Catalytic oxidation equipment and method in a coking wastewater reuse process

Abstract

The application discloses a kind of catalytic oxidation equipment and method in coking wastewater reuse process, comprising: base platform, reaction mechanism, pretreatment mechanism, controller, sedimentation tank, filter press equipment and storage device;Reaction mechanism is set in the top rear side of the base platform;Pretreatment mechanism is set in the top left side of the base platform;Sedimentation tank is opened in the top of the base platform and is located in the right front of reaction mechanism;Filter press equipment is set in the top of the base platform and is located in the right side of sedimentation tank.The special oil removal system is accurately captured emulsified oil, reduces wastewater oil, adjusts pH at the same time, greatly improves the adaptability of subsequent catalytic oxidation reaction basic conditions, and in the use liquid medicine multipoint dosing and solid medicine gas-solid two-phase flow timing multipoint dosing technology, improve the uniformity of medicine and wastewater, avoid local concentration too high caused by medicine waste and reaction insufficient problem.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a catalytic oxidation device and method for a coking wastewater reuse process. Background Technology

[0002] Coking wastewater is a type of industrial wastewater with complex composition and high pollution intensity generated during the high-temperature dry distillation, gas purification, and coking product recovery of coal. Its water quality has significant unique characteristics. On the one hand, it contains high concentrations of recalcitrant organic matter, including phenols, benzene compounds, polycyclic aromatic hydrocarbons, and heterocyclic compounds. These substances have stable chemical structures, poor biodegradability, and some are even biotoxic. On the other hand, it also contains high concentrations of inorganic pollutants, such as ammonia nitrogen, cyanide, thiocyanate, and heavy metal ions. Furthermore, the wastewater exhibits large pH fluctuations, high temperatures, and is accompanied by oily substances and suspended solids. Direct discharge or reuse without effective treatment will not only severely pollute water bodies and soil, threatening aquatic life and human health, but also cause equipment corrosion and pipeline blockage during reuse due to substandard water quality, affecting the normal production of coking enterprises.

[0003] In the existing technology field, coking wastewater after biological treatment still retains emulsified oil. When traditional processes directly enter the catalytic oxidation unit, a stable oil film forms on the liquid surface, hindering oxygen transfer. The oil film adsorbs hydroxyl radicals and encapsulates catalyst particles, affecting treatment efficiency. Furthermore, in the catalytic oxidation stage, existing processes often discharge ferrous sulfate and hydrogen peroxide directly into the reaction tank through a single pipe, forming a jet impact zone that results in excessively high local concentrations. Excessive ferrous sulfate in a localized area can cause quenching reactions between iron ions and hydroxyl radicals, while excessive hydrogen peroxide in a localized area can lead to ineffective decomposition. In addition, the traditional method of adding sodium hydroxide using a screw conveyor for direct feeding is prone to deliquescence and agglomeration, causing pipe blockage. Moreover, single-point addition creates a pH gradient in the reaction tank, resulting in inconsistent precipitate morphologies, with some forming colloids that are difficult to separate. Summary of the Invention

[0004] The purpose of this invention is to provide a catalytic oxidation device and method for coking wastewater reuse processes, so as to at least solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a catalytic oxidation device for coking wastewater reuse, comprising:

[0006] Base platform;

[0007] The reaction mechanism is located at the rear top of the base platform;

[0008] A pre-processing mechanism is located on the top left side of the base platform;

[0009] a controller, installed on the top end of the base platform and located at the right side of the reaction mechanism;

[0010] a sedimentation tank, opened on the top end of the base platform and located at the right front of the reaction mechanism;

[0011] a filter press device, arranged on the top end of the base platform and located at the right side of the sedimentation tank, the liquid inlet pipe of the filter press device extending into the inner cavity of the sedimentation tank, the filter press device and the controller being electrically connected;

[0012] a storage device, arranged on the top end of the base platform and located at the right front of the reaction mechanism, the liquid outlet pipe of the filter press device being connected with the liquid inlet port of the storage device, the storage device and the controller being electrically connected.

[0013] Preferably, the reaction mechanism comprises a reaction tank, a high-level platform, a liquid delivery machine, a solid delivery component, a spray pipe, a truss and a first stirring device; the reaction tank is installed on the top end of the base platform at the rear side along the left-right direction, the liquid outlet pipe of the reaction tank extending into the inner cavity of the sedimentation tank, the reaction tank and the controller being electrically connected; the high-level platform is installed on the top end of the base platform and located at the right side of the reaction tank; the liquid delivery machine is installed on the top end of the high-level platform at the front side, the liquid delivery machine and the controller being electrically connected; the solid delivery component is arranged on the top end of the high-level platform at the rear side; the number of the spray pipes is several, the several spray pipes being installed at the top end of the inner cavity of the reaction tank from left to right at intervals, the spray pipes and the liquid outlet port of the liquid delivery machine being connected through pipelines; the number of the trusses is several, the several trusses being installed at the top end of the reaction tank along the front-rear direction at intervals; the number of the first stirring devices is several, the several first stirring devices being fixedly installed inside the several trusses, the stirring paddles of the first stirring devices extending into the inner cavity of the reaction tank, the first stirring devices and the controller being electrically connected.

[0014] Preferably, the solid feeding component comprises a box shell, a solid conveying device, an axial flow fan, a conveying cylinder, a beam pipe, a connecting cover, a centrifugal fan, a connecting air duct, a filter screen plate, a feeding channel and a solenoid valve; the box shell is installed at the top rear side of the high-level platform along the left-right direction; the solid conveying device is installed at the top of the box shell, and the solid conveying device is electrically connected with the controller; the axial flow fan is installed inside the right opening of the box shell, and the axial flow fan is electrically connected with the controller; the conveying cylinder is installed at the left side of the bottom of the inner cavity of the box shell through a support along the left-right direction; the beam pipe is installed inside the right opening of the inner cavity of the conveying cylinder; the connecting cover is installed at the left side of the air outlet of the axial flow fan, and the outlet of the connecting cover is connected with the inlet of the beam pipe; the centrifugal fan is installed at the front side outside the box shell, and the centrifugal fan is electrically connected with the controller; the connecting air duct is installed at the bottom of the conveying cylinder and below the top feeding port of the conveying cylinder, the top of the connecting air duct is communicated with the inner cavity of the conveying cylinder, the front side of the connecting air duct extends outside the box shell and is connected with the air outlet of the centrifugal fan; the filter screen plate is installed at the top inside of the connecting air duct; the feeding channel is installed at the left side of the box shell, the left end of the feeding channel extends above the reaction pool, the right end of the feeding channel extends into the inner cavity of the box shell and is communicated with the left side of the inner cavity of the conveying cylinder; the solenoid valve is installed above the top feeding port of the inner cavity of the conveying cylinder, the top feeding port of the solenoid valve is connected with the bottom discharge port of the solid conveying device, and the solenoid valve is electrically connected with the controller; wherein the inside of the feeding channel is provided with discharge units from left to right.

