Process for recovering waste sulfuric acid in nitration process section

Abstract

The invention discloses a nitration process section waste sulfuric acid recovery process, which comprises a filtering tank, a butt joint mechanism, a butt joint ring mechanism and a filtering mechanism, when impurity garbage in the filtering mechanism needs to be treated, the butt joint mechanism is lifted into a filtering tank main body through a hoisting crane, and the butt joint ring mechanism is lifted into the filtering tank main body through the hoisting crane; first butt joint protruding plates on the two sides of a butt joint fixing plate are movably arranged in butt joint through grooves in the inner wall of a filtering tank body in a sleeved mode, after a butt joint mechanism makes contact with a butt joint ring mechanism, a positioning block is arranged in a butt joint groove in a first butt joint block in a sleeved mode, and a second butt joint block is driven by an adjusting air cylinder to be arranged in a positioning groove in a positioning plate in a sleeved mode; the butt-joint mechanism and the butt-joint ring mechanism are connected in a fastened and aligned mode, the butt-joint ring mechanism and the filtering mechanism can be hoisted at the same time through the hoisting crane to clean garbage impurities in the filtering mechanism, and the filtering mechanism can be automatically taken out of the filtering tank body through the butt-joint mechanism and the butt-joint ring mechanism; and the automation degree of the device and the safety in the device maintenance process are improved.

Description

Technical Field

[0001] The invention relates to the technical field of waste sulfuric acid recovery, and in particular to a process for recovering waste sulfuric acid in a nitration process. Background Art

[0002] A typical source of large amounts of waste acid is the nitration process, in which a mixture of sulfuric acid and nitric acid is used, resulting in dilute waste sulfuric acid contaminated with nitric acid, nitrous acid and organic compounds, which can in many cases be denitrated to recover dissolved nitric acid and organic compounds.

[0003] The Chinese patent with the existing authorization announcement number CN218280730U discloses a waste sulfuric acid recovery device, specifically a waste sulfuric acid recovery and utilization device, comprising a filter tank, the top of the filter tank is fixedly connected to two fixed blocks 1, the top of the two fixed blocks 1 is installed with a motor 1, one end of the filter tank is connected with a feed port, the output end of the motor 1 is fixedly connected with a shaft 1, the shaft 1 penetrates the filter tank and is rotatably connected with the filter tank, the inner wall of the filter tank is provided with a rotating groove, the outer wall of the motor 1 is fixedly connected with a fixed shaft, one end of the fixed shaft is fixedly connected with a cleaning plate, the bottom end of the cleaning plate is fixedly connected with a steel brush, the bottom end of the filter tank is connected with a pipe 1, one end of the pipe 1 is connected with a valve 1, the inner wall of the filter tank is fixedly connected with a filter screen, and the bottom end of the filter tank is connected with a pipe 2. The device cleans the filter screen by the cleaning plate and the steel brush to avoid clogging of the filter screen, thereby improving the efficiency of waste sulfuric acid recovery, improving the practicality, and improving the safety of workers.

[0004] The shortcomings of the above-mentioned existing technical solutions are: the filter is cleaned by a steel brush, the steel brush and the filter are in an acidic environment for a long time, and the steel brush and the filter need to be maintained frequently. During the replacement of the steel brush and the filter, the staff are easily exposed to waste acid water, and there is still room for improvement in practicality. Summary of the invention

[0005] The purpose of the present invention is to provide a waste sulfuric acid recovery process in a nitration process section to solve the technical problem that in the prior art, the filter screen is cleaned by a steel brush, the steel brush and the filter screen are in an acidic environment for a long time, and the steel brush and the filter screen need to be maintained frequently. During the replacement of the steel brush and the filter screen, the staff are easily exposed to waste acid water.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0007] A process for recovering waste sulfuric acid in a nitration process section comprises the following steps:

[0008] Step 1: Fixedly connect the connection end of the lifting crane to the adapter end of the docking mechanism, and lift the docking mechanism out of the filter tank body by the lifting crane;

[0009] Step 2: passing the waste sulfuric acid solution to be treated into the filter tank body through the feed port above the filter tank body, and filtering the waste sulfuric acid solution through the filter gap 1 between the fixed rod 1 and the fixed ring 1 and the filter gap 2 between the fixed rod 2 and the fixed ring 2;

