A vinylene carbonate production wastewater treatment system and treatment method

Abstract

The present invention relates to the technical field of wastewater treatment, in particular to a vinylene carbonate production wastewater treatment system and method; the system comprises a neutralization tower and a bracket at the bottom of the neutralization tower; a liquid inlet joint is provided at the top of the neutralization tower, and a liquid outlet joint is provided at the bottom of the neutralization tower; a through groove is provided outwardly at the upper position of the inner wall of the neutralization tower; an annular avoidance shell is tightened to the outer wall of the neutralization tower by a first bolt; the avoidance shell can block the through groove; an upper hole plate is fixedly connected to the inner wall of the neutralization tower above the through groove; a lower hole plate is movably connected to the inner wall of the neutralization tower below the through groove; the present invention changes with the amount of wastewater entering the neutralization tower through the lower hole plate, so that the height of the neutralization material in the neutralization tower can adapt to the change of the wastewater amount, thereby ensuring the neutralization effect of the wastewater while improving the wastewater flow efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, in particular to a vinylene carbonate production wastewater treatment system and method. Background Art

[0002] Vinylene carbonate is an additive for lithium battery electrolytes. Chloroethylene carbonate undergoes a dechlorination reaction under alkaline conditions (in the presence of triethylamine) to produce vinylene carbonate and hydrogen chloride. Triethylamine acts as a base in the reaction, combining with hydrogen chloride to form triethylamine hydrochloride. After adding alkali to triethylamine hydrochloride, it evaporates, removing most of the triethylamine. This results in a large amount of sodium chloride in the water, with some triethylamine remaining unevaporated. This high-temperature, strongly alkaline evaporation residue after triethylamine recovery is the wastewater to be treated using this technology. The wastewater is primarily composed of sodium chloride, but also contains residual triethylamine, triethylamine hydrochloride, and other organic matter and salts introduced during the production process. Triethylamine is biotoxic and can harm aquatic life and the ecological environment. Furthermore, the organic matter in the wastewater can be highly stable and difficult to biodegrade, increasing the difficulty of wastewater treatment. The current treatment process for this wastewater is mainly the MVR evaporation desalination and biochemical combined process. Evaporation can remove salt, and the evaporated condensed water enters the biochemical treatment. The disadvantages are that the amount of evaporated water is large, the energy consumption is high, the crystallized salt is hazardous waste and cannot be utilized as a resource, the evaporated water has poor biodegradability, and the biochemical effect is not ideal.

[0003] The first step in treating vinylene carbonate production wastewater is to neutralize the wastewater and adjust the water quality and quantity. Wastewater neutralization is divided into two types according to the process: a dosing neutralization tank and a filtration neutralization tank. The dosing neutralization method is to add alkaline or acidic reagents before the wastewater enters the neutralization tank so that the acidic or alkaline wastewater and the reagents are uniformly mixed in the tank and then subjected to neutralization reaction treatment. The filtration neutralization method is to add filter media with neutralizing properties to the tank so that the acidic wastewater is neutralized when passing through the filter media. Sometimes, alkaline wastewater and acidic wastewater are directly mixed in the tank for neutralization treatment. The advantages of the filtration neutralization tank are that it is easy to operate, does not require manual dosing, and reduces labor intensity; it has low cost, saves on reagent-related expenses, reacts quickly, and can quickly achieve a good neutralization effect; the effluent water quality is stable, which is conducive to the operation of subsequent processes, and thus it is widely used.

[0004] The filter media in the filtration and neutralization tank neutralizes the wastewater after contact. Traditional filtration and neutralization tanks often use a fixed amount of filter media. When the wastewater volume fluctuates, if the wastewater volume is large, the fixed filter media cannot fully contact the wastewater and complete the neutralization reaction, resulting in substandard effluent quality that cannot meet discharge or subsequent treatment requirements. Furthermore, when the wastewater volume is small, the continued use of large amounts of filter media not only wastes filter media resources but also increases filtration resistance, leading to increased energy consumption and treatment costs. This is also detrimental to the efficient operation and long-term maintenance of the equipment. Summary of the Invention

