Spray drying device for microcrystalline cellulose production

Abstract

The utility model relates to the technical field of spray drying, in particular to a spray drying device for microcrystalline cellulose production, which sprays microcrystalline cellulose into a drying mechanism to enable the drying mechanism to dry the microcrystalline cellulose, and then the drying mechanism exhausts used hot air. Meanwhile, heat in hot air is recycled through a heat recovery mechanism, microcrystalline cellulose adhering to the inner wall of the drying mechanism is cleaned through an inner wall cleaning mechanism in the drying process, and therefore the practicability of the equipment is improved; comprising a drying mechanism; the drying device further comprises a heat recovery mechanism and an inner wall cleaning mechanism, the heat recovery mechanism is installed on the drying mechanism, and the inner wall cleaning mechanism is installed in the drying mechanism. The drying mechanism is used for drying microcrystalline cellulose, the heat recovery mechanism is used for recovering heat of air exhausted by the drying mechanism, and the inner wall cleaning mechanism is used for cleaning the inner wall of the drying mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of spray drying, in particular to a spray drying device for producing microcrystalline cellulose. Background Art

[0002] Microcrystalline cellulose, whose main component is a linear polysaccharide bonded by β-1,4-glucosidic bonds, is a white, odorless, tasteless crystalline powder composed of extremely fine short rods or powdery porous particles that can flow freely after natural cellulose is hydrolyzed by dilute acid to the limit degree of polymerization.

[0003] Microcrystalline cellulose needs to be dried during the production process. Generally, the microcrystalline cellulose is spray-dried by a spray drying device disclosed in the utility model patent with application number 202220239003.0 and a spray drying system disclosed in the utility model patent with application number 201820721663.6.

[0004] However, it was found during use that the existing spray drying equipment has a relatively simple structure, is not convenient for recovering waste heat, and is not convenient for cleaning the inner wall, resulting in poor practicality. Therefore, there is an urgent need for a spray drying device for microcrystalline cellulose production to improve the above problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a spray drying device for microcrystalline cellulose production, which sprays microcrystalline cellulose into a drying mechanism, so that the drying mechanism dries the microcrystalline cellulose, and then the drying mechanism discharges the hot air after use, and at the same time recovers the heat in the hot air through a heat recovery mechanism, and during the drying process, the microcrystalline cellulose adhered to the inner wall of the drying mechanism is cleaned by an inner wall cleaning mechanism, thereby improving the practicality of the equipment.

[0006] The utility model discloses a spray drying device for producing microcrystalline cellulose, comprising a drying mechanism, a heat recovery mechanism and an inner wall cleaning mechanism, wherein the heat recovery mechanism is installed on the drying mechanism, and the inner wall cleaning mechanism is installed inside the drying mechanism;

[0007] The drying mechanism dries the microcrystalline cellulose, the heat recovery mechanism recovers the heat of the air exhausted by the drying mechanism, and the inner wall cleaning mechanism cleans the inner wall of the drying mechanism;

[0008] The microcrystalline cellulose is sprayed into the drying mechanism, which dries the microcrystalline cellulose. The drying mechanism then discharges the hot air after use, and at the same time recovers the heat in the hot air through the heat recovery mechanism. During the drying process, the microcrystalline cellulose adhering to the inner wall of the drying mechanism is cleaned through the inner wall cleaning mechanism, thereby improving the practicability of the equipment.

[0009] Preferably, the drying mechanism includes a drying bin, a heating box, an exhaust pump, a delivery pipe, a discharge valve and an atomizing nozzle, a chamber is provided inside the drying bin, the heating box is installed at the side end of the drying bin, and a plurality of heating elements are provided inside the heating box, the exhaust pump is installed at the bottom end of the heating box, and the air intake of the exhaust pump is communicated with the interior of the heating box, one end of the delivery pipe is installed on the exhaust port of the exhaust pump, and the other end of the delivery pipe extends to the interior of the drying bin, the top end of the discharge valve is installed at the bottom end of the drying bin, and the atomizing nozzle is installed inside the drying bin; the microcrystalline cellulose is atomized and sprayed into the interior of the drying bin through the atomizing nozzle, and at the same time, air is sucked into the heating box by opening the exhaust pump, so that the plurality of heating elements heat the air, and then the air is sprayed into the interior of the drying bin through the delivery pipe to dry the atomized microcrystalline cellulose, and then the dried microcrystalline cellulose in the drying bin is discharged by opening the discharge valve, thereby improving the practicability of the equipment.

