Efficient drying device of papermaking drying part
By designing a multi-cylinder continuous drying structure and heat pump system in the papermaking process, waste heat exhausted steam and hot steam are passed into the low-temperature drying cylinder block, the problem that the drying device cannot utilize waste heat exhausted steam is solved and the thermal energy utilization rate is improved and drying efficiency reduces drying time and environmental pollution.
Patent Information
- Application Number
- CN202420551672.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-03-21
AI Technical Summary
The existing papermaking process drying devices cannot effectively utilize the waste heat and steam at low pressure and low temperature, resulting in low thermal energy utilization and frequent water accumulation in the drying cylinder.
An efficient drying device including multiple drying cylinder groups arranged side by side is designed. The drying cylinder groups are divided into low-temperature, medium-temperature and high-temperature sections. The waste heat exhaust steam and hot steam are passed into the low-temperature section drying cylinder block through a heat pump, and the use of multiple The cylinder block continuously drying structure and sealed cavity are combined with the exhaust fan to absorb high-temperature, humid and hot air, improving thermal energy utilization and drying efficiency.
The effective utilization of waste heat exhausted steam is achieved, the utilization rate of heat energy is improved, the drying time is reduced, the workshop and the environment is protected, and the air flow rate is accelerated, and the drying efficiency of forming paper is improved.
Smart Images
Figure CN222205869U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of papermaking process devices, in particular to a high-efficiency drying device in a papermaking drying section. Background Art
[0002] As an energy and resource intensive industry, the papermaking industry generates a large amount of waste heat and exhaust steam during the entire production process. Most of the waste heat and exhaust steam generated are low-quality waste heat with low pressure and low temperature, which is difficult to recycle.
[0003] Modern medium and high-speed paper machines usually use two types of steam supply systems for the drying cylinders in the drying section: one is a traditional heat pump steam supply system that adds a heat pump to each section of the drying cylinder, and the other is a traditional heat pump steam supply and multi-section steam supply mixed steam supply system that only adds a traditional heat pump to the low-temperature section of the drying cylinder. Both of these steam supply systems have problems such as insufficient inlet and outlet pressure in the low-temperature section of the drying cylinder, resulting in water accumulation in the drying cylinder, and cannot utilize a large amount of waste heat and exhaust steam. Utility Model Content
[0004] The utility model provides a high-efficiency drying device for a papermaking drying section, which can solve the technical problem that the drying device of the existing papermaking process cannot utilize waste heat and exhaust steam.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-efficiency drying device for a papermaking drying section, comprising a closed cavity, a drying cylinder group arranged transversely inside the closed cavity, the drying cylinder group comprising a plurality of drying cylinder bodies arranged side by side, a drying net arranged for winding and conveying between the drying cylinder bodies, an air inlet and an air outlet respectively arranged at both ends of the drying cylinder body, a heat pump arranged at the air inlet, and the drying cylinder group is divided into a low-temperature section, a medium-temperature section and a high-temperature section in the paper feeding direction, wherein The air outlet on the drying cylinder body in the high temperature section is connected with the air inlet on the drying cylinder body in the medium temperature section, the air outlet on the drying cylinder body in the medium temperature section is connected with the air inlet in the low temperature section, the heat pumps on the drying cylinder bodies in the medium temperature section and the high temperature section are connected with superheated steam, and the heat pump on the drying cylinder body in the low temperature section is connected with waste heat and exhaust steam generated by the papermaking process. By passing the waste heat and exhaust steam into the drying cylinder body in the low temperature section, effective utilization of the waste heat and exhaust steam can be achieved. Using a heat pump to pass hot steam and waste heat and exhaust steam into the drying cylinder body can improve the utilization rate of thermal energy.
[0006] Preferably, the drying cylinder group comprises an upper drying cylinder group and a lower drying cylinder group, and the drying cylinder bodies in the upper drying cylinder group and the lower drying cylinder group are arranged in an up-and-down staggered manner, which can reasonably utilize the space and allow the drying device to fully dry the paper.
[0007] Preferably, guide rollers are correspondingly arranged on the sides of the drying cylinder bodies, and the dryer mesh transmitted between the drying cylinder bodies passes over the guide rollers to adjust the papermaking angle of the contact section between the dryer mesh and the drying cylinder bodies, which is flexible and reliable.
