A shortable continuous centrifugal washing system

Abstract

The utility model discloses a continuous centrifugal washing system that can be short circuited, which comprises a raw material tank, the raw material tank is connected with a first centrifuge through a first feeding pipe, the first centrifuge is connected with a first washing tank through a first discharging pipe, the first washing tank is connected with a second centrifuge, the second centrifuge is connected with a second washing tank through a second discharging pipe, the second washing tank is connected with a third centrifuge, the third centrifuge is connected with a third washing tank through a third discharging pipe, the third washing tank is connected with a fourth centrifuge, the fourth centrifuge is connected with a fourth washing tank through a fourth discharging pipe, the fourth washing tank is connected with a fifth centrifuge, the fifth centrifuge is connected with a dryer through a fifth discharging pipe, the middle part of the second feeding pipe, the third feeding pipe, the fourth feeding pipe and the fifth feeding pipe is connected with a short circuit pipe, when the second, third and fourth centrifuges malfunction, any one of the centrifugal washing can be short circuited, so that the washing system can continue to run.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, specifically to a continuous centrifugal washing system that can be short-circuited. Background Technology

[0002] In chemical production processes, continuous centrifugal washing systems are widely used for the separation and purification of high-viscosity materials (such as cellulose ether slurries). Multi-stage continuous countercurrent centrifugal washing systems achieve gradual purification of materials by connecting multiple centrifuges in series, and have advantages such as high washing efficiency and low solvent consumption. However, this type of system has a significant drawback: because the equipment at each stage is closely connected in series, if any centrifuge at any stage fails (such as mechanical failure, blockage, or maintenance needs), the entire system will be forced to shut down, resulting in production interruption, reduced efficiency, increased energy consumption, and even affecting the stability of product quality.

[0003] In the existing technology, the measures to deal with centrifuge failures are mostly to shut down for maintenance or to activate backup equipment. The former leads to production losses, while the latter requires additional investment and increases system complexity, which is neither economical nor flexible. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, this utility model provides a continuous centrifugal washing system that can be short-circuited, which solves the problem of downtime caused by equipment failure in multi-stage continuous centrifugal washing.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A continuously centrifugal washing system with short-connectability is provided, comprising a raw material tank connected to a primary centrifuge via a primary feed pipe, the primary centrifuge connected to a primary washing tank via a primary discharge pipe, the primary washing tank connected to a secondary centrifuge via a primary transfer pump and a secondary feed pipe; the secondary centrifuge connected to the secondary washing tank via a secondary discharge pipe, the secondary washing tank connected to a tertiary centrifuge via a secondary transfer pump and a tertiary feed pipe; the tertiary centrifuge connected to the tertiary washing tank via a tertiary discharge pipe, the tertiary washing tank connected to a tertiary centrifuge via a tertiary transfer pump and a quaternary feed pipe; the tertiary centrifuge connected to the tertiary washing tank via a tertiary discharge pipe, the tertiary washing tank connected to a tertiary centrifuge via a tertiary transfer pump and a quintic feed pipe; and the tertiary centrifuge connected to a dryer via a quintic discharge pipe; the secondary, tertiary, tertiary, and quintic feed pipes are all connected to short-connector pipes at their midpoints.

[0006] Furthermore, the short connector is connected to the middle sections of the secondary feed pipe, tertiary feed pipe, quaternary feed pipe, and quinary feed pipe respectively through secondary branch pipe, tertiary branch pipe, quaternary branch pipe, and quinary branch pipe, and a secondary short-connection valve, a tertiary short-connection valve, a quaternary short-connection valve, and a quinary short-connection valve are respectively installed on the secondary branch pipe, tertiary branch pipe, quaternary branch pipe, and quinary branch pipe.

[0007] Furthermore, a secondary feed valve is installed at the rear end of the secondary feed pipe, a tertiary first feed valve and a tertiary second feed valve are installed at the front and rear ends of the tertiary feed pipe, a tertiary first feed valve and a tertiary second feed valve are installed at the front and rear ends of the quaternary feed pipe, and a quaternary first feed valve and a quaternary second feed valve are installed at the front end of the quinary feed pipe.

