Vibration reduction system for vacuum evaporator of ethylene glycol device
By installing a damper on the feed pipe of the vacuum evaporator of the ethylene glycol device, the variable diameter reduces the pressure and absorbs kinetic energy, the safety hazards caused by vibration of the last stage evaporator are solved, and the safe and stable operation of the device and the extended equipment life are achieved.
Patent Information
- Application Number
- CN202422392999.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-30
AI Technical Summary
In the ethylene glycol production device, the two-phase flow of the vapor and liquid in the final stage evaporator causes a large vibration amplitude of the pipeline, and the circulation of the reboiler is insufficient under low load conditions, which affects the safety and stability of the system, may lead to pipeline cracks and equipment failures, and shortens the service life of the device, pipeline and valves.
A damper is installed on the feed pipe of the vacuum evaporator of the ethylene glycol device. The flushing of the variable diameter is reduced and part of the kinetic energy is absorbed to reduce vibration. The damper limit and vibration are used to improve the stability of the system.
Effectively prevent pipeline fatigue cracks, extend the service life of devices, pipelines and valves, and improve operational safety and stability.
Smart Images
Figure CN223158855U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ethylene glycol devices, and particularly to a vibration damping system for a vacuum evaporator of an ethylene glycol device. Background Technique
[0002] Ethylene glycol, also known as glycol, 1,2-ethylene glycol, abbreviated as EG, is the simplest diol. Ethylene glycol is a colorless, odorless, sweet liquid with low toxicity to animals. Ethylene glycol can be miscible with water and acetone, but has a relatively low solubility in ethers. It is mainly used in the production of polyester, polyester fiber, polyester resin, hygroscopic agent, plasticizer, surfactant, synthetic fiber, cosmetics and explosives. It can also be used as a solvent for dyes, inks, etc., as an antifreeze for engines, a gas dehydrating agent, and for manufacturing resins.
[0003] Generally, the production device of ethylene glycol includes multiple-stage evaporators. Among them, the last-stage seven-effect evaporator is a vacuum evaporator. Two reboilers are respectively connected to the bottom of the seven-effect evaporator. The kettle liquid of the upstream six-effect evaporator converges at the tube-side inlet at the bottom of the reboiler through a pipeline and a flow regulating valve. The pipeline diameter changes at the convergence position to reduce pressure and flash vaporize. However, there is a gas-liquid two-phase flow during the flash vaporization process, and the reboiler circulation volume cannot be satisfied under low-load conditions, resulting in a relatively large vibration amplitude of the pipelines in the whole system. Long-term vibration affects the safe operation of the pipelines and related equipment, and may even cause pipeline cracks and equipment failures, posing a relatively large safety hazard, reducing the stability of the system operation, and shortening the service life of the device, pipeline and valve. Content of the Utility Model
[0004] In view of the defects of the prior art, the utility model provides a vibration damping system for a vacuum evaporator of an ethylene glycol device, which plays a role in limiting and damping the feed pipeline of the last-stage evaporator, that is, the vacuum evaporator of the ethylene glycol device, thereby improving the safety and stability of the device operation, preventing pipeline fatigue cracks, and prolonging the service life of the device, pipeline and valve.
[0005] To achieve the above object, the technical solution provided by the present utility model is a vibration damping system for a vacuum evaporator in an ethylene glycol unit, which includes a secondary evaporator, a first reboiler, a second reboiler, a final evaporator, a first damper, and a second damper; the bottom of the secondary evaporator is connected to a main feed pipeline, the main feed pipeline is respectively connected to a first branch pipeline and a second branch pipeline, the first branch pipeline includes a first small-diameter pipe section connected to the main feed pipeline, a first liquid control valve connected to the first small-diameter pipe section, and a first large-diameter pipe section connected to the first liquid control valve, the second branch pipeline includes a second small-diameter pipe section connected to the main feed pipeline, a second liquid control valve connected to the second small-diameter pipe section, and a second large-diameter pipe section connected to the second liquid control valve; the bottom tube-side inlet of the first reboiler is connected to the first large-diameter pipe section; the bottom tube-side inlet of the second reboiler is connected to the second large-diameter pipe section; the bottom of the final evaporator is respectively connected to the first large-diameter pipe section and the second large-diameter pipe section; the first damper is installed on the first branch pipeline; the second damper is installed on the second branch pipeline.
