CN217189504U - High-viscosity material stirring device and reaction kettle comprising same - Google Patents
High-viscosity material stirring device and reaction kettle comprising same Download PDFInfo
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- CN217189504U CN217189504U CN202121547005.8U CN202121547005U CN217189504U CN 217189504 U CN217189504 U CN 217189504U CN 202121547005 U CN202121547005 U CN 202121547005U CN 217189504 U CN217189504 U CN 217189504U
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Abstract
The invention discloses a high-viscosity material stirring device and a reaction kettle comprising the same, wherein the stirring device comprises a stirring shaft, and a first stirring paddle, a second stirring paddle and a third stirring paddle which are sequentially arranged on the stirring shaft from top to bottom; the first stirring paddle and the second stirring paddle are axial flow stirring paddles, and the third stirring paddle is a radial flow stirring paddle; the radian of a bottom paddle of the third stirring paddle is the same as that of a kettle bottom end socket of the reaction kettle; the distance between the bottom paddle of the third stirring paddle and the kettle bottom of the reaction kettle is not more than 15 cm; the distance between the side blade of the third stirring paddle and the kettle wall of the reaction kettle is not more than 15 cm. The stirring device adopts the combination of the axial flow stirring paddle and the radial flow stirring paddle, can form complete circulating flow, and can fully stir materials with high viscosity; when in use, no material accumulation occurs, and dead angles in the kettle can be reduced to the maximum extent.
Description
Technical Field
The invention relates to a high-viscosity material stirring device and a reaction kettle containing the same.
Background
The reaction kettle is a common device for chemical production, and the stirring device of the reaction kettle can mutually disperse two or more different materials in each other, thereby achieving the effect of uniform mixing and accelerating the heat transfer and mass transfer processes. In the actual production process, the mixing of high-viscosity substances or high-low viscosity substances is always difficult. The conventional solution at the present stage is to adopt a spiral belt or frame type stirring structure to stir the materials so as to accelerate the material transfer and the reaction process. However, the shear strength of a single helical ribbon stirrer structure is not high, so that the back mixing capability is insufficient, deep stirring is difficult to carry out, and the reaction time is long. The radial shearing action of frame agitator structure is great, but axial mixing capacity is not enough, and in order to avoid the internal effective volume of cauldron to reduce, the bottom in the cauldron is generally designed, leads to the cauldron in the upper and middle portion material to mix inadequately.
To above-mentioned problem, CN204503067U discloses a reation kettle agitating unit suitable for high consistency material, and this agitating unit is tertiary stirring rake, includes fan-shaped stirring vane, thick liquid formula stirring vane and frame stirring vane simultaneously, can intensive mixing to the material of high consistency, the material of being convenient for mixes between. However, the stirring paddle has a complex structure and a large difficulty in manufacturing process; and the lower slide plate is arranged on the wall of the kettle, so that the extrusion stirring effect of the upper part and the lower part in the kettle body can be improved, dead corners are easy to cause, and the kettle is difficult to clean. CN206519150U discloses an automatic control reaction kettle system suitable for a high-viscosity reaction system, wherein the stirring paddle is a stirring paddle combining an outer double-screw belt, an inner screw belt and an anchor type, and can be used for uniformly stirring high-viscosity materials. However, the spiral ribbon paddle is only suitable for a reaction kettle made of metal materials, is not suitable for a reaction kettle made of glass lining materials, and cannot be used for the reaction kettle made of glass lining materials; and the paddle occupation space is great in the cauldron, leads to sensors such as thermometer, viscometer can only install the breach at the low head, can increase the leakage risk of material and jacket heat transfer medium in the cauldron. CN206853673U discloses a vertical reaction kettle for high viscosity materials, in which the stirring paddle is provided with a stirring blade, and the blade is vertically provided with a tetrafluoro edge scraping sheet, which can reduce the dead angle and friction of stirring, but tetrafluoro cannot be used at high temperature for a long time, and limits the application range. CN203389553U discloses a coaxial double-shaft double-acting stirring device, which comprises a frame type stirrer and an axial flow type stirrer which are coaxially arranged up and down, and is suitable for high-viscosity material systems or material systems with wide viscosity range change in the process operation process. However, the stirring device occupies a large space in the kettle, and sensors such as a thermometer, a viscometer and the like cannot be arranged on the kettle cover of the reaction kettle; and in order to reach the effect of coaxial biax double acting, the hollow shaft that frame stirring rake adopted carries out the transmission, when frame rake is used for the stirring of high viscous substance, can produce very big moment of torsion to the central shaft, and the hollow shaft is very easily taken place to warp after a period of time, off-centre, can touch the cauldron wall even, causes the damage to the cauldron body and motor, has great potential safety hazard.
