A dynamic tubular reactor

Abstract

A kind of dynamic tubular reactor, belong to chemical equipment field, including motor, agitator, reaction tank, heat exchange pipe, reactant material import, product material outlet, agitator includes stirring shaft and stirring blade, stirring shaft one end is equipped with stirring blade, motor is connected to the other end of stirring shaft;Reaction tank is equipped with inner cylinder, inner cylinder will be divided into reaction area and reflux area by reaction tank;Inner cylinder inside is equipped with partition, partition will be divided into stirring area and heat exchange area from top to bottom by reaction area, reaction tank upper lateral wall is equipped with blocking structure, blocking structure extends to the above stirring area, for blocking reaction liquid rising;Reactant material import is arranged in the stirring area inner cylinder upper lateral wall, product material outlet is arranged on the upper lateral wall of reaction tank, the tubular reactor provided by the utility model can solve the vibration problem generated in the stirring process of dynamic tubular reactor, and greatly improve heat exchange efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment, and specifically relates to a dynamic tubular reactor. Background Technology

[0002] Dynamic tubular reactors are among the most commonly used reactors in the chemical industry. Compared to the low mass and heat transfer efficiency of batch reactors, tubular reactors have a smaller liquid holdup and, with the addition of a stirrer, greatly improve heat transfer efficiency and are more conducive to achieving intrinsic safety. However, during the stirring process in a dynamic tubular reactor, the rotating stirrer causes the reaction liquid to move upwards along the inner wall of the reactor, resulting in a lower liquid level at the stirrer location. This creates a funnel-like shape in the reaction liquid, leading to a gas-liquid interface at the contact point between the stirring shaft and the liquid surface. Here, the resistance from the gas phase to the stirring shaft is low, while the resistance from the liquid phase is high, resulting in different resistances experienced by the stirring shaft during rotation. This difference in resistance causes vibration in the reactor during stirring. Utility Model Content

[0003] To address the problems in the background art, this utility model provides a dynamic tubular reactor, including a motor, a stirrer, a reaction vessel, a heat exchange tube, a reactant inlet, and a product outlet. The stirrer includes a stirring shaft and stirring blades, with stirring blades at one end of the stirring shaft and the motor connected to the other end of the stirring shaft. The reaction vessel has an inner cylinder that divides the reaction vessel into a reaction zone and a reflux zone. A partition plate is provided inside the inner cylinder, dividing the reaction zone from top to bottom into a stirring zone and a heat exchange zone. A blocking structure is installed on the upper side wall of the reaction vessel, extending above the stirring zone to prevent the reaction liquid from rising. The reactant inlet is located on the upper side wall of the inner cylinder within the stirring zone, and the product outlet is located on the upper part of the side wall of the reaction vessel.

[0004] As a preferred embodiment, the stirring blades are disposed within the stirring area, the heat exchange tubes are disposed within the heat exchange area, and the heat exchange area is provided with staggered baffles; the volume of the stirring area is smaller than the volume of the heat exchange area.

[0005] As a preferred embodiment, the heat exchange zone is provided with a heat exchange medium inlet and a heat exchange medium outlet, with the outlet positioned higher than the inlet; the heat exchange medium inlet and outlet pass through the reflux zone and are connected to the heat exchange zone.

[0006] As a preferred method, the partition plate is welded to the inner cylinder sidewall circumferentially, and the partition plate surface is provided with multiple through holes, in which the heat exchange tubes are installed.

[0007] As a preferred method, a sealing plate is provided at the bottom of the heat exchange area of ​​the inner cylinder. The sealing plate has multiple through holes, and the heat exchange tubes are installed in the through holes. The sealing plate is fixedly connected to the inner wall of the reaction vessel through a support frame to support the inner cylinder.

[0008] As a preferred embodiment, a baffle plate is also included, which is installed on the upper surface of the partition plate, with the upper end of the baffle plate inclined toward the side wall of the reaction vessel.

[0009] As a preferred embodiment, the barrier structure includes a barrier plate and a mounting plate. The mounting plate is welded to the side wall of the reaction vessel, and the mounting plate and the barrier plate are connected by bolts. The installation height of the barrier plate is higher than the height of the stirring blades.

[0010] As a preferred approach, the reactant inlet is connected to the stirring zone through the reflux zone; the product outlet is connected to the reflux zone through the reaction tank wall.

