CN110694575A

CN110694575A - Fin, stirring shaft and tubular reactor

Info

Publication number: CN110694575A
Application number: CN201911094943.4A
Authority: CN
Inventors: 安兰翔; 赵平; 韩永强; 唐立星
Original assignee: Himile Mechanical Manufacturing Co Ltd
Current assignee: Himile Mechanical Manufacturing Co Ltd
Priority date: 2019-11-11
Filing date: 2019-11-11
Publication date: 2020-01-17

Abstract

A fin comprises a T-shaped fin body with a liquid facing surface and a liquid backing surface, wherein the T-shaped fin body comprises a root and an end part, and the end part comprises an expansion part which expands from the connection part of the end part and the root to two sides. The fin can fully refine materials during stirring and can strengthen the mixing effect. Also provides a stirring shaft with the fin and a tubular reactor with the stirring shaft.

Description

Fin, stirring shaft and tubular reactor

Technical Field

The invention relates to the field of chemical equipment, in particular to a fin, a stirring shaft and a tubular reactor.

Background

Some existing chemical reactions are carried out in a reaction kettle, and need to undergo filling, reaction and discharging, and the crystals are adhered to the wall in the process, and need to be manually cleaned or soaked in a solvent, so that the time and the labor are wasted; meanwhile, the mixing action of the axe type reaction stirring shaft is weaker, the heat exchange effect of the reaction kettle is poor, and the purity of the reaction product is insufficient; most of the existing tubular reactors also have the problem of wall adhesion due to crystallization of the tubular wall, which affects the normal reaction production.

Disclosure of Invention

In order to solve one or more of the technical problems, the invention provides a fin, a stirring shaft and a tubular reactor.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a fin comprises a T-shaped fin body with a liquid facing surface and a liquid backing surface, wherein the T-shaped fin body comprises a root and an end part, and the end part comprises an expansion part which expands from the connection part of the end part and the root to two sides.

Further, the expansion part comprises a first side edge and a second side edge, and the first side edge and the second side edge form an included angle alpha; preferably, the angle is preferably 75-85 °, and most preferably about 80 °.

Further, the tip still includes with the front end portion that the expansion portion is connected, the front end portion includes third side and fourth side, third side and fourth side are respectively from first side and second side edge vertical direction extends.

Further, a backward inclination angle beta is formed from the middle to two ends of the liquid level; preferably, the rearward inclination is 167-.

Further, the liquid level comprises a first liquid level and a second liquid level, and the first liquid level and the second liquid level form the backward inclination angle; preferably, the liquid level further comprises a third liquid level, and the first liquid level is connected with the second liquid level through the third liquid level.

Further, the thickness of the fin body gradually increases from the end portion to the root portion, and the back liquid level forms a forward inclination angle γ from the end portion to the root portion; preferably, the anteversion angle is preferably 84-90 °, and most preferably about 87 °.

A stirring shaft comprises a shaft body and a plurality of the fins arranged on the outer peripheral surface of the shaft body.

Further, stirring rods are arranged between the adjacent fins;

and/or adjacent said fins have an axial overlap region;

and/or the fins are distributed uniformly in a staggered and alternate mode in the circumferential direction, preferably distributed in 3 directions at intervals of 120 degrees;

and/or the fins are arranged spirally in the circumferential direction;

and/or the shaft body comprises an inner shaft and an outer shaft, a medium cavity is formed between the inner shaft and the outer shaft, the inner shaft is of a hollow structure and is provided with a connecting port and a medium inlet, the connecting port is communicated with the cavity, and the cavity is communicated with a medium outlet; preferably, the shaft body includes an inner shaft interlayer and an outer shaft interlayer, the inner shaft interlayer and the outer shaft interlayer are fixedly arranged between the inner shaft and the outer shaft, a medium outflow channel is formed between the inner circumference of the inner shaft interlayer and the outer circumference of the inner shaft, the medium outflow channel is communicated with the cavity, and the medium outlet is arranged at one end of the inner shaft interlayer and is communicated with the medium outflow channel.

