Nitrocellulose acid wastewater filtering device

Abstract

The utility model relates to the technical field of nitrocellulose acid wastewater treatment, and discloses a nitrocellulose acid wastewater filtering device which comprises a sintered wire mesh filter, a circle of fixing frame is fixedly connected to the outer end of the bottom of the sintered wire mesh filter, and supporting frames are vertically and fixedly connected to the two sides of the fixing frame. According to the nitrocellulose acid wastewater filtering device, the filter element, the auxiliary frame, the side plate, the water outlet, the sliding plate and the limiting frame are arranged, so that the filter element can be stably mounted in the sintered wire mesh filter for use, the fixing force of the filter element is ensured, the quick dismounting operation is convenient, and the filter element is made of a high-precision and easy-to-regenerate sintered wire mesh; and the high flux is ensured, and meanwhile, the solid in the wastewater can be completely intercepted. The problems that a traditional filtering device is large in size and high in arrangement space requirement are solved; the filtering process is complicated, filter residue cleaning depends on manpower, and the investment and operation cost is high; the filtering precision is low, and filtering leakage is often caused.

Description

Technical Field

[0001] This utility model relates to the field of nitrated cellulose acidic wastewater treatment technology, specifically a nitrated cellulose acidic wastewater filtration device. Background Technology

[0002] The production of nitrocellulose generates a large amount of acidic wastewater. This acidic wastewater contains some recyclable nitrocellulose with a solid content of 0.1%–0.5% wt and particle size ≥20 micrometers. The current mainstream filtration method involves first using a centrifugal filter for pre-filtration to reduce the solid content of the wastewater, then temporarily storing the pre-filtered slurry in an intermediate tank, and finally performing a secondary filtration using a vibrating filter. Furthermore, the filter residue adhering to the filter screen must be manually cleaned periodically to prevent clogging. This filtration method has the following disadvantages: the equipment is bulky, requiring ample space for layout and lacking flexibility; the filtration process is complex, filter residue cleaning relies on manual labor, resulting in high investment and operating costs; and the filtration accuracy is low, often leading to filtration leakage.

[0003] Therefore, a novel filtration device for acidic nitrocellulose wastewater is proposed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a filtration device for acidic nitrocellulose wastewater to solve the problems mentioned in the background art, such as large equipment size, high space requirements, inflexible layout, complex filtration process, manual cleaning of filter residue, high investment and operating costs, low filtration accuracy, and frequent filtration leakage.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a filtration device for nitrocellulose acidic wastewater, comprising a sintered metal wire mesh filter, wherein a ring of fixing frame is fixedly connected to the outer end of the bottom of the sintered metal wire mesh filter, and support frames are vertically fixedly connected to both sides of the fixing frame; a sealing cover plate is detachably connected to the top of the sintered metal wire mesh filter; a guide tube is horizontally arranged through the bottom left side of the sintered metal wire mesh filter; and a stable and supported filter assembly is arranged inside the sintered metal wire mesh filter.

[0006] The filter assembly includes a filter element located inside a sintered metal wire mesh filter. Side plates are fixedly connected to the top of both sides of the sintered metal wire mesh filter. An auxiliary frame is horizontally arranged at the top of the sintered metal wire mesh filter. The outer end of the top of the filter element is fixedly connected to the inner wall of the auxiliary frame. A water outlet is opened at the top of the filter element. Grooves are opened on both sides outside the water outlet, and sliding plates are fixedly connected inside the grooves. The sliding plates are slidably sleeved on the outside of the side plates.

[0007] As a further technical solution of this utility model, the front end and rear end of the grooves on both sides of the outlet are fixedly connected to a limiting frame. The limiting frame is slidably sleeved on the outside of the side plate, and the outer end of the limiting frame is fixedly connected to the outer end of the slide plate.

[0008] As a further technical solution of this utility model, a left external connector is fixedly connected to the left side inside the sintered metal wire mesh filter, and a right external connector is fixedly connected to the right side inside the sintered metal wire mesh filter. Two sets of guide plates are fixedly connected to the top of both sides of the filter element. Inner sliding grooves are opened on the inner sides of the left and right external connectors. The inner sliding grooves correspond one-to-one with the guide plates, and the outer end of the guide plate and the inner wall of the inner sliding groove form a sliding connection.

