Tail gas treatment device for acetonitrile production

Abstract

The utility model discloses a tail gas treatment device for acetonitrile production, which comprises a support table, and two tail gas treatment boxes I and a tail gas treatment box II are respectively arranged at the top of the support table; the bottom of each first tail gas treatment box is of an opening structure, through holes communicating with the first tail gas treatment boxes are formed in the positions, located at the bottoms of the first tail gas treatment boxes, of the bottom of the supporting table, a jacking plate driven by a jacking air cylinder is arranged in each through hole, and a plurality of filtering plates are arranged at the tops of the jacking plates. According to the tail gas treatment device, the two first tail gas treatment boxes can be used in a crossed mode, when one first tail gas treatment box is used for filtering tail gas, a filtering plate of the other first tail gas treatment box is replaced, so that continuous filtering treatment of the tail gas is guaranteed, interruption of filtering treatment is avoided, and the tail gas treatment efficiency is guaranteed; good tail gas treatment continuity can be achieved, and tail gas input does not need to be paused.

Description

Technical Field

[0001] This utility model relates to the field of acetonitrile production technology, specifically to a tail gas treatment device for acetonitrile production. Background Technology

[0002] Acetonitrile is an important organic compound and a multifunctional chemical intermediate. Its physical properties are that of a colorless, transparent liquid with a distinctive pungent odor.

[0003] Acetonitrile production generates some exhaust gas. To avoid direct emission of this exhaust gas, exhaust gas treatment devices are often used to filter it before it is released.

[0004] As mentioned in the Chinese patent application CN202323171575.3 regarding a tail gas treatment device for acetonitrile production: "It includes a first outer shell and a second outer shell. Filter cotton is detachably installed at both ends inside the second outer shell. A first treatment tank is detachably installed inside the second outer shell near one end of the filter cotton. Several circumferentially distributed sieve cottons are fixed to the inner side wall of the first treatment tank. A third treatment tank is detachably installed inside the second outer shell near the other end of the filter cotton. An annular pipe is connected through one end of the third treatment tank. A rotating rod is rotatably connected to the side of the annular pipe near the third treatment tank. This utility model can perform multiple thorough filtration treatments on the tail gas from acetonitrile production through filter cotton, filter plates, sieve cottons, multi-layer filter columns, and cotton rods, thereby improving the tail gas treatment effect."

[0005] Based on our search of the aforementioned patents, we found that this technology still has certain shortcomings:

[0006] In practical use, to avoid the filter material's effectiveness deteriorating with continuous use, it is often necessary to replace or maintain the filter material. However, in the aforementioned technologies, since only one exhaust gas treatment device is installed, the input of exhaust gas must be stopped before the internal filter material can be replaced. That is, the exhaust gas generating equipment must stop inputting exhaust gas into the device. Under this restriction, the exhaust gas filtration will be interrupted, affecting the efficiency of exhaust gas filtration. Furthermore, in the current technology, replacing the filter material is quite troublesome. When there are many filter materials, disassembling and installing them one by one requires a lot of time and effort, which is not conducive to the rapid replacement of filter materials. Utility Model Content

[0007] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a tail gas treatment device for acetonitrile production, comprising a support platform, with two tail gas treatment boxes 1 and one tail gas treatment box 2 respectively disposed on the top of the support platform; the bottom of each tail gas treatment box 1 is an open structure, and a through hole communicating with each tail gas treatment box 1 is provided at the bottom of the support platform and at the bottom position of each tail gas treatment box 1, and a lifting plate driven by a lifting cylinder is disposed in each through hole, with multiple filter plates disposed on the top of the lifting plate; one side of the two tail gas treatment boxes 1 is connected by a U-shaped pipe 1, and the other side of the two tail gas treatment boxes 1 is connected by a U-shaped pipe 2, with valve 1 installed on both ends of the pipe body of the U-shaped pipe 1, and valve 2 installed on both ends of the pipe body of the U-shaped pipe 2, and the U-shaped pipe 2 is connected to the tail gas treatment box 2 through an exhaust pipe.

[0009] As a further embodiment of this utility model: an air intake pipe is connected to the first U-shaped pipe, the air intake pipe is connected to the exhaust gas input pipe, and the end of the exhaust pipe away from the second U-shaped pipe extends into the interior of the second exhaust gas treatment box and is close to the inner bottom wall of the second exhaust gas treatment box.

[0010] As a further embodiment of this utility model: the two valves are located at the inlet of the two exhaust gas treatment boxes, and the two valves are located at the outlet of the two exhaust gas treatment boxes.

