A multi-stage filtering wastewater treatment device for rectifying device

Abstract

The utility model discloses a multistage filtration wastewater treatment device for rectifying device, including wastewater filter tank, two condensate collection tank B and reflux spray pump, the outer surface of wastewater filter tank is equipped with first refrigerated water import, second refrigerated water import, third refrigerated water import, first refrigerated water export, second refrigerated water export and third refrigerated water export, the inside installation of wastewater filter tank has a plurality of refrigerated water coil pipe, the device is through the filtration device that increases in the recovery rectifying system wastewater flow, injects the cold water to the refrigerated water coil pipe that bends and folds through the cold water import, and sets up a plurality of chambers in wastewater filter tank, can prolong the time of wastewater in wastewater filter tank, makes wastewater temperature can reduce to below 30 DEG C, the third monomer or four monomer containing in wastewater crystallizes easily and separates out, and is filtered when passing through the metal filter screen, guarantees the unobstructed of wastewater pipeline, improves the operating stability of ethylene glycol recovery rectifying system.

Description

Technical Field

[0001] This utility model relates to the field of polyester synthesis technology production, and in particular to a multi-stage filtration wastewater treatment device for distillation units. Background Technology

[0002] During the esterification reaction of polymerization, ethylene glycol needs to be continuously consumed to participate in the reaction. However, during the polycondensation reaction, some of the ethylene glycol is released during the chain growth process due to the condensation between molecules. The released ethylene glycol contains a large amount of impurities, by-products, unreacted substances, and water produced in the reaction. Therefore, it cannot be used directly as a raw material and needs to be purified by distillation. The distillation method used in the polyester fiber production process is vacuum continuous distillation, which achieves effective separation of substances through multiple partial vaporization and partial condensation.

[0003] The original distillation unit was mainly used to reduce the water content of ethylene glycol and remove oligomers. However, when producing some differentiated polyester products, it is usually necessary to add some third or fourth monomers. This results in the recovered ethylene glycol containing a small amount of third or fourth monomers. When the ethylene glycol contains low-melting-point third or fourth monomers, under high temperature and low pressure conditions, the third or fourth monomers will also dissolve in water and be collected from the top of the column. When the temperature decreases, the third or fourth monomers will precipitate and block the spray pipeline and wastewater pipeline, affecting the operational stability of the distillation recovery system. To address these issues, we propose a multi-stage filtration wastewater treatment device for distillation units. Utility Model Content

[0004] The purpose of this invention is to provide a multi-stage filtration wastewater treatment device for a distillation unit, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A multi-stage filtration wastewater treatment device for a distillation unit includes a wastewater filtration tank, two condensate collection tanks B, and a reflux spray pump. The outer surface of the wastewater filtration tank is provided with a first chilled water inlet, a second chilled water inlet, a third chilled water inlet, a first chilled water outlet, a second chilled water outlet, and a third chilled water outlet. Multiple chilled water coils are installed inside the wastewater filtration tank.

[0007] In a further embodiment, each of the chilled water coils has a diameter of DN25.

[0008] In a further embodiment, the wastewater filtration tank is divided into three chambers, and the wastewater from each chamber is discharged to the next chamber through overflow.

[0009] In a further embodiment, the wastewater filtration tank is provided with a plurality of metal filter screens, each of which is installed at the overflow port.

[0010] In a further embodiment, both condensate collection tanks B are connected to a reflux spray pump, and both condensate collection tanks B are connected to a wastewater filtration tank.

[0011] In a further embodiment, the reflux spray pump is connected to the distillation tower, and the wastewater filter tank is connected to the wastewater transfer pump.

[0012] In a further embodiment, the outer surface of the wastewater filter tank (1) is provided with a first wastewater discharge port, a second wastewater discharge port, a third wastewater discharge port, a fourth wastewater discharge port, a fifth wastewater discharge port and a sixth wastewater discharge port.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This device adds a filtration system to the wastewater process of the ethylene glycol recovery distillation system. Cold water is injected into the curved chilled water coil through a cold water inlet, and multiple chambers are set up in the wastewater filtration tank. This extends the time that the wastewater spends in the filtration tank, allowing the wastewater temperature to be reduced to below 30°C. The third or fourth monomers contained in the wastewater can easily crystallize and precipitate out, and are filtered out when passing through the metal filter screen, ensuring the unobstructed flow of the wastewater pipeline and improving the operational stability of the ethylene glycol recovery distillation system. Attached Figure Description

[0015] Fig. 1 This is a schematic diagram of a distillation system for a multi-stage filtration wastewater treatment unit used in a distillation apparatus.

[0016] Fig. 2 This is a schematic diagram of a wastewater filtration tank used in a multi-stage filtration wastewater treatment system for a distillation unit.

[0017] Fig. 3 This is a schematic diagram of the wastewater filter tank pipe opening of a multi-stage filtration wastewater treatment device used in a distillation unit.