[0005] In order to make up for the shortcomings of the existing technology, the present invention proposes a vinylene carbonate production wastewater treatment system and treatment method. The present invention changes the height of the neutralization material in the neutralization tower with the change of the wastewater inlet amount through the lower perforated plate in the neutralization tower, so that the height of the neutralization material in the neutralization tower can adapt to the change of the wastewater amount, thereby ensuring the neutralization effect of the wastewater while improving the wastewater flow efficiency.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a vinylene carbonate production wastewater treatment system described in the present invention comprises a neutralization tower and a bracket at the bottom of the neutralization tower; a liquid inlet joint is provided at the top of the neutralization tower, and a liquid outlet joint is provided at the bottom of the neutralization tower; a through groove is provided outwardly at the upper position of the inner wall of the neutralization tower; the outer wall of the neutralization tower is tightened with an annular avoidance shell by a first bolt; the avoidance shell can block the through groove; the inner wall of the neutralization tower is fixedly connected to the upper hole plate above the through groove; the inner wall of the neutralization tower is movably connected to the lower hole plate below the through groove; a first spring is passed between the lower surface of the lower hole plate and the inner bottom wall of the neutralization tower; a plurality of folding sleeves are provided between the upper hole plate and the lower hole plate; the plurality of folding sleeves are movably and sealedly connected to each other; the innermost folding sleeve is connected to the upper hole plate upward, and the outermost folding sleeve is sealed and fixedly connected to the lower hole plate at the lower end; the neutralization material is filled between the upper hole plate and the lower hole plate.

[0007] Preferably, a sliding groove is provided radially on the upper inner wall of the avoidance shell; a slider is slidably connected in the sliding groove; the side of the slider away from the folding sleeve and the end of the sliding groove away from the folding sleeve are connected by a second spring; the lower surface of the slider is connected to an arc-shaped avoidance plate.

[0008] Preferably, the upper end of the avoidance plate is rotatably connected to the slider via a torsion spring; and adjacent avoidance plates on the inner circumferential side of the avoidance shell overlap each other.

[0009] Preferably, the center of the lower surface of the lower hole plate is rotatably connected to the upper spring seat; the first spring is fixedly connected to the upper spring seat at the upper end and fixedly connected to the lower spring seat at the lower end; a second bolt is provided downwardly through the lower spring seat; the second bolt is threaded and sealed with the neutralization tower.

[0010] Preferably, the inner wall of the folding sleeve is provided with a spiral groove; the inner wall of the spiral groove is movably sealed to a movable block; the movable block is fixedly connected to the outer wall of the corresponding folding sleeve; and adjacent folding sleeves are connected by spiral transmission and sealing.

[0011] Preferably, an elastic spiral plate is provided between the upper orifice plate and the lower orifice plate; the spiral plate is fixedly connected to the upper surface of the lower orifice plate at its lower end; and a through hole is provided on the spiral plate.

[0012] Preferably, triangular ribs are provided on the lower surface of the upper hole plate along the radial direction; a plurality of the triangular ribs are evenly distributed around the center of the upper hole plate; and the upper end of the spiral plate is connected to a vertical rod.

[0013] Preferably, the specifications of the triangular strips increase as they move away from the center of the upper hole plate; an adjustment groove is provided on the outer wall of the vertical rod; the upper end of the spiral plate is inserted into the adjustment groove; and the adjustment groove is threaded downwardly and connected to a third bolt.

[0014] A method for treating vinylene carbonate production wastewater, which is applicable to the above-mentioned vinylene carbonate production wastewater treatment system, comprises the following steps:

[0015] S1. Pretreatment: The wastewater is first cooled to about 25°C by a heat exchanger and then enters a neutralization tower for neutralization to adjust the water quality and quantity;

[0016] S2, primary filtration: The wastewater after heat exchange and acidification in S1 has a suspended solids content of 5000-30000 mg / L. After entering the tubular ultrafiltration membrane for filtration, the suspended solids in the produced water are reduced to below 500 mg / L, ensuring the continuous and stable operation of the entire system; the concentrated water enters the plant incinerator for incineration and disposal;

