A pulp mechanical pressurization preparation system

Abstract

A kind of paper pulp mechanical pressurization preparation system, the system includes pulper, cooking device, washing device, screening device, bleaching device, concentration device, pulper, cooking device, pulp filter press, washing device, screening device, bleaching device and concentration device are sequentially connected installation, washing device is made of three to five stage washing machine, wherein still including pulp filter press;Pulp filter press is connected and installed at the rear end of cooking device or the front end of any stage washing machine in the first three stages of washing device.The system of the utility model improves the pulp yield of paper pulp pulping, wood raw material conversion rate, environmental protection and the quality and value of paper pulp.

Description

Technical Field

[0001] This utility model belongs to the field of pulp preparation and production technology, and in particular relates to a pulp mechanical pressurization preparation system. Background Technology

[0002] The industrial production of pulp using chemical pulping processes with wood chips as raw materials generally involves major processes such as crushing, chemical cooking, washing, screening, bleaching, and concentration. However, if chemimechanical pulping processes are used, there is an additional pulping process after the chemical cooking process and before the washing process.

[0003] The two pulping processes mentioned above each have their advantages and disadvantages. The advantages of chemical pulping are long pulp fibers, high paper strength, and suitability for processing high-grade paper products. The disadvantage is that because it relies entirely on chemical soaking to decompose and dissolve lignin to separate fibers, the pulp yield is only 40% to 50%, and the amount of chemical solution used is large, recycling is difficult, and there are significant environmental risks. The advantages of chemimechanical pulping are high pulp yield, which can reach 80% to 90%, relatively less chemical solution used, relatively easier recycling, and relatively better environmental performance. The disadvantage is that due to the mechanical pulping process, energy consumption is high, fibers are severely damaged, fiber length is short, and paper strength is low, making it suitable for processing low-grade paper products.

[0004] In both of the above pulping processes, if a certain step is added before washing the pulp after cooking in the chemical pulping process, most of the chemical solution can be separated from the pulp to improve the recovery efficiency of the chemical solution. At the same time, washing water consumption is reduced and washing efficiency is increased, thus improving the environmental friendliness of the process. Moreover, while minimizing fiber shearing, the lignin structure between fibers can be destroyed as much as possible. Through washing and screening, more fibers can be separated more easily and more purely, thus increasing the pulp yield. If this step is also added before refining the pulp after cooking in the chemimechanical pulping process, most of the chemical solution can be separated from the pulp before cooking. This can also reduce the hardness of the pulp, reduce the difficulty and time of refining, thus reducing energy consumption, minimizing fiber length damage, and improving the quality of the produced pulp. At the same time, washing water consumption is reduced and washing efficiency is increased, thus further improving the environmental friendliness of the process.

[0005] According to statistics and publicly available data, China's annual pulp production alone is close to 90 million tons. Therefore, by combining existing chemical pulping and chemimechanical pulping processes and innovating by adding certain process steps to achieve the aforementioned process efficiency, the pulp and paper industry will have enormous potential for cost reduction and quality improvement, and will also make a significant contribution to energy conservation, carbon reduction, green and low-carbon transformation of the social economy, and better achievement of the "dual carbon" goals. Utility Model Content

[0006] The purpose of this invention is to provide a mechanical pressurization system for pulp preparation, and the technical problem to be solved is to improve the pulp yield, wood raw material conversion rate, environmental friendliness, and pulp quality and value.

[0007] The purpose of this utility model and the technical problem it solves are achieved by the following technical solution. A pulp mechanical pressurization preparation system according to this utility model includes a pulper, a cooking device, a washing device, a screening device, a bleaching device, and a thickening device. The pulper, cooking device, washing device, screening device, bleaching device, and thickening device are sequentially connected and installed. The washing device consists of three to five stages of washing machines. The pulp filter press is connected and installed at the rear end of the cooking device or the spray chamber, and at the front end of the refiner or any of the first three stages of washing machines in the washing device.

[0008] As an optional embodiment of this utility model, the pulp mechanical pressurization preparation system further includes a spray chamber, and the pulp filter press is connected and installed at the rear end of the cooking device or the spray chamber and at the front end of any of the first three stage washers of the washing device.

[0009] As an optional embodiment of this utility model, the pulp mechanical pressurization preparation system further includes a pulp refiner, and the pulp filter press is connected and installed at the rear end of the cooking device and at the front end of any one of the three stages of the washing device, either the pulp refiner or the washing device.

