CN222789039U - Oblique leaf stirring device for preparing polyolefin by slurry method - Google Patents
Oblique leaf stirring device for preparing polyolefin by slurry method Download PDFInfo
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- CN222789039U CN222789039U CN202421552862.0U CN202421552862U CN222789039U CN 222789039 U CN222789039 U CN 222789039U CN 202421552862 U CN202421552862 U CN 202421552862U CN 222789039 U CN222789039 U CN 222789039U
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Abstract
本实用新型涉及一种淤浆法制备聚烯烃的斜叶搅拌装置，包括搅拌反应器本体，内设斜叶框式搅拌器，所述斜叶框式搅拌器包括一搅拌轴、至少一个竖向桨板和多个横向桨板，所述竖向桨板与所述搅拌轴间隔设置，所述横向桨板安装在所述竖向桨板与所述搅拌轴之间并形成镂空的框架结构，所述横向桨板相对于所述搅拌轴垂直的水平面翻转一定角度设置。与现有技术相比，采用斜叶框式搅拌器在反应过程实现了液体充分流动，确保反应体系中的物质完全混合，避免局部出现死区，防止反应物料的沉降和堆积，提高了传热和传质效果，有助于提高聚合反应效率。
The utility model relates to an inclined blade stirring device for preparing polyolefins by a slurry process, comprising a stirring reactor body, an inclined blade frame stirrer arranged therein, the inclined blade frame stirrer comprising a stirring shaft, at least one vertical paddle plate and a plurality of transverse paddle plates, the vertical paddle plate being arranged at intervals from the stirring shaft, the transverse paddle plate being installed between the vertical paddle plate and the stirring shaft to form a hollow frame structure, the transverse paddle plate being arranged to be flipped at a certain angle relative to a horizontal plane perpendicular to the stirring shaft. Compared with the prior art, the inclined blade frame stirrer is adopted to realize full flow of liquid in the reaction process, ensure complete mixing of substances in the reaction system, avoid local dead zones, prevent sedimentation and accumulation of reaction materials, improve heat transfer and mass transfer effects, and help improve polymerization reaction efficiency.
Description
Technical Field
The utility model relates to the technical field of polyolefin preparation, in particular to an inclined blade stirring device for preparing polyolefin by a slurry method.
Background
Ultra-high molecular weight polyethylene (UHMWPE) is a very widely used product in polyolefin, and its production process mainly includes solution process, slurry process, gas phase process, wherein the slurry process is relatively mature in technology and the product quality is better, and is the main method for producing UHMWPE. Slurry processes are those in which an aliphatic hydrocarbon solvent is mixed with ethylene and a polymer is formed in the presence of a catalyst, the polymer being suspended in the solvent. The reactor type is divided into a tubular slurry process and a kettle-type slurry process, and most of the processes currently adopt kettle-type slurry processes. When UHMWPE is prepared by a kettle-type slurry method, the stirring reaction device is a core component of the preparation process, and the quality of UHMWPE products is directly determined.
As shown in figure 1, the relatively mature stirring reactor in the prior art adopts a three-layer radial turbine stirrer, and in a polymerization system with higher viscosity of the ultra-high molecular weight polyethylene, the stirring effect of the stirrer is not ideal, the stirring is easy to laminate, dead zones exist, and the stirring is not uniform and thorough. In the polymerization process, UHMWPE is easy to subside, the polymerization reaction is a strong exothermic reaction, and under the conditions of poor dispersion effect and unsatisfactory heat removal effect, local hot spots are easy to form in the reactor, so that the problems of explosion aggregation, wall adhesion, caking and the like of materials are generated. Therefore, how to provide an improved stirring device suitable for preparing ultra-high molecular weight polyethylene by a slurry process is a technical problem to be solved in the art.
Disclosure of utility model
The utility model aims to solve the problems and provide a inclined blade stirring device for preparing polyolefin by a slurry method.
The aim of the utility model is achieved by the following technical scheme:
An oblique blade stirring device for preparing polyolefin by a slurry method comprises a stirring reactor body, wherein stirring equipment is arranged in the stirring reactor body, the stirring equipment is an oblique She Kuangshi stirrer,
The oblique She Kuangshi stirrer comprises a stirring shaft, at least one vertical paddle board and a plurality of transverse paddle boards,
The vertical paddle board is arranged at intervals with the stirring shaft, the transverse paddle board is arranged between the vertical paddle board and the stirring shaft and forms a hollowed-out frame structure, and the transverse paddle board is arranged at a certain angle relative to the vertical horizontal plane of the stirring shaft in a turnover mode.