[0011] As a preferred embodiment, a heat exchange jacket is provided outside the reaction vessel, a baffle is provided between the heat exchange jacket and the reaction vessel, and a jacket medium inlet is provided on the heat exchange jacket.

[0012] As a preferred embodiment, temperature measuring ports are provided at both the inlet and outlet of the heat exchange tube; and / or, the outlet of the product material at the inlet of the reactant material is set at a height higher than the inlet height of the reactant material.

[0013] Compared with the prior art, the advantages of this utility model are: 1. The dynamic tubular reactor provided by this utility model divides the entire inner cavity of the reaction tank into a reaction zone and a circulation reflux zone through the setting of the inner cylinder, so as to realize the circulation of the reactant material inside the reaction tank; at the same time, a baffle plate is set at the upper part of the reaction zone. When the liquid rises to the height of the baffle plate, the baffle plate can cut off the liquid, so that the liquid returns to the stirring zone, thus preventing the stirring shaft from causing the reactor to vibrate during the stirring process.

[0014] 2. The dynamic tubular reactor provided by this utility model has its internal reaction vessel divided into a stirring zone and a heat exchange zone by a partition plate. The volume ratio of the heat exchange zone is greater than that of the stirring zone. This design allows the materials produced in the reaction to be directly heated during the reaction process. By designing the reaction liquid to flow through the tube side and the heat exchange medium to flow through the shell side, the reaction liquid is divided into multiple small volume units, increasing the specific surface area for heat exchange of the reaction liquid. At the same time, the cooperation between the heat exchange zone and the heat exchange jacket realizes both internal and external heat exchange of the reaction, improving the heat exchange efficiency. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a dynamic tubular reactor; Figure 2 for Figure 1 A top view of the reaction vessel and related components; Figure 3 for Figure 1 Enlarged view of point A in the middle.

[0017] Attached Figure

[0018] 1. Motor; 2. Agitator; 201. Agitator shaft; 202. Agitator blades; 3. Reaction vessel; 4. Heat exchange tube; 5. Reactant inlet; 6. Product outlet; 7. Inner cylinder; 8. Divider plate; 9. Baffle plate; 10. Mounting plate; 11. Guide plate; 12. Sealing plate; 13. Support frame; 14. Heat exchange medium inlet; 15. Heat exchange medium outlet; 16. Heat exchange jacket; 17. Baffle plate; 18. Jacket medium inlet; 19. Jacket medium outlet; 20. Temperature measuring port; 21. Baffle layer. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Example

[0022] As attached Figure 1-3 As shown, a dynamic tubular reactor includes a motor 1, a stirrer 2, a reaction tank 3, a heat exchange tube 4, a reactant inlet 5, and a product outlet 6. The stirrer 2 includes a stirring shaft 201 and stirring blades 202. One end of the stirring shaft 201 is provided with stirring blades 202, and the motor 1 is connected to the other end of the stirring shaft 201. The reaction tank 3 is provided with an inner cylinder 7, which divides the reaction tank 3 into a reaction zone and a reflux zone. The inner cylinder 7 divides the interior of the reaction tank 3 into a reaction zone and a reflux zone. When the stirrer 2 stirs, it can stir the reaction liquid and push the reaction liquid downward to return it from the reflux zone to the reaction zone, thus realizing the circulation of the reaction liquid in the reaction tank 3. In this embodiment, a propeller-type stirrer is preferably used, that is, a stirrer with stirring and propulsion functions. The reaction zone is the area inside the inner wall of the inner cylinder 7 inside the reaction tank 3, and the area between the outer wall of the inner cylinder 7 and the inner side wall of the reaction tank 3 is the reflux zone.

[0023] To achieve internal heat exchange in the reaction vessel 3, a partition plate 8 is designed in the inner cylinder 7 to divide the reaction area into a stirring area and a heat exchange area from top to bottom, thus separating the stirring area and the heat exchange area. The stirring blades 202 are set in the stirring area, and the heat exchange tubes 4 are set in the heat exchange area. A baffle plate 9 is installed on the upper side wall of the reaction vessel 3, extending above the stirring area to prevent the reaction liquid from rising. Alternatively, an mounting plate 10 can be welded to the upper side wall of the reaction vessel 3, and the mounting plate 10 is connected to the baffle plate 9 by bolts. The baffle plate 9 is installed vertically, and its installation height is higher than that of the stirring blades 202. This design ensures that the baffle plate 9 will not affect the stirring of the stirring blades 202. The setting of the baffle plate 9 allows the reaction liquid rising along the inner cylinder 7 wall during stirring to fall back into the stirring area, so that the stirrer 2 is always in the process of liquid stirring, solving the problem of reactor vibration caused by the difference in resistance between the gas and liquid phases during stirring.

