Air flotation oil removal device for coal chemical industry wastewater treatment

Abstract

The invention discloses an air flotation oil removal device for coal chemical industry wastewater treatment, and relates to the field of wastewater treatment. An air flotation oil removal device for coal chemical industry wastewater treatment comprises a treatment tank, one side of the treatment tank is fixedly communicated with a water inlet pipe, and the bottom of the treatment tank is fixedly communicated with a drain valve pipe; the problems that grease in the coal chemical industry wastewater is attached to the surface of equipment to form an oil film and is combined with other pollutants to form refractory organic matters are solved, the dynamically adjusted floating oil collecting system adapts to liquid level fluctuation, efficient oil-water separation is kept, microbubbles promote grease to float and gather, attachment of the grease to the surface of the equipment is reduced, and the service life of the equipment is prolonged. The oil discharge assembly timely discharges the separated grease to prevent the grease from being mixed with the wastewater again, so that the risk of forming an oil film on the surface of the equipment is reduced, the opportunity that the grease is combined with other pollutants to form refractory organic matters is reduced, the efficiency and quality of coal chemical wastewater treatment are improved, the service life of the equipment is prolonged, and the cost is reduced. And the subsequent treatment difficulty and cost are reduced.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and more specifically, relates to an air flotation oil removal device for coal chemical wastewater treatment. Background Technology

[0002] Coal chemical wastewater refers to industrial wastewater generated during coal chemical production. Coal chemical processing involves converting coal into gaseous, liquid, and solid products and chemicals, which produces a large amount of wastewater. The main sources of coal chemical wastewater include wastewater generated during coal gasification, direct coal liquefaction, and coking processes. Specifically, this includes gasification wastewater, purification wastewater, domestic and laboratory wastewater, circulating sewage, drainage from chemical water treatment plants, initial rainwater, and concentrated brine generated during wastewater treatment and reuse.

[0003] Coal chemical wastewater contains a large amount of grease, which mainly comes from organic matter such as aliphatic hydrocarbons and cycloalkanes in raw coal. The presence of grease greatly affects the treatment of coal chemical wastewater. First, grease will adhere to the surface of wastewater treatment equipment, forming an oil film, which affects the normal operation of the equipment and the treatment effect. Second, grease will also combine with other pollutants in the wastewater to form more difficult-to-degrade organic matter, increasing the difficulty and cost of wastewater treatment and making it difficult to meet the high standards of wastewater treatment required by modern chemical production. In view of this, the present invention is proposed. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an air flotation oil removal device for coal chemical wastewater treatment that can overcome or at least partially solve the above problems.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: an air flotation oil removal device for coal chemical wastewater treatment, comprising a treatment tank, an inlet pipe fixedly connected to one side of the treatment tank, a drain valve pipe fixedly connected to the bottom of the treatment tank, a check valve fixedly installed at the inlet of the inlet pipe, and further comprising: a sliding rod, fixedly connected in a circumferentially equidistant manner inside the treatment tank; float sleeves, slidably connected to the sliding rod; screen plates, fixedly connected between every two adjacent float sleeves; an oil skimming hopper, disposed between multiple float sleeves and fixedly connected to multiple screen plates by a connecting rod; an oil discharge assembly for skimming oil from the oil skimming hopper and discharging it out of the treatment tank, installed at the bottom opening of the oil skimming hopper; an air jet assembly for causing oil in the wastewater to float to the surface to form scum, installed inside the treatment tank and located below the sliding rod; and an air supply assembly for supplying air to the air jet assembly, disposed on one side of the treatment tank.

[0006] Furthermore, the oil draining assembly includes an oil drain pipe, the oil inlet of which is fixedly connected to the bottom opening of the skimming hopper, and the oil draining end of which extends out of the treatment tank.

[0007] To facilitate the detection of oil content in the wastewater inside the skimming hopper, a water oil monitor is further included. The water oil monitor is fixedly installed on the outer wall of the treatment tank, and the test terminals of the water oil monitor are installed inside the skimming hopper.

[0008] Furthermore, the jet assembly includes an annular diverter pipe, a connecting pipe, and an anti-clogging nozzle. The annular diverter pipe is fixedly connected inside the treatment tank and located between the inlet pipe and the drain valve pipe. The connecting pipe is fixedly connected to the annular diverter pipe at equal intervals, and the anti-clogging nozzle is fixedly connected to the connecting pipe at equal intervals.

