CN216440602U - A kind of stirrer applied to tank reactor - Google Patents

Abstract

The utility model relates to a stirrer applied to a kettle-type reactor, comprising a transmission rod and three layers of stirring layers unevenly arranged on the transmission rod. It has a horizontal angle and is in different longitudinal positions; the stirring paddle blades are asymmetrical elliptical annular structures, the torus is perpendicular to the horizontal plane, and is laterally arranged along the long axis direction, and each layer of stirring paddle blades and transmission rods have different clips. horn. The three-layer stirring paddle blade provides upward force and downward pressure on the material, forming different flow layers and stirring, which improves the stirring efficiency and space utilization rate, greatly reduces the phenomenon of material deposition and fusion, and reduces the accumulation of materials at the bottom of the reactor. The efficiency of the prepared target product is improved, the conversion rate of the material is improved, the waste of the material is avoided, and the structure of the tank reactor is simplified to a certain extent.

Description

A kind of stirrer applied to tank reactor

technical field

The utility model belongs to the technical field of mechanical equipment, and relates to a stirrer which is helpful for improving the stirring efficiency, improving the mixing uniformity of materials, shortening the mixing time of materials and increasing the reaction efficiency.

Background technique

The kettle reactor is a container with physical or chemical reaction. Through the structural design and parameter configuration of the container, the heating, evaporation, cooling and low-speed mixing functions required by the process are realized. It is widely used in petroleum, chemical industry, rubber, pesticide, dyestuff, medicine, food, and is used to complete the pressure vessel of vulcanization, nitration, hydrogenation, alkylation, polymerization, condensation and other processes.

The agitator is an important component of the tank reactor, and together with the sealing device, the reduction box, the stirring motor, the bracket, the baffle and the guide cylinder form a mechanical stirring device. The traditional agitator cannot stir the entire space of the reaction kettle. It drives the blade to stir the liquid through the rotation of the transmission rod, and then the solid in it is driven by the liquid to form a solid-liquid mixing. However, in the actual production process, because the traditional agitator adopts a single-layer stirring structure, there is only one stirring layer on the transmission rod. During the rotation of the stirring rod, it is easy to generate a vortex, so that the material rotates with the generation of the fluid vortex. It does not react and sinks due to the gravity of the material itself, forming a material layer at the bottom of the mixing drum. This part of the material cannot be suspended in the solvent, cannot enter the next process, and does not react, and affects the operating efficiency of the equipment. Increase The workload of cleaning the reactor makes the material conversion rate low and the yield decreased.

SUMMARY OF THE INVENTION

The purpose of the utility model is to overcome the deficiencies of the prior art and to design a stirrer which is helpful for improving the stirring efficiency.

A stirrer applied to a tank-type reactor, the stirrer adopts a three-layered circulating asymmetric annular stirring structure, comprising a transmission rod and three stirring layers unevenly arranged on the transmission rod, and each stirring layer contains a stirring layer. paddle blade.

The stirring paddle blade is an asymmetric elliptical-like annular structure, and is connected to the transmission rod;

Preferably, the elliptical-like torus of the stirring paddle blades are all rugby-shaped, but the shapes of the elliptical-like torus of each stirring paddle blade are not exactly the same; The stirring blade has a certain thickness, preferably 0.1-0.3 cm.

The annular surface of the elliptical-like ring of the stirring paddle blade is perpendicular to the horizontal plane, and is arranged laterally along the long axis direction; the three stirring paddle blades have a horizontal angle between them and are in different longitudinal positions. Preferably, the horizontal angle between two adjacent stirring paddle blades is 120°, and the vertical interval between two adjacent stirring layers is greater than the short axis of the elliptical-like ring and smaller than the long axis of the elliptical-like ring.

Each layer of stirring paddle blades has a different angle with the transmission rod; preferably, the stirring paddle blades in the three layers of stirring layers are inclined downward. From bottom to top, the inclination of the stirring paddle blades gradually decreases, and the second layer stirs The angle between the long axis of the paddle blade and the transmission rod is greater than the angle between the long axis of the first layer of stirring blade and the transmission rod, and the angle between the long axis of the third layer of stirring blade and the transmission rod is greater than The angle between the long axis of the second-layer stirring blade and the transmission rod.

