Backwash filter for water cutting of storage tank

Abstract

The utility model belongs to the technical field of filters, and particularly discloses a backwashing filter for water cutting 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 upper side wall of the settler is communicated with the top of a water cutting 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] This utility model belongs to the technical field of filter products, and specifically discloses a backwash filter for cutting water from storage tanks. Background Technology

[0002] In existing technologies, such as Figure 1 As shown, a certain amount of water will accumulate at the bottom of the spherical tank 1' storing liquefied hydrocarbons. Before using the liquefied hydrocarbons, a water-cutting tank 2' needs to be connected to the bottom of the spherical tank 1'. After opening the bulb valve 3' at the bottom of the spherical tank 1' and the inlet valve 4' before entering the water-cutting tank 2', the liquefied hydrocarbons containing water are transported to the water-cutting tank 2'. Then, the bulb valve 3' and the inlet valve 4' are closed, and the water-cutting tank 2' starts the water-cutting process. When the water in the water-cutting tank 2' is completely discharged (monitored by the level gauge 5'), the inside of the water-cutting tank 2' is full of liquefied hydrocarbons. Then, the inlet valve 4' and the bulb valve 3' are opened to recover the liquefied hydrocarbons inside the water-cutting tank 2' back into the spherical tank 1'. At this time, the pressure inside the water-cutting tank 2' is lower than that in the spherical tank 1'. At the moment the inlet valve 4' is opened, the pressure difference on both sides causes the water-cutting tank 2' to vibrate, which seriously affects the performance and service life of the water-cutting tank 2' and greatly reduces its safety and reliability.

[0003] In addition, rust or powder and other impurities will accumulate at the bottom of the spherical tank 1'. When water cutting is performed, the impurities will enter the water cutting tank 2' with the water. In order to improve the water cutting effect, the water cutting tank 2' needs to be cleaned regularly. Usually, when cleaning the water cutting tank 2', all the liquefied hydrocarbons in the water cutting tank 2' must be drained before cleaning. The cleaning process is extremely tedious and troublesome. Moreover, when the water cutting tank 2' is put into use again after cleaning, it must be completely filled with water beforehand to prevent air from entering, then connected to the spherical tank 1', and then the water drained to avoid the potential safety hazard caused by air accidentally entering the spherical tank 1'.

[0004] To address the problem of inconvenient cleaning of the water-cutting tank 2' caused by impurities, an online-washable filter was installed at the inlet of the water-cutting tank. However, commonly used ordinary filters are not suitable. Once the filter is clogged, water in the spherical tank 1' can no longer enter the water-cutting tank 2', and liquefied hydrocarbons in the water-cutting tank 2' cannot return to the interior of the spherical tank 1'. At this time, the spherical tank 1' and the water-cutting tank 2' are in a state of isolation, which cannot guarantee the smooth operation of the water-cutting work and affects the water-cutting effect.

[0005] Therefore, it is urgent to study a backwash filter for tank water cutting that can perform backwashing and ensure the safe and smooth operation of water cutting, as well as the water cutting system and method using the filter. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of the prior art, specifically a backwash filter for tank water cutting. This filter ensures that before the material in the spherical tank enters the water cutting tank for water cutting, liquid hydrocarbons and water can be separated by convection, allowing impurities to settle in time. This avoids the inconvenience and safety hazards caused by impurities entering the water cutting tank. At the same time, after water cutting, the mixture can only pass through the filter in one direction and then flow into the water cutting tank through the filter tube until the one-way flow ends. The interception device then opens to enter the convection stage, preventing impurities from entering the water cutting tank due to insufficient settling during the one-way flow stage. The process is simple, convenient, safe and reliable.