[0010] As an optional embodiment of this utility model, the pulp mechanical pressurization preparation system further includes a spray chamber and a refiner. The pulp filter press is connected and installed at the rear end of the cooking device or the spray chamber, and at the front end of any one of the first three stages of the refiner or the washing device.

[0011] As an optional embodiment of this utility model, the pulp filter press in the aforementioned pulp mechanical pressurization preparation system includes a filter press frame, a pulp distribution device, a filter cloth, a filter cloth traction device, a pulp filter press plate, and a pulp hydraulic device. The pulp distribution device, the filter cloth traction device, and the pulp hydraulic device are connected and installed on the filter press frame. The pulp filter press plate is installed on the pulp hydraulic device. The filter cloth is wound around and movably connected to the filter cloth traction device and passes through the pulp filter press plate.

[0012] As an optional embodiment of this utility model, the aforementioned pulp mechanical pressurization preparation system further includes a pulp flake crushing device; the pulp flake crushing device is connected and installed at the rear end of the pulp filter press and the front end of the washing device.

[0013] As an optional embodiment of this utility model, the aforementioned pulp mechanical pressurization preparation system further includes a pulp flake crushing device; the pulp flake crushing device is connected and installed at the rear end of the pulp filter press, the washing device, or the front end of the refiner.

[0014] As an optional embodiment of this utility model, the aforementioned pulp mechanical pressurization preparation system further includes a solid-liquid pre-separation device; the solid-liquid pre-separation device is connected and installed at the rear end of the cooking device and the front end of the pulp filter press.

[0015] As an optional embodiment of this utility model, the aforementioned pulp mechanical pressurization preparation system further includes a solid-liquid pre-separation device; the solid-liquid pre-separation device is connected and installed at the rear end of the cooking device or the spray chamber and at the front end of the pulp filter press.

[0016] As an optional embodiment of this utility model, the pulp flake crushing device in the aforementioned pulp mechanical pressurization preparation system includes a double-roller shredder and / or a twin-screw conveyor, a chain crusher or a blade / hammer crusher, and a paddle mixer.

[0017] As an optional embodiment of this utility model, the solid-liquid pre-separation device in the aforementioned pulp mechanical pressurization preparation system is a belt separator or a spiral screen separator.

[0018] This invention has significant advantages and beneficial effects compared with the prior art. Through the above technical solution, the mechanical pressurization pulp preparation system of this invention has at least one of the following advantages and beneficial effects:

[0019] Firstly, it can improve the pulp yield of wood chips in chemical pulping processes;

[0020] Secondly, it can effectively reduce the difficulty, time and energy consumption of pulping in the chemimechanical pulping process;

[0021] Third, it can reduce one to two stages of washing, significantly improve the recovery efficiency of black liquor, and reduce pulp washing water and washing time, thus improving the environmental friendliness of the pulp and paper industry.

[0022] Fourth, it is more conducive to the separation of fibers from lignin and other impurities, resulting in a higher fiber splitting rate, significantly reducing fiber bundles and improving fiber quality, which is beneficial to improving the folding endurance and strength of the paper.

[0023] Fifth, it significantly improves the conversion rate of papermaking raw materials such as wood, reduces the consumption of forest resources, and greatly reduces the overall production cost. This can effectively promote energy conservation, carbon reduction, cost reduction, quality improvement, efficiency enhancement, and green transformation and upgrading of the pulp and paper industry, and better help society achieve its "dual carbon" goals.

[0024] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0025] Figure 1 This is a front view schematic diagram of the structure of Embodiment 1 of this utility model.

[0026] Figure 2 This is a front view schematic diagram of the structure of Embodiment 2 of this utility model.

[0027] Figure 3 This is a front view schematic diagram of the structure of Embodiment 3 of this utility model.

[0028] Figure 4 This is a front view schematic diagram of the structure of Embodiment 4 of this utility model.

[0029] Figure 5 This is a front view schematic diagram of the structure of Embodiment 5 of this utility model.

[0030] Figure 6 This is a front view schematic diagram of the structure of Embodiment Six of this utility model.

