Petrochemical oil refining multi-stage sewage treatment device and treatment method

Abstract

The invention relates to the technical field of sewage treatment, and particularly discloses a petrochemical oil refining multi-stage sewage treatment device and method, and the petrochemical oil refining multi-stage sewage treatment device comprises a filter tank, a floating oil removal part, a slag stone removal part and a drain valve; the filter tank is provided with a water inlet and a water outlet; the floating oil removing part is located in the filtering tank and arranged on the upper portion of the filtering tank, the floating oil removing part has a blocking state and a passing state, when the floating oil removing part is in the blocking state, the floating oil removing part blocks the upper portion of the filtering tank, and when the floating oil removing part is in the passing state, the floating oil removing part allows oil refining sewage to pass through; the slag stone removing part is arranged at the bottom of the filter tank, is spaced from the bottom end of the filter tank, and is used for removing slag stone in sewage in the filter tank; and the drain valve is connected with the water outlet of the filter tank and is used for discharging the filtered sewage. The device has the effects of reducing the influence of slag stones on a subsequent sewage stage treatment device and reducing the interference of waste oil in sewage on the subsequent sewage stage treatment device.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a petrochemical refinery multi-stage sewage treatment device and a treatment method. Background Art

[0002] Petrochemical refining is a process of evaporating and fractionating hydrocarbons in crude oil at different temperatures by physical or chemical means. In the process of refining, wastewater is generated during water injection, condensation and water washing. The wastewater is mixed during the discharge process to form sewage. The sewage contains impurities such as waste oil, slag particles, water-soluble organic matter, microorganisms and inorganic salts.

[0003] In the existing sewage treatment process, sewage needs to be treated at multiple levels so that it can be discharged only after it meets the discharge standards. Existing sewage treatment methods include adsorption, membrane separation, oxidation separation, emulsification separation and other methods to separate impurities from sewage.

[0004] In the existing sewage treatment process, the larger slag in the sewage needs to be filtered out before the subsequent sewage classification treatment can be carried out, so as to reduce the probability of the slag damaging the subsequent sewage classification treatment equipment. At the same time, the waste oil contained in the sewage will also interfere with the subsequent sewage classification treatment steps. Summary of the invention

[0005] In order to reduce the impact of slag and rock on subsequent sewage staged treatment devices, and reduce the interference of waste oil in sewage on subsequent sewage staged treatment devices, the present application provides a petrochemical refinery multi-stage sewage treatment device and a treatment method.

[0006] The present application provides a petrochemical refinery multi-stage wastewater treatment device and treatment method using the following technical solutions:

[0007] A petrochemical oil refining multi-stage sewage treatment device, comprising:

[0008] A filter tank is provided with a water inlet and a water outlet;

[0009] The floating oil removal part is located in the filter tank and arranged on the upper part of the filter tank. The floating oil removal part has a blocking state and a passable state. When the floating oil removal part is in the blocking state, the floating oil removal part blocks the upper part of the filter tank. When the floating oil removal part is in the passable state, the floating oil removal part allows the refinery wastewater to pass through.

[0010] A debris removal unit is disposed at the bottom of the filter tank and spaced apart from the bottom end of the filter tank, and the debris removal unit is used to remove debris from the sewage in the filter tank;

[0011] A drain valve is connected to the water outlet of the filter tank and is used to discharge the filtered sewage.

[0012] By adopting the above technical scheme, sewage is introduced into the filter tank through the water inlet, and the floating oil removal unit allows sewage to enter the filter tank in a passable state. The floating oil floats on the top of the filter tank due to the buoyancy, and the slag and stone in the sewage settles below the filter tank under the action of gravity. At this time, the floating oil removal unit changes from a passable state to a blocked state, isolating the floating oil floating on the top of the filter tank, and the slag and stone removal unit removes the slag and stone settled at the bottom of the filter tank, and then opens the drain valve to discharge the sewage separated from the slag and floating oil, thereby facilitating the multi-stage treatment of petrochemical refinery sewage by grading the sewage, reducing the impact of the slag and stone on the subsequent sewage grading treatment device, and reducing the interference of the waste oil in the sewage on the subsequent sewage grading treatment device.

