Production process of premix in lyocell fiber production

Abstract

The invention relates to a manufacturing process of a premix in lyocell fiber production, which is used for manufacturing a lyocell fiber premix. The method comprises the following steps: adding a first additive into a first pulper to pre-treat cheap pulp so as to destroy the molecular structure of cellulose, so that the polymerization degree of the cheap pulp is reduced to 580-630 from more than 700 and is close to the index of dissolving pulp, then pressing water in pulp porridge to 48%-50% through a presser, crushing the pressed material through a crusher, feeding the crushed material into a pulp porridge storage tank, and storing the crushed material into a second pulper; then putting into a second pulper through a screw conveyor, uniformly mixing the treated cheap pulp and dissolving pulp in the second pulper, and adding an NMMO solvent, a second additive and a third additive to prepare a premix; according to the invention, a part of cheap slurry can be used to reduce the raw material cost, and the investment cost and the energy consumption can also be reduced.

Description

Technical Field

[0001] This invention relates to the field of lyocell fiber production technology, specifically a process for producing premixed materials in lyocell fiber production. Background Technology

[0002] Currently, there are three main processes for producing premixes in lyocell fiber production: 1. Pulp is swollen in a pulper, then the water is pressed out by a press, and then mixed with NMMO solvent, hydroxylamine, and propyl gallate in a premixer to produce a premix; 2. Pulp is pulverized and then mixed with NMMO solvent, hydroxylamine, and propyl gallate in a premixer to produce a premix; 3. Pulp is directly mixed with NMMO solvent, hydroxylamine, and propyl gallate in a pulper to produce a premix. The first process has high investment costs and high energy consumption; the second and third processes have low investment costs and low energy consumption, but can only use dissolving pulp, resulting in high raw material costs. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the purpose of this invention is to provide a process for producing premixed materials in the production of lyocell fibers, which can reduce investment costs and energy consumption, and also use some inexpensive pulp to reduce raw material costs.

[0004] To achieve the above-mentioned objectives, this invention provides a process for preparing a premix in the production of lyocell fiber: Process water is first added to a first pulper, with the volume of the added process water being 70-80% of the capacity of the first pulper. Then, a first additive with a concentration of 20% is added, with the volume ratio of the first additive being 12-18 / 10,000 of the process water. Next, 1000-2000 kg of inexpensive pulp is added to achieve a pulp concentration of 5%. The mixture is stirred at 45°C to 55°C for 35 minutes to break down the cellulose molecular structure, reducing the degree of polymerization of the inexpensive pulp from over 700 to 580-630. The pulp is then pumped into a press to remove water. The pressed material has a water content of 48%-50%. After being pulverized, it is stirred in a pulp storage tank and then conveyed to a second pulper via a screw conveyor. In the second pulper, a 77%-79% NMMO solvent is added, with the amount added being 6% of the total dry weight of the inexpensive pulp and the dissolved pulp. Add 1 to 6.3 times the weight of the first additive (where the weight of the cheap pulp is 1000 to 2000 kg and the weight of the dissolving pulp is 1000 to 2000 kg), then add a second additive at a concentration of 10%, the amount of which is 0.03% to 0.1% of the total dry weight of the cheap pulp and dissolving pulp (where the weight of the cheap pulp is 1000 to 2000 kg and the weight of the dissolving pulp is 1000 to 2000 kg), and then add a third additive at a concentration of 1.25%, the amount of which is 10% to 6.3 times the weight of the second additive (where the weight of the cheap pulp is 1000 to 2000 kg and the weight of the dissolving pulp is 1000 to 2000 kg). Add 0.15%~0.3% of the total dry weight of the cheap pulp and dissolving pulp (of which the weight of cheap pulp is 1000~2000Kg and the weight of dissolving pulp is 1000~2000Kg), then add 1000~2000Kg of dissolving pulp, and then transfer the pulp from the pulp storage tank to the second pulper via a screw conveyor, with the amount added being 50%~100% of the weight of dissolving pulp. Stir at 80℃ to 90℃ for 40~50 minutes to make a premix.

[0005] Furthermore, the low-cost pulp is a non-dissolving pulp, such as paper-to-pulp. The low-cost pulp conveying line is equipped with a weighing device, the model of which is CW-1t, with a capacity of 1000Kg.

[0006] Furthermore, the first additive is cellulase, and a flow monitoring device is installed in the pipeline of the first additive. The model of the flow monitoring device of the first additive is OPTIFLUX405Oc, the flow meter has a measurement range of 0~500L / h, and the pressure is 0.2MPa.

