Cotton stalk papermaking pulping system and method

Abstract

The invention discloses a cotton stalk papermaking and pulping system and method, relates to the technical field of pulping and papermaking, and mainly aims to degrade pectin in cotton stalks on the basis of reducing dependence on high-concentration alkali. According to the main technical scheme, the cotton stalk papermaking pulping system comprises a material preparation part, an enzymolysis part and a cooking part; the material preparation part comprises a wet material preparation unit, a screw extruder and a double-screw thread rolling machine which are connected in sequence; the enzymolysis part comprises a hot spiral conveying mechanism, a mixed material lifting spiral conveying mechanism and an enzymolysis reaction bin which are connected in sequence, and the mixed material lifting spiral conveying mechanism is connected to an enzyme preparation blending tank; the cooking part comprises an aggregate spiral conveying mechanism, a bucket elevator, a feeding spiral conveying mechanism, a cooking pipe mechanism, a discharger and a spraying bin which are connected in sequence.

Description

Technical Field

[0001] The present invention relates to the technical field of pulp and paper making, and particularly to a cotton stalk pulp making system and method for papermaking. Background Art

[0002] For a long time, the raw material problem has severely restricted the development of the pulp and paper industry. The raw materials are seriously insufficient, with more grass raw materials and less wood raw materials. As high-quality papermaking raw materials, cotton stalk resources have attracted the attention of major papermaking enterprises.

[0003] However, the high content of pectin in cotton stalks resulting in high consumption of chemicals and steam per ton of pulp, as well as problems in the sizing and paper quality of cotton stalk pulp, have become important factors restricting its use as a papermaking raw material. Traditional cotton stalk pulping technology relies on high-concentration alkali cooking to remove pectin and lignin, resulting in problems such as high energy consumption and excessive wastewater COD.

[0004] Cracking the "sandwich structure" (pectin - hemicellulose - lignin complex) formed by pectin, hemicellulose, and lignin in cotton stalks, reducing cellulose loss while removing pectin, increasing lignin removal, solving the problems of difficult impregnation and softening and poor uniformity caused by the natural resistance of the cell walls of cotton stalk phloem fibers to biological enzymes, and solving the problems of excessive wastewater COD, high treatment costs, and serious environmental pollution caused by high-concentration NaOH in traditional high-concentration alkali pulping are extremely urgent. Summary of the Invention

[0005] In view of this, the present invention provides a cotton stalk pulp making system and method for papermaking, and the main purpose is to degrade the pectin in cotton stalks on the basis of reducing the dependence on high-concentration alkali.

[0006] To achieve the above object, the present invention mainly provides the following technical solutions:

[0007] On the one hand, the present invention provides a cotton stalk pulp making system for papermaking, and the system includes: a stock preparation section, an enzymatic hydrolysis section, and a cooking section;

[0008] The stock preparation section includes a wet stock preparation unit, a screw extruder, and a twin-screw wire rubbing machine connected in sequence;

[0009] The enzymatic hydrolysis section includes a hot screw conveyor, a mixing and lifting screw conveyor, and an enzymatic hydrolysis reaction tank connected in sequence, and the mixing and lifting screw conveyor is connected to an enzyme preparation dispensing tank;

[0010] The cooking section includes an aggregate screw conveyor, a bucket elevator, a feeding screw conveyor, a cooking tube mechanism, a discharger, and a blow tank connected in sequence.

[0011] The object of the present invention and the technical problems to be solved can also be further realized by the following technical measures.

[0012] Optionally, the wet stock preparation unit includes a multi-roll grass washer and an inclined screw dehydrator connected in sequence.

[0013] Optionally, the screw extruder includes a first housing and two screw rods located inside the first housing. The direction from the material inlet of the first housing to the material outlet of the first housing is the first direction. Along the first direction, the diameter of the screw rod gradually increases, the pitch of the spiral blade of the screw rod gradually decreases, and a first filter screen is provided below the screw rod.

[0014] Optionally, the double-screw wire rubbing machine includes a second housing and two wire rubbing screw rods located inside the second housing. A transverse screw rod and a vertical screw rod are sequentially provided in the feeding channel at the upper end of the second housing. A second filter screen is provided below the wire rubbing screw rod, and a drain port is provided below the second filter screen.

