Pulping system

Abstract

According to the pulping system provided by the utility model, the structure of the pulping system is improved, so that different working conditions can be quickly switched according to the difference of product strength indexes, the pulping effect is ensured, and meanwhile, the waste of energy consumption is avoided. The utility model provides a pulping system which comprises a before-beating tower, a plurality of after-beating towers, a first disc mill and a second disc mill, the first disc mill and the second disc mill are used for supplying materials to the after-beating towers, and the pulping system can be switched between a first working condition and a second working condition. Under the first working condition, the before-knocking tower, the first disc mill and the second disc mill are sequentially communicated, and the first disc mill and the second disc mill jointly supply materials to the after-knocking tower; and in the second working condition, the first disc mill and the second disc mill are both directly communicated with the before-knocking tower, and the first disc mill and the second disc mill supply materials to the corresponding after-knocking tower.

Description

Technical Field

[0001] This utility model relates to the field of pulping technology, specifically to a pulping system. Background Technology

[0002] In industrial production fields involving pulping and papermaking, such as refining, the refining process is a critical step, and its efficiency and energy consumption control have a vital impact on a company's production costs, product quality, and resource utilization efficiency. Traditional refining systems often employ either tandem refining systems or single-mill refining systems to refine the pulp. However, using tandem refining systems results in significant power consumption and resource waste. Using single-mill refining systems leads to relatively low refining power, and the refining effect cannot meet the high strength requirements of the product. Utility Model Content

[0003] The purpose of this invention is to provide a pulping system that, by improving the structure of the pulping system, can quickly switch between different working conditions according to different product strength indicators, thus ensuring the pulping effect while avoiding energy waste.

[0004] To achieve the above objectives, this utility model provides a pulping system, which includes a pre-powder tower, several post-powder towers, and several first and second disc mills for feeding the post-powder towers. The pulping system can switch between one working condition and two working conditions.

[0005] In one operating condition, the pre-tapping tower, the first disc mill, and the second disc mill are connected in sequence, and each disc mill supplies material to the post-tapping tower. In the other operating condition, the pre-tapping tower is connected to the first disc mill and the second disc mill, respectively, and the first disc mill and the second disc mill supply material to the corresponding post-tapping tower.

[0006] Optionally, the pulping system includes a first flow path corresponding to the first working condition, a second flow path corresponding to the second working condition, and a controller;

[0007] Both the first flow path and the second flow path include several valves, and the controller is signal-connected to each of the valves.

[0008] Optionally, the grinding system includes a first grinding tower, a second grinding tower, a pipe first that connects each of the disc mills to the first grinding tower in sequence, and a pipe second that connects one end to the second grinding tower.

[0009] The other end of the second tube is connected to the position between the disc mill and the first tapping tower of the first tube.

[0010] Optionally, the second disc mill is closer to the pre-knocking tower than the first disc mill;

[0011] It also includes a tube three, one end of which can be connected to or disconnected from the first tower after knocking;

[0012] The other end of the third tube is connected to the position between the first and second disc mills of the first tube.

[0013] Optionally, the pulping system further includes a tube capable of switching between a connected position and a disconnected position.

[0014] One end of the tube is connected to the upstream of the first disc mill, and the other end is connected to the downstream of the first disc mill.

[0015] Optionally, each of the disc mills is connected to or disconnected from the first pipe via a feed pipe and a discharge pipe.

[0016] Optionally, both the feed pipe and the discharge pipe are equipped with pressure detection devices.

[0017] Optionally, the discharge pipe is also equipped with a temperature detection device, which is located downstream of the pressure detection device.

[0018] Optionally, a slag removal device is also connected between the pre-pressing tower and the disc mill.

[0019] Optionally, the pulping system further includes a pre-pump pump and a thickener supply device, wherein the pre-pump pump may be selectively connected to at least one of the pre-pump tower and the thickener supply device.

[0020] The technical solution of this application enables flexible and rapid switching between two working conditions in the pulping system. It can quickly switch to the appropriate pulping condition based on the differences in product strength indicators, ensuring pulping effect and saving energy. This reduces the overall power consumption of the pulping system.

[0021] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0023] Figure 1 This is a schematic diagram of the pulping system in an embodiment of this utility model.

