Spraying and defoaming device for EG liquid seal tank system of PETG device

Abstract

The utility model belongs to the technical field of polyester production, and discloses a spraying and defoaming device for an EG liquid seal tank system of a PETG (polyethylene terephthalate glycol) device, which comprises a scraper condenser, an atmospheric leg pipeline fixedly connected to the rear side of the scraper condenser, a hot well tank fixedly connected to the other end of the atmospheric leg pipeline, a total EG pipeline body fixedly connected to the other end of the hot well tank, and an EG liquid seal tank body fixedly connected to the total EG pipeline body. The outer side of the total EG pipeline body is sleeved with a filter, the right side of the filter is provided with an EG circulating pump, the outer side of the EG circulating pump is fixedly connected with a newly-added EG pipeline, the other end of the newly-added EG pipeline penetrates through a cover plate, and the bottom end of the cover plate is fixedly connected with a defoaming equipment assembly. The problems that foam needs to be removed or fished out in time, finally, foam needs to be fished manually and needs to be fished every hour, the fished-out foam forms white powdery waste after being dried and needs to be subjected to professional treatment, and a large amount of labor and resources are wasted are solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of polyester production, specifically a spray defoaming device for the EG liquid seal tank system of a PETG unit. Background Technology

[0002] The EG liquid seal tank system is a device used in the polyester production process for vacuuming the ethylene glycol circulation system and cleaning up by-reaction products. It mainly consists of an inner chamber vacuum liquid seal, a basket filter, and an outer chamber ethylene glycol circulation system.

[0003] When NPG is used as a raw material to produce PETG, NPG reacts with ethylene glycol and PTA through esterification and polycondensation reactions to produce PETG products. When using NPG as a raw material, foam may be caused by factors such as stirring during the EG cycle, gases generated by chemical reactions, or impurities. A large amount of foam byproducts will be generated in the hot well tank, which need to be retrieved from the system or eliminated.

[0004] Meanwhile, patent application number 201520388675.8 discloses a spray defoaming device, including an alkaline circulation tank that can hold alkaline solution and at least one foam conduit with one end connected to the side wall of the alkaline circulation tank. The interfaces of each foam conduit and the alkaline circulation tank are all located above the alkaline solution surface. It also includes a foam elimination mechanism, which includes a defoaming pipe and at least one alkaline spray assembly. One end of each foam conduit is connected to the defoaming pipe. Each alkaline spray assembly includes a spray pipe inserted into the defoaming pipe. Each spray pipe is connected to the lower end of the alkaline circulation tank, and at least one recovery pipe connected to the alkaline circulation tank is provided at the bottom of the defoaming pipe.

[0005] However, during the implementation of the relevant technology, it was discovered that the aforementioned spray defoaming device generates a large amount of foam in the hot well tank, which needs to be eliminated or removed in a timely manner. Otherwise, the continuously generated large amount of foam will overflow from the hot well, causing safety hazards and environmental problems. Furthermore, if the hot well tank is sealed and not removed, the foam will enter the exhaust gas system through the pipeline, clogging the exhaust gas pipeline or entering the scrubbing tower and mixing with the water, causing the COD of the scrubbing water to exceed the standard and become unmanageable. Finally, manual removal of the foam is required, which needs to be done every hour. Moreover, the removed foam, after drying, forms a white powdery waste that requires professional treatment, resulting in a large waste of manpower and resources. Utility Model Content

[0006] To address the problems mentioned in the background art, this utility model provides a spray defoaming device for the EG liquid seal tank system of a PETG unit. It has the advantages of defoaming by utilizing the original conveying system of the hot well tank for reflux, avoiding contamination of the production medium by new equipment and other media, and eliminating the need for manual foam removal. The spray defoaming system is arranged above the hot well tank, and the generated foam is reduced by using circulating EG to physically flush and dissolve it.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a spray defoaming device for an EG liquid seal tank system of a PETG unit, comprising a scraped condenser, a large air leg pipeline fixedly connected to the rear side of the scraped condenser, a hot well tank fixedly connected to the other end of the large air leg pipeline, a main EG pipeline body fixedly connected to the other end of the hot well tank, a filter sleeved on the outside of the main EG pipeline body, an EG circulation pump arranged on the right side of the filter, a new EG pipeline fixedly connected to the outside of the EG circulation pump, a cover plate penetrating the other end of the new EG pipeline, a defoaming equipment assembly fixedly connected to the bottom end of the cover plate, and the defoaming equipment assembly being arranged on the outside of the inner top of the hot well tank.

