NMP waste liquid storage bin odor gas timely treatment device

Abstract

The present application relates to a kind of NMP waste liquid storage bin peculiar smell gas and timely processing device, including ton barrel stored in storage bin and gas purification device, gas purification device includes suction arm sealed to the outer wall of ton barrel, suction arm is fixedly provided with reflux pipeline system, reflux pipeline system is set to the top of ton barrel, the other end of reflux pipeline system is connected with first air pipe, first air pipe is communicated to processing tower, water layer, spray pipe and adsorption layer are sequentially arranged in processing tower from bottom to top, first air pipe end is inserted into water layer, one end of spray pipe penetrates the lateral wall of processing tower and is communicated with water layer, circulation water pump and filter are arranged on the spray pipe outside processing tower, second air pipe is communicated on the lateral wall of processing tower above adsorption layer, the end of second air pipe is communicated with DDBD plasma processor, the peculiar smell gas generated by NMP waste liquid in storage bin can be treated and the purified gas is discharged, to avoid the existence of waste gas harmful to human body in storage bin.

Description

Technical Field

[0001] This invention relates to a device for timely treatment of odorous gases from an NMP waste liquid storage tank, belonging to the technical field. Background Technology

[0002] N-Methylpyrrolidone, also known as NMP, is a colorless, transparent, oily liquid with a slight amine odor. It has low volatility, excellent thermal and chemical stability, and is hygroscopic, evaporating with water vapor. N-Methylpyrrolidone is widely used in industries such as lithium batteries, pharmaceuticals, pesticides, pigments, cleaning agents, and insulating materials.

[0003] NMP waste liquid volatilizes and produces odorous gases at temperatures above 80°C, which are harmful to the human body. When freshly processed NMP waste liquid is temporarily stored in ton containers awaiting recycling, there is a risk of leakage, which causes odors to be present in the storage silo. Therefore, it is very meaningful to design a device that can treat the odorous gases produced by NMP waste liquid in the storage silo. Summary of the Invention

[0004] In order to solve the above-mentioned problems in the prior art, the present invention provides an odor gas timely treatment device for NMP waste liquid storage tank, which can treat the odor gas generated by NMP waste liquid in the storage tank and discharge the purified gas, so as to avoid the presence of waste gas that is harmful to human health in the storage tank.

[0005] The technical solution of the present invention is as follows:

[0006] An odor gas treatment device for an NMP waste liquid storage tank includes a ton container and a gas purification device stored inside the storage tank. The ton container stores NMP waste liquid. The gas purification device includes an air suction arm that is sealed and tightly fitted to the outer wall of the ton container. A return pipeline system is fixedly installed at the other end of the air suction arm. The return pipeline system is vertically installed above the ton container. The other end of the return pipeline system is connected to a first vent pipe, which is connected to a treatment tower. The treatment tower has a water layer, a spray pipe, and an adsorption layer arranged sequentially from bottom to top. The end of the first vent pipe is inserted into the water layer. Several atomizing nozzles are installed at the bottom of the spray pipe. One end of the spray pipe penetrates the side wall of the treatment tower and is connected to the water layer. A circulating water pump and a filter are installed on the spray pipe located outside the treatment tower. A second vent pipe is connected to the side wall of the treatment tower above the adsorption layer. The end of the second vent pipe is connected to a DDBD plasma processor. An exhaust port is provided at the top of the DDBD plasma processor.

[0007] The reflux pipeline system includes an inner tube fixedly installed above the suction arm. A waterproof and breathable microporous membrane is installed at the top of the inner tube. Several tightly connected one-way valves are fixedly installed around the outer wall of the inner tube. A condenser tube is sleeved on the outside of the one-way valve. The inner wall of the condenser tube and the outer wall of the inner tube form a reflux path. A recovery tray is connected to the bottom of the condenser tube. A reflux outlet is provided at the bottom of the recovery tray.

[0008] The inner tube, condenser tube, first vent pipe and second vent pipe are all equipped with blowers.