[0015] Preferably, the gas outlet of the beam pipe is conical.

[0016] Preferably, the discharging unit comprises: limiting telescopic rods, a first electric telescopic rod, a U-shaped frame, second electric telescopic rods, rotating seats, gear sets, micro electric telescopic rods, a feeding groove and a sealing plate; the number of the limiting telescopic rods is two, and the two limiting telescopic rods are respectively embedded in the holes on the top of the feeding channel; the first electric telescopic rod is installed at the top of the feeding channel and located inside the two limiting telescopic rods, the telescopic end of the first electric telescopic rod extends into the inner cavity of the feeding channel, and the first electric telescopic rod is electrically connected with the controller; the U-shaped frame is installed at the bottom of the telescopic end of the first electric telescopic rod, and the top of the U-shaped frame is connected with the bottom of the telescopic end of the two limiting telescopic rods; the number of the second electric telescopic rods is two, and one end of the two second electric telescopic rods is respectively rotatably connected to the top of the U-shaped frame through rotating shafts; the second electric telescopic rods are electrically connected with the controller; the number of the rotating seats is two, and the two rotating seats are rotatably connected to the inner sides of the U-shaped frame through rotating shafts; the shafts of the rotating seats extend out of the U-shaped frame; the number of the gear sets is two, and the lower gears of the two gear sets are connected to the outer ends of the shafts of the rotating seats through gear keys; the upper gears of the two gear sets are rotatably connected to the top of the U-shaped frame through rotating shafts; the telescopic ends of the two second electric telescopic rods are rotatably connected to the outer sides of the upper gears of the two gear sets through rotating shafts; the number of the micro electric telescopic rods is two, and the two micro electric telescopic rods are respectively installed on the inner sides of the two rotating seats; the micro electric telescopic rods are electrically connected with the controller; the feeding groove is arranged at the bottom of the inner cavity of the feeding channel and below the U-shaped frame; and the sealing plate is arranged on the inner side of the feeding groove, and the top of the feeding groove is connected with the bottom of the telescopic end of the two micro electric telescopic rods.

[0017] Preferably, the pretreatment mechanism comprises: a water tank shell, a partition, a connecting pipe, a feeding device, a second stirring device, a first pump body, a second pump body, a liquid storage tank, a third pump body and a buoyancy net cylinder; the water tank shell is installed on the top left side of the base platform in the front-rear direction; the partition is arranged in the inner cavity of the water tank shell, and the inner cavity of the water tank shell is divided into two parts by the partition; the connecting pipe is installed on the outer left side of the front end of the water tank shell, and the connecting pipe is in communication with the left front top end of the inner cavity of the front side of the water tank shell; the feeding device is installed on the top left rear side of the water tank shell, and the discharge port of the feeding device is connected with the top feeding port of the inner cavity of the rear side of the water tank shell; the feeding device and the controller are electrically connected; the second stirring device is installed on the top of the water tank shell, and the stirring paddle of the second stirring device extends into the inner part of the inner cavity of the rear side of the water tank shell; the second stirring device and the controller are electrically connected; the first pump body is installed on the outer rear side of the water tank shell through a support, the liquid inlet of the first pump body is connected with the liquid outlet of the inner cavity of the rear side of the water tank shell, the liquid outlet pipe of the first pump body is connected with the liquid inlet of the reaction tank, and the first pump body and the controller are electrically connected; the second pump body is installed on the top of the water tank shell, the liquid inlet pipe of the second pump body extends into the inner cavity of the front side of the water tank shell, the liquid outlet pipe of the second pump body extends into the inner cavity of the rear side of the water tank shell, and the second pump body and the controller are electrically connected; the liquid storage tank is installed on the top right front side of the water tank shell; the third pump body is installed on the top of the water tank shell and located on the right side of the liquid storage tank, the liquid inlet pipe of the third pump body extends into the inner cavity of the front side of the water tank shell, the liquid outlet pipe of the third pump body is connected with the liquid inlet of the liquid storage tank, and the third pump body and the controller are electrically connected; the number of the buoyancy net cylinders is two, and the two buoyancy net cylinders are respectively installed on the front and rear sides of the liquid inlet pipe of the third pump body.

[0018] A catalytic oxidation method in a coking wastewater recycling process, comprising the following steps:

[0019] S1, pretreatment:

[0020] After biological treatment, the coking wastewater flows into the front side area of the water tank shell of the pretreatment mechanism through the connecting pipe, and the related equipment is started by the controller:

[0021] Oil removal: the third pump body generates negative pressure, and the oil film on the surface of the wastewater is adsorbed by the buoyancy net cylinder and transported to the liquid storage tank for separate storage, so as to avoid the oil film from hindering the subsequent reagent mixing and mass transfer;

[0022] pH adjustment: the second pump body pumps the wastewater after oil removal to the rear side area of the water tank shell, the feeding device adds sulfuric acid solution according to the preset dosage, and the second stirring device continuously stirs to fully mix the solution and the wastewater, so as to adjust the pH to 2-4;

[0023] Wastewater delivery: the first pump body pumps the treated wastewater to the reaction tank of the reaction mechanism, and waits for the catalytic oxidation stage;

[0024] S2, catalytic oxidation:

[0025] Start the reaction-related equipment through the controller, and complete the catalytic oxidation in three steps:

[0026] Fenton reaction preparation: the reaction tank temperature control equipment is started, the wastewater temperature is adjusted to 20-40 DEG C, the liquid delivery machine delivers the ferrous sulfate solution to the spray pipe at a preset flow rate, and the solution is uniformly sprayed on the surface of the wastewater through the spray head. The first stirring device is stirred to preliminarily mix the solution and the wastewater;

[0027] Fenton reaction start: the liquid delivery machine is switched to the hydrogen peroxide delivery mode, the hydrogen peroxide is quantitatively delivered to the spray pipe and uniformly sprayed, the first stirring device is continuously stirred, the hydrogen peroxide reacts with the ferrous ions to generate hydroxyl radicals, and the degradation of the refractory organic matter and the reduction of COD and toxicity are realized;

[0028] Neutralization and iron removal: the solid delivery device delivers the sodium hydroxide powder to the electromagnetic valve at a preset dose, the powder falls on the filter screen plate of the delivery cylinder body, the centrifugal fan is started and closed after blowing the powder for a few seconds, the axial flow fan is started to form a high-speed airflow, the powder is adsorbed and dispersed into a gas-solid two-phase flow and sent into the feeding channel, the discharge units in the feeding channel are started from right to left in turn, the first electric telescopic rod, the second electric telescopic rod and the gear set are matched to make the sealing plate tilt and leave a discharge gap, so that the gas-solid two-phase flow is uniformly dropped into the reaction tank, and the first stirring device continues to stir, so that the sodium hydroxide is mixed with the wastewater, the pH is adjusted to 8-9, the ferrous ions are converted into iron hydroxide flocculent precipitate;

[0029] S3, solid-liquid separation and purified water storage:

[0030] Preliminary precipitation: the mixed liquid in the reaction tank is discharged into the sedimentation tank through the liquid outlet pipe, and is statically precipitated for 30-60 minutes;

[0031] Deep separation: the controller starts the filter pressing equipment, the supernatant in the sedimentation tank is pumped out, the mud is removed through filter cloth filter pressing, the residual fine particles are separated, and the sludge is discharged through the sludge discharge port and then sent to a professional hazardous waste treatment mechanism;

[0032] Storage and reuse: the purified water is delivered to the storage equipment through the filter pressing equipment and temporarily stored, the equipment monitors the water quality in real time, and the subsequent wastewater is delivered to the next treatment unit as needed.

