Nitrification device for granular nitrocotton production

Abstract

The utility model relates to the technical field of nitrocotton production equipment, and discloses a nitration device for producing granular nitrocotton, the nitration device for producing granular nitrocotton comprises a reaction tube and a stirring assembly, the tube body of the reaction tube spirally extends along a first direction, the two ends of the reaction tube are respectively provided with a feed port and a discharge port, and the stirring assembly is arranged in the reaction tube. The feeding port is used for feeding materials, and the discharging port is used for discharging the materials; the stirring assembly comprises a stirring paddle, and the stirring paddle is rotationally arranged in the reaction tube and is used for stirring the materials in the reaction tube. The material distribution is relatively uniform, the flowing smoothness is relatively good, and the reaction time is relatively short.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrocellulose production equipment, in particular to a nitrification device for producing granular nitrocellulose. Background Art

[0002] Nitrocellulose (also called nitrocellulose) is the main component of single-base propellants, double-base propellants, triple-base propellants, modified double-base propellants, cross-linked modified double-base propellants and composite modified double-base propellants. At present, the existing nitrification machines are U-type nitrification machines or tower nitrification machines with multiple tubes in series, which are suitable for the preparation of nitrocellulose using flocculent refined cotton as raw materials, but not suitable for the preparation of nitrocellulose using granular cellulose as raw materials. When nitrifying granular cellulose, the material is easy to float to the surface, the overall reaction time of the material and the uneven distribution of the material in the reactor will lead to problems such as poor uniformity of product nitration quality.

[0003] Therefore, there is an urgent need for a nitrification device for producing granular nitrocellulose to solve the above problems. Utility Model Content

[0004] Based on the above, the purpose of the utility model is to provide a nitrification device for the production of granular nitrocellulose, which has a more uniform material distribution, better flow smoothness and a shorter reaction time.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A nitrification device for producing granular nitrocellulose, comprising:

[0007] A reaction tube, wherein the tube body of the reaction tube spirally extends along a first direction, and the two ends of the reaction tube are respectively a feed port and a discharge port, wherein the feed port is used to introduce materials, and the discharge port is used to discharge the materials;

[0008] The stirring assembly comprises a stirring paddle, which is rotatably arranged in the reaction tube and is used for stirring the material in the reaction tube.

[0009] As a preferred solution of a nitrification device for producing granular nitrocellulose, the projection of each circle of the reaction tube on the first plane is rectangular, and the first plane is perpendicular to the first direction.

[0010] As a preferred solution of a nitrification device for producing granular nitrocellulose, each circle of the reaction tube includes four tube sections that are sequentially connected and vertically arranged, and the stirring paddle is located at the connecting corner of two adjacent tube sections.

[0011] As a preferred solution of a nitrification device for producing granular nitrocellulose, at least one nitrification fume outlet is provided on the tube body of the reaction tube, and the nitrification fume outlet is used to discharge the acid fume in the reaction tube.

[0012] As a preferred solution of a nitrification device for producing granular nitrocellulose, the reaction tube spirally extending along the first direction includes a plurality of tube sections connected in sequence, and the nitr smoke outlet is located at the top of the tube section.

[0013] As a preferred solution for a nitrification device for producing granular nitrocellulose, in the direction of gravity, the feed port is arranged downward, and the discharge port is arranged upward.

[0014] As a preferred embodiment of a nitrification device for producing granular nitrocellulose, the cross section of the tube body of the reaction tube is circular.

[0015] As a preferred solution of a nitrification device for producing granular nitrocellulose, the diameter of the blade of the stirring paddle is 60%-90% of the cross-sectional diameter of the tube body of the reaction tube.

[0016] As a preferred solution of a nitrification device for producing granular nitrocellulose, the body of the reaction tube is provided with at least one nitrification smoke outlet, which is circular and has a diameter of 20%-50% of the cross-sectional diameter of the body of the reaction tube.

[0017] As a preferred solution of a nitrification device for producing granular nitrocellulose, the stirring assembly further comprises a stirring motor, the stirring motor is driven and connected to the stirring paddle, and the stirring motor can drive the stirring paddle to rotate.

[0018] The beneficial effects of the utility model are:

[0019] The utility model provides a nitrification device for producing granular nitrocellulose, which comprises a reaction tube and a stirring assembly. By rotating a stirring paddle arranged in the reaction tube, the material in the reaction tube can be stirred to improve the uniformity of the distribution of the material in the reaction tube; and the stirring can also play the role of mixing and pushing flow, further improving the consistency of the flow length of the material in the reactor, thereby improving the uniformity of the nitrification quality, effectively solving the problems of easy floating of the material, long overall reaction time of the material and uneven distribution of the material in the reaction tube. At the same time, it can also prevent the material from clogging the reaction tube, and improve the reliability and safety of the reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the structure of a reaction tube provided by an embodiment of the utility model at a first viewing angle;

[0022] Figure 2 is a schematic diagram of the structure of a reaction tube provided by an embodiment of the utility model at a second viewing angle;

[0023] Figure 3 is a schematic structural diagram of a reaction tube provided by an embodiment of the utility model at a third viewing angle;

[0024] Figure 4 It is a schematic structural diagram of a reaction tube provided by an embodiment of the utility model at a fourth viewing angle.