[0024] Figure label:

[0025] 1-Pre-inlet tower; 12-Second position; 13-Third position; 14-Fourth position; 151a-First feed pipe; 151b-First outlet pipe; 152a-Second feed pipe; 152b-Second outlet pipe; 161-First pressure detection device; 162-Second pressure detection device; 163-Third pressure detection device; 164-Fourth pressure detection device; 171-First temperature detection device; 172-Second temperature detection device; 173-Concentration detection device;

[0026] 21-Knocking on the first tower after the first knock; 22-Knocking on the second tower after the first knock;

[0027] 31 - First millstone; 32 - Second millstone;

[0028] 4-Slag removal device;

[0029] 5-Pre-pump slurry pump;

[0030] 6-Concentrated water supply device;

[0031] 7-Sealed water switch;

[0032] 80 - Tenth valve; 81 - First valve; 82 - Second valve; 83 - Third valve; 84 - Fourth valve; 85 - Fifth valve; 86 - Sixth valve; 87 - Seventh valve; 88 - Eighth valve; 89 - Ninth valve;

[0033] 91-Pipe 5; 92-Pipe 1; 93-Pipe 2; 11-First position; 94-Pipe 3; 95-Pipe 4. Detailed Implementation

[0034] This invention provides a pulping system. By improving the structure of the pulping system, different working conditions can be quickly switched according to the difference in strength indicators between high-tensile and low-tensile products, ensuring the pulping effect while avoiding energy waste.

[0035] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0037] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the pulping system in an embodiment of this utility model.

[0038] like Figure 1As shown, this application provides a pulping system, which includes a pre-refining tower 1, several post-refining towers, and at least one first disc mill 31 and a second disc mill 32. The number of the first disc mill 31 and the second disc mill 32 can be one or an integer greater than or equal to two. The pulping system also includes several pipes and several valves disposed on the pipes. By controlling the valves, the pulping system can switch between a first operating condition and a second operating condition.

[0039] In one operating condition, the first disc mill 31 and the second disc mill 32 are connected sequentially. "Sequentially connected" means that the outlets and inlets of each disc mill are connected sequentially; that is, the inlet of the downstream disc mill is connected to the outlet of the upstream disc mill, meaning that each of the first disc mills 31 and the second disc mill 32 can be connected in series. The outlet of the pre-press tower 1 is connected to the inlet of the foremost disc mill, and the outlet of the last disc mill is connected to the inlet of each post-press tower. Thus, the slurry from the pre-press tower 1 can pass through each disc mill and then enter several post-press towers, simultaneously feeding several post-press towers. Here, "fore" and "after" are defined with reference to the direction of slurry flow; the side closer to the pre-press tower 1 is "fore," and the side closer to the post-press tower is "after."

[0040] In the second operating condition, the outlet of the pre-pressing tower 1 is connected to the inlets of each of the first disc mills 31 and the second disc mill 32, respectively. "Separately connected" means that the outlet of the pre-pressing tower 1 can directly connect to the inlets of each of the first disc mills 31 and the second disc mill 32, meaning it can supply material to each of the first disc mills 31 and the second disc mill 32 independently. This differs from the first operating condition, where the outlet of the pre-pressing tower 1 is connected to the inlet of the foremost disc mill in a series of connected disc mills, but not to the other disc mills. "Not connected" means not directly connected; that is, after the slurry is discharged from the pre-pressing tower 1, it first passes through the foremost disc mill and then is conveyed backward to the inlet of the disc mills behind it. In the second operating condition, the slurry from the pre-pressing tower 1 can directly enter the inlets of each disc mill, thus supplying material to each disc mill.

[0041] In the second operating condition, the outlets of each of the first and second grinding discs 31 and 32 are connected to the inlet of the post-press tower. Here, it can be as follows: Figure 1 As shown, the number of disc mills is generally equal to the number of post-press towers. In the second operating condition, the outlet of each disc mill is connected to the inlet of each post-press tower in a one-to-one correspondence. Alternatively, the number of disc mills may differ from the number of post-press towers. Instead of a one-to-one correspondence between the outlets of each disc mill and the inlets of each post-press tower, some disc mills are connected to the inlets of some post-press towers, while the outlets of other disc mills are connected to the inlets of some post-press towers. In other words, a single disc mill can supply material to one or more post-press towers.

[0042] In one operating condition, the slurry is successively ground by several disc mills and then enters several post-press towers from the outlet of the last disc mill, thus feeding several post-press towers. Unlike the first operating condition, in the second operating condition, one disc mill feeds only one post-press tower and is disconnected from the other post-press towers, not feeding the remaining post-press towers.

[0043] In the second operating condition, the slurry enters the disc mills through the inlets of each disc mill from the pre-grinding tower 1, where it is ground. The ground slurry then enters the corresponding post-grinding tower. In the first operating condition, the slurry passes through several disc mills in sequence before entering the post-grinding tower, thus undergoing several grinding processes before entering the post-grinding tower.