[0010] Step 3: When the impurities and garbage in the filter mechanism need to be processed, the docking mechanism is hoisted into the filter tank body by a crane. In the process of hoisting the docking mechanism, the docking convex plates on both sides of the docking fixing plate are movably sleeved into the docking grooves on the inner wall of the filter tank body, so as to facilitate the preliminary positioning between the docking mechanism and the docking ring mechanism;

[0011] Step 4: After the docking mechanism and the docking ring mechanism are in contact, the positioning block is sleeved in the docking groove on the docking block one, and the docking block two is driven by the adjusting cylinder to be sleeved in the positioning groove of the positioning plate. The docking mechanism and the docking ring mechanism are fastened and aligned, and the docking ring mechanism and the filter mechanism can be lifted at the same time by a lifting crane to clean the garbage and impurities in the filter mechanism.

[0012] A device for recovering waste sulfuric acid in a nitration process section, comprising:

[0013] The filter tank comprises a filter tank body, wherein a feed inlet is provided at the upper end of the filter tank body, a feed inlet is provided at the lower end of the docking slot, and docking slots are symmetrically distributed and provided on the inner wall of the filter tank body, and the docking slots extend from the opening of the feed inlet to the middle of the filter tank body;

[0014] The docking mechanism comprises a mechanism mounting plate, both ends of the bottom surface of the mechanism mounting plate are fixedly connected with connection blocks, the lower ends of the connection blocks are fixedly connected with docking blocks 1, a docking groove is provided on the docking block 1, both ends of the mechanism mounting plate are provided with docking blocks 2 and an adjusting cylinder for driving the docking blocks 2 to reciprocate, an adapter seat is fixedly connected to the mechanism mounting plate, a docking fixing plate is fixedly connected to the upper end of the adapter seat, an adapter end for connecting to a lifting crane is fixedly connected to the docking fixing plate, both ends of the docking fixing plate are fixedly connected with docking convex plates 1, and the docking convex plates 1 are movably arranged in the docking through groove;

[0015] The filtering mechanism comprises a horizontally arranged mechanism bottom plate, a fixing rod 1 is evenly distributed in an annular shape and fixedly connected on the side end surface of the mechanism bottom plate, a fixing rod 2 is fixedly connected to the fixing rod 1, a plurality of fixing rings 1 with gradually increasing diameters are coaxially sleeved and fixedly connected on the annularly evenly distributed fixing rod 1, and fixing rings 2 are evenly distributed and fixedly connected along the length direction of the fixing rod 2. The filtering mechanism is arranged in the filtering tank body, and a docking ring mechanism for docking with a docking block 1 and a docking block 2 of the docking mechanism is arranged on the filtering mechanism, and both ends of the docking ring mechanism are movably arranged in the docking groove.

[0016] As a further solution of the present invention: a filtering gap 1 is formed between a fixing rod 1 evenly distributed in an annular shape and a plurality of fixing rings 1 with gradually increasing diameters, and a filtering gap 2 is formed between a fixing rod 2 and a fixing ring 2.

[0017] As a further solution of the present invention: the filtering mechanism is cylindrical as a whole, and the fixing rod 1, the fixing rod 2, the fixing ring 1 and the fixing ring 2 are all made of polypropylene.

[0018] As a further solution of the present invention: a cylinder fixing plate is fixedly connected to the mechanism mounting plate, a cylinder sleeve frame is fixedly connected to the cylinder fixing plate, and the regulating cylinder is fixedly connected to the cylinder sleeve frame.

[0019] As a further solution of the present invention: a cylinder telescopic rod is fixedly connected to the driving end of the regulating cylinder, a connecting plate is fixedly connected to the cylinder telescopic rod, and the second docking block is fixedly connected to the connecting plate.

[0020] As a further solution of the present invention: the docking ring mechanism includes a docking ring body, and two ends of the docking ring body are symmetrically distributed and fixedly connected with docking protrusions 2, positioning blocks and positioning plates. There are two docking protrusions 2, positioning blocks and positioning plates. The positioning blocks correspond to the docking grooves on the docking block 1, and the positioning plate is provided with positioning grooves corresponding to the docking block 2.

