Flash tank for recycling waste water in polyvinyl alcohol manufacturing and recycling process

Abstract

The utility model discloses a flash tank for recycling waste water in a polyvinyl alcohol manufacturing and recycling process, and relates to the field of polyvinyl alcohol cooling equipment, the flash tank comprises a flash cavity, a clear water cavity and a waste water cavity, the clear water cavity is positioned on one side of the flash cavity, and the clear water cavity is communicated with the flash cavity through a liquid outlet pipe; the waste water cavity is located on one side of the clear water cavity, the waste water cavity is communicated with the clear water cavity through an overflow pipe, and effective separation and recovery of polyvinyl acetate in waste water can be achieved through the structure of flash evaporation, the clear water cavity and the waste water cavity.

Description

Technical Field

[0001] This application relates to the field of polyvinyl alcohol cooling equipment, and more particularly to a flash tank for wastewater reuse in the polyvinyl alcohol manufacturing and recycling process. Background Technology

[0002] The manufacturing process of polyvinyl alcohol (PVA) generates a large amount of wastewater containing polyvinyl acetate. If this wastewater is discharged directly without proper treatment, it will not only cause serious environmental pollution but also waste valuable resources. Traditional wastewater treatment methods, such as sedimentation, filtration, and biochemical treatment, can remove pollutants from wastewater to some extent, but they often suffer from low treatment efficiency, high energy consumption, and incomplete solid-liquid separation, making it difficult to meet the dual requirements of modern industry for environmental protection and economic benefits.

[0003] Especially in the recycling process, the wastewater discharged from the three-tower reactor contains a high concentration of polyvinyl acetate, making its treatment more difficult. Therefore, developing a highly efficient, energy-saving, and environmentally friendly wastewater treatment device to effectively separate and reuse wastewater from the polyvinyl alcohol manufacturing and recycling process has become an urgent problem to be solved. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a flash tank for wastewater reuse in the polyvinyl alcohol manufacturing and recycling process, characterized in that it includes:

[0005] Flash chamber;

[0006] The clear water chamber is located on one side of the flash evaporation chamber, and the clear water chamber is connected to the flash evaporation chamber through a liquid outlet pipe;

[0007] The wastewater chamber is located to one side of the clear water chamber, and the wastewater chamber and the clear water chamber are connected by an overflow pipe.

[0008] Optionally, in some embodiments of this application, the clear water chamber is located below the flash evaporation chamber, and the outlet of the liquid outlet pipe is positioned facing the clear water chamber.

[0009] Optionally, in some embodiments of this application, the wastewater chamber is located below the clear water chamber, the overflow pipe is located between the wastewater chamber and the clear water chamber, and one end of the overflow pipe in the direction toward the clear water chamber is higher than the bottom of the clear water chamber.

[0010] Optionally, in some embodiments of this application, one end of the overflow pipe facing the flash chamber forms a gap with the bottom of the flash chamber, and the gap connects the clear water chamber and the inner cavity of the overflow pipe.

[0011] Optionally, in some embodiments of this application, the overflow pipe is sleeved outside the outlet pipe, and the inner diameter of the overflow pipe is larger than the outer diameter of the outlet pipe.

[0012] Optionally, in some embodiments of this application, the bottom of the flash chamber has an arc-shaped structure, and the liquid outlet pipe is located at the bottom of the arc-shaped structure.

[0013] Optionally, in some embodiments of this application, the bottom of the wastewater chamber is a conical structure, the outer wall of the wastewater chamber is provided with a jacket, and a waste liquid outlet is provided at the bottom of the wastewater chamber.

[0014] Optionally, in some embodiments of this application, the jacket is fitted around the wastewater chamber, and a gap is formed between the jacket and the wastewater chamber, the gap being filled with a cooling substance.

[0015] Optionally, in some embodiments of this application, the inner ring of the slit is provided with a cooling pipe, which is sleeved around the wastewater chamber.

[0016] Optionally, in some embodiments of this application, the jacket is a cooling plate, and the cooling pipe is disposed around the conical structure.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. By integrating flash evaporation and cooling sedimentation, this invention successfully achieves the effective separation and recovery of polyvinyl acetate in wastewater, which not only reduces resource waste but also improves the efficiency and economic benefits of wastewater treatment.

[0019] 2. The design of this flash tank reduces wastewater discharge and environmental pollution. Simultaneously, the recovered clean water and polyvinyl acetate can be reused as resources, promoting the development of a circular economy. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the overall structure of the flash tank provided in the embodiments of this application. Figure 1 ;

[0022] Figure 2 A schematic diagram of the overall structure of the flash tank provided in the embodiments of this application. Figure 2 ;

[0023] Figure 3 Schematic cross-section of the internal structure of the flash tank provided in the embodiments of this application. Figure 1 ;

[0024] Figure 4 Schematic cross-section of the internal structure of the flash tank provided in the embodiments of this application. Figure 2 ;

[0025] Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle.