[0044] For example, in such Figure 1 In the example shown, there is one first millstone 31 and one second millstone 32, and there are two knock-down towers. The number of millstones is the same as the number of knock-down towers.

[0045] In one operating condition, the slurry entering the two post-press towers passes through the first grinding disc 31 and the second grinding disc 32 sequentially, that is, it undergoes two grinding processes before entering the post-press tower, thus jointly supplying the post-press tower. The first flow path corresponds to this operating condition.

[0046] In the second operating condition, both the first grinding disc 31 and the second grinding disc 32 are directly fed by the pre-grinding tower 1 for grinding. The ground slurry then enters the corresponding post-grinding tower, thus the slurry entering the post-grinding tower undergoes one grinding process. This corresponds to the second flow path in the second operating condition.

[0047] The attached figure is a specific example and is not intended to limit the grinding system in this application. The number of the first grinding disc 31 and the second grinding disc 32 can also be three, four, five or more, and the number of the post-grinding towers can be three, four, five or more.

[0048] In the technical solution of this application, the opening and closing of corresponding pipes is achieved by controlling the opening and closing of valves, thereby enabling the pulping system to switch between two operating conditions. Specifically, several valves are provided on both the first and second flow paths. The pulping system also includes a controller, which is signal-connected to each valve to switch the pulping system between two operating conditions by controlling the corresponding valves to switch between connected and disconnected positions.

[0049] In actual production, when producing high-strength products, the pulping system is switched to operating mode one. This meets the regrinding requirements for high-strength products (such as hand towels). When producing low-strength products, the pulping system is switched to operating mode two. This meets the requirements for low-strength products (such as toilet paper) that do not require regrinding, reducing energy consumption of the pulping system, maintaining fiber length, and ensuring paper softness and bulkiness.

[0050] The technical solution of this application enables flexible and rapid switching between two working conditions in the pulping system. It can quickly switch to the appropriate pulping condition according to the needs of products with different strength indicators, ensuring pulping effect and saving energy. This reduces the overall power consumption of the pulping system.

[0051] The following description uses a specific example with reference to the accompanying drawings. In some specific embodiments, the post-refining tower includes post-refining tower one 21 and post-refining tower two 22. The refining system also includes pipe one 92, which is sequentially connected to a first disc mill 31 and a second disc mill 32. Compared to the second disc mill 32, the first disc mill 31 is closer to the pre-refining tower 1. The first end of pipe one 92 is directly or indirectly connected to the outlet of the pre-refining tower 1, and the last end is connected to post-refining tower one 21. Post-refining tower two 22 is connected to the first position 11 of pipe one 92 via pipe two 93.

[0052] The first position 11 is located at the very end of the grinding disc (e.g.) Figure 1 Between the second disc mill 32 and the knockdown tower 21. In the disc mill at the very end of tube 92 (such as...) Figure 1 A second valve 82 is installed between the second disc mill 32 and the first position 11, a third valve 83 is installed downstream of the first position 11, and a fourth valve 84 is installed on the second pipe 93. Under one operating condition, the second valve 82, the third valve 83, and the fourth valve 84 are all in the open state. Thus, the disc mill can simultaneously feed material to both feed towers.

[0053] A sixth valve 86 is provided between the outlet of the first disc mill 31 and the inlet of the second disc mill 32 of pipe 1 92. The sixth valve 86 is located downstream of the second position 12.

[0054] In this embodiment, the grinding system also includes a third pipe 94, one end of which is connected to the second position 12 of the first pipe 92, and the other end is connected to the first grinding tower 21. The third pipe 94 is equipped with a fifth valve 85. The second position 12 is located downstream of the outlet of the first disc mill 31. The outlet of the first disc mill 31 and the first grinding tower 21 can be connected or disconnected through the third pipe 94. The outlet of the second disc mill 32 is connected to the second grinding tower 22.

[0055] The grinding system also includes pipe 4 95, one end of which is connected to the third position 13 of pipe 1 92, and the other end is connected to the fourth position 14 of pipe 1 92. The third position 13 is located upstream of the first disc mill 31, and the fourth position 14 is located between the sixth valve 86 and the inlet of the second disc mill 32; pipe 4 95 is also equipped with a seventh valve 87. By controlling the seventh valve 87, the third position 13 and the fourth position 14 can be connected or disconnected through pipe 4 95. When pipe 4 95 is connected, the slurry from the pre-press tower 1 can be directly supplied to the two disc mills.

[0056] When the grinding system is in operation, valves 87 and 85 are closed, while valves 82, 83, and 84 are open. At this time, the slurry passes through pipe 92 sequentially through the first disc mill 31 and the second disc mill 32, and is simultaneously supplied to the first and second grinding towers 21 and 22.

