CN220098685U

CN220098685U - PVC mother liquor water recovery unit

Info

Publication number: CN220098685U
Application number: CN202320267759.0U
Authority: CN
Inventors: 付小军; 薛玉钊; 孔令凯; 李小龙
Original assignee: Henan Lianchuang Chemical Co ltd
Current assignee: Henan Lianchuang Chemical Co ltd
Priority date: 2023-02-21
Filing date: 2023-02-21
Publication date: 2023-11-28
Anticipated expiration: 2033-02-21

Abstract

The utility model discloses a PVC mother liquor water recovery device, wherein a settling tank is of a double-layer cavity structure and comprises an inner cavity and an outer cavity, a first inlet, a second inlet and a third inlet are formed in the side wall of the upper section of the settling tank, PVC mother liquor water enters the inner cavity from the first inlet, cooling water enters the outer cavity from the third inlet, and the second inlet is communicated with the inner cavity and is used for adding flocculant; the sedimentation tank is characterized in that an outlet I is arranged on the side wall of the bottom of the sedimentation tank, one end of the outlet I is communicated with an external cavity, the other end of the outlet I is communicated with a cooling water inlet of the cooling device, an outlet II is arranged on the side wall of the sedimentation tank, one end of the outlet II is communicated with an internal cavity, the other end of the outlet II is connected with a water pump I, the outlet I of the water pump is connected with a mother liquor water inlet of the cooling device, and a mother liquor water outlet of the cooling device is connected with an inlet of the filtering tank. The utility model has simple structure and convenient use, can fully recover the heat of the PVC mother liquor water, avoid heat waste, and fully filter the PVC mother liquor water to meet the recycling requirement.

Description

PVC mother liquor water recovery unit

Technical Field

The utility model relates to the technical field of mother liquor water recovery devices, in particular to a PVC mother liquor water recovery device.

Background

At present, domestic polyvinyl chloride industry mainly uses a calcium carbide acetylene method to produce polyvinyl chloride, wherein a large amount of desalted water is used in the suspension polymerization process of the polyvinyl chloride, which is one of the main production energy consumption. In the suspension polymerization production process, a large amount of desalted water is consumed for feeding and flushing, if a mother liquor water recovery device is not provided, the desalted water added in the polymerization process is centrifugally separated in the finished product process to form mother liquor water which is completely discharged as waste water, so that energy waste is caused, and the yield of desalted water in the polyvinyl chloride production is kept high.

Publication (bulletin) number: the utility model patent of CN210385122U provides a PVC mother liquor water recovery treatment device, which is provided with sand stones with different specifications in a sand filter, fine polyvinyl chloride particles, auxiliary agent suspended matters and partial organic matters remained in the mother liquor water are filtered, and after filtration, the mother liquor water is cooled by circulating water and then is sent into a water storage tank to be used as flushing water and partial shaft seal water in a polymerization process; although the PVC mother liquor water can be filtered and recycled, the cooling device is arranged behind the sedimentation tank and the filtering tank, and the heat in the PVC mother liquor water cannot be fully recycled.

Disclosure of Invention

The utility model aims to solve the technical problems and provide the PVC mother liquor water recovery device.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows: the PVC mother liquor water recovery device comprises a settling tank, a cooling device and a filtering tank, wherein the settling tank is of a double-layer cavity structure and comprises an inner cavity and an outer cavity, a first inlet, a second inlet and a third inlet are formed in the side wall of the upper section of the settling tank, PVC mother liquor water enters the inner cavity from the first inlet, cooling water enters the outer cavity from the third inlet, and the second inlet is communicated with the inner cavity and is used for adding flocculant; the sedimentation tank is characterized in that an outlet I is formed in the side wall of the bottom of the sedimentation tank, one end of the outlet I is communicated with an external cavity, the other end of the outlet I is communicated with a cooling water inlet of the cooling device, an outlet II is formed in the side wall of the sedimentation tank, one end of the outlet II is communicated with an internal cavity, a water pump I is connected with the other end of the outlet II, an outlet of the water pump I is connected with a mother liquor water inlet of the cooling device, and a mother liquor water outlet of the cooling device is connected with an inlet of the filtering tank.

Furthermore, the bottom of the internal cavity is of a funnel-shaped structure, a drain pipe is arranged at the bottom of the internal cavity, the bottom of the drain pipe is connected with a spiral feeder, and a valve is arranged on an outlet of the spiral feeder.

Further, a supporting frame is arranged at the bottom of the inner cavity, a stirrer is arranged at the top of the supporting frame, and the outlet is positioned above the stirrer.

Further, the top of the inner cavity is provided with a hydraulic telescopic rod, and the bottom of the inner cavity is provided with a filter plate.

