Drying cylinder for papermaking and drying method thereof

Abstract

The invention belongs to the technical field of papermaking equipment, and particularly relates to a drying cylinder for papermaking and a drying method thereof. An air supply component covers the outer portion of the drying cylinder, a heat collecting channel is formed between the air supply component and the drying cylinder and communicated with the air supply component, the air supply component supplies hot air into the heat collecting channel, the hot air moves towards a collecting part after entering the heat collecting channel, and the collecting part is fixedly arranged at the end of one side of the air supply component. The collecting part is connected with the heat recovery part through a first pipeline, the heat recovery part carries out heat exchange reaction on heat gas input by the first pipeline, and the heat recovery part introduces cooling water which is heated after heat exchange into the steam generation part through a second pipeline; the steam generating part converts the cooling water which is heated after heat exchange into steam, and the steam is introduced into the drying cylinder through a third pipeline; heat energy in the system is more effectively recycled, and the technological process of the whole papermaking production system is optimized.

Description

Technical Field

[0001] The invention belongs to the technical field of papermaking equipment, and in particular relates to a drying cylinder for papermaking and a drying method thereof. Background Art

[0002] The papermaking drying cylinder is a component in the papermaking machinery used to continuously dry the paper blanks after pulp is formed. It is a drum-type pressure vessel with rotatable shafts set on the heads at both ends. Steam is introduced through the inner hole of the hollow shaft at one end. There is also a water bucket in the cylinder to send condensed water to the hollow shaft at the other end for discharge. The drying cylinder consumes a lot of steam and other energy to generate heat in the process of drying paper. If this heat is not recycled, it will be directly discharged into the environment, resulting in a huge waste of energy. Summary of the invention

[0003] The purpose of the present invention is to provide a papermaking drying cylinder and a drying method thereof in response to the above-mentioned technical problems, and the connection arrangement of the drying cylinder, air supply components, collection components, heat recovery components and steam generating components, so that the heat energy in the system is recycled more effectively, and the process flow of the entire papermaking production system is optimized, from heat collection, to heat exchange between cooling water and gas, and then to the reuse of cooling water after heat exchange to generate steam, forming a relatively complete energy circulation system, thereby improving the system's integration and operating efficiency.

[0004] In view of this, the present invention provides a papermaking drying cylinder, including a drying cylinder, an outer cover of the drying cylinder is provided with an air supply component, a heat collecting channel is formed between the air supply component and the drying cylinder, the heat collecting channel and the air supply component are connected, the air supply component supplies hot air into the heat collecting channel, the hot air enters the heat collecting channel and moves toward a collecting part, the collecting part is fixedly arranged at one side end of the air supply component, the collecting part is connected to a heat recovery component through a first pipe, the heat recovery component performs a heat exchange reaction on the heat gas input by the first pipe, the heat recovery component passes the cooling water heated after the heat exchange into the steam generating component through the second pipe, the steam generating component converts the cooling water heated after the heat exchange into steam and passes it into the drying cylinder through a third pipe.

[0005] In the present technical solution, an air supply component is arranged outside the drying cylinder, and together with the drying cylinder, a heat collection channel is formed. The arrangement of the air supply component can prevent heat from dissipating and supply hot air to the heat collection channel. On the one hand, it can cooperate with the drying cylinder to achieve a better drying effect on the paper sheets. On the other hand, the hot air can drive the heat in the heat collection channel to move to the collection part. The collection part, as a heat convergence point, is fixedly arranged at one end of the air supply component and connected to the heat recovery component through a first pipe. The heat recovery component performs a heat exchange reaction on the hot gas, and passes the cooling water heated by the heat exchange into the steam generating part through a second pipe. By recycling the waste heat of the cooling water, the heating amount originally required for the steam generating part can be reduced, thereby reducing energy consumption and operating costs. The connection arrangement of the drying cylinder, the air supply component, the collecting component, the heat recovery component and the steam generating component enables the heat energy in the system to be recycled more effectively, optimizes the process flow of the entire papermaking production system, and forms a relatively complete energy circulation system from heat collection, to heat exchange between cooling water and gas, and then to reuse of cooling water after heat exchange to generate steam, thereby improving the integration and operating efficiency of the system.

