Large polymerization kettle jacket heat removal structure
By setting multiple heat removal medium inlets and outlets in the jacket of a large polymerization reactor, the problem of local stagnant areas in the jacket is solved, the heat exchange efficiency and temperature uniformity are improved, and the service life of the equipment and production control effect are improved.
Patent Information
- Application Number
- CN202422514491.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-10-17
AI Technical Summary
The existing polymerization reactor jacket structure has local areas where the heat removal medium does not flow after being scaled up, resulting in low heat exchange efficiency, scaling and corrosion problems, and uneven temperature control, affecting production efficiency and equipment life.
Multiple heat removal medium inlets are set at the bottom and middle of the polymerization kettle jacket, and multiple heat removal medium outlets are set at the top. The medium inlet direction enters along the tangent of the jacket to form a uniform flow, eliminate the stagnant flow area, improve the heat exchange efficiency and reduce the temperature difference.
It effectively eliminates the dead zone in the jacket, improves the heat exchange efficiency and heat transfer efficiency, reduces the scaling rate, achieves better temperature control, and increases the service life and production efficiency of the equipment.
Smart Images
Figure CN223376424U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of polymerization kettles, and more specifically, relates to a jacket heat removal structure for a large polymerization kettle. Background Art
[0002] The core equipment of synthetic rubber production is the polymerization kettle, which plays a key role in the polymer production process - mass transfer and heat removal. Because the polymer releases a lot of heat energy in the process of polymerizing small molecular monomers into high molecular polymers, and the temperature affects the microstructure of the polymer, so controlling the temperature of the material in the polymerization kettle becomes the key to controlling product quality. With the expansion of production scale, in order to meet the production capacity, the volume of the core equipment polymerization kettle has been increased from 10m3 to 20m4. 3 The image has been enlarged to 80m. 3 About, but, as Figure 1 As shown, the jacketed heat removal structure of the polymerization kettle still has a single inlet N1 and a single outlet N2. The cooling medium is introduced from the bottom inlet and is discharged from the top outlet after heat exchange to take away the heat.
[0003] This structure has a single inlet and a single outlet, and has the following disadvantages: First, when the reactor volume is small, the local heat removal medium stagnant area in the jacket is small, and the jacket area that affects the heat exchange effect is small. When the polymerization reactor volume is greatly expanded, the local heat removal medium stagnant area in the jacket increases significantly ( Figure 1 The shaded area in the middle) is the area of the jacket that basically does not participate in the heat removal effect; second, there are problems of circulating water scaling and corrosion in the slow-flowing or non-flowing areas of the local heat removal medium in the jacket, which affects the service life of the equipment; third, the jacket cooling medium has a single inlet and a single outlet. The temperature difference of the heat removal medium at the part where the equipment enters is large, and the heat removal efficiency is high. However, the temperature difference between the heat removal medium in the jacket at the upper and middle part of the kettle body and the material in the kettle is small, the heat transfer efficiency is greatly reduced, and the heat removal effect basically disappears. This contradiction is particularly prominent in the production process where the material temperature in the polymerization kettle is controlled below 100°C, and the production line where the heat removal medium is 30°C circulating water. In order to meet the temperature control requirements, most production lines adopt the method of reducing production load to solve this contradiction. Utility Model Content
[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the embodiments of the present application is to provide a large-scale polymerization kettle jacket heat removal structure, which can effectively eliminate the non-flowing area of the heat removal medium and improve the heat exchange efficiency.
[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a large-scale polymerization kettle jacket heat removal structure, comprising: a kettle body and a jacket arranged on the outside of the kettle body, at least two first heat removal medium inlets are provided at the bottom of the jacket, at least two second heat removal medium inlets are provided in the middle of the jacket, and at least two heat removal medium outlets are provided at the top of the jacket.
[0006] In one embodiment, the entry direction of the second heat removal medium inlet is the tangential direction of the jacket.
[0007] In one embodiment, four first heat removal medium inlets are arranged at equal arc distances.
[0008] In one embodiment, four second heat removal medium inlets are arranged at equal arc distances.
[0009] In one embodiment, four heat removal medium outlets are arranged at equal arc distances.
[0010] In one embodiment, the first heat removal medium inlet enters from bottom to top.
[0011] The beneficial effects of the large-scale polymerization kettle jacket heat removal structure provided in this application are:
[0012] 1. By arranging a second heat removal medium inlet in the middle of the jacket, the heat removal efficiency can be improved, and a flow area is formed near multiple heat removal medium outlets, thereby effectively eliminating the heat removal medium non-flow area.