[0009] The inner tube is provided with a first port valve at the opening on the side connected to the suction arm, the processing tower is provided with a second port valve at the opening connected to the second ventilation pipe, and the exhaust port of the DDBD plasma processor is provided with a third port valve. NMP gas concentration detectors are provided at the top of the suction arm, the top of the processing tower, and the top of the DDBD plasma processor. The three NMP gas concentration detectors are respectively connected to the electrically controlled opening and closing of the first, second, and third port valves.

[0010] The suction arm includes a detection ring at the top, which is fixed below the first pipe opening. The suction arm is fixedly connected to the inner pipe through the detection ring. Several electric push rods are arranged in a circumferential array around the detection ring. The detection ring is electrically connected to the electric push rods to control their extension and retraction. A splicing block is hinged to the end of each electric push rod. Adjacent splicing blocks are axially hinged. The detection ring is used to detect the shape of the ton container and, by changing the length of the electric push rods, causes the splicing blocks to form a shape that conforms to the ton container. Each splicing block is provided with a folding curtain at the bottom. An L-shaped block is provided at the bottom of the folding curtain. A water inlet is opened on the side wall of the L-shaped block. Adjacent L-shaped blocks are hinged. The entire suction arm is covered with an elastic sealing cloth. The entire L-shaped block is pressed tightly against the ton container. Under the sealing of the elastic sealing cloth, the entire L-shaped block and the ton container form an annular water storage tank. A waterproof and breathable membrane is provided on the upper wall of the annular water storage tank.

[0011] The spray pipe is equipped with a motor fixed at the top, and the output shaft of the motor is connected to a stirring rod, which is used to stir the water layer to accelerate the hydrolysis of NMP waste gas.

[0012] A certain amount of NaOH is added to the water layer to make the entire water layer alkaline.

[0013] The outer wall of the water layer in the treatment tower is covered with a heating pad, which controls the water layer temperature to be maintained at 120°C.

[0014] An air purifier is installed on the second ventilation pipe.

[0015] The waterproof and breathable microporous membrane has an upward arc-shaped protrusion.

[0016] The present invention has the following beneficial effects:

[0017] This device treats NMP waste gas in three stages, effectively removing and purifying it from the warehouse. The first stage recycles the waste gas into a liquid that can be further processed. The liquid is then absorbed through condensation, hydrolysis, adsorption, and DDBD low-temperature plasma waste gas treatment technology, which greatly removes NMP waste gas and prevents workers from being inhaled and posing a hazard. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the reflux pipeline system structure of the present invention;

[0020] Figure 3 This is a schematic top view of the internal square structure of the suction arm of the present invention;

[0021] Figure 4 This is a schematic top view of the internal circular structure of the suction arm of the present invention;

[0022] Figure 5 This is a schematic diagram of the lower end of the suction arm tightening and sealing the ton container of the present invention.

[0023] The reference numerals in the figure are as follows:

[0024] 1. Tank; 2. Suction arm; 3. First vent pipe; 4. Treatment tower; 5. Water layer; 6. Spray pipe; 7. Adsorption layer; 8. Atomizing nozzle; 9. Circulating water pump; 10. Filter; 11. Second vent pipe; 12. DDBD plasma processor; 13. Exhaust port; 14. Inner pipe; 15. Waterproof and breathable microporous membrane; 16. One-way valve; 17. Condenser pipe; 18. Recovery tray; 19. Return outlet; 20. Blower; 21. First inlet valve; 22. Second inlet valve; 23. Third inlet valve; 24. NMP gas concentration detector; 25. Stirring rod; 26. Heating pad; 27. Air purifier; 28. Detection ring; 29. ​​Electric push rod; 30. Interlocking block; 31. Folding curtain; 32. L-shaped block; 33. Water inlet; 34. Waterproof and breathable membrane; 35. Waterproof gasket. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0026] Please see Figures 1 to 4 The invention provides a technical solution:

[0027] A device for timely treatment of odorous gases from an NMP waste liquid storage tank includes a bulk container 1 and a gas purification device. NMP waste liquid is temporarily stored inside the bulk container 1. When workers store the bulk container 1 in the storage tank, leakage may occur, causing the NMP waste liquid inside the bulk container 1, which is still at a relatively high temperature, to vaporize and form waste gas with a strong odor and harmful to human health. The gas purification device includes a suction arm 2 that is fitted onto the outside of the bulk container 1. The lower end of the suction arm 2 is fitted over the outside of the bulk container 1 and tightened, effectively collecting the leaked odorous gas.