[0026] Explanation of reference numerals in the attached figures:

[0027] 100. Flash tank; 110. Liquid outlet pipe; 120. Flash chamber; 200. Clear water chamber; 210. Overflow pipe; 220. Drain outlet; 230. Water level gauge; 300. Wastewater chamber; 310. Waste liquid outlet; 400. Gap; 500. Jacket; 510. Slit; 520. Cooling pipe; 530. Cooling plate; 600. Pumping device. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application. It is understood that the accompanying drawings are provided for reference and illustration only, and are not intended to limit this application. The connection relationships shown in the accompanying drawings are only for clear description and do not limit the connection method.

[0029] Specifically, such as Figure 1 As shown in the embodiment of this application, a flash tank 100 for wastewater reuse in the polyvinyl alcohol manufacturing and recycling process is provided. The main function of the flash tank 100 is to separate the methanol aqueous solution, thereby separating the polyvinyl acetate in the water. This separation process is mainly carried out through the flash tank 100.

[0030] In this embodiment, the main structure of the flash tank 100 is a tank body, and a flash chamber 120 is set at the top of the tank body. Specifically, the flash chamber 120 is provided with an inlet and an outlet. Wastewater enters the flash chamber 120 through the inlet. In this application, the wastewater is wastewater containing polyvinyl acetate and at 137.5°C discharged from the three-tower reactor of the recovery process. The wastewater undergoes flash evaporation in the flash chamber 120. A steam port is provided at the top of the flash chamber 120. In this embodiment, the steam port is normally open. By setting the steam port, the gas generated during the flash evaporation of the wastewater can be discharged through the steam port.

[0031] In this application, to ensure the effect of flash evaporation, the flow rate of wastewater entering the flash evaporation chamber 120 is controlled so that the wastewater can be fully flashed in the flash evaporation chamber 120. After the wastewater is flashed, it is discharged through the liquid outlet, which is located at the bottom of the flash evaporation chamber 120. The liquid outlet is connected to the liquid outlet pipe 110, which guides the wastewater so that the flashed wastewater leaves the flash evaporation chamber 120.

[0032] In this embodiment of the application, in order to fully guide the flow of wastewater, an arc-shaped structure is formed at the bottom of the flash evaporation chamber 120, and the liquid outlet pipe 110 is located at the bottom of the arc-shaped structure.

[0033] A clear water chamber 200 is provided at the bottom of the flash evaporation chamber 120. The clear water chamber 200 is integrally connected to the flash evaporation chamber 120. The main function of the clear water chamber 200 is to store the evaporated clear water for subsequent treatment. The evaporated clear water mainly comes from the evaporation process of the wastewater chamber 300.

[0034] In this embodiment, the wastewater chamber 300 is located at the bottom of the clear water chamber 200, and the liquid outlet pipe 110 of the flash evaporation chamber 120 is directly connected to the wastewater chamber 300, so that the flash-evaporated wastewater falls directly into the wastewater chamber 300 by gravity.

[0035] In this embodiment of the application, the wastewater chamber 300 is configured as a conical structure. Wastewater accumulates in the wastewater chamber 300 under the conical structure and is cooled by the jacket 500.

[0036] In this embodiment, the jacket 500 is a cooling device, which mainly cools and lowers the temperature of the wastewater in the wastewater chamber 300. Since the main component of the wastewater is polyvinyl acetate, which is in a solid or semi-solid state at room temperature, the polyvinyl acetate in the wastewater can be settled through the cooling process of the jacket 500, which facilitates solid-liquid separation.

[0037] During the cooling process of the wastewater by the cooling device, after settling, the water accumulates in the wastewater chamber 300. At this time, the remaining water is stored in the wastewater chamber 300. When it accumulates to a certain position, the remaining water is introduced into the clear water chamber 200.

[0038] In the above process, an overflow pipe 210 is connected between the clear water chamber 200 and the wastewater chamber 300, such as Figure 3-4 As shown, the overflow pipe 210 connects the clear water chamber 200 and the waste water chamber 300, so that the water in the waste water chamber 300 enters the clear water chamber 200 through the overflow pipe 210, which facilitates the separation of water and sediment.

[0039] In this embodiment, the overflow pipe 210 is configured as a vertical structure, and the overflow pipe 210 protrudes into the clear water chamber 200. That is, the end of the overflow pipe 210 facing the flash evaporation chamber 120 is higher than the bottom of the clear water chamber 200, so that when the clear water fills the overflow pipe 210, the clear water flows into the clear water chamber 200 along the outer wall of the overflow pipe 210, so that the clear water is separated from the sediment. At the same time, the liquid level in the clear water chamber 200 is equal to the height of the overflow pipe 210 in the clear water chamber 200.

[0040] In order to ensure that more clean water is stored in the clean water chamber 200, a gap 400 is formed at the end of the overflow pipe 210 near the flash chamber 120 and at the bottom of the flash chamber 120. The gap 400 allows clean water to enter the clean water chamber 200 from the overflow pipe 210, which is convenient for storing cooled clean water.

