Special sewage treatment equipment for oil and gas fields
By introducing elastic filter membranes, suspension components, and cleaning components into oil and gas field wastewater treatment equipment, the problem of scrapers being unable to adapt to water level changes has been solved, achieving effective scum removal and increased equipment durability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-13
- Publication Date
- 2026-03-17
AI Technical Summary
In existing oil and gas field wastewater treatment equipment, the scraper cannot adapt to changes in water level, resulting in poor scum removal, easy overflow or adhesion of scum, and affecting the equipment's lifespan.
A wastewater treatment device including an elastic filter membrane, a suspension component, and a cleaning component was designed. The suspension component keeps the scraper in contact with the water surface, the inlet leads into the collection chamber, the cleaning component sprays diluted chemicals, and the limiting block adjusts the pore size of the filter membrane to ensure timely removal of scum and prevent adhesion.
It effectively removes scum, prevents leakage and adhesion, extends the service life of scrapers and filter membranes, and reduces labor costs and operational difficulty.
Smart Images
Figure CN121672674A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of sewage treatment, in particular to a special sewage treatment equipment for oil and gas fields. BACKGROUND
[0002] In the development and production process of oil and gas fields, a large amount of sewage containing oil stains, suspended solids and other impurities will be generated. If this kind of sewage is directly discharged, it will cause serious pollution to the surrounding environment such as soil and water body, and it also does not meet the environmental protection requirements. Therefore, it is a crucial link to effectively treat the sewage of oil and gas fields.
[0003] In the prior art, a scraper is usually used to remove the scum on the surface of the wastewater. However, the treatment capacity of the wastewater generated in the production process will change, so the water level height in the wastewater treatment equipment will also change. However, the installation height of the existing scraper is fixed and cannot change with the change of the water level height. When the water level is low, the scraper cannot remove the surface scum. When the water level is high, the lower side of the scraper will be inserted more below the water surface. During the scum removal process by the scraper, the scum will accumulate on one side of the scraper after being scraped by the scraper. With the accumulation of the scum, the height of the scum is easy to exceed the height of the scraper, and then the scum will flow back to the flotation tank from the other side of the scraper, which seriously affects the scum removal effect. SUMMARY
[0004] In order to overcome the shortcomings of the existing flotation tank that the height cannot change with the change of the water level height, resulting in poor scum removal effect of the scraper, the present application provides a special sewage treatment equipment for oil and gas fields.
[0005] The technical scheme of the present application is: a special sewage treatment equipment for oil and gas fields, comprising a flotation tank and a conveyor belt installed on the flotation tank; a plurality of scrapers are installed on the conveyor belt; a partition plate is fixedly connected in the flotation tank; further comprising a spring and a first fixed plate connected to the scraper; the front side and the rear side of the scraper are in contact with the inner wall of the flotation tank; a first filter membrane is connected to the scraper, and the first filter membrane is an elastic filter membrane; the first fixed plate, the first filter membrane and the scraper jointly form a collection cavity; a second fixed plate is fixedly connected to the side of the first filter membrane close to the scraper; the second fixed plate is fixedly connected to the scraper; a third fixed plate is fixedly connected to the side of the first filter membrane close to the first fixed plate; the third fixed plate is fixedly connected to the first fixed plate; a plurality of springs are connected between each second fixed plate and the corresponding third fixed plate; the first fixed plate is fixedly connected with a scraper; the scraper is provided with a drainage port; a suspension assembly for suspending the first fixed plate on the water surface is connected to the scraper; a cleaning assembly for cleaning the first filter membrane is connected to the flotation tank.
[0006] Furthermore, the suspension assembly includes a fixed block fixed to the conveyor belt; two symmetrical sliding blocks are fixed to each scraper; each sliding block slides up and down within the corresponding fixed block; and a suspension block is fixed to the underside of each first fixed plate.