[0017] S3, secondary membrane separation: The filtrate separated in S2 enters the disc-tube nanofiltration unit, and sodium chloride and water pass through the membrane element to obtain a pure sodium chloride solution; triethylamine and other pollutants are intercepted and concentrated to obtain reduced concentrated water;

[0018] S4, evaporation and resource utilization: The pure sodium chloride solution in the above S3 enters the evaporation system, and the obtained crystalline salt reaches the purity of industrial-grade sodium chloride, realizing resource utilization; the evaporated water enters the biochemical system for treatment; the concentrated water enters the plant incinerator for incineration disposal.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The present invention changes the height of the neutralization material in the neutralization tower with the change of the amount of wastewater entering the neutralization tower through the lower hole plate, so that the height of the neutralization material in the neutralization tower can adapt to the change of the amount of wastewater, thereby ensuring the neutralization effect of the wastewater while improving the wastewater flow efficiency.

[0021] 2. The present invention adjusts the elastic force of the first spring so that when the same amount of wastewater enters the neutralization tower, the amount of neutralizing material in the neutralization chamber can be adjusted, thereby expanding the application range of the neutralization tower and making wastewater treatment more flexible.

[0022] 3. The present invention rotates the spiral plate along with the up and down movement of the lower hole plate, so that the neutralization material in the neutralization chamber can be smoothly reduced and replenished, thereby meeting the change demand of the neutralization material in the neutralization chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 It is a three-dimensional diagram of the neutralization tower of the present invention;

[0025] Figure 2 yes Figure 1 Axial cross-sectional view of

[0026] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 yes Figure 2 Enlarged view of point B in the middle;

[0028] Figure 5 yes Figure 1 Radial cross-sectional view;

[0029] Figure 6 It is a position diagram of the through slot in the present invention;

[0030] Figure 7 yes Figure 6 Enlarged view of point C in the middle;

[0031] Figure 8 It is a three-dimensional diagram of the spiral plate of the present invention;

[0032] Figure 9 It is a flow chart of the processing method in the present invention.

[0033] In the figure: 1. Neutralizing tower; 11. Bracket; 12. Liquid inlet connector; 13. Liquid outlet connector; 14. Through slot; 2. Avoidance shell; 21. First bolt; 22. Slide slot; 23. Slider; 24. Second spring; 25. Avoidance plate; 26. Torsion spring; 3. Upper hole plate; 31. Triangular bar; 4. Lower hole plate; 41. First spring; 42. Upper spring seat; 43. Lower spring seat; 44. Second bolt; 5. Folding sleeve; 51. Spiral groove; 52. Movable block; 6. Spiral plate; 61. Through hole; 62. Vertical rod; 63. Adjustment slot; 64. Third bolt. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0035] like Figures 1 to 9 As shown, the present invention includes the following embodiments:

[0036] Example 1: A vinylene carbonate production wastewater treatment system, comprising a neutralization tower 1 and a bracket 11 at the bottom of the neutralization tower 1; a liquid inlet joint 12 is provided at the top of the neutralization tower 1, and a liquid outlet joint 13 is provided at the bottom of the neutralization tower 1; a through groove 14 is provided on the upper part of the inner wall of the neutralization tower 1 facing outward; an annular avoidance shell 2 is tightened to the outer wall of the neutralization tower 1 by a first bolt 21; the avoidance shell 2 can cover the through groove 14; the inner wall of the neutralization tower 1 is fixedly connected to the through groove 14. The upper orifice plate 3 is provided; the inner wall of the neutralization tower 1 is movably connected to the lower orifice plate 4 below the through groove 14; a first spring 41 is passed between the lower surface of the lower orifice plate 4 and the inner bottom wall of the neutralization tower 1; a plurality of folding sleeves 5 are provided between the upper orifice plate 3 and the lower orifice plate 4; the plurality of folding sleeves 5 are movably and sealedly connected to each other; the innermost folding sleeve 5 is upwardly connected to the upper orifice plate 3, and the outermost folding sleeve 5 is sealed and fixedly connected to the lower orifice plate 4 by the lower end; the neutralization material is filled between the upper orifice plate 3 and the lower orifice plate 4.

