Paddle type chemical reaction kettle

Abstract

This invention relates to the field of chemical reactor technology and discloses a paddle-type chemical reactor, including a reactor body with a flange for adding materials, which can be sealed, a supporting support and a discharge pipe, and an internal cavity for material polymerization. A drive unit is mounted on the reactor body, and a stirring unit is coaxially connected to the output shaft of the drive unit and driven by the drive unit. The end of the stirring unit extends into the cavity of the reactor body for stirring. This invention employs a novel stirrer structure, including a stirring unit and a composite paddle. The axial flow generated by the high-speed rotation of the stirring unit creates rapid vertical mixing. Due to the radial force of the stirrer, the material is radially pushed outwards and contacts the inner wall of the reactor body. Heating is achieved using the heat-conducting liquid in the jacket of the reactor body. The specific structure of the composite paddle utilizes Bernoulli's principle and the Venturi effect to absorb material near the inner wall of the reactor body.

Description

Technical Field

[0001] This invention relates to the field of chemical reactor technology, specifically a paddle-type chemical reactor. Background Technology

[0002] Traditional paddle agitators have gaps between themselves and the vessel wall, resulting in very low flow velocities near the wall surface, which easily leads to the formation of stagnant layers. During the process of raw materials moving from monomers to oligomers and then to polymers, they are heated by the jacket on the inner wall of the vessel. The temperature is higher closer to the jacket, and the low flow velocity in this area easily leads to scaling. To improve this phenomenon, existing technologies use devices that add wall scrapers to scrape the inner wall during agitation, such as the one disclosed in (CN117443326A). Although this can reduce scaling, it can scratch the inner wall of the vessel. In addition, since the scraper is in direct contact with the inner wall at a high temperature, scaling may frequently occur on the scraper blades. Summary of the Invention

[0003] The purpose of this invention is to provide a paddle-type chemical reactor to solve the problems mentioned in the background art.

[0004] Paddle-type chemical reactors, including: The vessel body has a flange for adding materials and can be sealed, and also includes a matching support and a discharge pipe, with an internal cavity for material polymerization; The drive unit is mounted on the vessel body. A stirring section is coaxially connected to the output shaft of the drive section and is driven by the drive section. The end of the stirring section extends into the cavity of the vessel body for stirring. A composite impeller, connected to the stirring unit, comprises at least two impellers arranged in a circular array around the stirring unit's axis. Specifically, each composite impeller has a flow guide channel and a strip-shaped channel communicating with the flow guide channel. The horizontal cross-section of the flow guide channel first decreases in size and then increases in size according to the liquid flow direction. The strip-shaped channel is located on the side of the composite impeller near the inner wall of the reactor body. Utilizing the Venturi effect, the pressure at the front end of the flow guide channel is increased, thereby increasing the flow velocity at the rear. The high flow velocity generates low pressure, allowing material in the high-pressure zone to enter the low-pressure zone through the strip-shaped channel and discharge along the flow guide channel under the inertia of the material. This achieves the inward conveying of material near the inner wall of the reactor body, improving heat exchange efficiency and reducing scaling on the inner wall of the reactor body during polymerization.

[0005] Preferably, the composite propeller includes a front section, a middle section, and a tail section, and the flow guiding channel is formed in the front section, the middle section, and the tail section. The distance between the outer arc wall surface of the assembled composite propeller and the inner wall surface of the vessel body is X, and X is not greater than the width of the internal channel of the middle section.

[0006] Preferably, the direction of the nozzle at the end of the tail section is tangent to the virtual K-circle, the virtual K-circle is concentric with the vessel body and its radius is 30% to 70% of the radius of the vessel body.

[0007] Preferably, a protruding guide portion is provided at the front end of the front section near the inner wall of the vessel body, and the guide portion has the same curvature as the outer wall of the composite sleeve.

[0008] Preferably, a settling groove is provided on the outer wall of the composite propeller, and a vertical liquid suction groove is provided at the settling groove. The liquid suction groove is connected to the channel in the middle section. After the composite propeller rotates, the pressure at the front end increases and the flow rate increases rapidly in the middle section, causing the pressure at the liquid suction groove to drop sharply. As a result, the material outside the composite propeller quickly enters the composite propeller through the liquid suction groove and is discharged from the tail section.

[0009] Preferably, the inner wall of the middle section is provided with inwardly protruding pressure fins at intervals, the pressure fins form a narrow opening between them, and the liquid suction groove is located on the rear side of the pressure fins.

[0010] Preferably, the liquid suction tank is a tank that extends obliquely into the middle section, which helps to reduce turbulence caused by external materials entering the material at the middle section.

[0011] Preferably, the end of the stirring part is further fixedly provided with a stirring paddle, and the stirring paddle is provided with at least two pieces symmetrically. Specifically, the stirring paddle stirs the mixture after the stirring part is driven to rotate by the driving part.

