Bottleneck type anti-necking self-sealing feeding structure for tower type continuous evaporator
The bottleneck reverse-throat self-sealing feed structure addresses the challenge of reliable material feeding and steam leakage in tower continuous steaming by forming a dense material column to maintain pressure stability and improve pulping process efficiency.
Patent Information
- Application Number
- CN202510503297.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2025-07-15
Smart Images
Figure CN120312909A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of feeding devices in the cooking process, and in particular to a bottleneck type anti-shrinking and self-sealing feeding structure for tower continuous cooking. Background Art
[0002] Tower continuous cooking, as an important raw material cooking and softening pulping process, is widely used in the pulp and paper industry. To achieve efficient cooking and high-quality pulp production, this process is usually carried out under high temperature and high pressure conditions. During tower continuous cooking, raw materials such as wood chips and straw need to be continuously and evenly fed into the cooking tower to ensure the continuity and stability of the reaction.
[0003] However, compared with batch cooking, tower continuous cooking faces unique challenges. Since the pressure inside the cooking tower is usually maintained at a relatively high level, the common pressure range is 0.8 - 1.0 MPa, while the external environment is at atmospheric pressure. This significant pressure difference poses strict requirements on the feeding process. The feeding device not only needs to overcome the pressure difference and reliably transport the raw materials into the tower, but more importantly, it must effectively prevent the leakage of high-pressure steam and raw materials inside the tower, so as to maintain the pressure stability inside the tower, avoid fluctuations in process parameters, and affect the pulp quality.
[0004] Therefore, there is an urgent need for a tower continuous cooking feeding device with a simple structure, good sealing effect, and stable feeding, which can ensure efficient and stable feeding while minimizing the risk of steam leakage to the greatest extent. Summary of the Invention
[0005] To solve the above problems, the present application provides a bottleneck type anti-shrinking and self-sealing feeding structure for tower continuous cooking, which realizes efficient and stable feeding in the high-pressure environment of tower continuous cooking.
[0006] To achieve the above object, the bottleneck type anti-shrinking and self-sealing feeding structure for tower continuous cooking designed by the present application is used to supply raw materials to a continuous cooking tower with an internal pressure higher than atmospheric pressure for cooking and softening, and includes:
[0007] A feeding screw configured to convey raw materials along the radial direction of the continuous cooking tower;
[0008] A compression pipe, one end of which is communicated with the output end of the feeding screw device for receiving the raw materials;
[0009] An anti-shrinking pipe, one end of which is communicated with the other end of the compression pipe with an inner diameter adaptation, the other end of the anti-shrinking pipe is communicated with the feeding port of the continuous cooking tower, and the cross-sectional area of the anti-shrinking pipe gradually increases along the raw material conveying direction of the feeding screw; A pressing device includes a pressing member movable along the axial direction of the compression pipe, and a driving mechanism for driving the pressing member to move between a pressing position and a release position;
[0010] Wherein, at the pressing position, the pressing member is located inside the compression tube and is used to block the raw materials supplied by the feeding screw inside the compression tube to form a material column by compression; at the releasing position, the pressing member is located inside the continuous steaming tower, and the anti-shrinking tube is used to receive the material column from the compression tube and allow it to expand and loosen before entering the continuous steaming tower.
[0011] A further solution is that the pressing member has a pressing end face facing the feeding screw, and the pressing end face is a conical surface or a hemispherical surface, which is used to form a compression cavity with the inner pipe wall of the compression tube.
[0012] A further solution is that the driving mechanism is a hydraulic cylinder, a pneumatic cylinder or a motor driving device.
[0013] A further solution is that the pressing device further includes a pressing rod and a receiving tube. The receiving tube is coaxially and oppositely arranged on the outer peripheral wall of the continuous steaming tower relative to the anti-shrinking tube. The driving mechanism is fixedly installed at one end of the receiving tube away from the compression tube. One end of the pressing rod is connected to the power output end of the driving mechanism, and the other end extends into the receiving tube and is connected to the pressing member; wherein, a sealing shaft sleeve for the pressing rod to pass through is provided at one end of the receiving tube facing the driving mechanism; at the releasing position, the pressing rod is received inside the receiving tube.
