Acidic water treatment system in crude benzene hydrogenation process and treatment method thereof

Abstract

The invention discloses an acidic water treatment system in a crude benzene hydrogenation process and a treatment method thereof, and belongs to the technical field of wastewater treatment. Aiming at the problem that the existing equipment is low in wastewater treatment efficiency, the invention provides the following technical scheme that the wastewater treatment equipment comprises a steam stripping treatment unit, a pretreatment unit and a biochemical treatment unit, the pretreatment unit consists of a wastewater treatment component and a feeding mechanism, and the feeding mechanism is arranged at the top of the wastewater treatment component. The double-tank treatment pool is arranged to realize switching treatment of wastewater, so that the wastewater treatment time is shortened, the wastewater stirring structure is additionally arranged, and a part of hot steam introduced into the steam stripping treatment unit is introduced into the wastewater stirring structure, so that to-be-stirred wastewater is stirred, and the wastewater treatment efficiency is improved. The acidity of the waste water can be further reduced due to introduction of hot steam, the cleaning mechanism is arranged in the double-groove treatment pond, sediment in the discharged treatment space can be automatically cleaned, and the follow-up waste water treatment effect is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to an acidic water treatment system in a crude benzene hydrogenation process and a treatment method thereof. Background Art

[0002] The production process of crude benzene hydrogenation will produce wastewater and waste gas containing benzene, sulfur, nitrogen and other substances. If these wastewater and waste gas containing benzene, sulfur, nitrogen and other substances are not properly treated and discharged into the environment, they will cause serious organic pollution of water bodies.

[0003] At present, the treatment of acidic water generated in the crude benzene hydrogenation production process is generally combined with a stripping method and a biochemical treatment. The acidic water is first passed into a stripping tower for stripping treatment, and then the wastewater after stripping treatment is input into a biochemical treatment unit for biochemical treatment, thereby achieving purification of the acidic water. However, since some common impurities and pollutants may still exist in the wastewater after stripping treatment, such as sulfides, phenolic compounds, etc., it is necessary to pre-treat the wastewater after stripping treatment again. For example, a Chinese patent with an authorization announcement number of CN213202423U discloses a pretreatment device for purifying water after acidic water stripping, including a stripping tower and a treatment tank. The stripping tower includes a column, an upper hemisphere and a lower hemisphere, and a cold material inlet is opened at the top center of the upper hemisphere.

[0004] The technical solution in the above patent document sets a treatment tank at the wastewater discharge end of the stripping tower to re-treat the wastewater after the stripping treatment. When treating the wastewater, the treatment tank adds chemical reagents by chemical precipitation method to precipitate the debris in the wastewater. However, the existing treatment tank is designed with a single tank, and the wastewater retreatment requires not only stirring but also a certain standing time. Therefore, the single-tank design of the treatment tank will affect the efficiency of wastewater treatment, and the precipitate cannot be discharged conveniently by itself. During long-term use, the dissolution of the precipitate in the wastewater will affect the effect of subsequent wastewater treatment and increase the treatment burden of the subsequent biochemical treatment unit. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides an acidic water treatment system and a treatment method thereof in a crude benzene hydrogenation process, wherein a double-trough treatment tank is provided to realize switching treatment of wastewater, thereby shortening the time of wastewater treatment, and an additional wastewater stirring structure is provided, and a portion of the hot steam introduced into the stripping treatment unit is introduced into the wastewater stirring structure, thereby stirring the wastewater to be stirred and accelerating the mixing efficiency of the chemical reagent and the wastewater, and the introduction of hot steam will further reduce the acidity of the wastewater and reduce the burden of subsequent biochemical treatment. A cleaning mechanism is provided in the double-trough treatment tank, which can self-clean the sediment in the treatment space after discharge, reduce the burden of manual treatment, and ensure the effect of subsequent wastewater treatment, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The technical solution of the first aspect: an acidic water treatment system in a crude benzene hydrogenation process, comprising a stripping treatment unit, a pretreatment unit and a biochemical treatment unit, wherein the pretreatment unit is composed of a wastewater treatment component and a feeding mechanism, wherein the feeding mechanism is arranged on the top of the wastewater treatment component;

[0008] The wastewater treatment component includes a double-trough treatment tank for loading wastewater, the interior of the double-trough treatment tank is provided with a wastewater stirring structure for stirring wastewater, a control cabinet body for controlling the operation of the equipment and a cleaning mechanism for cleaning the inner cavity, a switching mechanism for switching the feeding of wastewater is installed on the side wall of the double-trough treatment tank, and a waste box for loading sediment is provided below the switching mechanism;

[0009] The double tank treatment pool is composed of a treatment pool body and a partition, wherein the partition includes two, both of which are arranged inside the treatment pool body, and the inner cavity of the treatment pool body is divided into three spaces by the two partitions, wherein the spaces on both sides serve as treatment spaces for treating wastewater, and the middle space serves as a working space for placing structures, wherein the control cabinet body is arranged in the working space;

[0010] The wastewater stirring structure is composed of a steam driving mechanism and a mixing mechanism, wherein the mixing mechanism includes two, which are respectively arranged in the corresponding processing space, and the mixing mechanism and the steam driving mechanism are movably connected.

[0011] As a further scheme of the present invention, a wastewater pipe is installed at the discharge end of the stripping treatment unit, the other end of the wastewater pipe is arranged on the switching mechanism in the pretreatment unit, and a control valve is installed on the wastewater pipe. The pretreatment unit and the biochemical treatment unit are connected through a water outlet pipe to facilitate the treated wastewater to enter the secondary process. A hot steam pipe for hot steam transportation is provided on the stripping treatment unit, and a diverter pipe for diverting hot steam is installed on the hot steam pipe through a three-way joint, and the other end of the diverter pipe is arranged on the wastewater stirring structure in the pretreatment unit.

[0012] As a further solution of the present invention, the feeding mechanism includes a box cover arranged on the top of the double-trough treatment tank, the box cover and the treatment tank body are fixed by bolts, and a plurality of holes are opened on the top shell wall of the box cover, and the holes correspond to the treatment space;

[0013] A hopper for temporarily storing chemical reagents is provided above the hole, a material guide pipe is installed at the discharge end of the hopper, the bottom end of the material guide pipe passes through the hole, and a solenoid valve is installed on the material guide pipe. The bottom of the outer ring of each hopper is provided with a plurality of support rods along the circumferential direction, and the bottom end of the support rod is installed on the top outer wall of the box cover by screws.

[0014] As a further solution of the present invention, a discharge port for discharging sediment is provided on the left shell wall of each of the treatment spaces, a discharge port for discharging treated wastewater is provided on the right shell wall of each of the treatment spaces, one end of the outlet pipe is arranged in the discharge port, and the other end of the outlet pipe is installed on the biochemical treatment unit;

[0015] The cleaning mechanism includes two, each corresponding to the corresponding processing space, and the cleaning mechanism is composed of a blocking component and a cleaning component, wherein the blocking component includes a blocking plate for blocking the discharge port, and a curved rod is symmetrically arranged on the outer wall of the blocking plate, and the other ends of the two curved rods penetrate the corresponding side walls of the processing tank body and are connected to an integration plate together, and a reset spring located on the curved rod is sleeved between the integration plate and the left shell wall of the processing tank body;

[0016] The cleaning assembly includes a motor installed on the right outer wall of the treatment pool body by screws, a reciprocating screw is installed on the output end of the motor, the left end of the reciprocating screw penetrates the right shell wall of the treatment pool body, and is rotatably connected to the left inner wall of the treatment pool body through a bearing, a guide groove is provided on each of the partitions, a guide member is slidably connected in the guide groove, a movable seat is threadedly connected on the reciprocating screw, and the side wall of the movable seat is installed on the corresponding guide member by screws, a scraper for scraping the bottom inner wall is slidably connected inside each treatment space, a splicing plate is installed on the top of the scraper, and the end of the splicing plate away from the scraper is installed on the corresponding guide member by bolts, and the splicing plate blocks the corresponding discharge port.