[0007] Furthermore, the cleaning assembly includes a storage tank fixed to the flotation cell; a connecting pipe is fixed to the storage tank; several spray pipes are connected to the connecting pipe; each spray pipe faces the slag discharge trough; several contact parts are provided on the upper side of each first fixed plate; the contact parts are higher than the scraper; several limiting blocks for limiting the first fixed plate are rotatably connected to the connecting pipe by a torsion spring.
[0008] Furthermore, each scraper has a guide surface on one side used for scraping slag, and the guide surface is inclined from the middle to the front and rear sides.
[0009] Furthermore, the scraper is made of polytetrafluoroethylene.
[0010] Furthermore, it also includes an observation panel that is fixed to the liquid storage tank.
[0011] Furthermore, the observation panel is equipped with scale lines.
[0012] Furthermore, it also includes a fourth fixing plate fixed to the second fixing plate; each fourth fixing plate has a first through groove in the middle; each fourth fixing plate has a fixing frame detachably connected to its lower side; each fixing frame has a second filter membrane fixed in it, and each second filter membrane has an oil test paper attached to its lower surface.
[0013] Furthermore, it also includes a fifth fixing plate fixed to the third fixing plate; each fifth fixing plate has a second through groove in the middle; each fifth fixing plate has a third through groove on the side facing the corresponding third fixing plate. In the initial state, the first through groove is connected to the second through groove, and the fourth fixing plate seals the lower side of the third through groove.
[0014] Furthermore, it also includes a sponge block fixed to the second filter membrane.
[0015] The beneficial effects of this invention are as follows: By ensuring that both the front and rear sides of the scraper are in contact with the inner wall of the flotation cell, this invention prevents scum from overflowing from the front and rear sides of the scraper during the scraping process, thus avoiding affecting the scraping effect. At the same time, the scraper removes the scum adhering to the inner wall of the flotation cell, and the wastewater and scum collected on the right side of the scraper are guided into the collection chamber through the drainage port. This prevents the wastewater and scum from accumulating on the right side of the scraper and overflowing back into the flotation cell. Furthermore, the drainage port faces the scraper, and as the wastewater and scum flow into the collection chamber, the continuously flowing wastewater washes the scraper, preventing the scraped scum from remaining on the scraper for a long time, which would cause the scum to adhere to the scraper, corrode the scraper, and affect its service life. The pump on the connecting pipe draws the agent used to dilute oil stains from the storage tank and sprays it into the slag discharge tank through the spray pipe. This dilutes and deodorizes the scum scraped into the slag discharge tank. The first fixed plate is limited by the limiting block. As the scraper moves to the right, the first filter membrane is pulled open, making the mesh of the first filter membrane larger. Then, the agent sprayed through the spray pipe flushes out the scum and oil stains intercepted by the first filter membrane, cleaning the first filter membrane and preventing scum from adhering to the first filter membrane for a long time, which would corrode the first filter membrane and affect its service life. The wastewater flowing out of the first filter membrane is intercepted by the second filter membrane. When the wastewater flowing out of the first filter membrane contains oil, the oil test paper will come into contact with the oil and undergo a chemical reaction, turning dark blue. Workers only need to check whether the oil test paper has changed color to determine whether the first filter membrane is damaged. When the first filter membrane is clogged, workers only need to check whether there are dried or insufficiently moist sponge blocks to determine whether the first filter membrane is clogged. No complicated instruments or professional technology are required, which reduces labor costs and operational difficulty. Attached Figure Description
[0016] Figure 1 This is a three-dimensional structural diagram of the special wastewater treatment equipment for oil and gas fields according to the present invention; Figure 2 This is a cross-sectional view of the flotation cell of the present invention; Figure 3 This is a three-dimensional structural diagram of the combination of scraper, fixing block, sliding block, first fixing plate, suspension block and scraper of the present invention; Figure 4 This is a three-dimensional structural diagram of the combination of the spring, the first filter membrane, the second fixing plate, and the third fixing plate of the present invention. Figure 5 This is a three-dimensional structural diagram of the fourth fixing plate, the fifth fixing plate, the fixing frame, and the second filter membrane combination of the present invention; Figure 6 This is a three-dimensional structural diagram of the combination of the connecting pipe, spray pipe and limiting block of the present invention; Figure 7 This is a diagram showing the first through-slot sealing state of the present invention; Figure 8 This is an exploded view of the fourth fixing plate, the fifth fixing plate, and the fixing frame of the present invention.