[0009] Furthermore, the air supply assembly includes an air compressor, a bracket is provided on one side of the treatment tank, the air compressor is fixedly mounted on the bracket, and the exhaust end of the air compressor and the air inlet end of the annular splitter pipe are connected to each other through an air delivery pipe.

[0010] To further improve the efficiency of removing floating oil sludge, a drive shaft is rotatably connected to the upper part of the inside of the treatment tank. Multiple L-shaped square rods are fixedly connected to the lower end of the drive shaft at equal intervals around the circumference. Floating scrapers are slidably connected to the L-shaped square rods. The floating scrapers are inclined and located in the area between the float sleeve and the inner wall of the treatment tank, and are used to push the floating oil sludge on the outer ring of the water surface toward the position of the skimming hopper.

[0011] To facilitate the purification of exhaust gas, an annular shell is fixedly installed at the top of the treatment tank. The drive shaft extends upward through one end of the treatment tank into the annular shell. Multiple blades are fixedly connected circumferentially at equal intervals on the part of the drive shaft located inside the annular shell. An exhaust pipe and an exhaust pipe are fixedly connected to the annular shell. A purification box is fixedly installed at the upper end of the treatment tank. An activated carbon adsorption plate is installed inside the purification box. The outlet of the exhaust pipe is fixedly connected to the inlet of the purification box.

[0012] To further reduce operating costs, the air outlet of the purification box is fixedly connected to the air inlet of the air compressor via a connecting pipe.

[0013] To further reduce impurities in the wastewater, a treatment box is fixedly installed on the side of the treatment tank near the inlet pipe. A filter plate is fixedly installed inside the treatment box. Inlet and outlet ports are respectively opened at the upper and lower ends of the treatment box. The inlet port of the treatment box is connected to the inlet port of the inlet pipe. The check valve is located between the inlet port of the treatment box and the inlet port of the inlet pipe.

[0014] To facilitate the cleaning of impurities on the filter plate, a telescopic cylinder is fixedly installed on one side of the treatment box. The telescopic end of the cylinder extends into the treatment box and is fixedly connected to a brush. The lower surface of the brush slides against the upper surface of the filter plate. A waste discharge port is provided on the side of the treatment box away from the telescopic cylinder, and a waste collection box for collecting waste residue is installed on the side of the treatment box near the waste discharge port.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention effectively solves the problem of grease adhering to the surface of equipment and forming an oil film in coal chemical wastewater, and combining with other pollutants to form recalcitrant organic matter. The dynamically adjusted floating oil collection system adapts to liquid level fluctuations, maintains continuous and efficient oil-water separation, and microbubbles promote the floating and aggregation of grease, reducing the adhesion of grease to the equipment surface. The oil discharge component promptly discharges the separated grease, preventing it from remixing with the wastewater. This synergistic effect significantly reduces the risk of oil film formation on the equipment surface and reduces the opportunity for grease to combine with other pollutants to form recalcitrant organic matter. Therefore, the present invention improves the efficiency and quality of coal chemical wastewater treatment, extends the service life of equipment, and reduces the difficulty and cost of subsequent treatment.

[0016] The wastewater is filtered by the filter plates inside the treatment box. The telescopic cylinder pushes the brush to the right, and the brush pushes the filtered impurities accumulated on the upper surface of the filter plate. The impurities are discharged into the waste collection box through the waste outlet for centralized collection, thus preventing the impurities from clogging the filter plate.

[0017] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure from another perspective of the present invention; Figure 3 This is a schematic diagram of the internal structure of the processing tank of the present invention; Figure 4 This is a partial structural diagram of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the internal structure of the processing box and waste collection box of the present invention; Figure 6 This is a partial structural diagram of the present invention. Figure 2 ; Figure 7 This is a schematic diagram of the internal structure of the annular shell of the present invention; Figure 8 This is a schematic diagram of the internal structure of the purification box of the present invention.