[0017] As a further solution of the present invention, the steam drive mechanism includes a shell housing arranged in the working space, the shell housing is connected to the shunt pipe, and the inside of the shell housing is rotatably connected to an impeller through a pin shaft, the top end of the pin shaft penetrates the top shell wall of the shell housing, and a cam is installed, and an adjusting rod is slidably connected to the peripheral wall of the cam;

[0018] A slide rail is installed on the top outer wall of the shell cover, and a slide sleeve is slidably connected to the slide rail. A carrier plate is installed on the top of the slide sleeve, and the carrier plate and the adjusting rod are also fixedly connected. A movable bar is slidably connected to the carrier plate, and extension rods are installed at both ends of the movable bar. A conical plug is provided at the end of the extension rod away from the movable bar.

[0019] As a further solution of the present invention, an air guide for hot steam transportation is provided on the right side of the shell cover, and the air guide is composed of an air guide pipe and a sleeve, wherein the air guide pipe includes two, which are respectively arranged on the front and rear side shell walls of the sleeve, and the air guide pipe and the inner cavity of the sleeve are connected to each other;

[0020] The shell cover and the sleeve are connected by a bent pipe, and an arc-shaped sealing plate is rotatably connected inside the sleeve. A rotating shaft is installed on the top of the arc-shaped sealing plate. The top of the rotating shaft passes through the top shell wall of the sleeve and is installed with a gear. A rack meshing with the gear is provided on the left side of the gear. The side wall of the rack is provided on a carrier, and a spring telescopic rod is fixedly connected to the carrier, and the output end of the spring telescopic rod is fixedly connected to the movable bar.

[0021] As a further solution of the present invention, the mixing mechanism includes a hollow tube, support tubes are installed on the front and rear side walls of the hollow tube, the support tubes and the inner cavity of the hollow tube are connected to each other, and each support tube is provided with an end sleeve at one end away from the hollow tube, and the end sleeve is installed on the top wall of the processing space by screws;

[0022] The hollow tube is movably connected to a main tube inside, and a plurality of auxiliary tube racks for stirring wastewater are linearly distributed on the bottom shell wall of the main tube in a transverse direction, the auxiliary tube racks and the inner cavity of the main tube are mutually conductive, and the main tube and the inner cavity of the hollow tube are also mutually conductive, and a convex block is arranged on the top of the outer ring of the main tube, and a straight plate is installed on the top of the convex block;

[0023] The straight plate is provided with a through groove, the truncated cone plug is in movable contact with the through groove, and one end of the air guide tube away from the sleeve is respectively installed on the corresponding support tube.

[0024] As a further solution of the present invention, the switching mechanism includes a shell installed on the left outer wall of the double-trough treatment tank by screws, the shell is connected to the wastewater pipe, and a rectangular through groove and a circular hole are opened on the right shell wall of the shell, wherein the circular holes include two, which are respectively located at the front and rear sides of the rectangular through groove, and a delivery pipe is installed in each circular hole, and the end of the water delivery pipe away from the circular hole extends into the corresponding treatment space;

[0025] A slide plate is slidably connected inside the shell, and an ear plate is integrally arranged on the right shell wall of the slide plate. A rectangular through groove extends from the ear plate away from the slide plate, and the left end of the carrier is fixedly connected to the ear plate by bolts.

[0026] As a further solution of the present invention, a page plate is symmetrically arranged on the left inner wall of the shell, and the page plate cooperates with the end of the slide plate to achieve the blocking of the inner cavity space of the shell. An electric push rod is installed on the right outer wall of the shell, and the output end of the electric push rod is installed on the ear plate.

[0027] The technical solution of the second aspect: a method for treating an acidic water treatment system in a crude benzene hydrogenation process, the method comprising the following steps: step 1, setting a pretreatment unit: setting a pretreatment unit between a stripping treatment unit and a biochemical treatment unit, so as to pretreat the wastewater after the stripping treatment again, reduce the impurity content of the wastewater when it enters the biochemical treatment unit, connect the wastewater pipeline at the discharge end of the stripping treatment unit to the switching mechanism, connect the outlet pipe on the double tank treatment tank to the biochemical treatment unit, and the hot steam input into the stripping treatment unit is diverted from the hot steam pipeline to the wastewater stirring structure through a combination of a three-way joint and a diverter pipe;

[0028] Step 2: Setting of the preset program: The control cabinet body is programmed through the control panel arranged on the outer wall of the side of the double-tank treatment tank, and the operation of the control valve on the wastewater pipe, the solenoid valve on the guide pipe in the feeding mechanism, the electric push rod in the switching mechanism and the motor in the cleaning component are controlled;

[0029] Step 3: Use the pretreatment unit to treat the wastewater:

[0030] The first step is the stripping treatment of acidic water: the acidic water is transported to the stripping treatment unit through the acidic water pipeline, and the acidic water meets the hot steam entering the stripping treatment unit through the self-heating steam pipeline, thereby realizing the stripping treatment of the acidic water, and the wastewater after the stripping treatment enters the wastewater pipeline;

[0031] The second step is wastewater pretreatment: the program in the control cabinet body first starts the electric push rod in the switching mechanism, so that the slide moves forward, and then the front page plate is separated from the front end of the slide, and the rear page plate is in contact with the rear end of the slide, so that the front delivery pipe is in a conducting state, and the rear delivery pipe is in a closed state, and then the control valve and the solenoid valve at the corresponding position are opened, so that the wastewater in the wastewater pipe enters the corresponding treatment space in the double-slot treatment pool, and the current solenoid valve is opened, so that the chemical reagent in the hopper is put into the treatment space, and the control valve and the corresponding solenoid valve are automatically closed after being opened for a period of time, thereby ensuring the quantitative delivery of chemical reagents and wastewater;

[0032] The third step is to mix the wastewater in the treatment space: when the electric push rod is running, it synchronously drives the displacement of the carrier in the steam drive mechanism, and the movement of the carrier causes the rack and the movable bar to move, and the movable bar drives the extension rod to move, and then the truncated cone plug on the extension rod extends into the through groove of the straight plate in the corresponding mixing mechanism, and the rack and the gear are meshed and transmitted, thereby driving the arc-shaped blocking plate to rotate to achieve blocking switching. At this time, the hot steam entering the shell cover from the diverter pipe enters the air guide from the bent pipe after the impeller rotates, and then enters the support pipe in the corresponding mixing mechanism through the air guide. As a result, the hot steam enters the corresponding treatment space through the main pipe and the auxiliary pipe rack, and heats the wastewater in the treatment space. When the impeller rotates, the cam is synchronously driven to move, and the carrier plate is reciprocated through the adjusting rod, thereby driving the main pipe in the mixing mechanism contacting the truncated cone plug to reciprocate, thereby improving the uniformity of mixing of wastewater and chemical reagents in the treatment space;