[0015] Optionally, it further includes a steam pipeline. One end of the steam pipeline is connected to the upper exhaust port of the blow tank, and the other end is connected to the hot screw conveyor mechanism.

[0016] Optionally, the feeding screw conveyor mechanism includes a third housing and a feeding screw located inside the third housing. A third filter screen is provided below the feeding screw. The drain port of the third housing below the third filter screen is connected to the enzyme preparation mixing tank, the discharge port of the third housing is connected to the inlet of the cooking tube mechanism, and the inlet of the cooking tube mechanism is connected to the alkali liquor spraying pipe.

[0017] Optionally, the cooking section further includes a return screw mechanism, a pin drum meter, and a pre-steaming screw mechanism. The outlet of the bucket elevator is connected to the inlet of the return screw mechanism. The middle outlet of the return screw mechanism is connected to the inlet of the pin drum meter. The end outlet of the return screw mechanism is connected to the enzymatic hydrolysis reaction tank. The outlet of the pin drum meter is connected to the inlet of the pre-steaming screw mechanism. The outlet of the pre-steaming screw mechanism is connected to the inlet of the feeding screw conveyor mechanism.

[0018] Optionally, the enzymatic hydrolysis section further includes an enzyme preparation pump. The inlet of the enzyme preparation pump is connected to the enzyme preparation mixing tank, and the outlet of the enzyme preparation pump is connected to the mixing and lifting screw conveyor mechanism.

[0019] On the other hand, the present invention provides a method for making pulp from cotton stalks for papermaking, and the method includes the following steps:

[0020] Step 1: Use a multi-roll grass washer to dilute and wash the cotton stalk slices, and then dehydrate the cotton stalk slices with an inclined screw dehydrator.

[0021] Step 2: The dehydrated cotton stalk slices sequentially enter a screw extruder and a double-screw wire rubbing machine to tear and grind the cotton stalk slices into loose cotton stalk filaments.

[0022] Step 3: The cotton stalks first enter the hot spiral conveying mechanism to increase the temperature of the cotton stalks to the enzymatic hydrolysis temperature, and then enter the mixing and lifting spiral conveying mechanism. During the conveying and lifting process, the cotton stalks and the enzyme preparation are evenly mixed;

[0023] Step 4: After being mixed with the enzyme preparation, the cotton stalk silk strips enter the enzymatic hydrolysis reaction chamber for enzymatic hydrolysis reaction;

[0024] Step 5: The enzymatically hydrolyzed cotton stalks are measured by a drum meter, then enter a cooking tube mechanism for cooking, and finally enter a spray bin for standby use.

[0025] By means of the above technical solution, the present invention has at least the following advantages:

[0026] The screw extruder further dehydrates the cotton stalk pieces to a dryness of 30-35%, meeting the feeding requirements of the twin-screw thread rolling machine. The twin-screw thread rolling machine is for rough thread rolling, tearing and grinding the cotton stalk pieces into loose cotton stalk strips with a length of 10-15mm and a thickness of 2-3mm, which greatly reduces the difficulty of soaking and softening and poor uniformity caused by the natural resistance of the cotton stalk bast fiber cell wall to biological enzymes, making the cotton stalk pieces conducive to the penetration of enzyme preparations to achieve the ideal effect of enzymatic hydrolysis of pectin, and not too small to make the cotton stalk pieces suitable for feeding the subsequent cooking system.

[0027] The cotton stalk pieces treated by the twin-screw thread rolling machine will have a certain temperature under the action of the mechanical energy of the equipment, basically reaching 35-40°C. The temperature required for enzymatic hydrolysis is 40-45°C, so a hot screw conveying mechanism is set to adjust the temperature of the cotton stalk pieces to the appropriate temperature for enzymatic hydrolysis in advance to avoid direct contact between steam and enzyme preparations causing inactivation of the enzyme preparations. Among them, the amount of enzyme preparation added is 0.4-0.6% of the absolute dry cotton stalk amount.

[0028] The enzyme preparation is pectinase, which is a mixed preparation of pectin-decomposing enzymes, including endo-polygalacturonase, endo-polygalacturonate methylesterase, exo-polygalacturonase, exo-polygalacturonate methylesterase, etc.