[0007] Furthermore, the process water is either evaporative condensate or demineralized water, and a flow monitoring device is installed in the process water pipeline. The model of the process water flow monitoring device is YYW-Z2-D100DROT, and the flow measurement range is 200m. 3 / h, pressure is 0.4MPa.

[0008] Furthermore, the pipeline for the NMMO solvent is equipped with a flow monitoring device. The model of the flow monitoring device for the NMMO solvent is 8F3B80-AAIBABDFABSAD2SAA1+AKZ1, with a flow measurement range of 20000Kg / h and a pressure of 10Kg.

[0009] Furthermore, the dissolving pulp is a softwood or hardwood pulp suitable for Lyocell production, such as Brazilian pulp, Chilean pulp, IP pulp, SP pulp, and solar pulp. A weighing device is installed on the dissolving pulp conveying line. The model of the dissolving pulp weighing device is CW-1t, and the range is 1000Kg.

[0010] Furthermore, the second additive is hydroxylamine, and a flow monitoring device is installed in the pipeline of the second additive. The model of the flow monitoring device of the second additive is 8A3C02-AAIBABDFAASAD2SAA1+AKZ1, the flow measurement range is 100Kg / h, and the pressure is 16Kg.

[0011] Furthermore, the third additive is propyl gallate, and a flow monitoring device is installed in the pipeline of the third additive. The model of the flow monitoring device of the third additive is 8F3B08-AAIBABDFABSAD2SAA1+AKZ1, the flow measurement range is 500Kg / h, and the pressure is 10Kg.

[0012] Furthermore, the flow monitoring devices for the pipelines containing the first additive, process water, NMMO solvent, second additive, and third additive are interlocked with the weighing devices of the pulp storage tank and the dissolving pulp conveying line. The addition ratios and order of the first additive, process water, NMMO solvent, second additive, and third additive are manually set, and the system automatically adds them according to the pulp weight. The inlet of the discharge pump is connected to the first pulper, the outlet of the discharge pump is connected to the press, the press is connected to the pulverizer, the pulverizer is connected to the pulp storage tank, and the pulp storage tank is connected to the screw conveyor. The feeder is connected to the second pulper; both the first and second pulpers are equipped with a stirring device and a liquid level detection device. The stirring device rotates at 210 rpm, and the liquid level detection device uses a differential pressure level gauge with a range of 100 kPa. The pulp storage tank is equipped with a stirring device and a weighing device. The stirring device rotates at 150 rpm, and the weighing device is a CW-20t model with a range of 20,000 kg, to ensure that all materials are mixed evenly in a predetermined ratio. The first and second pulpers are model ZDS256, with an effective volume of 60 m³. 3 The discharge pump is model SK-150-125-350￠330, and the effective volume of the porridge storage tank is 60m³. 3 The model of the press is TWP0824HX, and the model of the pulverizer is SH08X.

[0013] Compared with existing technologies, this invention pretreats inexpensive pulp by adding a first additive in a first pulper to disrupt the cellulose molecular structure, reducing the degree of polymerization of the inexpensive pulp from over 700 to 580-630, which is close to the index of dissolving pulp. Then, the moisture content of the pulp is reduced to 48%-50% by a press. The pressed material is then crushed by a pulverizer and fed into a pulp storage tank, and then fed into a second pulper by a screw conveyor. In the second pulper, the treated inexpensive pulp and dissolving pulp are mixed evenly, and NMMO solvent, a second additive, and a third additive are added to form a premix. This invention can reduce raw material costs by using a portion of inexpensive pulp, as well as reduce investment costs and energy consumption. Attached Figure Description

[0014] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein: Figure 1 This is a schematic diagram of the process structure of the present invention.

[0015] In the diagram: 1. First pulper; 2. Inexpensive pulp; 3. First additive; 4. Process water; 5. Discharge pump; 6. Second pulper; 7. Dissolving pulp; 8. Press; 9. NMMO solvent; 10. Second additive; 11. Third additive; 12. Flow monitoring device; 13. Stirring device; 14. Liquid level detection device; 15. Weighing device; 16. Crusher; 17. Pulp storage tank; 18. Screw conveyor. Detailed Implementation