[0014] A further solution is that the pitch of the feeding screw gradually decreases from its feeding end to its discharging end.
[0015] A further solution is that the anti-shrinking tube has a straight section extending towards the feeding screw, the compression tube is coaxially fixed inside the straight section, and a transition cavity is formed by the interval between the outer peripheral wall of the compression tube and the inner peripheral wall of the straight section. A balance tube communicating the transition cavity and the continuous steaming tower is provided on the outer peripheral wall of the straight section.
[0016] A further solution is that a branch pipe communicating with an external steam pipe is provided on the balance tube, and a valve for selectively conducting or cutting off the connection between the balance tube and the steam pipe is provided on the branch pipe.
[0017] A further solution is that the output end of the feeding screw device and the compression tube, between the compression tube and the anti-shrinking tube, and between the anti-shrinking tube and the feeding port are all connected by sealed flanges.
[0018] A further solution is that it further includes a pressure sensor and a controller. The pressure sensor is arranged inside the continuous steaming tower and is used to detect the pressure inside the continuous steaming tower; the controller is configured to control the driving mechanism to drive the pressing member to move to the pressing position when it detects that the pressure drop inside the continuous steaming tower exceeds a preset threshold.
[0019] The bottleneck type anti-shrinking mouth self-sealing feeding structure for tower continuous cooking designed in the present application utilizes the feeding bottleneck formed by the cooperation of the compression pipe and the anti-shrinking pipe, and is supplemented by a pressing member to form a high-density material column in the compression pipe. It can effectively block the leakage of high-pressure gas in the continuous cooking tower during feeding by using the material column, without relying on complex auxiliary sealing devices, significantly simplifies the structure, reduces the manufacturing cost. At the same time, it also reduces the risk of shutdown caused by the failure of the auxiliary sealing device, and improves the reliability and continuity of production. Brief Description of the Drawings
[0020] Figure 1 is a schematic plan view of the bottleneck type anti-shrinking mouth self-sealing feeding structure for tower continuous cooking provided by an embodiment of the present application.
[0021] Figure 2 is Figure 1 an enlarged view of part A in
[0022] Wherein: continuous cooking tower 10, feeding port 11, feeding screw 20, compression pipe 30, balance pipe 31, anti-shrinking pipe 40, straight section 41, transition cavity 42, pressing device 50, pressing member 51, pressing end face 511, driving mechanism 52, pressing rod 53, receiving pipe 54, sealing shaft sleeve 55, material column 60. Detailed Embodiment
[0023] The following describes the preferred embodiments of the present application with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for explaining and illustrating the present application, and are not used to limit the present application.
[0024] As Figure 1 、 Figure 2 shown, the bottleneck type anti-shrinking mouth self-sealing feeding structure for tower continuous cooking described in this embodiment is used to supply raw materials to the continuous cooking tower 10 with internal pressure higher than atmospheric pressure for cooking and softening, while preventing the internal pressure of the continuous cooking tower 10 from leaking out through the feeding port 11 when supplying raw materials. The sealed feeding structure mainly consists of the following components:
[0025] Feeding screw 20, configured to convey raw materials along the radial direction of the continuous cooking tower 10. For example, raw materials such as wood chips and straw are stably conveyed along the horizontal radial direction of the continuous cooking tower 10. In this embodiment, the feeding screw 20 adopts a variable pitch design, and its pitch gradually decreases from the feeding end to the discharging end to achieve pre-compression during the raw material conveying process, thereby enhancing the formation efficiency of the subsequent material column 60.
[0026] Compression pipe 30, which is integrally cylindrical, and one end thereof is communicated with the output end of the feeding screw 20 device for receiving the raw materials. In this embodiment, the inner diameter of the compression pipe 30 is set to be slightly larger than the output diameter of the feeding screw 20 to facilitate the smooth entry of the raw materials.