[0006] Further, the first damper is installed on the first small-diameter pipe section upstream of the first liquid control valve.
[0007] Further, the second damper is installed on the second small-diameter pipe section upstream of the second liquid control valve.
[0008] Further, the first damper and the second damper have the same structure, the first damper includes a fixed component connected to a fixed position on the periphery of the vibration damping system, and two half rings connected to the fixed component, and the two half rings are detachably butted and fixed to limit the first branch pipeline between the two half rings.
[0009] Further, the first branch pipeline and the second branch pipeline meet at the same point on the main feed pipeline.
[0010] Further, the vibration damping system further includes a third damper, and the third damper is installed on the main feed pipeline.
[0011] Further, the third damper is arranged close to the meeting point of the first branch pipeline and the second branch pipeline on the main feed pipeline.
[0012] Further, the third damper has the same structure as the first damper.
[0013] Further, a liquid level gauge is arranged inside the final evaporator, and the liquid level gauge is electrically connected to the first liquid control valve and the second liquid control valve respectively.
[0014] Further, the diameter of the first large-diameter pipe section is 4-5 times the diameter of the first small-diameter pipe section; the diameter of the second large-diameter pipe section is 4-5 times the diameter of the second small-diameter pipe section.
[0015] Advantages of the present utility model: The first damper and the second damper are provided to limit and damp the feed pipeline of the final-stage evaporator. The damper absorbs part of the kinetic energy, thereby improving the safety and stability of the device operation, preventing the occurrence of pipeline fatigue cracks, and prolonging the service life of the device, pipeline and valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a process flow diagram of a vibration damping system for a vacuum evaporator in an ethylene glycol device in an embodiment of the present utility model;
[0017] Figure 2 is a schematic structural diagram of a first damper in an embodiment of the present utility model;
[0018] Figure 3 is a side view of the first damper in an embodiment of the present utility model;
[0019] Figure 4 is a schematic structural diagram of the first damper in another embodiment of the present utility model;
[0020] Figure 5 is a usage state diagram of the first damper in another embodiment of the present utility model;
[0021] In the figure:
[0022] 100, secondary evaporator, 110, main feed pipeline, 120, first branch pipeline, 121, first small-diameter pipe section, 122, first liquid control valve, 123, first large-diameter pipe section, 130, second branch pipeline, 131, second small-diameter pipe section, 132, second liquid control valve, 133, second large-diameter pipe section,
[0023] 200, first reboiler,
[0024] 300, second reboiler,
[0025] 400, final-stage evaporator,
[0026] 500, first damper, 510, fixing component, 520, 530, half rings, 540, first half ring, 550, second half ring,
[0027] 600, second damper,
[0028] 700, third damper,
[0029] 10, fixing position. Detailed implementation manners
[0030] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will describe in detail the specific implementation manners of the present utility model with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.
