A control system for spraying starch backflow
Patent Information
- Application Number
- CN202522288412.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-29
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-10-29
AI Technical Summary
改造后为了能够单独计算出各层添加量，所以各层的回流是回到各层的转子增压泵前，但是由于用量大、供料泵压力大，导致各层回流无法回流至增压泵入口（回流压力小于供料泵压力导致憋压；导致系统无法进行有效的过滤和保证顺畅的流速，系统容易发生沉积絮聚，导致淀粉滴的产生，并且在每次断停时需要安排专人进行整个系统的拆清，造成工作量繁重，质量次品多
底芯层喷淋淀粉管、所有衬芯层喷淋淀粉管和面衬层喷淋淀粉管后端并联后连接有将三支分流浆料汇集回流的总回流管，且各层喷淋管后端分别设置有用于检测每支管路对应的芯纸各层回流量的流量计，能够实现各层独立计量；总回流管有效避免淀粉浆料因回流问题导致的沉积及造成的非计划停机，有效减少人工每次停机的拆清工作；以及解决纸张存在的淀粉滴脏点问题，有效提高纸张的质量。
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Figure CN224741368U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of starch spraying, and in particular to a control system for the return flow of sprayed starch. Background Technology
[0002] In the papermaking industry, to improve interlayer bonding, the amount of sprayed starch used has been increased from 3 kg per ton of paper to over 10 kg per ton, necessitating technical modifications to the sprayed starch system. After the modification, to allow for individual calculation of the amount added to each layer, the return flow from each layer is routed back to the rotor booster pump for that layer. However, due to the large volume and high pressure of the feed pump, the return flow from each layer cannot reach the booster pump inlet (the return pressure is lower than the feed pump pressure, causing pressure buildup). This prevents the system from effectively filtering and ensuring a smooth flow rate, leading to sedimentation and flocculation, resulting in starch droplets. Furthermore, each system shutdown requires dedicated personnel to disassemble and clean the entire system, resulting in a heavy workload and a high number of substandard products.
[0003] From the above technical modifications, it is clear that if a large-volume backflow occurs in the starch spraying system, it will cause a series of problems during operation, mainly in three aspects: spraying quality, system stability, and operating costs. First, it will cause unstable pressure and flow at the nozzles, resulting in poor atomization and uneven starch adhesion points, forming starch dots and small bright spots, affecting the interlayer bonding strength of the paper sheets, and in severe cases, leading to paper defects such as holes and edge cracks. Second, system blockage and equipment wear will occur. The starch slurry settles in the low-speed or dead zones of the pipeline, especially after shutdown, which can easily clog nozzles and filters. The large-volume backflow will exacerbate the erosion of pumps, valves, and pipelines by the slurry. Third, energy consumption and slurry deterioration will occur. A large amount of slurry will circulate ineffectively within the system, requiring the pump to work continuously, resulting in wasted electricity. The starch slurry will remain in the system for too long, especially at suitable temperatures, which can easily breed microorganisms and cause the slurry to deteriorate.
[0004] Therefore, there is an urgent need for new technological inventions to solve the above problems. Utility Model Content
[0005] This utility model provides a control system for the return of sprayed starch. The system collects and returns the slurry from the three branch sprayed starch pipes (bottom core layer, all lining core layer, and top lining layer) to the sprayed starch working tank through the main return pipe. This effectively avoids the deposition of starch slurry caused by the return problem and the resulting unplanned downtime, and effectively reduces the manual cleaning work required for each downtime.