[0007] To achieve the above-mentioned technical objectives, this utility model is implemented according to the following technical solution:

[0008] This utility model discloses a backwash filter for water cutting in storage tanks, comprising a settling tank, a filter body, and a filter element with a filter screen inside the filter body. The filter body is equipped with a scraper device for washing the filter element. The inlet of the filter body is connected to the bottom of the settling tank via a connecting pipe, and the connecting pipe is equipped with a switch valve. The top of the settling tank is connected to the bottom of the spherical tank via a spherical tank outlet pipe and a ball valve. The upper sidewall of the settling tank is connected to the top of the water cutting tank via a convection pipe, and the convection pipe is equipped with an inlet valve. The outlet pipe of the spherical tank extends into the interior of the settling tank near the bottom outlet. The upper outlet of the settling tank is connected to a convection pipe. The side wall of the filter body is equipped with a pipe joint. The outlet of the filter body is connected to the convection pipe through a filter tube and is connected to a valve. The lower end of the pipe joint is connected to a backwash water pipe with a valve. The settling tank also includes a flow interceptor that can cut off the gas-liquid mixture from entering the water-cutting tank through the convection pipe when the gas-liquid mixture flows unidirectionally from the spherical tank to the water-cutting tank. The bottom of the filter body is equipped with a drain pipe.

[0009] In this invention, the flow-blocking device can be implemented in the following two structural forms:

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

[0011] The second type is installed at the inlet solenoid valve of the convection pipe, which closes when the gas-liquid mixture flows unidirectionally from the spherical tank to the water-cutting tank.

[0012] As a further improvement to the above technology, the scraping device includes a mounting plate 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 sets of mesh brushes with bristles or several sets of plastic scrapers fixed on the rotating shaft. The top of the rotating shaft is provided with a driving device to drive the rotating shaft to rotate.

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

[0014] The first type of drive device includes a coupling located at the top of the rotating shaft and a flange handle mounted on the coupling.

[0015] The second type is a rotating handle mounted on the top of the rotating shaft.

[0016] As a further improvement to the above technology, the drainage pipe is equipped with a water seal bend and a drain valve. The water level at the water seal bend entering the outlet valve is higher than the plane where the lowest point of the water seal bend is located, which effectively prevents the gas inside the filter body from being discharged from the drainage pipe.

[0017] As a further improvement to the above technology, in order to extend the flow path and facilitate the settling of impurities, the settling device is provided with a buffer pipe with a diameter larger than that of the spherical tank outlet pipe. The spherical tank outlet pipe is provided with a first convection port on the side near the convection pipe, and correspondingly, the buffer pipe is provided with a second convection port on the opposite side. The height positions of the first and second convection ports correspond to the position and diameter of the convection pipe opening.

[0018] This utility model also discloses a backwashing filtration method for the aforementioned backwashing filter used for water cutting in storage tanks, the specific steps of which are as follows:

[0019] (1) Open the ball valve at the bottom of the ball tank. The gas-liquid mixture inside the ball tank enters the settling tank in sequence. At this time, the pressure inside the settling tank is relatively high. The flow interception device starts working and the convection pipe is closed. At this time, the gas-liquid mixture flows into the filter through the bottom outlet of the settling tank. After passing through the filter body in sequence, it passes through the filter tube and the convection pipe and then flows into the water cutting tank in one direction. At this time, the impurities in the gas-liquid mixture will settle to the bottom of the filter body.

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

[0021] (3) Close the bulb valve and the inlet valve, and the water cutter tank will carry out dehydration. After all the water in the water cutter 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 to the water cutter tank through the settler. Close the interception device. The mixture can only be filtered through the filter and then flow into the water cutter tank through the thin pipe until the pressure is balanced. Repeat this process multiple times.

[0022] (4) When it is necessary to scrape and rinse the filter, close the inlet valve, the bulb valve, and the switch valve, open the valve, connect the backwash water pipe, fill the filter body with water, start the scraping device to scrape and rinse the filter screen of the filter element, and discharge the wastewater after rinsing through the drain pipe.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] (1) The backwash filter for tank water cutting described in this utility model can allow the gas-liquid mixture to enter the filter body in one direction from the spherical tank to the water cutting tank for filtration, so as to timely and effectively settle, filter and recover the impurities in the mixture; when the pressure is balanced, the spherical tank-sedimentator-convection pipe-water cutting tank passage is connected, and the water and liquid hydrocarbons in the mixture can be separated by convection, and the liquid hydrocarbons can be recovered smoothly without being affected by the filter.