[0006] In the above technical solution, further, the air supply component includes an air induced air hood body arranged on the outside of the drying cylinder, a heat collection channel is formed between the air induced air hood body and the drying cylinder, the air induced air hood body is provided with a plurality of air outlets in an array along the circumference of the drying cylinder toward the bottom side of the drying cylinder, and an air outlet unit is provided at the air outlet.

[0007] In the above technical solution, further, the air outlet unit includes an air outlet shell embedded in the air outlet, an air outlet chamber is arranged in the air outlet shell, the air outlet chamber is connected to an air supply duct, the air supply duct is connected to an external hot air source, and an air outlet channel is arranged through the air outlet shell, and the air outlet channel connects the air outlet chamber and the heat recovery channel.

[0008] In the present technical solution, the air outlet is arranged along the length direction of the air hood, and the air outlet channel of the air outlet unit is a narrow and long opening arranged along the length direction of the air outlet. Furthermore, an air outlet unit is independently connected to the air supply duct and the external hot air source. When a problem occurs in a single air outlet unit, it will not affect the working effect of the present device.

[0009] In the above technical solution, further, the air outlet direction of the air outlet channel is opposite to the tangent of the drying cylinder rotation direction.

[0010] In the present technical solution, the direction of the air outlet channel is arranged so as to maximize the momentum when the hot air collides with the paper, so as to increase the force between the hot air and the paper, thereby increasing the efficiency of drying the paper.

[0011] In the above technical solution, further, the collecting part includes a collecting trough arranged at the paper feeding end of the drying cylinder, a collecting chamber is opened in the trough, the collecting chamber is connected to the heat recovery component through a first pipe, and the collecting trough is opened with a first opening connected to the collecting chamber, and the direction of the first opening is tangent to the heat collection channel.

[0012] In this technical solution, the hot air ejected by the air supply component can drive the heat in the heat collection channel to move toward the collection part. The direction of the first opening is tangent to the heat collection channel, which can ensure that the hot air enters the collection chamber more fully to complete the collection.

[0013] In the above technical solution, further, the heat recovery component includes a fixed shell, at least one group of heat exchange components is arranged in the fixed shell, the heat exchange component includes an outer shell fixedly arranged in the fixed shell, a heat exchange chamber for flowing cooling liquid is arranged in the outer shell, the heat exchange chamber is connected with a liquid inlet pipe and a liquid outlet pipe, the liquid inlet pipe is connected to an external cooling liquid supply device, a heat exchange tube group for recovering hot air to pass through is arranged in the outer shell, the heat exchange tube group is connected to the first pipe and the second pipe, and the second pipe is connected to the steam generating component.

[0014] In the present technical solution, multiple groups of heat exchange components can be arranged in the fixed shell and connected in parallel through pipes to increase the recovery efficiency of the heat recovery components, at least one group. The liquid inlet pipe is connected to the bottom side of the heat exchange chamber, and the liquid outlet pipe is connected to the upper side of the heat exchange chamber. When the coolant enters from the bottom, the coolant will gradually fill the chamber under the action of gravity, and fully contact the heat exchange tube group in the chamber to exchange heat. As the temperature of the coolant increases, the density decreases, and it will float to the upper part of the chamber and flow out from the liquid outlet pipe. Such a flow process makes the flow of the coolant in the chamber more orderly and sufficient, which can maximize the use of the heat exchange area and improve the heat exchange efficiency.

[0015] In the above technical solution, further, the heat exchange tube group includes a first frame and a second frame, and the first frame and the second frame are respectively fixedly arranged on both sides of the heat exchange chamber, and the first frame and the second frame are both hollow structures. The first frame and the second frame are connected by a plurality of heat exchange pipes, the first frame is connected to the air intake pipe, and the second frame is connected to the exhaust channel.

