Discharging pipeline of polypropylene product discharging system
By designing constraint components on the discharge pipe of the polypropylene product discharge system, the problem of equipment component damage caused by equipment vibration was solved, thereby improving the reliability and service life of the equipment.
Patent Information
- Application Number
- CN202520363490.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-04
AI Technical Summary
In the production of polypropylene by the gas phase process, reliability issues in the equipment components of the product discharge system, especially the discharge pipeline, include the detachment of the PDS valve air supply pipe, loosening of the damper connection threads, and frequent damage to the high-frequency discharge valve of the PBT tank.
Constraint components are designed at key parts of the feed pipe, including first, second and third constraint components. Damping shock absorbers with different damping and internal and external connecting frames are used. By setting constraint components on the outside of the pipe body, vibration is reduced and equipment damage is avoided.
It effectively reduces vibration in the feeding pipe, extends the service life of the high-frequency feeding valve, avoids damage and detachment of equipment parts, and improves the reliability of the equipment.
Smart Images
Figure CN223909106U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of chemical production equipment technology, and relates to a discharge pipe of a polypropylene product discharge system. Background Technology
[0002] The gas-phase polypropylene process is a gas-phase fluidized bed polypropylene process developed in the 1980s and has relatively mature applications. In this reaction unit, the product discharge system consists of a two-stage discharge system (PDS), containing a product tank (PC) and a product blowout tank (PBT). Polypropylene powder is intermittently fed from the PC tank to the PBT tank at intervals of approximately 3-5 minutes, and then discharged to the downstream system via a dense-phase conveying line through the PBT pipeline.
[0003] The current product discharge system has the following main problems in use: Polypropylene is discharged intermittently through the product discharge system in the reactor. During the discharge process, the polypropylene product is depressurized at each stage and finally transported to the product receiving silo via the PBT tank. However, in use, it has been found that some equipment parts are frequently damaged or detached, such as the PDS valve air supply pipe coming off, the damper connection threads becoming loose or falling off, and the PBT tank high-frequency discharge valve frequently breaking down.
[0004] Therefore, how to solve the reliability problem of equipment components in the product discharge system, especially the feeding pipeline, in the gas phase polypropylene production process has become an urgent issue. Utility Model Content
[0005] This utility model provides a discharge pipe for a polypropylene product discharge system. By designing constraint components at key parts of the discharge pipe, it can improve pipe vibration and thus avoid the problem of frequent damage to the high-frequency discharge valve caused by pipe vibration.
[0006] The technical solution of this utility model includes: a discharge pipe for a polypropylene product discharge system, including a pipe body, the pipe body being connected to the outlet of a product blowing tank, and a constraint component being provided on the outside of the pipe body;
[0007] The constraint components include a first constraint component located near the interface between the pipe body and the product blowing can, a second constraint component located near the front side of the pipe body bend, and a third constraint component located near the rear side of the pipe body bend.
[0008] The first constraint component, the second constraint component, and the third constraint component all include an inner connecting frame. The inner connecting frame is sleeved outside the tube body and is in rigid contact with at least part of the outer wall of the tube body. An outer connecting frame is provided on the outside of the inner connecting frame. An elastic element is provided in the gap between the outer connecting frame and the inner connecting frame. Damping shock absorbers are provided on at least two sides of the outer connecting frame.
[0009] The damping of the damping shock absorber of the first constraint assembly is greater than the damping of the damping shock absorber of the second constraint assembly, and the damping of the damping shock absorber of the second constraint assembly is greater than the damping of the damping shock absorber of the third constraint assembly.
[0010] Preferably, the length of the inner connecting frame of the first constraint assembly is greater than the diameter of the pipe body, one side of the inner connecting frame is in contact with the pipe body, and a suspended space exists between the opposite side of the inner connecting frame and the pipe body.
[0011] Preferably, the damping shock absorber of the first constraint assembly has two, one of which is arranged outside the opposite side of the inner connecting frame, and the other is arranged outside the suspended space.
[0012] Preferably, the length of the inner connecting frame of the second constraint assembly and the third constraint assembly is greater than the diameter of the pipe body, one side of the inner connecting frame is in contact with the pipe body, and a suspended space exists between the opposite side of the inner connecting frame and the pipe body.
[0013] Preferably, the damping shock absorber of the third constraint assembly has three, one of which is arranged outside the opposite side of the inner connecting frame, and the other two are arranged outside the part of the inner connecting frame in contact with the pipe body.