[0029] In order to improve the contact rate between enzyme and grass slices and increase the efficiency of enzymatic hydrolysis, the dryness of grass slices during enzymatic hydrolysis is set at 23-26%, that is, the enzyme preparation needs to be diluted to a specific ratio and then added to the mixing and lifting screw.

[0030] In the enzymatic reaction chamber, the tissue structure of the cotton stalk sheet is further loosened under the action of the enzyme preparation; the degradation of most of the pectin and the loosening of the sheet tissue structure greatly reduce the drug and steam losses of the cooking delignification unit; the cooking process of the traditional cotton stalk pulping process uses 16-18% alkali (relative to the absolute dry weight of the cotton stalk) and 2-2.2 tons of steam per ton of pulp, while the cooking process of the pulping process using the patented pulping process of the present invention uses 10-12% alkali (relative to the absolute dry weight of the cotton stalk) and 1.3-1.5 tons of steam per ton of pulp.

[0031] This system can achieve a pectin removal rate of ≥95% for cotton stalk raw materials while reducing cellulose loss and increasing lignin removal. It can solve the problem of difficulty in impregnation and softening and poor uniformity caused by the natural resistance of cotton stalk bast fiber cell walls to biological enzymes. It can solve the problem of high COD and high treatment cost caused by high concentration of NaOH in traditional high-concentration alkaline pulping, reduce pulping costs, and solve the problem of high pectin content in cotton stalk pulping, which affects papermaking and paper quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic structural diagram of a cotton stalk papermaking and pulping system provided in an embodiment of the present invention;

[0033] Figure 2 It is a structural schematic diagram of the enzymatic hydrolysis reaction chamber;

[0034] Figure 3 for Figure 2 The view from the middle BB;

[0035] Figure 4 This is an axial view of a twin-screw thread rolling machine;

[0036] Figure 5 It is a structural schematic diagram of a multi-roller grass washer;

[0037] Figure 6 This is a schematic diagram of the disassembly of the structure of the cooking tube;

[0038] Figure 7 is a side view of a screw extruder;

[0039] Figure 8 It is a top view of the screw extruder;

[0040] Figure 9 It is a top view of the feeding screw conveying mechanism;

[0041] Figure 10 for Figure 1 Enlarged view of part A.

[0042] The reference numerals in the accompanying drawings of the specification include: screw extruder 1, double-screw thread rolling machine 2, hot screw conveyor 3, mixing and lifting screw conveyor 4, enzymatic hydrolysis reaction tank 5, enzyme preparation dispensing tank 6, aggregate screw conveyor 7, bucket elevator 8, feeding screw conveyor 9, cooking pipe 10, discharger 11, blow tank 12, high-pressure water pipe 1101, cylinder body 1102, stirring motor 1103, pipe body 1001, screw rod 1002, bin body 501, chain plate 502, material leveling roller 503, multi-roller grass washer 13, inclined screw dehydrator 14, box body 1301, grass washing roller 1302, conical hopper 1303, first switching valve 1304, slag collecting cylinder 1305, second switching valve 1306, water injection pipe 1307, first housing 101, screw rod 102, second housing 201, horizontal screw rod 202, vertical screw rod 203, thread rolling screw rod 204, steam pipeline 15, third housing 901, feeding screw 902, lye spray pipe 16, return screw mechanism 17, pin drum meter 18, pre-steaming screw mechanism 19, enzyme preparation pump 20. Detailed Description of the Invention

[0043] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features, and effects of the application according to the present invention. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0045] As Figure 1 shown, on the one hand, a cotton stalk pulp-making system provided by an embodiment of the present invention includes: a stock preparation section, an enzymatic hydrolysis section, and a cooking section;

[0046] The stock preparation section includes a wet stock preparation unit, a screw extruder 1, and a double-screw thread rolling machine 2 connected in sequence;

[0047] The enzymatic hydrolysis section includes a hot screw conveyor 3, a mixing and lifting screw conveyor 4, and an enzymatic hydrolysis reaction tank 5 connected in sequence, and the mixing and lifting screw conveyor 4 is connected to an enzyme preparation dispensing tank 6;

[0048] The cooking section includes an aggregate screw conveyor 7, a bucket elevator 8, a feeding screw conveyor 9, a cooking pipe 10 mechanism, a discharger 11, and a blow tank 12 connected in sequence.