[0027] The reverse reduction tube 40 has one end that is adapted to be connected with the inner diameter of the other end of the compression tube 30, and the other end of the reverse reduction tube 40 is connected with the feed port 11 of the continuous distillation tower 10, and the cross-sectional area of the reverse reduction tube 40 gradually increases along the raw material conveying direction of the feed screw 20 to form a trumpet shape. Its main function is to receive the material column 60 from the compression tube 30, allowing the material column 60 to have enough space to expand and loosen, thereby reducing the conveying resistance of the raw material and facilitating the subsequent continuous feeding to push the loosened raw material into the continuous distillation tower 10.
[0028] The top pressing device 50 includes a top pressing member 51 which is movable along the axial direction of the compression tube 30, and a driving mechanism 52 for driving the top pressing member 51 to move between a clamping position and a releasing position; wherein, in the clamping position, the top pressing member 51 is located in the compression tube 30, and is used to block the raw material supplied by the feed screw 20 in the compression tube 30 and compress it to form a material column 60; in the releasing position, the top pressing member 51 is located in the continuous distillation tower 10.
[0029] Specifically, the driving mechanism 52 can be a hydraulic cylinder, a pneumatic cylinder or a motor drive device, which is used to provide the power required for the top pressure piece 51 to switch between two working positions: in the compression position, the top pressure piece 51 is located in the compression tube 30, blocking the raw material supplied by the feed screw 20 in the compression tube 30, so that it is compressed under the action of continuous thrust to form a sealed material column 60, effectively isolating the high pressure in the continuous steam tower from the external atmospheric pressure; in the release position, the top pressure piece 51 retreats into the continuous steam tower 10, and the material column 60 enters the reverse reduction tube 40 under the continuous push of the feed screw 20, and enters the interior of the continuous steam tower 10 after expanding and loosening in the reverse reduction tube 40, while new raw materials continue to enter the compression tube 30 to form a new sealed material column, and the feeding steps are repeated to achieve continuous feeding.
[0030] In a specific example, it also includes a pressure sensor and a controller, wherein the pressure sensor is disposed in the continuous steaming tower 10 for detecting the pressure in the continuous steaming tower 10; the controller is configured to control the driving mechanism 52 to drive the top pressure member 51 to move to the top pressure position when it detects that the pressure in the continuous steaming tower 10 drops by more than a preset threshold value, and to re-form a new high-density material column 60 at the entrance of the compression tube 30, so as to enhance the sealing effect, effectively curb the leakage of high-pressure steam in the continuous steaming tower 10, and further continuously and stably maintain the working pressure in the continuous steaming tower 10 within a preset target pressure range, thereby ensuring the stable and efficient operation of the cooking process.
[0031] In some embodiments, Figure 1As shown, the pressing member 51 has a pressing end face 511 facing the feeding screw 20, and the pressing end face 511 is a conical face or a hemispherical face, which is used to form a compression cavity with the inner pipe wall of the compression pipe 30. With this structural design, compared with the pressing member 41 with a flat end face, the conical face or hemispherical face of the pressing end face 511 makes the compressed material column 60 not a complete cylindrical shape, but a concave pit is formed at one end in contact with the pressing end face 511. At the edge position of the concave pit, the density of the raw material is relatively low and the binding force is also relatively weak. When the material column 60 enters the anti-shrinking pipe 40 with a larger pipe diameter, due to the sudden drop in pressure, the material column 60 begins to expand, and the position with the concave pit is more likely to accelerate the process of expansion and loosening, so as to improve the cooking effect of the subsequent raw materials entering the continuous cooking tower 10.
[0032] In some embodiments, as Figure 1 shown, the pressing device 50 further includes a pressing rod 53 and a receiving pipe 54. The receiving pipe 54 is coaxially and oppositely arranged on the outer peripheral wall of the continuous cooking tower 10 relative to the anti-shrinking pipe 40 to form a closed cavity for accommodating and protecting the pressing rod 53. The driving mechanism 52 is fixedly installed at one end of the receiving pipe 54 away from the compression pipe 30, which is convenient for installation and later maintenance. One end of the pressing rod 53 is connected to the power output end of the driving mechanism 52, and the other end extends into the receiving pipe 54 and is connected to the pressing member 51; wherein, a sealing shaft sleeve 55 for the pressing rod 53 to pass through is provided at one end of the receiving pipe 54 facing the driving mechanism 52, which reduces steam leakage while ensuring the free expansion and contraction of the pressing rod 53; in the release position, the pressing rod 53 is received in the receiving pipe 54, leaving space for the smooth passage of the raw materials and avoiding interference.