[0033] Compared with the prior art, the beneficial effects of the present application are:

[0034] 1. The oil film in the coking wastewater is drawn into the storage tank through the buoyancy net by the third pump. The second stirring device draws out the coking wastewater from the front part of the inner cavity of the tank and discharges it into the rear part of the inner cavity of the tank. The feeding device quantitatively adds sulfuric acid solution into the rear part of the inner cavity of the tank. The second stirring device stirs the sulfuric acid solution and coking wastewater in the rear part of the inner cavity of the tank to make them fully mixed, thereby adjusting the pH of the coking wastewater in the rear part of the inner cavity of the tank. The first pump draws out the treated coking wastewater in the rear part of the inner cavity of the tank and discharges it into the reaction tank.

[0035] 2. A liquid feeder sequentially and evenly sprays the internal ferrous sulfate solution and hydrogen peroxide onto the surface of the coking wastewater inside the reaction tank via spray pipes, avoiding localized over-dispensing. The first stirring device agitates the liquid inside the reaction tank to ensure thorough mixing. After the reaction, the solid conveying device quantitatively delivers the stored sodium hydroxide solid particles into the inner cavity of the conveying cylinder, where they fall onto the filter screen surface. A centrifugal fan generates a high-pressure airflow that blows the sodium hydroxide particles upwards from the filter screen surface. An axial flow fan generates a high-pressure airflow, which, under the beam of the converging pipe, produces a high-speed airflow that draws in the sodium hydroxide particles from inside the conveying cylinder and disperses them in the airflow, forming a uniform gas-solid two-phase flow before entering the feeding channel. The corresponding discharge unit shortens the U-shaped feeding channel. The frame moves upward, driving the lower sealing plate to detach from the inner cavity of the feeding trough. The second electric telescopic rods on the front and rear sides shorten, driving the upper gear of the gear set at the corresponding position to rotate. The gear below the gear set drives the rotating seat at the corresponding position to rotate the micro electric telescopic rod, so that the sealing plate is rotated to an inclined state through the micro electric telescopic rods on the front and rear sides. The micro electric telescopic rods shorten, driving the sealing plate to move to the left on the feeding trough to reserve the discharge position. The gas-solid two-phase flow impacts the surface of the sealing plate and is fed into the reaction tank through the lower feeding trough along the inclined surface formed by the sealing plate. The discharge unit is activated sequentially from right to left to achieve uniform feeding of sodium hydroxide. The first stirring device continues to stir to ensure a full reaction, thereby causing ferrous ions to form ferric hydroxide precipitate.

[0036] This allows for the precise capture of emulsified oil through a specialized oil removal system, reducing the oil content in wastewater while simultaneously adjusting the pH. This significantly improves the compatibility of the basic conditions for subsequent catalytic oxidation reactions. Furthermore, by employing multi-point dosing technology for liquid reagents and sequential multi-point dosing technology for solid reagents in a gas-solid two-phase flow, the uniformity of reagent mixing with wastewater is improved, avoiding problems such as reagent waste and incomplete reaction caused by excessively high local concentrations. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the present invention;

[0038] Figure 2 for Figure 1 Magnified view of the reaction mechanism;

[0039] Figure 3 is a solid delivery component exploded view; Figure 2

[0040] Figure 4 is an enlarged view of A of Figure 3

[0041] Figure 5 is an enlarged view of B of Figure 3

[0042] Figure 6 is a pretreatment mechanism exploded view of Figure 1

[0043] In the figure: 1, base platform, 2, reaction mechanism, 21, reaction pool, 22, high platform, 23, liquid delivery machine, 24, spray pipe, 25, truss, 26, first stirring device, 3, solid delivery component, 31, box shell, 32, solid conveying device, 33, axial flow fan, 34, conveying cylinder, 35, beam pipe, 36, connecting cover, 37, centrifugal fan, 38, connecting air duct, 39, filter screen plate, 310, feeding channel, 311, limiting telescopic rod, 312, first electric telescopic rod, 313, U-shaped frame, 314, second electric telescopic rod, 315, rotating seat, 316, gear set, 317, micro electric telescopic rod, 318, feeding groove, 319, sealing plate, 320, electromagnetic valve, 4, pretreatment mechanism, 41, water tank shell, 42, partition, 43, connecting pipe, 44, feeding device, 45, second stirring device, 46, first pump body, 47, second pump body, 48, liquid storage tank, 49, third pump body, 410, buoyancy net cylinder, 5, controller, 6, sedimentation tank, 7, filter press equipment, 8, storage equipment. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0045] Please refer to Figures 1-6 ​​​​The application provides a catalytic oxidation equipment in a coking wastewater recycling process, which comprises a base platform 1, a reaction mechanism 2, a pretreatment mechanism 4, a controller 5, a sedimentation tank 6, a filter pressing equipment 7 and a storage equipment 8; the reaction mechanism 2 is arranged at the top rear side of the base platform 1; the pretreatment mechanism 4 is arranged at the top left side of the base platform 1; the controller 5 is installed at the top of the base platform 1 and located at the right side of the reaction mechanism 2, the controller 5 adopts a PLC control cabinet, realizes full-process automation through a preset program, does not need to start the equipment one by one manually, and can display the running state of each equipment, water quality parameters and liquid level in real time; the sedimentation tank 6 is opened at the top of the base platform 1 and located at the right front of the reaction mechanism 2, the sedimentation tank 6 adopts an inclined tube sedimentation tank, is filled with a honeycomb inclined tube inside, is provided with a conical sludge collecting hopper at the bottom, is matched with an electric sludge discharge valve and a liquid level meter, receives the wastewater mixture discharged from the reaction tank 21, greatly shortens the particle sedimentation distance by using the shallow layer sedimentation principle of the inclined tube, makes the iron hydroxide flocculation body quickly settle to the sludge collecting hopper at the bottom, reduces the processing load of the subsequent filter pressing equipment 7, temporarily stores the settled sludge in the sludge collecting hopper, and the controller 5 opens the electric sludge discharge valve to cooperate with manual unified treatment according to the sludge height feedback by the liquid level meter; the filter pressing equipment 7 is arranged at the top of the base platform 1 and located at the right side of the sedimentation tank 6, the liquid inlet pipe of the filter pressing equipment 7 extends into the inner cavity of the sedimentation tank 6, the filter pressing equipment 7 and the controller 5 are electrically connected, the filter pressing equipment 7 is internally integrated with a pneumatic diaphragm pump and an automatic filter press, the pneumatic diaphragm pump pressurizes the liquid in the sedimentation tank 6 and sends it into the filter plate chamber of the automatic filter press, the liquid becomes clear liquid through filter cloth, the filter cake is formed after the suspended matter is intercepted, the filter cake is pressed to reduce the subsequent sludge treatment amount; the storage equipment 8 is arranged at the top of the base platform 1 and located at the right front of the reaction mechanism 2, the liquid outlet pipe of the filter pressing equipment 7 is connected with the liquid inlet of the storage equipment 8, the storage equipment 8 and the controller 5 are electrically connected, the storage equipment 8 selects a vertical PE storage tank, the tank top is provided with a breather valve to prevent negative pressure or overpressure in the tank, and a manhole is convenient for regular maintenance, the tank side is provided with a magnetic reed liquid level meter and a blowdown valve, and the liquid inlet and the liquid outlet are provided with electric gate valves.