[0011] As a further embodiment of this utility model: four positioning grooves are provided at equal intervals on the inner top wall of the exhaust gas treatment box, and a positioning groove is provided on the top of the lifting plate at a position corresponding to each positioning groove. A sealing gasket is fixed in both the positioning groove and the positioning groove.

[0012] As a further embodiment of this utility model: the filter plate is provided in four pieces, and each filter plate is placed between the corresponding positioning groove one and positioning groove two. The front and rear sides of the four filter plates are fixed with sealing plates. The front and rear sides of the filter plates are tightly attached to the front and rear sides of the inner wall of the exhaust gas treatment box one through the sealing plates. The four filter plates are arranged in sequence from U-shaped tube one to U-shaped tube two as stainless steel filter mesh plate, honeycomb activated carbon plate, metal fiber sintered plate and activated carbon fiber felt plate.

[0013] As a further embodiment of this utility model: the bottom of the exhaust gas treatment box is provided with a rectangular docking groove, a sealing ring is fixed to the inner top wall of the docking groove, and a rectangular docking ring is fixed to the top of the lifting plate. The docking ring is inserted into the docking groove and fits tightly against the sealing ring.

[0014] As a further embodiment of this utility model: a limiting groove is provided on both sides of the inner wall of the through hole, a limiting slider is fixed on both sides of the lifting plate, the limiting slider is slidably connected in the limiting groove, and the four sides of the lifting plate are slidably connected to the four sides of the inner wall of the through hole respectively.

[0015] As a further embodiment of this utility model: the exhaust gas treatment box 2 contains water inside, the top of the exhaust gas treatment box 2 is also connected to an exhaust port and a water supply pipe, the water supply pipe is threaded with a sealing plug, and a drain pipe is provided on the bottom side of the exhaust gas treatment box 2, and a drain valve is provided on the drain pipe.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] I. In this application, through the design of two exhaust gas treatment boxes, U-shaped pipe 1, U-shaped pipe 2, valve 1, and valve 2, the two exhaust gas treatment boxes can be used interchangeably. While one exhaust gas treatment box is filtering the exhaust gas, the filter plate of the other exhaust gas treatment box can be replaced, thereby ensuring continuous filtration of the exhaust gas, avoiding interruption of filtration, and ensuring the treatment efficiency of the exhaust gas. This method can achieve good continuity of exhaust gas treatment without stopping the input of exhaust gas, and has better practicality than the prior art.

[0018] Second, in this application, through the designed lifting cylinder, lifting plate, positioning groove one, and positioning groove two, when it is necessary to replace the filter plates in exhaust gas treatment box one, the operator can remove multiple filter plates separately by lowering the lifting plate. When installing new filter plates, the filter plates can be directly inserted into the corresponding positioning groove two, and the positioning groove two is used to position the filter plates. Then, the lifting plate can be used to lift and install multiple filter plates in exhaust gas treatment box one at once. This method of replacing filter plates is simpler to operate and saves more time and effort for the operator, which is conducive to the rapid replacement of filter materials. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 This is a front view cross-sectional structural diagram of the present invention;

[0021] Figure 3 This is a utility model Figure 2 Enlarged structural diagram at point A in the diagram;

[0022] Figure 4 This is a three-dimensional structural diagram of the lifting plate of this utility model;

[0023] Figure 5 This is a cross-sectional structural diagram of the present invention when replacing the filter plate using a lifting cylinder.

[0024] The reference numerals and names in the figure are as follows:

[0025] 1. Support platform; 2. Exhaust gas treatment box one; 201. Positioning groove one; 202. Docking groove; 203. Sealing ring; 3. Exhaust gas treatment box two; 301. Exhaust port; 302. Water supply pipe; 4. Lifting cylinder; 5. U-shaped pipe one; 6. Inlet pipe; 7. Valve one; 8. U-shaped pipe two; 9. Exhaust pipe; 10. Valve two; 11. Through hole; 1101. Limiting slide groove; 12. Lifting plate; 1201. Docking ring; 1202. Limiting slider; 13. Filter plate; 1301. Sealing sheet; 14. Positioning groove two; 15. Sealing gasket. Detailed Implementation

[0026] 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.