Further, the edge of the filter plate is provided with a scraping strip, and the scraping strip is in contact with the inner wall of the inner cavity.

Furthermore, the cooling water in the cooling device and the PVC mother liquor water flow in opposite directions.

Further, be equipped with a plurality of filter in the filtration jar, a plurality of filter from last filtration precision to lower increases gradually, the slope of filter sets up, and upper and lower adjacent two filter incline opposite directions.

Compared with the prior art, the utility model has the advantages that: according to the utility model, the sedimentation tank is of a double-layer cavity structure, PVC mother liquor water is settled in the inner cavity, meanwhile, cooling water is introduced into the outer cavity for preliminary cooling and heat exchange, so that heat waste in the sedimentation process is avoided, impurities in the settled PVC mother liquor water are reduced, pipeline blockage caused by scaling in a cooling device is avoided, and then the final fine filtration is carried out to meet the recycling requirement.

Drawings

FIG. 1 is a schematic diagram of a PVC mother liquor water recovery device.

Fig. 2 is a schematic top view of a filter plate of a PVC mother liquor water recovery device according to the present utility model.

As shown in the figure: 1. a settling tank; 2. a cooling device; 3. a filter tank; 4. an inlet I; 5. inlet II; 6. an inlet III; 7. an outlet I; 8. an outlet II; 9. a first water pump; 10. a blow-down pipe; 11. a screw feeder; 12. a support frame; 13. a stirrer; 14. a hydraulic telescopic rod; 15. a filter plate; 16. scraping the strip; 17. and (5) a filter plate.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the term "connected" should be interpreted broadly, and for example, it may be a fixed connection, a removable connection, or an integral connection; the specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to the attached drawings, the PVC mother liquor water recovery device comprises a settling tank 1, a cooling device 2 and a filtering tank 3, wherein the settling tank 1 is of a double-layer cavity structure and comprises an inner cavity and an outer cavity, an inlet I4, an inlet II 5 and an inlet III 6 are formed in the side wall of the upper section of the settling tank 1, PVC mother liquor water enters the inner cavity from the inlet I4, cooling water enters the outer cavity from the inlet III 6, and the inlet II 5 is communicated with the inner cavity and is used for adding flocculant; the sedimentation tank 1 is provided with an outlet I7 on the bottom side wall, one end of the outlet I7 is communicated with an external cavity, the other end of the outlet I is communicated with a cooling water inlet of the cooling device 2 (a water pump II can be arranged in the middle of the outlet I, cooling water is pumped into the cooling device 2), the sedimentation tank 1 is provided with an outlet II 8 on the side wall, one end of the outlet II is communicated with an internal cavity, the other end of the outlet II is connected with a water pump I9, an outlet of the water pump I9 is connected with a mother liquor inlet of the cooling device 2, and a mother liquor outlet of the cooling device 2 is connected with an inlet of the filtering tank 3.

As shown in the figure, the top of the sedimentation tank 1 is provided with an openable cover, so that the filter plate is convenient to replace.

The bottom of the internal cavity is of a funnel-shaped structure, a drain pipe 10 is arranged at the bottom of the internal cavity, the bottom of the drain pipe 10 is connected with a spiral feeder 11, a valve is arranged on an outlet of the spiral feeder 11, and sludge settled at the bottom of the internal cavity can be discharged by starting the spiral feeder 11 after the valve is opened.

The utility model discloses a flocculation device, including inside cavity, including PVC mother liquor, the inside cavity bottom is equipped with support frame 12 (support frame 12 is in the funnel that the cross structure flocculation thing can fall to inside cavity bottom) inside cavity bottom, support frame 12 top is equipped with mixer 13, thereby sets up mixer 13 and can make flocculating agent and PVC mother liquor water intensive mixing, realizes flocculation sedimentation, export two 8 are located mixer 13 top, conveniently extract the top clear liquid.

The top of the internal cavity is provided with a hydraulic telescopic rod 14, the bottom of the internal cavity is provided with a filter plate 15, after a period of sedimentation, the filter plate 15 is driven by the hydraulic telescopic rod 14 to slowly move downwards to intercept dirt below the filter plate 15, the filter plate 15 is positioned below the outlet II 8 when the hydraulic telescopic rod 14 extends to the longest, the stirrer 13 is positioned above, and the filter plate 15 is positioned above the inlet I4 and the inlet II 5 when the hydraulic telescopic rod 14 is shortest.

The edge of the filter plate 15 is provided with a scraping strip 16, the scraping strip 16 is in contact with the inner wall of the inner cavity, and the inner wall of the inner cavity is scraped and washed when the filter plate 15 moves up and down, so that dirt is prevented from being adhered to the inner wall of the inner cavity.