[0033] The fourth step is wastewater switching and static sedimentation: after the wastewater in the front treatment space is mixed, the control program in the control cabinet body starts the electric push rod again, so that the page plate moves backward, thereby blocking the front conveying pipe, opening the rear conveying pipe, and opening the control valve and the corresponding solenoid valve again. The wastewater in the wastewater pipe enters the rear treatment space, and the operation of the electric push rod causes the carrier in the steam drive mechanism to move synchronously, thereby causing the rack and the movable bar to move in the opposite direction, and the frustum plug on the front extension rod is separated from the corresponding mixing mechanism, and the frustum plug on the rear extension rod is extended into the through groove of the straight plate in the corresponding mixing mechanism, and the operation of the rack causes the gear to move in the opposite direction, thereby realizing the switching adjustment of the blockage by synchronous reverse rotation of the arc-shaped blocking plate. At this time, the wastewater in the rear treatment space is in the same mixing treatment as the wastewater in the front treatment space, and the wastewater in the front treatment space is in a static state, which is convenient for the sedimentation of the sediment in the wastewater there;

[0034] The fifth step is the discharge of treated wastewater and the cleaning of the treatment space: when the wastewater in the rear treatment space is mixed and before the wastewater is switched for treatment again, the control program in the control cabinet body turns on the cleaning mechanism in the treatment space that has been stationary, starts the motor, rotates the reciprocating screw, and then displaces the corresponding guide member. The movement of the guide member simultaneously drives the splicing plate and the scraper to move. With the displacement of the splicing plate, the discharge port on the treatment space lacks blocking, and the stationary wastewater enters the biochemical treatment unit through the outlet pipe. During the movement, the scraper scrapes the bottom inner wall of the treatment space to scrape off the settled sediment. As the scraper contacts the integration plate in the plugging assembly, the continuous displacement of the scraper pushes it, causing the bent rod to move, compressing the reset spring, opening the plugging plate, and the sediment is discharged from the unloading port into the waste box below, and the reverse movement of the guide resets the splicing plate and the scraper.

[0035] Step 6, continuous treatment of wastewater: The control program in the control cabinet body runs as described above, repeatedly, so as to achieve continuous treatment of wastewater in the pretreatment unit and ensure the continuity of wastewater entering the biochemical treatment unit.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. By setting up a double-tank treatment pool and cooperating with a switching mechanism to realize the switching treatment of wastewater, the time of wastewater treatment is shortened and the treatment efficiency of wastewater is improved. A wastewater stirring structure is added to the double-tank treatment pool, and then part of the hot steam introduced into the stripping treatment unit is introduced into the wastewater stirring structure through a pipeline to stir the wastewater to be stirred and accelerate the mixing efficiency of chemical reagents and wastewater. The introduction of hot steam will heat the wastewater, thereby further reducing the acidity of the wastewater and reducing the burden of subsequent biochemical treatment.

[0038] 2. During the adjustment process, the switching mechanism not only introduces the wastewater into different treatment spaces in the double-tank treatment tank, but also simultaneously adjusts the steam drive mechanism, so that the hot steam introduced into the wastewater stirring structure enters the corresponding treatment space to heat the corresponding wastewater, and the steam drive mechanism drives the corresponding mixing mechanism to move, so as to stir and mix the wastewater in the treatment space.

[0039] 3. By installing a cleaning mechanism on the double-tank treatment tank, the sediment in the treatment space after the wastewater discharge can be cleaned automatically, thereby reducing the burden of manual treatment and ensuring the effect of subsequent wastewater treatment.

[0040] 4. The plugging component in the cleaning mechanism blocks the discharge port of the treatment space in the double-slot treatment pool, and the motor in the cleaning component drives the reciprocating screw to move, so that the splicing plate drives the scraper to move linearly inside the treatment space, thereby not only realizing the opening of the discharge port to facilitate the discharge of treated wastewater, but also opening it when the splicing plate pushes against the plugging component, thereby allowing the sediment in the treatment space to be discharged from the treatment space along with the residual wastewater, ensuring the internal cleanliness of the treatment space when treating wastewater again, avoiding the residual sediment from dissolving in the new wastewater and affecting the acid concentration of the wastewater, and reducing the operating burden of the subsequent biochemical treatment unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The present invention is a schematic diagram of a system for treating acidic water in a crude benzene hydrogenation process;

[0042] Figure 2 for Figure 1 The structure of the preprocessing unit Figure 1 ;

[0043] Figure 3 for Figure 1 The structure of the preprocessing unit Figure 2 ;

[0044] Figure 4 for Figure 2 Schematic diagram of the wastewater treatment component structure;

[0045] Figure 5 for Figure 3 Schematic diagram of the wastewater treatment component structure;

[0046] Figure 6 for Figure 4 A partial cross-sectional structural diagram of a steam drive mechanism;

[0047] Figure 7 for Figure 6 Axonometric structural diagram of ;

[0048] Figure 8 for Figure 6 Schematic diagram of the structure viewed from above;

[0049] Fig. 9 for Figure 8 A schematic diagram of the enlarged local structure at A;

[0050] Fig.10 for Figure 4 A schematic diagram of a partial cross-sectional structure of a mixing mechanism;

[0051] Fig.11 for Fig.10 Schematic diagram of the structure viewed from above;

[0052] Fig.12 for Figure 4 Schematic diagram of the cleaning mechanism structure;

[0053] Fig.13 for Fig.12 A schematic diagram of the enlarged local structure at B;

[0054] Fig.14 for Figure 4 Schematic diagram of the partial cross-sectional structure of the switching mechanism.

[0055] In the figure: 1. Double-slot treatment tank; 11. Treatment tank body; 12. Partition; 2. Feeding mechanism; 21. Box cover; 22. Hopper; 23. Solenoid valve; 3. Blocking assembly; 31. Blocking plate; 32. Bending rod; 33. Integration plate; 4. Cleaning assembly; 41. Motor; 42. Reciprocating screw rod; 43. Splicing plate; 44. Scraper; 5. Wastewater stirring structure; 51. Steam drive mechanism; 511. Shell cover; 512. Impeller; 513. Cam; 514. Adjustment rod; 515. Slide rail; 516. Sliding sleeve; 517. Carrier plate; 518. Movable bar; 519, extension rod; 5110, carrier; 5111, spring telescopic rod; 5112, rack; 5113, air guide; 51131, air guide pipe; 51132, sleeve; 5114, arc blocking plate; 5115, gear; 52, mixing mechanism; 521, hollow tube; 522, support tube; 523, end sleeve; 524, main tube; 525, straight plate; 526, auxiliary tube rack; 6, switching mechanism; 61, shell; 62, page plate; 63, slide plate; 64, electric push rod; 7, waste box; 8, control cabinet body. DETAILED DESCRIPTION

[0056] See also Figure 1-Figure 4 In an embodiment of the present invention, a system for treating acidic water in a crude benzene hydrogenation process includes a stripping treatment unit, a pretreatment unit and a biochemical treatment unit. The pretreatment unit is composed of a wastewater treatment component and a feeding mechanism 2, wherein the feeding mechanism 2 is arranged on the top of the wastewater treatment component. The feeding mechanism 2 is used to implement the feeding treatment of chemical reagents to the wastewater treatment component.