[0031] See Figure 1 , which shows a process flow diagram of a vibration damping system for a vacuum evaporator in an ethylene glycol plant according to an embodiment of the present utility model. It includes a secondary evaporator 100, a first reboiler 200, a second reboiler 300, a final evaporator 400, a first damper 500, and a second damper 600. The bottom of the secondary evaporator 100 is connected to a main feed pipeline 110. The main feed pipeline 110 is respectively connected to a first branch pipeline 120 and a second branch pipeline 130. The first branch pipeline 120 includes a first small-diameter pipe section 121 connected to the main feed pipeline 110, a first liquid control valve 122 connected to the first small-diameter pipe section 121, and a first large-diameter pipe section 123 connected to the first liquid control valve 122. The second branch pipeline 130 includes a second small-diameter pipe section 131 connected to the main feed pipeline 110, a second liquid control valve 132 connected to the second small-diameter pipe section 131, and a second large-diameter pipe section 133 connected to the second liquid control valve 132. The bottom tube-side inlet of the first reboiler 200 is connected to the first large-diameter pipe section 123. The bottom tube-side inlet of the second reboiler 300 is connected to the second large-diameter pipe section 133. The bottom of the final evaporator 400 is respectively connected to the first large-diameter pipe section 123 and the second large-diameter pipe section 133. The first damper 500 is installed in the first branch pipeline 120. The second damper 600 is installed in the second branch pipeline 130.
[0032] On the branch pipeline of the above vibration damping system for a vacuum evaporator in an ethylene glycol plant, the pipe diameter after the liquid control valve changes from a smaller one to a larger one to facilitate pressure reduction and flashing. And by identifying the cause and source location of the vibration in the system, dampers are added to the feed pipeline of the final evaporator 400. The dampers absorb part of the kinetic energy. Specifically, the first damper 500 and the second damper 600 are respectively installed in front of the first liquid control valve 122 and in front of the second liquid control valve 132. During the process of the pressure dropping from 100 Kpa to -85 Kpa vacuum state, the first damper 500 and the second damper 600 play a role in absorbing part of the kinetic energy, limiting the position, and damping the vibration of the feed pipeline of the final evaporator 400, thereby ensuring the safe and stable operation of the device and preventing the occurrence of pipeline fatigue cracks to a certain extent.
[0033] Preferably, in one embodiment, the diameter of the first large-diameter pipe section is 4-5 times the diameter of the first small-diameter pipe section; the diameter of the second large-diameter pipe section is 4-5 times the diameter of the second small-diameter pipe section, which is beneficial to variable-diameter pressure-reducing flashing. As an example, in this embodiment, the first small-diameter pipe section 121 and the second small-diameter pipe section 131 are pipes with a diameter of 8 inches, and the first large-diameter pipe section 123 and the second large-diameter pipe section 133 are pipes with a diameter of 36 inches.
[0034] In one embodiment, the first damper 500 is installed on the first small-diameter pipe section 121 upstream of the first liquid-controlled valve 122.
[0035] In one embodiment, the second damper 600 is installed on the second small-diameter pipe section 131 upstream of the second liquid-controlled valve 132.
[0036] See Figure 2 and Figure 3 , in one embodiment, the first damper 500 and the second damper 600 have the same structure. The first damper 500 includes a fixing component 510 connected to a fixed position 10 on the periphery of the vibration damping system, two half-rings 520, 530 connected to the fixing component 510, and the two half-rings 520, 530 are detachably butted and fixed to limit the first branch pipe 120 between the two half-rings 520, 530.
[0037] See Figure 4 and Figure 5 , in another embodiment, the first damper 500 and the second damper 600 have the same structure. The first damper 500 includes a fixing component 510 connected to a fixed position 10 on the periphery of the vibration damping system, a first half-ring 540 connected to the fixing component 510, and a second half-ring 550 hinged to one end of the first half-ring 540. The other end of the first half-ring 540 is detachably connected to one end of the second half-ring 550 to form an annular structure for passing through the first branch pipe 120. During installation, the fixing component 510 is fixed to the fixed position 10 on the periphery of the vibration damping system, the first branch pipe 120 is limited inside the first half-ring 540, and the second half-ring 550 is rotated and the first half-ring 540 is fixed to the second half-ring 550. The advantage of this embodiment is that the first half-ring 540 and the second half-ring 550 are always connected, which is convenient for storage and handling, and can reduce the phenomenon of spare parts loss to a certain extent.