[0049] As Figure 10As shown, specifically, the upper end of the barrel 1102 of the discharger 11 is connected to the outlet of the cooking tube 10 mechanism, the side wall of the barrel 1102 of the discharger 11 is connected to the high-pressure water pipe 1101, and the lower end side of the barrel 1102 of the discharger 11 is connected to the spraying bin 12. A stirring motor 1103 is installed at the lower end of the barrel 1102 of the discharger 11 to drive the stirring blades in the barrel 1102 to rotate, so that the cooked material in the discharger 11 is evenly diluted and transported to the spraying bin 12 under the impact of high-pressure water. The high-pressure water uses subsequent slurry washing liquid to reduce the system wastewater treatment volume.

[0050] like Figure 6 As shown, specifically, the cooking tube 10 includes a tube body 1001 and a spiral rod 1002 in the tube body 1001 . The spiral rod 1002 uses spiral blades with variable pitch and diameter, thereby increasing the volume ratio of the material in the tube body 1001 to 75%, thereby improving the processing efficiency of the cooking tube 10 .

[0051] like Figure 2 and Figure 3 As shown, specifically, the enzymatic reaction bin 5 includes a bin body 501, and a transmission structure of an adjustable-speed movable bottom chain plate 502 is adopted at the bottom of the bin body 501, and a material-distributing roller 503 is provided on the working surface of the discharge end of the chain plate 502 transmission structure (the material-distributing roller 503 includes a rotating shaft and a plurality of toggle rods fixedly connected to the shaft side of the rotating shaft, and the rotating shaft is rotatably connected to the opposite side wall of the bin body 501, and the rotating shaft drives the toggle rod to rotate, so as to break up the enzymatic material on the working surface and avoid agglomeration of the material discharged from the bin body 501);

[0052] The structure of the enzymatic hydrolysis reaction chamber 5 can meet the time requirement of 4-4.5 hours of enzymatic hydrolysis. The surface of the chamber body 501 is attached with an insulation layer to ensure that the temperature of the cotton stalk sheet drops by 2-4°C within 4.5 hours under a certain filling coefficient, thereby ensuring the smooth progress of the enzymatic hydrolysis reaction; the material distribution roller 503 can make the enzymatic hydrolysis reaction chamber 5 discharge the material evenly, thereby ensuring the normal operation of the cooking delignification unit.

[0053] like Figure 1 As shown, in a specific embodiment, the wet material preparation unit includes a multi-roller grass washer 13 and an inclined screw dehydrator 14 which are connected in sequence.

[0054] like Figure 5 As shown, in this embodiment, specifically, the multi-roller grass washing machine 13 includes a box body 1301 and a plurality of grass washing rollers 1302, the plurality of grass washing rollers 1302 are horizontally arranged in sequence in the box body 1301, the inlet side wall of the upper end face of the box body 1301 is connected to the water injection pipe 1307, and a plurality of cone buckets 1303 are arranged in sequence on the lower end face of the box body 1301, and the lower ends of the cone buckets 1303 are connected in sequence to the first switch valve 1304, the slag collecting barrel 1305 and the second switch valve 1306.

[0055] Specifically, the water injection pipe 1307 injects water into the box body 1301, and at the same time, the multiple grass washing rollers 1302 rotate in the same direction. The shaft side of the grass washing roller 1302 is evenly distributed with multiple toggle plates, which drive the cotton stalk pieces to immerse in the washing water. In the water, the cotton stalk pieces become loose and absorb water. The heavy impurities are separated and fall into the cone bucket 1303 and the slag collecting cylinder 1305;

[0056] When the multi-roller grass washer 13 is working, the first switch valve 1304 is opened, the second switch valve 1306 is closed, and the heavy impurities are concentrated into the slag collecting barrel 1305; when discharging slag, the first switch valve 1304 is closed, the second switch valve 1306 is opened, and the slag collecting barrel 1305 is discharged. The slag discharge sequence and cycle are set manually and automatically according to the actual situation.