Specifically, the angle between the long axis of the first layer of stirring paddle blades and the transmission rod is 33° to 37°; the included angle between the long axis of the second layer of stirring paddle blades and the transmission rod is 45° to 49° ; The angle between the long axis of the third-layer stirring paddle blade and the transmission rod is 55° to 60°.

Preferably, the stirring blade is welded tangentially to the wall of the transmission rod, or the stirring blade and the transmission rod are integrally formed; preferably, the intersection of the long axis of the stirring blade and the transmission rod is 1/4 of the length of the long axis of the stirring blade ~1/3 place.

The kettle type reactor described in the utility model is preferably a kettle type reactor for preparing uniform mesocarbon microspheres by thermal polycondensation.

In the present invention, the stirring paddle itself does not have a conventional symmetrical structure, but an asymmetric elliptical annular structure, and each layer of stirring paddle blades has a specific structure and installation form, forming a three-layer circular asymmetric annular stirring structure. The stirring blade and the transmission shaft are not vertically arranged, but inclined downward and the three layers have different degrees of inclination. In the stirring area, the entire reactor is divided into six stirring areas from bottom to top. Taking the transmission rod as the longitudinal reference, two flow layers with different sizes and different stirring directions are formed in the adjacent two stirring areas; With a certain cross-sectional radius of the ring body, two flow layers with different sizes and different horizontal stirring directions are formed in the ring body and the inner cavity of the ring; The directions respectively form six flow layers with different sizes and different stirring directions. With the rotation of the stirring paddle blades driven by the drive shaft, each flow layer is circulating with at least two flow layers, and the fluid itself is also generating eddy currents to perform agitation between the flow layers, which makes the stirring more uniform; During the reaction process, the three-layer stirring blade provides upward force and downward pressure to the solid microspheres, forming different flow layers and stirring, which improves the stirring efficiency and space utilization rate, and greatly reduces the deposition and melting of solid microspheres in the material. And the phenomenon of uneven particle size, reduce material waste, improve reaction preparation efficiency and conversion rate of reaction materials.

The agitator designed in the utility model can simplify the existing tank-type reactor at the same time. In order to improve the stirring efficiency and reduce the existence of eddy current in the existing tank-type reactor, a baffle plate and a guide cylinder should be provided. In order to cancel the "swirling", the function of the guide cylinder improves the mixing degree, and the six flow layers generated by the agitator in the present utility model fundamentally avoid the generation of eddy currents, and at the same time the blades are hollow. The circulating flow also promotes the improvement of the mixing degree of the material in the solvent, and has the functions of the baffle and the guide tube, which can simplify the tank reactor.

Compared with the prior art, the beneficial effects of the present utility model are:

The utility model designs a stirrer which adopts a three-layer circulation asymmetric annular stirring structure. During the reaction process of the kettle type, the three-layer stirring paddle blade provides the upward force and the downward pressure to the material dissolved in the solvent to form different flows. Layer and stirring, which improves the stirring efficiency and space utilization rate, greatly reduces the phenomenon of material deposition and fusion, reduces the accumulation of materials at the bottom of the reactor, improves the efficiency of the target product prepared, and improves the conversion rate of materials at the same time. It also simplifies the structure of the tank reactor to a certain extent.

Description of drawings

(1) Fig. 1 is the structural representation of the agitator of the utility model;

(2) Fig. 2 is the top view of the agitator described in the utility model;

(3) FIG. 3 is a schematic structural diagram of three stirring paddle blades of the agitator of the present invention.