[0017] In the attached diagram, the markings are as follows: 1-flotation cell, 1001-inlet, 1002-outlet, 1003-slag discharge port, 1004-slag discharge trough, 1005-reaction tank, 2-conveyor belt, 3-scraper, 3001-drainage port, 3002-guide surface, 4-partition plate, 101-fixed block, 102-sliding block, 103-spring, 104-first fixed plate, 10401-collection chamber, 10402-contact part, 105-suspended block, 106-scraper Knife, 107-First filter membrane, 108-Second fixing plate, 109-Third fixing plate, 201-Liquid storage tank, 202-Connecting pipe, 203-Spraying pipe, 204-Limiting block, 205-Observation plate, 20501-Scale line, 301-Fourth fixing plate, 30101-First through groove, 302-Fifth fixing plate, 30201-Second through groove, 30202-Third through groove, 303-Fixed frame, 304-Second filter membrane, 305-Sponge block. Detailed Implementation
[0018] The embodiments of the present invention will be described below with reference to the accompanying drawings.
[0019] Example 1: A specialized wastewater treatment device for oil and gas fields, such as... Figures 1-8 As shown, the flotation tank includes a flotation cell 1, a conveyor belt 2, scrapers 3, and a partition plate 4. The conveyor belt 2 is installed on the flotation cell 1. Several scrapers 3 are connected to the conveyor belt 2. The partition plate 4 is fixedly connected inside the flotation cell 1. A slag discharge trough 1004 is formed between the right side of the partition plate 4 and the flotation cell 1. A reaction tank 1005 is formed between the left side of the partition plate 4 and the flotation cell 1. A water inlet 1001 is provided on the left side of the flotation cell 1, and a drain outlet 1002 is provided on the front side of the flotation cell 1. A slag discharge outlet 1003 is provided on the right side of the flotation cell 1. The slag discharge outlet 1003 is connected to the slag discharge trough 1004. An inclined surface is provided on the left side of the partition plate 4, and the water level in the flotation cell 1 varies within the height range of the inclined surface on the left side of the partition plate 4. It also includes a spring 103, a first fixing plate 104, a scraper 106, a first filter membrane 107, a second fixing plate 108, a third fixing plate 109, a suspension assembly, and a cleaning assembly; the first fixing plate 104 is connected to the scraper 3; the first filter membrane 107 is connected to the scraper 3, and the first filter membrane 107 is an elastic filter membrane; the first fixing plate 104, the first filter membrane 107, and the scraper 3 together form a collection chamber 10401; the second fixing plate 108 is fixedly connected to the side of the first filter membrane 107 near the scraper 3; the second fixing plate 108 and the scraper 3... Fixed connection; a third fixed plate 109 is fixedly connected to the side of the first filter membrane 107 near the first fixed plate 104; the third fixed plate 109 is fixedly connected to the first fixed plate 104; two symmetrical springs 103 are connected between each second fixed plate 108 and the corresponding third fixed plate 109; scrapers 106 are fixedly connected to the front and rear sides of the first fixed plate 104; the scraper 3 has a flow outlet 3001 on the front and rear sides, and the flow outlet 3001 faces the scraper 106; a suspension component is connected to the scraper 3; a cleaning component is connected to the flotation tank 1.