[0010] Preferably, the heat recovery mechanism includes a cleaning mechanism, a heat preservation sleeve, an air jet pipe, a filter, a feed pipe and an air inlet pipe, the bottom ends of the heat preservation sleeve and the air jet pipe are connected to the top of the drying bin, the filter is installed at the top of the drying bin, and the filter is located inside the air jet pipe, a plurality of air jet holes are arranged on the surface of the air jet pipe, the feed pipe and the air inlet pipe are both spirally wound on the air jet pipe, one end of the feed pipe extends to the interior of the drying bin and is connected to the atomizing nozzle, the other end of the air inlet pipe extends to the right side of the heat preservation sleeve and communicates with the interior of the heating box, and the cleaning mechanism is installed on the top of the drying bin; excess hot air in the drying bin passes through 10 and enters the air jet pipe, and the hot air is sprayed onto the surfaces of the feed pipe and the air in the air inlet pipe through the plurality of air jet holes on the air jet pipe, so that the hot air preheats the microcrystalline cellulose in the feed pipe and the air in the air inlet pipe, and the microcrystalline cellulose dried on the filter is cleaned by the cleaning mechanism, thereby improving the practicability of the equipment.

[0011] Preferably, the cleaning mechanism includes a back-spray mechanism, a first motor, a first gear ring, a cleaning brush and a first gear. The first motor is fixedly mounted on a feed pipe in a drying bin, the first gear ring is rotatably mounted on the feed pipe in the drying bin, the top end of the cleaning brush is mounted on the top end of the first gear ring, the bottom end of the first gear is connected to the output shaft of the first motor, and the side end of the first gear is meshingly connected to the side end of the first gear ring, and the back-spray mechanism is mounted on the air intake pipe; the first motor is turned on, and the cleaning brush is rotated through the meshing transmission of the first gear and the first gear ring to clean the dust on the filter screen and reduce the accumulation of microcrystalline cellulose on the filter screen. When the first motor is damaged, air is sprayed out through the back-spray mechanism to recoil the filter screen, so that part of the filter screen remains clean and the equipment remains running, thereby improving the practicability of the equipment.

[0012] Preferably, the back-spray mechanism includes an annular tube and multiple groups of nozzles, the annular tube is installed on the air intake pipe through an electric control valve, and the annular tube is located inside the air injection pipe, and the multiple groups of nozzles are installed at the bottom end of the annular tube; by opening the electric control valve, part of the air in the air intake pipe enters the annular tube, and the air is sprayed toward the filter through the multiple groups of nozzles to clean the microcrystalline cellulose on the filter, thereby improving the practicability of the equipment.

[0013] Preferably, the inner wall cleaning mechanism includes two groups of second gear rings, two groups of second motors, two groups of second gears and multiple groups of scrapers, the two groups of second gear rings are rotatably installed on the inner wall of the drying bin, the two groups of second motors are fixedly installed on the inner wall of the drying bin, the two groups of second gears are respectively installed on the output shafts of the two groups of second motors, and the two groups of second gears are respectively meshed and connected with the two groups of second gear rings, and the top and bottom ends of the multiple groups of scrapers are respectively installed on the two groups of second gear rings; the two groups of second motors are turned on, and the two groups of second gears are respectively meshed and transmitted with the two groups of second gear rings, so that the two groups of second gear rings drive the multiple groups of scrapers to rotate, and the microcrystalline cellulose on the inner wall of the drying bin is scraped off by the multiple groups of scrapers, thereby improving the practicability of the equipment.