[0046] As a preferred solution, further, Figure 2As shown, the reaction mechanism 2 includes: a reaction tank 21, a high-level platform 22, a liquid delivery machine 23, a solid delivery component 3, a spray pipe 24, a truss 25 and a first stirring device 26; the reaction tank 21 is installed at the top rear side of the base platform 1 along the left-right direction, the liquid outlet pipe of the reaction tank 21 extends into the inner cavity of the sedimentation tank 6, the reaction tank 21 is electrically connected with the controller 5, the reaction tank 21 adopts a corrosion-resistant reaction tank, the material is homopolypropylene, it is resistant to strong acid and strong base, it is built-in temperature control system and is equipped with temperature sensor, as the main container of homogeneous Fenton reaction, it contains the coking wastewater after pretreatment, ensures that the wastewater is fully mixed and reacted with ferrous sulfate and hydrogen peroxide, the bottom of the tank is provided with a stainless steel liquid outlet pipe with an electric valve, after the reaction is completed, the mixed liquid containing iron hydroxide precipitate is automatically discharged into the sedimentation tank 6; the high-level platform 22 is installed at the top of the base platform 1 and located at the right side of the reaction tank 21, the high-level platform 22 is a steel auxiliary platform, which makes the equipment height adapt to the feeding demand of the reaction tank 21, the platform reserves a maintenance stair passage, which facilitates the regular inspection of the running state of the device by the staff, and the replenishment of reagents or the replacement of vulnerable parts; the liquid delivery machine 23 is installed at the top front side of the high-level platform 22, the liquid delivery machine 23 is electrically connected with the controller 5, the liquid delivery machine 23 adopts a corrosion-resistant metering pump combined with a medicine storage tank, the medicine storage tank is a PE material storage tank, the medicine storage tank respectively stores ferrous sulfate solution and hydrogen peroxide to avoid early mixing reaction, the built-in liquid level meter feedbacks the reagent remaining amount in real time, sends an alarm signal to the controller 5 when the liquid level is low, and reminds to replenish, the metering pump selects a diaphragm type metering pump, the reagent dosage is accurately controlled through the metering pump, which avoids excessive waste or insufficient reagent leading to substandard treatment; the solid delivery component 3 is arranged at the top rear side of the high-level platform 22; the number of the spray pipes 24 is several, the several spray pipes 24 are installed at the top of the inner cavity of the reaction tank 21 from left to right at intervals, the spray pipes 24 are connected with the discharge port of the liquid delivery machine 23 through pipes, the spray pipes 24 are multi-nozzle pipes, each pipe is provided with multiple fan-shaped nozzles, the ferrous sulfate or hydrogen peroxide of the liquid delivery machine 23 is uniformly sprayed on the surface of the wastewater through the fan-shaped nozzles, which avoids local high reagent concentration caused by single-point addition; the number of the trusses 25 is several, the several trusses 25 are installed at the top of the reaction tank 21 along the front-rear direction at intervals; the number of the first stirring devices 26 is several, the several first stirring devices 26 are fixedly installed in the several trusses 25, the stirring paddle in the first stirring device 26 extends into the inner cavity of the reaction tank 21, the first stirring device 26 is electrically connected with the controller 5, the first stirring device 26 adopts a vertical stirrer, the stirring paddle is a propelling type, the propelling type stirring paddle generates axial flow, drives the wastewater to circulate up and down, thereby providing the required turbulent flow environment for Fenton reaction, making the reagent fully mixed with the wastewater, and ensuring that the hydroxyl radical contacts with the organic matter.