[0020] In this embodiment, oilfield wastewater enters the reaction tank 1005 of the flotation tank 1 through the inlet 1001. The wastewater is then subjected to air flotation treatment by the wastewater treatment system within the flotation tank 1. After air flotation treatment, harmful substances, pollutants, and oil impurities in the wastewater are suspended on the surface. At this point, viewed from front to back, the conveyor belt 2 is driven by a motor to rotate counterclockwise, which in turn drives the scraper 3 to move counterclockwise. When the scraper 3 reaches the underside of the conveyor belt 2, it contacts the water surface of the flotation tank 1. Simultaneously, the suspension assembly causes the scraper 3 to... After contacting the water surface of the flotation cell 1, the scraper 3 remains suspended on the water surface to avoid changes in the relative position of the scraper 3 and the water surface due to changes in the amount of wastewater treated in the flotation cell 1, which would affect the scraping effect of the scraper 3 on the scum. When the scraper 3 contacts the water surface, as the scraper 3 rotates, the scraper 3 will scrape the scum suspended on the surface of the wastewater from left to right to the scum discharge tank 1004. The scum scraped into the scum discharge tank 1004 will then flow into the subsequent treatment equipment through the scum discharge port 1003. The wastewater in the flotation cell 1 that has been treated by the wastewater treatment system will be discharged through the drain port 1002 and backfilled into the oil field.
[0021] Furthermore, both the front and rear sides of the scraper 3 are in contact with the inner wall of the flotation cell 1 to prevent scum from overflowing from the front and rear sides of the scraper 3 during the scraping process, which would affect the scraping effect of the scraper 3. Further considering that as the scraper 3 moves from left to right, wastewater and scum will accumulate on the right side of the scraper 3, causing them to flow back into the flotation cell 1, affecting the scraping efficiency, when the accumulated wastewater and scum reach the inlet 3001, they will flow into the collection chamber 10401 through the inlet 3001. This prevents the wastewater and scum from accumulating on the right side of the scraper 3 and flowing back into the flotation cell 1. However, considering that scum easily adheres to the flotation cell 1 during wastewater treatment, [further details are needed]. On the inner wall, when the scum is guided to the inlet 3001 on the front and inner side of the flotation cell 1, it will also come into contact with the inner wall of the flotation cell 1 and adhere to the inner wall of the flotation cell 1. Therefore, during the scraping of the scum by the scraper 3, the scum adhering to the inner wall of the flotation cell 1 is scraped off by the scraper 106. The inlet 3001 faces the scraper 106. During the process of the wastewater and scum flowing to the collection chamber 10401, the scum scraped off by the scraper 106 can also be flushed onto the first filter membrane 107, and then the scum is intercepted by the first filter membrane 107. At the same time, the scraper 106 is washed by the continuously flowing wastewater to prevent the scraped scum from staying on the scraper 106 for a long time, causing the scum to adhere to the scraper 106, corroding the scraper 106, and affecting the service life of the scraper 106.
[0022] Furthermore, considering that the scum formed from oilfield wastewater has high adhesiveness, and that the scum easily adheres to the scum discharge trough 1004 after being scraped, and that the scum also adheres to the scraper 3 and the first filter membrane 107 during the scraping process, causing corrosion to the scraper 3 and the first filter membrane 107 and affecting their service life, during the operation of the flotation cell 1, a cleaning component sprays reagents into the scum discharge trough 1004 to dilute the oily scum in the scum discharge trough 1004. And, based on a front-to-back view, as... Figure 6 and Figure 7As shown: When the scraper 3 and the first fixed plate 104 move to the right side of the conveyor belt 2, that is, above the slag discharge trough 1004, the spray pipe 203 is directly facing the first filter membrane 107, and then the agent is sprayed through the spray pipe 203 to clean the first filter membrane 107. However, considering that the scum trapped on the first filter membrane 107 is difficult to flush out, and the first fixed plate 104 and the scraper 3 are constantly moving, the rinsing time of the first filter membrane 107 is short, and it is also impossible to flush the scum and oil from the top