In conclusion, it is of great importance to develop a stirring device which is suitable for high-viscosity materials, has a simple and compact structure, is free from dead angle during stirring, is convenient to clean, is safe to use and is convenient to manufacture.
Disclosure of Invention
The invention provides a high-viscosity material stirring device and a reaction kettle comprising the same, aiming at overcoming the defects that the stirring device in the prior art cannot fully mix high-viscosity materials, has a limited application range, a complex manufacturing process, is not beneficial to space utilization of the reaction kettle and the like. The stirring device is suitable for high-viscosity materials, and has the advantages of simple and compact structure, convenient manufacture, convenient cleaning and high safety; when the mixer is used, no dead angle exists in stirring, and the high-viscosity materials can be fully mixed.
The invention solves the technical problems through the following technical scheme:
the invention provides a high-viscosity material stirring device which comprises a stirring shaft, and a first stirring paddle, a second stirring paddle and a third stirring paddle which are sequentially arranged on the stirring shaft from top to bottom;
the first stirring paddle and the second stirring paddle are axial flow stirring paddles, and the third stirring paddle is a radial flow stirring paddle;
the radian of a bottom paddle of the third stirring paddle is the same as that of a kettle bottom end socket of the reaction kettle;
the distance between the bottom paddle of the third stirring paddle and the kettle bottom of the reaction kettle is not more than 15 cm;
and the distance between the side blade of the third stirring paddle and the kettle wall of the reaction kettle is not more than 15 cm.
In the invention, preferably, the distance between the bottom blade of the third stirring paddle and the bottom of the reaction kettle is not more than 8 cm.
Preferably, the distance between a bottom paddle of the third stirring paddle and the bottom of the reaction kettle is 5-8 cm.
In the invention, preferably, the distance between the side blade of the third stirring paddle and the kettle wall of the reaction kettle is not more than 6 cm.
Preferably, the distance between the side blade of the third stirring paddle and the kettle wall of the reaction kettle is 5-6 cm.
In the invention, when the gap is kept between the third stirring paddle and the reaction kettle, the mixing effect of high-viscosity materials can be further improved, and the influence of the vibration of the paddle on the reaction kettle during stirring is relieved.
The arrangement mode of the invention ensures that the radial flow stirring paddle provides power for radial flow, and the axial flow stirring paddle provides power for axial flow, so that materials in the reaction kettle form complete circulating flow.
In the invention, preferably, the first stirring paddle is arranged at the position which is 0-1/2 away from the top end of the stirring shaft by the length of the stirring shaft; the second stirring paddle is arranged at the position which is 0-1/2 of the length of the stirring shaft away from the tail end of the stirring shaft; the third stirring paddle is arranged at the tail end of the stirring shaft.
Preferably, the first stirring paddle is arranged at a length of the stirring shaft from the top end 1/2 of the stirring shaft; the second stirring paddle is arranged at a distance from the end 1/6 of the stirring shaft in the length direction.