[0008] Preferably, an EG distribution pipe is fixedly connected to the bottom end of the defoaming equipment component, and a spray head is fixedly connected to the bottom end of the EG distribution pipe.

[0009] Preferably, the interior of the filter is a cavity, and an anti-foaming mesh is provided inside the filter.

[0010] Preferably, a valve is fitted on the outside of the newly added EG pipeline, an extension plate is fixedly connected to the outside of the valve, and a motor is fixedly connected to the top of the extension plate.

[0011] Preferably, the output end of the motor is rotatably connected to a belt, a rotating shaft is sleeved on the outside of the belt, and a clamping disc is rotatably connected to the other end of the rotating shaft.

[0012] Preferably, the outer side of the clamping disc is rotatably disposed inside the valve, and the outer side of the newly added EG pipeline is disposed on the right side of the main EG pipeline body.

[0013] Preferably, a heating ring is fitted on the outer side of the main EG pipeline body, and a scale is fixedly connected to the outer side of the heating ring.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. This utility model utilizes the built-in circulation pump system, which consists of a return pipeline and spray components, to defoam in the polyester industry by using the original conveying system of the hot well tank for return flow. This avoids contamination of the production medium by additional equipment and other media. A spray defoaming system is arranged above the hot well tank, and the generated foam is reduced by using circulating EG to physically flush and dissolve it. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the main EG pipeline structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the cover plate structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the component structure of the defoaming equipment of this utility model;

[0020] Figure 5 This is a schematic diagram of the clamping disc structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the EG circulating pump structure of this utility model.

[0022] In the diagram: 1. Scraped condenser; 2. Large air leg pipeline; 3. Hot well tank; 4. Main EG pipeline body; 5. Filter; 6. EG circulation pump; 7. New EG pipeline; 8. Valve; 9. Defoaming equipment assembly; 10. Cover plate; 11. EG distribution pipe; 12. Spray head; 13. Defoaming net; 14. Heating ring; 15. Scale; 16. Extension plate; 17. Motor; 18. Belt; 19. Rotating shaft; 20. Clamping plate. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1 to 6As shown, this utility model provides a spray defoaming device for an EG liquid seal tank system of a PETG unit, including a scraper condenser 1. A large air leg pipeline 2 is fixedly connected to the rear side of the scraper condenser 1. A hot well tank 3 is fixedly connected to the other end of the large air leg pipeline 2. A main EG pipeline body 4 is fixedly connected to the other end of the hot well tank 3. A filter 5 is sleeved on the outside of the main EG pipeline body 4. An EG circulation pump 6 is arranged on the right side of the filter 5. An additional EG pipeline 7 is fixedly connected to the outside of the EG circulation pump 6. A cover plate 10 passes through the other end of the additional EG pipeline 7. A defoaming equipment assembly 9 is fixedly connected to the bottom end of the cover plate 10. The defoaming equipment assembly 9 is arranged on the outside of the inner top of the hot well tank 3.

[0025] Specifically, the bottom of the defoaming equipment component 9 is fixedly connected to an EG distribution pipe 11, which facilitates the dispersion of EG defoamer. The bottom of the EG distribution pipe 11 is fixedly connected to a spray head 12, and the impact force of the spray liquid and its own surface tension characteristics can cause the foam liquid film to break.

[0026] Furthermore, the interior of filter 5 is designed as a cavity, and defoaming net 13 is installed inside filter 5. The foam is squeezed and broken up when it passes through filter 5.

[0027] Furthermore, a valve 8 is fitted on the outside of the newly added EG pipeline 7. The valve 8 is used to control the flow rate. An extension plate 16 is fixedly connected to the outside of the valve 8. A motor 17 is fixedly connected to the top of the extension plate 16. The motor 17 is used for driving.

[0028] It is worth noting that the output end of the motor 17 is rotatably connected to the belt 18, which drives the rotating shaft 19 to rotate. The rotating shaft 19 drives the clamping plate 20 to rotate. If a lot of foam is generated, a larger spray flow rate is required to eliminate the foam in time. The flow rate can be controlled by installing the flow regulating valve 8, and it must be combined with the foam monitoring system.

[0029] It is worth noting that the outer side of the clamping disc 20 is rotatably set inside the valve 8. The clamping disc 20 is used to block the foam. The outer side of the new EG pipeline 7 is set on the right side of the main EG pipeline body 4.