[0038] In one embodiment, the first branch pipe 120 and the second branch pipe 130 meet at the same point on the feed main pipe 110.
[0039] In one embodiment, the vibration damping system further includes a third damper 700, and the third damper 700 is installed on the feed main pipe 110.
[0040] In one embodiment, the third damper 700 is disposed near the meeting point of the first branch pipe 120 and the second branch pipe 130 on the main feed pipe 110.
[0041] In one embodiment, the third damper 700 has the same structure as the first damper 500.
[0042] In one embodiment, a liquid level gauge is disposed inside the kettle of the final-stage evaporator 400, and the liquid level gauge is electrically connected to the first liquid control valve 122 and the second liquid control valve 132 respectively.
[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.
[0044] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.
[0045] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0046] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature. It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.
Claims
1. A vibration damping system for a vacuum evaporator in an ethylene glycol plant, characterized in that: including a secondary evaporator, with a main feed pipeline connected to the bottom of the kettle. The main feed pipeline is respectively connected to a first branch pipeline and a second branch pipeline. The first branch pipeline includes a first small-diameter pipe section connected to the main feed pipeline, a first liquid control valve connected to the first small-diameter pipe section, and a first large-diameter pipe section connected to the first liquid control valve. The second branch pipeline includes a second small-diameter pipe section connected to the main feed pipeline, a second liquid control valve connected to the second small-diameter pipe section, and a second large-diameter pipe section connected to the second liquid control valve; a first reboiler, with the inlet of the bottom tube pass connected to the first large-diameter pipe section; a second reboiler, with the inlet of the bottom tube pass connected to the second large-diameter pipe section; a final-stage evaporator, with the bottom of the kettle respectively connected to the first large-diameter pipe section and the second large-diameter pipe section; a first damper, installed on the first branch pipeline; a second damper, installed on the second branch pipeline.
2. The vibration damping system for a vacuum evaporator of an ethylene glycol plant according to claim 1, wherein: The first damper is installed on the first small-diameter pipe section upstream of the first liquid control valve.
3. A vibration damping system for a vacuum evaporator of an ethylene glycol plant according to claim 1, characterized in that: The second damper is installed on the second small-diameter pipe section upstream of the second liquid control valve.
4. A vibration damping system for a vacuum evaporator of an ethylene glycol plant according to any one of claims 1-3, characterized in that: The first damper and the second damper have the same structure. The first damper includes a fixed component connected to a fixed position on the periphery of the vibration damping system, and two half rings connected to the fixed component. The two half rings are detachably butted and fixed to limit the first branch pipeline between the two half rings.
5. A vibration damping system for a vacuum evaporator of an ethylene glycol plant according to claim 4, characterized in that: The first branch pipeline and the second branch pipeline meet at the same point on the main feed pipeline.
6. The vibration damping system for a vacuum evaporator of an ethylene glycol plant according to claim 5, characterized in that: The vibration damping system further includes a third damper, which is installed on the main feed pipeline.
7. A vibration damping system for a vacuum evaporator in an ethylene glycol plant according to claim 6, characterized in that: The third damper is arranged near the meeting point of the first branch pipeline and the second branch pipeline on the main feed pipeline.
8. A vibration damping system for a vacuum evaporator of an ethylene glycol unit according to claim 6, characterized in that: The third damper has the same structure as the first damper.
9. A vibration damping system for a vacuum evaporator of an ethylene glycol plant according to any one of claims 1-3, characterized in that: A liquid level gauge is arranged inside the kettle of the final-stage evaporator, and the liquid level gauge is electrically connected to the first liquid control valve and the second liquid control valve respectively.
10. A vibration damping system for a vacuum evaporator of an ethylene glycol unit according to any one of claims 1-3, characterized in that: The diameter of the first large-diameter pipe section is 4-5 times the diameter of the first small-diameter pipe section; the diameter of the second large-diameter pipe section is 4-5 times the diameter of the second small-diameter pipe section.