[0016] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0018] like Figure 1 As shown, the manufacturing process of a premix in the production of lyocell fiber according to the present invention is as follows: First, process water 4 is added to the first pulper 1, with the volume of process water 4 being 70-80% of the capacity of the first pulper 1. Then, a first additive 3 with a concentration of 20% is added, with the volume ratio of the first additive 3 being 12-18 / 10,000 of the process water 4. Next, 1000-2000 kg of inexpensive pulp 2 is added to bring the pulp concentration to 5%. The mixture is then stirred at a temperature of 45°C to 55°C for 35 minutes to break down the cellulose molecular structure and reduce the inexpensive pulp. After the degree of polymerization of pulp 2 decreases from over 700 to 580-630, it is pumped into press 8 via discharge pump 5 to remove water. The pressed material has a water content of 48%-50%. After passing through crusher 16, it enters pulp storage tank 17, and then enters second pulper 6 via screw conveyor 18. In second pulper 6, NMMO solvent 9 with a concentration of 77%-79% is added, at a rate of 6.1-6.3 times the total dry weight of cheap pulp 2 and dissolved pulp 7 (where the weight of cheap pulp 2 is 1...). 000~2000Kg, dissolving pulp 7 weighs 1000~2000Kg), then add a second additive 10 at a concentration of 10%, the amount added being 0.03%~0.1% of the total dry weight of cheap pulp 2 and dissolving pulp 7 (where cheap pulp 2 weighs 1000~2000Kg and dissolving pulp 7 weighs 1000~2000Kg), then add a third additive 11 at a concentration of 1.25%, the amount added being the total dry weight of cheap pulp 2 and dissolving pulp 7. 0.15%~0.3% of the dry weight (of which the weight of cheap pulp 2 is 1000~2000Kg and the weight of dissolving pulp 7 is 1000~2000Kg), then add 1000~2000Kg of dissolving pulp 7, and then pump the pulp in the pulp storage tank 17 to the second pulper 6 through the screw conveyor 18, with the amount pumped in being 50%~100% of the weight of dissolving pulp 7, and stir at 80℃ to 90℃ for 40~50 minutes to make a premix.

[0019] Preferably, the inexpensive pulp 2 is a non-dissolving pulp, such as paper-to-pulp. The conveyor line of the inexpensive pulp 2 is equipped with a weighing device 15 to facilitate production measurement. The weighing device 15 of the inexpensive pulp 2 is model CW-1t with a range of 1000Kg.

[0020] Preferably, the first additive 3 is cellulase, and a flow monitoring device 12 is provided in the pipeline of the first additive 3. The model of the flow monitoring device 12 of the first additive 3 is OPTIFLUX405Oc, the flow meter measurement range is 0~500L / h, and the pressure is 0.2MPa.

[0021] Preferably, the process water 4 is evaporative condensate or demineralized water, and a flow monitoring device 12 is installed in the pipeline of the process water 4. The flow monitoring device 12 of the process water 4 is model YYW-Z2-D100DROT, and the flow measurement range is 200m. 3 / h, pressure is 0.4MPa.

[0022] Preferably, the pipeline of the NMMO solvent 9 is equipped with a flow monitoring device 12. The model of the flow monitoring device 12 of the NMMO solvent 9 is 8F3B80-AAIBABDFABSAD2SAA1+AKZ1, the flow measurement range is 20000Kg / h, and the pressure is 10Kg.

[0023] Preferably, the dissolving pulp 7 is a softwood or hardwood pulp suitable for Lyocell production, such as Brazilian pulp, Chilean pulp, IP pulp, SP pulp, solar pulp, etc. The dissolving pulp 7 is conveyed on a weighing device 15, which is a CW-1t weighing device with a capacity of 1000 kg.

[0024] Preferably, the second additive 10 is hydroxylamine, and a flow monitoring device 12 is provided in the pipeline of the second additive 10. The model of the flow monitoring device 12 of the second additive 10 is 8A3C02-AAIBABDFAASAD2SAA1+AKZ1, the flow measurement range is 100Kg / h, and the pressure is 16Kg.

[0025] Preferably, the third additive 11 is propyl gallate, and a flow monitoring device 12 is provided in the pipeline of the third additive 11. The model of the flow monitoring device 12 of the third additive 11 is 8F3B08-AAIBABDFABSAD2SAA1+AKZ1, the flow measurement range is 500Kg / h, and the pressure is 10Kg.