[0031] Explanation of icon numbers

[0032] 1: Pulping machine 2: Cooking unit

[0033] 3: Discharge chamber; 4: Solid-liquid pre-separation device

[0034] 41: Belt separator 42: Spiral screen separator

[0035] 5: Slurry Filter Press 51: Filter Press Frame

[0036] 52: Slurry spreading device 53: Filter cloth

[0037] 54: Filter cloth traction device; 55: Slurry filter press plate

[0038] 56: Slurry hydraulic device; 6: Slurry flake crushing device

[0039] 61: Double Roller Shredder 62: Twin Screw Conveyor

[0040] 63: Chain crusher 64: Blade / hammer crusher

[0041] 65: Paddle mixer 7: Pulverizer

[0042] 8: Washing device 81: First stage washing machine

[0043] 82: Second-stage washing machine 83: Third-stage washing machine

[0044] 84: Fourth-stage washing machine 85: Fifth-stage washing machine

[0045] 9: Screening device; 10: Bleaching device

[0046] 11: Concentration Unit Detailed Implementation

[0047] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation methods, structures, features, and effects of the pulp mechanical pressurization preparation system and preparation method proposed according to this utility model.

[0048] Example 1:

[0049] Please see Figure 1 As shown, the pulp mechanical pressurization preparation system of Embodiment 1 of this utility model mainly consists of a pulper 1, a cooking device 2, a pulp filter press 5, a washing device 8, a screening device 9, a bleaching device 10, and a thickening device 11. The pulper 1, the cooking device 2, the pulp filter press 5, the washing device 8, the screening device 9, the bleaching device 10, and the thickening device 11 are connected and installed in sequence. The washing device 8 consists of a three-stage washing machine. The pulp filter press 5 is connected and installed at the rear end of the cooking device 2 and at the front end of the first-stage washing machine 81 of the washing device 8.

[0050] The slurry filter press 5 mainly consists of a filter press frame 51, a slurry feeding device 52, a filter cloth 53, a filter cloth traction device 54, slurry filter plates 55, and a slurry hydraulic device 56. The slurry feeding device 52, the filter cloth traction device 54, and the slurry hydraulic device 56 are connected and installed on the filter press frame 51. The slurry filter plates 55 are installed on the slurry hydraulic device 56. The filter cloth is wound around and movably connected to the filter cloth traction device 54, passing through the spaces between the slurry filter plates 55. There are 10 slurry filter plates 55, vertically connected and installed between the lower base and the slider of the slurry hydraulic device 56. In practical applications, the number of slurry filter plates 55 can be increased or decreased according to the required filtration efficiency.

[0051] Example 2:

[0052] Please see Figure 2 As shown, the pulp mechanical pressurization preparation system of Embodiment 2 of this utility model is similar to that of Embodiment 1, with the only difference being:

[0053] To further enhance the system's production buffer capacity and continuity, a spray chamber 3 is added and installed at the rear end of the cooking device 2. After the slurry is cooked in the cooking device 2, it is first quickly sprayed into the spray chamber 3, and then the spray chamber 3 is evenly conveyed into the slurry filter press 5 at the rear end for filtration.

[0054] If the pulp discharged from the cooking device 2 has a low solids content, a solid-liquid pre-separation device 4 is added to further improve the processing capacity of the pulp mechanical pressurization preparation system. The solid-liquid pre-separation device 4 is a belt separator 41 or a spiral screen separator 42, which is connected and installed at the rear end of the spray chamber 3 and the front end of the pulp filter press 5. The pulp with a low solids content undergoes solid-liquid pre-separation through the belt separator 41 or spiral screen separator 42 to increase the solids content before being discharged into the pulp filter press 5 for pressing and filtration, further separating the black liquor in the pulp, and at the same time squeezing and destroying the lignin structure between the fibers.

[0055] The slurry filter press 5 is connected and installed between the second-stage washer 82 and the third-stage washer 83 of the washing device 8.

[0056] To further increase the contact area between the slurry and the washing water and improve washing efficiency, a slurry flake crushing device 6 is added and installed. The slurry flake crushing device 6 is connected and installed at the rear end of the slurry filter press 5 and the front end of the washing device 8. The slurry flake crushing device 6 is composed of a double roller shredder 61 and / or a twin screw conveyor 62 and a chain crusher 63 connected and installed in sequence. The slurry flakes after being filtered by the slurry filter press 5 are conveyed into the double roller shredder 61 and shredded into small pieces. Then, they are conveyed by the twin screw conveyor 62 into the chain crusher 63 for further crushing and dispersing, and then conveyed into the washing device 8 at the rear end for washing.

[0057] Example 3:

[0058] Please see Figure 3 As shown, the pulp mechanical pressurization preparation system of Embodiment 3 of this utility model is similar to that of Embodiment 1, with the only difference being:

[0059] In the chemimechanical pulping process, the pulp needs to be ground, so a refiner 7 is installed. The refiner 7 is connected to the rear end of the pulp filter press 5 and the front end of the washing device 8. In pulp preparation and production, after the pulp completes the cooking reaction in the cooking device 2 and the solid-liquid separation by the pulp filter press 5, it is ground and refined by the refiner 7 before being sent to the washing device 8 for washing.

