality of first through holes and second through holes. The first through holes and the second through holes are arranged alternately. The diameters of the first through holes and the second through holes are 2 - 8 mm. An inner sleeve is arranged on the inner side wall of the second through hole. A channel with a width of 0.2 - 1.5 mm is formed between the inner sleeve and the inner wall of the second through hole. The gas distribution cylinder and the inner sleeve are made of hydrophilic materials. The inner sleeve is provided with strip-shaped through holes penetrating through its side wall. A steam distribution pipe and a condensate collection pipe are arranged inside the gas distribution cylinder. The steam distribution pipe communicates the first through holes and the steam joint. The condensate collection pipe communicates the second through holes and the condensate joint.

[0006] Further, an isolation groove is arranged at one end of the second through hole close to the side wall of the housing. The isolation groove is communicated with the strip-shaped through hole.

[0007] Furthermore, a mesh cylinder is sleeved outside the inner sleeve. A plurality of diversion channels are formed on the side wall of the mesh cylinder. The diversion channels are formed by connecting a plurality of diversion units in series. Each diversion unit includes a bifurcated channel and a meandering channel. The meandering channel connects the upper end of the bifurcated channel. The upper end refers to the end close to the outer shell, and the lower end refers to the end close to the hollow shaft. The bifurcated channels of adjacent diversion units are connected in series in sequence.

[0008] Furthermore, support rods are arranged on the outer side wall of the central cylinder, and the support rods are connected to the air distribution cylinder.

[0009] Furthermore, the support rods are arranged at intervals along the circumferential direction of the central cylinder.

[0010] Furthermore, a clamping groove is arranged at the end of the shell, and the end of the air distribution cylinder is embedded in the clamping groove.

[0011] Furthermore, the steam joint is communicated with the inner cavity of the hollow shaft, and the steam distribution pipe is communicated with the inner cavity of the hollow shaft.

[0012] Furthermore, a connecting rod is arranged inside the air distribution cylinder, and the connecting rod is connected to the support rod.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. A number of first through holes and second through holes are arranged on the air distribution cylinder. Steam enters through the first through holes and contacts the inner wall of the outer shell. The outer shell is heated by high-temperature steam. The steam after heat exchange is discharged from the second through holes. The first through holes and the second through holes are arranged alternately. Therefore, the high-temperature steam is evenly distributed on the outer shell body. The diameters of the first through holes and the second through holes are 2-8 mm. A smaller diameter can set a large number of first through holes and second through holes, making the high-temperature steam evenly distributed.

[0015] 2. An inner sleeve is arranged in the second through hole, and a channel with a size of 0.2-1.5 mm is formed between the inner sleeve and the inner wall of the second through hole. The air distribution cylinder and the inner sleeve are made of hydrophilic materials. The inner sleeve is provided with strip-shaped through holes penetrating its side wall. There is an attractive force between the liquid molecules condensed in the second through hole and the solid wall molecules. This attractive force causes the condensed liquid to enter the 0.2-1.5 mm channel along the strip-shaped through holes on the side wall and diffuse along the 0.2-1.5 mm channel, which can prevent the liquid from gathering and blocking the second through hole. The liquid flowing along the 0.2-1.5 mm channel finally enters the condensate collection pipe. Since the second through hole is not easily blocked by the condensed liquid, the second through holes in different parts can effectively pass through the steam, which can make the steam evenly distributed, promote the flow of steam and improve the heat transfer effect. Description of the Drawings

[0016] Figure 1 This is a schematic cross-sectional view of a heating system for the drying section of a base paper machine according to an embodiment of the present application;

[0017] Figure 2 For this application Figure 1 A schematic diagram of the structure of the middle A area;

[0018] Figure 3 This is a schematic structural diagram of a heating system for the drying section of a base paper machine in an embodiment of the present application;

[0019] Figure 4 This is a structural diagram of the net drum in the embodiment of the present application;

[0020] Figure 5 This is a schematic diagram of the flow of condensed water in the guide channel in an embodiment of the present application;