[0009] As a further technical solution of this utility model, a base plate is fixedly connected to the outer side of the support frame, and a feeding pump is fixedly connected to the top of the base plate. The conduit passes through the interior of a set of support frames and is fixedly connected to the interior of the feeding pump.

[0010] As a further technical solution of this utility model, the bottom of the sintered metal wire mesh filter is provided with a slag discharge port, the top of the sealing cover is provided with a conveying pipe, the conveying pipe is provided with a filter liquid outlet valve, and the bottom of the conveying pipe is located inside the water outlet.

[0011] As a further technical solution of this utility model, an inlet valve is provided on one side of the conduit, a backflush pipe is vertically provided through the left side of the sealing cover, a backflush valve is provided on one side of the backflush pipe, and the bottom of the backflush pipe penetrates through the top of the sintered metal wire mesh filter.

[0012] As a further technical solution of this utility model, a differential pressure gauge mounting base is fixed on the top of the support frame on the outer right side of the sintered metal wire mesh filter.

[0013] As a further technical solution of this utility model, a differential pressure gauge head is installed on the upper part of the differential pressure gauge mounting base, a low pressure detection port of the differential pressure gauge is provided on the left side, and a high pressure detection port of the differential pressure gauge is provided on the right side. The low pressure detection port of the differential pressure gauge is connected to the lower part of the sintered metal wire mesh filter cylinder through a pressure tapping pipe, and the high pressure detection port of the differential pressure gauge is connected to the delivery pipe through a pressure tapping pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The filter element of this nitrocellulose acidic wastewater filtration device is made of high-precision and easily regenerable sintered metal wire mesh, ensuring high throughput while also guaranteeing 100% interception of solids in the wastewater. The filtration device has a more compact and simpler structure, and the filtration process is also simpler. A single filtration unit can achieve the combination of a centrifugal filter, an intermediate storage tank, and a vibrating filter, and it can also automatically clean the filter cake. Not only does it have low space requirements and lower investment and operating costs, but it also offers high filtration accuracy, no leakage, and higher efficiency.

[0016] In addition, the nitrocellulose acid wastewater filtration device also features easy disassembly and assembly, strong fixation, and safety protection.

[0017] The filter element is located at the top of the sintered metal wire mesh filter, with the outlet facing upwards. The auxiliary frame, which is fixed to the outer end of the top of the filter element, is sleeved on the outside of the two sets of side plates. The filter element is pushed downwards through a sliding connection and installed inside the sintered metal wire mesh filter, ensuring the filter element is firmly fixed. Wastewater passes through the filter element from the outside to the inside. Nitrocellulose solids are intercepted on the outer surface of the filter element to form a filter cake. The filtrate flows out from the top of the outlet and is sent to the wastewater cleaning pit through the conveying pipe.

[0018] By setting up a left external connector, a right external connector, a guide plate, and an inner sliding groove, the guide plate is installed in the corresponding inner sliding groove, which strengthens the connection between the outer end of the filter element and the inner wall of the sintered metal wire mesh filter, effectively preventing the filter element from tilting or falling off during use, improving the safety of the filter element, and at the same time facilitating the push-pull operation of the filter element and optimizing the sliding performance of the filter element.

[0019] By installing a differential pressure gauge mounting base and gauge head, the low-pressure detection port of the differential pressure gauge is connected to the side of the sintered metal wire mesh filter, and the delivery pipe is connected to the high-pressure detection port of the differential pressure gauge. The real-time filtration differential pressure inside the sintered metal wire mesh filter can be detected, and the pressure difference can be accurately sensed. The internal differential pressure of the sintered metal wire mesh filter will increase with the increase of the filter cake layer thickness. When the filter cake layer reaches the set thickness, it can be quickly sensed by the low / high detection port of the differential pressure gauge, and the inlet valve and the filter liquid outlet valve can be quickly closed. At the same time, the backflush valve is opened, and the filter cake falls off under the action of backflush air and is discharged through the bottom slag discharge port. Attached Figure Description

[0020] Figure 1 This is a frontal cross-sectional view of the present invention.