[0019] In the diagram: 1. Treatment tank; 101. Inlet pipe; 102. Drain valve pipe; 103. Check valve; 104. Annular diverter pipe; 105. Connecting pipe; 106. Anti-clogging nozzle; 107. Support; 108. Air compressor; 109. Air supply pipe; 1010. Connecting air pipe; 2. Treatment box; 201. Filter plate; 202. Brush; 203. Telescopic cylinder; 204. Waste outlet; 205. Waste collection box; 3. Slide rod; 301. Float sleeve; 302. Mesh plate; 303. Oil skimmer; 304. Oil drain pipe; 305. Oil level monitor in water; 4. Purification box; 401. Activated carbon adsorption plate; 5. Annular shell; 501. Drive shaft; 502. L-shaped square rod; 503. Floating scraper; 504. Suction pipe; 505. Exhaust pipe; 5010. Blade. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] Example: Refer to Figures 1-8 An air flotation oil removal device for treating coal chemical wastewater includes a treatment tank 1. An inlet pipe 101 is fixedly connected to one side of the treatment tank 1, and a drain valve pipe 102 is fixedly connected to the bottom of the treatment tank 1. A check valve 103 is fixedly installed at the inlet of the inlet pipe 101. The device also includes: a sliding rod 3, circumferentially and equidistantly fixedly connected inside the treatment tank 1; float sleeves 301, slidably connected to the sliding rod 3; screen plates 302, fixedly connected between every two adjacent float sleeves 301; an oil skimming hopper 303, positioned between multiple float sleeves 301 and fixedly connected to multiple screen plates 302 via connecting rods; an oil discharge assembly for skimming oil from the oil skimming hopper 303 and discharging it from the treatment tank 1, installed at the bottom opening of the oil skimming hopper 303; an air jet assembly for causing grease in the wastewater to float to the surface and form scum, installed inside the treatment tank 1 and located below the sliding rod 3; and an air supply assembly for supplying air to the air jet assembly, located on one side of the treatment tank 1.

[0022] The oil drain assembly includes an oil drain pipe 304, the oil inlet end of which is fixedly connected to the bottom opening of the oil skimmer 303, and the oil drain end of the oil drain pipe 304 extends out of the treatment tank 1.

[0023] The jet assembly includes an annular diverter pipe 104, a connecting pipe 105, and an anti-clogging nozzle 106. The annular diverter pipe 104 is fixedly connected inside the treatment tank 1 and is located between the water inlet pipe 101 and the drain valve pipe 102. The connecting pipe 105 is fixedly connected to the annular diverter pipe 104 at equal intervals, and the anti-clogging nozzle 106 is fixedly connected to the connecting pipe 105 at equal intervals.

[0024] The air supply assembly includes an air compressor 108. A bracket 107 is provided on one side of the treatment tank 1. The air compressor 108 is fixedly installed on the bracket 107. The exhaust end of the air compressor 108 and the air inlet end of the annular split pipe 104 are connected to each other through an air delivery pipe 109.

[0025] The treatment tank 1 is a cylindrical stainless steel structure with an opening at the top for easy observation and maintenance (not shown in the figure). The inlet pipe 101 is fixedly connected to the side wall of the treatment tank 1. The drain valve pipe 102 is located at the bottom center. The check valve 103 is a spring-loaded check valve installed at the inlet of the inlet pipe 101. The slide bar 3 is a stainless steel round bar, which is evenly distributed and fixedly installed along the inner wall of the treatment tank 1. The float sleeve 301 is made of hollow polyethylene material and has through holes inside that match the slide bar 3, allowing it to slide freely along the slide bar 3. The mesh plate 302 is made of polypropylene material and is fixedly connected between adjacent float sleeves 301.

[0026] The oil skimming hopper 303 is funnel-shaped and made of oil-resistant rubber material. It is set between multiple floating sleeves 301. The oil skimming hopper 303 is fixedly connected to the surrounding mesh plate 302 by a stainless steel connecting rod to maintain a stable relative position. The oil discharge assembly includes an oil discharge pipe 304 connected to the bottom opening of the oil skimming hopper 303. The oil discharge pipe 304 extends to the outside of the treatment tank 1. The jet assembly consists of an annular diverter pipe 104, a connecting pipe 105, and an anti-clogging nozzle 106. The annular diverter pipe 104 is fixed to the inner wall of the treatment tank 1 and is located between the water inlet pipe 101 and the drain valve pipe 102. The connecting pipes 105 are evenly distributed on the annular diverter pipe 104. The anti-clogging nozzle 106 is installed on the connecting pipe 105. The air supply assembly includes an air compressor 108 fixed on the outer support 107 of the treatment tank 1 and connected to the annular diverter pipe 104 through an air supply pipe 109.