of the first filter membrane 107 into the slag discharge trough 1004, resulting in poor cleaning effect. Therefore, when the scraper 3 moves to the right side of the conveyor belt 2, that is, above the slag discharge trough 1004, the cleaning time is short. When scraper 3 and the first fixing plate 104 move to the upper side of the slag discharge trough 1004, the contact part 10402 on the first fixing plate 104 will contact the limiting block 204, thereby limiting the first fixing plate 104 through the limiting block 204. During this process, scraper 3 continues to move to the right, thereby driving the second fixing plate 108 and the first filter membrane 107 to move to the right. At this time, spring 103 is stretched (it should be noted that the torsion force of the torsion spring connecting the limiting block 204 and the connecting pipe 202 is greater than the elastic force of spring 103), thereby pulling the first filter membrane 107 open, so that the first filter membrane 107 As the mesh size increases, the cleaning agent sprayed through the spray pipe 203 can flush out the scum and oil trapped by the first filter membrane 107, which then flows into the scum discharge tank 1004. This process cleans the first filter membrane 107, preventing scum from adhering to it for extended periods and causing corrosion, thus extending its service life. Furthermore, by adjusting the operation of the conveyor belt 2, it can pause for 5 seconds when the first filter membrane 107 is pulled apart, extending the time the first filter membrane 107 is within the spray range of the spray pipe 203. The residence time is reduced to improve the cleaning effect. After cleaning the first filter membrane 107, as the scraper 3 continues to move to the right, the spring 103 is continuously stretched, and the reset force continues to increase. When the reset force of the spring 103 is greater than the torque of the torsion spring connecting the limit block 204 and the connecting pipe 202, the limit block 204 is squeezed by the first fixing plate 104 and rotates. The torsion spring is twisted and compressed, causing the contact part 10402 to pass over the limit block 204. Then the spring 103 resets, thereby driving the first fixing plate 104 and the first filter membrane 107 to reset, and the limit block 204 also rotates and resets.
[0023] In some optional implementations of this embodiment, such as Figures 1-3 As shown, the suspension assembly includes a fixed block 101, a sliding block 102, and a suspension block 105; several fixed blocks 101 are fixedly connected to the conveyor belt 2; two sliding blocks 102 symmetrically connected to each scraper 3 are fixedly connected to each scraper 3; each sliding block 102 slides up and down within the corresponding fixed block 101; a suspension block 105 is fixedly connected to the lower side of each first fixed plate 104.
[0024] In this embodiment, the specific working principle of the suspension component is as follows: The scraper 3 is slidably connected to the fixed block 101 via the sliding block 102. When the scraper 3 and the first fixed plate 104 move to the lower side of the conveyor belt 2, the suspension block 105 will come into contact with the water surface. At this time, affected by buoyancy, the sliding block 102 slides upward on the fixed block 101, and the scraper 3 and the first fixed plate 104 will float upward. At this time, the water level in the flotation tank 1 is always located on the lower surface of the suspension block 105, thereby adapting to the change in the height of the sewage water surface in the flotation tank 1, so that the relative position of the scraper 3 and the water surface remains unchanged, thereby ensuring the scraping effect of the scraper 3.
[0025] In some optional implementations of this embodiment, such as Figure 1 , Figure 2 and Figure 6 As shown, the cleaning assembly includes a storage tank 201, a connecting pipe 202, a spray pipe 203, and a limiting block 204. The storage tank 201 is fixedly connected to the front side of the flotation cell 1. The storage tank 201 stores a chemical agent for diluting oil stains (the chemical agent is a high-efficiency degreasing agent mixed with water in a certain proportion). The connecting pipe 202 is fixedly connected to the storage tank 201, and a pump is installed on the connecting pipe 202. Three spray pipes 203 are connected to the connecting pipe 202. Each spray pipe 203 faces the slag discharge tank 1004. Two contact parts 10402 are provided on the upper side of each first fixed plate 104. The height of the contact parts 10402 is higher than that of the scraper 3. Two limiting blocks 204 are rotatably connected to the connecting pipe 202 by a torsion spring.
