A hemicellulose dissolving pulp system

Abstract

The utility model discloses a kind of hemicellulose dissolving pulp systems, it is related to xylose liquid production field, including with the dry material output end of filter press butt joint belt conveyor, and the output end butt joint of belt conveyor has storage bin, and the export end of storage bin is equipped with belt scale;It further includes that first grade dissolving pulp tank and second grade dissolving pulp tank are sequentially communicated by material conveying pipe, the both ends of belt scale are respectively butt joint with first grade dissolving pulp tank, second grade dissolving pulp tank, and still parallelly connected with bypass pipeline on material conveying pipe, still be equipped with emulsion pump on bypass pipeline;The acid water input pipe, concentrated sulphuric acid input pipe are all installed on first grade dissolving pulp tank and second grade dissolving pulp tank, still be equipped with material output pipe on second grade dissolving pulp tank, and still be equipped with flowmeter on material output pipe.The utility model can make raw material liquid after pressure filtration hemicellulose dry base can automatically enter dissolving pulp tank and mix with acid water, concentrated sulphuric acid, to realize automatic dissolving pulp, not only dissolving pulp effect is good, and whole process does not need manual participation.

Description

Technical Field

[0001] This utility model relates to the field of xylose syrup production, and more specifically, to a hemicellulose syrup system. Background Technology

[0002] The raw material for viscose fiber production is pulp, which is processed from wood. Wood mainly contains cellulose, hemicellulose, and lignin. Cellulose is the main raw material for viscose fiber production. Therefore, during pulp production, cellulose must be largely retained while lignin and hemicellulose are removed as much as possible. However, due to limitations in the production process, the finished pulp still contains a certain amount of hemicellulose. The presence of hemicellulose during viscose fiber production creates difficulties for impregnation, aging, and xanthation. Furthermore, the presence of hemicellulose in the finished fiber reduces its physical and mechanical properties. To ensure the quality of viscose and the finished fiber, hemicellulose must be dissolved and extracted using alkali during viscose fiber production. The extracted hemicellulose is then processed and utilized to address the environmental issues associated with using hemicellulose pulp. Additionally, selling hemicellulose products can reduce the overall cost of viscose fiber production.

[0003] After hemicellulose is dissolved and extracted with alkali, it needs to be slurried for subsequent use. Therefore, there is an urgent need for a slurry system that can prepare dry hemicellulose. Utility Model Content

[0004] The purpose of this invention is to provide a hemicellulose dissolving system that allows the dry hemicellulose obtained after hydraulic filtration of raw materials to automatically enter the dissolving tank and mix with acid water and concentrated sulfuric acid, thereby achieving automatic dissolving. This not only provides a good dissolving effect, but also eliminates the need for manual intervention throughout the entire process.

[0005] To achieve the purpose of this utility model, the technical solution adopted is as follows: a hemicellulose slurry system, including a belt conveyor connected to the dry material output end of a filter press, and a storage silo connected to the output end of the belt conveyor, with a belt scale installed at the outlet end of the storage silo; it also includes a primary slurry tank and a secondary slurry tank connected sequentially through a material conveying pipe, with the two ends of the belt scale connected to the primary slurry tank and the secondary slurry tank respectively, and a bypass pipe connected in parallel on the material conveying pipe, with an emulsifying pump installed on the bypass pipe; both the primary slurry tank and the secondary slurry tank are equipped with an acid water input pipe and a concentrated sulfuric acid input pipe, and the secondary slurry tank is also equipped with a material output pipe, with a flow meter installed on the material output pipe.

[0006] Furthermore, there are two emulsifying pumps, and a parallel pipeline is connected to the material conveying pipe. The other end of the parallel pipeline is connected between the outlet of the previous emulsifying pump and the inlet of the next emulsifying pump.

[0007] Furthermore, both the primary and secondary slurry tanks are equipped with agitators.

[0008] Furthermore, both the material conveying pipe and the material output pipe are connected to circulation pipes, and the two circulation pipes are respectively connected to the upper part of the primary slurry tank and the secondary slurry tank.