[0057] The wastewater treatment component includes a double-trough treatment tank 1 for loading wastewater, and the interior of the double-trough treatment tank 1 is provided with a wastewater stirring structure 5 for stirring wastewater, a control cabinet body 8 for controlling the operation of the equipment, and a cleaning mechanism for cleaning the inner cavity. The setting of the wastewater stirring structure 5 enables the wastewater entering the double-trough treatment tank 1 to be mixed and stirred, and the setting of the cleaning mechanism realizes the self-cleaning of the inner cavity of the double-trough treatment tank 1. A switching mechanism 6 for switching the feeding of wastewater is installed on the side wall of the double-trough treatment tank 1, and a waste box 7 for loading sediment is provided below the switching mechanism 6. The setting of the switching mechanism 6 realizes the switching treatment of wastewater in the double-trough treatment tank 1, and the waste box 7 realizes the loading and collection of sediment.

[0058] A wastewater pipe is installed at the discharge end of the stripping treatment unit, and the other end of the wastewater pipe is arranged on the switching mechanism 6 in the pretreatment unit, and a control valve is installed on the wastewater pipe. The control valve is controlled by the program in the control cabinet body 8, and then controls the delivery of wastewater in the wastewater pipe.

[0059] The pretreatment unit and the biochemical treatment unit are connected through a water outlet pipe, which facilitates the treated wastewater to enter the secondary process. The stripping treatment unit is provided with a hot steam pipeline for hot steam transportation, and a shunt pipe for shunt hot steam is installed on the hot steam pipeline through a three-way joint, and the other end of the shunt pipe is arranged on the wastewater stirring structure 5 in the pretreatment unit. The arrangement of the shunt pipe allows part of the hot steam in the hot steam pipeline to enter the wastewater stirring structure 5, thereby not only providing driving force for the operation of the wastewater stirring structure 5, but also allowing the hot steam to enter the double-tank treatment tank 1 to heat the wastewater.

[0060] See also Figure 4-Figure 5 In the embodiment of the present invention, the double-tank treatment tank 1 is composed of a treatment tank body 11 and a partition 12. Among them, there are two partitions 12, both of which are arranged inside the treatment tank body 11. The inner cavity of the treatment tank body 11 is divided into three spaces by two partitions 12, among which the spaces on both sides serve as treatment spaces for treating wastewater, and the middle space serves as a working space for placing structures. Among them, the control cabinet body 8 is arranged in the working space, and a control panel located on the right side of the shell wall of the treatment tank body 11 is arranged on the right side of the working space, which is used to adjust and set the program running by the control cabinet body 8.

[0061] See also Figure 3 In the embodiment of the present invention, the feeding mechanism 2 includes a box cover 21 disposed on the top of the double-trough treatment tank 1, and the box cover 21 is fixed to the treatment tank body 11 by bolts. Two holes are opened on the top shell wall of the box cover 21, and the holes correspond to the treatment space.

[0062] A hopper 22 for temporarily storing chemical reagents is provided above the hole, and a guide pipe is installed at the discharge end of the hopper 22. The bottom end of the guide pipe passes through the hole, and a solenoid valve 23 is installed on the guide pipe. By controlling the switch of the solenoid valve 23, the release control of the chemical reagents temporarily stored in the hopper 22 is realized, so as to realize the quantitative processing of the chemical reagents released into the corresponding processing space. The bottom of the outer ring of each hopper 22 is provided with a plurality of struts along the circumferential direction, and the bottom end of the strut is installed on the top outer wall of the box cover 21 by screws. The convenient assembly of the strut on the box cover 21 facilitates its disassembly, assembly and maintenance, and the setting range of the strut is two to six, and three are used in this embodiment.

[0063] See also Figure 4 , Figure 5 , Fig.12 and Fig.13 In the embodiment of the present invention, a discharge port for discharging sediment is provided on the left shell wall of each treatment space, and a discharge port for discharging treated wastewater is provided on the right shell wall of each treatment space. One end of the outlet pipe is arranged in the discharge port, and the other end of the outlet pipe is installed on the biochemical treatment unit. The connection between the double-trough treatment pool 1 and the biochemical treatment unit is realized by the arrangement of the outlet pipe.

[0064] There are two cleaning mechanisms, each corresponding to the corresponding processing space. The cleaning mechanism is composed of a blocking component 3 and a cleaning component 4. Among them, the blocking component 3 includes a blocking plate 31 for blocking the discharge port, and the outer wall of the blocking plate 31 is symmetrically provided with bent rods 32 in a front-to-back manner. The other ends of the two bent rods 32 penetrate the corresponding side walls of the treatment pool body 11, and are commonly connected with an integration plate 33. The integration plate 33 and the bent rod 32 are assembled by bolt fixing. A reset spring located on the bent rod 32 is sleeved between the integration plate 33 and the left shell wall of the treatment pool body 11. The setting of the reset spring can ensure that the integration plate 33 can reset the blocking plate 31 without the action of external force, thereby realizing the re-blocking operation of the discharge port.

[0065] The cleaning assembly 4 includes a motor 41 mounted on the right outer wall of the treatment pool body 11 by screws, and a reciprocating screw 42 is installed at the output end of the motor 41. The left end of the reciprocating screw 42 penetrates the right shell wall of the treatment pool body 11, and is rotatably connected to the left inner wall of the treatment pool body 11 through a bearing. A guide groove is provided on each partition 12, and a guide member is slidably connected in the guide groove. The guide member is composed of a convex rod and an end plate, wherein the end plate includes two, which are respectively arranged at the two ends of the convex rod, the convex rod is slidably connected in the guide groove, and the two ends of the convex rod respectively penetrate the guide groove.

[0066] A moving seat is threadedly connected to the reciprocating screw 42, and the side wall of the moving seat is installed on the corresponding guide member by screws. A scraper 44 for scraping the bottom inner wall is slidably connected inside each processing space, and a splicing plate 43 is installed on the top of the scraper 44. The end of the splicing plate 43 away from the scraper 44 is installed on the corresponding guide member by bolts, and the splicing plate 43 blocks the corresponding discharge port. The vertical section of the scraper 44 is a triangular structure, and the design of the inclined surface of the scraper 44 makes it difficult for the sediment to accumulate when scraping the sediment, thereby improving the effect of cleaning the sediment in the processing space.

[0067] See also Figure 4-Figure 11 In the embodiment of the present invention, the wastewater stirring structure 5 is composed of a steam driving mechanism 51 and a mixing mechanism 52. The mixing mechanism 52 includes two, which are respectively arranged in the corresponding processing space, and the mixing mechanism 52 and the steam driving mechanism 51 are movably connected.

[0068] The steam drive mechanism 51 includes a shell 511, and a plurality of support legs are arranged on the bottom outer wall of the shell 511 in the circumferential direction, and the bottom ends of the support legs are installed on the bottom inner wall of the working space by screws. The feed end of the shell 511 is connected to the shunt pipe, and the inside of the shell 511 is rotatably connected to the impeller 512 by a pin shaft. The top end of the pin shaft penetrates the top shell wall of the shell 511, and a cam 513 is installed. An annular groove is opened on the peripheral wall of the cam 513, and a slider is slidably connected in the annular groove. An adjustment rod 514 is installed on the outer wall of the slider.