[0016] In the above technical solution, further, the outer walls of the first frame and the second frame are circumferentially provided with connecting blocks connected to the inner wall of the shell, and the connecting blocks, the shell and the frame constitute a flow channel for the coolant to pass through.

[0017] In the above technical solution, further, the outer wall of the heat exchange pipe is provided with heat dissipation fins in an array along the length direction of the heat exchange pipe, and a plurality of heat dissipation holes are penetrated through the heat dissipation fins.

[0018] In this technical solution, the addition of heat dissipation fins greatly expands the contact area between the cooling water and the pipe, so that heat can be transferred from the pipe to the cooling water more effectively. The presence of heat dissipation holes further promotes the flow of cooling water, allowing it to penetrate deeper between the heat dissipation fins, forming a stronger convection heat exchange, thereby effectively taking away the heat in the pipe and improving the overall heat exchange efficiency.

[0019] Also included is a drying method for the above-mentioned papermaking drying cylinder, comprising the following steps:

[0020] S1: The air supply component supplies hot air into the heat collection channel. The moving direction of the hot air in the heat collection channel is opposite to the paper sheet conveying direction. The hot air cooperates with the drying cylinder to act on the passing paper sheets to improve the paper sheet drying effect.

[0021] S2: The hot air ejected by the air supply component can drive the heat in the heat collection channel to move to the collection portion fixedly arranged at one end of the air supply component, and enter the heat exchange chamber through the first opening, and the direction of the first opening is tangent to the heat collection channel;

[0022] S3: The hot gas enters the heat recovery component through the first pipeline, and the hot gas is fully heat-exchanged through the heat exchange tube group and the coolant flowing in the heat exchange chamber;

[0023] S4: The cooling liquid heated by heat exchange enters the steam generating component through the second pipe for steam generation, and the steam generated by the steam generating component enters the drying cylinder through the third pipe for paper sheet drying.

[0024] Among them, the above steps are carried out simultaneously to form a relatively complete energy circulation system, which improves the system's integration and operation efficiency.

[0025] The beneficial effects of the present invention are:

[0026] 1. The hot air blown out by the air supply component can drive the heat in the heat collection channel to move to the collection part. The collection part is fixedly arranged at one end of the air supply component as a heat gathering point, and is connected to the heat recovery component through the first pipeline. The heat recovery component performs a heat exchange reaction on the hot gas, and passes the cooling water heated by the heat exchange into the steam generating part through the second pipeline. By recycling the waste heat of the cooling water, the heating amount originally required by the steam generating part can be reduced, thereby reducing energy consumption and operating costs. The connection arrangement of the drying cylinder, the air supply component, the collection component, the heat recovery component and the steam generating component enables the heat energy in the system to be recycled more effectively, and optimizes the process flow of the entire papermaking production system. From heat collection, to heat exchange between cooling water and gas, and then to the reuse of cooling water after heat exchange to generate steam, a relatively complete energy circulation system is formed, which improves the integration and operating efficiency of the system;

[0027] 2. By arranging an air supply component outside the drying cylinder and forming a heat collection channel together with the drying cylinder, the air supply component can prevent heat from dissipating and supply hot air to the heat collection channel, which can cooperate with the drying cylinder to achieve a better drying effect on the paper sheets. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the air supply component;

[0030] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0031] Figure 4 is a schematic diagram of the structure of the heat recovery component;

[0032] Figure 5 It is a schematic diagram of the internal structure of the heat exchange component;

[0033] Figure 6 yes Figure 5 Sectional view at AA in the middle;

[0034] Figure 7 It is a schematic diagram of the structure of the heat sink fin.