[0009] Furthermore, a material conveying pump is installed on both the material conveying pipe and the material output pipe, and the inlet end of the material conveying pump is connected to the material conveying pipe and the material output pipe through a flexible connector.

[0010] Furthermore, a magnetic filter is also installed at the input end of the material conveying pipe.

[0011] Furthermore, the primary slurry tank and the secondary slurry tank are also connected to process water conveying pipes, and the material conveying pipes and the material output pipes are also connected to sewage discharge pipes.

[0012] Furthermore, level sensors are also installed on the primary and secondary slurry tanks.

[0013] The beneficial effects of this utility model are: In this invention, a belt conveyor, a storage silo, and a belt scale work together to automatically feed the hemicellulose dry base obtained after hydraulic filtration into the primary dissolving tank. Acid water and concentrated sulfuric acid are automatically fed into the primary dissolving tank through acid water inlet pipe and concentrated sulfuric acid inlet pipe, respectively. The hemicellulose dry base, acid water, and concentrated sulfuric acid are mixed in the primary dissolving tank to achieve preliminary dissolution. After the preliminary dissolution is completed, the material is sent to the secondary dissolving tank. Acid water and concentrated sulfuric acid are fed into the secondary dissolving tank through acid water inlet pipe and concentrated sulfuric acid inlet pipe, allowing the slurry after the preliminary dissolution to undergo secondary dissolution. The dissolution effect is good, and the entire process requires no manual intervention. Attached Figure Description

[0014] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification.

[0015] Figure 1 This is a system diagram of the hemicellulose sol system provided by this utility model.

[0016] The attached diagram shows the markings and corresponding component names: 1. Primary slurry tank; 2. Secondary slurry tank; 3. Belt conveyor; 4. Storage silo; 5. Belt scale; 6. Acid water inlet pipe; 7. Concentrated sulfuric acid inlet pipe; 8. Process water inlet pipe; 9. Material inlet pipe; 10. Circulation pipeline; 11. Bypass pipeline; 12. Magnetic filter; 13. Material inlet pump; 14. Emulsifying pump; 15. Agitator; 16. Material outlet pipe; 17. Flow meter; 18. Liquid level sensor; 19. Flexible connector; 20. Drainage pipe; 21. Parallel pipeline. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.

[0018] It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 As shown, the present invention provides a hemicellulose slurry system, including a belt conveyor 3, a storage bin 4, and a belt scale. The input end of the belt conveyor 3 can be directly connected to the dry material outlet of the filter press, and the belt conveyor 3 can also be connected to the output end of the dry material conveying belt of the filter press. The storage bin 4 is used to collect and store the hemicellulose dry material after filtration. The outlet end of the storage bin 4 is connected to the belt scale 5, so that the hemicellulose dry material sent out by the storage bin 4 can automatically enter the belt scale 5. The belt scale 5 can not only transport the hemicellulose dry material, but also weigh the hemicellulose dry material.

[0020] The hemicellulose slurry system also includes a primary slurry tank 1 and a secondary slurry tank 2. Both primary and secondary slurry tanks 1 and 2 are used for slurry processing. The outlet of the primary slurry tank 1 and the inlet of the secondary slurry tank 2 are connected via a material conveying pipe 9, thus connecting the primary and secondary slurry tanks 1 and 2 in series. Simultaneously, the output end of a belt scale 5 is connected to the inlet of the primary slurry tank 1. The forward rotation of the belt scale 5 allows the hemicellulose dry base on the belt scale 5 to be fed into the primary slurry tank 1. In actual operation, after the hemicellulose dry base is slurried in the primary slurry tank 1, it can be conveyed through the material conveying pipe 9 into the secondary slurry tank 2, where slurry processing continues, completing the secondary slurry process.

[0021] To enable the hemicellulose dry base to be mixed with acidic water and concentrated sulfuric acid in the primary dissolving tank 1 and thus break down the hemicellulose in the slurry, a bypass pipe 11 can be connected in parallel to the material conveying pipe 9, and an emulsifying pump 14 can be installed on the bypass pipe 11. When it is necessary to break down the hemicellulose in the slurry prepared in the primary dissolving tank 1, the slurry enters the material conveying pipe 9 and then passes through the bypass pipe 11, where it is crushed by the emulsifying pump 14 before entering the secondary dissolving tank 2. This allows the hemicellulose in the slurry to be broken down during the conveying process, resulting in a better dissolving effect.

