Mechanical seal cleaning mechanism of mixed binary acid distillation tower circulating pump
By designing the distillation tower reflux pipeline and the mechanical seal cleaning mechanism of the reflux pump in the mixed dibasic acid distillation tower circulation pump, the carbon particles are blocked from entering and forming a liquid film, which solves the problem of wear on the sealing surface of the circulation pump and extends the mechanical sealing. Service life and reduce maintenance costs.
Patent Information
- Application Number
- CN202420184888.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-25
- Publication Date
- 2024-12-06
- Estimated Expiration
- 2034-01-25
AI Technical Summary
In chemical enterprises, the mechanical seal of the circulating pump of the mixed dibasic acid distillation tower is worn and corroded due to the carbon particles entering the gap between the static and dynamic rings, which frequently damages the equipment, affecting the separation and purification of raw materials. How to extend the service life of the mechanical seal is a Problems that need to be solved urgently.
A mechanical seal cleaning mechanism including a distillation tower reflow pipeline and a reflow pump is designed to block particulate matter from entering the gap between the static ring and the moving ring through the reflux liquid without solid impurities, forming a liquid film, avoiding dry grinding, and matching through threads and flexible/rigid pipe arrangement improves sealing performance and convenience.
It effectively extends the service life of mechanical seals, prevents wear of static and dynamic rings, keeps the liquid film updated, reduces the influence of heat, and ensures sealing performance and equipment stability.
Smart Images
Figure CN222121889U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of chemical industry, in particular to a mechanical seal cleaning mechanism of a circulating pump of a mixed dibasic acid distillation tower. Background Art
[0002] When chemical companies use mixed dibasic acids as raw materials, they need to use distillation towers to separate and purify them before use.
[0003] When using a distillation tower to separate and purify mixed dibasic acids, the heavy components at the bottom of the distillation tower circulate between the bottom of the tower and the reboiler. Since the mixed dibasic acids contain carbon particles, these carbon particles enter the gap between the dynamic ring and the static ring of the mechanical seal of the reboiler circulating pump during the circulation process, causing wear and corrosion on the sealing surface, which in turn causes materials to enter the bearing chamber, frequently damaging the equipment and seriously affecting the separation and purification of the raw materials.
[0004] Therefore, how to effectively extend the service life of the mechanical seal of the reboiler circulation pump is an urgent problem to be solved by those skilled in the art. Summary of the invention
[0005] The purpose of the utility model is to provide a mechanical seal cleaning mechanism for a circulating pump of a mixed dibasic acid distillation tower in view of the deficiencies in the prior art. The mechanism has a simple structure and low maintenance cost. The mechanism utilizes separated reflux liquid that does not contain solid impurities to block the entry of particulate matter, thereby reducing the wear of the sealing surface between the static ring and the dynamic ring of the mechanical seal, and effectively extending the service life of the mechanical seal.
[0006] The technical solution of the utility model is: a mechanical seal cleaning mechanism of a circulating pump of a mixed dibasic acid distillation tower, comprising a reflux pipeline of the distillation tower, a reflux pump is arranged on the reflux pipeline of the distillation tower, a cleaning liquid inlet is arranged on the static ring of the mechanical seal of the circulating pump, and is communicated with the gap between the static ring and the dynamic ring, the cleaning liquid inlet is connected to the reflux pipeline of the distillation tower through the cleaning pipeline, and is located downstream of the reflux pump, and a first valve is arranged on the cleaning pipeline.
[0007] The number of the cleaning liquid inlets is one or more, and when there are multiple inlets, they are evenly distributed along the circumference of the static ring.
[0008] A threaded section is arranged on the inner wall of the cleaning liquid inlet, and the cleaning pipeline is detachably connected to the cleaning liquid inlet of the stationary ring through threaded fitting.
[0009] The first valve is a regulating valve.
[0010] The cleaning pipeline is a flexible pipeline and / or a rigid pipeline.
[0011] The above technical solution has the following beneficial effects:
[0012] 1. The mechanical seal cleaning mechanism of the circulating pump of the mixed dibasic acid distillation tower includes a distillation tower reflux pipeline, on which a reflux pump is arranged. The dibasic acid vapor phase separated from the top of the distillation tower is partially extracted after condensation, and partially refluxed to the top of the distillation tower through the distillation tower reflux pipeline to improve the purity of the separated vapor phase. A cleaning liquid inlet is arranged on the static ring of the mechanical seal of the circulating pump, which is connected to the gap between the static ring and the dynamic ring. Obviously, the gap between the static ring and the dynamic ring is connected to the inner cavity of the circulating pump, so that a liquid film is formed in the gap between the dynamic ring and the static ring, thereby avoiding dry grinding between the static ring and the dynamic ring and ensuring the service life of the static ring and the dynamic ring. The cleaning liquid inlet is connected to the distillation tower reflux pipeline through a cleaning pipeline and is located downstream of the reflux pump. A first valve is arranged on the cleaning pipeline. The reflux liquid without solid impurities enters the gap between the static ring and the dynamic ring through the cleaning pipeline and the cleaning liquid inlet to form a liquid film, and prevents the heavy components (containing carbon particles) at the bottom of the distillation tower in the circulating pump from entering the gap between the static ring and the dynamic ring, thereby ensuring the service life of the static ring and the dynamic ring. In addition, the liquid film is kept in a state of continuous renewal, thereby reducing the heat of the static ring and the dynamic ring, thereby ensuring the service life of the static ring and the dynamic ring.