[0033] In some embodiments, as Figure 1 、 Figure 2 shown, the anti-shrinking pipe 40 has a straight section 41 extending towards the feeding screw 20, and the compression pipe 30 is coaxially fixed in the straight section 41 and is firmly connected by welding, bolt connection, etc. to form an integral structure; and a transition cavity 42 is formed between the outer peripheral wall of the compression pipe 30 and the inner peripheral wall of the straight section 41, and a balance pipe 31 communicating the transition cavity 42 and the continuous cooking tower 40 is provided on the outer peripheral wall of the straight section 41. That is, the balance pipe 31 is located at the front end of the anti-shrinking pipe 40, and can introduce the pressure inside the continuous cooking tower 10 into the transition cavity 42 in real time when the continuous cooking tower 10 is working, so as to form a more uniform pressure environment inside the anti-shrinking pipe 40. In this way, by setting the balance pipe 31 to reduce the conveying resistance, it can effectively avoid the uneven diffusion of the raw materials in the anti-shrinking pipe 40 caused by the pressure impact from the inside of the continuous cooking tower 10, so that the material column can achieve more uniform expansion and loosening in the anti-shrinking pipe 40.
[0034] In some embodiments, a branch pipe (not shown in the figure) communicating with an external steam pipe (not shown in the figure) is provided on the balance pipe 31, and a valve (not shown in the figure) for selectively conducting or cutting off the communication between the balance pipe and the steam pipe is provided on the branch pipe. In the normal working state, the valve is in the closed state, and steam will not enter the balance pipe 31. At this time, the main function of the balance pipe 31 is to balance the pressure inside and outside the anti-backflow pipe 40 to ensure the stability and uniformity of the feeding. During the actual operation process, if it is found that there is a sign of material accumulation inside the anti-backflow pipe 40, the operator can manually open the valve to introduce steam into the balance pipe 31. By using the high-speed scouring effect of the steam, the material attached to the inner wall of the anti-backflow pipe 40 can be purged and brought into the continuous cooking tower 10. After the steam purging is completed, the operator then manually closes the valve to restore the normal feeding state. Through the above structural design, the on-line cleaning of the anti-backflow pipe 40 can be realized without stopping the machine, which greatly improves the production efficiency.
[0035] In some embodiments, as Figure 1 shown, the output end of the feeding screw 20 device, between the compression pipe 30 and the anti-backflow pipe 40, and between the anti-backflow pipe 40 and the feeding port 11 are all connected by sealed flanges. Flange connection has the property of being detachable, and good sealing effect can be achieved by adding sealing gaskets. When it is necessary to conduct regular inspections, maintenance, fault repairs, or component replacements on components such as the feeding screw 20 device, the compression pipe 30, the anti-backflow pipe 40, or the feeding port 11 of the continuous cooking tower, only need to loosen the bolts of the flange connection, and the connected components can be quickly and conveniently disassembled for corresponding operations.
[0036] The bottleneck type anti-backflow self-sealing feeding structure for tower continuous cooking provided by this embodiment utilizes the feeding bottleneck formed by the cooperation of the compression pipe and the anti-backflow pipe, and is supplemented by a pressing member to form a high-density material column in the compression pipe, which can effectively block the leakage of high-pressure gas in the continuous cooking tower during feeding by using the material column. It does not rely on complex auxiliary sealing devices, significantly simplifies the structure, reduces the manufacturing cost, and at the same time, also reduces the risk of downtime caused by the failure of the auxiliary sealing device, improving the reliability and continuity of production.
[0037] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application.
[0038] In the description of the present application, it should also be noted that, unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.