[0021] Figure 6 This is a schematic diagram of the flow of condensed water in the guide channel in an embodiment of the present application;

[0022] Description of Figure Numbers:

[0023] 1. Shell; 2. Air distribution cylinder; 3. Hollow shaft; 4. Steam joint; 5. Condensate joint; 6. Bearing; 7. First through hole; 8. Second through hole; 9. Inner sleeve; 10. Strip through hole; 11. Steam air distribution pipe; 12. Condensate collection pipe; 13. Isolation groove; 14. Mesh cylinder; 15. Bifurcation channel; 16. Circuitous channel; 17. Support rod; 18. Slot; 19. Connecting rod. DETAILED DESCRIPTION

[0024] The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in the present invention description are for the purpose of describing specific embodiments only and are not intended to limit the present invention.

[0025] It should also be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0026] Example 1

[0027] Please refer to the attached Figures 1 to 2, the present application provides a heat supply system for the drying section of a base paper machine, including a steam joint 4, a hollow shaft 3, a housing 1, a siphon tube, a condensate joint 5, and a bearing 6. The hollow shaft 3 is rotatably connected to the bearing 6. The end portions of the hollow shaft 3 are respectively provided with the steam joint 4 and the condensate joint 5. The steam joint 4 is communicated with the inner cavity of the hollow shaft 3, and the condensate joint 5 is communicated with the siphon tube. A gas distribution cylinder 2 is arranged in the cavity between the housing 1 and the hollow shaft 3. The side wall of the gas distribution cylinder 2 is provided with a plurality of first through holes 7 and second through holes 8. The first through holes 7 and the second through holes 8 are arranged alternately. The diameters of the first through holes 7 and the second through holes 8 are 2-8 mm. The inner side wall of the second through hole 8 is provided with an inner sleeve 9. The inner sleeve 9 and the inner wall of the second through hole 8 form a channel with a width of 0.2-1.5 mm. The gas distribution cylinder 2 and the inner sleeve 9 are made of hydrophilic materials. The inner sleeve 9 is provided with strip-shaped through holes 10 penetrating through its side wall. A steam distribution pipe 11 and a condensate collection pipe 12 are arranged in the gas distribution cylinder 2. The steam distribution pipe 11 communicates the first through holes 7 and the steam joint 4, and the condensate collection pipe 12 communicates the second through holes 8 and the condensate joint 5.

[0028] High-temperature steam enters through the steam joint and flows along the steam distribution pipe into the first through-hole 7. Along with the first through-hole 7, it enters the area between the air distribution cylinder 2 and the outer housing 1, heating the outer housing 1. As the outer housing contacts the base paper, the base paper is dried. Subsequently, the steam enters the condensate collection pipe 12 along the second through-hole 8 and flows to the condensate joint 5 along the condensate collection pipe 12, thereby discharging the condensate. After heat exchange, the temperature of the high-temperature steam decreases, and part of the water vapor condenses to form cooling water. The cooling water flows to the condensate collection pipe 12, and the condensate collection pipe 12 is connected to an external drain pipe through the condensate joint 5. When the drain pipe is filled with condensate, a siphon effect can be formed, thereby siphoning and discharging the condensate in the condensate collection pipe 12. A number of first through-holes 7 and second through-holes 8 are provided on the air distribution cylinder 2. The steam enters through the first through-hole 7 and contacts the inner wall of the outer housing, heating the outer housing with the high-temperature steam. The steam after heat exchange is discharged from the second through-hole 8. The first through-holes 7 and the second through-holes 8 are arranged alternately, so the high-temperature steam is evenly distributed on the outer housing 1. The diameters of the first through-holes 7 and the second through-holes 8 are 2 - 8 mm. A smaller diameter allows a large number of first through-holes 7 and second through-holes 8 to be provided, making the high-temperature steam evenly distributed. An inner sleeve 9 is provided in the second through-hole 8, and a channel with a width of 0.2 - 1.5 mm is formed between the inner sleeve 9 and the inner wall of the second through-hole 8. The air distribution cylinder 2 and the inner sleeve 9 are made of hydrophilic materials. The inner sleeve 9 is provided with strip-shaped through-holes 10 penetrating its side wall. There is an attractive force between the liquid molecules condensed in the second through-hole and the solid wall molecules. This attractive force causes the condensate to enter the 0.2 - 1.5 mm channel along the strip-shaped through-holes 10 on the side wall and diffuse along the 0.2 - 1.5 mm channel, preventing liquid accumulation from blocking the second through-hole 8. The liquid flowing along the 0.2 - 1.5 mm channel finally enters the condensate collection pipe 12 and is finally discharged. Since the second through-hole is not easily blocked by the condensate, the second through-holes in different positions can effectively pass through the steam, enabling the steam to be evenly distributed, promoting the flow of the steam and improving the heat transfer effect. The steam joint 4 can ensure the stable supply of high-temperature steam when the outer housing rotates, and the condensate joint 5 can ensure the discharge of condensate when the outer housing rotates.