The vertical paddle board of the inclined She Kuangshi stirrer enables the slurry to generate a large vortex in a range, so that a large circulation in a full kettle range is formed, the liquid is enabled to generate an axial mixing effect through the overturning design of the horizontal paddle board, the formation of the circulation flow is promoted, the stirrer with the structure enables the liquid to be fully flowed and dispersed in the stirring process, and therefore a better stirring and dispersing effect is achieved, the dispersion of reaction materials is facilitated, the reaction is promoted, and the reaction efficiency is improved.
As an preferable technical scheme, 2-4 vertical paddles are arranged, and even more preferable, the vertical paddles are arranged at equal intervals by taking the stirring shaft as a central shaft. In a particularly preferred embodiment, two vertical paddles are symmetrically arranged with the stirring shaft as a symmetry axis.
As the preferable technical scheme, the vertical paddle board is a rectangular strip-shaped plate, the vertical paddle board and the central vertical plane of the stirring shaft are obliquely arranged at a certain included angle, and the included angle is 15-45 degrees, such as 15 degrees, 30 degrees, 45 degrees and the like.
As a preferable technical scheme, the transverse paddle boards are arranged between the stirring shaft and the vertical paddle boards in parallel along the transverse direction, and the overturning angle of the transverse paddle boards relative to the horizontal plane is 30-60 degrees, such as 30 degrees, 45 degrees and 60 degrees.
As a preferred solution, the transverse paddles are arranged in 3-6 rows, for example 3 rows, 4 rows, 5 rows, 6 rows, etc.
As a preferable technical scheme, the transverse paddle board is a flat board or an arc-shaped board, and is preferably an arc-shaped board.
As an optimal technical scheme, the transverse paddles are arranged at two sides of the stirring shaft and are arranged in a central symmetry manner, and the directions of the transverse paddles at two sides of the stirring shaft, which are opposite, are opposite to each other relative to the turning direction of the horizontal plane;
And/or, the directions of the adjacent transverse paddles positioned on the same side and on the upper side and the lower side are opposite relative to the horizontal plane.
As the preferable technical scheme, a bottom bearing is arranged at the bottom of the reaction kettle of the stirring reactor body through a bracket, and the bottom bearing is arranged at the tail end of the stirring shaft.
The utility model adopts an inclined She Kuangshi stirring structure in the slurry method for preparing the ultra-high molecular weight polyethylene, and the concrete working process is that when a stirring shaft rotates, a vertical paddle board and a horizontal paddle board rotate along with each other and are matched with each other to generate a complex flow field. The vertical paddle board forms radial flow, and the design of the horizontal paddle board overturn enables the liquid to generate the effect of vertical axial flow, namely, the structure enables the liquid to fully flow in the stirring process, thereby realizing better stirring and dispersing effects, being beneficial to mixing reaction substances, promoting the reaction and improving the reaction efficiency. In addition, the transverse paddle board is arranged on the vertical paddle board and forms a hollowed frame structure with the stirring shaft, so that the flow resistance is small during rotation, the shearing performance of a central area is enhanced during rotation, and the stirring system is very suitable for a stirring system of ultra-high molecular weight polyethylene. Therefore, the slurry liquid can fully flow in the stirring process by the unique structural design and action principle of the oblique She Kuangshi stirring, better stirring effect is realized, the reaction efficiency is improved, and the problems of non-uniformity, dead zone, sedimentation, uneven heat dissipation and the like in the reaction process are solved.
Compared with the prior art, the utility model has the following beneficial effects:
The inclined She Kuangshi stirrer is adopted, so that the up-and-down flow of liquid is realized in the reaction process of preparing the ultra-high molecular weight polyethylene by a slurry method, and the stirring and the dispersion are more sufficient. The inclined She Kuangshi is stirred to penetrate the reaction kettle up and down along the axial direction, so that the substances in the reaction system can be thoroughly and completely mixed, dead zones are avoided to be locally generated, the reaction uniformity is ensured, the sedimentation and accumulation of the reaction substances are effectively prevented through the action of the inclined She Kuangshi stirrer, the uniformity and stability of the reaction system are maintained, the heat transfer and mass transfer effects are improved, and the polymerization reaction efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art turbine stirred reactor;
FIG. 2 is a schematic structural view of the stirring device of the present utility model;
FIG. 3 is a schematic diagram showing a front view of a stirring apparatus according to an embodiment of the present utility model;
FIG. 4 is a schematic top view of a stirring device according to an embodiment of the present utility model;
Fig. 5 is a schematic view of the angle of the transverse paddle turning over relative to the horizontal.