[0057] Specifically, a filter screen is provided under the spiral shaft of the inclined spiral dehydrator 14. When the spiral shaft drives the forage to move upward, the cotton stalk pieces are continuously squeezed by the spiral blades. The water overflowing from the cotton stalk pieces flows downward along the filter screen and passes through the filter screen, thereby dehydrating the cotton stalk pieces and dehydrating the cotton stalk pieces with a concentration of 3-3.5% to a dryness of 20-22%.

[0058] like Figure 7 and Figure 8 As shown, in a specific embodiment, the screw extruder 1 includes a first shell 101 and two screw rods 102 located in the first shell 101. The direction from the material inlet of the first shell 101 to the material outlet of the first shell 101 is a first direction. Along the first direction, the diameter of the screw rod 102 gradually increases, and the pitch of the spiral blades of the screw rod 102 gradually decreases. A first filter is provided under the screw rod 102.

[0059] In this embodiment, specifically, the diameter of the spiral rod 102 gradually increases, and the pitch of the spiral blade gradually decreases. With the rotation of the spiral rod 102, the cotton stalk piece moves toward the material outlet of the first shell 101. At the same time, the volume of the space where the cotton stalk piece is located becomes smaller, and the extrusion pressure on the cotton stalk piece gradually increases. The squeezed water passes through the first filter screen and is discharged from the drain outlet of the first shell 101, thereby further dehydrating the cotton stalk piece to a dryness of 30-35%.

[0060] Specifically, the first filter is fixedly disposed in the inner space of the first shell 101 below the spiral rod 102 .

[0061] like Figure 4 As shown, in a specific embodiment, the twin-screw thread rolling machine 2 includes a second shell 201 and two thread rolling screws 204 located in the second shell 201, the feed channel of the second shell 201 is sequentially provided with a transverse screw 202 and a vertical screw 203, a second filter screen is provided below the thread rolling screw 204, and a drainage outlet is provided below the second filter screen.

[0062] In this embodiment, specifically, the twin-screw wire rolling machine 2 performs rough wire rolling, tearing and grinding the cotton stalk slices into loose cotton stalk filaments with a length of 10-15 mm and a thickness of 2-3 mm, greatly reducing the problems of difficult impregnation softening and poor uniformity caused by the natural resistance of the cotton stalk phloem fiber cell wall to biological enzymes, making the cotton stalk slices not only conducive to the penetration of the enzyme preparation to achieve the ideal effect of enzymatic hydrolysis of pectin but also not too fine, so that the cotton stalk material slices are suitable for feeding into the subsequent continuous steaming system.

[0063] The cotton stalk slices processed by the twin-screw wire rolling machine 2 will have a certain temperature under the action of the mechanical energy of the equipment, basically reaching 35-40 °C.

[0064] Specifically, the second filter screen is fixedly arranged in the internal space of the second housing 201 below the wire rolling screw 204.

[0065] As Figure 1 shown, in a specific embodiment, it further includes a steam pipeline 15. One end of the steam pipeline 15 is connected to the upper exhaust port of the blow-off bin 12, and the other end is connected to the hot screw conveyor 3.

[0066] In this embodiment, specifically, the cooked cotton stalk material slices enter the blow-off bin 12, and the waste heat steam in the blow-off bin reaches the hot screw conveyor 3 along the steam pipeline 15, so as to achieve the purpose of heating the cotton stalk material slices by using the cooking preheating, meeting the temperature requirement of 40-45 °C for the enzymatic hydrolysis of the cotton stalk slices.

[0067] As Figure 1 and Figure 9 shown, in a specific embodiment, the feeding screw conveyor 9 includes a third housing 901 and a feeding screw 902 located in the third housing 901. A third filter screen is arranged below the feeding screw 902. The drain port of the third housing 901 below the third filter screen is connected to the enzyme preparation dispensing tank 6, and the discharge port of the third housing 901 is connected to the inlet of the cooking tube 10 mechanism. The inlet of the cooking tube 10 mechanism is connected to the alkali liquor spraying pipe 16.