[0008] Preferably, a drainage outlet is installed at the bottom of the drying cylinder body, mainly for discharging condensed water formed after the steam exchanges heat with the cylinder body.
[0009] Preferably, a support rod is provided at the inner center position of the drying cylinder body, and at least two movable guide plates are provided on the support rod along the radial direction of the drying cylinder body. The movable guide plates rotate around the support rod, and the angle between the movable guide plates corresponds to the papermaking angle. The area enclosed by the movable guide plates and the drying cylinder body is the heat source fluid injection area. The additional injection area can maximize the use of the heat source to heat and dry the formed paper.
[0010] Preferably, the papermaking angle is °, and the adjustment range is relatively large.
[0011] Preferably, the air outlet of the drying cylinder body of the upper row of drying cylinder groups is on the same side as the air inlet of the drying cylinder body of the lower row of drying cylinder groups, and the air inlet of the drying cylinder body of the upper row of drying cylinder groups is on the same side as the air outlet of the drying cylinder body of the lower row of drying cylinder groups, in order to ensure the stability of air flow velocity and pressure in the closed cavity.
[0012] Preferably, the heat pump adopts a Laval nozzle structure.
[0013] Preferably, a purge nozzle is installed at least at one end of the drying cylinder body, and the purge nozzle faces the interior of the drying cylinder body. The purge nozzle can regularly purge and clean the inner surface of the drying cylinder.
[0014] Preferably, the enclosed cavity is a enclosed hood system, an exhaust fan is installed on the outside of which, and the high-temperature hot and humid air in the enclosed cavity can be sucked away by the exhaust fan.
[0015] Compared with the prior art, the beneficial effects of the utility model are:
[0016] A multi-cylinder continuous drying structure is adopted, and the drying cylinder group is divided into three temperature sections: high, medium and low. The waste heat and exhaust steam can be effectively utilized by passing the waste heat and exhaust steam into the drying cylinder body in the low temperature section. The use of a heat pump to pass hot steam and waste heat and exhaust steam into the drying cylinder body can improve the thermal energy utilization rate. The drying cylinder group is set in a closed cavity, and an exhaust fan is used to suck the high-temperature hot and humid air in the air hood. This not only protects the workshop and the atmospheric environment, but also concentrates the high-temperature hot and humid air, recycles the heat energy in the high-temperature hot and humid steam, and can also speed up the air flow speed and improve the drying efficiency of the formed paper. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is an overall schematic diagram of the utility model;
[0018] Figure 2 This is the pipeline gas supply diagram of the thermal drying system of the utility model;
[0019] Figure 3 This is a schematic diagram of the installation of various components of the thermal drying system of the utility model.
[0020] Reference numerals:
[0021] 1. Drying cylinder body, 1-1. Upper drying cylinder group, 1-2. Lower drying cylinder group, 1-3. Movable guide plate, 2. Swirl blade, 3. Heat pump, 4. Purge nozzle, 5. Drainage and sewage outlet, 6. Guide roller, 7. Support rod, 8. Exhaust fan, 9. Drying net. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.
[0023] like Figure 1-3 As shown, the utility model is provided to solve the technical problem that the drying device of the existing papermaking process cannot utilize waste heat and exhaust steam. The utility model provides the following technical solutions: a high-efficiency drying device for a papermaking drying section, comprising a closed cavity, a drying cylinder group arranged transversely inside the closed cavity, the drying cylinder group comprising a plurality of drying cylinder bodies 1 arranged side by side, a dry net 9 is arranged between the drying cylinder bodies 1 for winding and conveying, an air inlet and an air outlet are respectively arranged at both ends of the drying cylinder body 1, a heat pump 3 is arranged at the air inlet, and the drying cylinder group is divided into a low-temperature section, a medium-temperature section and a high-temperature section in the paper feeding direction, wherein the air outlet on the drying cylinder body 1 in the high-temperature section is connected to the air inlet on the drying cylinder body 1 in the medium-temperature section, and the air outlet on the drying cylinder body 1 in the medium-temperature section is connected to the air inlet on the drying cylinder body 1 in the medium-temperature section. The air port is connected with the air inlet of the low temperature section, the heat pump 3 on the drying cylinder body 1 of the medium temperature section and the high temperature section is connected with the superheated steam, and the heat pump 3 on the drying cylinder body 1 in the low temperature section is connected with the waste heat and exhaust steam generated by the papermaking process. By passing the waste heat and exhaust steam into the drying cylinder body 1 of the low temperature section, the waste heat and exhaust steam can be effectively utilized. The use of the heat pump 3 to pass the hot steam and the waste heat and exhaust steam into the drying cylinder body 1 can improve the utilization rate of thermal energy. The heat pump 3 can adopt a Laval nozzle structure. After the steam and the waste heat and exhaust steam in the steam pipeline and the waste heat and exhaust steam pipeline enter the heat pump 3, after passing through the diffusion chamber of the heat pump 3, the kinetic energy of the hot fluid is converted into thermal energy, and after being sprayed into the drying cylinder body 1, it has a higher temperature and a lower flow rate, which can fully transfer the heat to the formed paper on the dryer network 9.