[0021] Figure 2 This is a top view of the filter element structure of this utility model;

[0022] Figure 3 This is a top view of the outlet structure of this utility model;

[0023] Figure 4 For the present utility model Figure 1 A magnified schematic diagram of a partial cross-section at point A in the middle.

[0024] In the diagram: 1. Support frame; 2. Base plate; 3. Feed pump; 4. Inlet valve; 5. Conduit; 6. Fixing frame; 7. Sintered metal wire mesh filter; 8. Left external connector; 9. Sealing cover plate; 10. Backflush valve; 11. Conveying pipe; 12. Backflush pipe; 13. Side plate; 14. Slide plate; 15. Limiting frame; 16. Auxiliary frame; 17. Right external connector; 18. Filter element; 19. Slag discharge port; 20. Guide plate; 21. Inner chute; 22. Water outlet; 23. Differential pressure gauge head; 24. Differential pressure gauge low-pressure detection port; 25. Differential pressure gauge high-pressure detection port; 26. Differential pressure gauge mounting base; 27. Filtrate outlet valve. Detailed Implementation

[0025] 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.

[0026] Please see Figure 1-4 A filtration device for nitrocellulose acidic wastewater includes a sintered metal wire mesh filter 7. A ring of fixing frame 6 is fixedly connected to the outer end of the bottom of the sintered metal wire mesh filter 7. Support frame 1 is vertically fixedly connected to both sides of the fixing frame 6. A sealing cover plate 9 is detachably connected to the top of the sintered metal wire mesh filter 7. A conduit 5 is horizontally arranged through the bottom left side of the sintered metal wire mesh filter 7. A stable and supported filter component is arranged inside the sintered metal wire mesh filter 7.

[0027] The filter assembly includes a filter element 18, which is located inside the sintered metal wire mesh filter 7. Side plates 13 are fixedly connected to the top of both sides of the sintered metal wire mesh filter 7. An auxiliary frame 16 is horizontally arranged at the top of the sintered metal wire mesh filter 7. The outer end of the top of the filter element 18 is fixedly connected to the inner wall of the auxiliary frame 16. A water outlet 22 is opened at the top of the filter element 18. Grooves are opened on both sides of the outside of the water outlet 22, and a sliding plate 14 is fixedly connected inside the groove. The sliding plate 14 is slidably sleeved on the outside of the side plate 13.

[0028] Limiting brackets 15 are fixedly connected to the front and rear ends of the grooves on both sides of the outlet 22. The limiting brackets 15 are slidably sleeved on the outside of the side plate 13, and the outer end of the limiting brackets 15 is fixedly connected to the outer end of the slide plate 14.

[0029] Specifically, such as Figure 1 and Figure 3 As shown, during use, the filter element 18 is located at the top of the sintered metal wire mesh filter 7, and the outlet 22 of the filter element 18 is designed to face upwards. The auxiliary frame 16 fixed at the top outer end of the filter element 18 is sleeved on the outside of the two sets of side plates 13, and the filter element 18 is pushed downwards through a sliding connection to be installed inside the sintered metal wire mesh filter 7 for use, and the fixing force of the filter element 18 is ensured. Wastewater passes through the filter element 18 from the outside to the inside, and the nitrocellulose solids are intercepted on the outer surface of the filter element 18 to form a filter cake. The filtrate flows out from the top of the outlet 22 and is sent to the wastewater cleaning pit through the conveying pipe 11.

[0030] A left external connector 8 is fixedly connected to the left side inside the sintered metal wire mesh filter 7, and a right external connector 17 is fixedly connected to the right side inside the sintered metal wire mesh filter 7. Two sets of guide plates 20 are fixedly connected to the top of both sides of the filter element 18. An inner sliding groove 21 is opened on the inner side of both the left external connector 8 and the right external connector 17. The inner sliding groove 21 corresponds to the guide plate 20 one by one, and the outer end of the guide plate 20 and the inner wall of the inner sliding groove 21 form a sliding connection.

