Explosion polymerization prevention device of polystyrene reaction kettle

Abstract

The utility model relates to the technical field of reaction kettles, in particular to an anti-explosion polymerization device of a polystyrene reaction kettle, which structurally comprises a reaction kettle body, a feed port arranged at the top of the reaction kettle body, a stirring mechanism arranged above the reaction kettle body and used for stirring materials in the reaction kettle body, and a discharge pipe arranged at the bottom of the reaction kettle body. By arranging the feeding valve, the flow guide pipe, the three-way pipe, the first feeding pipe, the second feeding pipe, the first control valve and the second control valve, when stirring fails due to the fact that a stirring mechanism breaks down, ethylbenzene and nitrogen are injected into the reaction kettle body, and then the ethylbenzene and the nitrogen are fed into the reaction kettle body. Therefore, the concentration of styrene in the reaction kettle body is diluted, the reaction speed is stopped and slowed down, a stirring effect is achieved to a certain extent, a cooling effect on the reaction kettle is achieved, the temperature in the reaction kettle is prevented from increasing quickly, and the safety of equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of reactors, in particular to an explosion-proof device for a polystyrene reactor. Background Art

[0002] Polystyrene is a polymer synthesized from styrene monomers through free radical addition polymerization. It is a colorless and transparent thermoplastic. During the processing of polystyrene, styrene and various additives are mixed in a certain proportion, and then pumped into a polymerization reactor with a pump, and the materials are stirred in the polymerization reactor.

[0003] Patent document CN208852891U discloses a polystyrene reactor for chemical industry processing, which belongs to the field of reactor equipment and includes a reaction tank, the reaction tank being arranged above a detachable support seat, the bottom of the reaction tank being connected to a material extraction pipe, the inner wall of the reaction tank being provided with a heat-insulating interlayer, the outer wall of the reaction tank being provided with a touch-screen operation screen, the touch-screen operation screen being electrically connected to a resistive heating plate via a transformer, the resistive heating plate being installed inside the reaction tank, the interior of the reaction tank being provided with an agitator, and the upper portion of the agitator being connected to a reducer via a rotating central shaft;

[0004] In its actual application, the following deficiencies still exist: in the existing polystyrene reactor, when polystyrene is produced by the continuous bulk method, due to the high concentration of styrene monomer in the prepolymerization reactor, once the stirring fails, the reaction heat cannot be dissipated in time, and the temperature in the reactor will rise at an accelerated rate. At this time, if there is no effective cooling measure, the reaction can easily get out of control, posing certain safety hazards. Utility Model Content

[0005] The utility model provides an explosion-proof device for a polystyrene reactor, which can effectively solve the above problems.

[0006] The utility model is achieved in this way:

[0007] A polystyrene reactor explosion-proof device comprises: a reactor body, a feed port provided at the top of the reactor body, a stirring mechanism for stirring the material in the reactor body provided above the reactor body, a discharge pipe provided at the bottom of the reactor body, a feed valve provided at the bottom of the reactor body, one end of the feed valve being connected to the inner bottom of the reactor body, and the other end being connected to a flow guide pipe, a tee being connected to the flow guide pipe, one end of the tee being connected to the flow guide pipe, and the other two ends being respectively connected to a first feed pipe and a second feed pipe, and a first control valve and a second control valve being respectively provided between the first feed pipe, the second feed pipe and the tee.

[0008] As a further improvement, the feed valves are provided with six and are evenly distributed in a ring shape at the bottom of the reactor body; the flow guide pipe includes an annular pipe and a branch pipe provided at the top of the annular pipe and connected to each feed valve.

[0009] As a further improvement, the feed valve includes a valve body, the valve body is provided with a first channel connected to the branch pipe, and a second channel connected to the reactor body, an electromagnetic control component is provided at one end of the valve body, a valve stem connected to the electromagnetic control component is provided in the valve body, and a valve core is provided at one end of the valve stem facing the reactor body.

[0010] As a further improvement, the end of the valve core facing the reactor body is provided with a curved surface corresponding to the inner wall of the reactor body.

[0011] As a further improvement, the second passage connecting the valve body and the reactor body is arranged at an angle.

[0012] As a further improvement, the guide pipe and the three-way pipe are detachably connected, the bottom of the discharge pipe is connected to a material conveying pump, and a third control valve is provided between the discharge pipe and the material conveying pump.