[0008] Furthermore, the liquid phase outlet of the first-stage centrifuge is connected to the waste raw material tank via a first-stage outlet pipe; the liquid phase outlet of the second-stage centrifuge is connected to the waste washing liquid tank via a second-stage outlet pipe; the liquid phase outlet of the third-stage centrifuge is connected to the first-stage washing tank and the waste washing liquid tank via third-stage outlet branch pipes; the liquid phase outlet of the fourth-stage centrifuge is connected to the first-stage washing tank and the second-stage washing tank via fourth-stage outlet branch pipes; the liquid phase outlet of the fifth-stage centrifuge is connected to the second-stage washing tank and the third-stage washing tank via fifth-stage outlet branch pipes; and both the third-stage and fourth-stage washing tanks are connected to the fresh washing liquid tank via inlet branch pipes.

[0009] Furthermore, a secondary outlet valve is installed on the secondary outlet pipe, a tertiary first outlet valve and a tertiary second outlet valve are installed on the two branch pipes of the tertiary outlet branch pipe, a tertiary first outlet valve and a tertiary second outlet valve are installed on the two branch pipes of the quaternary outlet branch pipe, a quaternary first outlet valve and a quaternary second outlet valve are installed on the two branch pipes of the quinary outlet branch pipe, and a quinary first outlet valve and a quinary second outlet valve are installed on the two branch pipes of the inlet branch pipe.

[0010] The beneficial effects of this utility model are as follows: 1. When a secondary, tertiary, or quaternary centrifuge malfunctions, the system can quickly switch processes via a preset short-circuit connection to bypass the faulty equipment, avoiding a complete shutdown and greatly improving the continuity and stability of production. At the same time, the short-circuit operation is convenient and significantly reduces unplanned downtime, thereby improving equipment utilization and overall production efficiency.

[0011] 2. This solution can maintain the process effect of countercurrent washing by adjusting the return liquid path to ensure the liquid volume balance and concentration gradient of each washing tank in short-circuit mode, thereby reducing material loss and maintenance costs and ensuring product quality stability.

[0012] 3. This solution also has multi-level short-circuit capability, adapts to different fault scenarios, is flexible in operation and convenient in maintenance, is suitable for high-requirement continuous production processes, and has broad industrial application prospects. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The above and other objects, features, and advantages of the present invention will become clearer through the drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the main idea of ​​the present utility model.

[0014] Figure 1 This is a schematic diagram of a continuous centrifugal washing system that can be short-circuited.