[0014] Preferably, the inner connecting frame and the outer connecting frame are spaced apart by a gap, and the elastic member is arranged close to the position where the inner connecting frame is in contact with the pipe body.
[0015] The beneficial effects of the utility model are as follows: constraint assemblies are arranged outside the pipe body of the downcomer, different damping first constraint assemblies, second constraint assemblies and third constraint assemblies are designed according to different positions of the pipe body, the damping of the first constraint assembly close to the pipe body and the product blow-out tank interface is designed to be the maximum, and the damping of the third constraint assembly close to the rear side of the elbow of the pipe body is designed to be the minimum, so as to comprehensively adjust according to the vibration amplitude and vibration speed of the pipe body at different positions, and the inner connecting frame of the constraint assembly is designed to be in rigid contact with at least part of the outer wall of the pipe body, the outer connecting frame is designed outside the inner connecting frame, and the elastic member is arranged in the gap between the inner connecting frame and the outer connecting frame, so that, by means of the damping shock absorbers with different dampings and the inner connecting frame and the outer connecting frame, the constraint on the part with large deformation in the downcomer can be exerted, the pipeline tearing caused by equipment vibration can be eliminated, and the service life of the product blow-out tank high-frequency downcomer valve can be prolonged. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.
[0017] Figure 1 is a schematic view of the installation of the blanking pipeline.
[0018] Figure 2 is a schematic view of the first and second constraint assemblies in the blanking pipeline.
[0019] Figure 3 is a schematic view of the third constraint assembly in the blanking pipeline.
[0020] Wherein:
[0021] 1, the first constraint assembly, 2, the second constraint assembly, 3, the third constraint assembly, 4, the rigid base, 5, the pipe body, 6, the outer connecting frame, 7, the inner connecting frame, 8, the elastic member, 9, the damping shock absorber;
[0022] 100, the product tank, 200, the product blowing tank, 300, the blanking pipeline. DETAILED DESCRIPTION
[0023] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.
[0024] In this paper, the terms such as "up, down, left, right, inside, outside" are established based on the positional relationship shown in the drawings, and according to the different drawings, the corresponding positional relationship may also change accordingly, therefore, it cannot be understood as an absolute limitation on the scope of protection; moreover, the relationship terms such as "first" and "second" are only used to distinguish one part from another part with the same name, and do not necessarily require or imply any such actual relationship or order between the parts. In addition, in the embodiments of the present application, "above", "below" and the like include the number.
[0025] In this embodiment, in the production of gas phase polypropylene, as shown in Figure 1 , the product tank 100 and the product blowing tank 200 of the product discharge system adopt the intermittent blanking mode, and in this process, it is found that due to the intermittent blanking and discharge, the vibration of the tank body of the product blowing tank 200 and the rear blanking pipeline 300 is obvious, especially the vibration at the elbow part of the blanking pipeline 300, and the high-frequency blanking valve of the product blowing tank 200 is damaged frequently.
[0026] The low-frequency forced vibration problems of the product blow-out tank 200 of the product discharge system under different working conditions and different parts of the discharge pipeline 300 of the tank body are analyzed by modal analysis. According to the results of the operational deformation analysis (ODA), if a constraint condition is applied to the part with large deformation, the pipeline tearing problem caused by equipment vibration can be eliminated, and the service life of the high-frequency discharge valve of the product blow-out tank 200 can be prolonged.
[0027] Referring to Figures 1 to 3 The discharge pipeline 300 of the polypropylene product discharge system of the embodiment comprises a pipe body 5 connected with the outlet of the product blow-out tank 200, and a constraint assembly is arranged on the outer side of the pipe body 5. Specifically, the constraint assembly comprises a first constraint assembly 1 arranged near the interface of the pipe body 5 with the product blow-out tank 200, a second constraint assembly 2 arranged near the front side of the elbow of the pipe body 5, and a third constraint assembly 5 arranged near the rear side of the elbow of the pipe body 5. Among them, the front side of the elbow of the pipe body 5 refers to the front of the elbow position of the pipe body 5, that is, the polypropylene powder has not reached the elbow position, and the rear side of the elbow of the pipe body 5 refers to the position behind the elbow position of the pipe body 5, that is, the position after the polypropylene powder has passed through the elbow position.