[0028] An inner tube 14 is connected above the suction arm 2. Odorous gases rise from the inner tube 14 until they enter the condenser tube 17 fitted outside the inner tube 14. A gap exists between the condenser tube 17 and the inner tube 14, forming a return path. The condenser tube 17 and the inner tube 14 are connected by a one-way valve 16 located in the gap. Simultaneously, a waterproof and breathable microporous membrane 15, convex upwards in an arc shape, is installed at the top of the inner tube 14. When the odorous gases rise to the condenser tube 17, they rapidly cool and condense into a return waste liquid. This waste liquid is blocked by the waterproof and breathable microporous membrane 15 and flows to both sides. The waste liquid flows back into the return path and into the recovery tray 18 located at the bottom of the condenser tube 17. The recovery tray 18 is located above the bottom opening of the inner tube 14. The bottom of the recovery tray 18 is provided with a return outlet 19, which can be opened to collect the returned waste liquid. The above steps are the first step of odor gas treatment, which can remove a portion of the NMP waste gas. The remaining NMP waste gas flows into the water layer 5 at the bottom of the treatment tower 4 through the first vent pipe 3 connected to the condenser tube 17. Taking advantage of the fact that NMP is easily soluble in water, the waste gas is further absorbed.

[0029] The treatment tower 4 contains, from bottom to top, a water layer 5, a spray pipe 6, and an adsorption layer 7. A water outlet for supplying water to the water layer 5 is located on the side wall of the treatment tower 4. Simultaneously, a measured amount of NaOH is added to the water layer 5 to create an alkaline environment. A heating pad 26 is wrapped around the outer wall of the water layer 5, maintaining its temperature at 120°C. These steps ensure a good hydrolysis rate of NMP in the water layer 5; specifically, the water volume is 1.5 times the amount of NaOH, achieving a hydrolysis rate of 40%. The incompletely hydrolyzed waste gas then continues to rise, and the spray pipe 6 in the middle layer of the treatment tower 4... The atomizing nozzle 8 sprays water downwards to further hydrolyze and block the exhaust gas. One end of the spray pipe 6 penetrates the side wall of the treatment tower 4 and is connected to the water layer 5. A circulating water pump 9 and a filter 10 are installed on the spray pipe 6 located outside the treatment tower 4. The circulating water pump 9 continuously circulates the water in the water layer 5 and sprays it into the atomizing nozzle 8 to form a water circulation. At the same time, the filter 10 is located between the circulating water pump 9 and the treatment tower 4 to filter the pumped water. The adsorption layer 7 located on the upper layer of the treatment tower 4 can be made of materials with adsorption functions such as graphene. The exhaust gas is adsorbed and deodorized again through the adsorption layer 7. The above steps are the second step of odor gas treatment.

[0030] A second ventilation pipe 11 is connected to the side wall of the treatment tower 4 located above the adsorption layer 7. An air purifier 27 is installed on the second ventilation pipe 11. The third step of odor gas treatment is carried out through the second ventilation pipe 11. The end of the second ventilation pipe 11 is connected to a DDBD plasma processor 12. The DDBD plasma processor 12 can effectively decompose VOCs (volatile organic compounds). NMP is also known as 1-methyl-2-pyrrolidone. VOCs can be further divided into 8 categories: alkanes, aromatic hydrocarbons, alkenes, halogenated hydrocarbons, esters, aldehydes, ketones and other compounds. Therefore, NMP is also classified as VOCs. An exhaust port 13 is provided on the top of the DDBD plasma processor 12.