A person skilled in the art can adjust the positions of the first stirring paddle and the second stirring paddle up and down according to actual conditions, so that the first stirring paddle can contact materials when full-load production is carried out; and when the minimum load production is ensured, the second stirring paddle can contact the material.
In the present invention, the diameter of the first stirring paddle and the diameter of the second stirring paddle are preferably not less than 1/3, and more preferably not less than 1/2.
Preferably, the diameters of the first stirring paddle and the second stirring paddle are 1/3-1, more preferably 1/2-1 of the diameter of the third stirring paddle.
Through setting up stirring rake as big as possible, can further realize axial and radial intensive mixing to improve the mixed effect of high viscous material.
In the present invention, the first stirring blade and the second stirring blade may be axial flow type stirring blades which are conventional in the art. Preferably, the first stirring paddle and the second stirring paddle can be one of a paddle type paddle, a turbine type paddle or a propulsion type paddle; more preferably, the first stirring paddle and the second stirring paddle are paddle type paddles.
Preferably, the paddle comprises at least 3 or more blades.
As known to those skilled in the art, the included angle between adjacent blades can be set according to the number of the blades of the stirring paddle.
Preferably, the included angle between two adjacent paddles is the same.
The included angle formed by the length direction of the paddle and the axis of the stirring shaft in the vertical direction is respectively and independently 30-90 degrees, and preferably 30-60 degrees; more preferably 45.
Preferably, the included angle formed between the length direction of the paddle and the horizontal plane is 30-90 degrees, preferably 30-60 degrees; and more preferably 45. Because the paddle and the horizontal plane form a certain included angle, the materials can be ensured to be subjected to downward thrust.
In the present invention, the third stirring blade may be a radial flow type stirring blade which is conventional in the art.
Preferably, the third stirring paddle is an anchor type stirring paddle or a frame type stirring paddle; more preferably, the third stirring paddle is an anchor type stirring paddle.
In the present invention, the first stirring paddle, the second stirring paddle and the third stirring paddle may be made of materials that are conventional in the art.
One skilled in the art can select suitable materials according to the needs of the reaction system. Preferably, the material of the stirring shaft, the first stirring paddle, the second stirring paddle and the third stirring paddle can be one of carbon steel, stainless steel or glass lining respectively and independently.
In the present invention, preferably, the stirring shaft is a solid shaft. Even if the third stirring paddle is a radial-flow stirring paddle, when high-viscosity substances are stirred, the stirring shaft can generate a large torque, but the stirring shaft cannot be distorted, and the safety degree is high.
In the present invention, the size of the reactor can be determined by those skilled in the art according to the actual conditions, and in general, the stirring device can be applied to a reactor of 500L or more.
The invention also provides a reaction kettle for mixing the high-viscosity materials, which comprises a kettle body, a kettle cover buckled on the kettle body through a sealing buckle, and the stirring device; the kettle cover is provided with a through hole for allowing the stirring device to pass through and extend into the kettle body.
In the invention, preferably, the kettle cover is further provided with a feed port and a thermometer port.
In the invention, preferably, the bottom of the kettle body is also provided with a discharge hole.
In the invention, preferably, the reaction kettle further comprises a heating jacket sleeved on the outer surface of the kettle body. The heating jacket is used for controlling the temperature of the kettle body through a heating medium.
In the invention, the kettle body can be made of conventional materials in the field. Preferably, the kettle body is made of one of carbon steel, stainless steel or glass lining.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows:
(1) the stirring device adopts the combination of the axial flow stirring paddle and the radial flow stirring paddle, can form complete circulating flow, can fully stir materials with high viscosity and is convenient for the fusion of the materials; when in use, the kettle wall is smooth without a baffle, and material accumulation can not occur; and the radian of the stirring paddle is attached to the end socket of the reaction kettle, the clearance between the stirring paddle and the kettle wall and the kettle bottom is small, the dead angle in the kettle is reduced to the greatest extent, and the phenomenon of insufficient local reaction is avoided.
