Backwash filter for water cutting of storage tank and filtering method of backwash filter

Abstract

The invention belongs to the technical field of filters, and particularly discloses a backwash filter for water draining of a storage tank, which comprises a settler, a filter body and a filter element, a scraping brush device is mounted on the filter body, the filter body is connected to the bottom of the settler, and the side wall of the upper part of the settler is communicated with the top of a water draining tank; the outlet of the filter body is communicated with the convection pipe through a filtering thin pipe and is connected with a valve, the lower end of the pipe joint is connected with a backwashing water pipe, and the settler further comprises a cut-off device. According to the filter, before the water cutting work, the pressure of the spherical tank and the water cutting tank is balanced, the cut-off device is opened, the spherical tank, the settler, the convection tube and the water cutting tank are communicated with a gas-liquid mixture, liquid hydrocarbon and water can be separated in a convection mode, impurities in the settler are settled in time, and inconvenience in cleaning and potential safety hazards caused by the fact that the impurities enter the water cutting tank are avoided; after water cutting, the mixture unidirectionally flows to the water cutting tank, the passage is cut off, the mixture is filtered and then flows into the water cutting tank until one-way flowing is finished, the cut-off device is opened to enter a convection stage, impurities are prevented from entering the water cutting tank due to insufficient sedimentation in the one-way flowing stage, and the process is simple, convenient, safe and reliable.

Description

Technical Field

[0001] The present invention belongs to the technical field of filter products, and specifically discloses a backwashing filter for water cutting of a storage tank and a filtering method thereof. Background Art

[0002] In the prior art, as Figure 1 shown, a certain amount of water will accumulate at the bottom of a spherical tank 1' for storing liquefied hydrocarbons. Before using the liquid hydrocarbon, a water cutting tank 2' needs to be connected to the bottom end of the spherical tank 1'. After opening the ball root valve 3' at the bottom of the spherical tank 1' and the inlet valve 4' before entering the water cutting tank 2', the liquid hydrocarbon containing water is transported to the water cutting tank 2'. Then, the ball root valve 3' and the inlet valve 4' are closed. The water cutting tank 2' starts the water cutting treatment work. When the water in the water cutting tank 2' is completely drained (monitored by a liquid level gauge 5'), at this time, the inside of the water cutting tank 2' is all liquid hydrocarbon. Then, the inlet valve 4' and the ball root valve 3' are opened, and the liquid hydrocarbon inside the water cutting tank 2' is recycled into the spherical tank 1'. At this time, the pressure inside the water cutting tank 2' is less than that of the spherical tank 1'. The moment the inlet valve 4' is opened, due to the pressure difference on both sides, the water cutting tank 2' will vibrate, seriously affecting the service performance and service life of the water cutting tank 2', and the safety reliability is also greatly reduced.

[0003] In addition, rust slag or powder and other impurities will accumulate at the bottom of the spherical tank 1'. During the water cutting operation, the impurities will enter the inside of the water cutting tank 2' along with the water. In order to improve the water cutting effect, it is necessary to regularly clean the impurities in the water cutting tank 2'. Usually, when cleaning the water cutting tank 2', all the liquefied hydrocarbons in the water cutting tank 2' need to be drained completely before cleaning. The cleaning process is extremely cumbersome and troublesome. Moreover, when the water cutting tank 2' is put into use again after cleaning, the water cutting tank 2' needs to be completely filled with water in advance to prevent air from entering, then connected to the spherical tank 1', and then the water is drained to avoid the potential safety hazard of air accidentally entering the spherical tank 1'.

[0004] In order to solve the problem of inconvenient cleaning of the water cutting tank 2' caused by impurities, a set of online-cleanable filters is installed at the inlet of the water cutting tank. However, the commonly used ordinary filters at present are not applicable. After the filter is blocked, the water in the spherical tank 1' cannot enter the water cutting tank 2' anymore, and the liquefied hydrocarbon in the water cutting tank 2' cannot return to the inside of the spherical tank 1' either. At this time, the spherical tank 1' and the water cutting tank 2' are in a separated state, and it is impossible to ensure the smooth progress of the water cutting work, affecting the water cutting effect.