[0006] The technical solution adopted by this utility model to solve its technical problem is: A control system for sprayed starch reflux includes a sprayed starch dissolving tank, a screw pump, a sprayed starch working tank, a first switching valve, a bottom core layer sprayed starch pipe, at least one set of core layer sprayed starch pipes and surface lining layer sprayed starch pipes. The dissolved starch passes sequentially through the sprayed starch dissolving tank, the screw pump and the sprayed starch working tank. After the first switching valve is opened, the slurry pumped out passes sequentially through a fourth rotor pump, a main filter and a fifth pressure transmitter installed on the pipeline. The slurry is split into three branches by the fifth pressure transmitter, which respectively pass through flow statistics, flow regulation, rotor pressurization, filtration and pressure regulation, and then enter the bottom core layer spray starch pipe, a set of core layer spray starch pipes, or two or more sets of core layer spray starch pipes and surface lining layer spray starch pipes connected in parallel. The bottom core layer spray starch pipe, all the lining core layer spray starch pipes and the top lining layer spray starch pipe are connected in parallel at their rear ends to a main return pipe that collects and returns the three branch slurries. The rear ends of the bottom core layer spray starch pipe, all the lining core layer spray starch pipes and the top lining layer spray starch pipe are respectively equipped with flow meters for detecting the return flow of each core paper layer corresponding to each pipe. The starch slurry collected in the main return pipe is filtered through a vibrating screen and then returned to the sprayed starch working tank for recycling.
[0007] Preferably, the tail end of the main return pipe and the three branch pipes that respectively enter the bottom core layer spray starch pipe, the core lining layer spray starch pipe and the surface lining layer spray starch pipe are connected at multiple points to flanges and flushing water interfaces for disassembly and cleaning during shutdown.
[0008] Preferably, a centrifugal pump is connected to the fourth rotor pump and the starch spraying tank via a pipeline to return the starch slurry output by the fourth rotor pump.
[0009] Preferably, the inlet end of the fourth rotor pump is also connected to an external first clean water pipeline for performing a series washing operation when the pump is stopped, and a second switch valve for controlling the on / off state of the pipeline is provided on the external first clean water pipeline.
[0010] Preferably, the branch pipeline between the fifth pressure transmitter and the bottom core layer sprayed starch pipe is also sequentially connected to a first flow meter, a first regulating valve, a first rotor pump, a first filter and a first pressure transmitter for flow statistics, flow regulation, rotor boosting, filtration and pressure regulation; The branch pipeline between the fifth pressure transmitter and the starch spraying pipe of the lining layer is also sequentially connected to a second flow meter, a second regulating valve, a second rotor pump, a second filter, and a second pressure transmitter for flow statistics, flow regulation, rotor boosting, filtration, and pressure regulation. The branch pipes corresponding to the fifth pressure transmitter and the starch spraying pipe of the surface lining are also sequentially connected to a third flow meter, a third regulating valve, a third rotor pump, a third filter, and a third pressure transmitter for flow statistics, flow regulation, rotor boosting, filtration, and pressure regulation.
[0011] Preferably, the inlet pipes of the first rotor pump, the second rotor pump and the third rotor pump are respectively connected to an external second clean water pipe for series washing when the pump is stopped via a branch-connected check valve. The external second clean water pipe is also sequentially equipped with a fourth regulating valve for regulating the clean water flow rate and a fourth pressure transmitter for regulating the clean water pressure.
[0012] The beneficial effects of this utility model are: The bottom core layer spraying starch pipe, all the lining core layer spraying starch pipes, and the top lining layer spraying starch pipe are connected in parallel at their rear ends to a main return pipe that collects and returns the three branch slurries. Each spraying pipe is equipped with a flow meter at its rear end to detect the return flow of each core paper layer corresponding to each pipe, enabling independent metering of each layer. The main return pipe effectively avoids starch slurry deposition caused by return flow and unplanned downtime, effectively reducing the manual cleaning work required for each downtime. It also solves the problem of starch droplets on the paper, effectively improving the quality of the paper.
[0013] Meanwhile, flanges and flushing water interfaces are connected at multiple points on the tail end of the main return pipe and the three branch pipes corresponding to each layer of spray pipes, so as to realize disassembly and cleaning and cross-flushing work when the machine is stopped, effectively avoiding the deposition of starch slurry in the pipeline, improving the cleanliness of the pipeline in the system, and eliminating unplanned shutdown problems caused by poor return.
[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description
[0015] Figure 1 This is a system schematic diagram of this utility model. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0017] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be reasonably determined in conjunction with the specific content of the technical solution.