[0018] In the diagram: 1. Wastewater filtration tank; 2. Condensate collection tank B; 3. Return spray pump; 4. Chilled water coil; 5. Metal filter screen; d1. First chilled water inlet; d2. Second chilled water inlet; d3. Third chilled water inlet; e1. First chilled water outlet; e2. Second chilled water outlet; e3. Third chilled water outlet; a. First wastewater discharge outlet; b1. Second wastewater discharge outlet; b2. Third wastewater discharge outlet; b3. Fourth wastewater discharge outlet; b4. Fifth wastewater discharge outlet; c. Sixth wastewater discharge outlet. Detailed Implementation

[0019] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0021] 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.

[0022] Please see Figs. 1-3 In this utility model, a multi-stage filtration wastewater treatment device for a distillation unit includes a wastewater filtration tank 1, two condensate collection tanks B2, and a reflux spray pump 3. The outer surface of the wastewater filtration tank 1 is provided with a first chilled water inlet d1, a second chilled water inlet d2, a third chilled water inlet d3, a first chilled water outlet e1, a second chilled water outlet e2, and a third chilled water outlet e3. Multiple chilled water coils 4 are installed inside the wastewater filtration tank 1. By injecting cold water into the chilled water coils 4, the temperature of the wastewater can be lowered, thereby causing the third or fourth monomer in the wastewater to crystallize and precipitate, ensuring the smooth flow of the wastewater pipeline and improving the operational stability of the ethylene glycol recovery distillation system.

[0023] Each chilled water coil 4 has a diameter of DN25. Each chilled water coil 4 is evenly distributed in a curved manner within the wastewater filter tank 1. The wastewater filter tank 1 is divided into three chambers, and the wastewater in each chamber is discharged to the next chamber through overflow. The interior of the wastewater filter tank 1 is equipped with multiple metal filter screens 5, each of which is installed at the overflow port. By setting up multiple chambers in the wastewater filter tank 1 and discharging the wastewater to the next chamber through overflow, the time that the wastewater spends in the wastewater filter tank 1 can be extended, thereby extending the cooling time. By setting up the metal filter screens 5, the precipitated crystals can be filtered.

[0024] Both condensate collection tanks B2 are connected to the reflux spray pump 3, and both condensate collection tanks B2 are connected to the wastewater filter tank 1. The reflux spray pump 3 is connected to the distillation tower, and the wastewater filter tank 1 is connected to the wastewater transfer pump. The outer surface of the wastewater filter tank 1 is provided with a first wastewater discharge port a, a second wastewater discharge port b1, a third wastewater discharge port b2, a fourth wastewater discharge port b3, a fifth wastewater discharge port b4, and a sixth wastewater discharge port c. By opening the wastewater discharge port in the wastewater filter tank 1, the filter water tank can be discharged and cleaned.

[0025] The working principle of this utility model is as follows:

[0026] When using this device, wastewater is pumped into the wastewater filter tank 1 by a wastewater transfer pump. Cold water is injected into the chilled water coil 4 to cool the distillation reflux spray wastewater. The wastewater overflows from each chamber of the wastewater filter tank 1 to the next chamber. The metal filter screen 5 at the overflow port can filter the crystals in the wastewater. The filtered wastewater is collected in the condensate collection tank B2 and then sprayed and cooled by the reflux spray pump 3.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0028] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-stage filtration wastewater treatment device for a distillation unit, characterized in that: It includes a wastewater filter tank (1), two condensate collection tanks B (2) and a return spray pump (3). The outer surface of the wastewater filter tank (1) is provided with a first chilled water inlet (d1), a second chilled water inlet (d2), a third chilled water inlet (d3), a first chilled water outlet (e1), a second chilled water outlet (e2) and a third chilled water outlet (e3). Multiple chilled water coils (4) are installed inside the wastewater filter tank (1).

2. The multi-stage filtration wastewater treatment device for a distillation unit according to claim 1, characterized in that: Each of the chilled water coils (4) has a diameter of DN25.

3. A multi-stage filtration wastewater treatment device for a distillation unit according to claim 1, characterized in that: The wastewater filtration tank (1) is divided into three chambers, and the wastewater in each chamber is discharged to the next chamber through overflow.

4. A multi-stage filtration wastewater treatment device for a distillation unit according to claim 1, characterized in that: The wastewater filtration tank (1) is equipped with multiple metal filter screens (5), and each metal filter screen (5) is installed at the overflow port.

5. A multi-stage filtration wastewater treatment device for a distillation unit according to claim 1, characterized in that: Both of the condensate collection tanks B(2) are connected to the reflux spray pump (3), and both of the condensate collection tanks B(2) are connected to the wastewater filter tank (1).

6. A multi-stage filtration wastewater treatment device for a distillation unit according to claim 1, characterized in that: The reflux spray pump (3) is connected to the distillation tower, and the wastewater filter tank (1) is connected to the wastewater transfer pump.

7. A multi-stage filtration wastewater treatment device for a distillation unit according to claim 1, characterized in that: The outer surface of the wastewater filtration tank (1) is provided with a first wastewater discharge port (a), a second wastewater discharge port (b1), a third wastewater discharge port (b2), a fourth wastewater discharge port (b3), a fifth wastewater discharge port (b4), and a sixth wastewater discharge port (c).

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