[0035] The symbols in the figure are:

[0036] 1. Drying cylinder; 2. Air supply component; 3. Heat collecting channel; 4. Collecting part; 5. First pipeline; 6. Heat recovery component; 7. Second pipeline; 8. Steam generating component; 9. Third pipeline; 10. Paper sheet; 11. Air hood; 12. Air outlet; 13. Air outlet unit; 14. Air outlet shell; 15. Air outlet chamber; 16. Air supply pipeline; 17. Air outlet channel; 18. Collecting tank; 19. Collecting chamber; 20. First opening; 21. Fixed shell; 22. Heat exchange component; 23. Shell; 24. Heat exchange chamber; 25. Liquid inlet pipeline; 26. Liquid outlet pipeline; 27. Heat exchange tube group; 28. First frame; 29. ​​Second frame; 30. Heat exchange pipeline; 31. Air inlet pipeline; 32. Exhaust channel; 33. Connecting block; 34. Flow channel; 35. Heat dissipation fins. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0038] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0040] It should be noted that, in the description of the present application, the orientation or positional relationship indicated by terms such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise stated, these orientation words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application; the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

[0041] It should be noted that, in the present application, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0042] First embodiment:

[0043] like Figure 1-7 As shown, this embodiment provides a papermaking drying cylinder, including a drying cylinder 1, an outer cover of the drying cylinder 1 is provided with an air supply component 2, a heat collecting channel 3 is formed between the air supply component 2 and the drying cylinder 1, the heat collecting channel 3 and the air supply component 2 are connected, the air supply component 2 supplies hot air into the heat collecting channel 3, and the hot air moves toward the collecting part 4 after entering the heat collecting channel 3. The collecting part 4 is fixedly arranged at one side end of the air supply component 2, the collecting part 4 is connected to the heat recovery component 6 through the first pipe 5, the heat recovery component 6 performs a heat exchange reaction on the heat gas input by the first pipe 5, the heat recovery component 6 passes the cooling water heated after the heat exchange into the steam generating component 8 through the second pipe 7, and the steam generating component 8 converts the cooling water heated after the heat exchange into steam and passes it into the drying cylinder 1 through the third pipe 9.

[0044] By arranging an air supply component 2 outside the drying cylinder 1 and forming a heat collection channel 3 together with the drying cylinder 1, the arrangement of the air supply component 2 can prevent the heat from dissipating and supply hot air to the heat collection channel 3. On the one hand, it can cooperate with the drying cylinder 1 to achieve a better drying effect on the paper sheets 10. On the other hand, the hot air can drive the heat in the heat collection channel 3 to move to the collection part 4. The collection part 4 is fixedly arranged at one side end of the air supply component 2 as a heat gathering point, and is connected to the heat recovery component 6 through the first pipe 5. The heat recovery component 6 performs a heat exchange reaction on the hot gas to heat the cooling water after the heat exchange. The steam generating part is introduced through the second pipe 7. By recycling the waste heat of the cooling water, the heating amount originally required by the steam generating part 8 can be reduced, thereby reducing energy consumption and operating costs. The connection arrangement of the drying cylinder 1, the air supply part 2, the collecting part 4, the heat recovery part 6 and the steam generating part 8 enables the heat energy in the system to be recycled more effectively, thereby optimizing the process flow of the entire papermaking production system. From heat collection, to heat exchange between cooling water and gas, to recycling the cooling water after heat exchange to generate steam, a relatively complete energy circulation system is formed, which improves the system integration and operating efficiency.

[0045] The steam generating component 8 can be a steam generator in the prior art, which heats water to make it evaporate rapidly into steam. The steam generator has the advantages of fast start-up, high efficiency, energy saving and environmental protection, etc., which will not be described in detail.

[0046] like Figure 2 As shown, the air supply component 2 includes an air induced air hood 11 which is arranged outside the drying cylinder 1, a heat collecting channel 3 is formed between the air induced air hood 11 and the drying cylinder 1, a plurality of air outlets 12 are arranged in an array along the circumference of the drying cylinder 1 on the bottom side of the drying cylinder 1, and an air outlet unit 13 is arranged at the air outlet 12.

[0047] The air outlet unit 13 includes an air outlet shell 14 embedded in the air outlet 12, an air outlet chamber 15 is arranged in the air outlet shell 14, the air outlet chamber 15 is connected to an air supply duct 16, the air supply duct 16 is connected to an external hot air source, and an air outlet channel 17 is arranged through the air outlet shell 14, and the air outlet channel 17 connects the air outlet chamber 15 and the heat recovery channel.