[0013] Optionally, the floating oil removal part includes a positioning frame and a deformer, the positioning frame is fixedly connected to the slot wall of the filter slot, an installation cavity is opened inside the positioning frame, the deformer is arranged in the installation cavity, a plurality of sewage through holes are opened in the middle of the positioning frame, a sliding guide groove is opened on the hole wall of the sewage through hole, and the deformer is slidably connected to the sliding guide groove.

[0014] By adopting the above technical solution, the floating oil removal part is positioned by the positioning frame, and when the floating oil removal part is in the passing state, the deformer is in the installation cavity, so that sewage passes through the sewage through hole. When the floating oil removal part is in the blocking state, the deformer is connected to the sliding guide groove from the installation cavity, thereby blocking the sewage through hole, thereby achieving the effect of isolating the floating oil.

[0015] Optionally, the deformer includes a winding motor, a winding roller and a deformable sealing piece, the winding motor and the winding roller are arranged in the installation cavity, the positioning frame is provided with a winding groove connecting the sliding guide groove, the installation cavity and the sewage through hole, the two ends of the deformable sealing piece are in sliding contact with the groove wall of the winding groove, and the two sides of the deformable sealing piece are in sliding contact with the groove wall of the sliding guide groove.

[0016] By adopting the above technical solution, the deformer controls the rotation of the winding roller through the winding motor. The rotation of the winding roller changes the deformable sealing piece from the state of being wound on the winding roller to the state of being released from the winding roller. When the winding roller is released, the deformable sealing piece slides in the sliding guide groove to complete the sealing of the sewage through hole.

[0017] Optionally, a floating oil discharge device is connected to one side wall of the filter tank, and the floating oil discharge device is arranged above the positioning frame. The floating oil discharge device is used to slide against the positioning frame and the deformation sealing plate. A floating oil discharge outlet is opened on the side wall of the filter tank away from the floating oil discharge device, and the floating oil discharge outlet is connected to a discharge control valve.

[0018] By adopting the above technical solution, the floating oil discharge device is slidably connected to the positioning frame. When the sewage enters the filter tank, the discharge control valve is closed. When the floating oil removal part is in a blocked state, the discharge control valve is opened. The floating oil discharge device slidably abuts against the positioning frame and the deformation blocking piece to discharge the floating oil above the floating oil removal part through the discharge control valve.

[0019] Optionally, the floating oil discharge device includes a telescopic push rod, a connecting plate and an oil absorbing sponge, one end of the telescopic push rod is connected to one side of the filter tank, the connecting plate is fixedly connected to the other end of the telescopic push rod, the bottom end gap of the connecting plate is arranged above the positioning frame, the oil absorbing sponge is connected to the side of the connecting plate away from the telescopic push rod, and the oil absorbing sponge is used to slide against the deformation sealing plate.

[0020] By adopting the above technical solution, when the floating oil discharge device is working, the telescopic push rod is extended and retracted to drive the connecting plate to move, thereby driving the oil-absorbing sponge to move. The oil-absorbing sponge abuts against the positioning frame and the deformation sealing piece, thereby pushing the floating oil on the positioning frame and the deformation sealing piece toward the discharge control valve, and discharging the floating oil from the discharge control valve.

[0021] Optionally, the gravel removal part includes a gravel filter frame, a gravel plugging piece and a gravel filter plate, the gravel filter frame is connected to the tank wall of the filter tank, the gravel plugging piece is rotatably connected to the gravel filter frame, the gravel filter plate is connected to the side of the gravel filter frame close to the tank wall of the filter tank, and the water outlet is opened on the side of the tank wall of the filter tank connected to the gravel filter plate.

[0022] By adopting the above technical scheme, the slag removal part is connected to the filter tank through the slag filter frame, and the slag plugging piece is connected to the slag filter frame. After the sewage enters the filter tank, the slag plugging piece rotates on the slag filter frame, so that the slag in the sewage can enter under the filter frame. After the sewage in the filter tank is precipitated by gravity, the slag enters under the filter frame, and the slag plugging piece rotates to isolate the slag filter frame. After that, the water outlet is opened, and the slag filter plate covers the water outlet to isolate the slag under the filter frame, and the sewage without the slag is discharged.