[0005] Therefore, it is extremely urgent to research a backwashing filter for water cutting of a storage tank that can perform reverse flushing and ensure the safe and smooth progress of the water cutting work, a water cutting system using this filter, and a water cutting method thereof. Summary of the Invention

[0006] The object of the present invention is to overcome the deficiencies of the prior art, and specifically provides an anti-flushing filter for water drainage of storage tanks. This filter ensures that before the substances in the spherical tank enter the water drainage tank for water drainage, the liquid hydrocarbon and water can be separated by convection, and the impurities can be settled in time, avoiding the inconvenience of cleaning and potential safety hazards brought by the entry of impurities into the interior of the water drainage tank. At the same time, after the water drainage operation, the mixture can only pass through the filter unidirectionally and flow into the water drainage tank through the filter fine pipe until the unidirectional flow ends. Then the intercepting device opens to enter the convection stage, preventing impurities from entering the water drainage tank due to insufficient settlement during the unidirectional flow stage. The process is simple, convenient, safe and reliable.

[0007] In order to achieve the above technical object, the present invention is implemented according to the following technical solutions:

[0008] An anti-flushing filter for water drainage of storage tanks according to the present invention includes a settler, a filter body, and a filter element with a filter screen inside the filter body. A scraping device for brushing the filter element is installed on the filter body. The inlet of the filter body is connected to the bottom of the settler through a connecting pipe, and a switching valve is provided on the connecting pipe. The top of the settler is connected to the bottom of the spherical tank through a spherical tank outlet pipe and a ball valve. The upper side wall of the settler is connected to the top of the water drainage tank through a convection pipe, and an inlet valve is provided on the convection pipe. The spherical tank outlet pipe extends into the interior of the settler adjacent to the position of the lowermost water outlet of the settler. The upper side water outlet of the settler is connected to the convection pipe. A pipe joint is provided on the side wall of the filter body. The outlet of the filter body and the convection pipe are connected through a filter fine pipe and are equipped with a valve. The lower end of the pipe joint is connected to an anti-flushing water pipe with a valve. The settler further includes an intercepting device that can cut off the entry of the gas-liquid mixture into the interior of the water drainage tank through the convection pipeline when the gas-liquid mixture flows unidirectionally from the spherical tank to the water drainage tank. A drainage pipeline is provided at the bottom of the filter body.

[0009] In the present invention, the intercepting device can be implemented in the following two structural forms:

[0010] First, the intercepting device is a rotatable inverted L-shaped baffle installed inside the settler corresponding to the position of the convection pipe orifice. The vertical plate height of the inverted L-shaped baffle is greater than the diameter of the convection pipe orifice, and the weight of the horizontal plate of the inverted L-shaped baffle is greater than the weight of the vertical plate.

[0011] Second, an electromagnetic valve is installed at the inlet of the convection pipe, and the electromagnetic valve is closed when the gas-liquid mixture flows unidirectionally from the spherical tank to the water drainage tank.

[0012] As a further improvement of the above technology, the scraping device includes mounting plates installed at the bottom and top of the filter element inside the filter body, a rotating shaft movably connected to the center of the mounting plate, and several groups of wire brushes with bristles or several groups of plastic scrapers fixed on the rotating shaft. A driving device for driving the rotation of the rotating shaft is provided at the top of the rotating shaft.

[0013] To improve the applicability in different scenarios, the drive device can also be in the following two structural forms:

[0014] First, the drive device includes a coupling placed at the top of the rotating shaft and a flange handle mounted on the coupling.

[0015] Second, the drive device is a rotary handle mounted on the top of the rotating shaft.

[0016] As a further improvement of the above technology, the drain pipe is provided with a water seal elbow and a drain valve. The water surface height of the water seal elbow entering the outlet valve is higher than the plane where the lowest position of the water seal elbow is located, effectively preventing the gas inside the filter body from being discharged through the drain pipe.

[0017] As a further improvement of the above technology, in order to extend the flow path and facilitate the sedimentation of impurities, a buffer pipe with a diameter larger than the water outlet pipe of the spherical tank is provided inside the sedimentation tank. A first convection port is provided on the side of the water outlet pipe of the spherical tank close to the convection pipe. Correspondingly, a second convection port is provided on the opposite side of the buffer pipe. The height positions and diameters of the first convection port and the second convection port correspond to the pipe orifice position and diameter of the convection pipe.