[0015] The system includes: 1. Raw material tank; 2. Primary feed pipe; 3. Primary centrifuge; 4. Primary discharge pipe; 5. Primary washing tank; 6. Primary transfer pump; 7. Secondary feed pipe; 71. Secondary feed valve; 72. Secondary short-circuit valve; 73. Secondary branch pipe; 8. Secondary centrifuge; 9. Secondary discharge pipe; 10. ... 11. Secondary washing tank; 12. Secondary transfer pump; 13. Tertiary feed pipe; 121. Tertiary first feed valve; 122. Tertiary second feed valve; 123. Tertiary short-circuit valve; 124. Tertiary branch pipe; 13. Tertiary centrifuge; 14. Tertiary discharge pipe; 15. Tertiary washing tank; 16. Tertiary transfer pump; 17. Quaternary feed pipe; 171. Quaternary first feed valve; 172. Quaternary second feed valve; 173. Quaternary short-circuit valve; 174. Quaternary branch pipe; 18. Quaternary centrifuge; 19. Quaternary discharge pipe; 20. Quaternary washing tank; 21. Quaternary transfer pump; 22. Fifth-stage feed pipe; 221. Fifth-stage feed valve; 222. Fifth-stage short-circuit valve; 223. Five-stage branch pipe; 23. Five-stage centrifuge; 24. Five-stage discharge pipe; 25. Dryer; 26. First-stage liquid discharge pipe; 27. Waste raw material liquid tank; 28. Second-stage liquid discharge pipe; 281. Second-stage liquid discharge valve; 29. ​​Waste washing liquid tank; 30. Third-stage liquid discharge pipe; 301. Third-stage first liquid discharge valve; 302. Third-stage second liquid discharge valve; 31. Fourth-stage liquid discharge pipe; 311. Fourth-stage first liquid discharge valve; 312. Fourth-stage second liquid discharge valve; 32. Fifth-stage liquid discharge pipe; 321. Fifth-stage first liquid discharge valve; 322. Fifth-stage second liquid discharge valve; 33. Inlet branch pipe; 331. First inlet valve; 332. Second inlet valve; 34. Fresh washing liquid tank; 35. Short pipe. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] Furthermore, the terms "Level 1" and "Level 2" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0020] like Figure 1 As shown, the continuous centrifugal washing system of this scheme, which can be short-connected, includes a raw material tank 1. The raw material tank 1 is connected to a first-stage centrifuge 3 via a first-stage feed pipe 2. The first-stage centrifuge 3 is connected to a first-stage washing tank 5 via a first-stage discharge pipe 4. The first-stage washing tank 5 is connected to a second-stage centrifuge 8 via a first-stage transfer pump 6 and a second-stage feed pipe 7. The second-stage centrifuge 8 is connected to a second-stage washing tank 10 via a second-stage discharge pipe 9. The second-stage washing tank 10 is connected to a third-stage centrifuge 13 via a second-stage transfer pump 11 and a third-stage feed pipe 12. The third-stage centrifuge 13 is connected to a third-stage discharge pipe... 14 is connected to the three-stage washing tank 15, which is connected to the four-stage centrifuge 18 via the three-stage conveying pump 16 and the four-stage feed pipe 17; the four-stage centrifuge 18 is connected to the four-stage washing tank 20 via the four-stage discharge pipe 19, which is connected to the five-stage centrifuge 23 via the four-stage conveying pump 21 and the five-stage feed pipe 22; the five-stage centrifuge 23 is connected to the dryer 25 via the five-stage discharge pipe 24; the middle parts of the two-stage feed pipe 7, the three-stage feed pipe 12, the four-stage feed pipe 17 and the five-stage feed pipe 22 are all connected to the short pipe 35.

[0021] As an optional implementation, the liquid phase outlet of the first-stage centrifuge 3 is connected to the waste raw material liquid tank 27 via the first-stage liquid outlet pipe 26; the liquid phase outlet of the second-stage centrifuge 8 is connected to the waste washing liquid tank 29 via the second-stage liquid outlet pipe 28; the liquid phase outlet of the third-stage centrifuge 13 is connected to the first-stage washing tank 5 and the waste washing liquid tank 29 via the third-stage liquid outlet branch pipes respectively; the liquid phase outlet of the fourth-stage centrifuge 18 is connected to the first-stage washing tank 5 and the second-stage washing tank 10 via the fourth-stage liquid outlet branch pipes respectively; the liquid phase outlet of the fifth-stage centrifuge 23 is connected to the second-stage washing tank 10 and the third-stage washing tank 15 via the fifth-stage liquid outlet branch pipes respectively; the third-stage washing tank 15 and the fourth-stage washing tank 20 are both connected to the fresh washing liquid tank 34 via the liquid inlet branch pipe 33.

[0022] Specifically, a secondary outlet valve 281 is provided on the secondary outlet pipe 28, a tertiary first outlet valve 301 and a tertiary second outlet valve 302 are respectively provided on the two branch pipes of the tertiary outlet branch pipe, a tertiary first outlet valve 311 and a tertiary second outlet valve 312 are respectively provided on the two branch pipes of the quaternary outlet branch pipe, a quaternary first outlet valve 312 and a quaternary second outlet valve 322 are respectively provided on the two branch pipes of the quinary outlet branch pipe, and a first inlet valve 331 and a second inlet valve 332 are respectively provided on the two branch pipes of the inlet branch pipe 33.