[0027] Please see Figure 1-5 A tail gas treatment device for acetonitrile production includes a support platform 1. Two tail gas treatment boxes 1-2 and one tail gas treatment box 2-3 are respectively installed on the top of the support platform 1. The bottom of each tail gas treatment box 1-2 has an open structure. A through hole 11 communicating with the tail gas treatment box 1-2 is provided at the bottom of the support platform 1 and at the bottom position of each tail gas treatment box 1-2. The through hole 11 communicates with the opening at the bottom of the tail gas treatment box 1-2, facilitating the entry and exit of filter plates 13. Each through hole 11 is equipped with a lifting plate 12 driven by a lifting cylinder 4. The lifting cylinder 4 is installed on the plate at the bottom of the support platform 1. The power output shaft of the lifting cylinder 4 is fixed at the center of the bottom of the lifting plate 12. Multiple filter plates 13 are installed on the top of the lifting plate 12. One side of the two exhaust gas treatment boxes 1 2 is connected by a U-shaped pipe 5, and the other side of the two exhaust gas treatment boxes 1 2 is connected by a U-shaped pipe 2 8. Valves 1 7 are installed on both ends of the pipe body of the U-shaped pipe 1 5, and valves 2 10 are installed on both ends of the pipe body of the U-shaped pipe 2 8. The U-shaped pipe 2 8 is connected to the exhaust gas treatment box 2 3 through the exhaust pipe 9.

[0028] Please see Figure 1 and Figure 2 In this embodiment, an intake pipe 6 is connected to the U-shaped pipe 5, and the intake pipe 6 is connected to the exhaust gas input pipe. The end of the exhaust pipe 9 away from the U-shaped pipe 8 extends into the interior of the exhaust gas treatment box 3 and is close to the inner bottom wall of the exhaust gas treatment box 3.

[0029] Specifically, the intake pipe 6 is connected to the exhaust gas input pipe, which is connected to the exhaust gas generating equipment. The exhaust gas generated by the exhaust gas generating equipment can be directly introduced into the exhaust gas treatment box 2 through the intake pipe 6. The exhaust pipe 9 is placed inside the exhaust gas treatment box 3 and close to the inner bottom wall, which allows the input exhaust gas to better mix with the water inside the exhaust gas treatment box 3.

[0030] Please see Figure 1 In this embodiment, two valves 7 are located at the inlet of the two exhaust gas treatment boxes 2, and two valves 10 are located at the outlet of the two exhaust gas treatment boxes 2.

[0031] Specifically, by opening or closing valve 7 and valve 10 of the corresponding exhaust gas treatment box 2, it can be determined whether exhaust gas enters the exhaust gas treatment box 2. In other words, when exhaust gas enters one of the exhaust gas treatment boxes 2, the filter plate 13 in the other exhaust gas treatment box 2 can be replaced to avoid interruption of exhaust gas filtration.

[0032] Please see Figure 2 and Figure 4 In this embodiment, four positioning grooves 201 are equally spaced on the inner top wall of the exhaust gas treatment box 2. A positioning groove 24 is provided on the top of the lifting plate 12 at a position corresponding to each positioning groove 201. A sealing gasket 15 is fixed in both the positioning groove 201 and the positioning groove 24.

[0033] Specifically, the four positioning grooves 1201 and the four positioning grooves 214 correspond to each other in pairs, which facilitates the positioning and installation of the filter plate 13. Each of them is equipped with a sealing gasket 15, which can be used to squeeze the sealing gasket 15 by the pressure brought by the lifting cylinder 4 when the filter plate 13 is inserted, thereby improving the sealing performance of the top and bottom of the filter plate 13.

[0034] Please see Figure 2 and Figure 4 In this embodiment, four filter plates 13 are provided, and each filter plate 13 is placed between the corresponding positioning groove 1 201 and positioning groove 2 14. Sealing plates 1301 are fixed on the front and rear sides of the four filter plates 13. The front and rear sides of the filter plates 13 are tightly attached to the front and rear sides of the inner wall of the exhaust gas treatment box 2 through the sealing plates 1301. The four filter plates 13 are, in order from the U-shaped tube 1 5 to the U-shaped tube 2 8, a stainless steel filter mesh plate, a honeycomb activated carbon plate, a metal fiber sintered plate and an activated carbon fiber felt plate.

[0035] Specifically, sealing plates 1301 are fixed on both the front and rear sides of the filter plate 13. When the filter plate 13 enters the exhaust gas treatment box 2, the pressure generated by the lifting cylinder 4 causes the sealing plates 1301 on both sides of the filter plate 13 to be squeezed, thereby improving the sealing performance of the front and rear sides of the filter plate 13. The four filter plates 13 are a stainless steel filter mesh plate, a honeycomb activated carbon plate, a metal fiber sintered plate, and an activated carbon fiber felt plate, respectively. The effect is that the stainless steel filter mesh plate can perform initial filtration of large particles in the exhaust gas, and the honeycomb activated carbon plate has a unique honeycomb structure that can provide more... The adsorption sites adsorb impurities in the exhaust gas, increasing the contact area, which not only improves filtration efficiency but also ensures uniform airflow distribution. The metal fiber sintered plate is a fiber sintered plate that forms a pore gradient through the stacking of multiple layers of metal fibers. Its three-dimensional network structure gives it a large dirt-holding capacity, which can trap more particulate pollutants and extend the filter material replacement cycle. The activated carbon fiber felt plate has abundant micropores and a high specific surface area, which makes it better able to adsorb harmful gases, odors, dust and other impurities in the exhaust gas. By using multiple filter plates to filter the exhaust gas, the treatment effect of the exhaust gas can be significantly improved.