[0047] As a preferred solution, further, Figure 3 , Figure 4 and Figure 5As shown, the solid feeding component 3 includes: a housing 31, a solid conveying device 32, an axial flow fan 33, a conveying cylinder 34, a convection pipe 35, a connecting cover 36, a centrifugal fan 37, a connecting air duct 38, a filter plate 39, a feeding channel 310, and a solenoid valve 320. The housing 31 is installed on the rear top of the high-rise platform 22 along the left-right direction. The solid conveying device 32 is installed on the top of the housing 31 and is electrically connected to the controller 5. The solid conveying device 32 uses a hopper and a screw conveyor to quantitatively convey sodium hydroxide solid particles from the hopper to the solenoid valve 320. The controller 5 adjusts the motor speed to achieve precise control of the feeding amount. The axial flow fan 33 is installed inside the opening on the right side of the housing 31. The axial flow fan 33 and controller 5 are electrically connected. The axial flow fan 33 is a corrosion-resistant axial flow fan, which generates high-pressure airflow that enters the beam duct 35 through the connecting cover 36, forming a high-speed airflow field to provide conveying power for the sodium hydroxide particles. The conveying cylinder 34 is installed on the left side of the bottom of the inner cavity of the housing shell 31 along the left-right direction via a bracket. The conveying cylinder 34 serves as a temporary storage and mixing chamber for the sodium hydroxide particles. The inner wall is mirror-polished to reduce powder adhesion and accumulation. The beam duct 35 is installed inside the opening on the right side of the inner cavity of the conveying cylinder 34. The outlet of the beam duct 35 is conical. The beam duct 35 accelerates the airflow from the axial flow fan 33 and uses the Venturi effect to generate negative pressure at the outlet, drawing the sodium hydroxide particles from the conveying cylinder 34 into the air. The airflow is dispersed to form a uniform gas-solid two-phase flow. A connecting hood 36 is installed on the left side of the outlet of the axial flow fan 33. The outlet of the connecting hood 36 is connected to the inlet of the beam duct 35. The connecting hood 36 has a tapered flared shape, connecting the axial flow fan 33 and the beam duct 35, reducing airflow resistance loss, and simultaneously rectifying the airflow to ensure uniform and stable airflow entering the beam duct 35. A centrifugal fan 37 is installed on the front exterior of the housing 31. The centrifugal fan 37 is electrically connected to the controller 5. The centrifugal fan 37 generates high-pressure airflow that enters the conveying cylinder 34 through the connecting duct 38, blowing up and loosening the sodium hydroxide particles on the filter plate 39 to prevent clumping and bridging, preparing for subsequent conveying by the axial flow fan 33. The connecting duct 38 is installed on the conveying cylinder. The bottom of body 34 is located below the top feed inlet of conveying cylinder 34. The top end of connecting air duct 38 communicates with the inner cavity of conveying cylinder 34. The front side of connecting air duct 38 extends out of the outer shell 31 of the box and connects to the air outlet of centrifugal fan 37. Filter plate 39 is installed on the inner side of the top end of connecting air duct 38. Filter plate 39 supports sodium hydroxide particles, allows airflow from centrifugal fan 37 to pass through, and prevents large particles that have not been blown away from entering the airflow system. Filter plate 39 is removable for cleaning. Feeding channel 310 is installed on the left side of outer shell 31 of the box. The left end of feeding channel 310 extends to the top of reaction tank 21, and the right end of feeding channel 310 extends into the inner cavity of outer shell 31 of the box and communicates with the left side of the inner cavity of conveying cylinder 34.Solenoid valve 320 is installed above the inner cavity of the top feed inlet of conveying cylinder 34. The top feed inlet of solenoid valve 320 is connected to the bottom discharge outlet of solid conveying device 32. Solenoid valve 320 is electrically connected to controller 5. Solenoid valve 320 controls the opening and closing of the material channel between solid conveying device 32 and conveying cylinder 34. Controller 5 precisely controls the opening time according to the required feeding amount. The feeding channel 310 has discharge units spaced from left to right. Each discharge unit includes: a limiting telescopic rod 311, a first electric telescopic rod 312, a U-shaped frame 313, a second electric telescopic rod 314, a rotating seat 315, a gear set 316, a miniature electric telescopic rod 317, a feeding trough 318, and a sealing plate 319. The number of limiting telescopic rods 311 is... There are two limiting telescopic rods 311, which are respectively embedded inside the openings on the front and rear sides of the top of the feeding channel 310. The first electric telescopic rod 312 is installed at the top of the feeding channel 310 and is located inside the front and rear limiting telescopic rods 311. The telescopic end of the first electric telescopic rod 312 extends into the inner cavity of the feeding channel 310. The first electric telescopic rod 312 is electrically connected to the controller 5. The first electric telescopic rod 312 drives the U-shaped frame 313 to move up and down by its own extension and retraction, so as to realize the separation and contact between the sealing plate 319 and the feeding trough 318. It is equipped with a position sensor, which can provide real-time feedback of the telescopic position to the controller 5. The U-shaped frame 313 is installed at the bottom of the telescopic end of the first electric telescopic rod 312. The front and rear sides of the top of the U-shaped frame 313 are respectively connected to the front and rear... The bottom ends of the two limiting telescopic rods 311 are connected together; there are two second electric telescopic rods 314, one end of which is rotatably connected to the front and rear top ends of the U-shaped frame 313 via a rotating shaft. The second electric telescopic rods 314 are electrically connected to the controller 5. The second electric telescopic rods 314 drive the gear set 316 to rotate through the telescopic movement, thereby controlling the rotation angle of the rotating seat 315 and realizing the tilt angle adjustment of the sealing plate 319; there are two rotating seats 315, which are rotatably connected to the front and rear ends of the inner side of the U-shaped frame 313 via a rotating shaft. The axis of the rotating seat 315 extends out of the U-shaped frame 313; there are two gear sets 316, with gear keys below the two gear sets 316. The upper gears of the two gear sets 316 are rotatably connected to the front and rear top ends of the U-shaped frame 313 via a rotating shaft, and the telescopic ends of the two second electric telescopic rods 314 are rotatably connected to the outer sides of the upper gears of the front and rear gear sets 316 via a rotating shaft; there are two miniature electric telescopic rods 317, which are installed on the inner sides of the front and rear rotating seats 315 respectively. The miniature electric telescopic rods 317 are electrically connected to the controller 5. The miniature electric telescopic rods 317 drive the sealing plate 319 to move horizontally by extending and shortening themselves, thereby adjusting the size of the discharge port and controlling the amount of sodium hydroxide granules added; the feeding trough 318 is opened at the bottom of the inner cavity of the feeding channel 310 and is located below the U-shaped frame 313;A sealing plate 319 is disposed inside the feeding trough 318, and the top front and rear sides of the feeding trough 318 are respectively connected to the bottom of the telescopic ends of two miniature electric telescopic rods 317.