[0031] Blowers 20 are installed inside the inner pipe 14, condenser pipe 17, first vent pipe 3 and second vent pipe 11, and the blowers 20 drive the waste gas to transfer and purify.

[0032] As a preferred embodiment, a first port valve 21 is provided at the opening on the side of the inner tube 14 that connects to the suction arm 2; a second port valve 22 is provided at the opening connecting the treatment tower 4 to the second vent pipe 11; a third port valve 23 is provided at the exhaust port 13 of the DDBD plasma processor 12; and NMP gas concentration detectors 24 are provided at the top of the suction arm 2, the top of the treatment tower 4, and the top of the DDBD plasma processor 12. The three NMP gas concentration detectors 24 correspond to the electrically controlled first port valve 21, second port valve 22, and third port valve 23, respectively. Specifically, in the initial state, the first port valve 21, second port valve 22, and third port valve 23 are all closed, and the highest and lowest values ​​of the NMP gas concentration detector 24 corresponding to the first port valve 21 are set. When the NMP gas concentration detector 24 corresponding to the first port valve 21 detects that the exhaust gas concentration has reached the highest value... First, the first pipe opening 21 is opened. At this time, the blower 20 is in the off state to avoid the blower 20 causing negative pressure and further vaporization of NMP waste liquid. After the waste gas enters the inner pipe 14, when the waste gas concentration is detected to be at the lowest value, the first pipe opening 21 is closed and the blower 20 is started to quickly drive the waste gas forward. After the waste gas is treated in the second step, when the concentration detected by the corresponding NMP gas concentration detector 24 drops to 40% compared with the NMP gas concentration detector 24 in the first step, the NMP gas concentration detector 24 sends a signal to electrically open the second pipe opening 22. Several spray pipes 6 are set up and laid at intervals on the same plane. A motor is fixed on the top of two adjacent spray pipes 6. The output shaft of the motor is connected to a stirring rod 25. The stirring rod 25 passes through the gap between two adjacent spray pipes 6 and extends into the water layer 5. The stirring rod 25 is used to stir the water layer 5 to accelerate the hydrolysis of NMP waste gas.

[0033] Specifically, such as Figure 3 As shown, the suction arm 2 includes a detection ring 28 located at the top. The detection ring 28 is fixed below the first pipe opening 21. The detection ring 28 has a ring-shaped structure to avoid obstructing the exhaust gas from entering the inner pipe 14. The suction arm 2 is fixedly connected to the inner pipe 14 through the detection ring 28. Several electric push rods 29 are arranged in a circumferential array on the detection ring 28. The detection ring 28 is equipped with a scanner to accurately detect the external shape of the ton 1. The ends of the electric push rods 29 are hinged to splicing blocks 30. Adjacent splicing blocks 30 are axially hinged. After the shape is detected by the scanner, the detection ring 28 drives the electric push rods 29 to extend and retract through electrical control, and in turn drives the splicing blocks 30 to form a shape that matches the top view shape of the ton 1, such as... Figure 4As shown, each splicing block 30 has a folding curtain 31 at its bottom, which can be stretched to achieve the desired length. The bottom of the folding curtain 31 has an L-shaped block 32, one of which has a water inlet 33 on its side wall. The water inlet 33 can be a one-way valve or similar structure, allowing water to flow in but not out. Adjacent L-shaped blocks 32 are hinged together. All the above components are structures of the suction arm 2. The suction arm 2 has elastic sealing cloths attached to both its inner and outer sides. One end of the L-shaped block 32 is connected to the folding curtain 31, and the other end is tightly fitted to the outer wall of the ton container 1 via an elastic band. The entire L-shaped block 32, sealed by the elastic sealing cloth, forms an annular water storage tank with the ton container 1. When the suction arm 2 is placed over the ton container 1, the shape of the ton container 1 in its top view is first detected by the detection ring 28, and then the splicing block 30 is used to form a corresponding shape. The folding curtain 31 is then pulled down to the required length, because the splicing block 30 and the ton container 1 are aligned in their top view... Figure 1 Therefore, the L-shaped block 32, which is set in the same longitudinal direction as the splicing block 30, is also consistent with the top view shape of the ton 1. That is, after the detection ring 28 completes the detection, it issues an instruction to the electrically controlled suction arm 2 to form a structure that is consistent with the shape of the ton 1. Because the overall shape of the L-shaped block 32 fits the outer wall of the ton 1, the L-shaped block 32 is tightly attached to the outer wall of the ton 1 by elastic band to form an annular water storage tank. Alternatively, any method that can tightly attach the L-shaped block 32 to the outer wall of the ton 1 can be used. A waterproof and breathable membrane 34 is set on the upper surface of the annular water storage tank to prevent water from flowing out. Alternatively, a water-proof gasket 35 can be wrapped around the bottom of the annular water storage tank on the outer wall of the ton 1 to prevent water from flowing out again. At this time, the water inlet 33 is opened to inject water into the interior until the water flow fills the annular water storage tank. That is, one end of the water flow blocks the outer wall of the ton 1. By taking advantage of the fact that NMP exhaust gas is easily soluble in water, a water seal is achieved to prevent NMP exhaust gas from overflowing from below.