[0069] A slide rail 515 is installed on the top outer wall of the housing 511, a sleeve 516 is slidably connected to the slide rail 515, a carrier plate 517 is installed on the top of the sleeve 516, and the carrier plate 517 is also fixedly connected to the adjustment rod 514. The impeller 512 drives the cam 513 to move through the pin shaft, and the cam 513 drives the carrier plate 517 to perform reciprocating displacement movement through the adjustment rod 514 when it moves, and the arrangement of the slide rail 515 and the sleeve 516 provides stable support and guidance for the movement of the carrier plate 517.

[0070] A through slot is provided on the carrier plate 517, in which a movable bar 518 is slidably connected. Extension rods 519 are installed at both ends of the movable bar 518, and one end of the extension rod 519 away from the movable bar 518 passes through the corresponding side wall of the through slot and is provided with a round table plug.

[0071] The right side of the shell 511 is provided with an air guide 5113 for hot steam transportation, and the air guide 5113 is composed of an air guide pipe 51131 and a sleeve 51132. There are two air guide pipes 51131, which are respectively arranged on the front and rear side walls of the sleeve 51132, and the air guide pipes 51131 and the inner cavity of the sleeve 51132 are connected to each other.

[0072] The housing 511 is connected to the sleeve 51132 through a curved pipe. The sleeve 51132 is internally connected to an arc-shaped blocking plate 5114 for rotation. A rotating shaft is installed at the top of the arc-shaped blocking plate 5114. The top of the rotating shaft penetrates the top shell wall of the sleeve 51132 and is installed with a gear 5115. A rack 5112 meshing with the gear 5115 is provided on the left side of the gear 5115, and the side wall of the rack 5112 is provided on the carrier 5110.

[0073] A spring telescopic rod 5111 is fixedly connected to the carrier 5110, and the output end of the spring telescopic rod 5111 is fixedly connected to the movable bar 518. When the displacement adjustment of the carrier 5110 synchronously drives the rack 5112 to move, the spring telescopic rod 5111 also drives the movable bar 518 to synchronously move, and then the rack 5112 engages the gear 5115 to realize the rotation switching of the arc-shaped blocking plate 5114, thereby realizing the blocking adjustment of the passage state of the two air guide tubes 51131.

[0074] The mixing mechanism 52 includes a hollow tube 521, and support tubes 522 are installed on the front and rear side walls of the hollow tube 521. The inner cavities of the support tube 522 and the hollow tube 521 are mutually connected, and the hot steam entering the support tube 522 will enter the hollow tube 521. Each support tube 522 is sleeved with an end sleeve 523 at one end away from the hollow tube 521, and the end sleeve 523 is installed on the top wall of the processing space by screws. The setting of the end sleeve 523 not only blocks the end of the support tube 522, but also facilitates the assembly of the mixing mechanism 52 on the double-trough treatment tank 1.

[0075] The hollow tube 521 is movably connected to the main tube 524, and a plurality of loading holes are linearly opened on the bottom shell wall of the main tube 524, and a sub-pipe rack 526 for stirring wastewater is installed in the loading hole. The sub-pipe rack 526 and the inner cavity of the main tube 524 are mutually conductive, and the main tube 524 and the inner cavity of the hollow tube 521 are also mutually conductive. Then, the hot steam in the hollow tube 521 will enter each sub-pipe rack 526 after entering the main tube 524, and then be input into the current processing space by each sub-pipe rack 526. A convex block is arranged on the top of the outer ring of the main tube 524, and a straight plate 525 is installed on the top of the convex block. Passage grooves are opened on the top and bottom shell walls of the hollow tube 521, and the lower passage groove is used to facilitate the movement and adjustment of the sub-pipe rack 526, while the upper passage groove is used to facilitate the movement and adjustment of the convex block.

[0076] A through slot is provided on the straight plate 525, and the vertical section of the through slot is inclined, so as to facilitate the tightness of the movable contact between the truncated cone plug and the through slot. The ends of the air guide tubes 51131 away from the sleeve 51132 are respectively installed on the corresponding support tubes 522.

[0077] See also Figure 4 , Figure 5 and Fig.14 In the embodiment of the present invention, the switching mechanism 6 includes a shell 61 installed on the left outer wall of the double tank treatment tank 1 by screws. The shell 61 is connected to the wastewater pipe, and a rectangular through groove and a circular hole are opened on the right shell wall of the shell 61. There are two circular holes, which are respectively located at the front and rear sides of the rectangular through groove, and a delivery pipe is installed in each circular hole, and the end of the water delivery pipe away from the circular hole extends into the corresponding treatment space.

[0078] The housing 61 is slidably connected with a slide plate 63, and a lug plate is integrally provided on the right side of the housing 61. A rectangular through slot is extended from the side of the lug plate away from the slide plate 63. The slide plate 63 is provided to block the rectangular through slot to prevent the waste water entering the housing 61 from being discharged from the rectangular through slot. The left end of the carrier 5110 is fixedly connected to the lug plate by bolts. The slide plate 63 synchronously drives the movement of the carrier 5110 during displacement adjustment.

[0079] A leaf plate 62 is symmetrically arranged on the left inner wall of the housing 61, and the leaf plate 62 cooperates with the end of the slide plate 63 to achieve the blocking of the inner cavity space of the housing 61. An electric push rod 64 is installed on the right outer wall of the housing 61, and the output end of the electric push rod 64 is installed on the ear plate. The electric push rod 64 adjusts the displacement of the slide plate 63, and then controls the blocking state of each conveying pipe when the end of the slide plate 63 cooperates with the leaf plate 62.

[0080] The present invention provides a method for treating an acidic water treatment system in a crude benzene hydrogenation process, the method comprising the following steps:

[0081] Step 1. Set up a pretreatment unit: Set up a pretreatment unit between the stripping treatment unit and the biochemical treatment unit to pretreat the wastewater after the stripping treatment again, reduce the impurity content of the wastewater when it enters the biochemical treatment unit, thereby reducing the processing burden of the biochemical treatment unit, and extending the service life of the biochemical treatment unit while improving the wastewater treatment effect.

[0082] The stripping treatment unit is mainly a stripping tower, and the wastewater pipeline at the discharge end of the stripping tower is connected to the switching mechanism 6 in the pretreatment unit. The outlet pipe on the double tank treatment tank 1 is connected to the biochemical treatment unit, and then the pretreated wastewater is input into the biochemical treatment unit through the outlet pipe. The hot steam input into the stripping tower passes through a combination of a three-way joint and a diverter pipe, and then the hot steam pipeline is diverted to the wastewater stirring structure 5, providing driving force for the operation of the wastewater stirring structure 5.

[0083] Step 2. Setting of the predetermined program: The control cabinet body 8 is programmed through the control panel arranged on the side outer wall of the double-trough treatment tank 1, and then the operation of the control valve on the wastewater pipe, the solenoid valve 23 on the feed pipe in the feeding mechanism 2, the electric push rod 64 in the switching mechanism 6 and the motor 41 in the cleaning component 4 are controlled.