[0024] The volume of the stirring zone is smaller than that of the heat exchange zone. This design, which reduces the reaction zone and increases the heat exchange zone, allows the heat generated by the reaction in the stirring zone to be quickly carried away, thus solving the problem of local overheating. The stirring zone is the reaction zone of the inner cylinder 7 above the upper end face of the partition plate 8. The heat exchange zone is the area formed by the partition plate 8, the sealing plate 12, the heat exchange tube 4, and the inner wall of the inner cylinder 7. The partition plate 8 and the sealing plate 12 are respectively provided with through holes. The heat exchange tube 4 passes through the through holes on the partition plate 8 and the sealing plate 12. The heat exchange medium enters the heat exchange zone through the heat exchange medium inlet 14 and then flows out through the heat exchange medium outlet 15. The reaction liquid in the stirring zone enters the heat exchange tube 4 and passes through the heat exchange zone to achieve heat exchange. The reaction liquid after heat exchange is stirred... Under the thrust of the stirrer 2, the mixture enters the reflux zone, where some is extracted and some re-enters the stirring zone for reaction. The heat exchange medium inlet 14 and outlet 15 pass through the wall of the reaction tank 3 and connect to the heat exchange zone. The outlet 15 is positioned higher than the inlet 14. This design ensures that the flow direction of the heat exchange medium is opposite to that of the reaction liquid, i.e., reverse heat exchange, which maximizes the utilization of the temperature difference between the hot and cold fluids and improves heat exchange efficiency. To support the inner cylinder 7, multiple support frames 13 are provided around the sealing plate 12 and connected to the inner wall of the reaction tank 3. There are gaps between the support frames 13 to allow the reaction liquid to pass through these gaps from the reaction zone into the reflux zone.

[0025] To enhance the heat exchange effect, a baffle layer 21 is set between the heat exchange tubes 4 in the heat exchange area. One side of the baffle layer 21 is fixed to one side of the inner wall of the inner cylinder 7, and the other side of the baffle layer 21 is fixed between the heat exchange tubes 4. That is, the length of the baffle layer 21 is less than the diameter of the inner cylinder, and the adjacent baffle layers 21 are staggered. This design plays a guiding role in the flow direction of the heat exchange medium.

[0026] In order to allow the reaction liquid in the stirring zone to enter the heat exchange tube 4, a guide plate 11 is provided on the upper end face of the partition plate 8, and the upper end of the guide plate 11 is inclined towards the side wall of the reaction tank 3.

[0027] The reactant inlet 5 is located on the upper side wall of the cylinder 7 within the stirring area, and the product outlet 6 is located on the side wall of the reaction tank 3. The height of the product outlet 6 is higher than that of the reactant inlet 5. This design ensures a large liquid hold-up, guaranteeing the reactor's circulation capacity, whether discharging under pressure or overflow. Furthermore, during the circulation of the reaction liquid, the reactant material only exits through the outlet after completing one cycle, preventing fresh reactant material from being removed immediately upon entering the reaction. The height of the reactant inlet 5, higher than that of the stirring blades 202, prevents the reactant material from entering the heat exchange tubes directly without being mixed.

[0028] The reactor 3 is provided with a heat exchange jacket 16 on the outside. A baffle 11 is provided between the heat exchange jacket 16 and the outer wall of the reactor 3. The heat exchange jacket 16 is provided with a jacket medium inlet 18 and a jacket medium outlet 19. The jacket medium outlet 19 is higher than the jacket medium inlet 18. The purpose of this external heat exchange jacket 16 is to cooperate with the heat exchange area inside the reactor to achieve a combination of heat exchange from the inside to the outside, thereby improving the heat exchange efficiency.