[0013] The beneficial effects of the utility model are:

[0014] The utility model is provided with a feed valve, a flow guide pipe, a tee pipe, a first feed pipe, a second feed pipe, a first control valve and a second control valve. When a stirring mechanism fails and stirring fails, ethylbenzene and nitrogen are poured into the reactor body, thereby diluting the styrene concentration in the reactor body, terminating and slowing down the reaction speed, and playing a stirring role to a certain extent, playing a cooling role on the reactor, avoiding accelerated temperature rise in the reactor, and improving the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a structural schematic diagram of an explosion-proof device for a polystyrene reactor provided by the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of a partial reactor body provided by the utility model;

[0018] Figure 3 This is a structural diagram of the bottom of the reactor body provided by the utility model;

[0019] Figure 4 This is a schematic structural diagram of the reactor body provided by the present invention when viewed from above;

[0020] Figure 5 This is a schematic diagram of the structure of the reactor body provided by the utility model from a top view;

[0021] Figure 6 It is a schematic structural diagram of a cross-section of a feed valve provided by the utility model.

[0022] In the figure: reactor body 1, feed port 11, stirring mechanism 2, discharge pipe 3, feed valve 4, flow guide pipe 5, tee pipe 6, first feed pipe 7, second feed pipe 8, first control valve 71, second control valve 81, annular pipe 51, branch pipe 52, valve body 41, electromagnetic control assembly 42, valve stem 43, valve core 44, material delivery pump 9, third control valve 10. DETAILED DESCRIPTION

[0023] All embodiments of the present invention fall within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort fall within the scope of protection of the present invention.

[0024] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as referring to the purpose, technical solutions and advantages of the methods. To be clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work indicate or imply relative importance or implicitly indicate the number of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0025] In existing polystyrene reactors, when using a continuous bulk process to produce polystyrene, due to the high concentration of styrene monomer in the prepolymerization reactor, once the stirring fails, the reaction heat cannot be dissipated in time, and the temperature in the reactor will rise at an accelerated rate. At this time, if there is no effective cooling measure, the reaction can easily get out of control, posing certain safety risks. To solve the above technical problems, this case proposes the following technical solutions:

[0026] Reference Figures 1 to 6 As shown, an explosion-proof device for a polystyrene reactor comprises: a reactor body 1, a feed port 11 is provided on the top of the reactor body 1, a stirring mechanism 2 for stirring the material in the reactor body 1 is provided above the reactor body 1, a discharge pipe 3 is provided at the bottom of the reactor body 1, a feed valve 4 is further provided at the bottom of the reactor body 1, one end of the feed valve 4 is connected to the bottom of the reactor body 1, and the other end is connected to a guide pipe 5, a tee pipe 6 is connected to the guide pipe 5, one end of the tee pipe 6 is connected to the guide pipe 5, and the other two ends are respectively connected to a first feed pipe 7 and a second feed pipe 8, and a first control valve 71 and a second control valve 81 are respectively provided between the first feed pipe 7, the second feed pipe 8 and the tee pipe 6;

[0027] During use, the materials are fed into the reactor body 1 through the feed port 11, and the materials are stirred by the stirring mechanism 2. At the same time, the first feed pipe 7 and the second feed pipe 8 are connected to ethylbenzene and nitrogen respectively. When the stirring mechanism 2 fails and the stirring fails, the first control valve 71 is opened first, and then the feed valve 4 is opened to promote ethylbenzene to enter the bottom of the reactor body 1 along the first feed pipe 7 and the tee pipe 6, thereby diluting the styrene concentration in the reactor body 1, terminating and slowing down the reaction speed. After pouring in an appropriate amount of ethylbenzene, the first control valve 71 is closed and the second control valve 81 is opened to promote nitrogen to enter the bottom of the reactor body 1 along the second feed pipe 8 and the tee pipe 6, thereby promoting ethylbenzene to be fully dispersed in the reactor body 1, playing a stirring role to a certain extent, cooling the reactor, avoiding the accelerated temperature rise in the reactor, and improving the safety of the equipment.

[0028] Furthermore, six feed valves 4 are provided and are evenly distributed in a ring shape at the bottom of the reactor body 1; the flow guide pipe 5 includes an annular pipe 51 and a branch pipe 52 provided at the top of the annular pipe 51 and connected to each feed valve 4. Therefore, after ethylbenzene and nitrogen enter the annular pipe 51 through the first feed pipe 7 and the second feed pipe 8, they are transported to the bottom of the reactor body 1 through the branch pipe 52, thereby promoting the uniform distribution of ethylbenzene and nitrogen at the bottom of the reactor body 1, which helps to improve the uniformity and efficiency of the reaction.

[0029] Specifically, the feed valve 4 includes a valve body 41, the valve body 41 having a first channel connected to the branch pipe 52 and a second channel connected to the reactor body 1. An electromagnetic control component 42 is provided at one end of the valve body 41. A valve stem 43 connected to the electromagnetic control component 42 is provided in the valve body 41. A valve core 44 is provided at the end of the valve stem 43 facing the reactor body 1.

[0030] like Figure 6 As shown, when in use, the electromagnetic control component 42 drives the valve stem 43 to move leftward in the valve body 41 first, thereby causing the first channel to be connected with the second channel. At this time, ethylbenzene and nitrogen can enter the interior of the reactor body 1 for a cooling reaction; when the electromagnetic control component 42 drives the valve stem 43 to move rightward in the valve body 41 first, the first channel and the second channel are blocked, ensuring the normal operation of the reactor body 1.