[0022] In this invention, to improve the crushing effect of hemicellulose in the slurry, two emulsifying pumps 14 are installed on the bypass pipeline 11. This allows the slurry prepared in the primary dissolving tank 1 to be crushed sequentially by the two emulsifying pumps 14 during transportation, resulting in better crushing of the hemicellulose in the slurry. When the hemicellulose in the slurry prepared in the primary dissolving tank 1 can meet the requirements after being crushed by one emulsifying pump 14, to avoid over-crushing of the slurry prepared in the primary dissolving tank 1 by the two emulsifying pumps 14 during transportation, a parallel pipeline 21 can be connected in parallel on the material conveying pipe 9. The other end of the parallel pipeline 21 is connected to the outlet of the first emulsifying pump 14 or the inlet of the second emulsifying pump 14. When the hemicellulose in the slurry prepared in the primary slurry tank 1 can meet the requirements after being crushed by one emulsifying pump 14, the slurry prepared in the primary slurry tank 1 first enters the bypass pipeline 11 through the material conveying pipe 9, and after passing through the first emulsifying pump on the bypass pipeline 11, it re-enters the outlet end of the material conveying pipe 9 through the parallel pipeline 21, and then directly enters the secondary slurry tank 2; or, when the hemicellulose in the slurry prepared in the primary slurry tank 1 can meet the requirements after being crushed by one emulsifying pump 14, the slurry prepared in the primary slurry tank 1 first enters the parallel pipeline 21 through the material conveying pipe 9, and then enters the second emulsifying pump 14 through the parallel pipeline 21, and after passing through the second emulsifying pump 14, it re-enters the outlet end of the material conveying pipe 99 through the bypass pipeline 11, and then directly enters the secondary slurry tank 2.

[0023] In this utility model, when there are two emulsifying pumps 14 on the bypass pipeline 11, an additional material output pipe 16 can be installed at the outlet end of the material conveying pipe 9.

[0024] In this utility model, in order to facilitate the feeding of acid water and concentrated sulfuric acid into the primary slurry tank 1 and the secondary slurry tank 2 respectively, acid water input pipe 6 and concentrated sulfuric acid input pipe 7 are installed on the top of the primary slurry tank 1 and the secondary slurry tank 2 respectively. The bottom of the secondary slurry tank 2 is also connected to a material output pipe 16. A flow meter 17 is also installed on the material output pipe 16. The flow meter 17 is used to monitor the flow rate of the slurry passing through the material output pipe 16.

[0025] To ensure that the concentrated sulfuric acid, hemicellulose dry base, and acid water fed into the primary slurry tank 1 are fully mixed, an agitator 15 is installed in the primary slurry tank 1; at the same time, to ensure that the slurry fed into the secondary slurry tank 2 can be fully mixed with the concentrated sulfuric acid and acid water again, an agitator 15 is also installed in the secondary slurry tank 2.

[0026] To improve the mixing effect of concentrated sulfuric acid, hemicellulose dry base, and acid water in the primary slurry tank 1, a circulation pipe 10 is also connected to the material conveying pipe 9. The other end of the circulation pipe 10 is connected to the upper part of the primary slurry tank 1, so that while the concentrated sulfuric acid, hemicellulose dry base, and acid water are mixed in the primary slurry tank 1, the slurry at the bottom of the primary slurry tank 1 can be pumped to the upper part of the primary slurry tank 1, causing the slurry to tumble in the primary slurry tank 1. Similarly, to improve the mixing effect of the slurry with concentrated sulfuric acid and acid water in the secondary slurry tank 2, a circulation pipe 10 is also connected to the material output pipe 16. The other end of the circulation pipe 10 is connected to the upper part of the secondary slurry tank 2, so that while the slurry with concentrated sulfuric acid and acid water is mixed in the secondary slurry tank 2, the slurry at the bottom of the secondary slurry tank 2 can be pumped to the upper part of the secondary slurry tank 2, causing the slurry to tumble in the secondary slurry tank 2.