[0037] Before putting the neutralization tower 1 into use, first screw the first bolt 21. After the first bolt 21 is screwed, it will move out of the corresponding threaded hole on the outer wall of the neutralization tower 1, so that the end of the first bolt 21 is out of contact with the outer wall of the neutralization tower 1, thereby unlocking the avoidance shell 2. Then, the avoidance shell 2 on the outer wall of the neutralization tower 1 is controlled to move downward to expose the through groove 14. Then, the neutralization material is poured into the through groove 14. Then, the avoidance shell 2 is controlled to move upward. After the avoidance shell 2 moves upward, it will cover the through groove 14. Then, the first bolt 21 is tightened. After the end of the first bolt 21 is screwed, it will be inserted into the threaded hole on the outer wall of the neutralization tower 1, thereby locking the avoidance shell 2. Then, the wastewater pipe is connected to the liquid inlet joint 12 at the top of the neutralization tower 1. Then the wastewater is controlled to enter the top inner side of the neutralization tower 1 along the wastewater pipe and the liquid inlet joint 12, an upper cavity is formed between the upper surface of the upper hole plate 3 and the inner wall of the top of the neutralization tower 1, and a lower cavity is formed between the lower surface of the lower hole plate 4 and the inner wall of the bottom of the neutralization tower 1. The wastewater will enter the upper cavity through the liquid inlet joint 12, and the wastewater in the upper cavity will pass through the holes on the upper hole plate 3 directly into the space between the upper hole plate 3 and the lower hole plate 4, forming a neutralization cavity between the upper hole plate 3 and the lower hole plate 4. The wastewater contacts the neutralizing material in the neutralization cavity in the neutralization cavity to achieve a neutralization reaction of the wastewater. The neutralized wastewater will pass through the lower hole plate 4 into the lower cavity and finally be discharged along the liquid outlet joint 13. When the amount of wastewater in the upper cavity increases, the wastewater in the upper cavity will be discharged. The wastewater pressure will increase, and the wastewater will enter the inner side of the innermost folding sleeve 5. The multiple folding sleeves 5 will expand under the action of the wastewater pressure in the folding sleeves 5. The multiple folding sleeves 5 will drive the lower hole plate 4 to move downward during the expansion process. The distance between the lower hole plate 4 and the upper hole plate 3 will increase during the downward movement of the lower hole plate 4. When the height of the neutralization cavity increases, the neutralizing material inside the avoidance shell 2 will be supplemented in the neutralization cavity, so that the placement height of the neutralizing material in the entire neutralization cavity increases. In this way, when the wastewater in the upper cavity increases, the wastewater can pass through a higher height, that is, more neutralizing material, so that the wastewater can be fully neutralized, ensuring the neutralization effect of the wastewater; the gravity of the neutralizing material in the neutralization cavity will be transmitted to the first spring through the lower hole plate 4. 41, the lower hole plate 4 will overcome the elastic force of the first spring 41 during the downward movement. When the amount of wastewater in the upper chamber decreases, the wastewater pressure in the upper chamber decreases, and the first spring 41 will push the lower hole plate 4 to move upward. During the upward movement of the lower hole plate 4, the multiple folding sleeves 5 will be folded. During the upward movement of the lower hole plate 4, the neutralizing material in the neutralization chamber will be driven to move upward, and the excess neutralizing material will enter the avoidance shell 2 along the through groove 14 for avoidance. In this way, the height of the neutralization chamber becomes shorter and the neutralizing material in the neutralization chamber becomes less. In this way, the height of the neutralization material in the neutralization chamber is adapted to the amount of wastewater, thereby ensuring the flow efficiency of the wastewater. This is repeated, and the lower hole plate 4 will change with the amount of wastewater entering the neutralization tower 1.

[0038] The present invention changes the lower perforated plate 4 in the neutralization tower 1 as the amount of wastewater entering changes, so that the height of the neutralization material in the neutralization tower 1 can adapt to the change of the wastewater amount, thereby ensuring the neutralization effect of the wastewater while improving the wastewater flow efficiency.