[0014] Preferably, a filter box is provided at the top of the air inlet pipe; the air is filtered by the filter box to reduce dust entering the air inlet pipe, thereby improving the practicability of the equipment.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the microcrystalline cellulose is sprayed into the drying mechanism, so that the drying mechanism dries the microcrystalline cellulose, and then the drying mechanism discharges the hot air after use, and at the same time the heat in the hot air is recovered and reused by the heat recovery mechanism, and during the drying process, the microcrystalline cellulose adhering to the inner wall of the drying mechanism is cleaned by the inner wall cleaning mechanism, thereby improving the practicability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the axonometric structure of the utility model;

[0017] Figure 2 It is a front view structural schematic diagram of the utility model;

[0018] Figure 3 It is a front view cross-sectional structural schematic diagram of the utility model;

[0019] Figure 4 This utility model Figure 3 A schematic diagram of the enlarged structure of part A;

[0020] Figure 5 This utility model Figure 3 Schematic diagram of the enlarged structure of part B in FIG.

[0021] Markings in the attached figure: 1. Drying chamber; 2. Heating box; 3. Exhaust pump; 4. Delivery pipe; 5. Discharge valve; 6. Atomizing nozzle; 7. Heating element; 8. Insulation sleeve; 9. Jet pipe; 10. Filter; 11. Feed pipe; 12. Inlet pipe; 13. First motor; 14. First gear ring; 15. Cleaning brush; 16. First gear; 17. Ring pipe; 18. Nozzle; 19. Second gear ring; 20. Second motor; 21. Second gear; 22. Scraper; 23. Filter box. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0023] Example 1

[0024] It includes a drying mechanism; it also includes a heat recovery mechanism and an inner wall cleaning mechanism, the heat recovery mechanism is installed on the drying mechanism, and the inner wall cleaning mechanism is installed in the drying mechanism;

[0025] The drying mechanism dries the microcrystalline cellulose, the heat recovery mechanism recovers the heat of the air exhausted by the drying mechanism, and the inner wall cleaning mechanism cleans the inner wall of the drying mechanism;

[0026] The drying mechanism includes a drying chamber 1, a heating box 2, an exhaust pump 3, a delivery pipe 4, a discharge valve 5 and an atomizing nozzle 6. The drying chamber 1 is provided with a chamber, the heating box 2 is installed at the side end of the drying chamber 1, and a plurality of heating elements 7 are provided inside the heating box 2. The exhaust pump 3 is installed at the bottom end of the heating box 2, and the air intake of the exhaust pump 3 is communicated with the inside of the heating box 2. One end of the delivery pipe 4 is installed on the exhaust port of the exhaust pump 3, and the other end of the delivery pipe 4 extends to the inside of the drying chamber 1. The top end of the discharge valve 5 is installed at the bottom end of the drying chamber 1, and the atomizing nozzle 6 is installed inside the drying chamber 1.

[0027] The heat recovery mechanism includes a cleaning mechanism, a heat preservation sleeve 8, an air jet pipe 9, a filter screen 10, a feed pipe 11 and an air intake pipe 12. The bottom ends of the heat preservation sleeve 8 and the air jet pipe 9 are connected to the top of the drying bin 1. The filter screen 10 is installed at the top of the drying bin 1, and the filter screen 10 is located inside the air jet pipe 9. A plurality of air jet holes are arranged on the surface of the air jet pipe 9. The feed pipe 11 and the air intake pipe 12 are both spirally wound around the air jet pipe 9. One end of the feed pipe 11 extends to the inside of the drying bin 1 and is connected to the atomizing nozzle 6. The other end of the air intake pipe 12 extends to the right side of the heat preservation sleeve 8 and communicates with the inside of the heating box 2. The cleaning mechanism is installed at the top of the drying bin 1.

[0028] The cleaning mechanism includes a back-spray mechanism, a first motor 13, a first gear ring 14, a cleaning brush 15 and a first gear 16. The first motor 13 is fixedly mounted on the feed pipe 11 in the drying bin 1. The first gear ring 14 is rotatably mounted on the feed pipe 11 in the drying bin 1. The top end of the cleaning brush 15 is mounted on the top end of the first gear ring 14. The bottom end of the first gear 16 is connected to the output shaft of the first motor 13. The side end of the first gear 16 is meshedly connected to the side end of the first gear ring 14. The back-spray mechanism is mounted on the intake pipe 12.