[0036] Please see Figure 2 and Figure 3 In this embodiment, the bottom of the exhaust gas treatment box 2 is provided with a rectangular docking groove 202. A sealing ring 203 is fixed on the inner top wall of the docking groove 202. A rectangular docking ring 1201 is fixed on the top of the lifting plate 12. The docking ring 1201 is inserted into the docking groove 202 and tightly fits the sealing ring 203.

[0037] Specifically, the designed docking groove 202 and docking ring 1201 can improve the stability of the connection between the lifting plate 12 and the exhaust gas treatment box 2, and the docking ring 1201 can be inserted into the docking groove 202 and tightly fit the sealing ring 203 to improve the sealing performance of the connection.

[0038] Please see Figure 2 and Figure 3 In this embodiment, limiting grooves 1101 are provided on both sides of the inner wall of the through hole 11, and limiting sliders 1202 are fixed on both sides of the lifting plate 12. The limiting sliders 1202 are slidably connected in the limiting grooves 1101, and the four sides of the lifting plate 12 are slidably connected to the four sides of the inner wall of the through hole 11.

[0039] Specifically, when the lifting plate 12 is in motion, the limiting slider 1202 moves in the limiting groove 1101, which can improve the positional accuracy of the lifting plate 12 and also ensure the stability of the lifting plate 12 in the through hole 11.

[0040] Please see Figure 1 and Figure 2In this embodiment, the exhaust gas treatment box 2 3 contains water, and the top of the exhaust gas treatment box 2 3 is also connected to the exhaust port 301 and the water supply pipe 302. The water supply pipe 302 is threaded with a sealing plug, and a drain pipe is provided on the bottom side of the exhaust gas treatment box 2 3. A drain valve is provided on the drain pipe.

[0041] Specifically, water is placed in the exhaust gas treatment box 2 3 to further treat the filtered exhaust gas, dissolving any unfiltered impurities in the water before it is discharged through the exhaust port 301. The water supply pipe 302 is used to replenish water to the exhaust gas treatment box 2 3, and the drain pipe is used to drain the water from the exhaust gas treatment box 2 3 to ensure the filtration effect.

[0042] In use: First, close valve 7 and valve 10 at the inlet and outlet of one of the exhaust gas treatment boxes 1-2, and open valve 7 and valve 10 at the inlet and outlet of the other exhaust gas treatment box 1-2. The exhaust gas enters the exhaust gas treatment box 1-2 with valve 7 and valve 10 open through the inlet pipe 6. Then, the exhaust gas is filtered by multiple filter plates 13 inside the exhaust gas treatment box 1-2. The filtered exhaust gas enters the exhaust gas treatment box 2-3 through the exhaust pipe 9 and mixes with the water in the exhaust gas treatment box 2-3, further dissolving the unfiltered impurities in the water. Finally, the filtered exhaust gas is discharged through the exhaust port 301.

[0043] When it is necessary to replace or maintain the filter plate 13 inside one of the exhaust gas treatment boxes 1-2, the operator first opens valve 7 and valve 10 at the inlet and outlet of the other exhaust gas treatment box 1-2, and closes valve 7 and valve 10 at the inlet and outlet of the exhaust gas treatment box 1-2 where the filter plate 13 needs to be replaced. This diverts the exhaust gas path, allowing it to enter the other exhaust gas treatment box 1-2 for filtration without interrupting the filtration process. Then, the corresponding lifting cylinder 4 is activated. The power output shaft of the lifting cylinder 4 drives the lifting plate 12 to descend, causing the lifting plate 12 to exit through the through hole 11. The operator can then pull down and remove multiple filter plates 13 one by one through the through hole 11. After removing multiple filter plates 13, the operator can insert the new filter plates 13 one by one into the lifting plate 1. In the positioning groove 14 of 2, the lifting cylinder 4 is activated again to push the lifting plate 12 to rise, which in turn drives the multiple filter plates 13 on the lifting plate 12 into the exhaust gas treatment box 2. The top of the filter plates 13 is then tightly fitted with the sealing gasket 15 inside the positioning groove 201, achieving one-time installation of multiple filter plates 13. This continues until the docking ring 1201 at the top of the lifting plate 12 enters the docking groove 202 and is tightly fitted with the sealing ring 203. The limiting sliders 1202 on both sides of the lifting plate 12 reach the end of the limiting slide groove 1101. This completes the replacement of the filter plates 13 inside the exhaust gas treatment box 2, and the exhaust gas treatment box 2 with the replaced filter plates 13 is ready for use. This makes it convenient to directly use the exhaust gas treatment box 2 with the replaced filter plates 13 when replacing the filter plates 13 in another exhaust gas treatment box 2 next time.