[0027] To facilitate the transportation of the slurry after slurry treatment in the primary slurry tank 1 and the secondary slurry tank 2, material conveying pumps 13 are installed on both the material conveying pipe 9 and the material output pipe 16. In order to avoid the vibration of the material conveying pump 13 from affecting the material conveying pipe 9 and the material output pipe 16, the inlet end of the material conveying pump 13 can be connected to the material conveying pipe 9 and the material output pipe 16 by a flexible connector 19. The flexible connector 19 can not only compensate for thermal expansion and contraction and multi-directional displacement, but also play a role in vibration reduction and noise reduction.

[0028] To avoid magnetic metal impurities in the slurry after melting treatment, a magnetic filter 12 is installed at the input end of the material conveying pipe 9. This allows the magnetic filter 12 to filter out magnetic metal impurities in the slurry while it is being conveyed through the material conveying pipe 9. This process completes the slurry filtration without affecting the melting treatment, ensuring both slurry filtration and melting efficiency.

[0029] To facilitate subsequent cleaning of the primary slurry tank 1 and the secondary slurry tank 2, process water delivery pipes 8 are connected to both primary slurry tank 1 and secondary slurry tank 2. When cleaning is required, process water can be delivered to the primary slurry tank 1 and secondary slurry tank 2 through the process water delivery pipes 8 for cleaning. To facilitate the discharge of wastewater after cleaning the primary slurry tank 1 and secondary slurry tank 2, sewage pipes 20 are connected in parallel to both the material delivery pipe 9 and the material output pipe 16. Wastewater after cleaning the primary slurry tank 1 and secondary slurry tank 2 can be discharged through the sewage pipes 20.

[0030] To facilitate the monitoring of the liquid level in the primary slurry tank 1 and the secondary slurry tank 2, liquid level sensors 18 are installed on both the primary slurry tank 1 and the secondary slurry tank 2.

[0031] In this utility model, in order to facilitate the control of the feeding of concentrated sulfuric acid, acid water, and process water into the primary slurry tank 1 and the secondary slurry tank 2, and in order to facilitate the control of the conveying of the slurry after slurry treatment, pneumatic valves, ball valves, shut-off valves, etc. can be selected and equipped on the acid water input pipe 6, concentrated sulfuric acid input pipe 7, process water conveying pipe 8, material conveying pipe 9, bypass pipe 11, sewage pipe 20, and material output pipe 16 as needed.

[0032] During normal operation of the filter press, the hemicellulose dry base discharged from the dry material outlet of the filter press falls onto the belt conveyor 3. Through the operation of the belt conveyor 3, the hemicellulose dry base is sent into the storage silo 4. When slurry treatment is required, the hemicellulose dry base in the storage silo 4 is transported to the belt scale 5. After being weighed by the belt scale 5, the belt scale 5 transports the hemicellulose dry base to the primary slurry tank 1. At the same time, concentrated sulfuric acid is sent into the primary slurry tank 1 through the concentrated sulfuric acid input pipe 7, and acid water is sent into the primary slurry tank 1 through the acid water input pipe 6. Then, the agitator 15 in the primary slurry tank 1 is started, and the material conveying pump 13 on the material conveying pipe 9 is started. The agitator 15 fully mixes the hemicellulose dry base, concentrated sulfuric acid, and acid water. The material conveying pump 13 pumps the slurry at the bottom of the primary slurry tank 1 through the material conveying pipe 9 and the circulation pipe 10 to the upper part of the primary slurry tank 1, so that the hemicellulose dry base, concentrated sulfuric acid, and acid water are fully mixed in the primary slurry tank 1.