A tubular reactor is provided with the stirring shaft.

Further, the tubular reactor also comprises a reaction cavity, the reaction cavity comprises an outer jacket, the outer jacket comprises an inner layer and an outer layer, the inner layer and the outer layer form an annular channel, and the annular channel is used for circulation of a heat exchange medium;

and/or the tubular reactor further comprises a transmission device, wherein the transmission device is used for driving the stirring shaft to rotate, preferably, the transmission device comprises a motor, a first synchronous belt wheel connected with the motor, and a second synchronous belt wheel connected with the first synchronous belt wheel through a transmission belt, and the second synchronous belt wheel is connected with the stirring shaft;

and/or the stirring shaft is rotatably connected with the rotating joint, the dynamic seal is used for sealing the reaction cavity, the bearing chamber is arranged on the periphery of the stirring shaft, and preferably, the bearing chamber comprises a bearing gland, a bearing and static seals arranged on two sides of the bearing; optionally, the dynamic seal is a mechanical seal, a magnetic seal, a packing seal or a dynamic seal ring and/or the static seal is a lip seal, an O-ring, a gasket or a packing seal;

and/or the surface of the stirring shaft is subjected to spraying treatment, preferably PFA or PTFE;

and/or the distance between the fin and the inner wall of the reaction cavity of the tubular reactor is 1 mm;

and/or one axial end of the reactor is provided with a feed inlet, and a plurality of groups of feed inlets are distributed along two sides of the axial direction;

and/or the stirring shaft is supported on a flange at one end of the tubular reactor through a sliding sleeve, and preferably, an adjusting sealing ring is arranged between the sliding sleeve and the stirring shaft.

The beneficial effects of the invention include but are not limited to:

1. the fin can fully refine materials, has enough reinforced mixing effect, improves the product purity and indirectly improves the reaction efficiency.

2. The tubular reactor has good heat exchange performance, can quickly and timely take away reaction heat, avoids strong heat release and explosion, and particularly realizes double heat exchange inside and outside;

3. the tubular reactor can realize continuous production and improve the efficiency;

4. the invention can well remove and inhibit the crystal from sticking to the wall, and avoids frequent shutdown and cleaning;

5. the single equipment capability of the invention can replace a plurality of kettle type equipment, thus saving resource space.

Drawings

FIG. 1 is a front view of a fin provided by the present invention;

FIG. 2 is a side view of a fin provided by the present invention;

FIG. 3 is a top view of a fin provided by the present invention;

FIG. 4 is a schematic view of a partial structure of a stirring shaft provided by the present invention;

FIG. 5 is a schematic view of the 3-direction distribution structure of the stirring shaft fin provided by the present invention;

FIG. 6 is a schematic view of the axial overlapping region of the stirring shaft provided by the present invention;

FIG. 7 is a schematic view of the overall structure of a stirring shaft provided by the present invention;

FIG. 8 is an enlarged view of portion A of FIG. 7;

FIG. 9 is an enlarged view of portion B of FIG. 7;

FIG. 10 is a schematic view of a tubular reactor configuration provided by the present invention;

FIG. 11 is a cross-sectional view of a tubular reactor provided by the present invention;

FIG. 12 is an enlarged view of portion C of FIG. 11;

FIG. 13 is an enlarged view of portion D of FIG. 11;

FIG. 14 is a schematic view of the outer jacket of a tubular reactor provided by the present invention;

FIG. 15 is another view of the overall structure of the tubular reactor provided by the present invention;

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

The embodiments of the present invention will be further explained with reference to the drawings.

As shown in fig. 1 to 3, a fin 100 comprises a T-shaped fin body with a liquid facing surface 110 and a liquid backing surface 109, the T-shaped fin body comprises a root 101 and an end 102, and the end 102 comprises an expansion part 103 expanding from the connection part of the end 102 and the root 101 to two sides. In the embodiment, the fins are designed into a T-like structure, the shearing area borne by the T-like liquid level from far to the center is enlarged due to expansion, materials can be fully refined during stirring, and the mixing effect can be enhanced.