[0029] Specifically, an isolation groove 13 is provided at one end of the second through hole 8 close to the side wall of the housing 1, and the isolation groove 13 communicates with the strip-shaped through hole 10. When the condensed water diffuses along the strip-shaped through hole 10 and the 0.2 - 1.5 mm channel to the isolation groove 13, it is intercepted to prevent the condensed water from flowing back into the air distribution cylinder 2 and the area of the outer shell diameter. As the outer shell rotates, even if condensed water accumulates in the second through hole 8 at the bottom, the accumulated condensed water accumulates at the isolation groove 13, blocking the channel in the second through hole 8 at the bottom, so that more air flows through the first through hole 7 and the second through hole 8 above to dry the base paper above.

[0030] Embodiment 2

[0031] Please refer to the attached Figures 1 to 6 , the difference between this embodiment and Embodiment 1 is that a mesh cylinder 14 is sleeved outside the inner sleeve 9, and a plurality of diversion channels are formed on the side wall of the mesh cylinder 14. The diversion channels are formed by connecting a plurality of diversion units in series. The diversion unit includes a bifurcated channel 15 and a meandering channel 16. The meandering channel 16 connects the upper end of the bifurcated channel 15. The upper end refers to the end close to the outer shell, and the lower end refers to the end close to the hollow shaft 3. The bifurcated channels 15 of adjacent diversion units are connected in series in sequence. The upper end of the bifurcated channel 15 is an arc-shaped channel, which is slightly curved. At the lower end of the arc-shaped channel, it bifurcates into two channels, and the two channels are connected by the meandering channel 16. The middle part of the meandering channel 16 is bent upward into a circular arc. When the condensed water flows from the upper end to the lower end, the water flow gathers from the two bifurcated channels to the arc-shaped channel, and the resistance of the water flow is small. When the condensed water flows from the lower end to the upper end, the condensed water flows from the arc-shaped channel to the two bifurcated channels. Part of the condensed water gathers with another bifurcated channel 15 after passing through the meandering part. The flowing direction of the water flow flowing back from the meandering part is different from the original flowing direction of the bifurcated channel 15, so that the flow of the condensed water at the gathering place is blocked, preventing the water flow from flowing upward. Prevent too much condensed water from flowing into the isolation groove 13, resulting in the overflow of condensed water to the area between the air distribution cylinder 2 and the outer shell.

[0032] Embodiment 3

[0033] Please refer to the attached Figures 1 to 6 , the difference between this embodiment and Embodiment 1 is that a support rod 17 is provided on the outer side wall of the central cylinder, and the support rod 17 is connected to the air distribution cylinder 2. One end of the support rod 17 is fixed to the outside of the central cylinder by bolts, and the other end is fixed to the inner wall of the air distribution cylinder 2 by bolts. The support rod 17 is used to fix the air distribution cylinder 2, improving the stability of the air distribution cylinder 2.