[0048] As a preferred option, further, such as Figure 6As shown, the pretreatment mechanism 4 includes: a water tank shell 41, a partition 42, a connecting pipe 43, a feeding device 44, a second stirring device 45, a first pump body 46, a second pump body 47, a storage tank 48, a third pump body 49, and a buoyancy net cylinder 410; the water tank shell 41 is installed on the top left side of the base platform 1 along the front-to-back direction, and a water tank level gauge and a pH sensor are installed inside the water tank shell 41 as needed; the partition 42 is set in the inner cavity of the water tank shell 41, dividing the inner cavity of the water tank shell 41 into front and rear parts, so that the front part of the water tank shell 41 focuses on oil removal to avoid the oil film affecting the mass transfer of the Fenton reaction, and the rear part focuses on pH adjustment to precisely control the acidic environment and realize the optimized process of first removing impurities and then adjusting parameters; the connecting pipe 43 is installed in the water tank shell 41. The connecting pipe 43 is located on the front left side of the outer shell 41 and connects to the top left front of the inner cavity of the front part of the outer shell 41. The connecting pipe 43 is connected to external equipment and equipped with a PVC ball valve to introduce the biologically treated coking wastewater into the front cavity of the outer shell 41. The water level is controlled by adjusting the inlet flow rate through the ball valve to prevent the tank from overflowing or running out of water. The feeding device 44 is installed at the top left rear of the outer shell 41. The outlet of the feeding device 44 is connected to the feeding port at the top rear of the inner cavity of the outer shell 41. The feeding device 44 is electrically connected to the controller 5. The feeding device 44 is a combination of a storage tank and a metering pump. The storage tank is made of FRP material and has a sealed cover to prevent sulfuric acid from volatilizing and generating acid mist. It has a built-in corrosion-resistant level gauge. The metering pump is a plunger-type metering pump resistant to concentrated sulfuric acid corrosion. The pump, a metering pump, automatically adjusts the dosage based on pH feedback; the second stirring device 45 is installed at the top of the water tank shell 41, and the stirring paddle of the second stirring device 45 extends into the rear part of the inner cavity of the water tank shell 41. The second stirring device 45 is electrically connected to the controller 5. The second stirring device 45 is a vertical stirrer with an anchor-type stirring paddle that fits against the bottom of the rear cavity of the water tank, driving the flow of wastewater throughout the cavity. This adapts to the flat structure of the rear part of the water tank, preventing local accumulation of sulfuric acid that could lead to uneven pH; the first pump body 46 is installed on the rear side of the water tank shell 41 via a bracket. The inlet of the first pump body 46 is connected to the outlet of the rear part of the inner cavity of the water tank shell 41, and the outlet pipe of the first pump body 46 is connected to the inlet of the reaction tank 21. The first pump body 46 is electrically connected to the controller 5. The first pump body 46 is a corrosion-resistant centrifugal pump with a built-in frequency converter. It transports the wastewater after oil removal and pH adjustment in the rear part of the water tank shell 41 to the reaction tank 21. The frequency converter automatically adjusts the pump speed according to the liquid level in the reaction tank 21 to avoid overflow or emptying of the reaction tank 21. The second pump body 47 is installed at the top of the water tank shell 41. The inlet pipe of the second pump body 47 extends into the front part of the inner cavity of the water tank shell 41, and the outlet pipe of the second pump body 47 extends into the rear part of the inner cavity of the water tank shell 41. The second pump body 47 is electrically connected to the controller 5. The second pump body 47 is a corrosion-resistant centrifugal pump with a low head setting. It pumps the wastewater after oil removal in the front part of the water tank shell 41 to the rear part and avoids excessive water flow impact and foaming caused by high head.The storage tank 48 is installed at the top right front of the water tank shell 41. The storage tank 48 is equipped with a manual drain valve and stores the oil film sucked in by the third pump body 49, preventing the oil film from flowing back into the wastewater system. When the oil residue in the storage tank accumulates to a threshold, it is discharged through the manual drain valve and transported to a professional institution for treatment to prevent the oil residue from deteriorating. The third pump body 49 is installed at the top of the water tank shell 41 and located to the right of the storage tank 48. The inlet pipe of the third pump body 49 extends into the front part of the inner cavity of the water tank shell 41, and the outlet pipe of the third pump body 49 is connected to the inlet of the storage tank 48. The third pump body 49 is electrically connected to the controller 5 and is self-priming. The centrifugal pump is equipped with an anti-clogging filter to prevent large impurities from entering the pump body. It utilizes a self-priming function to generate negative pressure, adsorbing the oil film on the surface of the water tank's front chamber through a buoyancy mesh cylinder 410, and then transporting it to the storage tank 48. Two buoyancy mesh cylinders 410 are used, installed on the front and rear sides of the inlet pipe of the third pump body 49, respectively. Each buoyancy mesh cylinder 410 has an outer layer of oleophilic-hydrophobic membrane, allowing it to float on the wastewater surface. The oleophilic-hydrophobic membrane only adsorbs oil and not water, ensuring high purity of the pumped oil film. The buoyancy mesh cylinder 410 is detachable, allowing for periodic removal and high-pressure water rinsing to remove surface impurities and restore adsorption efficiency.

[0049] Its detailed connection methods are well-known technologies in this field. The following mainly introduces the working principle and process, and the specific work is as follows:

[0050] Step 1: The coking wastewater after biological treatment flows automatically into the front area of ​​the inner cavity of the water tank shell 41 of the pretreatment mechanism 4 along the connecting pipe 43. The operator controls the controller 5 to start the third pump 49, the second stirring device 45, the feeding device 44, the second stirring device 45 and the first pump 46. The third pump 49 generates negative pressure, which sucks the oil film in the wastewater in the front area through the buoyancy net cylinder 410 and finally transports it to the storage tank 48 for separate storage and unified treatment of oil residue, thereby preventing the oil film from covering the wastewater surface and hindering the subsequent reagent mixing and mass transfer. The second pump 47 pumps the wastewater after oil removal in the front area to the rear area of ​​the water tank shell 41. The second stirring device 45 continuously stirs to fully mix the sulfuric acid and wastewater and adjust the pH of the wastewater in the rear area to 2-4. The first pump 46 pumps the qualified wastewater after oil removal and pH adjustment to the reaction tank 21 of the reaction mechanism 2, waiting to enter the catalytic oxidation stage.

[0051] Step 2: The operator starts the liquid delivery machine 23, reaction tank 21, and first stirring device 26 via controller 5, activating the relevant equipment in sequence. The temperature control device built into the reaction tank 21 is activated, adjusting the wastewater temperature to 20-40℃. This temperature range balances the reaction rate and hydrogen peroxide utilization. The liquid delivery machine 23 pre-stores ferrous sulfate solution and delivers it to several spaced spray pipes 24 at a preset flow rate. The spray pipes 24, through multiple nozzles, evenly spray the ferrous sulfate solution onto the wastewater surface, avoiding single-point addition that could lead to problems. When the local ferrous ion concentration is too high, the first stirring device 26 stirs the liquid inside the reaction tank 21 to make it fully mixed. After the ferrous sulfate solution and wastewater are initially mixed, the liquid delivery machine 23 switches to the hydrogen peroxide delivery mode and delivers the pre-stored hydrogen peroxide quantitatively to the spray pipe 24. Similarly, it is sprayed evenly through multiple sets of nozzles. The first stirring device 26 continues to stir. The hydroxyl radicals generated by the rapid reaction of hydrogen peroxide and ferrous ions under acidic conditions can efficiently degrade polycyclic aromatic hydrocarbons, heterocyclic compounds and other difficult-to-degrade organic matter in coking wastewater, and reduce COD and toxicity.

[0052] Step 3: After the reaction is complete, the operator activates the solid conveying device 32, solenoid valve 320, centrifugal fan 37, axial fan 33, feeding channel 310, second electric telescopic rod 314, and miniature electric telescopic rod 317 via controller 5. Dry sodium hydroxide powder stored in the solid conveying device 32 is conveyed to the solenoid valve 320 according to a preset dosage. The solenoid valve 320 opens, and the powder falls into the conveying cylinder 34 and onto the filter plate 39 at the bottom. The solenoid valve 320 closes, and the centrifugal fan 37 generates... High-pressure airflow enters the conveying cylinder 34 through the connecting duct 38, blowing the sodium hydroxide powder on the filter plate 39 upwards to loosen the powder and prevent clumping. After 10-15 seconds, the centrifugal fan 37 is turned off, and the axial flow fan 33 starts simultaneously. The resulting high-pressure airflow enters the beam pipe 35 through the connecting cover 36, forming a high-speed airflow. The high-speed airflow generates negative pressure inside the conveying cylinder 34, drawing in the loosened sodium hydroxide powder and dispersing it in the airflow, forming a gas-solid two-phase flow. Subsequently, the two-phase flow enters the feeding channel 310. The discharge unit in 10 is activated sequentially from right to left. The first electric telescopic rod 312 shortens, causing the U-shaped frame 313 to move upward under the constraint of the limiting telescopic rod 311, thereby pulling the lower sealing plate 319 away from the feeding trough 318 and releasing the sealing state of the feeding trough 318. The second electric telescopic rods 314 on the front and rear sides shorten, driving the upper gear of the corresponding gear set 316 to rotate, driving the lower gear and the rotating seat 315 to rotate, so that the miniature electric telescopic rod 317 connected to the rotating seat 315 and the sealing plate 319 are activated. The sealing plate 319 rotates to an inclined state, the micro electric telescopic rod 317 shortens, and pulls the sealing plate 319 to move to the left on the feeding trough 318, leaving a discharge gap; the gas-solid two-phase flow impacts the inclined sealing plate 319, slides into the feeding trough 318 along the inclined surface, and finally falls evenly into the reaction tank 21. The first stirring device 26 continues to stir to fully mix sodium hydroxide with wastewater and adjust the pH to 8-9: at this time, ferrous ions are completely converted into ferric hydroxide flocculent precipitate, while neutralizing the acidic substances in the wastewater;