[0025] In the figure:

[0026] 1. Reaction tube; 11. Tube section;

[0027] 10. Feed inlet; 20. Discharge outlet; 30. Smoke outlet. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In the description of the present invention, unless otherwise specified, the meaning of "multiple" is two or more. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0032] At present, the existing nitrification machines are U-shaped nitrification machines or tower nitrification machines with multiple tubes in series, which are suitable for the preparation of nitrocellulose using flocculent refined cotton as raw materials, but are not suitable for the preparation of nitrocellulose using granular cellulose as raw materials. When nitrifying granular cellulose, the material is easy to float to the surface, and the overall reaction time of the material and the uneven distribution of the material in the reactor will lead to problems such as poor uniformity of product nitration quality.

[0033] Based on the above technical issues, such as Figures 1 to 4 As shown, this embodiment provides a nitrification device for producing granular nitrocellulose, which comprises a reaction tube 1 and a stirring assembly. The tube body of the reaction tube 1 spirally extends along a first direction (direction A in the figure), and the two ends of the reaction tube 1 are respectively a feed port 10 and a discharge port 20, the feed port 10 is used to pass materials, and the discharge port 20 is used to discharge materials; a stirring paddle is rotatably arranged in the reaction tube 1, and is used to stir the materials in the reaction tube 1. By rotatably arranging the stirring paddle in the reaction tube 1, the materials in the reaction tube 1 can be stirred, and the uniformity of the distribution of the materials in the reaction tube 1 can be improved; and the stirring can also play the role of mixing and pushing flow, further improving the consistency of the flow length of the materials in the reactor, thereby improving the uniformity of the nitrification quality, and effectively solving the problems of easy floating of materials, long overall reaction time of materials, and uneven distribution of materials in the reaction tube 1. At the same time, it can also prevent the materials from blocking the reaction tube 1, and improve the reliability and safety of the reaction.

[0034] Preferably, in the direction of gravity, the feed port 10 is set downward and the discharge port 20 is set upward. The feed port 10 opens downward and the discharge port 20 opens upward, which can effectively slow down the speed of the material at the inlet and outlet, and further enhance the uniformity of the distribution of the material at the inlet and outlet 20 and inside the reaction tube 1.

[0035] like Figure 2As shown, in this embodiment, the projection of each circle of the tube body of the reaction tube 1 on the first plane is rectangular, and the first plane is perpendicular to the first direction. It can effectively improve the consistency of the flow length of the material in the reaction tube 1 and improve the uniformity of the reaction. Exemplarily, the total length of the reaction tube 1 is 15m, and the spacing between each two adjacent circles of the tube body is 1-3m, ensuring the smooth uniformity of the flow length and flow of the material in the reaction tube 1. For example, the spacing between each two adjacent circles of the tube body is 1m, 2m or 3m, etc. Of course, in other embodiments, the projection of each circle of the tube body of the reaction tube 1 on the first plane may also be in other shapes, such as polygonal or irregular shapes, etc., which are specifically set according to actual needs.

[0036] Preferably, the cross section of the tube body of the reaction tube 1 is circular, so that the material flows more evenly in the reaction tube 1 and the flow length consistency of the material in the reaction tube 1 is ensured, thereby ensuring the uniformity of the reaction.

[0037] Specifically, each circle of the tube body of the reaction tube 1 includes four tube segments 11 that are sequentially connected and vertically arranged, and the stirring paddle is located at the connecting corner of two adjacent tube segments 11. By arranging the stirring paddle at the corner, it can play a better role in pushing flow and mixing, so that the flow length consistency of the material in the reaction tube 1 is better, the phenomenon of uneven distribution of the material in the reaction tube 1 is reduced, and the material is prevented from being blocked in the reaction tube 1, thereby improving the reliability and uniformity of the reaction.

[0038] More specifically, the stirring assembly also includes a stirring motor, which drives and connects to a stirring paddle, and the stirring motor can drive the stirring paddle to rotate. The stirring paddle is driven by the stirring motor to rotate, so as to achieve stirring of the material, which has a high degree of automation and saves time and effort.

[0039] Preferably, there are multiple stirring assemblies, and a stirring assembly is provided at the connecting corners of several adjacent two pipe sections 11, so that a stirring paddle is provided every other section in the reaction tube 1 to stir the material, thereby improving the uniformity of material distribution in the entire section of the reaction tube 1. Exemplarily, the reaction tube 1 has 7 turns of tube body, and 7 stirring assemblies are provided, and a stirring assembly is provided on each turn of tube body, which effectively improves the uniformity of material distribution. Of course, in other embodiments, the number of turns of the reaction tube 1 and the number of stirring assemblies can also be other, which are specifically set according to actual needs.