In one embodiment, the fin body is designed to have equal strength, so that the fin is not damaged when rotating.

In one embodiment, the flared portion 103 includes a first side 104 and a second side 105, and the first side 104 and the second side 105 have an included angle α. The expansion part is gradually expanded outwards from two side edges to form an included angle, so that the shearing area borne by the liquid level from far to the center is ensured to be gradually (gradually) increased, and the full refining and reinforced mixing effect is ensured. In this embodiment, the angle is preferably 75-85 °, and most preferably about 80 °.

In the former embodiment, the first side 104 and the second side 105 are preferably symmetrically distributed.

In one embodiment, the end portion 102 further comprises a front end portion 106 connected to the flared portion 103, and the front end portion 106 comprises a third side 107 and a fourth side 108, and the third side 107 and the fourth side 108 extend in a vertical direction from the first side 104 and the second side 105, respectively.

In one embodiment, the liquid level 110 forms a backward inclination angle β from the middle to both ends, and preferably, the backward inclination angle is 167-. In this embodiment, the arrangement of the backward inclination angle β can ensure that the liquid is divided towards two sides when the liquid is exposed, so as to enhance the mixing effect.

In one embodiment, the liquid facing surface 110 includes a first liquid facing surface 111 and a second liquid facing surface 112, and the first liquid facing surface 111 and the second liquid facing surface 112 form the backward tilt angle.

In the previous exemplary embodiment, the first liquid level 111 and the second liquid level 112 are preferably distributed symmetrically.

In one embodiment, the liquid level 110 further includes a third liquid level 113, and the first liquid level 111 is connected to the second liquid level 112 through the third liquid level 113. Through the setting of the third liquid level, the smooth transition from the first liquid level to the second liquid level can be ensured.

In one embodiment, the thickness of the fin body gradually increases from the end 102 to the root 101, and the back liquid level 109 forms a forward rake angle γ from the end 102 to the root 101. In this embodiment, through the setting of anteversion angle, design into tip thin, root thick with the fin, can adapt to fin stirring in-process tip little by shearing force, the big operating mode of root atress. In this embodiment, the anteversion angle is preferably 84-90 °, and most preferably about 87 °.

As shown in fig. 4 to 9, the present invention also provides a stirring shaft comprising a shaft body 114 and a plurality of the aforementioned fins 100 arranged on the outer peripheral surface of the shaft body 114.

In one embodiment, stir bars 115 are provided between adjacent fins 100 to further enhance mixing.

In one embodiment, the fins 100 are uniformly distributed in the circumferential direction, preferably distributed in 3 directions (at intervals of 120 °), so as to alternately cover the whole stirring cavity in a staggered manner, thereby ensuring that the crystals on the inner wall of the stirring cavity are scraped. The circumferential interval of 120 degrees is distributed according to material properties such as actual reaction medium viscosity, the number reaches the best mixing, and different circumferential fins can be selected according to different material properties. Of course, the fins 100 may be arranged in other ways in the circumferential direction, such as spiral arrangement, etc., according to the material and the stirring condition.

In one embodiment, adjacent fins 100 have an axial overlap 116, which is provided to ensure full-area scraping of the inner wall of the stir chamber.

In one embodiment, when the material viscosity is low, the number of circumferential fins can be increased and/or the axial overlap length can be increased, and when the material viscosity is high, the number of circumferential fins can be decreased and/or the axial overlap length can be decreased to achieve cutting and mixing of the materials and avoid the formation of common tangential flow without relative velocity to produce cutting and mixing.

In one embodiment, the surface of the stirring shaft is subjected to spraying treatment, preferably PFA or PTFE is sprayed, so that the surface adhesion is reduced, and the stirring shaft is ensured to be sufficiently clean.