[0060] The slurry crushing device 6 consists of the twin-screw conveyor 62 and the blade / hammer crusher 64.

[0061] Example 4:

[0062] Please see Figure 4 As shown, the pulp mechanical pressurization preparation system of Embodiment 4 of this utility model is similar to that of Embodiment 2, with the only difference being:

[0063] The slurry fragment crushing device 6 consists of the twin-screw conveyor 62 and the paddle mixer 65.

[0064] Example 5:

[0065] Please see Figure 5 As shown, the pulp mechanical pressurization preparation system of Embodiment 5 of this utility model is similar to that of Embodiment 1, with the only difference being:

[0066] To further enhance the solid-liquid separation processing capability of the slurry, the slurry hydraulic device 56 of the slurry filter press 5 is installed in series with two sets of filter cloth 53.

[0067] Example 6:

[0068] Please see Figure 6 As shown, the pulp mechanical pressurization preparation system of Embodiment Six of this utility model is similar to that of Embodiment One, with the only difference being:

[0069] To further enhance the solid-liquid separation processing capacity of the pulp and avoid loss of pulp fiber length due to bending of the pulp plate during the solid-liquid separation process, the pulp hydraulic device 56 of the pulp filter press 5 is installed in three sets in series through the filter cloth 53, and the pulp filter plates 55 in the three sets of pulp hydraulic devices 56 are installed in two pieces, one on top and one on the bottom. The pulp spreading device 52 and the filter cloth traction device 54 are installed in two sets in parallel, one on top and one on the bottom.

[0070] The preparation method of the pulp mechanical pressurization preparation system of this utility model includes the following steps:

[0071] S1 Preparation: Prepare wood chips that have been cleaned of debris, sand, and other impurities, or that have been stored, fermented, and have had their moisture content balanced.

[0072] S2 System Startup: Start the pulper 1, the cooking device 2, and / or the spray chamber 3, the pulp filter press 5, and / or the refiner 7, the washing device 8, the screening device 9, the bleaching device 10, and the thickening device 11 respectively, so that the system is in startup standby state. S3 Wood Chip Crushing: Put the wood chips prepared in S1 into the pulper 1 and crush them into fine particles of 5-20mm.

[0073] S4 Cooking: The wood chips crushed by the pulper 1 described in S3 are put into the cooking device 2 and mixed with the chemical solution, and reacted under a preset high temperature and high pressure.

[0074] S5 Slurry Filtration and Black Liquor Recovery: The slurry that has completed the cooking reaction in S4 is fed into the slurry distribution device 52 of the slurry filter press 5. The slurry distribution device 52 and the filter cloth traction device 54 are started and operated. The slurry distribution device 52 evenly spreads the slurry, wraps it around the filter cloth 53, and is directly pulled and transported by the filter cloth traction device 54 to the slurry hydraulic device 56 and between the slurry filter plates 55 for ultra-high pressure filtration of 1 to 15 MPa. Under the pressure of the slurry hydraulic device 56, some black liquor is discharged from both sides of the slurry filter plates 55 through the filter cloth 53 and flows into the black liquor recovery device (such as the black liquor return tank) through the pipeline. The slurry is filtered into slurry sheets with a dryness of 30% to 70%.

[0075] S6 Washing and Black Liquor Recovery: The slurry sheet with a dryness of 30% to 70% after filtration by the slurry filter press 5 described in S5 is fed into the washing device 8 for three to five stages of washing to improve the purity of the slurry and further recover the black liquor in the slurry.

[0076] S7 Screening and Purification: The pulp that has been washed in S6 is fed into the screening device 9 to remove undistilled fiber bundles and impurities, thereby improving the cleanliness of the pulp.

[0077] S8 Bleaching: The pulp that has been screened and purified in S7 is fed into the bleaching device 10 and treated with chemicals to improve its whiteness.

[0078] S9 Concentration: The pulp that has been bleached in S8 is fed into the concentration device 11 and concentrated to a dryness of about 3%, forming wet pulp suitable for pipeline transportation.

[0079] In a specific embodiment of the preparation method of the mechanical pressurization pulp preparation system of this utility model, wood chips are used as the pulping raw material, and a chemical pulping process is adopted. The specific steps of the preparation method are as follows:

[0080] S1 Preparation: Prepare wood chips that have been cleaned of debris, sand, and other impurities, or that have been stored, fermented, and have had their moisture content balanced.