[0021] As a further solution of the present invention: the docking ring mechanism is movably sleeved in the docking groove through the second docking convex plate, and the docking ring body is fixedly connected to the second fixed ring.

[0022] Beneficial effects of the present invention:

[0023] 1. When the present invention is in use, when it is necessary to process the impurities and garbage in the filter mechanism, the docking mechanism is hoisted into the filter tank body by a lifting crane. In the process of hoisting the docking mechanism, the docking convex plates on both sides of the docking fixing plate are movably sleeved in the docking grooves on the inner wall of the filter tank body, which facilitates the initial positioning between the docking mechanism and the docking ring mechanism. After the docking mechanism contacts the docking ring mechanism, the positioning block is sleeved in the docking groove on the docking block one, and the docking block two is sleeved in the positioning groove of the positioning plate by adjusting the cylinder. The docking mechanism and the docking ring mechanism are fastened and aligned. The docking ring mechanism and the filter mechanism can be lifted up at the same time by a lifting crane to clean the garbage and impurities in the filter mechanism. The filter mechanism can be automatically taken out from the filter tank body by the docking mechanism and the docking ring mechanism, so as to avoid direct contact between the staff and the filtering equipment, thereby improving the automation degree of the device and the safety during the maintenance of the device.

[0024] 2. In the present invention, a filtering gap 1 is formed between a fixed rod 1 uniformly distributed in an annular shape and a plurality of fixed rings 1 with gradually increasing diameters, and a filtering gap 2 is formed between a fixed rod 2 and a fixed ring 2. When in use, the waste sulfuric acid solution is filtered through the filtering gap 1 between the fixed rod 1 and the fixed ring 1 and the filtering gap 2 between the fixed rod 2 and the fixed ring 2. The filtering mechanism is cylindrical as a whole. The fixed rod 1, the fixed rod 2, the fixed ring 1 and the fixed ring 2 are all made of polypropylene, which can effectively improve the durability of the filtering mechanism in an acidic environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the docking mechanism structure of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the docking ring mechanism of the present invention;

[0030] Figure 5 The three-dimensional structure diagram of the filtering mechanism of the present invention is shown in FIG. Figure 1 ;

[0031] Figure 6 The three-dimensional structure diagram of the filtering mechanism of the present invention is shown in FIG. Figure 2 ;

[0032] Figure 7 The present invention Figure 2 Enlarged structural diagram at A in the middle.

[0033] In the figure: 1. filter tank; 11. filter tank body; 12. feed inlet; 13. docking slot; 14. discharge port; 2. docking mechanism; 21. mechanism mounting plate; 22. connecting block; 23. docking block 1; 24. docking slot; 25. cylinder fixing plate; 26. cylinder sleeve frame; 27. adjusting cylinder; 28. cylinder telescopic rod; 29. ​​connecting plate; 210. docking block 2; 211. adapter seat; 212. docking fixing plate; 213. adapter end; 214. docking convex plate 1; 3. docking ring mechanism; 31. docking ring body; 32. docking convex plate 2; 33. positioning block; 34. positioning plate; 35. positioning slot; 4. filter mechanism; 41. mechanism bottom plate; 42. fixing rod 1; 43. fixing rod 2; 44. fixing ring 1; 45. fixing ring 2. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figure 1-Figure 7 As shown, a waste sulfuric acid recovery device in a nitration process section comprises:

[0036] The filter tank 1 comprises a filter tank body 11, a feed port 12 is provided at the upper end of the filter tank body 11, a docking groove 13 is provided at the lower end of the filter tank body 11, and docking grooves 13 are symmetrically distributed and provided on the inner wall of the filter tank body 11, and the docking grooves 13 extend from the opening of the feed port 12 to the middle of the filter tank body 11;

