A slag discharging device of a vacuum liquid seal system

Abstract

The utility model belongs to the technical field of the slag salvaging in the polyester generation, specifically relates to a kind of slag discharging device of vacuum liquid seal system, including ethylene glycol liquid seal groove;Residue collection tank is connected by pipeline with the ethylene glycol liquid seal groove;First valve is equipped on the pipeline;Drain line, the residue collection tank is connected with ethylene glycol liquid seal groove, and is equipped with drain valve;Vacuum pipeline is connected with the residue collection tank, and second valve and vacuum gauge are equipped on the vacuum pipeline, for building vacuum environment to suck residue;Nitrogen input end is connected on the vacuum pipeline;Vacuum pump is cooperated with the vacuum pipeline, for extracting vacuum;Motor is connected with the vacuum pump, provides power for it.The utility model does not need manual direct entry liquid seal groove to salvage slag, and only through the cooperation of valve control and vacuum, nitrogen can realize the automatic collection and cleaning of residue, effectively reduces artificial workload and operation risk.

Description

Technical Field

[0001] This utility model belongs to the field of slag removal technology in polyester production, and specifically relates to a slag discharge device for a vacuum liquid seal system. Background Technology

[0002] In the production of polyester and other chemicals, the ethylene glycol liquid seal tank is a key piece of equipment for maintaining system vacuum and achieving gas-liquid separation. With the long-term operation of the polyester plant, during the polycondensation stage, the oligomers in the system are drawn into the condensation system as the vacuum system is continuously evacuated. During the ethylene glycol circulation process, the oligomers drawn out by the vacuum are carried to the liquid seal tank. If the residue accumulates for a long time, it will block the atmospheric leg pipeline of the liquid seal tank, resulting in a decrease in system vacuum, unstable production pressure, and even shutdown for cleaning, which seriously affects the continuity of production and product quality.

[0003] Currently, the industry primarily uses manual methods to clean residue from ethylene glycol liquid seal tanks: the relevant production unit must be stopped, the manhole of the liquid seal tank opened, and workers use tools to directly remove the residue. This method has significant drawbacks: first, it involves high labor intensity and a harsh operating environment (the tank may contain residual toxic gases or high-temperature media), posing high safety risks; second, the cleaning cycle is long, and frequent shutdowns lead to reduced production efficiency and increased energy consumption; third, incomplete cleaning can easily cause pipeline blockages again due to residual residue, and manual operation can lead to ethylene glycol waste and environmental pollution.

[0004] In addition, some improvement solutions attempt to clean the residue by mechanical stirring or high-pressure flushing, but these methods are prone to disrupting the vacuum environment inside the liquid seal tank and may cause the residue to be broken up, making it easier to clog small pipelines. Therefore, they cannot fundamentally solve the problem of residue collection and cleaning. Utility Model Content

[0005] In view of the above-mentioned shortcomings in the existing technology, the present invention provides a slag discharge device for a vacuum liquid seal system to solve the problems in the background technology.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A slag removal device for a vacuum liquid seal system includes: an ethylene glycol liquid seal tank; a residue collection tank connected to the ethylene glycol liquid seal tank via a pipeline; a first valve on the pipeline; a drain pipeline connecting the residue collection tank and the ethylene glycol liquid seal tank, and equipped with a drain valve; a vacuum pipeline connected to the residue collection tank, and equipped with a second valve and a vacuum gauge for creating a vacuum environment to remove residue; a nitrogen input terminal connected to the vacuum pipeline; a vacuum pump cooperating with the vacuum pipeline for creating a vacuum; and a motor connected to the vacuum pump to provide power.

[0008] Furthermore, the residue collection tank is installed at a height slightly higher than the ethylene glycol liquid seal tank, and the connecting pipeline between the two is controlled by a first valve, which connects to the atmospheric leg side of the ethylene glycol liquid seal tank.

[0009] Furthermore, a vacuum pipeline is connected to a vacuum pump, and by controlling the second valve in conjunction with the vacuum level displayed by the vacuum gauge, the residue in the ethylene glycol liquid seal tank can be sucked up.