[0013] 2. The entry direction of the second heat removal medium inlet is set along the tangential direction of the jacket, which can disturb the problem of direct flow of the heat removal medium, make the heat removal medium more uniform, avoid the formation of penetrating flow of the medium injected at the bottom, make the temperature of various parts of the kettle more consistent, and improve the local heat exchange efficiency; at the same time, the formed fluid plays a flushing role, reduces the formation rate of scaling on the inner wall of the jacket, and improves the heat exchange efficiency of the jacket; at the same time, it increases the heat removal efficiency of the middle and upper part of the jacket, can reduce the temperature difference of the heat removal medium, and improves the production control of the reaction temperature below 75°C. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0015] Figure 1 This is a schematic diagram of the layout of the inlet and outlet on the jacket of a polymerization reactor in the prior art;
[0016] Figure 2 This is a schematic diagram of the main structure of the jacket heat removal structure of a large polymerization kettle provided in an embodiment of the present application;
[0017] Figure 3 This is a schematic top view of the heat removal structure of the jacket of a large polymerization kettle provided in an embodiment of the present application.
[0018] Among them, the reference numerals in the figures are:
[0019] 1. Kettle body; 2. Jacket; 3. First heat removal medium inlet; 4. Second heat removal medium inlet; 5. Heat removal medium outlet. DETAILED DESCRIPTION
[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.
[0021] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.
[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.
[0024] like Figure 2-Figure 3 As shown, a large-scale polymerization kettle jacket heat removal structure provided in an embodiment of the present application is now described. The large-scale polymerization kettle jacket heat removal structure comprises: a kettle body 1 and a jacket 2 arranged outside the kettle body 1, the bottom of the jacket 2 is provided with at least two first heat removal medium inlets 3, preferably four at equal arc distances; the middle of the jacket 2 is provided with at least two second heat removal medium inlets 4, preferably four at equal arc distances; the top of the jacket 2 is provided with at least two heat removal medium outlets 5, preferably four at equal arc distances. Figure 3 As shown, the entry direction of the second heat removal medium inlet 4 is the tangential direction of the jacket 2; the entry direction of the first heat removal medium inlet 3 is from bottom to top. Figure 3As shown, the first heat removal medium inlet 3 and the heat removal medium outlet 5 are both located on the same radial line, while the second heat removal medium outlet 5 and the first heat removal medium outlet 5 are staggered along the circumference. To ensure balanced inflow and outflow of the heat removal medium, the diameter of the heat removal medium outlet 5 is larger than the diameter of the heat removal medium outlet 5. In this embodiment, the diameter of the heat removal medium outlet 5 is twice the diameter of the heat removal medium outlet 5. Corresponding baffles can be installed in the jacket 2 to change the flow direction of the heat removal medium.
[0025] The cold heat removal medium provided by the second heat removal medium inlet 4 enters the jacket 2 in a tangential direction, significantly reducing flow rate losses. While maintaining the same flow rate at the inlet, the flow rate of the heat removal medium in the jacket 2 is increased, and the flushing effect of the heat removal medium slows down the overall scaling rate within the jacket 2. The heat removal medium adopts a multi-inlet and multi-outlet design, completely eliminating local areas of heat removal medium stagnation within the large-volume polymerization reactor jacket 2, improving the heat exchange efficiency of the jacket 2 by approximately 10%. At the same time, the temperature difference before and after the heat removal medium heat exchange is reduced from the original 30°C inlet and 65°C outlet in the prior art to 30°C inlet and 54°C outlet, improving heat transfer efficiency. This provides an excellent technical means for production control, especially for controlling the reaction temperature below 75°C.
[0026] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.
Claims
1. A large-scale polymerization kettle jacket heat removal structure, comprising: A kettle body (1) and a jacket (2) arranged outside the kettle body (1), characterized in that: at least two first heat removal medium inlets (3) are provided at the bottom of the jacket (2), at least two second heat removal medium inlets (4) are provided in the middle of the jacket (2), and at least two heat removal medium outlets (5) are provided at the top of the jacket (2).
2. The large-scale polymerization reactor jacket heat removal structure according to claim 1, characterized in that: The entry direction of the second heat removal medium inlet (4) is the tangential direction of the jacket (2).
3. The large-scale polymerization reactor jacket heat removal structure according to claim 2, characterized in that: Four first heat removal medium inlets (3) are arranged at equal arc distances.
4. The large-scale polymerization reactor jacket heat removal structure according to claim 3, characterized in that: Four second heat removal medium inlets (4) are arranged at equal arc distances.
5. The large-scale polymerization reactor jacket heat removal structure according to claim 4, characterized in that: Four heat removal medium outlets (5) are arranged at equal arc distances.
6. The large-scale polymerization reactor jacket heat removal structure according to claim 5, characterized in that: The first heat removal medium inlet (3) enters in a direction from bottom to top.