[0029] The reverse spray mechanism includes an annular tube 17 and multiple groups of nozzles 18. The annular tube 17 is installed on the air intake pipe 12 through an electric control valve, and the annular tube 17 is located inside the air injection pipe 9. The multiple groups of nozzles 18 are installed at the bottom end of the annular tube 17.

[0030] The microcrystalline cellulose is discharged into the atomizing nozzle 6 through the feeding pipe 11, and the microcrystalline cellulose is atomized and sprayed into the interior of the drying chamber 1 through the atomizing nozzle 6. At the same time, the air is sucked into the heating box 2 by opening the exhaust pump 3, so that the multiple groups of heating elements 7 heat the air, and then the air is sprayed into the interior of the drying chamber 1 through the conveying pipe 4 to dry the atomized microcrystalline cellulose. After that, the dried microcrystalline cellulose in the drying chamber 1 is discharged by opening the discharge valve 5. At the same time, the excess hot air in the drying chamber 1 passes through 10 and enters the injection pipe 9, and the hot air is sprayed onto the surfaces of the feeding pipe 11 and the air inlet pipe 12 through the multiple groups of nozzles on the injection pipe 9, so that the hot air can heat the microcrystalline cellulose in the feeding pipe 11. The element and the air in the intake pipe 12 are preheated, and the dried microcrystalline cellulose on the filter 10 is cleaned by the cleaning mechanism, and the first motor 13 is turned on, and the first gear 16 is meshed with the first gear ring 14 to rotate the cleaning brush 15 to clean the dust on the filter 10 and reduce the accumulation of microcrystalline cellulose on the filter 10. When the first motor 13 is damaged, part of the air in the intake pipe 12 is allowed to enter the annular tube 17 by opening the electric control valve, and the air is sprayed to the filter 10 through multiple groups of nozzles 18 to clean the microcrystalline cellulose on the filter 10, so that part of the position on the filter 10 is kept clean and the equipment is kept running, thereby improving the practicability of the equipment.

[0031] Example 2

[0032] like Figures 1 to 5 As shown, it includes a drying mechanism; it also includes a heat recovery mechanism and an inner wall cleaning mechanism, the heat recovery mechanism is installed on the drying mechanism, and the inner wall cleaning mechanism is installed in the drying mechanism;

[0033] The drying mechanism dries the microcrystalline cellulose, the heat recovery mechanism recovers the heat of the air exhausted by the drying mechanism, and the inner wall cleaning mechanism cleans the inner wall of the drying mechanism;

[0034] The drying mechanism includes a drying chamber 1, a heating box 2, an exhaust pump 3, a delivery pipe 4, a discharge valve 5 and an atomizing nozzle 6. The drying chamber 1 is provided with a chamber, the heating box 2 is installed at the side end of the drying chamber 1, and a plurality of heating elements 7 are provided inside the heating box 2. The exhaust pump 3 is installed at the bottom end of the heating box 2, and the air intake of the exhaust pump 3 is communicated with the inside of the heating box 2. One end of the delivery pipe 4 is installed on the exhaust port of the exhaust pump 3, and the other end of the delivery pipe 4 extends to the inside of the drying chamber 1. The top end of the discharge valve 5 is installed at the bottom end of the drying chamber 1, and the atomizing nozzle 6 is installed inside the drying chamber 1.

[0035] The heat recovery mechanism includes a cleaning mechanism, a heat preservation sleeve 8, an air jet pipe 9, a filter screen 10, a feed pipe 11 and an air intake pipe 12. The bottom ends of the heat preservation sleeve 8 and the air jet pipe 9 are connected to the top of the drying bin 1. The filter screen 10 is installed at the top of the drying bin 1, and the filter screen 10 is located inside the air jet pipe 9. A plurality of air jet holes are arranged on the surface of the air jet pipe 9. The feed pipe 11 and the air intake pipe 12 are both spirally wound around the air jet pipe 9. One end of the feed pipe 11 extends to the inside of the drying bin 1 and is connected to the atomizing nozzle 6. The other end of the air intake pipe 12 extends to the right side of the heat preservation sleeve 8 and communicates with the inside of the heating box 2. The cleaning mechanism is installed at the top of the drying bin 1.