[0027] When using the air flotation oil removal device for coal chemical wastewater treatment, firstly, the coal chemical wastewater enters the treatment tank 1 through the inlet pipe 101. At this time, the air compressor 108 is started, and the air compressor 108 begins to extract gas. This gas is transported to the annular diversion pipe 104 through the gas delivery pipe 109. Then, the gas enters the connecting pipe 105 from the annular diversion pipe 104, and finally is discharged into the wastewater in the treatment tank 1 through the anti-clogging nozzle 106. In the wastewater, the gas forms a large number of tiny bubbles and surges upward. Tiny oil droplets in the wastewater adhere to the surface of these bubbles and float to the surface of the wastewater along with the bubbles, thus forming grease scum.

[0028] During the formation of scum, the buoyancy of the float sleeve 301 keeps the oil skimmer 303 at the surface of the wastewater in the treatment tank 1. The oil skimmer 303 can extract the grease from the surface of the wastewater. The extracted grease is discharged from the treatment tank 1 through the oil drain pipe 304. When most of the grease on the wastewater is separated from the wastewater, the valve on the drain valve pipe 102 can be opened, so that the coal chemical wastewater can be discharged into the next treatment process through the drain valve pipe 102. This completes the pretreatment of the coal chemical wastewater.

[0029] Through the above-mentioned solution, this application effectively solves the problem of grease adhering to the surface of equipment and forming an oil film, which combines with other pollutants to form recalcitrant organic matter in coal chemical wastewater. The dynamically adjustable floating oil collection system adapts to liquid level fluctuations, maintaining continuous and efficient oil-water separation. Microbubbles promote the floating and aggregation of grease, reducing grease adhesion to the equipment surface. The oil discharge component promptly discharges the separated grease, preventing it from re-mixing with the wastewater. This synergistic effect significantly reduces the risk of oil film formation on the equipment surface and reduces the opportunity for grease to combine with other pollutants to form recalcitrant organic matter. Therefore, this application improves the efficiency and quality of coal chemical wastewater treatment, extends the service life of equipment, and reduces the difficulty and cost of subsequent treatment.

[0030] As a preferred embodiment, it also includes an oil-water monitor 305, which is fixedly installed on the outer wall of the treatment tank 1, and the test terminals of the oil-water monitor 305 are installed inside the skimming hopper 303.

[0031] The oil-water monitor 305 can be connected by a flange or fixed by a snap-fit. The test terminal extends into the oil skimmer 303 through a sealed sleeve, with its end positioned 5-15 cm from the bottom of the oil skimmer 303. The test terminal can be a capacitive or optical sensor, such as an infrared spectral analysis module, with a detection accuracy of ±0.1 mm oil layer thickness. The oil-water monitor 305 and the control valve of the drain valve 102 are connected by a PLC controller. During the oil discharge process, the oil-water monitor 305 continuously monitors the changes in the oil layer. When the oil layer thickness drops to a preset threshold, the control system opens the drain valve 102 to discharge wastewater.

[0032] Through the above technical solution, this application realizes real-time monitoring of the oil layer status inside the skimming hopper 303. The external installation of the oil-in-water monitor 305 avoids equipment corrosion caused by direct contact with wastewater, and facilitates maintenance and operation. The test terminals are arranged inside the skimming hopper 303, which can directly detect the oil-water interface height and oil layer thickness, providing data support for the start and stop of the oil discharge component. This design solves the problem of lag in traditional oil discharge operation that relies on manual observation or timed oil discharge. By dynamically adjusting the oil discharge strategy through real-time monitoring data, the oil discharge process is ensured to be accurate and efficient, avoiding oil residue or ineffective discharge. The oil-in-water monitor 305 detects the oil content in the wastewater entering the skimming hopper 303. When the threshold is reached, the coal chemical wastewater can be discharged into the next treatment process through the drain valve pipe 102, improving the oil recovery efficiency and wastewater treatment effect.

[0033] In a preferred embodiment, a drive shaft 501 is rotatably connected to the upper end of the interior of the treatment tank 1. Multiple L-shaped square rods 502 are fixedly connected to the lower end of the drive shaft 501 at equal intervals around the circumference. A floating scraper 503 is slidably connected to the L-shaped square rods 502. The floating scraper 503 is inclined and located in the area between the float sleeve 301 and the inner wall of the treatment tank 1, and is used to push the floating oil sludge on the outer ring of the water surface toward the position of the skimming bucket 303.