[0026] Preferably, the dry weight of the cheap pulp 2 in each batch is calculated by the weighing device 15 of the pulp storage tank 17 (the cheap pulp, the first additive 3, and the process water have their own added proportions, and the weight of the cheap pulp can be calculated according to the proportions). The dry weight of the dissolved pulp 7 in each batch is calculated by the weighing device 15 on the dissolving pulp 7 conveying line. The sum of the two dry weights is multiplied by the addition coefficients of the second additive 10, the third additive 11, and the NMMO solvent 9 to calculate the addition amount of the second additive 10, the third additive 11, and the NMMO solvent 9, and the program is set to add them automatically. The flow monitoring device 12 of the pipelines for the first additive 3, the process water 4, the NMMO solvent 9, the second additive 10, and the third additive 11 is interlocked with the weighing device 15 of the pulp storage tank 17 and the dissolving pulp 7 conveying line. The addition proportions and order of the first additive 3, the process water 4, the NMMO solvent 9, the second additive 10, and the third additive 11 are manually set, and the system is based on the pulp weight. Automatic addition; the inlet of the discharge pump 5 is connected to the first pulper 1, the outlet of the discharge pump 5 is connected to the press 8, the press 8 is connected to the crusher 16, the crusher 16 is connected to the pulp storage tank 17, the pulp storage tank 17 is connected to the screw conveyor 18, and the screw conveyor 18 is connected to the second pulper 6; the first pulper 1 and the second pulper 6 are respectively equipped with a stirring device 13 and a liquid level detection device 14. The stirring device 13 rotates at 210 rpm, and the liquid level detection device 14 is of type... The liquid level detection uses a differential pressure level gauge with a range of 100 kPa, and the liquid storage tank 17 is equipped with a stirring device 13 and a weighing device 15. The stirring device 13 rotates at 150 rpm, and the weighing device 15 is a CW-20t model with a range of 20,000 kg, to ensure that the materials are mixed evenly in a predetermined ratio. The first pulper 1 and the second pulper 6 are both ZDS256 models with an effective volume of 60 m³. 3 The model of discharge pump 5 is SK-150-125-350￠330, and the effective volume of porridge storage tank 17 is 60m³. 3 The model number of the press 8 is TWP0824HX, and the model number of the crusher 16 is SH08X. Example 1

[0027] Process water 4 is first added to the first pulper 1, with the volume of process water 4 being 70% of the capacity of the first pulper 1. Then, a first additive 3 with a concentration of 20% is added, with the volume ratio of the first additive 3 being 18 ten-thousandths of the process water 4. Next, 1000 kg of inexpensive pulp 2 is added to bring the pulp concentration to 5%. The mixture is stirred at a temperature of 45°C to 55°C for 35 minutes to break down the cellulose molecular structure and reduce the degree of polymerization of the inexpensive pulp 2 from over 700 to 580-600. After that, it is pumped into the press 8 by the discharge pump 5 to press out the water. The pressed material has a water content of 48%. After passing through the pulverizer 16, it enters the pulp storage tank 17 and then enters the second pulper 6 through the screw conveyor 18. First, add 77% NMMO solvent 9 to the second pulper 6, the amount of which is 6.3 times the total dry weight of the cheap pulp 2 and the dissolving pulp 7. Then add 10% of the second additive 10, the amount of which is 0.03%~0.1% of the total dry weight of the cheap pulp 2 and the dissolving pulp 7. Then add 1.25% of the third additive 11, the amount of which is 0.15%~0.3% of the total dry weight of the cheap pulp 2 and the dissolving pulp 7. Then add 1000 kg of dissolving pulp 7. Then, the pulp in the pulp storage tank 17 is pumped to the second pulper 6 through the screw conveyor 18, the amount of which is 50% of the weight of the dissolving pulp 7. Stir at 80℃ to 90℃ for 40 to 50 minutes to make a premix. Example 2

[0028] Process water 4 is first added to the first pulper 1, with a volume of 75% of the capacity of the first pulper 1. Then, a first additive 3 with a concentration of 20% is added, with a volume ratio of 1 / 150,000 of the process water 4. Next, 1500 kg of inexpensive pulp 2 is added to achieve a pulp concentration of 5%. The mixture is stirred at 45°C to 55°C for 35 minutes to break down the cellulose molecular structure, reducing the degree of polymerization of the inexpensive pulp 2 from over 700 to 600-610. The pulp is then pumped into the press 8 via the discharge pump 5 to remove water. The pressed material has a water content of 49%. After passing through the pulverizer 16, it enters the pulp storage tank 17, and then is conveyed by the screw conveyor 18 into the second pulper 6. First, add 78% NMMO solvent 9 to the second pulper 6, at a concentration of 6.2 times the total dry weight of the inexpensive pulp 2 and the dissolving pulp 7. Then, add 10% of the second additive 10, at a concentration of 0.03% to 0.1% of the total dry weight of the inexpensive pulp 2 and the dissolving pulp 7. Next, add 1.25% of the third additive 11, at a concentration of 0.15% to 0.3% of the total dry weight of the inexpensive pulp 2 and the dissolving pulp 7. Then, add 1500 kg of dissolving pulp 7. The pulp in the pulp storage tank 17 is then conveyed to the second pulper 6 via a screw conveyor 18, at a concentration of 75% of the weight of the dissolving pulp 7. The mixture is stirred at 80°C to 90°C for 40 to 50 minutes to produce a premix. Example 3