[0048] like Figure 2 and Figure 3 As shown, the air outlet 12 is arranged along the length direction of the air duct 11, and the air outlet channel 17 of the air outlet unit 13 is a narrow and long passage arranged along the length direction of the air outlet 12. Furthermore, an air outlet unit 13 is independently connected to the air supply duct 16 and the external hot air source. When a problem occurs in a single air outlet unit 13, it will not affect the working effect of the device.

[0049] The outlet direction of the air outlet channel 17 is opposite to the tangent of the rotation direction of the drying cylinder 1. The direction of the air outlet channel 17 is set in this way to maximize the momentum when the hot air collides with the paper, so as to increase the force between the hot air and the paper, thereby increasing the efficiency of drying the paper.

[0050] The collecting part 4 includes a collecting trough 18 arranged at the paper feeding end of the drying cylinder 1, a collecting chamber 19 is opened in the trough, the collecting chamber 19 is connected to the heat recovery component 6 through a first pipe 5, and the collecting trough 18 is opened with a first opening 20 connected to the collecting chamber 19, and the direction of the first opening 20 is tangent to the heat collection channel 3.

[0051] The hot air ejected from the air supply component 2 can drive the heat in the heat collection channel 3 to move toward the collection portion 4. The first opening 20 is tangent to the heat collection channel 3, which can ensure that the hot air fully enters the collection chamber 19 to complete the collection.

[0052] A filtering device is provided in the collecting part 4 or between the collecting part 4 and the heat recovery component 6 to filter the paper scraps that may be brought out, and an existing filtering device can be used.

[0053] like Figure 4-Figure 6 As shown, the heat recovery component 6 includes a fixed shell 21, in which at least one group of heat exchange components 22 is arranged, and the heat exchange component 22 includes an outer shell 23 fixedly arranged in the fixed shell 21, and a heat exchange chamber 24 for flowing cooling liquid is arranged in the outer shell 23, and the heat exchange chamber 24 is connected with a liquid inlet pipe 25 and a liquid outlet pipe 26, and the liquid inlet pipe 25 is connected to an external cooling liquid supply device, and a heat exchange tube group 27 for the recovered hot air to pass through is arranged in the outer shell 23, and the heat exchange tube group 27 is connected to the first pipe 5 and the second pipe 7, and the second pipe 7 is connected to the steam generating component 8.

[0054] Multiple groups of heat exchange components 22 can be arranged in the fixed shell 21, which are connected in parallel through pipes to increase the recovery efficiency of the heat recovery component 6, at least one group. The liquid inlet pipe 25 is connected to the bottom side of the heat exchange chamber 24, and the liquid outlet pipe 26 is connected to the upper side of the heat exchange chamber 24. When the coolant enters from the bottom, the coolant will gradually fill the chamber under the action of gravity, and fully contact with the heat exchange tube group 27 in the chamber to exchange heat. As the temperature of the coolant increases, the density decreases, and it will float to the upper part of the chamber and flow out from the liquid outlet pipe 26. Such a flow process makes the flow of the coolant in the chamber more orderly and sufficient, which can maximize the use of the heat exchange area and improve the heat exchange efficiency.

[0055] like Figure 5 and Figure 6As shown, the heat exchange tube group 27 includes a first frame 28 and a second frame 29, which are respectively fixedly arranged on both sides of the heat exchange chamber 24, and the first frame 28 and the second frame 29 are both hollow structures. The first frame 28 and the second frame 29 are connected by a plurality of heat exchange pipes 30, the first frame 28 is connected to the intake pipe 31, and the second frame 29 is connected to the exhaust channel 32.

[0056] The bottom of the second frame 29 is a conical structure, which is convenient for discharging condensate generated by the heat exchange reaction. The discharge channel 32 can be connected to a gas-water separator, such as a cyclone cyclone separator, a baffle separator, etc.