[0034] A certain amount of NaOH is added inside the water layer 5 to make the entire water layer 5 alkaline environment. A heating pad 26 is wrapped on the outer wall of the treatment tower 4 corresponding to the water layer 5. The heating pad 26 controls the temperature of the water layer 5 to be maintained at 120°, which can maximize the hydrolysis degree of NMP waste gas.

[0035] The working principle of the above-mentioned NMP waste liquid storage odor gas timely treatment device is as follows:

[0036] The ton container 1 containing NMP waste liquid is covered by the suction arm 2 and the suction arm 2 is tightened to prevent gas leakage. Initially, the entire device is not started. When the ton container 1 leaks, the concentration of waste gas between the suction arms 2 continuously increases because the first port valve 21 is closed. When the NMP gas concentration detector 24 detects the highest value, it sends an electrical signal to control the opening of the first port valve 21. After a period of time, the concentration decreases and the first port valve 21 is closed. At the same time, the blower 20 starts, driving the waste gas through the first, second and third steps for purification.

[0037] In the first step, the waste gas liquefies after passing through the condenser 17, forming a reflux waste liquid which is collected in the recovery tray 18. It then enters the second step, namely the treatment tower 4, where it undergoes hydrolysis and adsorption using alkaline water at 120°C until the NMP concentration drops to 40% of its initial level. At this point, the second inlet valve 22 is opened, allowing the remaining waste gas to enter the third step for further treatment. Similarly, when the NMP gas concentration detector 24 for the third step detects a value between 0-5 ppm, the exhaust port 13 is opened to release the purified gas. This process is repeated continuously.