[0081] S2 Start-up System: Start the pulper 1, the cooking device 2, the pulp filter press 5, the washing device 8, the screening device 9, the bleaching device 10, and the thickening device 11 respectively to put the system into start-up standby state.

[0082] S3 Wood Chip Crushing: The wood chips prepared in S1 are fed into the pulper 1 and crushed to a particle size of 10mm.

[0083] S4 Cooking: The wood chips crushed by the pulper 1 described in S3 are put into the cooking device 2 and mixed with NaOH and Na2S solutions. The mixture is then cooked at a high temperature of 160-170°C and a high pressure of 8 bar for 2 hours.

[0084] S5 Slurry Filtration and Black Liquor Recovery: The slurry that has completed the cooking reaction in S4 is fed into the slurry distribution device 52 of the slurry filter press 5. The slurry distribution device 52 and the filter cloth traction device 54 are started and operated. The slurry distribution device 52 evenly spreads the slurry to a thickness of 30mm, sandwiched between the upper and lower filter cloths 53, and is directly pulled and transported by the filter cloth traction device 54 to the slurry hydraulic device 56 and between the slurry filter plates 55 for ultra-high pressure filtration, which is gradually increased from 1MPa to 15MPa and lasts for 60 seconds. During this period, some black liquor is discharged from both sides of the slurry filter plate 55 through the filter cloth 53 under the pressure of the slurry hydraulic device 56 and flows into the black liquor recovery device (such as the black liquor return tank) through the pipeline. The slurry is filtered into slurry sheets with a dryness of 70%.

[0085] S6 Washing and Black Liquor Recovery: The 70% dryness slurry sheet after filtration by the slurry filter press 5 described in S5 is fed into the slurry sheet crushing device 6 for crushing and breaking. The loose slurry is then sequentially fed into the first-stage washer 81, the second-stage washer 82, and the third-stage washer 83 of the washing device 8 for three-stage washing to remove residual chemicals and dissolved lignin, improve the purity of the slurry, and further recover the black liquor in the slurry.

[0086] S7 Screening and Purification: The pulp that has undergone three-stage washing in S6 is fed into the screening device 9 to remove undecomposed wood chips, coarse fiber bundles and impurities, so that the uniformity and cleanliness of the pulp meet the requirements.

[0087] S8 Bleaching: The slurry that has been screened and purified in S7 is fed into the bleaching device 10 and bleached with chlorine dioxide to achieve the set whiteness requirement.

[0088] S9 Concentration: The pulp that has been bleached in S8 is fed into the concentration device 11 and concentrated to a dryness of 3% by vacuum dehydration, forming wet pulp suitable for pipeline transportation.

[0089] In the second specific embodiment of the preparation method of the mechanical pressurization pulp preparation system of this utility model, wood chips are used as pulping raw materials, and a chemimechanical pulping process is adopted. The preparation method is similar to that of the previous embodiment, except that:

[0090] The pulper 1 described in S3 breaks down wood chips into particles of 5 mm.

[0091] The wood chips with a particle size of 5mm after being crushed by the pulper 1 in S4 are put into the cooking device 2 and mixed with NaOH and Na2S solutions. The mixture is then soaked for 10 minutes at normal pressure and a temperature range of 90-100℃.

[0092] The slurry that has completed the cooking reaction in S5 is fed into the slurry filter press 5 for filtration at a pressure of 6 MPa and a net time of 10 seconds. The slurry is then filtered into slurry sheets with a dryness of 30%.

[0093] S6 pulp flakes with a dryness of 30% are first fed into the refiner 7 for refining, and then the refined pulp is sequentially fed into the first-stage washer 81, the second-stage washer 82, the third-stage washer 83 and the fourth-stage washer 84 of the washing device 8 for four-stage washing to remove residual black liquor.

[0094] The slurry that has been screened and purified in S8 is fed into the bleaching device 10 for bleaching with hydrogen peroxide.

[0095] In the third specific embodiment of the preparation method of the mechanical pressurization pulp preparation system of this utility model, wood chips are used as pulping raw materials, and a chemical pulping process is adopted. The preparation method is similar to that of the previous embodiment, except that:

[0096] In S5, the slurry is first sprayed into the spray chamber 3 by the cooking device 2, and then conveyed into the slurry filter press 5 for filtration by the spray chamber 3;

[0097] The slurry that has completed the cooking reaction in S5 is fed into the slurry filter press 5 for filtration at a pressure of 5 MPa for a net time of 300 seconds. The slurry is then filtered into slurry sheets with a dryness of 60%.