[0039] Example 2: A sliding groove 22 is radially provided on the upper inner wall of the avoidance shell 2; a slider 23 is slidably connected in the sliding groove 22; the side of the slider 23 away from the folding sleeve 5 and the end of the sliding groove 22 away from the folding sleeve 5 are connected by a second spring 24; the lower surface of the slider 23 is connected to an arc-shaped avoidance plate 25.

[0040] In this embodiment, the upper end of the avoidance plate 25 is rotatably connected to the slider 23 via a torsion spring 26 ; adjacent avoidance plates 25 on the inner circumferential side of the avoidance shell 2 overlap each other.

[0041] During the upward movement of the lower hole plate 4, the lower hole plate 4 will support the neutralizing material in the neutralizing chamber and move it upward. The neutralizing material in the neutralizing chamber will be squeezed. The neutralizing material inside the neutralizing chamber and around the through groove 14 will be pressed to pass through the through groove 14 and enter the inner side of the shielding shell. The neutralizing material will squeeze the avoidance plate 25 during the process of entering the inner side of the shielding shell. The avoidance plate 25 will drive the slider 23 along the slide groove 22 and away from the folding sleeve 5 during the pressure process. The slider 23 will overcome the elastic force of the second spring 24 during the process of moving along the slide groove 22. The plate 25 will expand outwards when under pressure, thereby making room for the entry of the neutralizing material. The gas inside the avoidance shell 2 will flow out along the gaps between the adjacent avoidance plates 25 under pressure, and impact the neutralizing material entering the inner side of the avoidance shell 2, so that the residual liquid on the neutralizing material is washed away, and the amount of wastewater contained in the neutralizing material entering the avoidance shell 2 is reduced as much as possible. During the process of multiple avoidance plates 25 expanding outwards, the adjacent avoidance plates 25 remain overlapped under the action of the torsion spring 26, so that the multiple avoidance plates 25 can block the neutralizing material and prevent the neutralizing material from crossing the avoidance plate 25 and entering the outer side of the avoidance plate 25. The avoidance plate 25 will change with the sliding of the slider 23 to ensure that adjacent avoidance plates 25 overlap each other. When the lower hole plate 4 moves downward, the distance between the lower hole plate 4 and the upper hole plate 3 increases. When the space in the neutralization cavity becomes larger, the avoidance plate 25 moves inward under the elastic force of the second spring 24. The second spring 24 will push the slider 23 to slide in the slide groove 22 and approach the folding sleeve 5. The slider 23 will drive the avoidance plate 25 to push the neutralizing material in the avoidance shell 2. The neutralizing material in the avoidance shell 2 is pushed by the avoidance plate 25 through the through slot 14 into the neutralization chamber for timely replenishment to meet the change demand of the neutralization material in the neutralization chamber; this embodiment is connected to the avoidance plate 25 by elastic sliding in the avoidance shell 2, so that the neutralizing material can be avoided when the lower hole plate 4 moves upward, and the neutralizing material can be replenished in time when the lower hole plate 4 moves downward to meet the wastewater filtration needs.

[0042] Example 3: The center of the lower surface of the lower hole plate 4 is rotatably connected to the upper spring seat 42; the first spring 41 is fixedly connected to the upper spring seat 42 at the upper end and fixedly connected to the lower spring seat 43 at the lower end; a second bolt 44 is provided downwardly through the lower spring seat 43; the second bolt 44 is threaded and sealed with the neutralization tower 1.

[0043] The second bolt 44 is tightened before the neutralization tower 1 is put into use. The second bolt 44 will drive the lower spring seat 43 to move up or down after being tightened. During the upward movement of the lower spring seat 43, the lower spring seat 43 will squeeze the first spring 41, thereby reducing the initial compression length of the first spring 41, thereby increasing the downward resistance of the lower orifice plate 4. In this way, when the same amount of wastewater enters above the upper orifice plate 3, the adaptive amount of neutralizing material in the neutralization chamber becomes less, and during the downward movement of the lower spring seat 43, the initial compression length of the first spring 41 becomes larger, thereby reducing the downward resistance of the lower orifice plate 4. In this way, when the same amount of wastewater enters above the upper orifice plate 3, the adaptive amount of neutralizing material in the neutralization chamber becomes more. In this way, by adjusting the elastic force of the first spring 41, the adaptive amount of neutralizing material in the neutralization chamber can be adjusted when the same amount of wastewater enters the neutralization tower 1, thereby expanding the scope of application of the neutralization tower 1 and making wastewater treatment more flexible.