[0084] Step 3: Use the pretreatment unit to treat the wastewater:

[0085] The first step is the stripping treatment of acidic water: the acidic water is transported to the stripping tower through the acidic water pipeline, and the acidic water meets the hot steam entering the stripping tower through the self-heating steam pipeline, thereby realizing the stripping treatment of the acidic water, and the wastewater after the stripping treatment enters the wastewater pipeline for discharge.

[0086] Step 2: Wastewater pretreatment: The program in the control cabinet body 8 starts the electric push rod 64 in the switching mechanism 6, so that the slide plate 63 moves forward. Then the front leaf plate 62 is separated from the front end of the slide plate 63, and the rear leaf plate 62 is in contact with the rear end of the slide plate 63, so that the front conveying pipe is in a conducting state, and the rear conveying pipe is in a closed state.

[0087] Then, the control valve and the electromagnetic valve 23 at the corresponding position are opened, so that the wastewater in the wastewater pipe enters the corresponding treatment space in the double-trough treatment tank 1. The opening of the electromagnetic valve 23 allows the chemical reagent in the hopper 22 to be put into the treatment space. The chemical reagent meets and mixes with the wastewater in the treatment space. The control valve and the corresponding electromagnetic valve 23 are automatically closed after being opened for a period of time, thereby ensuring the quantitative delivery of chemical reagents and wastewater.

[0088] The third step is to mix the wastewater in the treatment space: when the electric push rod 64 is in operation, it synchronously drives the steam drive mechanism 51 in the wastewater mixing structure 5 to move the carrier 5110. The spring telescopic rod 5111 provided on the carrier 5110 is connected to the movable bar 518, and then the movement of the carrier 5110 causes the rack 5112 to move synchronously with the movable bar 518. The movable bar 518 drives the extension rods 519 at both ends to move, and then the truncated cone plug on the extension rod 519 at the front position extends into the through groove of the straight plate 525 in the corresponding mixing mechanism 52. When the truncated cone plug enters the through groove, the truncated cone plug and the inner wall of the through groove push against the limit position.

[0089] The gear rack 5112 and the gear 5115 are meshed and driven to drive the arc-shaped blocking plate 5114 to rotate 180 degrees to achieve blocking switching. At this time, the hot steam entering the housing 511 from the diverter pipe drives the impeller 512 to rotate, and then enters the air guide 5113 from the curved pipe. Then, it passes through the sleeve 51132 in the air guide 5113 and the corresponding unblocked air guide 51131 and enters the support pipe 522 in the corresponding mixing mechanism 52.

[0090] Thus, the hot steam enters the corresponding treatment space through the main pipe 524 and the auxiliary pipe rack 526 to heat the wastewater in the treatment space. The injection of hot steam into the wastewater in the treatment space heats the wastewater, thereby weakening the acidic effect of the wastewater, and further accelerates the mixing efficiency and uniformity between the chemical reagent and the wastewater.

[0091] When the impeller 512 rotates, the cam 513 is synchronously driven to move through the pin shaft, and then the carrier plate 517 is reciprocated through the adjusting rod 514. The main pipe 524 in the mixing mechanism 52 that contacts the round cone plug is driven to reciprocate, so that the auxiliary pipe rack 526 in the mixing mechanism 52 can stir the wastewater in the treatment space, thereby improving the uniformity of the mixing of the wastewater and the chemical reagent in the treatment space.

[0092] Step 4: Wastewater switching and static sedimentation: After the wastewater in the front treatment space is mixed, the control program in the control cabinet body 8 starts the electric push rod 64 again, so that the leaf plate 62 moves backward. Then the front delivery pipe is blocked, the rear delivery pipe is opened, and the control valve and the corresponding solenoid valve 23 are opened again. The wastewater in the wastewater pipe enters the treatment space at the rear. The opening of the solenoid valve 23 causes the chemical reagent in the hopper 22 to fall into the corresponding treatment space.

[0093] The operation of the electric push rod 64 causes the carrier 5110 in the steam drive mechanism 51 to move synchronously, thereby causing the rack 5112 and the movable bar 518 to move in the opposite direction. The truncated cone plug on the front extension rod 519 is disengaged from the corresponding mixing mechanism 52, while the truncated cone plug on the rear extension rod 519 extends into the through groove of the straight plate 525 in the corresponding mixing mechanism 52. Thus, when the carrier plate 517 moves, the movement of the corresponding mixing mechanism 52 is driven synchronously. The operation of the rack 5112 causes the gear 5115 to move in the opposite direction, thereby causing the arc-shaped blocking plate 5114 to rotate 180 degrees in the opposite direction synchronously to achieve the switching adjustment of the blocking. At this time, the wastewater in the treatment space on the rear side is subjected to the same mixing treatment as the wastewater in the treatment space on the front side. The wastewater in the treatment space on the front side is in a static state, which is convenient for the sedimentation of the sediment in the wastewater there.

[0094] The fifth step is the discharge of treated wastewater and the cleaning of the treatment space: when the wastewater in the rear treatment space is mixed and before the wastewater is switched for treatment again, the control program in the control cabinet body 8 turns on the cleaning mechanism in the treatment space that has been left stationary. Start the motor 41 in the cleaning assembly 4 to rotate the reciprocating screw 42, thereby causing the corresponding guide member to move. The movement of the guide member simultaneously drives the splicing plate 43 and the scraper 44 to move. With the displacement of the splicing plate 43, the discharge port on the treatment space lacks blocking, thereby causing the wastewater that has been left stationary to enter the biochemical treatment unit through the outlet pipe. The scraper 44 scrapes the bottom inner wall of the treatment space during the movement to scrape off the settled sediment. As the scraper 44 contacts the integration plate 33 in the plugging assembly 3, the continuous displacement of the scraper 44 pushes against it, causing the bent rod 32 to move, compressing the reset spring and opening the plugging plate 31. The sediment is discharged from the unloading port into the waste box 7 below, and the reverse movement of the guide member causes the splicing plate 43 and the scraper 44 to reset, thereby sealing the discharge port on the treatment space again, preparing for the next wastewater treatment.

[0095] Step 6, continuous treatment of wastewater: The control program in the control cabinet body 8 runs as in the above steps, cyclically, so as to achieve continuous treatment of wastewater in the pretreatment unit and ensure the continuity of wastewater entering the biochemical treatment unit.

[0096] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A system for treating acidic water in a crude benzene hydrogenation process, comprising a stripping treatment unit, a pretreatment unit and a biochemical treatment unit, characterized in that: The pretreatment unit is composed of a wastewater treatment component and a feeding mechanism (2), wherein the feeding mechanism (2) is arranged on the top of the wastewater treatment component; The wastewater treatment component comprises a double-trough treatment tank (1) for loading wastewater, a wastewater stirring structure (5) for stirring wastewater, a control cabinet body (8) for controlling the operation of the equipment and a cleaning mechanism for cleaning the inner cavity are arranged inside the double-trough treatment tank (1), a switching mechanism (6) for switching the feeding of wastewater is installed on the side wall of the double-trough treatment tank (1), and a waste box (7) for loading sediment is arranged below the switching mechanism (6); The double tank treatment tank (1) is composed of a treatment tank body (11) and a partition (12), wherein the partition (12) includes two partitions, both of which are arranged inside the treatment tank body (11), and the inner cavity of the treatment tank body (11) is divided into three spaces by the two partitions (12), wherein the spaces on both sides serve as treatment spaces for treating wastewater, and the middle space serves as a working space for placing structures, wherein the control cabinet body (8) is arranged in the working space; The wastewater stirring structure (5) is composed of a steam driving mechanism (51) and a mixing mechanism (52), wherein the mixing mechanism (52) includes two, which are respectively arranged in the corresponding treatment space, and the mixing mechanism (52) and the steam driving mechanism (51) are movably connected.