[0026] In this embodiment, the specific working principle of the cleaning component is as follows: During the operation of the flotation cell 1, the pump on the connecting pipe 202 draws the agent used to dilute the oil stains in the storage tank 201 (the agent is a high-efficiency degreasing agent and water mixed in proportion), and sprays it into the slag discharge tank 1004 through the spray pipe 203 to dilute the scum scraped into the slag discharge tank 1004, thereby pre-treating the oil-containing scum and preventing the oil-containing scum from adhering to the slag discharge tank 1004. When the first filter membrane 107 and the scraper 3 move into the spraying range of the spray pipe 203, the agent is sprayed onto the first filter membrane 107, the scraper 3 and their associated parts to rinse the first filter membrane 107, the scraper 3 and their associated parts.
[0027] In a further preferred embodiment of the present invention, such as Figure 3 As shown, each scraper 3 has a guide surface 3002 on one side for scraping slag, and the guide surface 3002 is inclined from the middle to the front and rear sides.
[0028] In this embodiment, the sewage and scum gathered on the right side of the scraper 3 are guided to the inlet 3001 by the guide surface 3002.
[0029] In a further preferred embodiment of the present invention, such as Figure 3As shown, scraper 3 is made of polytetrafluoroethylene.
[0030] In this embodiment, the scraper 3 has high corrosion resistance, which greatly improves the service life of the scraper 3, and the surface is smooth, making it easy to clean as it is not easy for scum to adhere.
[0031] In a further preferred embodiment of the present invention, such as Figure 1 As shown, it also includes an observation plate 205; the observation plate 205 is fixedly connected to the middle of the liquid storage tank 201, and the observation plate 205 is made of acrylic material with a light transmittance of more than 70%.
[0032] In this embodiment, workers can observe the dosage of medicine in the storage tank 201 through the observation board 205 and add medicine to the storage tank 201 in a timely manner.
[0033] In a further preferred embodiment of the present invention, such as Figure 1 As shown, the observation plate 205 is equipped with scale lines 20501.
[0034] In this embodiment, workers can visually view the remaining amount of medicine in the storage tank 201 through the scale line 20501, making it convenient for workers to add medicine as needed.
[0035] Example 2: Based on Example 1, such as Figures 4-8 As shown, it also includes a fourth fixing plate 301, a fixing frame 303, and a second filter membrane 304; each fourth fixing plate 301 has a first through groove 30101 in the middle; each second fixing plate 108 is fixedly connected to a fourth fixing plate 301; each fourth fixing plate 301 is detachably connected to a fixing frame 303 on its lower side; each fixing frame 303 is fixedly connected to a second filter membrane 304, and each second filter membrane 304 has an oil test paper on its lower surface.
[0036] In this embodiment, considering that the first filter membrane 107 will inevitably be damaged due to aging and oil corrosion during long-term use, affecting its interception effect on oil and scum, and that it is difficult for workers to detect the problem with the naked eye, when filtering oil and scum through the first filter membrane 107, the wastewater can normally flow down through the first filter membrane 107 to the fourth fixed plate 301, and then flow into the second filter membrane 304 through the first channel 30101, and then flow back into the flotation tank 1 through the second filter membrane 304, while the oil and scum are intercepted by the first filter membrane 107. When the first filter membrane 107 is damaged, oil and scum will flow through the first filter membrane 107 to the fourth fixed plate 301. At this time, the second filter membrane 304 can intercept the oil and scum again, preventing the oil and scum from flowing back into the flotation tank 1. After the oil and scum flow to the second filter membrane 304, the oil test paper on the lower side of the second filter membrane 304 will come into contact with the oil and react chemically to turn dark blue. Therefore, when inspecting, workers only need to check whether the oil test paper has changed color to determine whether the first filter membrane 107 is damaged, find the problem in time, and replace the first filter membrane 107.