[0023] As an optional implementation, the short-connector 35 is connected to the middle sections of the secondary feed pipe 7, tertiary feed pipe 12, quaternary feed pipe 17, and quinary feed pipe 22 via secondary branch pipe 73, tertiary branch pipe 124, quaternary branch pipe 174, and quinary branch pipe 223, respectively. A secondary short-connection valve 72 and a tertiary short-connection valve are respectively installed on the secondary branch pipe 73, tertiary branch pipe 124, quaternary branch pipe 174, and quinary branch pipe 223. 123. A four-stage short-circuit valve 173 and a five-stage short-circuit valve 222; a two-stage feed valve 71 is provided at the rear of the two-stage feed pipe 7; a three-stage first feed valve 121 and a three-stage second feed valve 122 are provided at the front and rear of the three-stage feed pipe 12; a four-stage first feed valve 171 and a four-stage second feed valve 172 are provided at the front and rear of the four-stage feed pipe 17; and a five-stage feed valve 221 is provided at the front of the five-stage feed pipe 22.

[0024] The operation process of this solution is explained in detail below: 1. During normal operation of this scheme: the slurry in the raw material tank 1 is transported to the first-stage centrifuge 3 via the first-stage feed pipe 2, the first-stage discharge pipe 4 is connected to the first-stage washing tank 5, the first-stage washing tank 5 is connected to the first-stage conveying pump 6, and then connected to the second-stage centrifuge 8 via the second-stage feed pipe 7 and the second-stage feed valve 71; wherein, the liquid phase outlet of the first-stage centrifuge 3 is connected to the waste raw material liquid tank 27 via the first-stage liquid outlet pipe 26; The secondary discharge pipe 9 is connected to the secondary washing tank 10, the secondary washing tank 10 is connected to the secondary transfer pump 11, and then connected to the tertiary centrifuge 13 via the tertiary feed pipe 12 and the tertiary first feed valve 121; wherein, the liquid phase outlet of the secondary centrifuge 8 is connected to the waste washing liquid tank 29 via the secondary liquid outlet pipe 28 and the secondary liquid outlet valve 281. The third-stage discharge pipe 14 is connected to the third-stage washing tank 15, the third-stage washing tank 15 is connected to the third-stage conveying pump 16, and then connected to the fourth-stage centrifuge 18 via the fourth-stage feed pipe 17 and the fourth-stage first feed valve 171; wherein, the liquid phase outlet of the third-stage centrifuge 13 is connected to the first-stage washing tank 5 via the third-stage liquid outlet pipe 30 and the third-stage first liquid outlet valve 301. The fourth-stage discharge pipe 19 is connected to the fourth-stage washing tank 20, the fourth-stage washing tank 20 is connected to the fourth-stage conveying pump 21, and then connected to the fifth-stage centrifuge 23 via the fifth-stage feed pipe 22 and the fifth-stage feed valve 221; wherein, the liquid phase outlet of the fourth-stage centrifuge 18 is connected to the second-stage washing tank 10 via the fourth-stage liquid outlet pipe 31 and the fourth-stage first liquid outlet valve 311. The fifth-stage discharge pipe 24 is connected to the dryer 25. The liquid phase outlet of the fifth-stage centrifuge 23 is connected to the raw material third-stage washing liquid tank via the fifth-stage liquid outlet pipe 32 and the fifth-stage first liquid outlet valve 312. The fresh washing liquid in the fresh washing liquid tank 34 enters the fourth-stage washing tank 20 via the liquid inlet branch pipe 33 and the first liquid inlet valve 331. In the normal operating procedure, the following valves are opened during implementation: secondary feed valve 71, tertiary first feed valve 121, tertiary second feed valve 122, quaternary first feed valve 171, quaternary second feed valve 172, quinary feed valve 221, secondary outlet valve 281, tertiary first outlet valve 301, quaternary first outlet valve 311, quinary first outlet valve 312, and first inlet valve 331; secondary short-circuit valve 72 and tertiary short-circuit valve 123 are closed. The four-stage short-circuit valve 173, the five-stage short-circuit valve 222, the three-stage second outlet valve 302, the four-stage second outlet valve 312, the five-stage second outlet valve 322, and the second inlet valve 332 are connected. Then, the first-stage centrifuge 3, the second-stage centrifuge 8, the third-stage centrifuge 13, the fourth-stage centrifuge 18, and the fifth-stage centrifuge 23 are turned on in sequence. Then, the first-stage transfer pump 6, the second-stage transfer pump 11, the third-stage transfer pump 16, the fourth-stage transfer pump 21, and the fifth-stage transfer pump are turned on in sequence.