[0024] Specifically, the drying cylinder body 1 in the high temperature section is completely filled with superheated steam, so the temperature in the high temperature section is the highest, and the relatively wet formed paper can be dried quickly. The moist hot steam discharged from the high temperature section still has a relatively high temperature and can continue to be used, so it is passed into the drying cylinder body 1 in the medium temperature section, and superheated steam is added to the medium temperature section at the same time, and the formed paper passing through can also be dried at a higher temperature. In order to utilize the waste heat and exhaust steam in the low temperature section, the waste heat and exhaust steam are combined with the moist hot steam discharged from the medium temperature section for heating, thereby solving the problem of utilizing the waste heat and exhaust steam.
[0025] The closed cavity can adopt a closed hood system, and an exhaust fan 8 is installed on the outside of the closed cavity. The high-temperature hot and humid air in the closed cavity can be sucked away by the exhaust fan 8. This can not only protect the workshop and the atmospheric environment, but also concentrate the high-temperature hot and humid air, recycle the heat energy in the high-temperature hot and humid steam, and speed up the air flow speed to improve the drying efficiency of the formed paper.
[0026] In this embodiment, the drying cylinder group includes an upper drying cylinder group 1-1 and a lower drying cylinder group 1-2. The drying cylinder bodies 1 in the upper drying cylinder group 1-1 and the lower drying cylinder group 1-2 are staggered in an up-down manner, which can reasonably utilize the space so that the drying device can fully dry the paper. From a local point of view, the drying cylinder bodies 1 of the upper drying cylinder group 1-1 and the lower drying cylinder group 1-2 can be staggered in an equilateral triangle.
[0027] Among them, the air outlet of the drying cylinder body 1 of the upper row drying cylinder group 1-1 and the air inlet of the drying cylinder body 1 of the lower row drying cylinder group 1-2 are on the same side, and the air inlet of the drying cylinder body 1 of the upper row drying cylinder group 1-1 and the air outlet of the drying cylinder body 1 of the lower row drying cylinder group 1-2 are on the same side, in order to ensure the stability of the air flow velocity and pressure in the closed cavity.
[0028] In addition, if Figure 3 As shown, a drainage outlet 5 is installed at the bottom of the drying cylinder body 1, which is mainly used to discharge condensed water formed after the heat exchange between the steam and the cylinder body. At the same time, a purge nozzle 4 is installed at at least one end of the drying cylinder body 1. The purge nozzle 4 faces the inside of the drying cylinder body 1. The purge nozzle 4 can regularly purge and clean the inner surface of the drying cylinder.
[0029] In order to facilitate the transmission of formed paper between the drying cylinder bodies 1, the side of the drying cylinder body 1 is correspondingly provided with a guide roller 6, and the guide roller 6 can be raised and lowered to adjust the position. The dry net 9 transmitted between the drying cylinder bodies 1 passes over the guide roller 6 to adjust the papermaking angle of the contact section between the dry net 9 and the drying cylinder body 1, which is flexible and reliable. The papermaking angle adjustment angle is 60-180°, and the adjustment range is relatively large.