[0098] S6 feeds slurry with a dryness of 60% into the blade / hammer crusher 64, and washing water is added simultaneously during crushing and dispersing.

[0099] In the fourth specific embodiment of the preparation method of the mechanical pressurization pulp preparation system of this utility model, wood chips are used as the pulping raw material, and a chemical pulping process is adopted. The preparation method is similar to that of the previous embodiment, except that:

[0100] S5 and S6 are performed in reverse order. That is, the slurry after cooking by the cooking device 2 is first washed by the first-stage washing machine 81 of the washing device 8 and then fed into the slurry filter press 5 for filtration at 8MPa pressure and 60 seconds. The slurry is then filtered into slurry flakes with a dryness of 50% and then sequentially fed into the second-stage washing machine 82, the third-stage washing machine 83, the fourth-stage washing machine 84 and the fifth-stage washing machine 85 of the washing device 8 to complete the entire washing process and meet the requirements for pesticide residue indicators.

[0101] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A pulp mechanical pressurization preparation system, comprising a pulper (1), a cooking device (2), a washing device (8), a screening device (9), a bleaching device (10), and a thickening device (11), wherein the pulper, the cooking device, the washing device, the screening device, the bleaching device, and the thickening device are sequentially connected and installed, and the washing device consists of a three-stage to a five-stage washing machine, characterized in that: It also includes a slurry filter press (5); the slurry filter press is connected and installed at the rear end of the cooking device or at the front end of any of the first three stages of the washing device.

2. The pulp mechanical pressurization preparation system according to claim 1, characterized in that: It also includes a spray chamber (3), wherein the slurry filter press is connected and installed at the rear end of the cooking device or the spray chamber, or at the front end of any of the first three stages of the washing device.

3. The pulp mechanical pressurization preparation system according to claim 1, characterized in that: It also includes a pulping mill (7), wherein the pulp filter press is connected and installed at the rear end of the cooking device and at the front end of any of the three stages of the pulping mill or the washing device.

4. The pulp mechanical pressurization preparation system according to claim 1, characterized in that: It also includes a spray chamber (3) and a pulper (7), wherein the pulp filter press is connected and installed at the rear end of the cooking device or the spray chamber, or at the front end of any one of the three stages of the pulper or the washing device.

5. The pulp mechanical pressurization preparation system according to any one of claims 1 to 4, characterized in that: The slurry filter press (5) includes a filter press frame (51), a slurry feeding device (52), a filter cloth (53), a filter cloth traction device (54), a slurry filter plate (55), and a slurry hydraulic device (56). The slurry feeding device, the filter cloth traction device, and the slurry hydraulic device are connected and installed on the filter press frame. The slurry filter plate is installed on the slurry hydraulic device. The filter cloth is wound around and movably connected to the filter cloth traction device and passes through the slurry filter plate.

6. The pulp mechanical pressurization preparation system according to claim 1 or 2, characterized in that: It also includes a slurry flake crushing device (6); the slurry flake crushing device is connected and installed at the rear end of the slurry filter press and the front end of the washing device.

7. The pulp mechanical pressurization preparation system according to claim 3 or 4, characterized in that: It also includes a slurry flake crushing device (6); the slurry flake crushing device is connected and installed at the rear end of the slurry filter press, the washing device or the front end of the grinding mill (7).

8. The pulp mechanical pressurization preparation system according to claim 1 or 3, characterized in that: It also includes a solid-liquid pre-separation device (4); the solid-liquid pre-separation device is connected and installed at the rear end of the cooking device (2) and the front end of the slurry filter press (5).

9. The pulp mechanical pressurization preparation system according to claim 2 or 4, characterized in that: It also includes a solid-liquid pre-separation device (4); the solid-liquid pre-separation device is connected and installed at the rear end of the cooking device (2) or the spray chamber (3) and at the front end of the slurry filter press (5).

10. The pulp mechanical pressurization preparation system according to claim 6 or 7, characterized in that: The slurry shredder (6) includes a double roller shredder (61) and / or a twin screw conveyor (62), a chain crusher (63) or a blade / hammer crusher (64), and a paddle mixer (65).

11. The pulp mechanical pressurization preparation system according to claim 8 or 9, characterized in that: The solid-liquid pre-separation device (4) is a belt separator (41) or a spiral screen separator (42).

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