[0029] In order to detect the temperature of the reaction liquid during the reaction process, temperature measuring ports 20 are provided at the inlet and outlet of heat exchange tube 4 to detect the temperature of the reaction liquid before entering the heat exchange tube 4 and after heat exchange, so as to facilitate the detection of the temperature of the reaction liquid and the heat exchange capacity of the heat exchange area.

[0030] The above are merely specific embodiments of this disclosure, enabling those skilled in the art to understand or implement this disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dynamic tubular reactor, comprising a motor (1), a stirrer (2), a reaction vessel (3), a heat exchange tube (4), a reactant inlet (5), and a product outlet (6), characterized in that, The stirrer (2) includes a stirring shaft (201) and stirring blades (202). The stirring blades (202) are provided at one end of the stirring shaft (201), and the motor (1) is connected to the other end of the stirring shaft (201). The reaction tank (3) is provided with an inner cylinder (7), which divides the reaction tank (3) into a reaction zone and a reflux zone. The inner cylinder (7) is provided with a partition plate (8), which divides the reaction zone into a stirring zone and a heat exchange zone from top to bottom. A blocking structure is installed on the upper side wall of the reaction tank (3), which extends above the stirring zone to block the reaction liquid from rising. The reaction material inlet (5) is located on the upper side wall of the inner cylinder (7) of the stirring zone, and the generated material outlet (6) is located on the upper side wall of the reaction tank (3).

2. The dynamic tubular reactor according to claim 1, characterized in that, The stirring blade (202) is disposed in the stirring area, the heat exchange tube (4) is disposed in the heat exchange area, and the heat exchange area is provided with staggered baffles (21); the volume of the stirring area is smaller than the volume of the heat exchange area.

3. A dynamic tubular reactor according to claim 1, characterized in that, The heat exchange area is provided with a heat exchange medium inlet (14) and a heat exchange medium outlet (15). The position height of the heat exchange medium outlet (15) is higher than that of the heat exchange medium inlet (14). The heat exchange medium inlet (14) and the heat exchange medium outlet (15) pass through the reflux area and communicate with the heat exchange area.

4. A dynamic tubular reactor according to claim 1, characterized in that, The partition plate (8) is welded to the side wall of the inner cylinder (7) in the circumferential direction. The partition plate (8) has multiple through holes on its surface, and the heat exchange tube (4) is installed in the through holes.

5. A dynamic tubular reactor according to claim 4, characterized in that, The bottom of the heat exchange area of ​​the inner cylinder (7) is provided with a sealing plate (12), and the sealing plate (12) is provided with multiple through holes. The heat exchange tube (4) is installed in the through holes. The sealing plate (12) is fixedly connected to the inner wall of the reaction tank (3) through a support frame (13) to support the inner cylinder (7). There is a gap between the support frame (13) and the support frame (13) so that the reaction liquid can enter the reflux area from the reaction area through the gap.

6. A dynamic tubular reactor according to claim 1, characterized in that, It also includes a guide plate (11), which is installed on the upper surface of the partition plate (8), and the upper end of the guide plate (11) is inclined toward the side wall of the reaction vessel (3).

7. A dynamic tubular reactor according to claim 1, characterized in that, The blocking structure includes a blocking plate (9) and a mounting plate (10). The mounting plate (10) is welded to the side wall of the reaction vessel (3). The mounting plate (10) and the blocking plate (9) are connected by bolts. The installation height of the blocking plate (9) is higher than the height of the stirring blade (202).

8. A dynamic tubular reactor according to claim 1, characterized in that, The reactant inlet (5) passes through the reflux zone and is connected to the stirring zone; the product outlet (6) passes through the wall of the reaction vessel (3) and is connected to the reflux zone.

9. A dynamic tubular reactor according to claim 1, characterized in that, The reaction vessel (3) is provided with a heat exchange jacket (16), and a baffle plate (17) is provided between the heat exchange jacket (16) and the reaction vessel (3). The heat exchange jacket (16) is provided with a jacket medium inlet (18) and a jacket medium outlet (19). The location of the jacket medium outlet (19) is as follows.

10. A dynamic tubular reactor according to claim 1, characterized in that, Temperature measuring ports (20) are provided at the inlet and outlet of the heat exchange tube (4); and / or, the height of the generated material outlet (6) is higher than the height of the reactant inlet (5); and / or, the height of the reactant inlet (5) is higher than the height of the stirring blade (202).

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