[0023] Optionally, the slag filter frame includes a plurality of frame rods, each of which is connected to a rotating motor, the slag plugging member is fixedly connected to the frame rods, and the spacing between adjacent frame rods is the width of the slag plugging member.

[0024] By adopting the above technical solution, the slag filter frame is connected to the filter tank through the frame rod, and the rotating motor drives the frame rod to rotate, thereby driving the slag sealing member to rotate, and finally the slag under the filter frame is sealed.

[0025] Optionally, the slag stone plugging member includes a plugging plate, and a plurality of filter holes are formed on the plugging plate.

[0026] By adopting the above technical solution, the slag and rock plugging member isolates the slag and rock below the filter frame through the filter holes opened on the plugging plate.

[0027] Optionally, the trough wall of the filter trough is connected to a slag discharge mechanism, which is arranged below the slag filter frame. The slag discharge mechanism includes a telescopic cylinder and a push plate. A slag discharge trough is provided at the end of the filter trough away from the telescopic cylinder, and the slag discharge trough is blocked by a sealing cover plate.

[0028] By adopting the above technical solution, after the sewage in the filter tank is settled and stratified and discharged, the slag discharge mechanism starts to work, the telescopic cylinder is extended and retracted, driving the push plate to move, and the push plate discharges the slag under the filter frame, and the slag is discharged from the slag discharge tank.

[0029] A method for treating multi-stage wastewater from a petrochemical refinery comprises the following steps:

[0030] The drain valve is closed and the floating oil removal part is in a passable state; sewage enters the filter tank from the water inlet until the filter tank is filled with sewage; the sewage is left to stand until the floating oil floats to the upper part of the filter tank and the slag and stone settle to the bottom of the filter tank; the floating oil removal part is transformed into a blocked state, the slag and stone removal part removes the slag and stone, and the drain valve is opened to discharge the sewage after the floating oil and slag and stone are separated.

[0031] By adopting the above technical scheme, floating oil, sewage and slag are separated from each other under the action of gravity. The floating oil removal device isolates and removes the floating oil, and the slag removal unit removes the slag in the filter tank, thereby realizing stratification of sewage and facilitating multi-stage treatment of sewage.

[0032] Compared with the prior art, the present invention has at least one of the following beneficial technical effects:

[0033] 1. The filter tank allows sewage to enter through the water inlet. The floating oil removal unit is in a passable state at this time, and the water discharge valve is in a blocked state, and the sewage fills the filter tank. Due to the effect of gravity, the slag in the sewage settles at the bottom of the filter tank, and the floating oil floats above the filter tank. At this time, the floating oil removal unit changes from a passable state to a blocked state, thereby isolating the floating oil above the filter tank. The slag removal unit removes the slag settled at the bottom of the filter tank, achieving the effect of simultaneously removing the slag and floating oil in the sewage, reducing the impact of the slag on the subsequent sewage grading treatment device, and reducing the interference of the waste oil in the sewage on the subsequent sewage grading treatment device;

[0034] 2. The floating oil removal part is positioned by the positioning frame, and the deformer moves in the installation cavity, thereby changing the passage state of the floating oil removal part. When the deformer is recovered into the installation cavity, the floating oil removal part is in the passage state. When the deformer slides from the sliding guide groove to block the sewage through hole, the floating oil removal part is changed to the blocking state;

[0035] 3. The floating oil discharge device is slidably abutted against the positioning frame. When sewage enters the filter tank, the floating oil discharge device is located at the tank wall of the filter tank, and the discharge control valve is closed. When the floating oil removal part is in a blocked state, the discharge control valve is opened, and the floating oil discharge device moves toward the discharge control valve, driving the floating oil above the positioning frame to move toward the discharge control valve, thereby discharging the floating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0037] Figure 2 It is a schematic diagram of the location of the water outlet in the embodiment of the present application.

[0038] Figure 3 It is a schematic diagram of the structure of the deformer in the embodiment of the present application.

[0039] Figure 4 It is a schematic diagram of the structure of the sliding guide groove in the embodiment of the present application.

[0040] Figure 5 It is a structural schematic diagram of the bottom end of the filter tank in the embodiment of the present application.

[0041] Figure 6 It is a schematic diagram of the structure of the slag and stone filter frame in the embodiment of the present application.