[0033] After the slurry in the primary slurry tank 1 is processed, the circulation pipeline 10 is closed, and the two emulsification pumps 14 are started. The slurry in the primary slurry tank 1 passes through the material conveying pipe 9 and the bypass pipeline 11. During the process of passing through the material conveying pipe 9 and the bypass pipeline 11, the two emulsification pumps 14 on the bypass pipeline 11 pulverize the hemicellulose in the slurry before it enters the outlet end of the material conveying pipe 9 and finally enters the secondary slurry tank 2. At the same time, concentrated sulfuric acid is introduced through the concentrated sulfuric acid input pipe 7. The acid water is fed into the secondary slurry tank 2 through the acid water inlet pipe 6. Then, the agitator 15 in the secondary slurry tank 2 is started, and the material conveying pump 13 on the material outlet pipe 16 is started. The agitator 15 fully mixes the slurry, concentrated sulfuric acid, and acid water. The material conveying pump 13 pumps the slurry at the bottom of the secondary slurry tank 2 through the material outlet pipe 16 and the circulation pipe 10 to the upper part of the secondary slurry tank 2, so that the slurry, concentrated sulfuric acid, and acid water are fully mixed in the secondary slurry tank 2.

[0034] After the slurry treatment in the secondary slurry tank 2 is completed, the circulation pipeline 10 is closed, and the slurry after the slurry treatment in the secondary slurry tank 2 is transported to the next process through the material output pipe 16.

[0035] When it is necessary to clean the primary slurry tank 1 and the secondary slurry tank 2, process water is supplied to the primary slurry tank 1 and the secondary slurry tank 2 through the process water delivery pipe. The process water is used to rinse the primary slurry tank 1 and the secondary slurry tank 2. After the primary slurry tank 1 and the secondary slurry tank 2 are rinsed, the wastewater after rinsing enters the material delivery pipe 9 and the material output pipe 16 respectively, and is discharged through the sewage pipe 20 connected to the material delivery pipe 9 and the material output pipe 16.

[0036] Those skilled in the art should understand that the above embodiments are merely for clearly illustrating the present invention and are not intended to limit the scope of the present invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A hemicellulose sol system, characterized in that, The system includes a belt conveyor (3) connected to the dry material output end of the filter press, and a storage bin (4) connected to the output end of the belt conveyor (3). A belt scale is installed at the outlet end of the storage bin (4). The system also includes a primary slurry tank (1) and a secondary slurry tank (2) connected in sequence through a material conveying pipe (9). The two ends of the belt scale are connected to the primary slurry tank (1) and the secondary slurry tank (2) respectively. A bypass pipe (11) is also connected in parallel on the material conveying pipe (9). An emulsifying pump (14) is also installed on the bypass pipe (11). An acid water input pipe (6) and a concentrated sulfuric acid input pipe (7) are installed on both the primary slurry tank (1) and the secondary slurry tank (2). A material output pipe (16) is also installed on the secondary slurry tank (2). A flow meter (17) is also installed on the material output pipe (16).

2. The hemicellulose sol system according to claim 1, characterized in that, There are two emulsifying pumps (14), and a parallel pipeline (21) is connected in parallel on the material conveying pipe (9). The other end of the parallel pipeline (21) is connected between the outlet of the previous emulsifying pump (14) and the inlet of the next emulsifying pump (14).

3. The hemicellulose sol system according to claim 2, characterized in that, Both the primary slurry tank (1) and the secondary slurry tank (2) are equipped with a stirrer (15).

4. The hemicellulose sol system according to claim 2, characterized in that, Both the material conveying pipe (9) and the material output pipe (16) are connected to circulation pipes (10), and the two circulation pipes (10) are respectively connected to the upper part of the primary slurry tank (1) and the secondary slurry tank (2).

5. The hemicellulose sol system according to claim 2, characterized in that, Material conveying pumps (13) are installed on both the material conveying pipe (9) and the material output pipe (16), and the inlet end of the material conveying pump (13) is connected to the material conveying pipe (9) and the material output pipe (16) through a flexible connector (19).

6. The hemicellulose sol system according to claim 2, characterized in that, A magnetic filter (12) is also installed at the input end of the material conveying pipe (9).

7. The hemicellulose sol system according to claim 2, characterized in that, The primary slurry tank (1) and the secondary slurry tank (2) are also connected to process water conveying pipes (8), and the material conveying pipe (9) and the material output pipe (16) are also connected to sewage pipes (20).

8. The hemicellulose sol system according to claim 2, characterized in that, The primary slurry tank (1) and the secondary slurry tank (2) are also equipped with level sensors (18).

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