[0044] Example 4: The inner wall of the folding sleeve 5 is provided with a spiral groove 51; the spiral groove 51 is movably and sealedly connected to a movable block 52; the movable block 52 is fixedly connected to the outer wall of the corresponding folding sleeve 5; adjacent folding sleeves 5 are spirally driven and sealed.

[0045] In this embodiment, an elastic spiral plate 6 is provided between the upper orifice plate 3 and the lower orifice plate 4 ; the spiral plate 6 is fixedly connected to the upper surface of the lower orifice plate 4 at its lower end; and a through hole 61 is provided on the spiral plate 6 .

[0046] During the downward movement of the lower hole plate 4, the lower hole plate 4 will drive the outermost folding sleeve 5 to move downward, and the downward movement of the outermost folding sleeve 5 will pull the multiple folding sleeves 5 on the inner side in turn. The adjacent folding sleeves 5 are spirally driven and sealed. Therefore, after the movable block 52 moves along the corresponding spiral groove 51, the adjacent folding sleeves 5 will produce axial movement and rotate at the same time, which will drive the lower hole plate 4 to rotate. The lower hole plate 4 will rotate during the downward movement, and the rotating lower hole plate 4 will drive the neutralization material on the upper surface to rotate, so that the wastewater flowing out of the upper hole plate 3 is more evenly mixed with the neutralization material in the neutralization chamber. Contact, improve the neutralization effect of wastewater; when the lower hole plate 4 moves up under the push of the first spring 41, the lower hole plate 4 will rotate in the opposite direction, and the neutralization material above will be driven to rotate during the reverse rotation of the lower hole plate 4; further, a spiral plate 6 is fixed to the upper surface of the lower hole plate 4, and the spiral plate 6 will rotate with the rotation of the lower hole plate 4. The spiral plate 6 is equivalent to the auger in the screw extruder. When the lower hole plate 4 moves up and rotates, the rotation of the spiral plate 6 will cause the neutralization material at the lower position of the neutralization chamber to be transported upward, and the neutralization material transported upward will enter the avoidance shell 2 faster for avoidance The cam 6 is rotated to move the screw plate 6 and the cam 6 is rotated to move the screw plate 6. ... and the cam 6 is rotated to move the screw plate 6 and the cam 6 is rotated to move the screw plate 6 and the cam 6 is rotated to move the screw plate 6 and the cam 6 is rotated to move the screw plate 6 and the cam 6 is rotated to move the screw plate 6 and the cam 6 is rotated to move the screw plate 6 and the cam 6 is rotated to move the screw plate 6 and the cam 6 is rotated to move the screw plate 6 The neutralizing material in the cavity increases smoothly, meeting the neutralizing material adjustment demand in the neutralizing cavity; a through hole 61 is provided on the spiral plate 6, so that the wastewater can smoothly pass through the spiral plate 6 and flow from top to bottom; the upper end of the spiral plate 6 in this embodiment is against the lower surface of the upper hole plate 3 through the vertical rod 62, and the space of the spiral plate 6 in the neutralizing cavity changes with the change of the neutralizing cavity; in this embodiment, the spiral plate 6 rotates with the up and down movement of the lower hole plate 4, so that the neutralizing material in the neutralizing cavity can be smoothly reduced and supplemented, thereby meeting the neutralizing material change demand in the neutralizing cavity.

[0047] Example 5: The lower surface of the upper hole plate 3 is provided with triangular ribs 31 along the radial direction; a plurality of the triangular ribs 31 are evenly distributed around the center of the upper hole plate 3; the upper end of the spiral plate 6 is connected to the vertical rod 62.