[0040] Preferably, the stirring motor is a variable frequency motor so as to adjust the rotation speed of the stirring paddle at any time to adapt to different working conditions, so as to achieve the best stirring effect on the material and improve practicality and reliability.

[0041] Furthermore, the diameter of the blade of the stirring paddle is 60%-90% of the cross-sectional diameter of the tube body of the reaction tube 1, for example, the diameter of the blade of the stirring paddle is 60%, 70%, 80% or 90% of the cross-sectional diameter of the tube body of the reaction tube 1, so that the stirring paddle has a better stirring force on the material and can make the material flow smoothly.

[0042] Optionally, the stirring paddle has a blade inclination angle of 0-90° and is a flat-paddle stirring paddle made of C4 steel.

[0043] like Figure 4 As shown, in order to prevent the smoke generated during the reaction from gathering in the reaction tube 1 and hindering the movement of the materials, at least one smoke outlet 30 is provided on the tube body of the reaction tube 1. The smoke outlet 30 is circular, and the diameter of the smoke outlet 30 is 20%-50% of the cross-sectional diameter of the tube body of the reaction tube 1. For example, the diameter of the smoke outlet 30 is 20%, 30%, 40% or 50% of the cross-sectional diameter of the tube body of the reaction tube 1. The acid smoke volatilized during the movement of the mixed acid is discharged from the reaction tube 1 through the smoke outlet 30, avoiding obstruction to the materials and ensuring the smoothness and continuity of the material flow.

[0044] Preferably, the reaction tube 1 spirally extending in the first direction comprises a plurality of circles of sequentially connected tube segments 11, and the smoke outlet 30 is located at the top of the tube segment 11. The smoke outlet 30 is located at the top of the reaction tube 1, that is, the smoke outlet 30 is located at the top tube segment 11 of one circle of the tube body, so that the smoke can naturally rise and be discharged from the smoke outlet 30. More preferably, a plurality of smoke outlets 30 are provided, and the plurality of smoke outlets 30 are correspondingly arranged on the top tube segments 11 of the plurality of circles of the tube body.

[0045] The nitration device for producing granular nitrocellulose provided in this embodiment can effectively solve the problems of long material reaction time and uneven material distribution in the reactor during the nitration process of granular cellulose, improve the flow length consistency of granular cellulose in the reactor, and improve the uniformity of its reaction.

[0046] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A nitrification device for producing granular nitrocellulose, It is characterized in that include: A reaction tube, wherein the tube body of the reaction tube spirally extends along a first direction, and the two ends of the reaction tube are respectively a feed port and a discharge port, wherein the feed port is used to introduce materials, and the discharge port is used to discharge the materials; The stirring assembly comprises a stirring paddle, which is rotatably arranged in the reaction tube and is used for stirring the material in the reaction tube.

2. The nitrification device for producing granular nitrocellulose according to claim 1, It is characterized in that The projection of each circle of the tube body of the reaction tube on the first plane is rectangular, and the first plane is perpendicular to the first direction.

3. The nitrification device for producing granular nitrocellulose according to claim 2, It is characterized in that Each circle of the reaction tube body comprises four tube sections which are sequentially connected and vertically arranged, and the stirring paddle is located at the connecting corner of two adjacent tube sections.

4. The nitrification device for producing granular nitrocellulose according to claim 1, It is characterized in that At least one smoke outlet is provided on the tube body of the reaction tube, and the smoke outlet is used to discharge the acid smoke in the reaction tube.

5. The nitrification device for producing granular nitrocellulose according to claim 4, It is characterized in that The reaction tube spirally extending along the first direction includes a plurality of tube sections connected in sequence, and the smoke outlet is located at the top of the tube section.

6. The nitrification device for producing granular nitrocellulose according to any one of claims 1 to 5, It is characterized in that In the direction of gravity, the feed port is arranged downward, and the discharge port is arranged upward.

7. The nitrification device for producing granular nitrocellulose according to claim 4, It is characterized in that The cross section of the tube body of the reaction tube is circular.

8. The nitrification device for producing granular nitrocellulose according to claim 7, It is characterized in that The diameter of the blade of the stirring paddle is 60%-90% of the cross-sectional diameter of the tube body of the reaction tube.

9. The nitrification device for producing granular nitrocellulose according to claim 7, It is characterized in that The smoke outlet is circular, and the diameter of the smoke outlet is 20%-50% of the cross-sectional diameter of the tube body of the reaction tube.

10. The nitrification device for producing granular nitrocellulose according to any one of claims 1 to 5, It is characterized in that The stirring assembly also includes a stirring motor, which is drivingly connected to the stirring paddle and can drive the stirring paddle to rotate.

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