In one embodiment, the shaft body 114 includes an inner shaft 117 and an outer shaft 118, the inner shaft 117 and the outer shaft 118 form a medium (heat exchange medium) cavity therebetween, the inner shaft 117 is a hollow structure and has a connection port 119 and a medium inlet 120, the connection port 119 is communicated with the cavity, and the cavity is communicated with a medium outlet 122. In this embodiment, the heat exchange medium passes through the inner shaft from the medium inlet, enters the cavity (baffle portion) between the inner shaft and the outer shaft through the connecting port to exchange heat, and flows out of the cavity. Through set up heat transfer structure inside the (mixing) shaft, can in time take away the reaction heat fast.

In one embodiment, the shaft body 114 further includes an inner and outer shaft interlayer 121, the inner and outer shaft interlayer 121 is fixedly disposed between the inner shaft 117 and the outer shaft 118, an inner circumference of the inner and outer shaft interlayer 121 and an outer circumference of the inner shaft 117 form a medium outflow passage, the medium outflow passage is communicated with the cavity, and the medium outlet 122 is disposed at one end of the inner and outer shaft interlayer 121 and is communicated with the medium outflow passage.

In one embodiment, the fin 100 also includes a medium channel (not shown) therein, which is in communication with the cavity for substantially exchanging heat with the fluid.

In one embodiment, the end of the inner shaft 117 opposite the media inlet 120 is fixedly attached to the outer shaft 118 by a closed plug 123.

In one embodiment, the end of the inner shaft 117 opposite the media inlet 120 is open and the closing plug 123 is connected to the open end.

As shown in fig. 10 to 15, the present invention also provides a tubular reactor comprising the stirring shaft described above.

In one embodiment, the tubular reactor further comprises a reaction chamber 131, the reaction chamber 131 comprises an outer jacket 134 (shown in fig. 14), the outer jacket 134 comprises an inner layer and an outer layer, the inner layer and the outer layer form an annular channel, the annular channel is used for circulating a heat exchange medium, heat transfer of the reaction chamber is realized, double heat exchange can be realized together with the stirring shaft, and strong heat release and explosion are avoided.

In one embodiment, the pipe reactor comprises

flanges

132, 135 arranged at both ends of the reaction chamber 131.

In one embodiment, the connection between the

flanges

132, 135 and the reaction chamber 131 is provided with a sealing ring 133.

In one embodiment, the stirring shaft is supported by a sliding sleeve 137 to a flange 132 at one end of the reaction chamber 131 (as shown in fig. 12).

In one embodiment, an adjusting sealing ring 136 is disposed between the sliding sleeve 137 and the stirring shaft.

In one embodiment, the tubular reactor further comprises a transmission device for driving the stirring shaft to rotate.

In one embodiment, the transmission device comprises a motor 124, a first synchronous pulley 125 connected with the motor 124, and a second synchronous pulley 128 connected with the first synchronous pulley 125 through a transmission belt 126, wherein the second synchronous pulley 128 is connected with the stirring shaft.

In one embodiment, the stirring device further comprises a rotary joint 127, a bearing chamber 129 and a dynamic seal 130, wherein the rotary joint 127 is rotatably connected with the stirring shaft, the dynamic seal 130 is used for sealing the reaction cavity 131, and the bearing chamber 129 is arranged on the periphery of the stirring shaft. Preferably, the dynamic seal can be a mechanical seal, a magnetic seal, a packing seal or a dynamic seal ring, which can be applied to a dynamic seal structure of a rotary seal.

In the foregoing embodiment, the motor transmits rotation to the stirring shaft through the first synchronous pulley, the conveyor belt and the second synchronous pulley, the stirring shaft realizes stable rotation in the bearing chamber under the support of the flange, the mechanical seal realizes sealing of the cavity, the rotary joint completes heat exchange in the stirring shaft, and when the stirring shaft rotates, the fins realize axial shearing and radial shearing of media, so as to realize intensified mixing.