[0048] In this embodiment, the specifications of the triangular strip 31 increase as it moves away from the center of the upper hole plate 3; the outer wall of the vertical rod 62 is provided with an adjustment groove 63; the upper end of the spiral plate 6 is inserted into the adjustment groove 63; the adjustment groove 63 is threaded downwardly through the third bolt 64.

[0049] During the downward movement of the lower hole plate 4, the lower hole plate 4 will rotate under the movement of the spiral groove 51 and the movable block 52, and the rotation of the lower hole plate 4 will drive the spiral plate 6 to rotate. During the rotation of the spiral plate 6, the neutralized material in the neutralization chamber will be transported downward. During the rotation of the spiral plate 6, the vertical rod 62 will move on the lower surface of the upper hole plate 3 near the upper end, and the vertical rod 62 will pass through the triangular bar 31. In the process of the vertical rod 62 passing through the triangular bar 31, the spiral plate 6 will be compressed. After the vertical rod 62 passes over the triangular bar 31, it has The elastic spiral plate 6 will expand its own pitch, so that the spiral plate 6 will vibrate during the rotation process. The vibrating spiral plate 6 will keep the neutralized material in the neutralization chamber loose, preventing the neutralized material from being stuck between the spiral gaps of the spiral plate 6 and affecting the transportation, and preventing the neutralized material from being too compacted and affecting the transportation of the neutralized material, and also preventing the neutralized material from being too compacted and affecting the passage of wastewater. During the upward movement of the lower hole plate 4, the vertical rod 62 will also intermittently pass over the triangular bar 31, so that the spiral plate 6 will also vibrate while rotating, with the same effect as above.

[0050] In addition, the third bolt 64 can be loosened to unlock the vertical rod 62 at the upper end of the spiral plate 6, and then the vertical rod 62 can be controlled to move closer to or away from the folding sleeve 5, thereby changing the position of the vertical rod 62 connected to the upper end of the spiral plate 6, and then the third bolt 64 can be tightened to lock the position of the vertical rod 62. The closer the vertical rod 62 is to the folding sleeve 5, the smaller the specification of the triangular strip 31 that the vertical rod 62 passes through, so that the amplitude of the spiral plate 6 is smaller, and vice versa, the amplitude is larger, so that the amplitude of the spiral plate 6 can be adjusted to meet the needs of different types of neutralizers, and the scope of application is further improved.

[0051] Example 6: A method for treating vinylene carbonate production wastewater, which is applicable to the above-mentioned vinylene carbonate production wastewater treatment system, and the steps of the method are as follows:

[0052] S1. Pretreatment: The wastewater is first cooled to about 25°C by a heat exchanger and then enters the neutralization tower 1 for neutralization to adjust the water quality and quantity;

[0053] S2, primary filtration: The wastewater after heat exchange and acidification in S1 has a suspended solids content of 5000-30000 mg / L. After entering the tubular ultrafiltration membrane for filtration, the suspended solids in the produced water are reduced to below 500 mg / L, ensuring the continuous and stable operation of the entire system; the concentrated water enters the plant incinerator for incineration and disposal;

[0054] S3, secondary membrane separation: The filtrate separated in S2 enters the disc-tube nanofiltration unit, and sodium chloride and water pass through the membrane element to obtain a pure sodium chloride solution; triethylamine and other pollutants are intercepted and concentrated to obtain reduced concentrated water;

[0055] S4, evaporation and resource utilization: The pure sodium chloride solution in the above S3 enters the evaporation system, and the obtained crystalline salt reaches the purity of industrial-grade sodium chloride, realizing resource utilization; the evaporated water enters the biochemical system for treatment; the concentrated water enters the plant incinerator for incineration disposal.

[0056] This embodiment provides a treatment method based on tubular membranes, disc-tube membranes, and evaporators to address the problems of current wastewater treatment methods, such as large amounts of evaporated water, high energy consumption, inability to recycle waste salt, and poor biodegradability of evaporated water.