The device comprises a 1-motor, a 2-speed reducer, a 3-bracket, a 4-manhole, a 5-feed inlet, a 6-support, a 7-cylinder, an 8-stirring shaft, a 9-vertical paddle board, a 10-transverse paddle board, a 11-discharge outlet and a 12-bottom bearing.
Detailed Description
The following discloses a number of different embodiments or examples of implementing the subject technology. Specific examples of components and arrangements are described below for purposes of simplifying the disclosure, and of course, these are merely examples and are not intended to limit the scope of the utility model. For example, a first feature described later in this specification may be formed above or on a second feature, and may include embodiments in which the first and second features are formed in direct contact, as well as embodiments in which additional features may be formed between the first and second features, such that no direct contact may be made between the first and second features. In addition, the disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Further, where a first element is described as being coupled or combined with a second element, the description includes embodiments in which the first and second elements are directly coupled or combined with each other, and also includes embodiments in which one or more other intervening elements are added to indirectly couple or combine the first and second elements with each other.
Additionally, it should be understood that the positional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the positional or positional relationship shown in the drawings, and are merely for convenience of describing and simplifying the present utility model, and the positional terms do not indicate or imply that the apparatus or element to be referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of the present utility model, and the positional terms "inner and outer" refer to the inner and outer sides of the outline of each component itself, and the terms such as "first", "second", etc. are used to define the components, merely for convenience of distinguishing the corresponding components, if not otherwise stated, and are not meant to have any special meaning, and therefore should not be construed as limiting the scope of the present utility model.
Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "some embodiments" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.
The present utility model is described in detail below, but the technical proposal disclosed in the art is not described in detail.
Fig. 1 shows a currently mature stirring reactor, which adopts a turbine stirrer, three turbine stirring paddles are sequentially arranged on a stirring shaft from top to bottom, the stirrer is easy to generate layering phenomenon during stirring, dead zones exist, stirring is not uniform and thorough, and the dispersing effect is not ideal when the stirring reactor is applied to an ultra-high molecular weight polyethylene polymerization system. The UHMWPE has very high molecular weight, generally above 200w, sedimentation easily occurs in the polymerization process, the polymerization reaction is a strong exothermic reaction, if the dispersion effect is poor and the heat removal is not timely, local hot spots easily exist in the reactor, so that the problems of wall adhesion and caking of materials are caused, the quality of a product is influenced, and the blockage of a rear system is easily caused.
In order to solve the technical problems, the inventor provides a novel inclined blade stirring device for preparing polyolefin by a slurry method. As shown in fig. 2, the stirring device comprises a stirring reactor body, wherein a main part of the stirring reactor body is a cylindrical stirring reaction kettle, and stirring equipment is arranged in a barrel 7 of the stirring reaction kettle. The upper end of the stirring reaction kettle is provided with a speed reducer 2 through a bracket 3, the upper end of the speed reducer 2 is provided with a motor 1, the motor 1 is in transmission connection with the speed reducer 2, the output end of the speed reducer 2 is in transmission connection with a stirring shaft 8 of stirring equipment through a connecting shaft and drives the stirring equipment to rotate, and the reaction materials in the kettle are stirred and dispersed. The upper portion of the reaction kettle is provided with a support 6 for installation, the top is provided with a manhole 4 and at least one feed inlet 5, the lower end is provided with at least one discharge outlet 11, and the manhole 4 and the at least one discharge outlet 11 are conventional auxiliary parts of the reactor and are not repeated here.