[0012] Preferably, a fixing sleeve is fixedly provided on the composite paddle, and the fixing sleeve and bolts are used to fix it to the stirring bracket, and the stirring bracket is fitted and fixed on the stirring part.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: A novel agitator structure is adopted, including a stirring section and a composite impeller. The axial flow of the stirring section during high-speed rotation forms rapid vertical mixing. Due to the radial force of the agitator, the material is radially pushed outwards and contacts the inner wall of the vessel body. Heating is achieved using the heat-conducting liquid in the jacket of the inner wall of the vessel body. The specific structure of the composite impeller utilizes Bernoulli's principle and the Venturi effect to absorb material near the inner wall of the vessel body and spray it towards a position closer to the center of the vessel body. Compared with the material mixing flow direction in the prior art, this device can greatly improve the efficiency of material exchange inwards from the part near the inner wall of the vessel body (that is, the part more easily heated by the inner wall of the vessel body). This not only improves the uniformity of heating but also effectively reduces scaling on the inner wall of the vessel body. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention (excluding the top of the vessel); Figure 3 yes Figure 2 Top view; Figure 4 yes Figure 2 A magnified view of a portion of the top view; Figure 5 yes Figure 4 A magnified structural diagram at point A; Figure 6 This is a schematic diagram of the composite propeller 14 of the present invention; Figure 7 This is a schematic diagram of the composite propeller 14 of the present invention (from another perspective). Figure 8 This is a structural schematic diagram (section) of the composite propeller 14 of the present invention. Figure 9 yes Figure 8 A schematic diagram of the fluid flow; Figure 10 This is a schematic diagram of radial fluid flow in a conventional stirred tank in the prior art.

[0015] The labels in the attached diagram are as follows: 10, vessel body; 11, drive unit; 12, stirring unit; 13, stirring support; 14, composite paddle; 15, fixed jacket; 16, front section; 17, middle section; 18, tail section; 19, guide section; 20, settling tank; 21, liquid suction tank; 22, pressurizing fins; 23, stirring paddle. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figure 1-9 The present invention provides a paddle-type chemical reactor, comprising: The vessel body 10 has a flange for adding materials and can be sealed. It also includes a supporting support and a discharge pipe. The interior has a cavity for material polymerization. Specifically, it is a common technical structure in the art and will not be described in detail here. The drive unit 11 is mounted on the vessel body 10. The stirring part 12 is coaxially connected to the output shaft of the driving part 11 and is driven by the driving part 11. The end of the stirring part 12 extends into the cavity of the vessel body 10 for stirring. The composite impeller 14 is connected to the stirring part 12. At least two composite impellers 14 are provided and arranged in a ring array at equal angles around the rotation axis of the stirring part 12. Specifically, the composite impeller 14 has a flow guide channel and a strip-shaped channel communicating with the flow guide channel. The horizontal cross-section of the flow guide channel first decreases and then increases according to the direction of liquid flow. The strip-shaped channel is located on the side of the composite impeller 14 near the inner wall of the reactor body 10. Utilizing the Venturi effect, the pressure at the front end of the flow guide channel is increased first, increasing the flow velocity at the rear. The high flow velocity generates low pressure, so that the material in the high-pressure zone enters the low-pressure zone through the strip-shaped channel and is discharged along the flow guide channel under the action of material inertia. This realizes the inward conveying of material near the inner wall of the reactor body 10, improving heat exchange efficiency and reducing scaling on the inner wall of the reactor body 10 during the polymerization process.

[0018] Preferably, the composite propeller 14 includes a front section 16, a middle section 17, and a tail section 18, and the flow guiding channel is formed within the front section 16, the middle section 17, and the tail section 18 (e.g., Figure 6 , 7 (8, 9) The distance between the outer arc wall of the composite paddle 14 after assembly and the inner wall of the vessel body 10 is X, and X is not greater than the width of the internal channel of the middle section 17. Specifically, by setting the gap, direct contact with the inner wall of the vessel body 10 can be avoided, thus preventing the composite paddle 14 from absorbing heat quickly. Furthermore, an area that is easily sucked in is formed between the composite paddle 14 and the inner wall of the vessel body 10. When the composite paddle 14 rotates rapidly inside the vessel body 10, the pressure in the area between the middle section 17 and the vessel body 10 is higher than the pressure inside the middle section 17. The Venturi effect is used to quickly draw the material in the area between the middle section 17 and the vessel body 10 into the middle section 17, and then move it through the guide channel.

[0019] Preferably, the nozzle direction at the end of the tail section 18 is tangent to the virtual K-circle, the virtual K-circle is concentric with the vessel body 10 and its radius is 30% to 70% of the radius of the vessel body 10 (e.g., Figure 4 Specifically, this arrangement allows the material discharged by the composite paddle 14 to flow rapidly toward the middle ring of the vessel body 10, accelerating the heat exchange between the wall-adhering area and the interior of the vessel body 10, which is beneficial for the polymerization of the material.

[0020] Preferably, a protruding guide portion 19 is provided at the front end of the front section 16 near the inner wall of the vessel body 10. The guide portion 19 has the same curvature as the outer wall of the composite propeller 14, so that the guide portion 19 can be used to guide and divide the flow first during the rotation of the composite propeller 14.