In the figure, 1 is the transmission rod, 2 is the stirring blade, a, b, and c are the intersections of the long axis of the stirring blade and the transmission rod, r is the elliptical ring-like ring section radius of the stirring blade, and d is the stirring blade The thickness of the paddle blade, L ₁ , L ₂ , and L ₃ are the long axes of the three-layer stirring paddle blades, respectively, α, β, and γ are the angles between the long axis of the three-layer stirring paddle blades and the transmission rod, Z ₁ -Z ₆ and W ₁ -W ₆ are the different areas formed by the blades of the stirring paddle.

Detailed ways

The present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments:

As shown in Figure 1 is a schematic structural diagram of the agitator of the present utility model; the agitator adopts a three-layer circular asymmetrical stirring structure, including a transmission rod 1 and three layers of stirring layers unevenly arranged on the transmission rod, each The layer stirring layer contains a stirring paddle blade 2;

The stirring paddle blade 2 is an asymmetrical elliptical annular structure, connected to the transmission rod 1, tangentially welded or integrally formed with the transmission rod 1, and the intersection point a (b) of the long axis L of the stirring paddle blade 2 and the transmission rod 1. /c) at 1/4 to 1/3 of the length of the long axis of the impeller blade;

The elliptical-like torus of the stirring paddle blades 2 are all rugby-shaped, but the shapes of the elliptical-like torus of each stirring paddle blade are not exactly the same; The thickness d of the stirring paddle blade 2 is 0.1-0.3 cm;

The annular surface of the elliptical ring of the stirring paddle blade 2 is perpendicular to the horizontal plane, and is arranged laterally along the long axis direction; there is a horizontal angle between the three stirring paddle blades, and they are in different longitudinal positions; The horizontal angle between them is 120°, and the vertical interval between two adjacent stirring layers is greater than the short axis of the elliptical-like ring and less than the long axis of the elliptical-like ring;

Each layer of stirring paddle blades has a different angle with the transmission rod; the stirring paddle blades in the three layers of stirring layers are inclined downward. From bottom to top, the inclination of the stirring paddle blades gradually decreases. Specifically, the first layer of stirring The angle between the long axis L1 of the paddle blade and the transmission rod 1 is 33° to 37°; the angle between the long axis L2 of the second layer of stirring blade and the transmission rod 1 is 45° to 49°; the third The included angle between the long axis L3 of the layer stirring paddle blade and the transmission rod 1 is 55°˜60°.

It can be seen in detail from FIG. 3 that the stirring blade itself does not have a common blade structure, but an asymmetric elliptical-like annular structure with different angles from the transmission rod. From bottom to top, the angle α between the long axis L ₁ of the first layer of stirring paddle blades and the transmission rod 1 is 33° to 37°, so that the horizontal plane where the long axis of the stirring paddle blade and the transmission rod connection point a is located is The horizontal reference forms the upper and lower regions Z ₁ and Z ₂ to ensure that two flow layers with different sizes and different stirring directions are formed in these two regions. The cavity forms two flow layers W1 and W2 with different sizes and different horizontal stirring directions; in addition, the blades will stir between the flow layers. The angle β between the long axis L ₂ of the second layer of stirring blades and the transmission rod is 45° to 49°, and the included angle γ between the long axis L ₃ of the third layer of stirring blades and the transmission rod is 55° ～60°, the same principle, in the horizontal and vertical directions, six flow layers with different directions and sizes are formed, and three asymmetrical elliptical annular structure blades keep stirring between the flow layers. The angle of each flow layer is different, and each flow layer is circulating with at least two flow layers, so as to ensure that when there is blade stirring, the fluid itself is also generating eddy current to stir between the flow layers, which makes the stirring more uniform and makes the material more uniform. The distribution is more uniform during the reaction.

In a practically applied reaction kettle, the working position of the agitator of the present invention is similar to that of a common stirring rod. The agitator of the utility model stirs the material and the solvent during the operation of the reaction kettle, and uses the designed specific structure to generate six mutually intersecting flow layers when the solid-liquid mixing is stirred, and convection is carried out in various flow layers. At the same time of stirring (mixed flow at this time), and because the stirring blade also has a thickness, it regularly circulates and stirs each space area, which ensures the uniformity of solid and liquid in the whole space, and the stirring is more uniform, which provides powerful environmental conditions for the reaction.