[0068] In this embodiment, specifically, the enzymatically hydrolyzed cotton stalk material slices enter the third housing 901 of the feeding screw conveyor 9. After extrusion, the residual moisture therein flows into the enzyme preparation dispensing tank 6 through the third filter screen. After increasing the dryness of the enzymatically hydrolyzed cotton stalk material slices, the cotton stalk material slices are mixed with alkali liquor and then enter the cooking tube 10 mechanism. Because the cotton stalk slices have been wire rolled and enzymatically hydrolyzed sufficiently before, the amount of alkali used in the cooking process is reduced, the dependence on high-concentration alkali is reduced, and the excessive COD of the wastewater is avoided.

[0069] Specifically, the solution in the enzyme preparation dispensing tank 6 uses the moisture discharged by the feeding screw conveyor 9. This moisture contains residual enzyme components that have not reacted sufficiently with pectin.

[0070] Specifically, the third filter screen is fixedly arranged in the inner space of the third housing 901 below the feeding screw 902.

[0071] As Figure 1 shown, in the specific embodiment, the cooking section further includes a return screw mechanism 17, a pin drum meter 18, and a pre-steaming screw mechanism 19. The outlet of the bucket elevator 8 is connected to the inlet of the return screw mechanism 17. The middle outlet of the return screw mechanism 17 is connected to the inlet of the pin drum meter 18. The end outlet of the return screw mechanism 17 is connected to the enzymatic hydrolysis reaction tank 5. The outlet of the pin drum meter 18 is connected to the inlet of the pre-steaming screw mechanism 19. The outlet of the pre-steaming screw mechanism 19 is connected to the inlet of the feeding screw conveyor mechanism 9.

[0072] In this embodiment, specifically, because the material quantity conveyed by the bucket elevator 8 is different at different times, through the quantitative measurement of the pin drum meter 18, the subsequent cooking treatment quantity tends to be stable;

[0073] The cotton stalk flakes output by the bucket elevator 8 enter the return screw mechanism 17, first flow out through the middle outlet to the pin drum meter 18, and the excess cotton stalk flakes return to the enzymatic hydrolysis reaction tank 5 through the end outlet via the inclined chute. The preheating screw mechanism receives the material discharged from the pin drum meter 18, which can make the cotton stalk flakes uniform and dense again, and the flow rate of the cotton stalk flakes is stable again, so that the extrusion degree of the feeding screw conveyor mechanism 9 on the cotton stalk flakes tends to be stable, so that the dryness of the cotton stalk flakes before mixing with the lye is kept stable and controllable, thus facilitating the control of the cooking process indexes.

[0074] As Figure 1 shown, in the specific embodiment, the enzymatic hydrolysis section further includes an enzyme preparation pump 20. The inlet of the enzyme preparation pump 20 is connected to the enzyme preparation dispensing tank 6. The outlet of the enzyme preparation pump 20 is connected to the mixing and lifting screw conveyor mechanism 4.

[0075] In this embodiment, specifically, the enzyme preparation pump 20 adopts a positive displacement pump, so as to avoid the damage of the mechanical force to the components of the enzyme preparation.

[0076] On the other hand, another embodiment of the present invention provides a method for making pulp from cotton stalks for papermaking, and the method includes the following steps:

[0077] Step 1: Use the multi-roll grass washer 13 to dilute and wash the cotton stalk flakes, and then dehydrate the cotton stalk flakes through the inclined screw dehydrator 14;

[0078] Step 2: The dehydrated cotton stalk flakes sequentially enter the screw extruder 1 and the twin-screw wire rubbing machine 2 to tear and grind the cotton stalk flakes into loose cotton stalk filaments;

[0079] Step 3: The cotton stalk filaments first enter the hot spiral conveyor mechanism 3 to raise the temperature of the cotton stalk filaments to the enzymatic hydrolysis temperature, and then enter the mixing and lifting spiral conveyor mechanism 4. During the conveying and lifting processes, the cotton stalk filaments and the enzyme preparation are evenly mixed;

[0080] Step 4: After being mixed with the enzyme preparation, the cotton stalk filaments enter the enzymatic hydrolysis reaction tank 5 for enzymatic hydrolysis reaction;

[0081] Step 5: After being metered by the distributor drum meter 18, the enzymatically hydrolyzed cotton stalk filaments enter the cooking tube 10 mechanism for cooking and finally enter the blow tank 12 for standby.

[0082] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claimed rights.