[0042] In the figure: 1. filter tank; 11. water inlet; 12. water outlet; 13. floating oil discharge outlet; 14. slag stone discharge tank; 2. floating oil removal unit; 21. positioning frame; 211. installation cavity; 212. sewage through hole; 213. sliding guide groove; 214. rewinding tank; 22. deformer; 221. rewinding motor; 222. rewinding roller; 223. deformation plugging piece; 3. slag stone removal unit; 31. slag stone filter frame; 311. frame rod; 312. rotating motor; 32. slag stone plugging piece; 321. plugging plate; 3211. filter hole; 33. slag stone filter plate; 4. drain valve; 5. floating oil discharge device; 51. telescopic push rod; 52. connecting plate; 53. oil absorption sponge; 6. discharge control valve; 7. slag stone discharge mechanism; 71. telescopic cylinder; 72. push plate; 8. plugging cover plate. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1-6 This application is described in further detail.

[0044] The embodiment of the present application discloses a petrochemical refinery multi-stage wastewater treatment device and a treatment method.

[0045] Reference Figure 1 and Figure 2 A petrochemical oil refining multi-stage wastewater treatment device includes a filter tank 1, a floating oil removal part 2, a slag removal part 3 and a drain valve 4.

[0046] The filter tank 1 is provided with a water inlet 11 and a water outlet 12, the floating oil removal part 2 is arranged at the upper part of the filter tank 1, and the floating oil removal part 2 has a blocking state and a passable state, the slag removal part 3 is arranged at the bottom of the filter tank 1, and the drain valve 4 is connected to the water outlet 12 of the filter tank 1, and the water outlet 12 is connected to the sewage collection tank (not marked in the drawing).

[0047] The drain valve 4 is closed, and the sewage generated in the petrochemical oil refining process enters the filter tank 1 through the water inlet 11. The floating oil removal unit 2 is in a passable state at this time, and the sewage fills the filter tank 1 and gradually settles and layers under the action of gravity until the floating oil floats on the upper part of the filter tank 1 and the larger slag is settled in the lower part of the filter tank 1. At this time, the floating oil removal unit 2 changes from a passable state to a blocked state, thereby isolating the floating oil on the upper part of the filter tank 1. At the same time, the slag removal unit 3 removes the slag at the bottom of the filter tank 1. The drain valve 4 is opened to separate the sewage into a slag layer, a floating oil layer and a water-soluble sewage layer, which facilitates the multi-stage treatment of petrochemical oil refining sewage, reduces the impact of slag on the subsequent sewage classification treatment device, and reduces the interference of waste oil in the sewage on the subsequent sewage classification treatment device.

[0048] Reference Figure 2 and Figure 3 The floating oil removal part 2 includes a positioning frame 21 and a deformer 22. The positioning frame 21 is fixedly connected to the tank wall of the filter tank 1. An installation cavity 211 is opened in the positioning frame 21. The deformer 22 is arranged in the installation cavity 211. A sewage through hole 212 is opened in the middle of the positioning cavity. A sliding guide groove 213 is opened on the hole wall of the sewage through hole 212.

[0049] The floating oil removal part 2 is positioned with respect to the tank wall of the filter tank 1 by means of the positioning frame 21 , and the deformer 22 is deformed in the installation cavity 211 , so that the floating oil removal part 2 can be changed between the passable state and the blocked state.

[0050] Reference Figure 3 and Figure 4The deformer 22 includes a winding motor 221, a winding roller 222 and a deformation blocking piece 223. The winding motor 221 and the winding roller 222 are both arranged in the installation cavity 211. The positioning frame 21 is provided with a sliding guide groove 213. The sliding guide groove 213 is provided in the sewage through hole 212. The deformation blocking piece 223 is in sliding contact with the sliding guide groove 213, and the two sides of the deformation blocking piece 223 are in sliding contact with the groove wall of the sliding guide groove 213.

[0051] The deformer 22 drives the winding roller 222 to rotate through the winding motor 221, thereby driving the deformed sealing piece 223 to rotate around the winding roller 222. The winding motor 221 causes the deformed sealing piece 223 to slide in the sliding guide groove 213 through forward and reverse rotation, thereby causing the deformed sealing piece 223 to block the sewage through hole 212 to form a blocked state, or the deformed sealing piece 223 is recovered into the installation cavity 211 to form a pass state.