[0034] The drive shaft 501 is rotatably connected to the upper part of the treatment tank 1 through a bearing structure. The number of L-shaped square rods 502 can be 3-6, and the length of their horizontal extension can cover 80%-95% of the area between the float sleeve 301 and the inner wall of the tank. The floating scraper 503 is made of polytetrafluoroethylene and has a buoyancy cavity at its bottom. The ratio of the volume of the buoyancy cavity to the weight of the scraper is 1.2:1 to 1.5:1, ensuring that the scraper can slide and adjust on the L-shaped square rod 502 with the water level fluctuation. The scraper tilt angle is set to 30°-60°, and its working surface faces the front side of the rotation direction.

[0035] Specifically, when the drive shaft 501 is driven to rotate by external power, it drives the L-shaped square rod 502 to make a circular motion, causing the slidingly connected floating scraper 503 to move along the inner wall area of ​​the treatment tank 1. Due to buoyancy, the floating scraper 503 automatically maintains contact with the water surface, and its inclined working surface continuously pushes the floating oil sludge dispersed in the annular area towards the central area. During the movement of the scraper, the contact pressure between its lower end and the water surface is controlled at 0.5-2 Newtons, ensuring both pushing effect and preventing it from sinking into the water. Each rotation of the scraper can move the floating oil sludge by 5... The oil sludge, ranging from 0 to 150 mm, is concentrated in the collection area of ​​the skimming hopper 303 after multiple accumulations. The surface roughness of the inner wall of the treatment tank 1 is controlled at Ra3.2-Ra6.3, which can reduce the adhesion resistance of the oil sludge. This mechanical propulsion method complements the jet disturbance. When the bubble rising speed is 0.2 m / s, the scraper linear speed is set to 0.15 m / s, forming relative motion to enhance the aggregation of oil sludge. The oil sludge collection efficiency can be increased from 60%-70% of the conventional scheme to 85%-92%, and the treatment cycle is shortened by 30%-40%.

[0036] Through the above technical solution, this application realizes the active collection of dispersed floating oil sludge. The rotation of the drive shaft 501 drives the L-shaped square rod 502 to make a circular motion, so that the floating scraper 503, which is slidably connected to the L-shaped square rod 502, sweeps along the inner wall area of ​​the treatment tank 1. The floating scraper 503 adopts a sliding connection structure and can automatically adjust its vertical position according to the water level change to ensure that it is always in contact with the water surface. The inclined scraper forms an inclined push-pull action during the rotation, continuously guiding the floating oil sludge attached to the inner wall to the skimming hopper 303 in the central area. This design solves the dispersion problem of floating oil sludge caused by bubble disturbance through the synergistic effect of mechanical scraping and fluid guidance, and enhances the oil sludge collection efficiency.

[0037] In a preferred embodiment, an annular housing 5 is fixedly installed at the top of the treatment tank 1. A drive shaft 501 extends upward through one end of the treatment tank 1 into the annular housing 5. Multiple blades 5010 are fixedly connected circumferentially at equal intervals on the part of the drive shaft 501 located inside the annular housing 5. An exhaust pipe 504 and an exhaust pipe 505 are fixedly connected to the annular housing 5. A purification box 4 is fixedly installed at the upper end of the treatment tank 1. An activated carbon adsorption plate 401 is installed inside the purification box 4. The outlet of the exhaust pipe 505 is fixedly connected to the inlet of the purification box 4.

[0038] The air outlet of the purification box 4 is fixedly connected to the air inlet of the air compressor 108 via a connecting pipe 1010.