[0036] The cleaning mechanism includes a back-spray mechanism, a first motor 13, a first gear ring 14, a cleaning brush 15 and a first gear 16. The first motor 13 is fixedly mounted on the feed pipe 11 in the drying bin 1. The first gear ring 14 is rotatably mounted on the feed pipe 11 in the drying bin 1. The top end of the cleaning brush 15 is mounted on the top end of the first gear ring 14. The bottom end of the first gear 16 is connected to the output shaft of the first motor 13. The side end of the first gear 16 is meshedly connected to the side end of the first gear ring 14. The back-spray mechanism is mounted on the intake pipe 12.

[0037] The reverse spray mechanism includes an annular tube 17 and multiple groups of nozzles 18. The annular tube 17 is installed on the air intake pipe 12 through an electric control valve, and the annular tube 17 is located inside the air injection pipe 9. The multiple groups of nozzles 18 are installed at the bottom end of the annular tube 17.

[0038] The inner wall cleaning mechanism includes two sets of second gear rings 19, two sets of second motors 20, two sets of second gears 21 and multiple sets of scrapers 22. The two sets of second gear rings 19 are rotatably mounted on the inner wall of the drying bin 1, the two sets of second motors 20 are fixedly mounted on the inner wall of the drying bin 1, the two sets of second gears 21 are respectively mounted on the output shafts of the two sets of second motors 20, and the two sets of second gears 21 are respectively meshed and connected with the two sets of second gear rings 19, and the top and bottom ends of the multiple sets of scrapers 22 are respectively mounted on the two sets of second gear rings 19;

[0039] A filter box 23 is provided at the top of the air intake pipe 12;

[0040] The air is filtered through the filter box 23 to reduce the dust entering the air inlet pipe 12, the microcrystalline cellulose is discharged into the atomizing nozzle 6 through the feed pipe 11, and the microcrystalline cellulose is atomized and sprayed into the interior of the drying chamber 1 through the atomizing nozzle 6, and the air is sucked into the heating box 2 by opening the exhaust pump 3, so that the multiple groups of heating elements 7 heat the air, and then the air is sprayed into the interior of the drying chamber 1 through the conveying pipe 4 to dry the atomized microcrystalline cellulose, and then the dried microcrystalline cellulose in the drying chamber 1 is discharged by opening the discharge valve 5, and the excess hot air in the drying chamber 1 passes through 10 into the jet pipe 9, and the hot air is sprayed onto the surface of the feed pipe 11 and the air inlet pipe 12 through the multiple groups of nozzles on the jet pipe 9, so that the hot air preheats the microcrystalline cellulose in the feed pipe 11 and the air in the air inlet pipe 12, and the filter is cleaned by the cleaning mechanism. The dried microcrystalline cellulose on the filter 10 is cleaned, and the first motor 13 is turned on, and the first gear 16 is meshed with the first gear ring 14 for transmission, so that the cleaning brush 15 rotates to clean the dust on the filter 10 and reduce the accumulation of microcrystalline cellulose on the filter 10. When the first motor 13 is damaged, the electric control valve is opened to allow part of the air in the air intake pipe 12 to enter the annular pipe 17, and the air is sprayed to the filter 10 through multiple groups of nozzles 18 to clean the microcrystalline cellulose on the filter 10, so that some positions on the filter 10 are kept clean and the equipment is kept running. At the same time, the two groups of second motors 20 are turned on, and the two groups of second gears 21 are respectively meshed with the two groups of second gear rings 19 for transmission, so that the two groups of second gear rings 19 drive the multiple groups of scrapers 22 to rotate, and the microcrystalline cellulose on the inner wall of the drying bin 1 is scraped off by the multiple groups of scrapers 22, thereby improving the practicability of the equipment.

[0041] The heating box 2, exhaust pump 3, heating element 7, first motor 13 and second motor 20 of the spray drying device for microcrystalline cellulose production of the utility model are purchased on the market, and technicians in the industry only need to install and operate them according to the accompanying instruction manual, without the need for technicians in the field to make creative efforts.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A spray drying device for producing microcrystalline cellulose, comprising a drying mechanism; characterized in that: It also includes a heat recovery mechanism and an inner wall cleaning mechanism, wherein the heat recovery mechanism is installed on the drying mechanism and the inner wall cleaning mechanism is installed in the drying mechanism; The drying mechanism dries the microcrystalline cellulose, the heat recovery mechanism recovers the heat of the air exhausted by the drying mechanism, and the inner wall cleaning mechanism cleans the inner wall of the drying mechanism.