[0037] In a further preferred embodiment of the present invention, such as Figures 4-8 As shown, it also includes a fifth fixing plate 302; a fifth fixing plate 302 is fixedly connected to each third fixing plate 109; a second through groove 30201 is opened in the middle of each fifth fixing plate 302; a third through groove 30202 is opened on the side of each fifth fixing plate 302 facing the corresponding third fixing plate 109. In the initial state, the first through groove 30101 is connected to the second through groove 30201, and the fourth fixing plate 301 seals the lower side of the third through groove 30202.
[0038] In this embodiment, considering that when the first filter membrane 107 is cleaned by the cleaning component, the cleaning agent will also flow into the second filter membrane 304, causing oil stains in the second filter membrane 304 to be diluted by the cleaning agent sprayed by the cleaning component, resulting in the inability of workers to observe the discoloration of the oil test paper during subsequent inspections, causing detection errors, therefore, in the initial state, the lower side of the third channel 30202 is blocked by the fourth fixing plate 301, and the first channel 30101 is connected to the second channel 30201. When the scraper 3 moves normally and scrapes the scum on the surface of the flotation tank 1, the sewage entering the collection chamber 10401 flows down through the first filter membrane 107 to the fourth fixing plate 301, and then the sewage flows from the second channel 30201 and the first channel 30101 to the second filter membrane 304. When the second fixing plate 108 and the first filter membrane 107 move to the right, the spring 103 is subjected to After stretching, the first filter membrane 107 is pulled open, and the second fixing plate 108 will drive the fourth fixing plate 301 to move to the right. At this time, the fourth fixing plate 301 and the fifth fixing plate 302 will have relative displacement, and the first channel 30101 and the second channel 30201 will be misaligned. Then, the fifth fixing plate 302 will block the first channel 30101 to prevent the cleaning agent from flowing into the second filter membrane 304 through the first channel 30101 during the cleaning process. After the first channel 30101 and the second channel 30201 are misaligned, the fourth fixing plate 301 will release the blockage of the third channel 30202. Therefore, the cleaning agent flowing to the fifth fixing plate 302 will flow into the slag discharge tank 1004 through the third channel 30202. This avoids the problem that the cleaning agent dilutes the oil on the second filter membrane 304, which would affect the workers' judgment of the condition of the first filter membrane 107 during subsequent inspections.
[0039] In a further preferred embodiment of the present invention, such as Figures 5-7 As shown, it also includes a sponge block 305; several sponge blocks 305 are fixed to the lower side of each second filter membrane 304.
[0040] In this embodiment, considering that the first filter membrane 107 may become clogged after prolonged use, preventing wastewater from flowing back to the flotation tank 1, when wastewater cannot pass through the first filter membrane 107 or only a small amount of wastewater passes through it, some of the sponge blocks 305 will inevitably be unable to absorb water or can only absorb a small amount of water, resulting in drying. Therefore, during inspection, workers only need to check whether there are dried or insufficiently moist sponge blocks 305 to determine whether the first filter membrane 107 is clogged. When the scraper 3, the first fixing plate 104, and the suspended block 105 rotate to the lower side of the conveyor belt 2, the suspended block 105 floats on the water surface, while the fixing frame 303, the second filter membrane 304, and the sponge block 305 are all located above the suspended block 105, thereby preventing the fixing frame 303, the second filter membrane 304, the oil test paper, and the sponge block 305 from contacting the wastewater and scum in the flotation tank 1, which would affect the subsequent monitoring of the status of the first filter membrane 107 by the workers.
[0041] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.