[0053] Step 4: After the catalytic oxidation stage, the mixed liquid in reaction tank 21 is discharged into sedimentation tank 6 through the bottom outlet pipe for preliminary settling. The staff starts the filter press 7 and storage device 8 through the controller 5. The filter press 7 extracts the supernatant after preliminary settling and filters it through the internal filter cloth to remove sludge, separating the fine iron hydroxide particles remaining in the supernatant to ensure that the effluent is clear. The separated sludge is discharged through the sludge discharge port of the filter press 7, collected and transported to a professional hazardous waste treatment facility for disposal. The separated purified water is transported to the storage device 8 through the outlet pipe of the filter press for temporary storage. The storage device 8 will monitor the water quality in real time and will then be transported to the next treatment unit according to the reuse requirements.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A catalytic oxidation device for coking wastewater reuse, characterized in that, include: Base platform (1); The reaction mechanism (2) is located on the rear side of the top of the base platform (1); The pretreatment mechanism (4) is located on the top left side of the base platform (1); The controller (5) is installed at the top of the base platform (1) and located to the right of the reaction mechanism (2); The sedimentation tank (6) is located at the top of the base platform (1) and to the right front of the reaction mechanism (2); A filter press (7) is set at the top of the base platform (1) and located on the right side of the sedimentation tank (6). The inlet pipe of the filter press (7) extends into the inner cavity of the sedimentation tank (6). The filter press (7) and the controller (5) are electrically connected. The storage device (8) is located at the top of the base platform (1) and in front of the right side of the reaction mechanism (2). The outlet pipe of the filter press (7) is connected to the inlet of the storage device (8). The storage device (8) is electrically connected to the controller (5). The reaction mechanism (2) includes: The reaction tank (21) is installed on the rear side of the top of the base platform (1) in the left-right direction. The liquid outlet pipe of the reaction tank (21) extends into the inner cavity of the sedimentation tank (6). The reaction tank (21) and the controller (5) are electrically connected. The high-level platform (22) is installed at the top of the base platform (1) and located to the right of the reaction tank (21); A liquid delivery machine (23) is installed on the front side of the top of the high-rise platform (22), and the liquid delivery machine (23) is electrically connected to the controller (5); Solid delivery component (3) is located at the rear top of the high-rise platform (22); Spray pipe (24), the number of spray pipes (24) is several, and several spray pipes (24) are installed at intervals from left to right at the top of the inner cavity of the reaction tank (21). The spray pipes (24) and the discharge port of the liquid delivery machine (23) are connected by pipes. A truss (25), the number of which is several, and several of the trusses (25) are installed at intervals along the front-back direction at the top of the reaction tank (21); The first stirring device (26) is a plurality of the first stirring devices (26), and the plurality of the first stirring devices (26) are fixedly installed inside the plurality of trusses (25). The stirring paddle in the first stirring device (26) extends into the inner cavity of the reaction tank (21). The first stirring device (26) and the controller (5) are electrically connected. The pretreatment mechanism (4) includes: The water tank shell (41) is installed on the top left side of the base platform (1) in the front-rear direction; A partition (42) is provided in the inner cavity of the water tank shell (41), and the partition (42) divides the inner cavity of the water tank shell (41) into front and rear parts; A connecting pipe (43) is installed on the outer left front end of the water tank shell (41), and the connecting pipe (43) is connected to the top left front of the inner cavity of the front part of the water tank shell (41); Feeding device (44) is installed at the top left rear of the water tank shell (41). The outlet of the feeding device (44) is connected to the feeding port at the top of the rear part of the inner cavity of the water tank shell (41). The feeding device (44) and the controller (5) are electrically connected. The second stirring device (45) is installed at the top of the water tank shell (41). The stirring paddle of the second stirring device (45) extends into the rear part of the inner cavity of the water tank shell (41). The second stirring device (45) and the controller (5) are electrically connected. The first pump body (46) is mounted on the rear side of the outer shell (41) of the water tank by a bracket. The inlet of the first pump body (46) is connected to the outlet of the rear part of the inner cavity of the water tank shell (41). The outlet pipe of the first pump body (46) is connected to the inlet of the reaction tank (21). The first pump body (46) and the controller (5) are electrically connected. The second pump body (47) is installed at the top of the water tank shell (41). The inlet pipe of the second pump body (47) extends into the front part of the inner cavity of the water tank shell (41), and the outlet pipe of the second pump body (47) extends into the rear part of the inner cavity of the water tank shell (41). The second pump body (47) and the controller (5) are electrically connected. The liquid storage tank (48) is installed at the top right front of the outer shell of the water tank (41); The third pump body (49) is installed at the top of the water tank shell (41) and located on the right side of the storage tank (48). The inlet pipe of the third pump body (49) extends into the front part of the inner cavity of the water tank shell (41). The outlet pipe of the third pump body (49) is connected to the inlet of the storage tank (48). The third pump body (49) and the controller (5) are electrically connected. Two buoyancy net cylinders (410) are installed on the front and rear sides of the inlet pipe of the third pump body (49), respectively.

2. The catalytic oxidation equipment in a coking wastewater reuse process according to claim 1, characterized in that, The solid delivery component (3) includes: The outer casing (31) is installed on the rear top of the high-rise platform (22) in the left-right direction; A solid conveying device (32) is installed on the top of the outer shell (31) of the box, and the solid conveying device (32) is electrically connected to the controller (5); An axial flow fan (33) is installed inside the right opening of the housing (31), and the axial flow fan (33) is electrically connected to the controller (5); The conveying cylinder (34) is installed on the left side of the bottom of the inner cavity of the outer shell (31) of the box along the left and right direction via a bracket; The beam pipe (35) is installed inside the opening on the right side of the inner cavity of the conveying cylinder (34); A connecting cover (36) is installed on the left side of the air outlet of the axial flow fan (33), and the outlet of the connecting cover (36) is connected to the inlet of the beam pipe (35); A centrifugal fan (37) is installed on the front side of the outer casing (31) of the housing, and the centrifugal fan (37) is electrically connected to the controller (5).