In one embodiment, the bearing chamber 129 includes a bearing gland 138, bearings 139, and static seals 140 disposed on either side of the bearings 139. Preferably, the static seal can be lip seal, O-ring, gasket, packing seal, or other static seal structure.

In one embodiment, a feed port is arranged at one axial end of the reactor, and a plurality of groups of feed ports are distributed along two sides of the axial direction (as shown in fig. 15), so that a person skilled in the art can select feed ports according to different working conditions and different processes to feed, and the entering materials are sheared, separated and refined by the shaft in the axial advancing process.

In one embodiment, the fins 100 are preferably spaced 1mm from the inner wall of the reaction chamber of the tubular reactor. The smaller the distance, the less the fouling substances are led to the inside of the reactor, and the better the heat transfer effect of the reactor is.

As described above, the invention provides a fin, a stirring shaft and a tubular reactor, which can strengthen mixing, improve reaction rate, and simultaneously do not need frequent cleaning, crystallization and bonding, and can be used for continuous production (the workload of the traditional reaction kettle equipment is about 5 hours including preparation to experiment and cleaning, and the equipment can be completed in 15 minutes), and can ensure that the equipment for reaction heat transfer (double heat exchange performance, which can quickly and timely take away the reaction heat and avoid strong heat release and explosion) can greatly improve product quality, production efficiency and safety; the method can well remove and inhibit the crystal from adhering to the wall, and avoids shutdown cleaning (the traditional reaction kettle is manually cleaned in a reaction cavity, needs to prevent static electricity, is dangerous, time-consuming and labor-consuming, can control scaling substances with the wall thickness of 1mm, can be dissolved by flushing a solvent, and hardly needs to be stopped); the single equipment capability of the invention can replace a plurality of kettle type equipment, thus saving resource space.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.

Claims

1. The fin is characterized by comprising a T-shaped fin body with a liquid facing surface and a liquid backing surface, wherein the T-shaped fin body comprises a root and an end part, and the end part comprises an expansion part which expands from the connection part of the end part and the root to two sides.

2. The fin according to claim 1,

the expansion part comprises a first side edge and a second side edge, and an included angle alpha is formed between the first side edge and the second side edge;

preferably, the angle is preferably 75-85 °, and most preferably about 80 °.

3. The fin of claim 2, wherein the end portion further comprises a front end portion connected to the flared portion, the front end portion including third and fourth sides extending vertically from the first and second sides, respectively.

4. The fin as claimed in claim 1, wherein the liquid-facing surface forms a backward inclination angle β from the middle to both ends;

preferably, the rearward inclination is 167-.

5. The fin of claim 4, wherein the liquid facing surface comprises a first liquid facing surface and a second liquid facing surface, the first liquid facing surface and the second liquid facing surface forming the backward tilt angle;

preferably, the liquid level further comprises a third liquid level, and the first liquid level is connected with the second liquid level through the third liquid level.

6. The fin according to claim 1, wherein the thickness of the fin body gradually increases from the end portion to the root portion, and the back liquid surface forms a forward rake angle γ from the end portion to the root portion;

preferably, the anteversion angle is preferably 84-90 °, and most preferably about 87 °.

7. A stirring shaft comprising a shaft body and a plurality of fins as set forth in any of claims 1 to 6 arranged on an outer peripheral surface of said shaft body.

8. A mixer shaft as claimed in claim 7,

a stirring rod is arranged between the adjacent fins;

and/or adjacent said fins have an axial overlap region;

and/or the fins are arranged spirally in the circumferential direction;

9. A tubular reactor having a stirring shaft according to any of claims 7 to 8.

10. The tubular reactor according to claim 9,

the tubular reactor also comprises a reaction cavity, the reaction cavity comprises an outer jacket, the outer jacket comprises an inner layer and an outer layer, the inner layer and the outer layer form an annular channel, and the annular channel is used for circulating a heat exchange medium;