[0037] The docking mechanism 2 comprises a mechanism mounting plate 21, both ends of the bottom surface of the mechanism mounting plate 21 are fixedly connected with a connecting block 22, the lower end of the connecting block 22 is fixedly connected with a docking block 23, a docking groove 24 is provided on the docking block 23, both ends of the mechanism mounting plate 21 are provided with a docking block 210 and an adjusting cylinder 27 for driving the docking block 210 to reciprocate, an adapter seat 211 is fixedly connected to the mechanism mounting plate 21, a docking fixing plate 212 is fixedly connected to the upper end of the adapter seat 211, an adapter end 213 for connecting to a crane is fixedly connected to the docking fixing plate 212, both ends of the docking fixing plate 212 are fixedly connected with a docking convex plate 214, and the docking convex plate 214 is movably arranged in the docking through groove 13;

[0038] The filtering mechanism 4 comprises a horizontally arranged mechanism bottom plate 41, a side end surface of the mechanism bottom plate 41 is provided with a fixing rod 1 42 evenly distributed in an annular shape and fixedly connected, a fixing rod 2 43 arranged vertically is fixedly connected to the fixing rod 1 42, a plurality of fixing rings 1 44 with gradually increasing diameters are coaxially sleeved and fixedly connected to the annularly evenly distributed fixing rod 1 42, and a fixing ring 2 45 is evenly distributed and fixedly connected along the length direction of the fixing rod 2 43. The filtering mechanism 4 is arranged in the filtering tank body 11, and a docking ring mechanism 3 for docking with the docking block 1 23 and the docking block 2 210 of the docking mechanism 2 is provided on the filtering mechanism 4, and both ends of the docking ring mechanism 3 are movably arranged in the docking groove 13.

[0039] A filtering gap 1 is formed between the annularly evenly distributed fixing rods 42 and a plurality of fixing rings 44 with gradually increasing diameters, and a filtering gap 2 is formed between the fixing rods 43 and the fixing rings 45. The filtering mechanism 4 is cylindrical as a whole, and the fixing rods 42, 43, 44 and 45 are all made of polypropylene.

[0040] A cylinder fixing plate 25 is fixedly connected to the mechanism mounting plate 21, a cylinder sleeve frame 26 is fixedly connected to the cylinder fixing plate 25, an adjusting cylinder 27 is fixedly connected to the cylinder sleeve frame 26, a cylinder telescopic rod 28 is fixedly connected to the driving end of the adjusting cylinder 27, a connecting plate 29 is fixedly connected to the cylinder telescopic rod 28, and a docking block 210 is fixedly connected to the connecting plate 29.

[0041] The docking ring mechanism 3 includes a docking ring body 31, and docking protrusions 32, positioning blocks 33 and positioning plates 34 are symmetrically distributed and fixedly connected at both ends of the docking ring body 31. There are two docking protrusions 32, positioning blocks 33 and positioning plates 34. The positioning block 33 corresponds to the docking groove 24 on the docking block 1 23. The positioning plate 34 is provided with a positioning groove 35 corresponding to the docking block 210. The docking ring mechanism 3 is movably sleeved in the docking groove 13 through the docking protrusion 32, and the docking ring body 31 is fixedly connected to the fixed ring 2 45.

[0042] A process for recovering waste sulfuric acid in a nitration process section comprises the following steps:

[0043] Step 1: Fixedly connect the connection end of the crane to the adapter end 213 of the docking mechanism 2, and lift the docking mechanism 2 out of the filter tank body 11 by the crane;

[0044] Step 2: The waste sulfuric acid solution to be treated is introduced into the filter tank body 11 through the feed port 12 above the filter tank body 11, and the waste sulfuric acid solution is filtered through the filter gap 1 between the fixing rod 1 42 and the fixing ring 1 44 and the filter gap 2 between the fixing rod 2 43 and the fixing ring 2 45;

[0045] Step 3: When the impurities and garbage in the filter mechanism 4 need to be processed, the docking mechanism 2 is hoisted into the filter tank body 11 by a crane. In the process of hoisting the docking mechanism 2, the docking protrusions 214 on both sides of the docking fixing plate 212 are movably sleeved into the docking grooves 13 on the inner wall of the filter tank body 11, so as to facilitate the preliminary positioning between the docking mechanism 2 and the docking ring mechanism 3;

[0046] Step 4: After the docking mechanism 2 and the docking ring mechanism 3 are in contact, the positioning block 33 is sleeved in the docking groove 24 on the docking block 1 23, and the docking block 2 210 is driven by the adjusting cylinder 27 to be sleeved in the positioning groove 35 of the positioning plate 34. The docking mechanism 2 and the docking ring mechanism 3 are fastened and aligned with each other. The docking ring mechanism 3 and the filter mechanism 4 can be lifted at the same time by a lifting crane to clean the garbage and impurities in the filter mechanism 4.