3. The catalytic oxidation equipment in a coking wastewater reuse process according to claim 2, characterized in that, The solid delivery component (3) also includes: A connecting air duct (38) is installed at the bottom of the conveying cylinder (34) and located below the top feed inlet of the conveying cylinder (34). The top end of the connecting air duct (38) communicates with the inner cavity of the conveying cylinder (34). The front side of the connecting air duct (38) extends out of the outer shell (31) of the box and connects to the air outlet of the centrifugal fan (37). A filter screen (39) is installed on the inner side of the top of the connecting air duct (38); Feeding channel (310) is installed on the left side of the outer shell (31) of the box. The left end of the feeding channel (310) extends to the top of the reaction tank (21), and the right end of the feeding channel (310) extends into the inner cavity of the outer shell (31) and is connected to the left side of the inner cavity of the conveying cylinder (34). The solenoid valve (320) is installed above the inner cavity of the top feed inlet of the conveying cylinder (34). The top feed inlet of the solenoid valve (320) is connected to the bottom discharge port of the solid conveying device (32). The solenoid valve (320) and the controller (5) are electrically connected. The feeding channel (310) is provided with discharge units spaced from left to right inside.

4. The catalytic oxidation equipment in a coking wastewater reuse process according to claim 3, characterized in that, The outlet of the beam pipe (35) is conical.

5. The catalytic oxidation equipment in a coking wastewater reuse process according to claim 4, characterized in that, The discharge unit includes: Limiting telescopic rods (311), the number of the limiting telescopic rods (311) is two, and the two limiting telescopic rods (311) are respectively embedded in the openings on the front and rear sides of the top of the feeding channel (310); The first electric telescopic rod (312) is installed at the top of the feeding channel (310) and located inside the front and rear limiting telescopic rods (311). The telescopic end of the first electric telescopic rod (312) extends into the inner cavity of the feeding channel (310). The first electric telescopic rod (312) is electrically connected to the controller (5). The U-shaped frame (313) is installed at the bottom of the telescopic end of the first electric telescopic rod (312), and the top front and rear sides of the U-shaped frame (313) are respectively connected to the bottom of the telescopic ends of the front and rear limit telescopic rods (311). The second electric telescopic rod (314) has two parts. One end of each of the two electric telescopic rods (314) is rotatably connected to the top of the front and rear sides of the U-shaped frame (313) through a rotating shaft. The second electric telescopic rod (314) is electrically connected to the controller (5). Rotary seat (315), there are two rotating seats (315), and the two rotating seats (315) are respectively rotatably connected to the front and rear ends of the inner side of the U-shaped frame (313) through a rotating shaft. The axis of the rotating seat (315) extends out of the U-shaped frame (313). The gear set (316) consists of two gear sets (316). The gear keys of the two gear sets (316) are connected to the outer end of the shaft of the rotating seat (315). The upper gears of the two gear sets (316) are rotatably connected to the top of the front and rear sides of the U-shaped frame (313) through a rotating shaft. The telescopic ends of the two second electric telescopic rods (314) are respectively rotatably connected to the outer side of the upper gears of the front and rear gear sets (316) through a rotating shaft. The miniature electric telescopic rod (317) has two components. The two miniature electric telescopic rods (317) are respectively installed on the inner side of the front and rear rotating seats (315). The miniature electric telescopic rod (317) is electrically connected to the controller (5). The feeding trough (318) is located at the bottom of the inner cavity of the feeding channel (310) and below the U-shaped frame (313); A sealing plate (319) is provided on the inner side of the feeding trough (318), and the top front and rear sides of the feeding trough (318) are respectively connected to the bottom of the telescopic ends of two miniature electric telescopic rods (317).

6. A catalytic oxidation method for coking wastewater reuse, applied in a catalytic oxidation device for coking wastewater reuse as described in claim 5, characterized in that, The steps are as follows: S1. Preprocessing: After biological treatment, the coking wastewater flows through the connecting pipe (43) into the front area of ​​the water tank shell (41) of the pretreatment unit (4), and the relevant equipment is started by the controller (5): Oil removal: The third pump body (49) generates negative pressure and uses the buoyancy net cylinder (410) to adsorb the oil film on the surface of the wastewater and transport it to the storage tank (48) for separate storage to avoid the oil film from hindering the subsequent reagent mixing and mass transfer; pH adjustment: The second pump (47) pumps the degreased wastewater to the area behind the tank shell (41), the feeding device (44) adds sulfuric acid solution according to the preset dosage, and the second stirring device (45) continuously stirs to fully mix the solution with the wastewater and adjust the pH to 2-4. Wastewater transport: The first pump (46) pumps the treated wastewater to the reaction tank (21) of the reaction mechanism (2) for catalytic oxidation. S2, catalytic oxidation: The reaction-related equipment is started by the controller (5), and the catalytic oxidation is completed in three steps: Fenton reaction preparation: The temperature control equipment of the reaction tank (21) is started to adjust the wastewater temperature to 20-40℃; the liquid delivery machine (23) delivers the ferrous sulfate solution to several spray pipes (24) according to the preset flow rate, and sprays it evenly on the surface of the wastewater through the nozzles; the first stirring device (26) stirs to make the solution and wastewater initially mixed. Fenton reaction start-up: The liquid delivery machine (23) switches to hydrogen peroxide delivery mode and delivers hydrogen peroxide quantitatively to the spray pipe (24) for uniform spraying. The first stirring device (26) continuously stirs, which promotes the reaction of hydrogen peroxide and ferrous ions to generate hydroxyl radicals, degrades recalcitrant organic matter and reduces COD and toxicity. Neutralization and iron removal: The solid conveying device (32) conveys sodium hydroxide powder to the solenoid valve (320) according to the preset dosage. The powder falls onto the filter plate (39) of the conveying cylinder (34). The centrifugal fan (37) starts for 10-15 seconds to loosen the powder and then shuts off. The axial flow fan (33) starts to form a high-speed airflow, which adsorbs and disperses the powder into a gas-solid two-phase flow and sends it into the feeding channel (310). The discharge unit in the feeding channel (310) starts from right to left. Through the cooperation of the first electric telescopic rod (312), the second electric telescopic rod (314) and the gear set (316), the sealing plate (319) is tilted and a discharge gap is reserved, so that the gas-solid two-phase flow falls evenly into the reaction tank (21). The first stirring device (26) continues to stir, so that the sodium hydroxide and wastewater are mixed and the pH is adjusted to 8-9, so that the ferrous ions are converted into ferric hydroxide flocculent precipitate. S3. Solid-liquid separation and purified water storage: Preliminary sedimentation: The mixed liquid in the reaction tank (21) is discharged into the sedimentation tank (6) through the outlet pipe and allowed to settle for 30-60 minutes; Deep separation: The controller (5) starts the filter press (7), extracts the supernatant from the sedimentation tank (6), and desludges it through the filter cloth to separate the residual fine particles. The sludge is discharged through the sludge discharge port and sent to a professional hazardous waste treatment institution. Storage and reuse: The purified water is transported to the storage device (8) through the filter press (7) for temporary storage. The device monitors the water quality in real time and then transports it to the next treatment unit as needed.

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