[0010] Furthermore, the nitrogen input end introduces nitrogen into the vacuum pipeline and the residue collection tank to break the vacuum, making it easier to open the residue collection tank for slag removal.

[0011] Furthermore, the drain line connects the bottom of the residue collection tank to the ethylene glycol liquid seal tank. Closing the drain valve allows for vacuuming, while opening the drain valve allows the liquid in the residue collection tank to flow back into the ethylene glycol liquid seal tank.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] 1. Significantly reduces manual operation. The automated transfer of residue is achieved through vacuum suction and valve control, eliminating the need for manual entry into the liquid seal tank to remove residue. This reduces the labor intensity of workers and avoids production accidents that may occur when manually using tools to remove residue, thus improving operational safety.

[0014] 2. Vacuum negative pressure can be used to quickly suck the residue deposited at the bottom of the liquid seal tank to the collection tank. Compared with manual cleaning, it can remove the residue more thoroughly, effectively prevent the residue from clogging the vacuum atmospheric leg pipeline, ensure the stable operation of the vacuum liquid seal system, and reduce production interruptions caused by pipeline blockage.

[0015] 3. By draining the ethylene glycol in the residue collection tank back to the liquid seal tank through the drain line, the waste of ethylene glycol is avoided, the consumption of production materials is reduced, and the process requirements of energy saving and consumption reduction are met.

[0016] 4. The device has a simple structure and is easy to operate. The entire slag removal process can be completed through the coordinated control of valves, vacuum gauges and other components. It is easy to modify and install in the existing vacuum liquid sealing system of polyester production and has strong applicability. Attached Figure Description

[0017] Figure 1 This is a process flow diagram of a slag discharge device for a vacuum liquid sealing system according to the present invention;

[0018] The reference numerals in the accompanying drawings include:

[0019] 1. Ethylene glycol liquid seal tank; 2. Residue collection tank; 21. First valve; 22. Pipeline; 3. Drainage pipeline; 31. Drainage valve; 4. Vacuum pipeline; 41. Second valve; 42. Vacuum gauge; 5. Nitrogen input terminal; 6. User terminal; 7. Vacuum pump; 8. Motor; 9. Storage tank. Detailed Implementation

[0020] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0022] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0023] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example 1:

[0025] like Figure 1As shown, this utility model is mainly applied to the cleaning of residues in ethylene glycol liquid seal tanks during polyester production. Specifically, a slag discharge device for a vacuum liquid seal system includes: an ethylene glycol liquid seal tank 1; a residue collection tank 2, which is connected to the atmospheric leg side of the ethylene glycol liquid seal tank 1 via a pipeline 22; a first valve 21 is provided on the pipeline 22 for controlling the connection and disconnection between the two. The residue collection tank 2 is connected to the atmospheric leg side of the ethylene glycol liquid seal tank 1 via a pipeline 22. A first valve 21 on the pipeline 22 is used to control the connection and disconnection between the two. The installation height of the residue collection tank 2 is slightly higher than that of the ethylene glycol liquid seal tank 1. Its bottom is connected to the ethylene glycol liquid seal tank 1 via a drain pipeline 3. A drain valve 31 on the drain pipeline 3 can control the liquid backflow. One end of the vacuum pipeline 4 is connected to the residue collection tank 2, and the other end is connected to the vacuum pump 7. The vacuum pipeline 4 is equipped with a second valve 41 for controlling the vacuum on / off and a vacuum gauge 42 for monitoring the vacuum level. The nitrogen input end 5 is connected to the vacuum pipeline 4 for vacuum breaking operation. The motor 8 is connected to the vacuum pump 7 to provide power for the vacuum pump 7 to achieve the vacuum function. In addition, a user terminal 6 and a storage tank 9 are also provided. The user terminal 6 receives instructions and receives the processed output materials. After the vacuum breaking operation is completed, the valve at the bottom of the residue tank is opened to perform slag removal. The storage tank 9 is connected to the vacuum pump 7 to help maintain the vacuum environment and temporarily store the medium.