[0029] Process water 4 is first added to the first pulper 1, with the volume of process water 4 being 80% of the capacity of the first pulper 1. Then, a first additive 3 with a concentration of 20% is added, with the volume ratio of the first additive 3 being 12 / 10,000 of the process water 4. Next, 2000 kg of inexpensive pulp 2 is added to bring the pulp concentration to 5%. The mixture is stirred at a temperature of 45°C to 55°C for 35 minutes to break down the cellulose molecular structure and reduce the degree of polymerization of the inexpensive pulp 2 from over 700 to 610-630. After that, it is pumped into the press 8 by the discharge pump 5 to press out the water. The pressed material has a water content of 50%. After passing through the pulverizer 16, it enters the pulp storage tank 17 and then enters the second pulper 6 through the screw conveyor 18. First, add 79% NMMO solvent 9 to pulper 6, the amount of which is 6.1 times the total dry weight of cheap pulp 2 and dissolving pulp 7. Then add 10% of the second additive 10, the amount of which is 0.03%~0.1% of the total dry weight of cheap pulp 2 and dissolving pulp 7. Then add 1.25% of the third additive 11, the amount of which is 0.15%~0.3% of the total dry weight of cheap pulp 2 and dissolving pulp 7. Then add 2000 kg of dissolving pulp 7. Then, the pulp in pulp storage tank 17 is fed to the second pulper 6 through screw conveyor 18, the amount of which is 100% of the weight of dissolving pulp 7. Stir at 80℃ to 90℃ for 40~50 minutes to make a premix.

[0030] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A process for producing premixed materials in the production of lyocell fibers, characterized in that: First, process water (4) is added to the first pulper (1). The volume of process water (4) added is 70-80% of the volume of the first pulper (1). Then, a first additive (3) with a concentration of 20% is added. The volume ratio of the first additive (3) added is 12-18 / 10,000 of the process water (4). Then, 1000-2000 kg of cheap pulp (2) is added to make the pulp concentration reach 5%. Stir at 45°C to 55°C for 35 minutes to destroy the cellulose molecular structure and make the cheap pulp (2) After the degree of polymerization of the material is reduced from over 700 to 580-630, it is pumped into the press (8) by the discharge pump (5) to press out the water. The pressed material has a water content of 48%-50%. After being crushed by the pulverizer (16), it enters the pulp storage tank (17) for stirring, and then enters the second pulper (6) through the screw conveyor (18). In the second pulper (6), NMMO solvent (9) with a concentration of 77%-79% is added first. The amount added is 6.1-6.3 times the total dry weight of the cheap pulp (2) and the dissolving pulp (7). The weight of the inexpensive pulp (2) is 1000~2000Kg, and the weight of the dissolving pulp (7) is 1000~2000Kg. Then, a second additive (10) with a concentration of 10% is added, and the amount added is 0.03%~0.1% of the total dry weight of the inexpensive pulp (2) and the dissolving pulp (7) (where the weight of the inexpensive pulp (2) is 1000~2000Kg and the weight of the dissolving pulp (7) is 1000~2000Kg). Then, a third additive (11) with a concentration of 1.25% is added, and the amount added is the same as that of the inexpensive pulp (2) and the dissolving pulp (7). 0.15%~0.3% of the total dry weight of the pulp (7) (of which the weight of the cheap pulp (2) is 1000~2000Kg and the weight of the dissolving pulp (7) is 1000~2000Kg), and then 1000~2000Kg of dissolving pulp (7) is added. The pulp in the pulp storage tank (17) is then pumped to the second pulper (6) by the screw conveyor (18), and the amount added is 50%~100% of the weight of the dissolving pulp (7). The mixture is stirred at 80℃ to 90℃ for 40~50 minutes to make a premix.