[0018] The present invention also discloses an anti - flushing filtration method for the above - mentioned anti - flushing filter for water cutting of storage tanks, and its specific steps are as follows:

[0019] (1) Open the ball valve at the bottom of the spherical tank. The gas - liquid mixture inside the spherical tank enters the sedimentation tank in sequence. At this time, the pressure inside the sedimentation tank is relatively high, and the intercepting device starts to work, and the convection pipe is closed. At this time, the gas - liquid mixture flows into the filter through the bottom outlet of the sedimentation tank, and after passing through the filter body for filtration, it then flows into the water - cutting tank unidirectionally through the filter fine pipe and the convection pipe. At this time, the impurities in the gas - liquid mixture will settle to the bottom of the filter body;

[0020] (2) When the pressures of the sedimentation tank and the water - cutting tank are balanced, the intercepting device opens, and the passage of the spherical tank - sedimentation tank - convection pipe - water - cutting tank is connected. After the liquid hydrocarbon enters the sedimentation tank through the convection pipe, it flows back into the spherical tank for liquid hydrocarbon recovery. At this time, the impurities in the gas - liquid mixture will settle to the bottom of the sedimentation tank;

[0021] (3) Close the ball root valve and the inlet valve. The water - cutting tank conducts dehydration work. When all the water in the water - cutting tank is removed, open the inlet valve and the ball root valve. At this time, due to the pressure difference, the mixture flows from the spherical tank through the sedimentation tank to the water - cutting tank. Close the intercepting device, and the mixture can only flow into the water - cutting tank through the filter and the fine pipe until the pressure is balanced, and repeat the cycle multiple times;

[0022] When the filter needs to be scraped and rinsed, close the inlet valve, the bulb valve, and the switch valve, open the valve, connect the backwash water pipe, fill the inside of the filter body with water, start the scraping device to scrape and rinse the filter screen of the filter element, and discharge the sewage after rinsing through the drainage pipeline.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] (1) For the backwash filter for tank water drainage of the present invention, the gas-liquid mixture to be drained from the spherical tank to the water drainage tank can enter the inside of the filter body unidirectionally for filtration, and the impurities in the mixture can be sedimented, filtered, and recovered in a timely and effective manner; when the pressure is balanced, the passage of the spherical tank - settler - convection pipe - water drainage tank is connected, and the water and liquid hydrocarbons in the mixture can be separated by convection, and the liquid hydrocarbons can be smoothly recovered without being affected by the filter.

[0025] (2) For the backwash filter for tank water drainage of the present invention, it can better complete the backwash. Open the valve, connect the connecting water pipe, the water enters the inside of the filter body, and the filter element is thoroughly cleaned and cleaned through the mesh brush device, effectively improving the service life of the valve core and ensuring the filtering effect of the filter.

[0026] (3) For the backwash filter for tank water drainage of the present invention, it ensures the safe and smooth progress of the water drainage work of the water drainage tank, and has high reliability. Description of the Drawings

[0027] The following describes the present invention in detail with reference to the drawings and specific embodiments:

[0028] Figure 1 is a schematic structural diagram of the spherical tank water drainage in the prior art;

[0029] Figure 2 is a schematic structural diagram of the first embodiment of the backwash filter for tank water drainage of the present invention;

[0030] Figure 3 is the above Figure 2 enlarged schematic diagram at A;

[0031] Figure 4 is a schematic structural diagram of the intercepting device (inverted L-shaped baffle) in the first embodiment;

[0032] Figure 5 is the above Figure 2 internal sectional view of the filter body;

[0033] Figure 6 is a schematic structural diagram of the bottom of the filter body;

[0034] Figure 7 is the three-dimensional of the filter bodyFigure 1 ;

[0035] Figure 8 is a three-dimensional view of the filter body Figure 2 ;

[0036] Figure 9 is a schematic structural view of the second embodiment of the backwashing filter for tank water drainage according to the present invention;

[0037] Figure 10 is a schematic structural view of the third embodiment of the backwashing filter for tank water drainage according to the present invention. Detailed implementation manners

[0038] Embodiment 1:

[0039] As Figures 2 to 4 shown, a backwashing filter for tank water drainage according to the present invention includes a settler 4, a filter body 1, and a filter element 2 with a filter screen inside the filter body 1. A scraping device 3 for brushing the filter element 2 is installed on the filter body 1. The inlet of the filter body 1 is connected to the bottom of the settler 4 through a connecting pipe 10. A switching valve 20 is provided on the connecting pipe 10. The top of the settler 4 is connected to the bottom of a spherical tank 5 through a spherical tank outlet pipe 30 and a globe valve 40. The upper side wall of the settler 4 is connected to the top of a water drainage tank 7 through a convection pipe 6. An inlet valve 50 is provided on the convection pipe 6. The spherical tank outlet pipe 30 extends into the settler 4 adjacent to the position of the bottom water outlet of the settler 4. A buffer pipe 8 with a diameter larger than that of the spherical tank outlet pipe 30 is provided inside the settler 4. A first convection port 301 is provided on the side of the spherical tank outlet pipe 30 close to the convection pipe 6. Correspondingly, a second convection port 81 is provided on the opposite side of the buffer pipe 8. The height positions and diameters of the first convection port 301 and the second convection port 81 correspond to the pipe orifice position and diameter of the convection pipe 6. A pipe joint 101 is provided on the side wall of the filter body 1. The upper end of the pipe joint 101 is connected to the convection pipe 6 through a fine filter pipe 100 and is provided with a valve 61. The lower end of the pipe joint 101 is connected to a backwashing water pipe 60 with a valve 61. The settler 4 further includes a blocking device 70 that can block the gas-liquid mixture from flowing into the water drainage tank 7 through the convection pipe 6 when the gas-liquid mixture flows unidirectionally from the spherical tank 5 to the water drainage tank 7. A drainage pipeline 80 is provided at the bottom of the filter body 1.

[0040] As Figures 2 to 4As shown, the intercepting device 70 is a rotatable inverted L-shaped baffle installed inside the settler 4 corresponding to the nozzle position of the convection tube 6. The height of the vertical plate 71 of the inverted L-shaped baffle is greater than the diameter of the nozzle of the convection tube 6, and the weight of the horizontal plate 72 of the inverted L-shaped baffle is greater than that of its vertical plate. In this way, when the ball valve 40 at the bottom of the spherical tank 5 is opened and the high-pressure gas-liquid mixture output from the spherical tank 5 enters the settler 4, under the action of a certain pressure, the inverted L-shaped baffle will rotate around the fulcrum, and its vertical plate 71 will seal the nozzle of the convection tube 6. In this way, it is ensured that the gas-liquid mixture output from the inside of the spherical tank 5 enters the inside of the filter body 1 to complete the filtering work, ensuring the smooth progress of the pre-filtering work before entering the water separation tank 7.

[0041] As Figures 5 to 8 shown, the brushing device 3 includes mounting plates 31 installed at the top and bottom of the filter element 2 inside the filter body 1, a rotating shaft 32 movably connected to the center of the mounting plate 31, and several groups of net brushes 33 with bristles (or several groups of plastic scrapers) fixed on the rotating shaft 32. A driving device 9 for driving the rotation of the rotating shaft 32 is provided at the top of the rotating shaft 32.

[0042] To improve the applicability in different scenarios, the driving device 9 can also be in the following two structural forms:

[0043] The driving device 9 includes a coupling 91 placed at the top of the rotating shaft 32 and a flange 92 installed on the coupling 91. When the filter element 2 does not need to be brushed, the flange 92 is in a locked state. When brushing is required, it is unscrewed and rotated to drive the rotation of the rotating shaft 32, and then drive several groups of net brushes with bristles to brush the filter element 2.

[0044] The drain pipeline 80 is provided with a water seal elbow 801 and a drain valve 802. The water surface height of the water seal elbow 801 entering the drain valve 802 is higher than the plane where the lowest position of the water seal elbow 801 is located. In this way, it effectively prevents the gas inside the filter body 1 from being discharged through the drain pipeline 80 and prevents environmental pollution caused by gas leakage.

[0045] The present invention also discloses an anti-flushing filtration method for the above-mentioned anti-flushing filter for water separation of storage tanks, and its specific steps are:

[0046] (1) Open the ball valve 40 at the bottom of the spherical tank 5. The gas-liquid mixture inside the spherical tank 5 enters the settler 4 in sequence. The pressure inside the settler 4 is relatively high, and the intercepting device 70 starts to work. The nozzle at the settler 4 end of the convection tube 6 is closed. The gas-liquid mixture enters the filter body 1 through the bottom outlet of the settler 4. After passing through the filter body 1 for filtration in sequence, it then flows unidirectionally into the inside of the water separation tank 7 through the filter fine tube 100 and the convection tube 6. At this time, the impurities in the gas-liquid mixture will settle to the bottom of the filter body 1;