2. The acidic water treatment system in a crude benzene hydrogenation process according to claim 1, characterized in that: A wastewater pipe is installed at the discharge end of the stripping treatment unit, the other end of the wastewater pipe is arranged on the switching mechanism (6) in the pretreatment unit, and a control valve is installed on the wastewater pipe. The pretreatment unit and the biochemical treatment unit are connected through a water outlet pipe, so that the treated wastewater can enter the secondary process. A hot steam pipe for hot steam transportation is arranged on the stripping treatment unit, and a diversion pipe for diverting hot steam is installed on the hot steam pipe through a three-way joint, and the other end of the diversion pipe is arranged on the wastewater stirring structure (5) in the pretreatment unit.

3. The acidic water treatment system in a crude benzene hydrogenation process according to claim 1, characterized in that: The feeding mechanism (2) comprises a box cover (21) arranged on the top of the double-trough treatment tank (1), the box cover (21) and the treatment tank body (11) are fixed by bolts, and a plurality of holes are opened on the top shell wall of the box cover (21), and the holes correspond to the treatment space; A hopper (22) for temporarily storing chemical reagents is provided above the hole, a material guide pipe is installed at the discharge end of the hopper (22), the bottom end of the material guide pipe passes through the hole, and a solenoid valve (23) is installed on the material guide pipe, and a plurality of support rods are provided at the bottom of the outer ring of each hopper (22) along the circumferential direction, and the bottom ends of the support rods are installed on the top outer wall of the box cover (21) by screws.

4. The acidic water treatment system in a crude benzene hydrogenation process according to claim 2, characterized in that: A discharge port for discharging sediment is provided on the left shell wall of each of the treatment spaces, and a discharge port for discharging treated wastewater is provided on the right shell wall of each of the treatment spaces, one end of the outlet pipe is arranged in the discharge port, and the other end of the outlet pipe is installed on the biochemical treatment unit; The cleaning mechanism comprises two, each corresponding to a corresponding processing space, and the cleaning mechanism is composed of a blocking component (3) and a cleaning component (4), wherein the blocking component (3) comprises a blocking plate (31) for blocking the discharge port, and curved rods (32) are symmetrically arranged on the outer wall of the blocking plate (31) in a front-to-back manner, and the other ends of the two curved rods (32) both penetrate the corresponding side walls of the processing tank body (11) and are connected to an integration plate (33), and a return spring located on the curved rod (32) is sleeved between the integration plate (33) and the left shell wall of the processing tank body (11); The cleaning assembly (4) comprises a motor (41) mounted on the right outer wall of the treatment pool body (11) by screws, a reciprocating screw (42) being mounted on the output end of the motor (41), the left end of the reciprocating screw (42) penetrating the right shell wall of the treatment pool body (11) and being rotatably connected to the left inner wall of the treatment pool body (11) by a bearing, a guide groove being provided on each of the partitions (12), a guide member being slidably connected in the guide groove, a movable seat being threadedly connected on the reciprocating screw (42), the side wall of the movable seat being mounted on the corresponding guide member by screws, a scraper (44) for scraping the bottom inner wall being slidably connected inside each treatment space, a splicing plate (43) being mounted on the top of the scraper (44), the end of the splicing plate (43) away from the scraper (44) being mounted on the corresponding guide member by bolts, and the splicing plate (43) blocks the corresponding discharge port.

5. The acidic water treatment system in a crude benzene hydrogenation process according to claim 2, characterized in that: The steam driving mechanism (51) comprises a shell (511) arranged in the working space, the shell (511) is connected to the shunt pipe, and the shell (511) is rotatably connected to an impeller (512) via a pin shaft, the top end of the pin shaft penetrates the top shell wall of the shell (511) and is provided with a cam (513), and an adjusting rod (514) is slidably connected to the peripheral wall of the cam (513); A slide rail (515) is installed on the top outer wall of the shell cover (511), and a slide sleeve (516) is slidably connected to the slide rail (515). A carrier plate (517) is installed on the top of the slide sleeve (516), and the carrier plate (517) and the adjustment rod (514) are also fixedly connected. A movable bar (518) is slidably connected to the carrier plate (517), and extension rods (519) are installed at both ends of the movable bar (518), and a round cone plug is provided at one end of the extension rod (519) away from the movable bar (518).

6. The acidic water treatment system in a crude benzene hydrogenation process according to claim 5, characterized in that: An air guide (5113) for hot steam transportation is provided on the right side of the shell cover (511), and the air guide (5113) is composed of an air guide pipe (51131) and a sleeve (51132), wherein the air guide pipes (51131) include two air guide pipes, which are respectively arranged on the front and rear shell walls of the sleeve (51132), and the inner cavities of the air guide pipes (51131) and the sleeve (51132) are in communication with each other; The shell cover (511) and the sleeve (51132) are connected via a bent pipe. The sleeve (51132) is internally rotatably connected with an arc-shaped sealing plate (5114). A rotating shaft is installed at the top of the arc-shaped sealing plate (5114). The top of the rotating shaft penetrates the top shell wall of the sleeve (51132) and is installed with a gear (5115). A rack (5112) meshing with the gear (5115) is provided on the left side of the gear (5115). A carrier (5110) is arranged on the side wall of the rack (5112). A spring telescopic rod (5111) is fixedly connected to the carrier (5110). The output end of the spring telescopic rod (5111) is fixedly connected to the movable bar (518).

7. The acidic water treatment system in a crude benzene hydrogenation process according to claim 6, characterized in that: The mixing mechanism (52) comprises a hollow tube (521), support tubes (522) are installed on the front and rear side walls of the hollow tube (521), the support tubes (522) and the inner cavity of the hollow tube (521) are connected to each other, and an end sleeve (523) is sleeved on one end of each support tube (522) away from the hollow tube (521), and the end sleeve (523) is installed on the top wall of the processing space by screws; The hollow tube (521) is movably connected to a main tube (524) inside, and a plurality of auxiliary tube racks (526) for stirring wastewater are linearly distributed on the bottom shell wall of the main tube (524) in a transverse manner. The auxiliary tube racks (526) and the inner cavity of the main tube (524) are mutually conductive, and the main tube (524) and the inner cavity of the hollow tube (521) are also mutually conductive. A convex block is arranged on the top of the outer ring of the main tube (524), and a straight plate (525) is installed on the top of the convex block; The straight plate (525) is provided with a through groove, the truncated cone plug is in movable contact with the through groove, and one end of the air guide tube (51131) away from the sleeve (51132) is respectively installed on the corresponding support tube (522).