[0026] In practical use, this device utilizes the synergistic effect of vacuum suction and atmospheric pressure reflux as follows: Before performing the slag removal operation, first close the first valve 21 and the drain valve 31 to ensure that the residue collection tank 2 is in a closed state. Then, open the second valve 41, start the motor 8 to drive the vacuum pump 7, and perform vacuum treatment on the residue collection tank 2 through the vacuum pipeline 4. At this time, the vacuum degree in the system can be monitored by the vacuum gauge 42. When the preset vacuum degree is reached, close the second valve 41 to maintain the negative pressure state in the residue collection tank 2.

[0027] Next, the first valve 21 is opened, and the residue deposited in the ethylene glycol liquid seal tank 1 is drawn into the residue collection tank 2 along with the ethylene glycol through pipeline 22 under the negative pressure inside the residue collection tank 2. After the residue is completely drawn out, the first valve 21 is closed, and nitrogen gas is introduced into the vacuum pipeline 4 through the nitrogen inlet 5 to break the vacuum environment inside the residue collection tank 2 and restore the system to atmospheric pressure.

[0028] Subsequently, the drain valve 31 is opened. Since the installation height of the residue collection tank 2 is slightly higher than that of the ethylene glycol liquid seal tank 1, the ethylene glycol in the residue collection tank 2 can flow back into the ethylene glycol liquid seal tank 1 through the drain pipeline 3 under the action of gravity. After the ethylene glycol has completely flowed back, the drain valve 31 is closed. At this time, only the filtered and separated residue remains in the residue collection tank 2. Opening the residue collection tank 2 will complete the cleaning of the residue.

[0029] Through the above process, there is no need for manual entry into the liquid seal tank to remove slag. The collection and cleaning of residue can be automated by simply controlling the valves and cooperating with vacuum and nitrogen, which effectively reduces the amount of manual labor and operational risks, while meeting the process requirements of polyester production.

[0030] The above are merely embodiments of this utility model. The circuits, electronic components, and modules involved are all prior art, fully achievable by those skilled in the art, and require no further explanation. The content protected by this application does not involve improvements to the software and methods. Commonly known structures and characteristics in the solution are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field to which this utility model pertains prior to the application date or priority date, are able to access all prior art in that field, and possess the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A slag discharge device for a vacuum liquid seal system, characterized in that: include: Ethylene glycol liquid sealing tank (1); The residue collection tank (2) is connected to the ethylene glycol liquid seal tank (1) via a pipeline (22); a first valve (21) is provided on the pipeline (22). The drain line (3) connects the residue collection tank (2) and the ethylene glycol liquid seal tank (1), and is equipped with a drain valve (31). A vacuum pipe (4) is connected to the residue collection tank (2), and a second valve (41) and a vacuum gauge (42) are provided on the vacuum pipe (4) to create a vacuum environment for suctioning residue; The nitrogen input terminal (5) is connected to the vacuum pipe (4); A vacuum pump (7), in conjunction with the vacuum pipe (4), is used to draw a vacuum; The motor (8) is connected to the vacuum pump (7) to provide power to it.

2. The slag discharge device of a vacuum liquid seal system as described in claim 1, characterized in that: The installation height of the residue collection tank (2) is slightly higher than that of the ethylene glycol liquid seal tank (1), and the connecting pipeline (22) between the two is controlled by the first valve (21). The pipeline (22) is connected to the atmospheric leg side of the ethylene glycol liquid seal tank (1).

3. The slag discharge device of a vacuum liquid seal system as described in claim 1, characterized in that: The vacuum pipe (4) is connected to the vacuum pump (7). By controlling the second valve (41) and cooperating with the vacuum level displayed by the vacuum gauge (42), the residue in the ethylene glycol liquid seal tank (1) is sucked up.

4. The slag discharge device of a vacuum liquid seal system as described in claim 1, characterized in that: The nitrogen input terminal (5) introduces nitrogen into the vacuum pipe (4) and the residue collection tank (2) to break the vacuum, making it easier to open the residue collection tank (2) for slag removal.

5. The slag discharge device of a vacuum liquid seal system as described in claim 1, characterized in that: The drain line (3) connects the bottom of the residue collection tank (2) to the ethylene glycol liquid seal tank (1). Closing the drain valve (31) allows for vacuuming, while opening the drain valve (31) allows the liquid in the residue collection tank (2) to flow back into the ethylene glycol liquid seal tank (1).

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