[0030] In order to maximize the use of heat source energy, a support rod 7 is provided at the inner center of the drying cylinder body 1. At least two movable guide plates 1-3 are provided on the support rod 7 along the radial direction of the drying cylinder body 1. The movable guide plates 1-3 rotate around the support rod 7. The angle between the movable guide plates 1-3 corresponds to the papermaking angle. The area surrounded by the movable guide plates 1-3 and the drying cylinder body 1 is the heat source fluid injection area. The angle between the guide plates should be consistent with the papermaking angle. For formed paper, the heat transfer area is only the area where the paper sheet contacts the surface of the drying cylinder. Adding an injection area can maximize the use of the heat source to heat and dry the formed paper.
[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0032] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0033] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0034] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
Claims
1. A high-efficiency drying device for a papermaking drying section, characterized in that: The invention comprises a closed cavity, a drying cylinder group arranged transversely inside the closed cavity, the drying cylinder group comprising a plurality of drying cylinder bodies (1) arranged side by side, a dry net (9) being arranged between the drying cylinder bodies (1) for conveying, an air inlet and an air outlet being arranged at both ends of the drying cylinder body (1), a heat pump (3) being arranged at the air inlet, the drying cylinder group being divided into a low-temperature section, a medium-temperature section and a high-temperature section in the paper feeding direction, wherein the air outlet on the drying cylinder body (1) in the high-temperature section is connected to the air inlet on the drying cylinder body (1) in the medium-temperature section, the air outlet on the drying cylinder body (1) in the medium-temperature section is connected to the air inlet in the low-temperature section, the heat pumps (3) on the drying cylinder bodies (1) in the medium-temperature section and the high-temperature section are connected to superheated steam, and the heat pump (3) on the drying cylinder body (1) in the low-temperature section is connected to waste heat and exhaust steam generated by the papermaking process.
2. The high-efficiency drying device of the papermaking drying section according to claim 1 is characterized in that: The drying cylinder group comprises an upper drying cylinder group (1-1) and a lower drying cylinder group (1-2), and the drying cylinder bodies (1) in the upper drying cylinder group (1-1) and the lower drying cylinder group (1-2) are arranged in an up-down staggered manner.
3. The high-efficiency drying device of the papermaking drying section according to claim 1 or 2, characterized in that: The side of the drying cylinder (1) is provided with a guide roller (6) correspondingly, and the dryer mesh (9) transmitted between the drying cylinders (1) passes around the guide roller (6) to adjust the papermaking angle of the contact section between the dryer mesh (9) and the drying cylinder (1).
4. The high-efficiency drying device of the papermaking drying section according to claim 3 is characterized in that: A drainage and sewage outlet (5) is installed at the bottom of the drying cylinder body (1).
5. The high-efficiency drying device of the papermaking drying section according to claim 4 is characterized in that: A support rod (7) is arranged at the inner center position of the drying cylinder body (1), and at least two movable guide plates (1-3) are arranged on the support rod (7) along the radial direction of the drying cylinder body (1). The movable guide plates (1-3) rotate around the support rod (7), and the angle between the movable guide plates (1-3) corresponds to the papermaking angle.
6. The high-efficiency drying device of the papermaking drying section according to claim 5, characterized in that: The papermaking angle is 60-180°.
7. The high-efficiency drying device of the papermaking drying section according to claim 2, characterized in that: The air outlet of the drying cylinder body (1) of the upper drying cylinder group (1-1) and the air inlet of the drying cylinder body (1) of the lower drying cylinder group (1-2) are on the same side, and the air inlet of the drying cylinder body (1) of the upper drying cylinder group (1-1) and the air outlet of the drying cylinder body (1) of the lower drying cylinder group (1-2) are on the same side.
8. The high-efficiency drying device of the papermaking drying section according to claim 1, characterized in that: The heat pump (3) adopts a Laval nozzle structure.
9. The high-efficiency drying device of the papermaking drying section according to claim 1, characterized in that: A purge nozzle (4) is installed on at least one end of the drying cylinder body (1), and the purge nozzle (4) faces the interior of the drying cylinder body (1).
10. The high-efficiency drying device of the papermaking drying section according to claim 1, characterized in that: The enclosed cavity is a enclosed hood system, an exhaust fan (8) is installed on the outside of the enclosed cavity.