8. The acidic water treatment system in a crude benzene hydrogenation process according to claim 6, characterized in that: The switching mechanism (6) comprises a shell (61) mounted on the left outer wall of the double-tank treatment tank (1) by screws, the shell (61) being connected to the wastewater pipe, and a rectangular through slot and a circular hole are provided on the right shell wall of the shell (61), wherein there are two circular holes, which are respectively located at the front and rear sides of the rectangular through slot, and a delivery pipe is installed in each circular hole, and an end of the water delivery pipe away from the circular hole extends into the corresponding treatment space; The shell (61) is slidably connected to a slide plate (63) inside, and an ear plate is integrally provided on the right shell wall of the slide plate (63). A rectangular through groove extends from the ear plate on the side away from the slide plate (63), and the left end of the carrier (5110) is fixedly connected to the ear plate by bolts.

9. The acidic water treatment system in a crude benzene hydrogenation process according to claim 8, characterized in that: A page plate (62) is symmetrically arranged on the left inner wall of the shell (61), and the cooperation between the page plate (62) and the end of the slide plate (63) realizes the blocking of the inner cavity space of the shell (61). An electric push rod (64) is installed on the right outer wall of the shell (61), and the output end of the electric push rod (64) is installed on the ear plate.

10. A method for treating an acidic water treatment system in a crude benzene hydrogenation process according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: Step 1: Setting a pretreatment unit: Setting a pretreatment unit between the stripping treatment unit and the biochemical treatment unit, so as to pretreat the wastewater after the stripping treatment again, reduce the impurity content of the wastewater when it enters the biochemical treatment unit, connect the wastewater pipeline at the discharge end of the stripping treatment unit to the switching mechanism (6), connect the outlet pipe on the double tank treatment tank (1) to the biochemical treatment unit, and the hot steam input into the stripping treatment unit is diverted from the hot steam pipeline to the wastewater stirring structure (5) through a combination of a three-way joint and a diverter pipe; Step 2: Setting a predetermined program: Programming the control cabinet body (8) is performed through a control panel arranged on the side outer wall of the double-tank treatment tank (1), thereby controlling the operation of the control valve on the wastewater pipeline, the solenoid valve (23) on the guide pipe in the feeding mechanism (2), the electric push rod (64) in the switching mechanism (6), and the motor (41) in the cleaning component (4); Step 3: Use the pretreatment unit to treat the wastewater: The first step is the stripping treatment of acidic water: the acidic water is transported to the stripping treatment unit through the acidic water pipeline, and the acidic water meets the hot steam entering the stripping treatment unit through the self-heating steam pipeline, thereby realizing the stripping treatment of the acidic water, and the wastewater after the stripping treatment enters the wastewater pipeline; The second step is wastewater pretreatment: the program in the control cabinet body (8) first starts the electric push rod (64) in the switching mechanism (6), so that the slide plate (63) moves forward, and then the front leaf plate (62) is separated from the front end of the slide plate (63), and the rear leaf plate (62) is in contact with the rear end of the slide plate (63), so that the front conveying pipe is in a conducting state, and the rear conveying pipe is in a closed state, and then the control valve and the electromagnetic valve (23) at the corresponding position are opened, so that the wastewater in the wastewater pipeline enters the corresponding treatment space in the double-trough treatment tank (1), and the opening of the current electromagnetic valve (23) causes the chemical reagent in the hopper (22) to be put into the treatment space, and the control valve and the corresponding electromagnetic valve (23) are automatically closed after being opened for a period of time, thereby ensuring the quantitative delivery of chemical reagents and wastewater; The third step is to mix the wastewater in the treatment space: when the electric push rod (64) is in operation, it synchronously drives the displacement of the carrier (5110) in the steam drive mechanism (51). The movement of the carrier (5110) causes the rack (5112) and the movable bar (518) to move. The movable bar (518) drives the extension rod (519) to move, and then the round cone plug on the extension rod (519) extends into the through groove of the straight plate (525) in the corresponding mixing mechanism (52). The rack (5112) and the gear (5115) are meshed and driven, thereby driving the arc-shaped blocking plate (5114) to rotate 180 degrees to realize blocking switching. At this time, the hot steam entering the shell cover (511) from the diverter pipe is blown. After the impeller (512) rotates, it enters the air guide (5113) from the curved pipe, and then enters the support pipe (522) in the corresponding mixing mechanism (52) through the air guide (5113), thereby, the hot steam enters the corresponding treatment space through the main pipe (524) and the auxiliary pipe rack (526), ​​and heats the wastewater in the treatment space. When the impeller (512) rotates, it simultaneously drives the cam (513) to move, and the carrier plate (517) moves back and forth through the adjustment rod (514), thereby driving the main pipe (524) in the mixing mechanism (52) that contacts the truncated cone plug to move back and forth, thereby improving the uniformity of mixing the wastewater and the chemical reagent in the treatment space; Step 4: wastewater switching and static sedimentation: After the wastewater in the front treatment space is mixed, the control program in the control cabinet body (8) starts the electric push rod (64) again, causing the leaf plate (62) to move backward, thereby blocking the front delivery pipe, opening the rear delivery pipe, and opening the control valve and the corresponding solenoid valve (23) again. The wastewater in the wastewater pipe enters the rear treatment space, and the operation of the electric push rod (64) causes the carrier (5110) in the steam drive mechanism (51) to move synchronously, thereby causing the rack (5112) and the movable bar (518) to move in the opposite direction, and the front extension rod The conical plug on (519) is separated from the corresponding mixing mechanism (52), and the conical plug on the rear extension rod (519) extends into the through groove of the straight plate (525) in the corresponding mixing mechanism (52), and the operation of the rack (5112) causes the gear (5115) to move in the reverse direction, and then the arc-shaped blocking plate (5114) synchronously rotates 180 degrees in the reverse direction to achieve the switching adjustment of the blocking. At this time, the wastewater in the treatment space on the rear side is subjected to the same mixing treatment as the wastewater in the treatment space on the front side, while the wastewater in the treatment space on the front side is in a static state, which facilitates the sedimentation of the sediment in the wastewater there; The fifth step is to discharge the treated wastewater and clean the treatment space: when the wastewater in the rear treatment space is mixed and before the wastewater is switched for treatment again, the control program in the control cabinet body (8) turns on the cleaning mechanism in the treatment space that has been left stationary, starts the motor (41), rotates the reciprocating screw (42), and then moves the corresponding guide member. The movement of the guide member simultaneously drives the splicing plate (43) and the scraper (44) to move. With the displacement of the splicing plate (43), the discharge port on the treatment space is not blocked, and the stationary wastewater is discharged. Water enters the biochemical treatment unit through the outlet pipe, and the scraper (44) scrapes the bottom inner wall of the treatment space during movement, thereby scraping off the settled sediment. As the scraper (44) contacts the integration plate (33) in the plugging assembly (3), the continuous displacement of the scraper (44) pushes against it, causing the bent rod (32) to move, compressing the reset spring, opening the plugging plate (31), and the sediment is discharged from the unloading port into the waste box (7) below, and the reverse movement of the guide member causes the splicing plate (43) and the scraper (44) to reset; Step 6: Continuous treatment of wastewater: The control program in the control cabinet body (8) runs as described above, cyclically, so as to achieve continuous treatment of wastewater in the pretreatment unit and ensure the continuity of wastewater entering the biochemical treatment unit.

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