[0047] (2) When the pressures of the settler 4 and the water knockout drum 7 are balanced, the intercepting device 70 opens, and the passage of the spherical tank 5 - settler 4 - convection pipe 6 - water knockout drum 7 is connected. After the liquid hydrocarbon enters the settler 4 through the convection pipe 6, it flows back into the spherical tank 5 for the recovery of the liquid hydrocarbon. At this time, the impurities in the gas-liquid mixture will settle to the bottom of the settler 4;

[0048] (3) Close the ball valve 40 and the inlet valve 50, and the water knockout drum 7 performs the dehydration operation. After all the water in the water knockout drum 7 is removed, open the inlet valve 50 and the ball valve 40. At this time, due to the pressure difference, the gas-liquid mixture flows from the spherical tank 5 through the settler 4 to the water knockout drum 7. Close the intercepting device 70, and the mixture can only flow through the filter and then through the filter fine pipe 100 into the water knockout drum 7 until the pressure is balanced, and this process is repeated multiple times;

[0049] (4) When it is necessary to scrape and wash the filter, close the inlet valve 50, the ball valve 40, and the switch valve 20, open the valve 61, connect the backwash water pipe 60, fill the inside of the filter body 1 with water, start the scraping device 3 to scrape and wash the filter screen of the filter element 2, and the sewage after washing is discharged through the drain pipe 80.

[0050] For the filter described in the present invention, during the stage when the pressures of the spherical tank 5 and the water knockout drum 7 are balanced before the water knockout drum 7 performs the water knockout operation, the intercepting device 70 opens, and the liquid passage is the spherical tank - 5 settler 4 - convection pipe 6 - water knockout drum 7. The liquid hydrocarbon and water can be separated by convection, and the impurities in the settler 4 can be settled in time, avoiding the inconvenience of cleaning and potential safety hazards caused by the impurities entering the inside of the water knockout drum 7.

[0051] In addition, after the water knockout drum 7 performs the water knockout operation, the pressure in the water knockout drum 7 is much lower than that of the spherical tank 5. At this time, the mixture will flow unidirectionally to the water knockout drum 7. The intercepting device 70 cuts off the passage between the settler 4 and the convection pipe 6, and the mixture can only flow through the filter and then through the filter fine pipe 100 into the water knockout drum 7 until the unidirectional flow ends. Then the intercepting device 70 opens to enter the convection stage, avoiding the impurities entering the water knockout drum due to insufficient settlement during the unidirectional flow stage. The process is simple and convenient, safe and reliable.

[0052] Embodiment 2:

[0053] This embodiment is basically the same as the above Embodiment 1, and the difference lies in that: as Figure 9As shown, the cut-off device 50 is an inlet solenoid valve installed on the convection pipe 6. When the gas-liquid mixture flows from the spherical tank 5 into the water-cutting tank 7, the inlet valve 50 is closed and the filter solenoid valve is opened, which ensures that when the gas-liquid mixture flows from the spherical tank 5 to the water-cutting tank 7, it must pass through the inside of the filter body 1, is filtered by the filter element 2, and then flows unidirectionally into the inside of the water-cutting tank 7 through the filter fine pipe 100 and the convection pipe 6. The use of this solenoid valve improves the reliability even more.

[0054] In this embodiment, the working principle of the filter and the reverse flushing process are the same as those in the first embodiment above, and will not be elaborated here.

[0055] Embodiment Three:

[0056] This embodiment is basically the same as the structure of the second embodiment above, and the difference lies in that: as Figure 10 shown, the driving device 9' is a rotary handle installed on the top of the rotating shaft 32, which is convenient to operate.

[0057] The present invention is not limited to the above embodiments. Any modifications or variations of the present invention that do not depart from the spirit and scope of the present invention, provided that these modifications and variations are within the scope of the claims of the present invention and equivalent technical scope, then the present invention also means including these modifications and variations.

Claims

1. A backwash filter for cutting water from a storage tank, characterized in that: The utility model comprises a settler, a filter body and a filter element with a filter screen inside the filter body, a scraping brush device for brushing the filter element is installed on the filter body, the inlet of the filter body is connected to the bottom of the settler through a connecting pipe, the connecting pipe is provided with a switch valve, the top of the settler is connected with the bottom of the spherical tank through a spherical tank outlet pipe and a ball valve, the upper side wall of the settler is connected with the top of the water cutting tank through a convection pipe, an inlet valve is provided on the convection pipe, the spherical tank outlet pipe extends into the settler to the position of the water outlet near the lower part of the settler, the upper water outlet of the settler is connected to the convection pipe, the side wall of the filter body is provided with a pipe joint, the outlet of the filter body is connected with the convection pipe through a filtering capillary and a valve is connected, the lower end of the pipe joint is connected to a backwashing water pipe with a valve, the settler also comprises a cut-off device which can cut off the gas-liquid mixture from entering the water cutting tank through the convection pipeline when the gas-liquid mixture flows from the spherical tank to the water cutting tank in one direction, and a drainage pipeline is provided at the bottom of the filter body.