[0021] Preferably, a settling groove 20 is provided on the outer wall of the composite propeller 14, and a vertical liquid suction groove 21 is provided at the settling groove 20. The liquid suction groove 21 is connected to the inner channel of the middle section 17. Figure 9 When the composite paddle 14 rotates, the pressure at the front end increases, and the flow rate increases rapidly at the middle section 17, causing a sudden drop in pressure at the suction tank 21. As a result, the material outside the composite paddle 14 quickly enters the composite paddle 14 through the suction tank 21 and is discharged from the tail section 18. During this process, the part of the material that was originally thrown against the inner wall of the vessel body 10 by inertial force is sucked in by the composite paddle 14 and discharged towards the center of the vessel body 10 after sufficient contact and heat absorption. This accelerates the heat exchange of the material and reduces the scaling on the inner wall of the vessel body 10.

[0022] Preferably, such as Figure 8 , 9 In the middle section 17, inwardly protruding pressure fins 22 are provided at intervals on the inner wall, and narrow openings are formed between the pressure fins 22, such as... Figure 9 Furthermore, the liquid suction groove 21 is located on the rear side of the pressurizing fins 22 (here, rear side refers to the front and rear sides distinguished by the material flow direction). In this way, when the material entering from the front section 16 passes through the middle section 17, it will pass through several narrow openings formed by the pressurizing fins 22 and further increase the flow rate and reduce the high pressure at that point. The liquid suction groove 21 is located here to further accelerate the pressure difference and increase the speed at which the material outside the composite paddle 14 is sucked into the composite paddle 14.

[0023] Preferably, the liquid suction groove 21 is a groove that extends obliquely into the middle section 17, such as... Figure 9 This helps to reduce the turbulence caused by external materials entering the material at the middle section 17, and avoids speed reduction and unnecessary minor vibrations.

[0024] Preferably, the end of the stirring part 12 is also fixedly provided with a stirring paddle 23, and the stirring paddle 23 is provided with at least two pieces symmetrically. Specifically, the stirring paddle 23 stirs after the stirring part 12 is driven to rotate by the driving part 11.

[0025] Preferably, a fixing sleeve 15 is fixedly provided on the composite paddle 14, and is fixed to the stirring bracket 13 by the fixing sleeve 15 and bolts, and the stirring bracket 13 is fitted and fixed on the stirring part 12.

[0026] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A paddle-type chemical reactor, characterized in that, include: The vessel body (10) has a flange for adding materials and is sealable. It also includes a matching discharge pipe and has an internal cavity for material polymerization. A drive unit (11) is mounted on the vessel body (10). A stirring unit (12) is coaxially connected to the output shaft of the drive unit (11) and driven by the drive unit (11). The end of the stirring unit (12) extends into the cavity of the vessel body (10) for stirring. A composite paddle (14) is connected to the stirring unit (12). At least two composite paddles (14) are provided and are arranged around the rotating shaft of the stirring unit (12). The composite paddle (14) is arranged in a shaped array and has a flow channel and a strip-shaped channel communicating with the flow channel. The horizontal cross section of the flow channel first narrows and then widens along the liquid flow direction. The strip-shaped channel is located on the side of the composite paddle (14) near the inner wall of the vessel body (10). The composite paddle (14) includes a front section (16), a middle section (17), and a tail section (18). A settling groove (20) is provided on the outer wall of the composite paddle (14). A vertical liquid suction groove (21) is provided at the settling groove (20). The liquid suction groove (21) is communicating with the inner channel of the middle section (17). The flow channel is formed in the front section (16), middle section (17) and tail section (18). The distance between the outer arc wall of the composite paddle (14) after assembly and the inner wall of the vessel body (10) is X, and X is not greater than the width of the internal channel of the middle section (17).

2. The paddle-type chemical reactor according to claim 1, characterized in that: The nozzle direction at the end of the tail section (18) is tangent to the virtual K circle, which is concentric with the vessel body (10) and has a radius of 30% to 70% of the radius of the vessel body (10).

3. The paddle-type chemical reactor according to claim 2, characterized in that: A protruding guide section (19) is provided at the front end of the front section (16) near the inner wall of the vessel body (10), and the guide section (19) has the same curvature as the outer wall of the composite sleeve (14).

4. The paddle-type chemical reactor according to claim 3, characterized in that: The inner wall of the middle section (17) is provided with inwardly protruding pressure fins (22) at intervals, and a narrow opening is formed between the pressure fins (22). The liquid suction groove (21) is located on the rear side of the pressure fins (22).

5. The paddle-type chemical reactor according to claim 4, characterized in that: The liquid suction groove (21) is a groove that extends obliquely into the middle section (17).

6. The paddle-type chemical reactor according to claim 5, characterized in that: The stirring part (12) is also fixedly provided with a stirring paddle (23) at its end. The stirring paddle (23) is provided with at least two pieces symmetrically. After the stirring part (12) is driven by the driving part (11) to rotate, the stirring paddle (23) stirs.

7. The paddle-type chemical reactor according to claim 6, characterized in that: The composite paddle (14) is fixedly provided with a fixing sleeve (15), and is fixed to the stirring bracket (13) by the fixing sleeve (15) and bolts. The stirring bracket (13) is fitted and fixed on the stirring part (12).

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