Claims
1. A special-purpose sewage treatment device for oil and gas fields, comprising a flotation tank (1) and a conveyor belt (2) installed on the flotation tank (1); a plurality of scrapers (3) are connected to the conveyor belt (2); a partition plate (4) is fixedly connected in the flotation tank (1); characterized in that: The spring (103) and the first fixed plate (104) connected to the scraper (3) are further included; the front side and the rear side of the scraper (3) are in contact with the inner wall of the flotation tank (1); the scraper (3) is connected with the first filter membrane (107), and the first filter membrane (107) is an elastic filter membrane; the first fixed plate (104), the first filter membrane (107) and the scraper (3) jointly form a collection cavity (10401); the side of the first filter membrane (107) facing the scraper (3) is fixedly connected with a second fixed plate (108); the second fixed plate (108) is fixedly connected with the scraper (3); the side of the first filter membrane (107) close to the first fixed plate (104) is fixedly connected with a third fixed plate (109); the third fixed plate (109) is fixedly connected with the first fixed plate (104); a plurality of springs (103) are connected between each second fixed plate (108) and the corresponding third fixed plate (109); the first fixed plate (104) is fixedly connected with a scraper knife (106); the scraper (3) is provided with a drainage port (3001); the scraper (3) is connected with a suspension assembly for suspending the first fixed plate (104) on the water surface; the flotation tank (1) is connected with a cleaning assembly for cleaning the first filter membrane (107).
2. A special-purpose sewage treatment apparatus for oil and gas fields according to claim 1, characterized in that: The suspension assembly includes a fixed block (101) fixed to the conveying belt (2); each scraper (3) is fixedly connected with two front and rear symmetrical sliding blocks (102); each sliding block (102) slides up and down in the corresponding fixed block (101); the lower side of each first fixed plate (104) is fixedly connected with a suspension block (105).
3. The special-purpose sewage treatment apparatus for oil and gas fields according to claim 1, characterized by: The cleaning assembly includes a liquid storage tank (201) fixed to the flotation tank (1); the liquid storage tank (201) is fixedly connected with a connecting pipe (202); a plurality of spray pipes (203) are communicated on the connecting pipe (202); each spray pipe (203) faces the residue discharge groove (1004); a plurality of contact portions (10402) are arranged on the upper side of each first fixed plate (104); the contact portion (10402) is higher than the scraper (3); a plurality of limiting blocks (204) for limiting the first fixed plate (104) are rotatably connected on the connecting pipe (202) through torsional springs.
4. The special-purpose sewage treatment apparatus for oil and gas fields according to claim 3, characterized by: Each side of the scraper (3) for scraping residue is provided with a guide surface (3002), and the guide surface (3002) is inclinedly arranged from the middle part to the front side and the rear side.
5. A dedicated sewage treatment plant for oil and gas fields according to claim 4, characterized in that: The scraper (3) is made of polytetrafluoroethylene.
6. The special-purpose sewage treatment apparatus for oil and gas fields according to claim 3, characterized by: Further comprising an observation plate (205) fixed to the liquid storage tank (201).
7. A dedicated sewage treatment plant for oil and gas fields according to claim 6, characterized in that: The observation plate (205) is provided with a scale line (20501).
8. The special-purpose sewage treatment apparatus for oil and gas fields according to claim 1, characterized by: Further comprising a fourth fixed plate (301) fixed to the second fixed plate (108); a first through groove (30101) is formed in the middle part of each fourth fixed plate (301); a fixed frame (303) is detachably connected to the lower side of each fourth fixed plate (301); a second filter membrane (304) is fixedly connected in each fixed frame (303), and an oil test paper is attached to the lower surface of each second filter membrane (304).
9. The special-purpose sewage treatment apparatus for oil and gas fields according to claim 1, characterized by: The fifth fixing plate (302) is fixed to the third fixing plate (109), a second through slot (30201) is arranged in the middle of each fifth fixing plate (302), a third through slot (30202) is arranged on the side of each fifth fixing plate (302) facing the corresponding third fixing plate (109), the first through slot (30101) and the second through slot (30201) are communicated in the initial state, and the fourth fixing plate (301) is located below the third through slot (30202) and seals the third through slot (30202).
10. The special-purpose sewage treatment apparatus for oil and gas fields according to claim 8, characterized by: The sponge block (305) is fixed to the second filter membrane (304).