(2) The stirring device is easy to clean, simple in manufacturing process, suitable for any material, such as metal materials such as carbon steel and stainless steel or nonmetal materials such as glass lining, and capable of expanding the application range of the stirring device.
Drawings
FIG. 1 is a schematic structural view of a stirring apparatus and a reaction vessel in example 1 of the present invention;
reference numerals are as follows:
1-a stirring shaft; 2-a first stirring paddle; 3-a second stirring paddle; 4-a third stirring paddle; 5-a reaction kettle; 6-stirring a motor; 7-a feeding port; 8-thermometer port; 9-discharge port.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the invention thereto. Experimental procedures without specifying specific conditions in the following examples were selected in accordance with conventional procedures and conditions, or in accordance with commercial instructions.
Example 1
This embodiment 1 provides a stirring apparatus, and the structure of the stirring apparatus is shown in fig. 1.
The stirring device comprises a stirring shaft 1, a first stirring paddle 2, a second stirring paddle 3 and a third stirring paddle 4. The first stirring paddle 2 is arranged at the position which is far from the top end 1/2 of the stirring shaft 1 by the length of the stirring shaft; the second stirring paddle 3 is arranged at the position which is far from the end 1/6 of the stirring shaft 1 by the length of the stirring shaft; the third stirring paddle 4 is arranged at the tail end of the stirring shaft 1.
The first stirring paddle 2 and the second stirring paddle 3 are paddle type paddles and are composed of 3 fan-shaped paddles which are uniformly distributed, and the included angle between every two adjacent fan-shaped paddles is 120 degrees; the included angle formed by the length direction of each fan-shaped blade and the axis of the stirring shaft 1 in the vertical direction is 45 degrees, and the included angle formed by each fan-shaped blade and the horizontal plane is 45 degrees and faces downwards. The third stirring paddle 4 is an anchor type stirring paddle, and the radian of a paddle at the bottom of the anchor type stirring paddle is the same as that of a kettle bottom end socket of the reaction kettle 5; visually, the second stirring paddle 3 is embedded in the third stirring paddle 4 (in the frame of the anchor type stirring paddle), the bottom paddle of the anchor type stirring paddle is 8cm away from the bottom of the reaction kettle 5, the side paddle of the anchor type stirring paddle is 6cm away from the kettle wall of the reaction kettle 5, and dead angles and gaps in the kettle can be reduced to the greatest extent. The diameter of the first stirring paddle 2 is the same as that of the second stirring paddle 3, and the diameter of the first stirring paddle 2 and the diameter of the second stirring paddle 3 are 1/2 of the diameter of the third stirring paddle 4.
The stirring shaft 1, the first stirring paddle 2, the second stirring paddle 3 and the third stirring paddle 4 are made of stainless steel or glass lining, and the stirring shaft 1 is a solid shaft.
Example 2
This example 2 provides a reaction vessel comprising the stirring apparatus as described in example 1, and the schematic structural diagram of the reaction vessel is shown in fig. 1.
This reation kettle 5 is 2000L's high viscosity material reation kettle 5. The reaction kettle 5 comprises a kettle body, a kettle cover buckled on the kettle body through a sealing buckle, and a stirring device as shown in the embodiment 1. The kettle cover is provided with a through hole for enabling the stirring motor 6 to be arranged on the kettle cover through the stirring device, the stirring motor is connected to the stirring shaft 1, and the stirring shaft 1 and the stirring paddle stretch into the kettle body. A feeding port 7 is arranged on one side of the kettle cover, and a thermometer port 8 is arranged on the other side of the kettle cover; the bottom of the kettle body is provided with a discharge hole 9, and the outside of the kettle body is also sleeved with a heating jacket for controlling the temperature of the reaction kettle 5. The material of the reactor body of the reaction kettle 5 is stainless steel or glass lining.