[0047] In order to facilitate the understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution is briefly described in combination with specific application scenarios:

[0048] During use, when it is necessary to process the impurities and garbage in the filter mechanism 4, the docking mechanism 2 is hoisted into the filter tank body 11 by a lifting crane. In the process of hoisting the docking mechanism 2, the docking convex plate 1 214 on both sides of the docking fixing plate 212 is movably sleeved in the docking groove 13 on the inner wall of the filter tank body 11, so as to facilitate the preliminary positioning between the docking mechanism 2 and the docking ring mechanism 3. After the docking mechanism 2 contacts the docking ring mechanism 3, the positioning block 33 is sleeved in the docking groove 24 on the docking block 1 23, and the docking block 210 is driven by the adjusting cylinder 27 to be sleeved in the positioning groove 35 of the positioning plate 34. The docking mechanism 2 and the docking ring mechanism 3 are fastened and aligned. The docking ring mechanism 3 and the filter mechanism 4 can be lifted up at the same time by a lifting crane to clean the garbage and impurities in the filter mechanism 4. The filter mechanism 4 can be automatically taken out from the filter tank body 11 by the docking mechanism 2 and the docking ring mechanism 3, so as to avoid direct contact between the staff and the filtering equipment, thereby improving the automation degree of the device and the safety during the maintenance of the device.

[0049] A filtering gap one is formed between the annularly evenly distributed fixing rods 42 and a plurality of fixing rings 44 with gradually increasing diameters, and a filtering gap two is formed between the fixing rods 43 and the fixing rings 45. When in use, the waste sulfuric acid solution is filtered through the filtering gap one between the fixing rods 42 and the fixing rings 44 and the filtering gap two between the fixing rods 43 and the fixing rings 45. The filtering mechanism 4 is cylindrical as a whole. The fixing rods 42, 43, 44 and 45 are all made of polypropylene, which can effectively improve the durability of the filtering mechanism 4 in an acidic environment.

[0050] Several embodiments of the present invention are described in detail above, but the embodiments of the present invention are not limited thereto and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A process for recovering waste sulfuric acid in a nitration process, characterized in that: include: S1: fixedly connecting the connection end of the crane to the adapter end (213) of the docking mechanism (2), and lifting the docking mechanism (2) out of the filter tank body (11) by the crane; S2: The waste sulfuric acid solution to be treated is introduced into the filter tank body (11) through the feed port (12) above the filter tank body (11), and the waste sulfuric acid solution is filtered through the filter gap 1 between the fixing rod 1 (42) and the fixing ring 1 (44) and the filter gap 2 between the fixing rod 2 (43) and the fixing ring 2 (45); S3: When it is necessary to process the impurities and garbage in the filter mechanism (4), the docking mechanism (2) is hoisted into the filter tank body (11) by a crane. During the process of hoisting the docking mechanism (2), the docking protrusions (214) on both sides of the docking fixing plate (212) are movably sleeved into the docking grooves (13) on the inner wall of the filter tank body (11), thereby facilitating the preliminary positioning of the docking mechanism (2) and the docking ring mechanism (3); S4: After the docking mechanism (2) and the docking ring mechanism (3) are in contact, the positioning block (33) is sleeved in the docking groove (24) on the docking block 1 (23), and the docking block 2 (210) is driven by the adjustment cylinder (27) to be sleeved in the positioning groove (35) of the positioning plate (34), so that the docking mechanism (2) and the docking ring mechanism (3) are fastened and aligned with each other, and the docking ring mechanism (3) and the filter mechanism (4) can be lifted up at the same time by a lifting crane to clean the garbage and impurities in the filter mechanism (4).