[0025] 2. In this scheme, when the secondary centrifuge 8 is short-circuited: the secondary feed pipe 7 is connected to the tertiary centrifuge 13 through the secondary branch pipe 73 and the short-circuit pipe 35; the tertiary outlet pipe 30 is connected to the waste washing tank 29; and the quaternary outlet pipe 31 is connected to the primary washing tank 5. In specific implementation, the secondary short-circuit valve 72, the tertiary short-circuit valve 123, the tertiary second outlet valve 302, and the quaternary second outlet valve 312 are opened, while the secondary feed valve 71, the tertiary first feed valve 121, the secondary outlet valve 281, the tertiary first outlet valve 301, the quaternary first outlet valve 311, the secondary centrifuge 8, and the secondary transfer pump 11 are closed.

[0026] 3. In this scheme, when the three-stage centrifuge 13 is short-circuited: the three-stage feed pipe 12 is connected to the four-stage centrifuge 18 through the three-stage branch pipe 124 and the short-circuit pipe 35; the four-stage liquid outlet pipe 31 is connected to the first-stage washing tank; and the five-stage liquid outlet pipe 32 is connected to the second-stage washing tank 10. In specific implementation, the three-stage short-circuit valve 123, the four-stage short-circuit valve 173, the four-stage second liquid outlet valve 312, and the five-stage second liquid outlet valve 322 are opened, while the three-stage second feed valve 122, the four-stage first feed valve 171, the three-stage first liquid outlet valve 301, the four-stage first liquid outlet valve 311, the five-stage second liquid outlet valve 322, the three-stage centrifuge 13, and the three-stage transfer pump 16 are closed.

[0027] 4. In this scheme, when the fourth-stage centrifuge 18 is short-circuited: the fourth-stage feed pipe 17 is connected to the fifth-stage centrifuge 23 through the fourth-stage branch pipe 174 and the short-circuit pipe 35; the fifth-stage outlet pipe 32 is connected to the second-stage washing tank; and the inlet branch pipe 33 is connected to the third-stage washing tank 15. In specific implementation, the fourth-stage short-circuit valve 173, the fifth-stage short-circuit valve 222, the fifth-stage second outlet valve 322 and the second inlet valve 332 are opened, and the fourth-stage second feed valve 172, the fifth-stage feed valve 221, the fourth-stage first outlet valve 311, the fifth-stage first outlet valve 312, the first inlet valve 331, the fourth-stage centrifuge 18 and the fourth-stage transfer pump 21 are closed.

[0028] In summary, when the secondary centrifuge 8, tertiary centrifuge 13, or quaternary centrifuge 18 malfunctions, the system can quickly switch processes via the preset short-circuit pipe 35, bypassing the faulty equipment and avoiding a complete shutdown, greatly improving the continuity and stability of production. Simultaneously, this solution can adjust the return liquid path to ensure the liquid volume balance and concentration gradient of each washing tank in short-circuit mode, thereby maintaining the countercurrent washing process effect, reducing material loss and maintenance costs, and ensuring product quality stability. Furthermore, this solution has multi-stage short-circuit capability, adapting to different fault scenarios, offering flexible operation and convenient maintenance, making it suitable for demanding continuous production processes and possessing broad industrial application prospects.

[0029] Although the specific embodiments of the utility model have been described in detail with reference to the accompanying drawings, they should not be construed as limiting the scope of protection of this patent; various modifications and variations that can be made by those skilled in the art without inventive effort within the scope described in the claims are still within the scope of protection of this patent.