[0052] Reference Figure 1 and Figure 2 A floating oil discharge device 5 is fixedly connected to one side of the filter tank 1, and the floating oil discharge device 5 is slidably abutted against the positioning frame 21 and the deformation sealing piece 223 on the side away from the filter tank 1. A floating oil discharge port 13 is opened on the tank wall of the filter tank 1 on the side away from the floating oil discharge device 5, and a discharge control valve 6 is connected to the floating oil discharge port 13, and the floating oil discharge port 13 is connected to the floating oil collection tank.

[0053] After the floating oil removal part 2 is in the blocking state to isolate the floating oil, the floating oil discharge device 5 works, the discharge control valve 6 is opened, and the floating oil discharge device 5 slides with the positioning frame 21 and the deformation blocking piece 223 to discharge the floating oil from the floating oil discharge port 13.

[0054] Reference Figure 1 and Figure 2 The floating oil discharge device 5 includes a telescopic push rod 51, a connecting plate 52 and an oil absorbing sponge 53. One end of the telescopic push rod 51 is fixedly connected to the tank wall of the filter tank 1, and the other end of the telescopic push rod 51 is fixedly connected to the connecting plate 52. The oil absorbing sponge 53 is fixedly connected to the side of the connecting plate 52 away from the telescopic push rod 51.

[0055] When the floating oil discharge device 5 is working, the telescopic push rod 51 is extended and retracted to drive the connecting plate 52 to move above the positioning frame 21, and the connecting bottom plate drives the oil-absorbing sponge 53 to slide and abut against the positioning frame 21 and the deformation sealing plate, thereby pushing the floating oil above the positioning frame 21 and the deformation sealing plate 223 toward the direction of the floating oil discharge port 13, so that the floating oil is discharged from the floating oil discharge port 13.

[0056] Reference Figure 1 and Figure 5The slag removal part 3 includes a slag filter frame 31, a slag sealing member 32 and a slag filter plate 33. The slag filter frame 31 includes a plurality of parallel arranged frame rods 311, one end of the frame rod 311 is fixedly connected to a rotating motor 312, the filter tank 1 is provided with a plurality of rotating holes, one end of the frame rod 311 away from the rotating motor 312 is rotatably connected to the rotating hole, the slag sealing member 32 is fixedly connected to the side wall of the frame rod 311, the slag sealing member 32 can fill the gap between adjacent frame rods 311, and the slag filter plate 33 covers the water outlet 12 and is fixedly connected to the frame rod 311.

[0057] The slag removal part 3 forms a filter for blocking slag through the slag filter frame 31, the slag plugging member 32 and the slag filter plate 33, so as to isolate the slag in the lower part of the filter tank 1. The frame rod 311 is rotated by the rotary motor 312 to drive the slag plugging member 32 to rotate, so that when sewage is introduced, the slag can enter under the slag filter frame 31, and when draining, the slag plugging member 32 cooperates with the slag filter plate 33 to store the slag in the slag removal part 3.

[0058] Reference Figure 5 and Figure 6 The slag stone plugging member 32 includes a plugging plate 321 , and the plugging plate 321 is provided with a plurality of filtering holes 3211 .

[0059] The slag blocking member 32 isolates the slag in the slag removal part 3 through the filtering holes 3211 opened on the blocking plate 321, so that the sewage can enter the next treatment step through the filtering holes 3211.

[0060] Reference Figure 1 , Figure 5 and Figure 6 A slag discharge mechanism 7 is arranged under the filter frame, one side of the slag discharge mechanism 7 is fixedly connected to one side wall of the filter tank 1, a slag discharge groove 14 is opened on the groove wall of the filter tank 1 away from the slag discharge mechanism 7, and the slag discharge groove 14 is covered with a blocking cover plate 8, and one end of the slag discharge groove 14 away from the blocking cover plate 8 is connected to a slag collecting groove (not marked in the drawings), and the other side of the slag discharge mechanism 7 faces the slag discharge groove 14. When the slag discharge mechanism 7 is not working, the slag discharge groove 14 is blocked by the blocking cover plate 8. When the slag discharge mechanism 7 is working, the blocking cover plate 8 moves and the slag discharge groove 14 is opened.