[0039] Specifically, when the air compressor 108 is working, it generates a suction effect, drawing the exhaust gas from the treatment tank 1 into the annular housing 5 through the extraction pipe 504. The exhaust gas entering the annular housing 5 impacts the blades 5010. Since multiple blades 5010 are circumferentially and equidistantly connected to the drive shaft 501 located inside the annular housing 5, the impact of the exhaust gas drives the blades 5010 to rotate, thereby driving the drive shaft 501 to rotate. This eliminates the need for additional drive equipment to drive the drive shaft 501, effectively reducing wastewater treatment costs. Afterward, the exhaust gas enters the purification chamber 4 from the annular housing 5 through the exhaust pipe 505. When the exhaust gas enters the purification chamber 4, it comes into contact with the activated carbon adsorption plate 401 inside the purification chamber 4. The harmful substances in the exhaust gas are adsorbed and purified by the activated carbon adsorption plate 401. Finally, the purified gas enters the air intake port of the air compressor 108 from the outlet of the purification chamber 4 through the connecting pipe 1010, realizing the recycling of gas.

[0040] Through the above technical solution, this application achieves the directional collection and purification of harmful gases in the treatment tank 1. The annular shell 5 serves as the gas collection chamber. Gas containing oil mist and volatile substances in the treatment tank 1 enters the shell through the suction pipe 504. The exhaust pipe 505 guides the collected gas into the purification box 4. The activated carbon adsorption plate 401 traps the oily components and organic pollutants in the gas through physical adsorption, ultimately achieving harmless emission. This solution utilizes the suction of the original air compressor 108, which not only purifies the waste gas but also uses the airflow to drive the drive shaft 501 to rotate, thus eliminating the need for additional drive equipment to drive the drive shaft 501 and effectively reducing the operating cost.

[0041] In a preferred embodiment, a treatment box 2 is fixedly installed on the side of the treatment tank 1 near the inlet pipe 101. A filter plate 201 is fixedly installed inside the treatment box 2. The upper and lower ends of the treatment box 2 are respectively provided with an inlet and an outlet. The inlet of the treatment box 2 is connected to the inlet of the inlet pipe 101. A check valve 103 is located between the inlet of the treatment box 2 and the inlet of the inlet pipe 101.

[0042] A telescopic cylinder 203 is fixedly installed on one side of the treatment box 2. The telescopic end of the telescopic cylinder 203 extends into the treatment box 2 and is fixedly connected to a brush 202. The lower surface of the brush 202 slides against the upper surface of the filter plate 201. A waste discharge port 204 is opened on the side of the treatment box 2 away from the telescopic cylinder 203. A waste collection box 205 for collecting waste residue is installed on the side of the treatment box 2 near the waste discharge port 204.

[0043] Before entering the treatment tank 1 through the inlet pipe 101, the wastewater first flows through the filter plate 201 in the treatment box 2. The filter plate 201 can effectively intercept solid impurities in the wastewater, playing a preliminary filtration role, reducing the amount of impurities entering the treatment tank 1, and avoiding interference from impurities in subsequent processing such as oil separation, thus ensuring the smooth progress of coal chemical wastewater treatment. At the same time, the telescopic cylinder 203 on one side of the treatment box 2 can drive the brush 202 to slide on the upper surface of the filter plate 201. When there are many impurities attached to the filter plate 201, the telescopic cylinder 203 works, causing the brush 202 to clean the filter plate 201, brushing off the impurities on the filter plate 201. The brushed-off impurities can enter the waste collection box 205 through the waste outlet 204. This can clean the impurities on the filter plate 201 in a timely manner, prevent the accumulation of impurities from clogging the filter plate 201, ensure the filtration efficiency and service life of the filter plate 201, and ensure that the wastewater can continuously and smoothly pass through the filter plate 201 into the subsequent treatment stage.

[0044] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention.

Claims

1. An air flotation oil removal device for treating coal chemical wastewater, comprising a treatment tank (1), wherein a water inlet pipe (101) is fixedly connected to one side of the treatment tank (1), and a drain valve pipe (102) is fixedly connected to the bottom of the treatment tank (1), characterized in that, A check valve (103) is fixedly installed at the inlet of the water inlet pipe (101), and it also includes: The slide bar (3) is fixedly connected to the processing tank (1) at equal intervals around the circumference; The float sleeve (301) is slidably connected to the slide rod (3); The mesh plate (302) is fixedly connected between every two adjacent floating sleeves (301); The oil skimming hopper (303) is positioned between the multiple floating sleeves (301) and is fixedly connected to the multiple mesh plates (302) by a connecting rod; An oil discharge assembly for skimming oil from the skimming hopper (303) and a discharge treatment tank (1) is installed at the bottom opening of the skimming hopper (303); The jet assembly used to make the grease in the wastewater float to the surface to form scum is installed inside the treatment tank (1) and located below the slide bar (3); An air supply assembly for supplying air to the jet assembly is disposed on one side of the processing tank (1).