Example 1:

In the tank reactor for preparing uniform mesophase carbon microspheres by direct thermal polycondensation, the stirrer of the above scheme is used;

Preparation of carbon microspheres by direct thermal polycondensation method: Weigh a certain amount of raw oil and carbon black (5%) in a certain mass proportion and mix them uniformly, ultrasonically disperse for 1 hour, and then pour the mixture into the above-mentioned kettle reactor and replace nitrogen three times Then, the pressure in the kettle was charged to 3MPa; the heating voltage was set to 150V, the rotational speed of the stirrer was adjusted to 400r/min, and the temperature was raised to a certain temperature (430°C) at 5°C/min for a certain time (8h), during the reaction process. The pressure in the kettle was maintained at 3MPa by adjusting the air release valve; after the reaction, the heating power was turned off, and stirring was stopped. After the reaction kettle was cooled to room temperature, a uniformly distributed reaction product was obtained. The particle size distribution was centered at 10-20 microns and the yield was 47-49%.

Claims (7)

1. an agitator that is applied to tank reactor, it is characterized in that, described agitator adopts three-layer circulation asymmetric annular stirring structure, comprises transmission rod and the three-layer stirring layer that is unevenly arranged on transmission rod, each The layer stirring layer contains a stirring paddle blade, and the three stirring paddle blades have a horizontal angle between them and are in different longitudinal positions; The stirring paddle blade is an asymmetric elliptical-like annular structure, and is connected to the transmission rod; The ellipse-like annular ring surface of the stirring paddle blade is perpendicular to the horizontal plane, and is arranged laterally along the long axis direction, and each layer of stirring paddle blades and the transmission rod have different included angles. 2. a kind of stirrer that is applied to tank reactor according to claim 1 is characterized in that, the stirring paddle blade in the three-layer stirring layer is all inclined downward, and from bottom to top, the degree of inclination of the stirring paddle blade Gradually decrease, the angle between the long axis of the second layer of stirring paddle blades and the transmission rod is greater than the angle between the long axis of the first layer of stirring paddle blades and the transmission rod, and the long axis of the third layer of stirring paddle blades and the transmission rod. The included angle between the transmission rods is greater than the included angle between the long axis of the second layer of stirring paddle blades and the transmission rod. 3. a kind of stirrer applied to tank reactor according to claim 2 is characterized in that, the included angle between the long axis of the first layer of stirring paddle blades and the transmission rod is 33°～37°; The included angle between the long axis of the second-layer stirring paddle blade and the transmission rod is 45°-49°; the included angle between the long axis of the third-layer stirring paddle blade and the transmission rod is 55°-60°. 4. a kind of stirrer that is applied to tank reactor according to claim 1, is characterized in that, the class elliptical torus of described stirring paddle blade is rugby ball but the class elliptical torus of each stirring paddle blade The shapes of the ellipsoid-like rings are not exactly the same, the radius of the ring body section of the elliptical ring is 0.5-1.5 cm, and the stirring blade has a thickness of 0.1-0.3 cm. 5. a kind of stirrer that is applied to tank reactor according to claim 1 is characterized in that, the horizontal angle between two adjacent stirring paddle blades is 120 °, and the vertical angle of two adjacent stirring layers is 120°. The interval is greater than the minor axis of the elliptical-like ring is smaller than the major axis of the elliptical-like ring. 6. a kind of stirrer applied to kettle type reactor according to claim 1, is characterized in that, described stirring paddle blade is tangentially welded on the transmission rod wall, or the stirring paddle blade and the transmission rod are integrally formed; The intersection point of the long axis of the stirring paddle blade and the transmission rod is at 1/4 to 1/3 of the length of the long axis of the stirring paddle blade. 7. a kind of stirrer that is applied to tank reactor according to any one of claim 1-6, it is characterized in that, described tank reactor is the tank reaction that thermal polycondensation method prepares uniform mesophase carbon microspheres device.

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