[0061] When the slag discharge mechanism 7 is not working, the slag discharge mechanism 7 is covered in the slag discharge slot 14 by the blocking cover plate 8. When the slag discharge mechanism 7 is working, the slag discharge mechanism 7 moves in the direction of the slag discharge slot 14 to discharge the slag from the slag discharge slot 14.

[0062] Reference Figure 1 and Figure 5The slag discharge mechanism 7 includes a telescopic cylinder 71 and a push plate 72. One end of the telescopic cylinder 71 is fixedly connected to one side of the filter tank 1, and the other end of the telescopic cylinder 71 is arranged toward the slag discharge tank 14 and fixedly connected to the push plate 72. The bottom end of the push plate 72 is slidably abutted against the bottom of the filter tank 1, and the top end of the push plate 72 is slidably abutted against the bottom end of the frame rod 311.

[0063] The telescopic cylinder 71 drives the push plate 72 to move toward the debris discharge trough 14 , and the push plate 72 abuts against the bottom of the filter tank 1 and the rack rod 311 , thereby removing the debris between the rack rod 311 and the bottom of the filter tank 1 .

[0064] The implementation principle of a petrochemical refinery multi-stage wastewater treatment device in an embodiment of the present application is as follows: the drain valve 4 in the filter tank 1 is closed, and the wastewater from the petrochemical refinery enters through the water inlet 11. The floating oil removal part 2 allows the wastewater to enter the filter tank 1 in a passable state. Under the action of gravity, the floating oil in the wastewater floats up and the slag particles sink, forming a floating oil layer suspended on the upper part of the filter tank 1, a slag layer at the lower part of the filter tank 1, and a wastewater layer in the middle part of the filter tank 1. At this time, the floating oil removal part 2 is transformed into a blocking state to isolate the floating oil layer, the slag removal part 3 processes the slag in the slag layer, the drain valve 4 is opened, and the middle wastewater layer is discharged from the water outlet 12 to enter the next processing step, thereby realizing wastewater classification, facilitating multi-stage treatment of petrochemical refinery wastewater, reducing the impact of slag on subsequent wastewater classification treatment devices, and reducing the interference of waste oil in the wastewater on subsequent wastewater classification treatment devices.

[0065] A method for treating multi-stage wastewater from a petrochemical refinery, comprising the following steps:

[0066] The drain valve 4 is closed, and the floating oil removal part 2 is in a passable state; sewage enters the filter tank 1 from the water inlet 11 until the filter tank 1 is filled with sewage; the sewage is left to stand until the floating oil floats to the upper part of the filter tank 1 and the slag and stone settle to the bottom of the filter tank 1; the floating oil removal part 2 is transformed into a blocked state, the slag and stone removal part 3 removes the slag and stone, and the drain valve 4 is opened to discharge the sewage after the floating oil and slag and stone are separated.

[0067] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A petrochemical refinery multi-stage wastewater treatment device, characterized in that: include: A filter tank (1) is provided with a water inlet (11) and a water outlet (12); The floating oil removal section (2) is located in the filter tank (1) and arranged on the upper part of the filter tank (1). The floating oil removal section (2) has a blocking state and a passable state. When the floating oil removal section (2) is in the blocking state, the floating oil removal section (2) blocks the upper part of the filter tank (1). When the floating oil removal section (2) is in the passable state, the floating oil removal section (2) allows the refinery wastewater to pass through. A debris removal part (3) is arranged at the bottom of the filter tank (1) and is arranged at a distance from the bottom end of the filter tank (1), and the debris removal part (3) is used to remove debris in the sewage in the filter tank (1); A drain valve (4) is connected to the water outlet (12) of the filter tank (1) and is used to discharge the filtered sewage.

2. A petrochemical refinery multi-stage wastewater treatment device according to claim 1, characterized in that: The floating oil removal part (2) comprises a positioning frame (21) and a deformer (22); the positioning frame (21) is fixedly connected to the tank wall of the filter tank (1); a mounting cavity (211) is provided inside the positioning frame (21); the deformer (22) is arranged in the mounting cavity (211); a plurality of sewage through holes (212) are provided in the middle of the positioning frame (21); a sliding guide groove (213) is provided on the hole wall of the sewage through hole (212); and the deformer (22) is slidably connected to the sliding guide groove (213).