[0028] The first constraint assembly 1, the second constraint assembly 2 and the third constraint assembly 3 each comprise an inner connecting frame 7 which is sleeved on the outer side of the pipe body 5 and rigidly contacts with the outer wall of at least part of the pipe body 5. An outer connecting frame 6 is arranged on the outer side of the inner connecting frame 7, and an elastic member 8 is arranged in the gap between the outer connecting frame 6 and the inner connecting frame 7. A damping shock absorber 9 is arranged on at least two sides of the outer connecting frame 6. Considering that the vibrations of different parts of the pipe body 5 are different, the damping of the damping shock absorber 9 of the first constraint assembly 1 is designed to be greater than the damping of the damping shock absorber 9 of the second constraint assembly 2, and the damping of the damping shock absorber 9 of the second constraint assembly 2 is designed to be greater than the damping of the damping shock absorber 9 of the third constraint assembly 3. In this way, by designing the constraint assembly at different parts of the pipe body 5 of the discharge pipeline 300 and designing the constraint assembly in the form of a combination of a connecting frame and a damping shock absorber, the impedance of the entire product discharge system can be improved, the initial displacement when subjected to the impact of discharging can be ensured not to be too large, the contact state of the inner connecting frame 7 and the outer connecting frame 6 is ensured not to be subjected to secondary impact, the non-linear shock absorber has low stiffness at small displacement to ensure stress release at small displacement, has high stiffness at large displacement to limit large displacement to excessive stress on other constraints, and the damping shock absorber 9 can quickly attenuate the oscillation after impact. In this way, by increasing the damping shock absorber 9 and the pipe support formed by the inner connecting frame 7 and the outer connecting frame 6, the vibration problem of the discharge pipeline 300 can be effectively improved. After the discharge pipeline 300 uses the pipe support combination and orientation arrangement of the embodiment, the service life of the high-frequency discharge valve is greatly prolonged.
[0029] In this embodiment, the length of the inner connecting frame 7 of the first constraint assembly 1 is greater than the diameter of the pipe body 5, so that one side of the inner connecting frame 7 is in contact with the pipe body 5, and there is a suspended space between the opposite side of the inner connecting frame 7 and the pipe body 5, i.e. there is a part of the inner connecting frame 7 extending outside the pipe body 5 in the length direction of the inner connecting frame 7. Similarly, the length of the inner connecting frame 7 of the second constraint assembly 2 and the third constraint assembly 3 is also designed to be greater than the diameter of the pipe body 5, so that in the second constraint assembly 2 and the third constraint assembly 3, one side of the inner connecting frame 7 is in contact with the pipe body 5, and there is a suspended space between the opposite side of the inner connecting frame 7 and the pipe body 5.
[0030] Referring to Figure 2 , the damping shock absorber 9 of the first constraint assembly 1 has two, one of which is arranged outside the opposite side of the inner connecting frame 7, and the other is arranged outside the suspended space. Similarly, the damping shock absorber 9 of the second constraint assembly 1 also has two, one of which is arranged outside the opposite side of the inner connecting frame 7, and the other is arranged outside the suspended space. Different from the above, as shown in Figure 3 , the damping shock absorber 9 of the third constraint assembly 3 has three, one of which is arranged outside the opposite side of the inner connecting frame 7, and the other two are arranged outside the part of the inner connecting frame 7 in contact with the pipe body 5. Specifically, the damping shock absorber 9 is connected with the rigid base 4 for installing the damping shock absorber 9, and as for the specific type of the damping shock absorber 9, a common one on the market can be selected.
[0031] The elastic member 8 is arranged in the gap between the inner connecting frame 7 and the outer connecting frame 6, which can be selected from springs, rubbers and other members with elastic deformation, and the elastic member is arranged close to the position where the inner connecting frame 7 is in contact with the pipe body 5.