[0039] Finally, it should be noted that the above are only the preferred embodiments of the present application and are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A bottleneck type anti-shrinking and self-sealing feeding structure for tower continuous cooking, which is used to supply raw materials to a continuous cooking tower with internal pressure higher than atmospheric pressure for cooking and softening, and is characterized in that, include: A feed screw configured to convey the raw material radially along the continuous distillation tower; A compression tube, one end of which is connected to the output end of the feed screw device and is used to receive the raw material; A reverse shrinkage tube, one end of which is connected to the other end of the compression tube by an inner diameter adaptation, the other end of the reverse shrinkage tube is connected to the feed port of the continuous distillation tower, and the cross-sectional area of the reverse shrinkage tube gradually increases along the raw material conveying direction of the feed screw; a top pressing device, comprising a top pressing member movable along the axial direction of the compression tube, and a driving mechanism for driving the top pressing member to move between a pressing position and a releasing position; Wherein, in the compression position, the pressing member is located in the compression tube, and is used to block the raw material supplied by the feed screw in the compression tube and compress it to form a material column; in the release position, the pressing member is located in the continuous distillation tower, and the reverse reduction tube is used to receive the material column from the compression tube and allow it to expand and loosen before entering the continuous distillation tower.
2. The bottleneck type anti-shrinking mouth self-sealing feeding structure for tower continuous steaming according to claim 1, characterized in that, The pressing member has a compression end surface facing the feed spiral, and the compression end surface is a conical surface or a hemispherical surface, which is used to form a compression cavity with the inner tube wall of the compression tube.
3. The bottleneck type anti-shrinking and self-sealing feeding structure for tower continuous steaming according to claim 1, wherein The driving mechanism is a hydraulic cylinder, a pneumatic cylinder or a motor driving device.
4. The bottleneck type anti-shrinking mouth self-sealing feeding structure for tower continuous steaming according to claim 1 or 3, characterized in that, The pressing device also includes a pressing rod and a receiving tube. The receiving tube is coaxially arranged on the outer peripheral wall of the continuous steaming tower relative to the reverse reduction tube. The driving mechanism is fixedly installed on the end of the receiving tube away from the compression tube. One end of the pressing rod is connected to the power output end of the driving mechanism, and the other end extends into the receiving tube and is connected to the pressing member. A sealing sleeve is provided at one end of the receiving tube facing the driving mechanism for the pressing rod to pass through. In the release position, the pressing rod is received in the receiving tube.
5. The bottleneck type anti-shrinking mouth self-sealing feeding structure for tower continuous cooking according to claim 1, characterized in that, The pitch of the feed screw gradually decreases from its feed end to its discharge end.
6. The bottleneck type anti-shrinking and self-sealing feeding structure for tower continuous cooking according to claim 1, wherein The reverse reduction tube has a straight section extending toward the feed spiral, the compression tube is coaxially fixed in the straight section, and the outer peripheral wall of the compression tube and the inner peripheral wall of the straight section are spaced apart to form a transition cavity, and a balance pipe connecting the transition cavity and the continuous distillation tower is arranged on the outer peripheral wall of the straight section.
7. The bottleneck type anti-shrinking mouth self-sealing feeding structure for tower continuous cooking according to claim 6, characterized in that, The balancing pipe is provided with a branch pipe connected to an external steam pipeline, and the branch pipe is provided with a valve for selectively opening or cutting off the connection between the balancing pipe and the steam pipeline.
8. The bottleneck type anti-shrinking mouth self-sealing feeding structure for tower continuous steaming according to claim 1, characterized in that The output end of the feed screw device and the compression pipe, the compression pipe and the reverse contraction pipe, and the reverse contraction pipe and the feed port are all connected via sealing flanges.
9. The bottleneck type anti-shrinking mouth self-sealing feeding structure for tower continuous steaming according to claim 1, characterized in that It also includes a pressure sensor and a controller, wherein the pressure sensor is arranged in the continuous steaming tower and is used to detect the pressure in the continuous steaming tower; the controller is configured to control the driving mechanism to drive the top pressure piece to move to the top pressure position when it is detected that the pressure in the continuous steaming tower drops by more than a preset threshold.