2. The process for producing premixed materials in the production of lyocell fiber according to claim 1, characterized in that: The cheap pulp (2) is a non-dissolving pulp, such as paper-to-pulp. A weighing device (15) is provided on the conveying line of the cheap pulp (2). The weighing device (15) of the cheap pulp (2) is of model CW-1t and has a range of 1000Kg.

3. The process for producing premixed materials in the production of lyocell fiber according to claim 1, characterized in that: The first additive (3) is cellulase. A flow monitoring device (12) is installed in the pipeline of the first additive (3). The model of the flow monitoring device (12) of the first additive (3) is OPTIFLUX405Oc. The flow meter has a measurement range of 0~500L / h and a pressure of 0.2MPa.

4. The process for producing premixed materials in the production of lyocell fiber according to claim 1, characterized in that: The process water (4) is either evaporative condensate or demineralized water. A flow monitoring device (12) is installed in the pipeline of the process water (4). The model of the flow monitoring device (12) of the process water (4) is YYW-Z2-D100DROT, and the flow metering range is 200m. 3 / h, pressure is 0.4MPa.

5. The process for producing premixed materials in the production of lyocell fiber according to claim 1, characterized in that: The pipeline of the NMMO solvent (9) is equipped with a flow monitoring device (12). The model of the flow monitoring device (12) of the NMMO solvent (9) is 8F3B80-AAIBABDFABSAD2SAA1+AKZ1, the flow measurement range is 20000Kg / h, and the pressure is 10Kg.

6. The process for producing premixed materials in the production of lyocell fiber according to claim 1, characterized in that: The dissolving pulp (7) is a softwood or hardwood pulp suitable for Lyocell production, such as Brazilian pulp, Chilean pulp, IP pulp, SP pulp, and solar pulp. A weighing device (15) is provided on the conveying line of the dissolving pulp (7). The model of the weighing device (15) of the dissolving pulp (7) is CW-1t, and the range is 1000Kg.

7. The process for producing premixed materials in the production of lyocell fiber according to claim 1, characterized in that: The second additive (10) is hydroxylamine. A flow monitoring device (12) is installed in the pipeline of the second additive (10). The model of the flow monitoring device (12) of the second additive (10) is 8A3C02-AAIBABDFAASAD2SAA1+AKZ1, the flow measurement range is 100Kg / h, and the pressure is 16Kg.

8. The process for producing premixed materials in the production of lyocell fiber according to claim 1, characterized in that: The third additive (11) is propyl gallate. A flow monitoring device (12) is installed in the pipeline of the third additive (11). The model of the flow monitoring device (12) of the third additive (11) is 8F3B08-AAIBABDFABSAD2SAA1+AKZ1, the flow measurement range is 500Kg / h, and the pressure is 10Kg.

9. The process for producing premixed materials in the production of lyocell fiber according to claim 1, characterized in that: The flow monitoring device of the pipeline for the first additive (3), process water (4), NMMO solvent (9), second additive (10), and third additive (11) is interlocked with the weighing device (15) of the pulp storage tank (17) and the dissolving pulp (7) conveying line. The addition ratio and order of the first additive (3), process water (4), NMMO solvent (9), second additive (10), and third additive (11) are manually set, and the system automatically adds them according to the weight of the pulp. The inlet of the discharge pump (5) is connected to the first pulper (1), and the outlet of the discharge pump (5) is connected to the press (8). The press (8) is connected to the crusher (16), the crusher (16) is connected to the pulp storage tank (17), and the pulp storage tank (17) is connected to the screw conveyor (18). (18) Connected to the second pulper (6); the first pulper (1) and the second pulper (6) are respectively equipped with a stirring device (13) and a liquid level detection device (14). The stirring device (13) has a rotation speed of 210 rpm, and the liquid level detection device (14) is model 3051DP3A22A1BS1M5HR5. The liquid level detection adopts a differential pressure level gauge with a range of 100KPa; the porridge storage tank (17) is equipped with a stirring device (13) and a weighing device (15). The stirring device (13) has a rotation speed of 150 rpm, and the weighing device (15) is model CW-20t with a range of 20000Kg to ensure that each material is mixed evenly according to the determined ratio; the first pulper (1) and the second pulper (6) are model ZDS256 with an effective volume of 60m³. 3 The discharge pump (5) is model SK-150-125-350￠330, and the effective volume of the porridge storage tank (17) is 60m³. 3 The model of the press (8) is TWP0824HX, and the model of the crusher (16) is SH08X.

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