2. A nitration process section waste sulfuric acid recovery device, used to implement the nitration process section waste sulfuric acid recovery process according to claim 1, characterized in that: include: The filter tank (1) comprises a filter tank body (11), wherein a feed inlet (12) is provided at the upper end of the filter tank body (11), a docking groove (13) is provided at the lower end of the filter tank body (11), and docking grooves (13) are symmetrically distributed and provided on the inner wall of the filter tank body (11), and the docking grooves (13) extend from the opening of the feed inlet (12) to the middle of the filter tank body (11); The docking mechanism (2) comprises a mechanism mounting plate (21), both ends of the bottom surface of the mechanism mounting plate (21) are fixedly connected with a connecting block (22), the lower end of the connecting block (22) is fixedly connected with a docking block (23), the docking block (23) is provided with a docking groove (24), both ends of the mechanism mounting plate (21) are provided with a docking block (210) and an adjusting cylinder (27) for driving the docking block (210) to reciprocate, an adapter seat (211) is fixedly connected to the mechanism mounting plate (21), the upper end of the adapter seat (211) is fixedly connected with a docking fixing plate (212), the docking fixing plate (212) is fixedly connected with an adapter end (213) for connecting to a crane, both ends of the docking fixing plate (212) are fixedly connected with a docking convex plate (214), and the docking convex plate (214) is movably arranged in the docking groove (13); The filter mechanism (4) comprises a mechanism bottom plate (41) arranged horizontally, a fixing rod (42) evenly distributed in an annular manner and fixedly connected on the side end surface of the mechanism bottom plate (41), a fixing rod (42) arranged vertically and fixedly connected on the fixing rod (42), a plurality of fixing rings (44) with gradually increasing diameters coaxially sleeved and fixedly connected on the annular evenly distributed fixing rod (42), and a fixing ring (45) evenly distributed along the length direction of the fixing rod (43) and fixedly connected, the filter mechanism (4) is arranged in the filter tank body (11), and a docking ring mechanism (3) for docking with a docking block (23) and a docking block (210) of the docking mechanism (2) is arranged on the filter mechanism (4), and two ends of the docking ring mechanism (3) are movably arranged in the docking groove (13).

3. A nitration process section waste sulfuric acid recovery device according to claim 2, characterized in that: A filtering gap 1 is formed between the annularly evenly distributed fixing rods 1 (42) and a plurality of fixing rings 1 (44) with gradually increasing diameters, and a filtering gap 2 is formed between the fixing rods 2 (43) and the fixing rings 2 (45).

4. A process for recovering waste sulfuric acid in a nitration process according to claim 2, characterized in that: The filtering mechanism (4) is cylindrical in shape as a whole, and the fixing rod 1 (42), the fixing rod 2 (43), the fixing ring 1 (44) and the fixing ring 2 (45) are all made of polypropylene.

5. The device for recovering waste sulfuric acid in the nitration process section according to claim 2, characterized in that: A cylinder fixing plate (25) is fixedly connected to the mechanism mounting plate (21), a cylinder sleeve frame (26) is fixedly connected to the cylinder fixing plate (25), and an adjusting cylinder (27) is fixedly connected to the cylinder sleeve frame (26).

6. A process for recovering waste sulfuric acid in a nitration process according to claim 5, characterized in that: A cylinder telescopic rod (28) is fixedly connected to the driving end of the regulating cylinder (27), a connecting plate (29) is fixedly connected to the cylinder telescopic rod (28), and a second docking block (210) is fixedly connected to the connecting plate (29).

7. The device for recovering waste sulfuric acid in the nitration process section according to claim 2, characterized in that: The docking ring mechanism (3) comprises a docking ring body (31), and docking protrusions (32), positioning blocks (33) and positioning plates (34) are symmetrically distributed and fixedly connected at both ends of the docking ring body (31). The docking protrusions (32), positioning blocks (33) and positioning plates (34) are each provided with two, the positioning blocks (33) correspond to the docking grooves (24) on the docking block (23), and the positioning plates (34) are provided with positioning grooves (35) corresponding to the docking block (210).

8. The device for recovering waste sulfuric acid in the nitration process section according to claim 7, characterized in that: The docking ring mechanism (3) is movably sleeved in the docking groove (13) via the second docking convex plate (32), and the docking ring body (31) is fixedly connected to the second fixing ring (45).

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