Claims

1. A continuously centrifugal washing system that can be short-circuited, characterized in that, It includes a raw material tank (1), which is connected to a first-stage centrifuge (3) through a first-stage feed pipe (2), and the first-stage centrifuge (3) is connected to a first-stage washing tank (5) through a first-stage discharge pipe (4). The first-stage washing tank (5) is connected to a second-stage centrifuge (8) through a first-stage conveying pump (6) and a second-stage feed pipe (7). The secondary centrifuge (8) is connected to the secondary washing tank (10) through the secondary discharge pipe (9), and the secondary washing tank (10) is connected to the tertiary centrifuge (13) through the secondary transfer pump (11) and the tertiary feed pipe (12). The three-stage centrifuge (13) is connected to the three-stage washing tank (15) through the three-stage discharge pipe (14), and the three-stage washing tank (15) is connected to the four-stage centrifuge (18) through the three-stage transfer pump (16) and the four-stage feed pipe (17). The four-stage centrifuge (18) is connected to the four-stage washing tank (20) through the four-stage discharge pipe (19), and the four-stage washing tank (20) is connected to the five-stage centrifuge (23) through the four-stage conveying pump (21) and the five-stage feed pipe (22). The five-stage centrifuge (23) is connected to the dryer (25) through a five-stage discharge pipe (24); The middle sections of the secondary feed pipe (7), tertiary feed pipe (12), quaternary feed pipe (17) and quinary feed pipe (22) are all connected to the short pipe (35).

2. The continuously centrifugal washing system that can be short-circuited according to claim 1, characterized in that, The short pipe (35) is connected to the middle section of the secondary feed pipe (7), the tertiary feed pipe (124), the quaternary feed pipe (174), and the quinary feed pipe (223) through the secondary branch pipe (73), the tertiary branch pipe (124), the quaternary branch pipe (174), and the quinary branch pipe (223), respectively. The secondary branch pipe (73), the tertiary branch pipe (124), the quaternary branch pipe (174), and the quinary branch pipe (223) are respectively equipped with a secondary short-connection valve (72), a tertiary short-connection valve (123), a quaternary short-connection valve (173), and a quinary short-connection valve (222).

3. The continuously centrifugal washing system that can be short-circuited according to claim 2, characterized in that, The rear section of the secondary feed pipe (7) is provided with a secondary feed valve (71), the front and rear sections of the tertiary feed pipe (12) are respectively provided with a tertiary first feed valve (121) and a tertiary second feed valve (122), the front and rear sections of the quaternary feed pipe (17) are respectively provided with a quaternary first feed valve (171) and a quaternary second feed valve (172), and the front section of the quinary feed pipe (22) is provided with a quinary feed valve (221).

4. The continuously centrifugal washing system that can be short-circuited according to claim 1, characterized in that, The liquid phase outlet of the first-stage centrifuge (3) is connected to the waste raw material liquid tank (27) through the first-stage liquid outlet pipe (26); the liquid phase outlet of the second-stage centrifuge (8) is connected to the waste washing liquid tank (29) through the second-stage liquid outlet pipe (28); the liquid phase outlet of the third-stage centrifuge (13) is connected to the first-stage washing tank (5) and the waste washing liquid tank (29) through the third-stage liquid outlet branch pipe (30); the liquid phase outlet of the fourth-stage centrifuge (18) is connected to the first-stage washing tank (5) and the second-stage washing tank (10) through the fourth-stage liquid outlet branch pipe (31); the liquid phase outlet of the fifth-stage centrifuge (23) is connected to the second-stage washing tank (10) and the third-stage washing tank (15) through the fifth-stage liquid outlet branch pipe (32); the third-stage washing tank (15) and the fourth-stage washing tank (20) are both connected to the fresh washing liquid tank (34) through the liquid inlet branch pipe (33).

5. The continuously centrifugal washing system that can be short-circuited according to claim 4, characterized in that, The secondary outlet pipe (28) is equipped with a secondary outlet valve (281). The two branches of the tertiary outlet branch pipe (30) are respectively equipped with a tertiary first outlet valve (301) and a tertiary second outlet valve (302). The two branches of the quaternary outlet branch pipe (31) are respectively equipped with a quaternary first outlet valve (311) and a quaternary second outlet valve (312). The two branches of the quinary outlet branch pipe (32) are respectively equipped with a quinary first outlet valve (321) and a quinary second outlet valve (322). The two branches of the inlet branch pipe (33) are respectively equipped with a first inlet valve (331) and a second inlet valve (332).

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