The stirring device is provided with stirring equipment in a stirring reactor body, and specifically adopts an inclined She Kuangshi stirrer, and referring to fig. 2 and 3, the inclined She Kuangshi stirrer comprises a stirring shaft 8, at least one vertical paddle 9 and a plurality of horizontal paddles 10, the vertical paddle 9 and the stirring shaft 8 are vertically arranged at a certain interval, and the horizontal paddles 10 are arranged between the vertical paddle 9 and the stirring shaft 8 and form a hollowed frame structure. Referring to fig. 5, the transverse paddle 10 is turned over an angle β, for example 30-60 °, preferably 45 °, relative to the horizontal plane B perpendicular to the stirring shaft 8. When the stirring shaft 8 rotates, the vertical paddle 9 and the horizontal paddle 10 rotate along with the stirring shaft and are mutually matched to generate a complex flow field, namely, the vertical paddle 9 forms annular slurry flow, the horizontal paddle 10 is turned over relative to the horizontal plane, so that the liquid generates an up-and-down flow effect, the liquid can fully flow in the stirring process, a better stirring and dispersing effect is realized, the mixing of reaction substances is facilitated, the reaction is promoted, and the reaction efficiency is improved. In addition, the transverse paddle board 10 is arranged on the vertical paddle board 9 and forms a hollowed frame structure with the stirring shaft 8, so that the flow resistance is small during rotation, and the device is suitable for an ultrahigh molecular weight polyethylene reaction system with higher viscosity.
As a preferred embodiment, 2 to 4 vertical paddles 9 may be provided as needed, and further preferably, the vertical paddles 9 are provided at equal intervals, for example, 4 or 3 or 2 are provided at equal intervals with the stirring shaft 8 as a central axis. For example, in a specific embodiment, referring to fig. 3, two vertical paddles 9 are symmetrically disposed with respect to the stirring shaft 8 as a symmetry axis, and the vertical paddles 9 are rectangular elongated plate members. Referring to fig. 4, as a more preferred embodiment, the vertical paddles 9 are inclined at an angle α of 15-45 °, for example preferably 30 °, to the central vertical plane a of the stirring shaft 8. The inclined setting mode increases the stirring area, the liquid can be disturbed and pushed more in the stirring process, so that the stirring area is enlarged, namely, the contact area between the liquid and the paddle board is increased, stronger liquid driving force and shearing force are generated in the stirring process, the liquid is mixed more fully, the increased stirring intensity is favorable for scattering the lumps in the liquid, and the uniform dispersion of substances is promoted. In addition, the inclined vertical paddle 9 can reduce dead zones in the stirrer, liquid is easier to push and stir to the dead zone areas, tangential flow is eliminated, non-uniformity in a reaction system is reduced, and stirring effect is improved.
As a preferred embodiment, the transverse paddles 10 are arranged in parallel in the transverse direction between the stirring shaft 8 and the vertical paddles 9, the transverse paddles 10 being arranged turned over by an angle β with respect to the horizontal, the transverse paddles 10 being arranged in 3-6 rows as desired, e.g. in a specific embodiment of the utility model, in 5 rows. Referring to fig. 3, in a preferred embodiment of the present utility model, the transverse paddles 10 are symmetrically installed at both sides of the stirring shaft 8, and the directions of the transverse paddles 10 at both sides of the stirring shaft 8 are reversed with respect to the horizontal plane. Alternatively, the directions of turning over the adjacent transverse paddles 10 on the same side with respect to the horizontal plane may be reversed. By the structure, multiple axial flow fields with different flow directions can be generated near the transverse paddle board 10, and the liquid stirring and dispersing effects are better. Further, the transverse paddle 10 may be a flat plate or an arcuate plate, which is more effective than a flat plate arcuate plate (see fig. 3). The arc plate is adopted to enable the fluid to flow along a certain curve, so that the fluid movement can be smoothly guided, and the vortex generation is reduced. In addition, the curved plate can generate stronger liquid pushing force and shearing force, so that dead zones in the stirrer are reduced, and liquid is easily pushed and stirred to the dead zone areas.
In order to improve the stability of the stirring equipment, the bottom bearing 12 is arranged at the bottom of the stirring reaction kettle through the bracket, and the bottom bearing 12 is arranged at the tail end of the stirring shaft 8 of the stirring equipment, so that the stirring equipment is stabilized.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present utility model. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present utility model is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present utility model.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421552862.0U CN222789039U (en) | 2024-07-03 | 2024-07-03 | Oblique leaf stirring device for preparing polyolefin by slurry method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202421552862.0U CN222789039U (en) | 2024-07-03 | 2024-07-03 | Oblique leaf stirring device for preparing polyolefin by slurry method |
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| CN222789039U true CN222789039U (en) | 2025-04-25 |
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| CN202421552862.0U Active CN222789039U (en) | 2024-07-03 | 2024-07-03 | Oblique leaf stirring device for preparing polyolefin by slurry method |
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