[0041] A drain outlet 220 and a water level sensor 230 are provided on the clear water chamber 200. The water level sensor 230 is connected to the clear water chamber 200 so that the water level change in the clear water chamber 200 can be observed from the outside. When the water level in the clear water chamber 200 rises, the drain outlet 220 is opened so that the water in the clear water chamber 200 is discharged from the drain outlet 220.

[0042] In the above, the jacket 500, i.e. the cooling device, mainly surrounds the wastewater chamber 300, so that a gap 510 is formed between the cooling device and the wastewater chamber 300. The gap 510 is filled with cooling material, so that the cooling material can directly cool down and settle the high-temperature wastewater in the wastewater chamber 300, and precipitate the corresponding sediment.

[0043] In the above, the cooling substance is cooling water.

[0044] A cooling pipe 520 may also be installed in the gap 510, and the cooling pipe 520 is sleeved on the outside of the wastewater chamber 300.

[0045] In this embodiment, the jacket 500 can also be configured as a cooling plate 530, which is fixedly installed on the outside of the conical structure so that the cooling plate 530 can cool the wastewater in the wastewater chamber 300.

[0046] In this application, the cooling water is either live water or circulating water, and the cooling water can be continuously cooled by the cooling equipment.

[0047] When the sediment in the wastewater chamber 300 accumulates to a certain extent, the waste liquid outlet 310 at the bottom of the wastewater chamber 300 is opened, allowing some wastewater and sediment to be discharged through the waste liquid outlet 310 at the bottom.

[0048] Meanwhile, to prevent more cooled water from being discharged from the bottom waste liquid outlet 310, in this embodiment of the application, a water pumping device 600 is preferably provided on one side of the waste water chamber 300. The water pumping device 600 can extract excess cooled water in the waste water chamber 300 to facilitate the treatment of sediment.

[0049] In the above process, in order to avoid extracting the wastewater that has just been pumped out of the flash evaporation chamber 120 during the pumping process, the diameter of the outlet pipe 110 in this embodiment is small, so that the waste liquid in the flash evaporation chamber 120 flows slowly through the outlet pipe 110. When it slowly flows into the wastewater chamber 300, since the amount of wastewater is relatively small, it can be cooled and precipitated by the jacket 500 in time, avoiding the occurrence of mixing with the clean water.

[0050] In this embodiment, the overflow pipe 210 is sleeved outside the outlet pipe 110, so that the wastewater flowing out of the outlet pipe 110 can directly enter the wastewater chamber 300 through the overflow pipe 210. In order to avoid the downstream wastewater from contaminating the clean water in the overflow pipe 210, the diameter of the outlet pipe 110 is much smaller than the diameter of the overflow pipe 210. This makes the water flow in the overflow pipe 210 extremely slow when the same volume of wastewater enters the wastewater chamber 300 through the outlet pipe 110, and the overflow speed is less than the speed of the water flowing in the outlet pipe 110, so that there is enough time for the resin to cool and settle in the wastewater chamber 300.

[0051] The above embodiments are only used to illustrate the technical methods of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of this utility model without departing from the spirit and scope of the technical methods of this utility model.

Claims

1. A flash tank for recycling process wastewater in the production of polyvinyl alcohol, characterized by The utility model relates to a flash chamber, a clean water chamber and a waste water chamber. The clean water chamber is located below the flash chamber, and the outlet pipe is arranged to direct the liquid to the clean water chamber. The waste water chamber is located below the clean water chamber, and the overflow pipe is located between the waste water chamber and the clean water chamber. The overflow pipe is arranged to direct the liquid to the flash chamber.

2. The flash tank for recycling process wastewater of polyvinyl alcohol production according to claim 1, characterized in that, The overflow pipe is arranged to direct the liquid to the flash chamber.

3. The flash tank for recycling process wastewater of polyvinyl alcohol production according to claim 1, characterized in that, The overflow pipe is arranged to direct the liquid to the flash chamber.

4. The flash tank for recycling process wastewater of polyvinyl alcohol production according to claim 1, characterized in that, The overflow pipe is arranged to direct the liquid to the flash chamber.

5. The flash tank for recycling process wastewater of polyvinyl alcohol production according to claim 4, characterized in that, The overflow pipe is arranged to direct the liquid to the flash chamber.

6. The flash tank for recycling process wastewater of polyvinyl alcohol production according to claim 1, characterized in that, The overflow pipe is arranged to direct the liquid to the flash chamber.

7. The flash tank for recycling process wastewater of polyvinyl alcohol production according to claim 1, characterized in that, The overflow pipe is arranged to direct the liquid to the flash chamber.

8. The flash tank for recycling process wastewater of polyvinyl alcohol production according to claim 7, characterized by, The overflow pipe is arranged to direct the liquid to the flash chamber.

9. The flash tank for recycling process wastewater of polyvinyl alcohol production according to claim 8, characterized by, The overflow pipe is arranged to direct the liquid to the flash chamber.

10. The flash tank for recycling process wastewater of polyvinyl alcohol production according to claim 9, wherein The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid to the flash chamber. The overflow pipe is arranged to direct the liquid

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