[0031] A base plate 2 is fixedly connected to the outside of the support frame 1, and a feeding pump 3 is fixedly connected to the top of the base plate 2. A conduit 5 passes through the interior of a set of support frames 1 and is fixedly connected to the interior of the feeding pump 3.

[0032] The bottom of the sintered metal wire mesh filter 7 is provided with a slag discharge port 19, and the top of the sealing cover plate 9 is provided with a conveying pipe 11. The conveying pipe 11 is provided with a filter liquid outlet valve 27, and the bottom of the conveying pipe 11 is located inside the water outlet 22.

[0033] Specifically, such as Figure 1 and Figure 2 As shown, during use, the two sets of guide plates 20 are installed in the corresponding inner slide grooves 21 to strengthen the connection between the outer end of the filter element 18 and the inner wall of the sintered metal wire mesh filter 7, effectively preventing the filter element 18 from tilting or falling during use, improving the safety of the filter element 18, and at the same time facilitating the installation of the filter element 18 into the sintered metal wire mesh filter 7.

[0034] An inlet valve 4 is provided on one side of the conduit 5, and a backflush pipe 12 is vertically installed through the left side of the sealing cover plate 9. A backflush valve 10 is provided on one side of the backflush pipe 12, and the bottom of the backflush pipe 12 penetrates the top of the sintered metal wire mesh filter 7.

[0035] A differential pressure gauge mounting base 26 is installed on the top of the right support frame 1. A differential pressure gauge head 23 is installed on the upper part of the differential pressure gauge mounting base 26. A differential pressure gauge low pressure detection port 24 is provided on the left side and a differential pressure gauge high pressure detection port 25 is provided on the right side. The differential pressure gauge low pressure detection port 24 is connected to the lower part of the sintered metal wire mesh filter 7 cylinder through a pressure tapping pipe. The differential pressure gauge high pressure detection port 25 is connected to the conveying pipe 11 through a pressure tapping pipe.

[0036] Specifically, such as Figure 1 and Figure 4 As shown, during use, the low-pressure detection port 24 of the differential pressure gauge is connected to the lower part of the sintered metal wire mesh filter 7 via a pressure tapping pipe, and the high-pressure detection port 25 of the differential pressure gauge is connected to the delivery pipe 11 via a pressure tapping pipe. This allows for the detection of the filtration pressure difference within the sintered metal wire mesh filter 7, accurately sensing pressure changes. The differential pressure gauge head 23 is fixed to the support frame 1 via the differential pressure gauge mounting base 26, enhancing the stability of the differential pressure gauge head 23. The internal pressure difference of the sintered metal wire mesh filter 7 increases with the increase of the filter cake layer thickness. When the filter cake layer reaches the set thickness, it is quickly sensed by the low-pressure detection port 24 and the high-pressure detection port 25 of the differential pressure gauge. The system automatically closes the inlet valve 4 and the filtrate outlet valve 27, while simultaneously opening the backflush valve 10. The filter cake falls off under the action of backflush air and is automatically discharged through the bottom slag discharge port 19.

[0037] Working principle: When this utility model is in use, after the feed pump 3 is turned on, the acidic wastewater of nitrocellulose is introduced into the sintered metal wire mesh filter 7 through the conduit 5. The wastewater passes through the filter element 18 from the outside to the inside, and the nitrocellulose solids are intercepted on the outer surface of the filter element 18 to form a filter cake. The filtrate flows out from the top of the outlet 22 and is sent to the wastewater cleaning pit through the conveying pipe 11. The internal pressure difference of the sintered metal wire mesh filter 7 will increase with the increase of the filter cake layer thickness. When the filter cake layer reaches the set thickness, it can be quickly sensed by the low pressure detection port 24 and the high pressure detection port 25 of the differential pressure gauge, and the inlet valve 4 and the filtrate outlet valve 27 will be quickly closed. At the same time, the backflush valve 10 will be opened. The filter cake will fall off under the action of the backflush air and be discharged through the bottom slag discharge port 19.

[0038] 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.