[0032] The discharging pipeline 300 of the polypropylene product discharging system of the embodiment can effectively control the vibration speed and vibration amplitude of the pipe body 5, specifically, the vibration speed of the pipe body 5 near the interface with the product blowing tank 200 can be controlled to be 0.1-2.5 mm / s, and the vibration amplitude is controlled to be 0.1 mm, the vibration speed of the elbow of the pipe body 5 can be controlled to be 0.08-2.5 mm / s, and the vibration amplitude is controlled to be 0.1 mm. Compared with before the embodiment is adopted, the vibration speed of the pipe body 5 near the interface with the product blowing tank 200 is 2.5-25 mm / s, and the vibration amplitude is 1-3 mm, the vibration speed of the elbow of the pipe body 5 is 2.4-13 mm / s, and the vibration amplitude is 2-5 mm. Compared with before the discharging pipeline 300 of the embodiment is adopted, the embodiment can eliminate the axial vibration of the pipe body 5, and can reduce the vibration amplitude of the discharging valve at the bottom of the product blowing tank 200 from 50 mm to 20 mm. Thus, in the embodiment, by improving the vibration of the discharging pipeline 300, the equipment component damage or falling problem caused by vibration can be avoided, such as the valve air source pipe falling of the product discharging system, the damper connection thread loosening and falling, etc., and because the vibration amplitude can be reduced, the valve component falling and breaking problem can also be avoided, and the valve failure rate is reduced.
[0033] In the case of not contradicting each embodiment, at least part of the technical solutions in each embodiment can be recombined to form the essential technical solutions of the utility model, and each embodiment can also be mutually quoted or contained.
[0034] The technical principle of the utility model is described above in combination with the specific embodiments, but it should be noted that the above description is only for explaining the principle of the utility model, and cannot be interpreted as a specific limitation on the protection scope of the utility model in any way. Based on the explanation here, other specific embodiments or equivalent replacements of the utility model that can be thought of by those skilled in the art without creative labor will fall within the protection scope of the utility model.
Claims
1. A discharge duct of a polypropylene product discharge system, comprising a duct body (5) connected to an outlet of a product blow tank (200), characterized in that: The outer side of the pipe body (5) is provided with a constraint assembly; The constraint assembly comprises a first constraint assembly (1) provided near the interface of the pipe body (5) with the product blowing tank (200), a second constraint assembly (2) provided near the front side of the elbow of the pipe body (5), and a third constraint assembly (3) provided near the rear side of the elbow of the pipe body (5); The first constraint assembly (1), the second constraint assembly (2), and the third constraint assembly (3) all comprise an inner connecting frame (7) which is sleeved on the outer side of the pipe body (5) and rigidly contacts the outer wall of at least part of the pipe body (5), the outer side of the inner connecting frame (7) is provided with an outer connecting frame (6), the gap between the outer connecting frame (6) and the inner connecting frame (7) is provided with an elastic member (8), and at least two side surfaces of the outer connecting frame (6) are provided with damping shock absorbers (9). The damping of the damping shock absorber (9) of the first constraint assembly (1) is greater than the damping of the damping shock absorber (9) of the second constraint assembly (2), and the damping of the damping shock absorber (9) of the second constraint assembly (2) is greater than the damping of the damping shock absorber (9) of the third constraint assembly (3).
2. A downer pipe of a polypropylene product discharge system according to claim 1, characterized in that: The length of the inner connecting frame (7) of the first constraint assembly (1) is greater than the diameter of the pipe body (5), one side surface of the inner connecting frame (7) contacts the pipe body (5), and there is a suspended space between the opposite side surface of the inner connecting frame (7) and the pipe body (5).
3. A downer pipe of a polypropylene product discharge system according to claim 2, characterized in that: The damping shock absorber (9) of the first constraint assembly (1) has two, one of which is provided on the outer side of the opposite side surface of the inner connecting frame (7), and the other is provided on the outer side of the suspended space.
4. A discharge conduit for a polypropylene product discharge system as claimed in claim 1 or 2, characterised in that: The length of the inner connecting frame (7) of the second constraint assembly (2) and the third constraint assembly (3) is greater than the diameter of the pipe body (5), one side surface of the inner connecting frame (7) contacts the pipe body (5), and there is a suspended space between the opposite side surface of the inner connecting frame (7) and the pipe body (5).
5. A downer pipe of a polypropylene product discharge system according to claim 4, characterized in that: The damping shock absorber (9) of the third constraint assembly (3) has three, one of which is provided on the outer side of the opposite side surface of the inner connecting frame (7), and the other two are provided on the outer side of the part of the inner connecting frame (7) contacting the pipe body (5).
6. A downer pipe for a polypropylene product discharge system as claimed in claim 1, characterized in that: The elastic member (8) is arranged in the gap between the inner connecting frame (7) and the outer connecting frame (6), and is located near the position where the inner connecting frame (7) contacts the pipe body (5).