[0030] It is worth mentioning that a heating ring 14 is fitted on the outside of the main EG pipeline body 4. The heating ring 14 is used for heating, and a scale 15 is fixedly connected to the outside of the heating ring 14 to measure the temperature.

[0031] The main EG pipeline body 4 and the EG circulation pump 6 are existing technologies and will not be described in detail. Additionally, this utility model also includes a power supply, controller, and switch, which are not the main technical points of this patent and will not be described in detail. The "front, rear, left, and right" views of this device are... Figure 1 The direction shown in the diagram is the reference.

[0032] Working principle: The liquid containing EG and NPG in the scraped condenser 1 enters the inner chamber of the hot well tank 3 through the atmospheric leg pipeline 2, and then overflows into the outer chamber. After passing through the main EG pipeline body 4, it enters the defoaming net 13 inside the filter 5. The foam is squeezed and broken up by the filter 5. After filtration, it passes through the EG circulation pump 6 and the outer side of the heating ring 14 is fixedly connected to the scale 15 for temperature measurement. Then it enters the scraped condenser 1 to capture the EG and NPG mixed gas.

[0033] In the hot well tank 3, a large amount of foam byproducts are generated. One end of the newly added EG pipeline 7 is connected to the main EG pipeline body 4 after the EG circulation pump 6, and the other end is connected to the defoaming equipment assembly 9. The newly added EG pipeline 7 is equipped with a valve 8. The belt 18 drives the rotating shaft 19 to rotate, and the rotating shaft 19 drives the clamping plate 20 to rotate. If a lot of foam is generated, a larger spray flow rate is required to eliminate the foam in time. The flow rate can be controlled by installing the flow regulating valve 8, and it should be combined with the foam monitoring system. Through the defoaming equipment assembly 9, the circulating EG reduces foam generation through physical flushing and dissolution.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spray defoaming device for an EG liquid seal tank system of a PETG plant, comprising a scraped condenser (1), characterized in that: A large air leg pipeline (2) is fixedly connected to the rear side of the scraper condenser (1). A hot well tank (3) is fixedly connected to the other end of the large air leg pipeline (2). A main EG pipeline body (4) is fixedly connected to the other end of the hot well tank (3). A filter (5) is sleeved on the outside of the main EG pipeline body (4). An EG circulation pump (6) is set on the right side of the filter (5). A new EG pipeline (7) is fixedly connected to the outside of the EG circulation pump (6). A cover plate (10) passes through the other end of the new EG pipeline (7). A defoaming device assembly (9) is fixedly connected to the bottom end of the cover plate (10). The defoaming device assembly (9) is set on the outside of the hot well tank (3) at the top inside.

2. The spray defoaming device for the EG liquid seal tank system of a PETG unit according to claim 1, characterized in that: The bottom end of the defoaming equipment component (9) is fixedly connected to an EG distribution pipe (11), and the bottom end of the EG distribution pipe (11) is fixedly connected to a spray head (12).

3. The spray defoaming device for the EG liquid seal tank system of a PETG unit according to claim 1, characterized in that: The filter (5) is provided with a cavity inside, and an antifoaming net (13) is provided inside the filter (5).

4. The spray defoaming device for the EG liquid seal tank system of a PETG unit according to claim 1, characterized in that: A valve (8) is fitted on the outside of the newly added EG pipeline (7), and an extension plate (16) is fixedly connected to the outside of the valve (8). A motor (17) is fixedly connected to the top of the extension plate (16).

5. The spray defoaming device for the EG liquid seal tank system of a PETG unit according to claim 4, characterized in that: The output end of the motor (17) is rotatably connected to a belt (18), and a rotating shaft (19) is sleeved on the outside of the belt (18). The other end of the rotating shaft (19) is rotatably connected to a clamping disc (20).

6. The spray defoaming device for the EG liquid seal tank system of a PETG unit according to claim 5, characterized in that: The outer side of the clamping disc (20) is rotatably disposed inside the valve (8), and the outer side of the newly added EG pipeline (7) is disposed on the right side of the main EG pipeline body (4).

7. The spray defoaming device for the EG liquid seal tank system of a PETG unit according to claim 6, characterized in that: A heating ring (14) is fitted on the outside of the main EG pipeline body (4), and a scale (15) is fixedly connected to the outside of the heating ring (14).

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