Claims

1. A nitrocellulose acid waste water filtering device comprising a sintered metal wire mesh filter (7), characterized in that: The outer end of the bottom of the sintered metal wire screen filter (7) is fixedly connected with a ring of fixing frame (6), the two sides of the fixing frame (6) are vertically fixedly connected with support frames (1), the top end of the sintered metal wire screen filter (7) is detachably connected with a sealing cover plate (9), the bottom of the left side of the sintered metal wire screen filter (7) is transversely provided with a conduit (5), and the inside of the sintered metal wire screen filter (7) is provided with a stable supporting filtering assembly; The filtering assembly comprises a filter core (18), the filter core (18) is located in the inside of the sintered metal wire screen filter (7), the top of the two sides in the sintered metal wire screen filter (7) is fixedly connected with side plates (13), a ring of auxiliary frames (16) is transversely arranged at the top end in the inside of the sintered metal wire screen filter (7), the outer end of the top of the filter core (18) is fixedly connected with the inner wall of the auxiliary frame (16), a water outlet (22) is formed in the top of the filter core (18), recesses are formed in the two sides outside the water outlet (22), and the inside of the recesses is fixedly connected with sliding plates (14), and the sliding plates (14) are slidingly sleeved outside the side plates (13).

2. A cellulose nitrate acidic wastewater filtering device according to claim 1, characterized in that: The front end and the rear end of the recesses on the two sides of the water outlet (22) are fixedly connected with limiting frames (15), the limiting frames (15) are slidingly sleeved outside the side plates (13), and the outer end of the limiting frame (15) is fixedly connected with the outer end of the sliding plate (14).

3. The nitrocellulose acidic wastewater filtering device according to claim 1, characterized in that: The left side in the inside of the sintered metal wire screen filter (7) is fixedly connected with a left outer connecting seat (8), the right side in the inside of the sintered metal wire screen filter (7) is fixedly connected with a right outer connecting seat (17), the top of the two sides outside the filter core (18) is fixedly connected with two groups of guide plates (20), the inner side of the left outer connecting seat (8) and the right outer connecting seat (17) is provided with an inner sliding groove (21), the inner sliding groove (21) corresponds to the guide plate (20) one by one, and the outer end of the guide plate (20) and the inner wall of the inner sliding groove (21) form a sliding connection.

4. The nitrocellulose acidic wastewater filtering device according to claim 1, characterized in that: The outer side of the support frame (1) is fixedly connected with a bottom plate (2), the top end of the bottom plate (2) is fixedly connected with a feeding pump (3), the conduit (5) penetrates the inside of a group of support frames (1), and is fixedly connected with the inside of the feeding pump (3).

5. A cellulose nitrate acidic wastewater filtering device according to claim 1, characterized in that: The bottom of the sintered metal wire screen filter (7) is provided with a residue discharging port (19), the top end of the sealing cover plate (9) is provided with a conveying pipe (11), the conveying pipe (11) is provided with a filtered liquid outlet valve (27), and the bottom of the conveying pipe (11) is located in the inside of the water outlet (22).

6. A cellulose nitrate acidic wastewater filtering device according to claim 1, characterized in that: One side of the conduit (5) is provided with an inlet valve (4), the left side of the sealing cover plate (9) is vertically provided with a back flushing pipe (12), one side of the back flushing pipe (12) is provided with a back flushing valve (10), and the bottom of the back flushing pipe (12) penetrates the top of the sintered metal wire screen filter (7).

7. A cellulose nitrate acidic wastewater filtering device according to claim 1, characterized in that: The top of the support frame (1) on the right side of the sintered metal wire screen filter (7) is provided with a differential pressure gauge mounting base (26).

8. A cellulose nitrate acidic wastewater filtering device according to claim 7, characterized in that: The differential pressure gauge is installed on the upper part of the differential pressure gauge mounting base (26), and the left side is provided with a differential pressure gauge low pressure detection port (24), and the right side is provided with a differential pressure gauge high pressure detection port (25), the differential pressure gauge low pressure detection port (24) is connected with the lower part position of the sintered metal wire mesh filter (7) barrel through a pressure lead pipe, and the differential pressure gauge high pressure detection port (25) is connected with the conveying pipe (11) through a pressure lead pipe.

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