3. A petrochemical refinery multi-stage wastewater treatment device according to claim 2, characterized in that: The deformer (22) comprises a reeling motor (221), a reeling roller (222) and a deformable sealing piece (223); the reeling motor (221) and the reeling roller (222) are both arranged in the mounting cavity (211); the positioning frame (21) is provided with a reeling groove (214) which is connected with the sliding guide groove (213), the mounting cavity (211) and the sewage through hole (212); the two ends of the deformable sealing piece (223) are in sliding contact with the groove wall of the reeling groove (214); and the two sides of the deformable sealing piece (223) are in sliding contact with the groove wall of the sliding guide groove (213).

4. A petrochemical refinery multi-stage wastewater treatment device according to claim 3, characterized in that: A floating oil discharge device (5) is connected to a groove wall on one side of the filter groove (1); the floating oil discharge device (5) is arranged above the positioning frame (21); the floating oil discharge device (5) is used to slide against the positioning frame (21) and the deformable sealing piece (223); a floating oil discharge outlet (13) is provided on the groove wall of the filter groove (1) on a side away from the floating oil discharge device (5); and the floating oil discharge outlet (13) is connected to a discharge control valve (6).

5. A petrochemical refinery multi-stage wastewater treatment device according to claim 4, characterized in that: The floating oil discharge device (5) comprises a telescopic push rod (51), a connecting plate (52) and an oil absorbing sponge (53), wherein one end of the telescopic push rod (51) is connected to one side of the filter tank (1), the connecting plate (52) is fixedly connected to the other end of the telescopic push rod (51), the bottom end gap of the connecting plate (52) is arranged above the positioning frame (21), the oil absorbing sponge (53) is connected to the side of the connecting plate (52) away from the telescopic push rod (51), and the oil absorbing sponge (53) is used to slide against the deformation blocking plate (223).

6. A petrochemical refinery multi-stage wastewater treatment device according to claim 1, characterized in that: The slag removal section (3) comprises a slag filter frame (31), a slag plugging member (32) and a slag filter plate (33); the slag filter frame (31) is connected to the tank wall of the filter tank (1); the slag plugging member (32) is rotatably connected to the slag filter frame (31); the slag filter plate (33) is connected to a side of the slag filter frame (31) close to the tank wall of the filter tank (1); and the water outlet (12) is provided on a side of the tank wall of the filter tank (1) connected to the slag filter plate (33).

7. A petrochemical refinery multi-stage wastewater treatment device according to claim 6, characterized in that: The slag filter frame (31) comprises a plurality of frame rods (311), each of the frame rods (311) is connected to a rotating motor (312), the slag plugging member (32) is fixedly connected to the frame rods (311), and the spacing between adjacent frame rods (311) is the width of the slag plugging member (32).

8. A petrochemical refinery multi-stage wastewater treatment device according to claim 6, characterized in that: The slag stone plugging member (32) comprises a plugging plate (321), and a plurality of filtering holes (3211) are formed on the plugging plate (321).

9. A petrochemical refinery multi-stage wastewater treatment device according to claim 6, characterized in that: A slag discharge mechanism (7) is connected to the trough wall of the filter trough (1), the slag discharge mechanism (7) is arranged below the slag filter frame (31), the slag discharge mechanism (7) comprises a telescopic cylinder (71) and a push plate (72), and a slag discharge trough (14) is provided at the end of the filter trough (1) away from the telescopic cylinder (71), and the slag discharge trough (14) is blocked by a blocking cover plate (8).

10. A method for treating multi-stage wastewater from a petrochemical refinery, applied to the multi-stage wastewater treatment device for a petrochemical refinery according to any one of claims 1 to 9, comprising the following steps: The drain valve (4) is closed and the floating oil removal section (2) is in a passable state; sewage enters the filter tank (1) from the water inlet (11) until the filter tank (1) is filled with sewage; the sewage is left to stand until the floating oil floats to the top of the filter tank (1) and the slag and stone settle to the bottom of the filter tank (1); the floating oil removal section (2) is transformed into a blocked state, the slag and stone removal section (3) removes the slag and stone, and the drain valve (4) is opened to discharge the sewage from which the floating oil and slag and stone have been separated.

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