[0057] When the grinding system is in operation mode 2, valve 86 is closed to disconnect the outlet of the first disc mill from the inlet of the second disc mill. Valve 87, valve 85, valve 82, and valve 84 are opened, and valve 83 is closed. Thus, a portion of the slurry enters the first disc mill 31 through pipe 92 and then feeds the first grinding tower 21 through pipe 94. The other portion of the slurry enters the second disc mill 32 through pipe 95 and then feeds the second grinding tower 22 through pipe 93.

[0058] Specifically, the control system can be connected to each valve via telecommunications to control the opening and closing status of each valve, thereby enabling one-click switching between the two operating conditions of the grinding system.

[0059] In other embodiments of this application, the pulping system further includes a first feed pipe 151a connected to the inlet of the first pump and a first discharge pipe 151b connected to the outlet of the first pump. Both the first feed pipe 151a and the first discharge pipe 151b are connected to pipe 92; an eighth valve 88 is also provided between the positions where the first feed pipe 151a and the first discharge pipe 151b are both connected to pipe 92. The pulping system also includes a second feed pipe 152a connected to the inlet of the second disc mill 32 and a second discharge pipe 152b connected to the outlet of the second disc mill 32. Both the second feed pipe 152a and the second discharge pipe 152b are connected to pipe 92; a ninth valve 89 is also provided between the positions where the second feed pipe 152a and the second discharge pipe 152b are both connected to pipe 92.

[0060] Under normal circumstances, valves 88 and 89 remain closed. When the disc mill needs to be inspected separately, valve 88 or 89 can be opened accordingly.

[0061] A first pressure detection device 161 is connected to the first feed pipe 151a, and a second pressure detection device 162 and a first temperature detection device 171 are also installed on the first discharge pipe 151b. A third pressure detection device 163 is connected to the second feed pipe 152a, and a fourth pressure detection device 164 and a second temperature detection device 172 are also installed on the second discharge pipe 152b. This allows for the collection of pressure data on the slurry entering the first disc mill 31 and the second disc mill 32, as well as the collection of pressure and temperature data on the slurry discharged from the first disc mill 31 and the second disc mill 32.

[0062] In actual operation, when the pressure of the slurry entering the first disc mill 31 and the second disc mill 32 exceeds the set threshold, the disc mills automatically stop grinding and issue an alarm. When the temperature of the slurry discharged from the first disc mill 31 and the second disc mill 32 exceeds the set threshold, the disc mills automatically stop grinding and issue an alarm.

[0063] In this embodiment, the first disc mill 31 and the second disc mill 32 are also connected to a sealing water supply device (not shown in the figure), which can replenish sealing water for the first disc mill 31 and the second disc mill 32. During operation, if the sealing water level is insufficient, the disc mill cannot be turned on until the sealing water is replenished to a set threshold, at which point the disc mill can operate normally. To detect whether the sealing water level meets the requirements, a sealing water switch 7 is installed on the pipes corresponding to the first disc mill 31 and the second disc mill 32. When the sealing water switch 7 signal turns gray, the disc mill cannot operate; when the sealing water switch 7 turns green, the disc mill can operate normally.

[0064] In some other embodiments of this application, a slag removal device 4 is also connected between the pre-grinding tower 1 and the grinding module. The inlet of the pre-grinding tower 1 and the slag removal device 4 are connected through pipe 5 91, and the outlet of the slag removal device 4 is connected to the end of pipe 1 92. This is used to remove slag from the slurry entering pipe 1 92.

[0065] In other embodiments, pipe 5 91 is also connected to a pre-impact slurry pump 5. The pre-impact slurry pump 5 can be connected to or disconnected from the pre-impact tower 1. A concentrate supply device 6 is also connected between the pre-impact slurry pump 5 and the pre-impact tower 1. The concentrate supply device 6 can be connected to or disconnected from the pre-impact slurry pump 5. The concentrate supply device 6 is used to replenish concentrate into pipe 5 91 to adjust the concentration of the slurry entering the grinding module.

[0066] A concentration detection device 173 is also installed between the outlet of the pre-pump 5 and the inlet of the slag removal device 4. This allows for the detection of the concentration of the slurry in pipe 5 91.

[0067] A first valve 81 is installed between the pre-pump tower 1 and the pre-pump slurry pump 5, and a tenth valve 80 is installed between the thickening water supply device 6 and pipe 91. The opening of the tenth valve 80 can be controlled to adjust the amount of thickening water added to the slurry in pipe 91. That is to say, during the process of adding thickening water to the slurry, both the first valve 81 and the tenth valve 80 remain open.