2. The air flotation oil removal device for coal chemical wastewater treatment according to claim 1, characterized in that, The oil drain assembly includes an oil drain pipe (304), the oil inlet of which is fixedly connected to the bottom opening of the skimming hopper (303), and the oil drain end of which extends out of the treatment tank (1).

3. The air flotation oil removal device for coal chemical wastewater treatment according to claim 2, characterized in that, It also includes an oil-in-water monitor (305), which is fixedly installed on the outer wall of the treatment tank (1), and the test terminals of the oil-in-water monitor (305) are installed inside the skimming hopper (303).

4. The air flotation oil removal device for coal chemical wastewater treatment according to claim 1, characterized in that, The jet assembly includes an annular diverter pipe (104), a connecting pipe (105), and an anti-clogging nozzle (106). The annular diverter pipe (104) is fixedly connected inside the treatment tank (1) and located between the water inlet pipe (101) and the drain valve pipe (102). The connecting pipe (105) is fixedly connected to the annular diverter pipe (104) at equal intervals, and the anti-clogging nozzle (106) is fixedly connected to the connecting pipe (105) at equal intervals.

5. The air flotation oil removal device for coal chemical wastewater treatment according to claim 4, characterized in that, The air supply assembly includes an air compressor (108), and a bracket (107) is provided on one side of the processing tank (1). The air compressor (108) is fixedly installed on the bracket (107), and the exhaust end of the air compressor (108) and the air inlet end of the annular split pipe (104) are connected to each other through an air supply pipe (109).

6. The air flotation oil removal device for coal chemical wastewater treatment according to claim 5, characterized in that, The upper part of the interior of the treatment tank (1) is rotatably connected to a drive shaft (501). The lower end of the drive shaft (501) is fixedly connected with multiple L-shaped square rods (502) at equal intervals around the circumference. A floating scraper (503) is slidably connected to the L-shaped square rods (502). The floating scraper (503) is inclined and located in the area between the float sleeve (301) and the inner wall of the treatment tank (1), and is used to push the floating oil sludge on the outer ring of the water surface toward the position of the skimming bucket (303).

7. The air flotation oil removal device for coal chemical wastewater treatment according to claim 6, characterized in that, An annular housing (5) is fixedly installed at the top of the treatment tank (1). The drive shaft (501) extends upward through one end of the treatment tank (1) into the annular housing (5). Multiple blades (5010) are fixedly connected in a circular pattern at equal intervals on the part of the drive shaft (501) located inside the annular housing (5). An exhaust pipe (504) and an exhaust pipe (505) are fixedly connected on the annular housing (5). A purification box (4) is fixedly installed at the upper end of the treatment tank (1). An activated carbon adsorption plate (401) is installed inside the purification box (4). The outlet of the exhaust pipe (505) is fixedly connected to the inlet of the purification box (4).

8. The air flotation oil removal device for coal chemical wastewater treatment according to claim 7, characterized in that, The air outlet of the purification box (4) and the air inlet of the air compressor (108) are fixedly connected by a connecting pipe (1010).

9. The air flotation oil removal device for coal chemical wastewater treatment according to claim 1, characterized in that, The treatment tank (1) is fixedly installed with a treatment box (2) on the side near the water inlet pipe (101). A filter plate (201) is fixedly installed inside the treatment box (2). The upper and lower ends of the treatment box (2) are respectively provided with a water inlet and a water outlet. The water inlet of the treatment box (2) is connected to the water inlet of the water inlet pipe (101). The check valve (103) is located between the water inlet of the treatment box (2) and the water inlet of the water inlet pipe (101).

10. The air flotation oil removal device for coal chemical wastewater treatment according to claim 9, characterized in that, A telescopic cylinder (203) is fixedly installed on one side of the treatment box (2). The telescopic end of the telescopic cylinder (203) extends into the treatment box (2) and is fixedly connected to a brush (202). The lower surface of the brush (202) slides against the upper surface of the filter plate (201). A waste discharge port (204) is opened on the side of the treatment box (2) away from the telescopic cylinder (203). A waste collection box (205) for collecting waste residue is installed on the side of the treatment box (2) near the waste discharge port (204).

Images