[0044] 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 tail gas treatment device for acetonitrile production, characterized in that, Includes a support platform (1), and the top of the support platform (1) is respectively provided with two exhaust gas treatment boxes one (2) and one exhaust gas treatment box two (3); The bottom of the exhaust gas treatment box (2) is an open structure. The bottom of the support platform (1) and at the position of the bottom of each exhaust gas treatment box (2) are provided with a through hole (11) communicating with the exhaust gas treatment box (2). Each through hole (11) is provided with a lifting plate (12) driven by a lifting cylinder (4). The top of the lifting plate (12) is provided with multiple filter plates (13). One side of the two exhaust gas treatment boxes (2) is connected by a U-shaped pipe (5), and the other side of the two exhaust gas treatment boxes (2) is connected by a U-shaped pipe (8). A valve (7) is installed on the pipe body at both ends of the U-shaped pipe (5), and a valve (10) is installed on the pipe body at both ends of the U-shaped pipe (8). The U-shaped pipe (8) is connected to the exhaust gas treatment box (3) through an exhaust pipe (9).

2. The tail gas treatment device for acetonitrile production according to claim 1, characterized in that, The U-shaped tube (5) is connected to an air intake pipe (6), which is connected to the exhaust gas input pipe. The exhaust pipe (9) extends from the U-shaped tube (8) into the interior of the exhaust gas treatment box (3) and is close to the inner bottom wall of the exhaust gas treatment box (3).

3. The tail gas treatment device for acetonitrile production according to claim 1, characterized in that, The two valves (7) are located at the inlet of the two exhaust gas treatment boxes (2) respectively, and the two valves (10) are located at the outlet of the two exhaust gas treatment boxes (2) respectively.

4. The tail gas treatment device for acetonitrile production according to claim 1, characterized in that, The inner top wall of the exhaust gas treatment box (2) is provided with four positioning slots (201) at equal intervals. The top of the lifting plate (12) and the position corresponding to each positioning slot (201) are provided with positioning slots (14). Sealing gaskets (15) are fixed in both positioning slots (201) and positioning slots (14).

5. The tail gas treatment device for acetonitrile production according to claim 4, characterized in that, The filter plate (13) is provided in four pieces, and each filter plate (13) is placed between the corresponding positioning groove one (201) and positioning groove two (14). The front and rear sides of the four filter plates (13) are fixed with sealing plates (1301). The front and rear sides of the filter plates (13) are tightly attached to the front and rear sides of the inner wall of the exhaust gas treatment box one (2) through the sealing plates (1301). The four filter plates (13) are arranged in the following order from the direction of U-shaped tube one (5) to U-shaped tube two (8): stainless steel filter mesh plate, honeycomb activated carbon plate, metal fiber sintered plate and activated carbon fiber felt plate.

6. The tail gas treatment device for acetonitrile production according to claim 1, characterized in that, The bottom of the exhaust gas treatment box (2) is provided with a rectangular docking groove (202). A sealing ring (203) is fixed on the inner top wall of the docking groove (202). A rectangular docking ring (1201) is fixed on the top of the lifting plate (12). The docking ring (1201) is inserted into the docking groove (202) and tightly fits the sealing ring (203).

7. The tail gas treatment device for acetonitrile production according to claim 1, characterized in that, Limiting grooves (1101) are provided on both sides of the inner wall of the through hole (11), and limiting sliders (1202) are fixed on both sides of the lifting plate (12). The limiting sliders (1202) are slidably connected in the limiting grooves (1101), and the four sides of the lifting plate (12) are slidably connected to the four sides of the inner wall of the through hole (11).

8. The tail gas treatment device for acetonitrile production according to claim 1, characterized in that, The exhaust gas treatment box 2 (3) contains water. The top of the exhaust gas treatment box 2 (3) is connected to an exhaust port (301) and a water supply pipe (302). A sealing plug is threaded onto the water supply pipe (302). A drain pipe is provided on the bottom side of the exhaust gas treatment box 2 (3), and a drain valve is provided on the drain pipe.

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