The cooling water in the cooling device 2 and the PVC mother liquor water flow in opposite directions, so that the cooling water is gradually heated, and heat exchange is fully performed.

A plurality of filter plates 17 are arranged in the filter tank 3, and the filter precision of the filter plates 17 is gradually increased from top to bottom, so that the filter effect is better, the filter plates 17 are obliquely arranged, the oblique directions of the upper adjacent filter plates 17 and the lower adjacent filter plates 17 are opposite, the area of the filter plates 17 is increased, and the quick filtering is convenient.

The outlet of the filtering tank 3 can be connected with a water pump III, and the outlet of the water pump III is connected with a water storage tank.

In the concrete implementation of the utility model, PVC mother liquor water is sent into a settling tank from an inlet I, flocculant is sent into an inlet II, cooling water is sent into an external cavity from an inlet III, preliminary heat exchange is carried out in the settling process, a stirrer is started for stirring, impurities in the PVC mother liquor water are condensed into flocculent, stirring is stopped for settling, a hydraulic telescopic rod is started to drive a filter plate to slowly move downwards, impurities are pressed down for accelerating settling, clear liquor at the filtering position above the filter plate is filtered, the filter plate is lowered to the lowest, the clear liquor is pumped into a cooling device by a water pump I for heat exchange and cooling, cooling water in the external cavity is pumped into the cooling device (because the filter plate is pressed down for accelerating settling in the utility model, a large temperature difference still exists between the cooling water and the cooling water), the cooling water in the external cavity is pumped into the cooling device for full heat exchange, the heat of the PVC mother liquor water is fully absorbed, the heat of the PVC mother liquor water is recovered, the cooled clear liquor enters a filtering tank for filtering again, and the filtered clear liquor reaches the standard after the filtering of a plurality of filter plates in the filtering tank, and the cooled clear liquor is directly recovered into a water storage tank for storage and direct use; and starting the spiral feeder to discharge flocculate in the settling tank.

The utility model and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the utility model as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present utility model.

Claims

1. The utility model provides a PVC mother liquor water recovery unit, includes setting tank (1), cooling device (2) and filtration jar (3), its characterized in that: the sedimentation tank (1) is of a double-layer cavity structure and comprises an inner cavity and an outer cavity, a first inlet (4), a second inlet (5) and a third inlet (6) are formed in the side wall of the upper section of the sedimentation tank (1), PVC mother liquor water enters the inner cavity from the first inlet (4), cooling water enters the outer cavity from the third inlet (6), and the second inlet (5) is communicated with the inner cavity and used for adding flocculant; an outlet I (7) is arranged on the side wall of the bottom of the settling tank (1), one end of the outlet I (7) is communicated with an external cavity, the other end of the outlet I is communicated with a cooling water inlet of the cooling device (2), an outlet II (8) is arranged on the side wall of the settling tank (1), one end of the second outlet (8) is communicated with the internal cavity, the other end of the second outlet is connected with the first water pump (9), the outlet of the first water pump (9) is connected with the mother liquor water inlet of the cooling device (2), and the mother liquor water outlet of the cooling device (2) is connected with the inlet of the filtering tank (3).

2. The PVC mother liquor water recovery apparatus of claim 1, wherein: the bottom of the internal cavity is of a funnel-shaped structure, a drain pipe (10) is arranged at the bottom of the internal cavity, the bottom of the drain pipe (10) is connected with a spiral feeder (11), and a valve is arranged on an outlet of the spiral feeder (11).

3. The PVC mother liquor water recovery apparatus of claim 1, wherein: the bottom of the inner cavity is provided with a supporting frame (12), the top of the supporting frame (12) is provided with a stirrer (13), and the second outlet (8) is positioned above the stirrer (13).

4. The PVC mother liquor water recovery apparatus of claim 1, wherein: the top of the inner cavity is provided with a hydraulic telescopic rod (14), and the bottom of the inner cavity is provided with a filter plate (15).

5. The PVC mother liquor water recovery apparatus of claim 4, wherein: the edge of the filter plate (15) is provided with a scraping strip (16), and the scraping strip (16) is contacted with the inner wall of the inner cavity.

6. The PVC mother liquor water recovery apparatus of claim 1, wherein: the cooling water in the cooling device (2) and the PVC mother liquor water flow in opposite directions.

7. The PVC mother liquor water recovery apparatus of claim 1, wherein: a plurality of filter plates (17) are arranged in the filter tank (3), the filter precision of the filter plates (17) is gradually increased from top to bottom, the filter plates (17) are obliquely arranged, and the oblique directions of the upper adjacent filter plates (17) and the lower adjacent filter plates (17) are opposite.