[0013] 2. A threaded section is provided on the inner wall of the cleaning liquid inlet, and the cleaning pipeline is detachably connected to the cleaning liquid inlet of the static ring through threaded fitting, which is convenient for installation and disassembly, and can also improve the sealing performance between the cleaning pipeline and the static ring and reduce the risk of leakage.
[0014] 3. The cleaning pipeline is a flexible pipeline and / or a rigid pipeline, which is conducive to the layout of the pipeline.
[0015] Further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a connection diagram of the utility model;
[0017] Figure 2 It is a connection diagram of the cleaning pipeline and the static ring of the utility model.
[0018] In the attached drawings, 1 is the reflux pipeline of the distillation tower, 2 is the reflux pump, 3 is the static ring, 4 is the cleaning liquid inlet, 5 is the dynamic ring, 6 is the cleaning pipeline, and 7 is the first valve. DETAILED DESCRIPTION
[0019] See also Figure 1 and Figure 2, is a specific embodiment of a mechanical seal cleaning mechanism of a circulating pump of a mixed dibasic acid distillation tower. The mechanical seal cleaning mechanism of the circulating pump of the mixed dibasic acid distillation tower comprises a distillation tower reflux pipeline 1, and a reflux pump 2 is arranged on the distillation tower reflux pipeline 1. A cleaning liquid inlet 4 is arranged on the static ring 3 of the mechanical seal of the circulating pump, and is communicated with the gap between the static ring 3 and the dynamic ring 5. The number of the cleaning liquid inlets is one or more. When the number is multiple, they are evenly distributed along the circumference of the static ring 3. Usually, a threaded section is arranged on the inner wall of the cleaning liquid inlet. The cleaning liquid inlet 4 is connected to the distillation tower reflux pipeline 1 through a cleaning pipeline 6, and is located downstream of the reflux pump 2. In order to ensure the sealing performance between the cleaning pipeline and the cleaning liquid inlet, the cleaning pipeline is detachably connected to the cleaning liquid inlet of the static ring through threaded matching. In addition, the cleaning pipeline is usually composed of a combination of a flexible pipeline and a rigid pipeline. The pipe section connected to the static ring and the distillation tower reflux pipeline adopts a rigid pipeline, and the rigid pipelines are connected by a flexible pipeline. In this way, the stability of the connection can be ensured, and the cleaning pipeline is conveniently arranged to meet the actual needs of the enterprise. The cleaning pipeline 6 is provided with a first valve 7 , and usually, the first valve is a regulating valve.
[0020] The working principle of the utility model is as follows: the distillation tower operates normally, the vapor phase is discharged from the tower top, and after being condensed into a liquid phase by the tower top condenser, part of it is extracted, and part of it is refluxed to the top of the distillation tower through the reflux pipeline of the distillation tower, and the heavy components at the bottom of the distillation tower circulate through the circulation pump and the reboiler, and by controlling the opening of the first valve, part of the reflux liquid that does not contain solid impurities enters the gap between the static ring and the dynamic ring of the mechanical seal of the circulation pump through the cleaning pipeline and the cleaning liquid inlet to form a liquid film, thereby ensuring the normal operation of the mechanical seal, and the liquid film is continuously renewed, and the old liquid film enters the inner cavity of the circulation pump and returns to the distillation tower with the heavy components.
Claims
1. A mechanical seal cleaning mechanism for a circulating pump of a mixed dibasic acid distillation tower, comprising a distillation tower reflux pipeline (1), a reflux pump (2) being arranged on the distillation tower reflux pipeline (1), characterized in that: A cleaning liquid inlet (4) is provided on the stationary ring (3) of the mechanical seal of the circulation pump and is communicated with the gap between the stationary ring (3) and the dynamic ring (5). The cleaning liquid inlet (4) is connected to the reflux pipeline (1) of the distillation tower through a cleaning pipeline (6) and is located downstream of the reflux pump (2). A first valve (7) is provided on the cleaning pipeline (6).
2. The mechanical seal cleaning mechanism of the circulating pump of the mixed dibasic acid distillation tower according to claim 1, characterized in that: The number of the cleaning liquid inlet (4) is one or more, and when there are more than one, they are evenly distributed along the circumference of the stationary ring (3).
3. The mechanical seal cleaning mechanism of the circulating pump of the mixed dibasic acid distillation tower according to claim 1, characterized in that: A threaded section is provided on the inner wall of the cleaning liquid inlet (4), and the cleaning pipeline (6) is detachably connected to the cleaning liquid inlet (4) of the stationary ring through threaded engagement.
4. The mechanical seal cleaning mechanism of the circulating pump of the mixed dibasic acid distillation tower according to claim 1, characterized in that: The first valve (7) is a regulating valve.
5. The mechanical seal cleaning mechanism of the circulating pump of the mixed dibasic acid distillation tower according to claim 1, characterized in that: The cleaning pipeline (6) is a flexible pipeline and / or a rigid pipeline.