Example 3
On the basis of example 2, the distance from the third stirring paddle 4 to the bottom of the reaction vessel 5 was changed and set to 15 cm.
Example 4
On the basis of the embodiment 2, only the included angles formed by the length directions of the blades of the first stirring paddle 2 and the second stirring paddle 3 and the vertical axis of the stirring shaft 1 are changed and are set to be 90 degrees.
Example 5
On the basis of the embodiment 2, the distance from the third stirring paddle 4 to the bottom of the reaction kettle 5 and the included angles formed by the length directions of the blades of the first stirring paddle 2 and the second stirring paddle 3 and the axis of the stirring shaft 1 in the vertical direction are changed and are respectively set to be 15cm and 90 degrees.
Comparative example 1
On the basis of example 2, the distance from the third stirring paddle 4 to the bottom of the reaction vessel 5 was changed and set to 20 cm.
Comparative example 2
On the basis of the embodiment 2, the distance from the third stirring paddle 4 to the bottom of the reaction kettle 5 and the included angles formed by the length directions of the blades of the first stirring paddle 2 and the second stirring paddle 3 and the axis of the vertical direction of the stirring shaft 1 are changed at the same time and are respectively set to be 20cm and 90 degrees.
Effect examples 2 to 5 and comparative examples 1 to 2
In order to verify the influence of the stirring device of the present invention on the degree of mixing of highly viscous materials, the following method was used to verify the effect:
1000L of high-viscosity material A is put into a 2000L reaction kettle, wherein the material A is a polymer containing NCO groups, and the viscosity of the material A is 50000 mpa.s; then 600L of material B with a viscosity of 2000mpa.s was added.
In general, the reaction of the materials A and B in the tank is carried out sufficiently with stirring in a short time, and the longer the reaction time is, the more the product quality is adversely affected. When a conventional stirring device provided with 1 stirring paddle is used for the reaction of the material A and the material B, the reaction time is more than 20 hours, and the reaction of the material A and the material B is still incomplete.
The effect detection method comprises the following steps: in order to test the effect of the stirring device on the reaction, the reaction of the materials in the reactor was monitored by sampling from the bottom of the reactor to measure the NCO content until the NCO content of the materials was reduced to 0, indicating that the two materials reacted completely.
The invention particularly selects the included angle formed by the length direction of the blades of the first stirring paddle and the second stirring paddle and the axis of the vertical direction of the stirring shaft and the distance from the third stirring paddle to the bottom of the kettle, which have important influence on the mixing degree of high-viscosity materials, and the mixing experiment results of the examples 2-5 and the comparative examples 1-2 are shown in table 1.
TABLE 1
As can be seen from the data in Table 1, when the distance from the third stirring paddle to the bottom of the kettle is not more than 15cm, and the included angles formed between the length directions of the blades of the first stirring paddle and the second stirring paddle and the axis of the stirring shaft in the vertical direction are 45 degrees, the reaction time can be controlled within 8 hours and is far shorter than that of the conventional stirring device.
As can be seen from comparative examples 1-2, if the distance from the third stirring paddle to the bottom of the kettle is increased to 20cm, the reaction time is still over 12h without changing the included angle formed by the length direction of the blades of the first stirring paddle and the second stirring paddle and the axis of the vertical direction of the stirring shaft.
If the included angle formed by the length direction of the blades of the first stirring paddle and the second stirring paddle and the axis of the stirring shaft in the vertical direction is 90 degrees, the reaction time is correspondingly prolonged.