[0038] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A device for timely treatment of odorous gases from an NMP waste liquid storage tank, characterized in that: The system includes a ton container (1) stored in a storage silo and a gas purification device. The ton container (1) contains NMP waste liquid. The gas purification device includes a suction arm (2) that is sealed tightly to the outer wall of the ton container (1). A return pipeline system is fixedly installed at the other end of the suction arm (2). The return pipeline system is vertically installed above the ton container (1). The other end of the return pipeline system is connected to a first vent pipe (3). The first vent pipe (3) is connected to a treatment tower (4). The treatment tower (4) has a water layer (5), a spray pipe (6), and an adsorption layer (7) arranged sequentially from bottom to top. The end of the air pipe (3) is inserted into the water layer (5). Several atomizing nozzles (8) are provided at the bottom of the spray pipe (6). One end of the spray pipe (6) penetrates the side wall of the treatment tower (4) and communicates with the water layer (5). A circulating water pump (9) and a filter (10) are provided on the spray pipe (6) located outside the treatment tower (4). A second air pipe (11) is connected to the side wall of the treatment tower (4) above the adsorption layer (7). The end of the second air pipe (11) is connected to the DDBD plasma processor (12). An exhaust port (13) is provided on the top of the DDBD plasma processor (12). The reflux piping system includes an inner tube (14) fixedly installed above the suction arm (2). A waterproof and breathable microporous membrane (15) is installed at the top of the inner tube (14). Several tightly connected one-way valves (16) are fixedly installed around the outer wall of the inner tube (14). A condenser tube (17) is sleeved on the outside of the one-way valve (16). The inner wall of the condenser tube (17) and the outer wall of the inner tube (14) form a reflux path. A recovery tray (18) is connected to the bottom of the condenser tube (17). A reflux outlet (19) is provided at the bottom of the recovery tray (18). An opening is provided on the side of the inner tube (14) that connects to the suction arm (2). A first port valve (21) is provided at the opening of the treatment tower (4) and the second ventilation pipe (11), a second port valve (22) is provided at the opening of the treatment tower (4) and the second ventilation pipe (11), a third port valve (23) is provided at the exhaust port (13) of the DDBD plasma processor (12), and an NMP gas concentration detector (24) is provided at the top of the suction arm (2), the top of the treatment tower (4) and the top of the DDBD plasma processor (12). The three NMP gas concentration detectors (24) are respectively corresponding to the opening and closing of the first port valve (21), the second port valve (22) and the third port valve (23) controlled by electricity.The suction arm (2) includes a detection ring (28) located at the top. The detection ring (28) is fixed below the first pipe opening (21). The suction arm (2) is fixedly connected to the inner pipe (14) through the detection ring (28). The detection ring (28) is arranged in a circumferential array with several electric push rods (29). The detection ring (28) is electrically connected to the electric push rods (29) to control the extension and retraction of the electric push rods (29). The end of the electric push rod (29) is hinged with a splicing block (30). Adjacent splicing blocks (30) are axially hinged. The detection ring (28) is used to detect the shape of the ton (1) by changing the electric... The length of the push rod (29) drives the splicing blocks (30) to form a shape that conforms to the ton container (1); each splicing block (30) is provided with a folding curtain (31) facing downwards, and an L-shaped block (32) is provided at the bottom of the folding curtain (31). The side wall of the L-shaped block (32) is provided with a water inlet (33). Adjacent L-shaped blocks (32) are hinged together. The suction arm (2) is covered with an elastic sealing cloth. The entire L-shaped block (32) is close to the ton container (1). Under the sealing of the elastic sealing cloth, the entire L-shaped block (32) cooperates with the ton container (1) to form an annular water storage tank. The upper wall of the annular water storage tank is provided with a waterproof and breathable membrane (34).

2. The device for timely treatment of odorous gases from an NMP waste liquid storage tank as described in claim 1, characterized in that: Blowers (20) are installed inside the inner tube (14), condenser tube (17), first vent tube (3), and second vent tube (11).

3. The device for timely treatment of odorous gases from an NMP waste liquid storage tank as described in claim 2, characterized in that: A motor is fixedly installed at the top of the spray pipe (6), and the output shaft of the motor is connected to a stirring rod (25). The stirring rod (25) is used to stir the water layer (5) to accelerate the hydrolysis of NMP exhaust gas.

4. The device for timely treatment of odorous gases from an NMP waste liquid storage tank as described in claim 3, characterized in that: A certain amount of NaOH is added to the water layer (5) to make the entire water layer (5) alkaline.

5. The device for timely treatment of odorous gases from an NMP waste liquid storage tank as described in claim 4, characterized in that: The outer wall of the treatment tower (4) corresponding to the water layer (5) is covered with a heating pad (26), which controls the temperature of the water layer (5) to be maintained at 120°.

6. The device for timely treatment of odorous gases from an NMP waste liquid storage tank as described in claim 5, characterized in that: An air purifier (27) is installed on the second ventilation pipe (11).

7. The device for timely treatment of odorous gases from an NMP waste liquid storage tank as described in claim 6, characterized in that: The waterproof and breathable microporous membrane (15) is convex upward in an arc shape.

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