Claims

1. A cotton stalk papermaking and pulping system, characterized in that: include: A material preparation section, the material preparation section comprises a wet material preparation unit, a screw extruder and a twin-screw thread rolling machine connected in sequence; An enzymolysis section, the enzymolysis section comprising a heat screw conveying mechanism, a mixing and lifting screw conveying mechanism and an enzymolysis reaction chamber connected in sequence, the mixing and lifting screw conveying mechanism being connected to an enzyme preparation mixing tank; The cooking part comprises a material collecting screw conveying mechanism, a bucket elevator, a feeding screw conveying mechanism, a cooking pipe mechanism, a discharger and a spraying bin which are connected in sequence.

2. The cotton stalk papermaking and pulping system according to claim 1, characterized in that: The wet material preparation unit comprises a multi-roller grass washer and an inclined spiral dehydrator which are connected in sequence.

3. The cotton stalk papermaking and pulping system according to claim 1, characterized in that: The screw extruder includes a first shell and two screw rods located in the first shell. The direction from the material inlet of the first shell to the material outlet of the first shell is a first direction. Along the first direction, the diameter of the screw rod gradually increases, and the pitch of the spiral blades of the screw rod gradually decreases. A first filter is provided under the screw rod.

4. The cotton stalk papermaking and pulping system according to claim 1, characterized in that: The twin-screw thread rolling machine includes a second shell and two thread rolling screws located in the second shell, the feed channel at the upper end of the second shell is provided with a transverse screw and a vertical screw in sequence, a second filter is provided below the thread rolling screw, and a drainage port is provided below the second filter.

5. The cotton stalk papermaking and pulping system according to claim 1, characterized in that: It also includes a steam pipeline, one end of which is connected to the upper exhaust port of the spray bin, and the other end is connected to the hot spiral conveying mechanism.

6. The cotton stalk papermaking and pulping system according to claim 1, characterized in that: The feeding screw conveying mechanism includes a third shell and a feeding screw located in the third shell, a third filter is provided below the feeding screw, a drain port of the third shell below the third filter is connected to the enzyme preparation mixing tank, a discharge port of the third shell is connected to the inlet of the cooking tube mechanism, and the inlet of the cooking tube mechanism is connected to the alkali solution spray pipe.

7. The cotton stalk papermaking and pulping system according to claim 1, characterized in that: The cooking section also includes a return material spiral mechanism, a pin drum meter and a pre-steaming spiral mechanism, the outlet of the bucket elevator is connected to the inlet of the return material spiral mechanism, the middle outlet of the return material spiral mechanism is connected to the inlet of the pin drum meter, the terminal outlet of the return material spiral mechanism is connected to the enzymatic hydrolysis reaction chamber, the outlet of the pin drum meter is connected to the inlet of the pre-steaming spiral mechanism, and the outlet of the pre-steaming spiral mechanism is connected to the inlet of the feeding spiral conveying mechanism.

8. The cotton stalk papermaking and pulping system according to any one of claims 1 to 7, characterized in that: The enzymatic hydrolysis section further comprises an enzyme preparation pump, the inlet of the enzyme preparation pump is connected to the enzyme preparation mixing tank, and the outlet of the enzyme preparation pump is connected to the mixed material lifting and conveying structure.

9. A cotton stalk papermaking and pulping method, characterized in that: The steps include: Step 1: Use a multi-roller grass washer to dilute and clean the cotton stalks, and then use an inclined spiral dehydrator to dehydrate the cotton stalks; Step 2: The dehydrated cotton stalk pieces enter the screw extruder and the twin-screw thread rolling machine in turn to tear and grind the cotton stalk pieces into loose cotton stalk silk strips; Step 3: The cotton stalks first enter the hot spiral conveying mechanism to increase the temperature of the cotton stalks to the enzymatic hydrolysis temperature, and then enter the mixing and lifting spiral conveying mechanism. During the conveying and lifting process, the cotton stalks and the enzyme preparation are evenly mixed; Step 4: After being mixed with the enzyme preparation, the cotton stalk silk strips enter the enzymatic hydrolysis reaction chamber for enzymatic hydrolysis reaction; Step 5: The enzymatically hydrolyzed cotton stalks are measured by a drum meter, then enter a cooking tube mechanism for cooking, and finally enter a spray bin for standby use.

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