2. The spray drying device for producing microcrystalline cellulose according to claim 1, characterized in that: The drying mechanism comprises a drying chamber (1), a heating box (2), an exhaust pump (3), a delivery pipe (4), a discharge valve (5) and an atomizing nozzle (6); a chamber is arranged inside the drying chamber (1); the heating box (2) is mounted on the side end of the drying chamber (1), and a plurality of heating elements (7) are arranged inside the heating box (2); the exhaust pump (3) is mounted on the bottom end of the heating box (2), and the air intake of the exhaust pump (3) is communicated with the inside of the heating box (2); one end of the delivery pipe (4) is mounted on the exhaust port of the exhaust pump (3), and the other end of the delivery pipe (4) extends to the inside of the drying chamber (1); the top end of the discharge valve (5) is mounted on the bottom end of the drying chamber (1), and the atomizing nozzle (6) is mounted inside the drying chamber (1).

3. The spray drying device for producing microcrystalline cellulose according to claim 2, characterized in that: The heat recovery mechanism comprises a cleaning mechanism, a heat preservation sleeve (8), an air jet pipe (9), a filter screen (10), a feed pipe (11) and an air intake pipe (12); the bottom ends of the heat preservation sleeve (8) and the air jet pipe (9) are connected to the top end of the drying bin (1); the filter screen (10) is installed at the top end of the drying bin (1), and the filter screen (10) is located inside the air jet pipe (9); a plurality of groups of air jet holes are arranged on the surface of the air jet pipe (9); the feed pipe (11) and the air intake pipe (12) are both spirally wound on the air jet pipe (9); one end of the feed pipe (11) extends to the inside of the drying bin (1) and is connected to the atomizing nozzle (6); the other end of the air intake pipe (12) extends to the right side of the heat preservation sleeve (8) and is communicated with the inside of the heating box (2); and the cleaning mechanism is installed at the top of the drying bin (1).

4. The spray drying device for producing microcrystalline cellulose according to claim 3, characterized in that: The cleaning mechanism comprises a back-spray mechanism, a first motor (13), a first gear ring (14), a cleaning brush (15) and a first gear (16); the first motor (13) is fixedly mounted on a feed pipe (11) in a drying bin (1); the first gear ring (14) is rotatably mounted on the feed pipe (11) in the drying bin (1); the top end of the cleaning brush (15) is mounted on the top end of the first gear ring (14); the bottom end of the first gear (16) is connected to an output shaft of the first motor (13); and the side end of the first gear (16) is meshedly connected to the side end of the first gear ring (14); and the back-spray mechanism is mounted on an intake pipe (12).

5. The spray drying device for producing microcrystalline cellulose according to claim 4, characterized in that: The reverse spray mechanism comprises an annular tube (17) and a plurality of nozzles (18); the annular tube (17) is installed on the air intake pipe (12) through an electric control valve, and the annular tube (17) is located inside the air injection pipe (9); and the plurality of nozzles (18) are installed at the bottom end of the annular tube (17).

6. The spray drying device for producing microcrystalline cellulose according to claim 2, characterized in that: The inner wall cleaning mechanism comprises two groups of second gear rings (19), two groups of second motors (20), two groups of second gears (21) and a plurality of scrapers (22). The two groups of second gear rings (19) are rotatably mounted on the inner wall of the drying bin (1), the two groups of second motors (20) are fixedly mounted on the inner wall of the drying bin (1), the two groups of second gears (21) are respectively mounted on the output shafts of the two groups of second motors (20), and the two groups of second gears (21) are respectively meshed and connected with the two groups of second gear rings (19), and the top ends and bottom ends of the plurality of scrapers (22) are respectively mounted on the two groups of second gear rings (19).

7. The spray drying device for producing microcrystalline cellulose according to claim 3, characterized in that: A filter box (23) is provided on the top of the air inlet pipe (12).

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