[0018] Furthermore, the terms “first,” “second,” “third,” etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.
[0019] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0020] A control system for sprayed starch recirculation, such as Figure 1As shown, the system includes a starch dissolving tank 1, a screw pump 2, a starch working tank 3, a first switching valve 4, a bottom core layer starch spraying pipe 5, two sets of parallel core layer starch spraying pipes 6 and a top lining layer starch spraying pipe 7. The dissolved starch passes sequentially through the starch dissolving tank 1, screw pump 2, and starch working tank 3. After the first switching valve 4 is opened, the pumped slurry passes sequentially through a fourth rotor pump 8, a main filter 9, and a fifth pressure transmitter 10 installed on the pipeline. The slurry is then split into three branches by the fifth pressure transmitter 10, each branch flowing through... After flow statistics, flow regulation, rotor pressurization, filtration, and pressure regulation, the starch enters the bottom core layer spraying starch pipe 5, the parallel lining layer spraying starch pipe 6, and the top lining layer spraying starch pipe 7; the branch pipes corresponding to the fifth pressure transmitter 10 and the bottom core layer spraying starch pipe 5 are also sequentially connected to the first flow statistic 11, the first regulating valve 12, the first rotor pump 13, the first filter 14, and the first pressure transmitter 15 for flow statistics, flow regulation, rotor pressurization, filtration, and pressure regulation; the fifth pressure transmitter 10 and the lining layer spraying starch pipe 7... The branch pipes between the starch pipes 6 are sequentially connected to a second flow meter 16, a second regulating valve 17, a second rotor pump 18, a second filter 19, and a second pressure transmitter 20 for flow statistics, flow regulation, rotor pressurization, filtration, and pressure regulation; the branch pipes between the fifth pressure transmitter 10 and the surface lining spray starch pipe 7 are sequentially connected to a third flow meter 21, a third regulating valve 22, a third rotor pump 23, and a third filter 24 for flow statistics, flow regulation, rotor pressurization, filtration, and pressure regulation. The system includes a third pressure transmitter 25; a main return pipe 26 is connected in parallel at the rear ends of the bottom core layer spray starch pipe 5, all the core layer spray starch pipes 6 and the top lining layer spray starch pipe 7 to collect and return the three branch slurries; flow meters 27 are respectively installed at the rear ends of the bottom core layer spray starch pipe 5, all the core layer spray starch pipes 6 and the top lining layer spray starch pipe 7 to detect the return flow of each core paper layer corresponding to each pipe; the starch slurry collected in the main return pipe 26 is filtered by the set vibrating screen 28 and then returned to the spray starch working tank 3 for recycling.
[0021] Continue as Figure 1 As shown, at the tail end of the main return pipe 26, and on the three branch pipes that respectively enter the bottom core layer spray starch pipe 5, the core layer spray starch pipe 6, and the surface lining layer spray starch pipe 7, there are multiple flanges (not shown in the figure) and flushing water interfaces 29 connected for disassembly and cleaning and cross-washing during shutdown. The fourth rotor pump 8 and the spray starch working tank 3 are also connected by a pipeline to a centrifugal pump 30 that returns the starch slurry output by the fourth rotor pump 8. The inlet end of the fourth rotor pump 8 is also connected to an external first clean water pipeline 31 for cross-washing during shutdown. A second switch valve 32 for controlling the opening and closing of the pipeline is installed on the external first clean water pipeline 31.
[0022] Continue as Figure 1As shown, the inlet pipes of the first rotor pump 13, the second rotor pump 18 and the third rotor pump 23 are respectively connected to the external second clean water pipe 34 for series washing when the pump is stopped via a branch check valve 33. The external second clean water pipe 34 is also equipped with a fourth regulating valve 35 for regulating the clean water flow and a fourth pressure transmitter 36 for regulating the clean water pressure.