[0031] It should be noted that the reactor body 1 is provided with a controller connected to the electromagnetic control components 42 on each feed valve 4. When in use, the controller can simultaneously control the opening and closing of the feed valve 4;

[0032] The electromagnetic control component 42 drives the valve stem 43 and the valve core 44 to move in the valve body 41 to control the blocking and connection of the first channel and the second channel. The working principle is the same as the working principle of a conventional solenoid valve. The specific principle is known to people in this field and will not be described in detail here.

[0033] The end of the valve core 44 facing the reactor body 1 is provided with a curved surface corresponding to the inner wall of the reactor body 1. Therefore, when the feed valve 4 is in a closed state, the inner side of the valve core 44 fits tightly against the inner wall of the reactor body 1, thereby ensuring that the material in the reactor body 1 can be fully mixed and preventing the material from being stuck in the second channel between the valve core 44 and the valve body 41.

[0034] like Figure 4-5 As shown, the second channel connecting the valve body 41 and the reactor body 1 is arranged at an angle, so that when ethylbenzene and nitrogen pass through the valve body 41 and enter the reactor body 1, a vortex is formed, thereby prompting ethylbenzene and nitrogen to be quickly and evenly distributed in the reactor body 1 for reaction, and at the same time further promoting the stirring of the materials in the reactor body 1, which has a cooling effect on the reactor.

[0035] Furthermore, the flow guide pipe 5 and the tee pipe 6 are detachably connected, a material delivery pump 9 is connected to the bottom of the discharge pipe 3, and a third control valve 10 is provided between the discharge pipe 3 and the material delivery pump 9. When in use, if the stirring mechanism 2 of the reactor body 1 fails and the stirring fails, the third control valve 10 can be opened, so that the material in the reactor body 1 can be quickly extracted through the discharge pipe 3 by the material delivery pump 9, thereby preventing the temperature in the reactor from accelerating.

[0036] During the unloading process, when the discharge pipe 3 or the third control valve 10 is blocked, since the guide pipe 5 and the three-way pipe 6 are detachably connected, the guide pipe 5 and the three-way pipe 6 can be detached, and the guide pipe 5 is connected to the inlet of the material conveying pump 9. At the same time, the feed valve 4 is opened to extract the material in the reactor body 1 through the guide pipe 5 to avoid the accelerated temperature rise in the reactor, thereby further improving the safety of the equipment.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An anti-explosion device for a polystyrene reactor, comprising: A reactor body (1) is provided with a feed port (11) at the top of the reactor body (1), a stirring mechanism (2) for stirring the material in the reactor body (1) is provided above the reactor body (1), and a discharge pipe (3) is provided at the bottom of the reactor body (1), characterized in that a feed valve (4) is further provided at the bottom of the reactor body (1), one end of the feed valve (4) is connected to the bottom of the reactor body (1), and the other end is connected to a guide pipe (5), a three-way pipe (6) is connected to the guide pipe (5), one end of the three-way pipe (6) is connected to the guide pipe (5), and the other two ends are respectively connected to a first feed pipe (7) and a second feed pipe (8), and a first control valve (71) and a second control valve (81) are respectively provided between the first feed pipe (7), the second feed pipe (8) and the three-way pipe (6).

2. The anti-explosion device for a polystyrene reactor according to claim 1, characterized in that: The feed valves (4) are provided with six and are evenly distributed in an annular shape at the bottom of the reactor body (1); the flow guide pipe (5) comprises an annular pipe (51) and a branch pipe (52) provided at the top of the annular pipe (51) and connected to each feed valve (4).

3. The anti-explosion device for a polystyrene reactor according to claim 2, characterized in that: The feed valve (4) comprises a valve body (41), the valve body (41) being provided with a first channel communicating with a branch pipe (52), and a second channel communicating with a reactor body (1), an electromagnetic control assembly (42) being provided at one end of the valve body (41), a valve stem (43) being provided in the valve body (41) and being connected to the electromagnetic control assembly (42), and a valve core (44) being provided at one end of the valve stem (43) facing the reactor body (1).

4. The anti-explosion device for a polystyrene reactor according to claim 3, characterized in that: One end of the valve core (44) facing the reactor body (1) is provided with an arc surface corresponding to the inner wall of the reactor body (1).

5. The anti-explosion device for a polystyrene reactor according to claim 4, characterized in that: The second passage connecting the valve body (41) and the reactor body (1) is arranged at an angle.

6. The anti-explosion device for a polystyrene reactor according to claim 1, characterized in that: The flow guide pipe (5) and the three-way pipe (6) are detachably connected, the bottom of the discharge pipe (3) is connected to a material conveying pump (9), and a third control valve (10) is provided between the discharge pipe (3) and the material conveying pump (9).

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