[0034] Specifically, the support rods 17 are arranged at intervals along the circumferential direction of the central cylinder. Arranging the support rods 17 at equal intervals along the circumferential direction can stabilize the air distribution cylinder 2 from multiple angles and improve the stability.

[0035] Specifically, a clamping groove 18 is provided at the end of the housing 1, and the end of the air distribution cylinder 2 is embedded in the clamping groove 18. The air distribution cylinder 2 is fixed by using the clamping groove 18, improving the stability of the air distribution cylinder 2.

[0036] Specifically, the steam joint 4 communicates with the inner cavity of the hollow shaft 3, and the steam distribution pipe 11 communicates with the inner cavity of the hollow shaft 3, so as to realize the communication between the steam distribution pipe 11 and the steam joint 4. During operation, high-temperature steam enters the inner cavity of the hollow shaft 3 and then enters each steam distribution pipe 11 from the inner cavity of the hollow shaft 3. The inner diameter of the inner cavity of the hollow shaft 3 is much larger than the inner diameter of the rotating steam distribution pipe 11, which can make the steam enter each steam distribution pipe 11 more evenly.

[0037] Specifically, a connecting rod 19 is provided inside the air distribution cylinder 2, and the connecting rod 19 is connected to the support rod 17. The support rod 17 is connected by the connecting rod 19, improving the stability of the support rod 17.

[0038] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered within the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A heat supply system for the drying section of a base paper machine, characterized in that, It includes a housing, an air distribution cylinder, a hollow shaft, a steam joint, a condensate joint and a bearing. The hollow shaft is rotatably connected to the bearing. The steam joint and the condensate joint are respectively provided at the end portions of the hollow shaft. A cavity between the housing and the hollow shaft is provided with the air distribution cylinder. The side wall of the air distribution cylinder is provided with a plurality of first through holes and second through holes, and the first through holes and the second through holes are arranged alternately. The diameters of the first through holes and the second through holes are 2 to 8 mm. An inner sleeve is provided on the inner side wall of the second through hole, and a channel with a width of 0.2 to 1.5 mm is formed between the inner sleeve and the inner wall of the second through hole. The air distribution cylinder and the inner sleeve are made of hydrophilic materials. The inner sleeve is provided with strip-shaped through holes penetrating through its side wall. A steam distribution pipe and a condensate collection pipe are provided inside the air distribution cylinder. The steam distribution pipe communicates with the first through holes and the steam joint, and the condensate collection pipe communicates with the second through holes and the condensate joint.

2. The heat supply system for the drying section of the base paper machine according to claim 1, characterized in that, An isolation groove is provided at one end of the second through hole close to the side wall of the housing, and the isolation groove communicates with the strip-shaped through hole.

3. The heat supply system for the drying section of the base paper machine according to claim 1, characterized in that A mesh cylinder is sleeved outside the inner sleeve. A plurality of diversion channels are formed on the side wall of the mesh cylinder. The diversion channels are formed by connecting a plurality of diversion units in series. Each diversion unit includes a bifurcated channel and a meandering channel, and the meandering channel connects the upper ends of the bifurcated channel. The bifurcated channels of adjacent diversion units are connected in series in sequence.

4. The heat supply system for the drying section of the base paper machine according to claim 1, characterized in that, Support rods are provided on the outer side wall of the central cylinder, and the support rods are connected to the air distribution cylinder.

5. The heat supply system for the drying section of a base paper machine according to claim 1, characterized in that, The support rods are arranged at intervals along the circumferential direction of the central cylinder.

6. The heat supply system for the drying section of the base paper machine according to claim 1, characterized in that, A clamping groove is provided at the end of the housing, and the end of the air distribution cylinder is embedded in the clamping groove.

7. The heat supply system for the drying section of the base paper machine according to claim 1, characterized in that, The steam joint communicates with the inner cavity of the hollow shaft, and the steam distribution pipe communicates with the inner cavity of the hollow shaft.

8. A heat supply system for the drying section of a base paper machine according to claim 1, characterized in that Connecting rods are provided inside the air distribution cylinder, and the connecting rods are connected to the support rods.

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