[0057] The valve bodies installed on the connecting pipes in this application are not shown. The specific valve body selection and installation are conventional installation methods in the prior art and will not be elaborated on.

[0058] The outer walls of the first frame 28 and the second frame 29 are both circumferentially provided with connecting blocks 33 connected to the inner wall of the outer shell 23 . The connecting blocks 33 , the outer shell 23 and the frame form a flow channel 34 for the coolant to pass through.

[0059] like Figure 7 As shown, the outer wall of the heat exchange pipe 30 is provided with heat dissipation fins 35 in an array along the length direction of the heat exchange pipe 30 , and a plurality of heat dissipation holes are penetrated through the heat dissipation fins 35 .

[0060] The addition of the heat dissipation fins 35 greatly expands the contact area between the cooling water and the pipe, so that heat can be more effectively transferred from the pipe to the cooling water. The presence of the heat dissipation holes further promotes the flow of cooling water, allowing it to penetrate deeper between the heat dissipation fins 35, forming a stronger convection heat exchange, thereby effectively removing the heat in the pipe and improving the overall heat exchange efficiency.

[0061] The heat recovery component 6 in the present application can be replaced by other common heat exchange devices in the prior art.

[0062] Also included is a drying method for the above-mentioned papermaking drying cylinder, comprising the following steps:

[0063] S1: The air supply component 2 supplies hot air to the heat collection channel 3. The moving direction of the hot air in the heat collection channel 3 is opposite to the conveying direction of the paper sheet 10. The hot air cooperates with the drying cylinder 1 to act on the passing paper sheet 10, thereby improving the drying effect of the paper sheet 10.

[0064] S2: The hot air ejected from the air supply component 2 can drive the heat in the heat collection channel 3 to move to the collection portion 4 fixedly disposed on one end of the air supply component 2, and enter the heat exchange chamber 24 through the first opening 20, the direction of the first opening 20 being tangential to the heat collection channel 3;

[0065] S3: The hot gas enters the heat recovery component 6 through the first pipe 5, and the hot gas is fully heat-exchanged through the heat exchange tube group 27 and the coolant flowing in the heat exchange chamber 24;

[0066] S4: The cooling liquid heated by heat exchange enters the steam generating component 8 through the second pipe 7 for steam generation. The steam generated by the steam generating component 8 enters the drying cylinder 1 through the third pipe 9 for drying the paper sheet 10.

[0067] Among them, the above steps are carried out simultaneously to form a relatively complete energy circulation system, which improves the system's integration and operation efficiency.

[0068] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A drying cylinder for papermaking, comprising a drying cylinder (1), characterized in that: The drying cylinder (1) is provided with an air supply component (2) on the outside, a heat collection channel (3) is formed between the air supply component (2) and the drying cylinder (1), the heat collection channel (3) and the air supply component (2) are connected, the air supply component (2) supplies hot air into the heat collection channel (3), the hot air moves toward the collection part (4) after entering the heat collection channel (3), the collection part (4) is fixedly arranged at one end of the air supply component (2), the collection part (4) is connected to the heat recovery component (6) through a first pipe (5), the heat recovery component (6) performs a heat exchange reaction on the heat gas input from the first pipe (5), the heat recovery component (6) passes the cooling water heated after the heat exchange into the steam generating component (8) through a second pipe (7), the steam generating component (8) converts the cooling water heated after the heat exchange into steam and passes it into the drying cylinder (1) through a third pipe (9).

2. The papermaking drying cylinder according to claim 1, characterized in that: The air supply component (2) comprises an air bleed hood (11) which is arranged outside the drying cylinder (1); a heat collection channel (3) is formed between the air bleed hood (11) and the drying cylinder (1); the air bleed hood (11) is provided with a plurality of air outlets (12) arranged in an array along the circumference of the drying cylinder (1) on the bottom side of the drying cylinder (1); and an air outlet unit (13) is provided at the air outlet (12).