Claims (9)
1. A high-viscosity material stirring device is characterized by comprising a stirring shaft, and a first stirring paddle, a second stirring paddle and a third stirring paddle which are sequentially arranged on the stirring shaft from top to bottom;
the first stirring paddle and the second stirring paddle are paddle type paddles, and the third stirring paddle is a radial flow stirring paddle;
the radian of a bottom paddle of the third stirring paddle is the same as that of a kettle bottom end socket of the reaction kettle;
the distance between the bottom paddle of the third stirring paddle and the kettle bottom of the reaction kettle is 5-8 cm;
the distance between the side blade of the third stirring paddle and the kettle wall of the reaction kettle is not more than 15 cm;
the first stirring paddle is arranged at the position which is far from the top end 1/2 of the stirring shaft by the length of the stirring shaft; the second stirring paddle is arranged at the position which is far from the end 1/6 of the stirring shaft by the length of the stirring shaft;
the paddle type paddle comprises at least more than 3 paddles;
the included angle formed by the length direction of the blades and the axis of the stirring shaft in the vertical direction is 30-60 degrees respectively and independently.
2. The high-viscosity material stirring device according to claim 1, wherein the high-viscosity material stirring device satisfies one or more of the following conditions:
the distance between a side blade of the third stirring paddle and the kettle wall of the reaction kettle is not more than 6 cm;
the third stirring paddle is arranged at the tail end of the stirring shaft;
1/3 the diameter of the first stirring paddle and the second stirring paddle is not less than the diameter of the third stirring paddle;
the third stirring paddle is an anchor type stirring paddle or a frame type stirring paddle;
the stirring shaft is a solid shaft.
3. The high-viscosity material stirring device according to claim 2, wherein the high-viscosity material stirring device satisfies one or more of the following conditions:
the distance between a side blade of the third stirring paddle and the kettle wall of the reaction kettle is 5-6 cm;
the diameter of the first stirring paddle and the diameter of the second stirring paddle are not less than 1/2 of the diameter of the third stirring paddle;
the third stirring paddle is an anchor type stirring paddle.
4. The high-viscosity material stirring device according to claim 2, wherein the diameters of the first stirring paddle and the second stirring paddle are 1/3-1 of the diameter of the third stirring paddle.
5. The high-viscosity material stirring device according to claim 4, wherein the high-viscosity material stirring device satisfies one or more of the following conditions:
the diameter of the first stirring paddle and the diameter of the second stirring paddle are 1/2-1 of the diameter of the third stirring paddle;
the included angles between two adjacent paddles are the same;
the included angles formed by the length direction of the blades and the horizontal plane are respectively and independently 30-90 degrees.
6. The high-viscosity material stirring device according to claim 5, wherein the high-viscosity material stirring device satisfies one or more of the following conditions:
the included angles formed by the length directions of the blades and the horizontal plane are respectively and independently 30-60 degrees.
7. The high viscosity material stirring device according to claim 6, wherein the high viscosity material stirring device satisfies one or more of the following conditions:
the included angle formed by the length direction of the paddle and the axis of the stirring shaft in the vertical direction is 45 degrees;
the included angle formed by the length direction of the paddle and the horizontal plane is 45 degrees.
8. A reaction kettle for mixing high-viscosity materials is characterized by comprising a kettle body, a kettle cover buckled on the kettle body through a sealing buckle, and a stirring device as claimed in any one of claims 1 to 7; the kettle cover is provided with a through hole for leading the stirring device to extend into the kettle body.
9. The reactor for mixing high-viscosity materials according to claim 8, wherein the reactor for mixing high-viscosity materials satisfies one or more of the following conditions:
the kettle cover is also provided with a feed inlet and a thermometer port;
the bottom of the kettle body is also provided with a discharge hole;
the reaction kettle further comprises a heating jacket sleeved on the outer surface of the kettle body.
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| CN202121547005.8U CN217189504U (en) | 2021-07-08 | 2021-07-08 | High-viscosity material stirring device and reaction kettle comprising same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115301186A (en) * | 2022-08-17 | 2022-11-08 | 天津全和诚科技有限责任公司 | Preparation reation kettle of mobile phase for preparation separation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115301186A (en) * | 2022-08-17 | 2022-11-08 | 天津全和诚科技有限责任公司 | Preparation reation kettle of mobile phase for preparation separation |
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