[0057] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0058] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A vinylene carbonate production wastewater treatment system, comprising a neutralization tower and a support at the bottom of the neutralization tower; the top of the neutralization tower is provided with a liquid inlet joint, and the bottom of the neutralization tower is provided with a liquid outlet joint; characterized in that: The neutralization tower inner wall is provided with a through slot facing outward at an upper position; the outer wall of the neutralization tower is tightened with an annular avoidance shell by a first bolt; the avoidance shell can block the through slot; the inner wall of the neutralization tower is fixedly connected to the upper hole plate above the through slot; the inner wall of the neutralization tower is movably connected to the lower hole plate below the through slot; a first spring is passed between the lower surface of the lower hole plate and the inner bottom wall of the neutralization tower; a plurality of folding sleeves are provided between the upper hole plate and the lower hole plate; the plurality of folding sleeves are movably and sealedly connected to each other; the innermost folding sleeve is connected to the upper hole plate upward, and the outermost folding sleeve is sealed and fixedly connected to the lower hole plate at the lower end; the space between the upper hole plate and the lower hole plate is filled with neutralizing material; The avoidance shell is provided with a sliding groove along the radial direction on the upper inner wall; a slider is slidably connected in the sliding groove; a side of the slider away from the folding sleeve and an end of the sliding groove away from the folding sleeve are connected by a second spring; the lower surface of the slider is connected to an arc-shaped avoidance plate; The upper end of the avoidance plate is rotatably connected to the slider through a torsion spring; adjacent avoidance plates on the inner circumferential side of the avoidance shell are overlapped with each other.

2. A vinylene carbonate production wastewater treatment system according to claim 1, characterized in that: The center of the lower surface of the lower hole plate is rotatably connected to the upper spring seat; the upper end of the first spring is fixedly connected to the upper spring seat, and the lower end is fixedly connected to the lower spring seat; a second bolt is provided downwardly through the lower spring seat; the second bolt is threaded and sealed with the neutralization tower.

3. A vinylene carbonate production wastewater treatment system according to claim 2, characterized in that: The inner wall of the folding sleeve is provided with a spiral groove; the inner wall of the spiral groove is movably and sealably connected to a movable block; the movable block is fixedly connected to the outer wall of the corresponding folding sleeve; and adjacent folding sleeves are spirally and sealably connected.

4. A vinylene carbonate production wastewater treatment system according to claim 3, characterized in that: An elastic spiral plate is provided between the upper orifice plate and the lower orifice plate; the spiral plate is fixedly connected to the upper surface of the lower orifice plate at its lower end; and a through hole is provided on the spiral plate.

5. A vinylene carbonate production wastewater treatment system according to claim 4, characterized in that: The lower surface of the upper hole plate is provided with triangular ribs along the radial direction; a plurality of the triangular ribs are evenly distributed around the center of the upper hole plate; the upper end of the spiral plate is connected to the vertical rod.

6. A vinylene carbonate production wastewater treatment system according to claim 5, characterized in that: The specifications of the triangular strips increase as they move away from the center of the upper hole plate; an adjustment groove is provided on the outer wall of the vertical rod; the upper end of the spiral plate is inserted into the adjustment groove; and a third bolt is threaded downward through the adjustment groove.

7. A method for treating vinylene carbonate production wastewater, the method being applicable to the vinylene carbonate production wastewater treatment system according to any one of claims 1 to 6, characterized in that: The steps of this method are as follows: S1. Pretreatment: The wastewater is first cooled to 25°C by a heat exchanger and then enters a neutralization tower for neutralization to adjust the water quality and quantity; S2, primary filtration: The wastewater after heat exchange and acidification in S1 has a suspended solids content of 5000-30000 mg / L. After entering the tubular ultrafiltration membrane for filtration, the suspended solids in the produced water are reduced to below 500 mg / L; the concentrated water enters the plant incinerator for incineration disposal; S3, secondary membrane separation: The filtrate separated in S2 enters the disc-tube nanofiltration unit, and sodium chloride and water pass through the membrane element to obtain a pure sodium chloride solution; triethylamine and other pollutants are intercepted and concentrated to obtain reduced concentrated water; S4, evaporation and resource utilization: the purified sodium chloride solution in S3 enters the evaporation system, and the resulting crystallized salt reaches industrial grade sodium chloride purity; the distilled water enters the biochemical system for treatment; The concentrated water enters the factory incinerator for incineration.

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