[0068] The grinding system also includes a flushing mode. In the flushing mode, the first valve 81 is closed and the tenth valve 80 is opened, thereby flushing the disc mill. In actual use, before switching the grinding system from mode one to mode two, the grinding system is controlled to enter the flushing mode to flush the pipes after use in mode one. Similarly, before switching the grinding system from mode two to mode one, the grinding system is controlled to enter the flushing mode to flush the pipes after use in mode two.

[0069] In a specific example, during the flushing process, the disc mill retracts its blade—the first valve 81 closes, the tenth valve 80 opens to 50%—the pre-impact pump 5 is started, and the pre-impact pump 5 operates at 60% pump frequency—after a set time, the tenth valve 80 is closed, the pre-impact pump 5 stops, and all disc mills and sealing water are stopped.

[0070] In other embodiments of this application, both the pre-impact tower 1 and the post-impact tower are equipped with liquid level detection devices. When the liquid level in the pre-impact tower 1 is lower than 15%, the disc mill automatically stops grinding. When the liquid level in the post-impact tower is higher than 85%, the disc mill automatically stops grinding, thereby effectively protecting the disc mill.

[0071] Compared with existing technologies, the advantages of this application are:

[0072] First, the technical solution of this application enables flexible and rapid switching of the pulping system between working condition one and working condition two, which can quickly respond to market demands, reduce downtime for line changes, and also reduce the overall power consumption of the pulping system.

[0073] Secondly, the controller can also achieve one-click switching between the first and second flow paths, thereby enabling one-click switching of the grinding system between one working condition and two working conditions. In other words, in the technical solution of this application, the grinding system can start and stop in groups between one working condition (series working condition) and two working conditions (parallel working condition) without the need for manual switching of the disc mill.

[0074] Third, the pulping system also has a flushing function, which flushes the corresponding pipes of the pulping system after the pulping process is completed.

[0075] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A pulping system, characterized in that, The grinding system includes a pre-press tower (1), a post-press tower, and a first disc mill (31) and a second disc mill (32) for supplying the post-press tower. The grinding system can switch between one working condition and two working conditions. In the aforementioned operating condition, the pre-tapping tower (1), the first disc mill (31), and the second disc mill (32) are connected in sequence to jointly supply material to the post-tapping tower; In the two operating conditions, the pre-tapping tower (1) is connected to the first disc mill (31) and the second disc mill (32) respectively, and the first disc mill (31) and the second disc mill (32) respectively supply material to the post-tapping tower.

2. The pulping system according to claim 1, characterized in that, The pulping system includes a first flow path corresponding to the first working condition, a second flow path corresponding to the second working condition, and a controller; Both the first flow path and the second flow path include several valves, and the controller is signal-connected to each of the valves.

3. The pulping system according to claim 2, characterized in that, The grinding system includes a first grinding tower (21), a second grinding tower (22), a first pipe (92) that connects the first grinding tower (31) and the second grinding tower (32) to the first grinding tower (21) in sequence, and a second pipe (93) that connects one end to the second grinding tower (22). Compared with the first disc mill (31), the second disc mill (32) is closer to the front tower (1), and the other end of the second pipe (93) is connected to the position between the second disc mill (32) and the back tower (21) of the first pipe (92).

4. The pulping system according to claim 3, characterized in that, It also includes a tube three (94) with one end connected to or disconnected from the first (21) of the first (21) of the first (21), and the other end of the tube three (94) is connected to the position between the first (31) and the second (32) of the first (92).

5. The pulping system according to claim 4, characterized in that, The pulping system also includes a tube four (95) capable of switching between a connected position and a disconnected position. One end of the tube (95) is connected to the upstream of the first disc mill (31), and the other end is connected to the downstream of the first disc mill (31).

6. The pulping system according to claim 5, characterized in that, Each of the aforementioned disc mills is connected to or disconnected from the first pipe (92) via a feed pipe and a discharge pipe.

7. The pulping system according to claim 6, characterized in that, Both the feed pipe and the discharge pipe are equipped with pressure detection devices.

8. The pulping system according to claim 7, characterized in that, The discharge pipe is also equipped with a temperature detection device, which is located downstream of the pressure detection device.

9. The pulping system according to any one of claims 1-7, characterized in that, A slag removal device (4) is also connected between the pre-press tower (1) and the disc mill.

10. The pulping system according to claim 9, characterized in that, The pulping system also includes a pre-pump pump (5) and a thickener supply device (6), wherein the pre-pump pump (5) may be selectively connected to at least one of the pre-pump tower (1) and the thickener supply device (6).

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