3. The papermaking drying cylinder according to claim 2, characterized in that: The air outlet unit (13) comprises an air outlet shell (14) embedded in the air outlet (12); an air outlet chamber (15) is arranged in the air outlet shell (14); the air outlet chamber (15) is connected to an air supply duct (16); the air supply duct (16) is connected to an external hot air source; an air outlet channel (17) is arranged through the air outlet shell (14); the air outlet channel (17) is connected to the air outlet chamber (15) and the heat recovery channel.

4. The papermaking drying cylinder according to claim 3, characterized in that: The air outlet direction of the air outlet channel (17) is opposite to the tangent of the rotation direction of the drying cylinder (1).

5. The papermaking drying cylinder according to claim 1, characterized in that: The collecting part (4) comprises a collecting groove (18) arranged at the paper feeding end of the drying cylinder (1), a collecting chamber (19) being provided in the groove, the collecting chamber (19) being connected to the heat recovery component (6) via a first pipe (5), the collecting groove (18) being provided with a first opening (20) connected to the collecting chamber (19), the direction of the first opening (20) being tangent to the heat collecting channel (3).

6. The papermaking drying cylinder according to claim 1, characterized in that: The heat recovery component (6) comprises a fixed shell (21), at least one group of heat exchange components (22) is arranged in the fixed shell (21), the heat exchange component (22) comprises an outer shell (23) fixedly arranged in the fixed shell (21), a heat exchange chamber (24) for flowing cooling liquid is arranged in the outer shell (23), the heat exchange chamber (24) is connected with a liquid inlet pipe (25) and a liquid outlet pipe (26), the liquid inlet pipe (25) is connected to an external cooling liquid supply device, a heat exchange pipe group (27) for the recovered hot air to pass through is arranged in the outer shell (23), the heat exchange pipe group (27) is connected to the first pipe (5) and the second pipe (7), and the second pipe (7) is connected to the steam generating component (8).

7. The papermaking drying cylinder according to claim 6, characterized in that: The heat exchange tube group (27) comprises a first frame (28) and a second frame (29), the first frame (28) and the second frame (29) being fixedly arranged on both sides of the heat exchange chamber (24), respectively, the first frame (28) and the second frame (29) both being hollow structures, the first frame (28) and the second frame (29) being connected via a plurality of heat exchange pipes (30), the first frame (28) being connected to an intake pipe (31), and the second frame (29) being connected to an exhaust channel (32).

8. The papermaking drying cylinder according to claim 7, characterized in that: The outer walls of the first frame (28) and the second frame (29) are both circumferentially provided with connection blocks (33) connected to the inner wall of the outer shell (23); the connection blocks (33), the outer shell (23) and the frame form a flow channel (34) for the coolant to pass through.

9. The papermaking drying cylinder according to claim 7, characterized in that: The outer wall of the heat exchange pipe (30) is provided with heat dissipation fins (35) in an array along the length direction of the heat exchange pipe (30), and a plurality of heat dissipation holes are provided through the heat dissipation fins (35).

10. A drying method for a papermaking drying cylinder according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: The air supply component (2) supplies hot air into the heat collection channel (3); the moving direction of the hot air in the heat collection channel (3) is opposite to the conveying direction of the paper sheet (10), and the hot air cooperates with the drying cylinder (1) to act on the passing paper sheet (10), thereby improving the drying effect of the paper sheet (10); S2: The hot air ejected from the air supply component (2) can drive the heat in the heat collection channel (3) to move toward the collection portion (4) fixedly arranged at one end of the air supply component (2), and enter the heat exchange chamber (24) through the first opening (20), and the direction of the first opening (20) is tangent to the heat collection channel (3); S3: The hot gas enters the heat recovery component (6) through the first pipe (5), and the hot gas is fully heat-exchanged through the heat exchange tube group (27) and the coolant flowing in the heat exchange chamber (24); S4: The cooling liquid heated by heat exchange enters the steam generating component (8) through the second pipe (7) for steam generation. The steam generated by the steam generating component (8) is passed through the third pipe (9) into the drying cylinder (1) for drying the paper sheet (10).

Images