[0023] In this embodiment, the rear ends of each layer of starch spraying pipes are connected in parallel to a main return pipe 26 that collects and returns the three branch slurries. Each layer of starch spraying pipe is equipped with a flow meter at its rear end to detect the return flow rate of each core paper layer corresponding to each pipe, enabling independent metering for each layer. The main return pipe 26 effectively prevents starch slurry deposition and unplanned downtime caused by return flow issues, significantly reducing manual cleaning work during each downtime. Furthermore, the returned starch from the main return pipe 26 can be screened again through a vibrating screen, further improving the cleanliness of the raw materials and effectively solving the problem of starch droplets on the paper, thus improving paper quality.
[0024] The above-described embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. All equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.
Claims
1. A control system for spraying starch backflow, characterized in that, The system includes a starch dissolving tank, a screw pump, a starch working tank, a first switch valve, a bottom core layer starch spraying pipe, at least one set of core layer starch spraying pipes and surface lining layer starch spraying pipes. The dissolved starch passes through the starch dissolving tank, the screw pump and the starch working tank in sequence. After the first switch valve is opened, the slurry pumped out passes through a fourth rotor pump, a main filter and a fifth pressure transmitter installed on the pipeline in sequence. The slurry is split into three branches by the fifth pressure transmitter, which respectively pass through flow statistics, flow regulation, rotor pressurization, filtration and pressure regulation, and then enter the bottom core layer spray starch pipe, a set of core layer spray starch pipes, or two or more sets of core layer spray starch pipes and surface lining layer spray starch pipes connected in parallel. The bottom core layer spray starch pipe, all the lining core layer spray starch pipes and the top lining layer spray starch pipe are connected in parallel at their rear ends to a main return pipe that collects and returns the three branch slurries. The rear ends of the bottom core layer spray starch pipe, all the lining core layer spray starch pipes and the top lining layer spray starch pipe are respectively equipped with flow meters for detecting the return flow of each core paper layer corresponding to each pipe. The starch slurry collected in the main return pipe is filtered through a vibrating screen and then returned to the sprayed starch working tank for recycling.
2. The control system for sprayed starch recirculation according to claim 1, characterized in that, At the tail end of the main return pipe, and on the three branch pipes that respectively enter the bottom core layer spray starch pipe, the core lining layer spray starch pipe, and the top lining layer spray starch pipe, there are multiple flanges and flushing water interfaces for disassembly and cleaning during shutdown.
3. The control system for sprayed starch recirculation according to claim 1, characterized in that, The fourth rotor pump is also connected to the starch spraying tank via a pipeline, which is a centrifugal pump that returns the starch slurry output by the fourth rotor pump.
4. A control system for spraying starch backflow according to claim 1, characterized in that, The inlet end of the fourth rotor pump is also connected to an external first clean water pipeline for series washing when the pump is stopped. A second switch valve for controlling the on / off state of the pipeline is installed on the external first clean water pipeline.
5. A control system for sprayed starch recirculation according to claim 1, characterized in that: The branch pipeline between the fifth pressure transmitter and the bottom core layer sprayed starch pipe is also sequentially connected to a first flow meter, a first regulating valve, a first rotor pump, a first filter and a first pressure transmitter for flow statistics, flow regulation, rotor boosting, filtration and pressure regulation. The branch pipeline between the fifth pressure transmitter and the starch spraying pipe of the lining layer is also sequentially connected to a second flow meter, a second regulating valve, a second rotor pump, a second filter, and a second pressure transmitter for flow statistics, flow regulation, rotor boosting, filtration, and pressure regulation. The branch pipes corresponding to the fifth pressure transmitter and the starch spraying pipe of the surface lining are also sequentially connected to a third flow meter, a third regulating valve, a third rotor pump, a third filter, and a third pressure transmitter for flow statistics, flow regulation, rotor boosting, filtration, and pressure regulation.
6. A control system for sprayed starch recirculation according to claim 5, characterized in that: The inlet pipes of the first rotor pump, the second rotor pump and the third rotor pump are also connected to an external second clean water pipe for series washing when the pump is stopped, respectively, through a branch-connected check valve. The external second clean water pipe is also equipped with a fourth regulating valve for regulating the clean water flow and a fourth pressure transmitter for regulating the clean water pressure.