2. The backwash filter for cutting off water from a storage tank according to claim 1, characterized in that: The intercepting device is a rotatable inverted L-shaped baffle installed inside the sedimentation chamber corresponding to the position of the convection pipe orifice, wherein the height of the vertical plate of the inverted L-shaped baffle is greater than the diameter of the convection pipe orifice, and the weight of the horizontal plate of the inverted L-shaped baffle is greater than the weight of the vertical plate.

3. The backwash filter for cutting off water from a storage tank according to claim 1, characterized in that: The intercepting device is a solenoid valve installed at the inlet of the convection pipe, and the solenoid valve is closed when the gas-liquid mixture flows from the spherical tank to the water cutting tank in one direction.

4. The backwash filter for cutting off water from a storage tank according to any one of claims 1 to 3, characterized in that: The scraping and brushing device includes mounting plates installed at the bottom and top of the filter element in the filter body, a rotating shaft movably connected to the center of the mounting plate, and several groups of mesh brushes with bristles or several groups of plastic scrapers fixed on the rotating shaft. A driving device for driving the rotating shaft to rotate is provided on the top of the rotating shaft.

5. The backwash filter for cutting off water from a storage tank according to claim 4, characterized in that: The driving device comprises a coupling placed on the top of the rotating shaft and a flange handle mounted on the coupling.

6. The backwash filter for cutting off water from a storage tank according to claim 4, characterized in that: The driving device is a rotating handle installed on the top of the rotating shaft.

7. The backwash filter for cutting off water from a storage tank according to claim 1, characterized in that: The drainage pipeline is provided with a water seal elbow and a drainage valve. The water level of the water seal elbow entering the outlet valve is higher than the plane where the lowest position of the water seal elbow is located.

8. The backwash filter for cutting off water from a storage tank according to claim 1, characterized in that: A buffer tube with a diameter larger than that of the spherical tank outlet pipe is provided inside the settler. The spherical tank outlet pipe is provided with a first convection port close to the convection tube side. Correspondingly, the buffer tube is provided with a second convection port on the opposite side. The height positions of the first and second convection ports correspond to the pipe port position and caliber of the convection tube.

9. A filtering method for a backwash filter for cutting off water from a storage tank according to any one of claims 1 to 8, wherein the specific steps are: (1) Open the ball valve at the bottom of the spherical tank, and the gas-liquid mixture inside the spherical tank enters the settler in turn. At this time, the internal pressure of the settler is relatively high, the intercepting device starts working, and the convection tube is closed. At this time, the gas-liquid mixture flows into the filter through the bottom outlet of the settler, and is filtered by the filter body in turn, and then flows into the water cut tank in a unidirectional manner through the filter capillary and the convection tube. At this time, the impurities in the gas-liquid mixture will settle to the bottom of the filter body; (2) When the pressure of the settler and the water cut-off tank is balanced, the intercepting device is opened, and the passage of the spherical tank-settler-convection pipe-water cut-off tank is connected. After the liquid hydrocarbon enters the settler through the convection pipe, it flows back to the spherical tank for liquid hydrocarbon recovery. At this time, the impurities in the gas-liquid mixture will settle to the bottom of the settler; (3) Close the bulb valve and the inlet valve, and the water cut-off tank starts dehydration. When all the water in the water cut-off tank is removed, open the inlet valve and the bulb valve. At this time, due to the pressure difference, the mixture flows from the ball tank through the settler to the water cut-off tank. Close the interception device, and the mixture can only be filtered through the filter and then flow into the water cut-off tank through the capillary until the pressure is balanced. Repeat this cycle for multiple times. (4) When the filter needs to be flushed, close the inlet valve, bulb valve, and switch valve, open the valve, connect the backwash water pipe, fill the filter body with water, start the scraping device to scrape and flush the filter screen of the filter element, and the sewage after flushing is discharged through the drainage pipe.

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