[0025] (2) The backwash filter for tank water cutting described in this utility model can complete backwashing well. When the valve is opened and the connecting water pipe is connected, water enters the filter body and the filter element is thoroughly cleaned and cleaned by the mesh brush, which effectively improves the service life of the valve core and ensures the filtration effect of the filter.

[0026] (3) The backwash filter for water cutting of the storage tank described in this utility model ensures the safe and smooth operation of water cutting in the water cutting tank and has high reliability. Attached Figure Description

[0027] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0028] Figure 1 This is a schematic diagram of the structure of a spherical tank during water cutting in the prior art;

[0029] Figure 2 This is a schematic diagram of the structure of a backwash filter for tank water cutting according to a first embodiment of the present invention;

[0030] Figure 3 The above Figure 2 Enlarged view of point A in the middle;

[0031] Figure 4 This is a schematic diagram of the flow-blocking device (inverted L-shaped baffle) in Embodiment 1.

[0032] Figure 5 The above Figure 2 Internal sectional view of the filter body;

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

[0034] Figure 7It is a three-dimensional filter body Figure 1 ;

[0035] Figure 8 It is a three-dimensional filter body Figure 2 ;

[0036] Figure 9 This is a schematic diagram of the structure of Embodiment 2 of the backwash filter for tank water cutting according to this utility model;

[0037] Figure 10 This is a schematic diagram of the structure of Embodiment 3 of the backwash filter for tank water cutting according to this utility model. Detailed Implementation

[0038] Example 1:

[0039] like Figures 2 to 4 As shown, the present invention discloses a backwash filter for tank water cutting, comprising a settling tank 4, a filter body 1, and a filter element 2 with a filter screen inside the filter body 1. A scraper 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 settling tank 4 via a connecting pipe 10, which is equipped with a switch valve 20. The top of the settling tank 4 is connected to the bottom of a spherical tank 5 via a spherical tank outlet pipe 30 and a bulb valve 40. The upper sidewall of the settling tank 4 is connected to the top of a water cutting tank 7 via a convection pipe 6, which is equipped with an inlet valve 50. The spherical tank outlet pipe 30 extends into the settling tank 4 near the bottom outlet. The settling tank 4 has a diameter larger than that of the spherical tank outlet pipe 30. The filter body 1 has a buffer pipe 8. The spherical tank outlet pipe 30 is provided with a first convection port 301 near the convection pipe 6. Correspondingly, the buffer pipe 8 is provided with a second convection port 81 on the opposite side. The height of the first convection port 301 and the second convection port 81 correspond to the position and diameter of the convection pipe 6. The side wall of the filter body 1 is provided with a pipe joint 101. The upper end of the pipe joint 101 is connected to the convection pipe 6 through a filter tube 100 and is connected with a valve 61. The lower end of the pipe joint 101 is connected to a backwash water pipe 60 with a valve 61. The sedimentation tank 4 also includes a flow interceptor 70 that can cut off the gas-liquid mixture from flowing unidirectionally from the spherical tank 5 into the water cutting tank 7 through the convection pipe 6 and prevent it from entering the water cutting tank 7. The bottom of the filter body 1 is provided with a drain pipe 80.

[0040] like Figures 2 to 4As shown, the flow interception device 70 is a rotatable inverted L-shaped baffle installed inside the settling tank 4, corresponding to the position of the convection pipe 6 opening. The height of the vertical plate 71 of the inverted L-shaped baffle is greater than the diameter of the convection pipe 6 opening, and the weight of the horizontal plate 72 of the inverted L-shaped baffle is greater than the weight of its vertical plate. Thus, when the bulb valve 40 at the bottom of the spherical tank 5 is opened, the high-pressure gas-liquid mixture output from the spherical tank 5 enters the settling tank 4. Under a certain pressure, the inverted L-shaped baffle will rotate around the fulcrum, and its vertical plate 71 will seal the opening of the convection pipe 6. This ensures that the gas-liquid mixture output from the spherical tank 5 enters the filter body 1 to complete the filtration work, ensuring the smooth progress of the pre-filtration work before entering the water-cutting tank 7.

[0041] like Figures 5 to 8 As shown, the scraping device 3 includes a mounting plate 31 installed on 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 sets of brushes 33 (or several sets of plastic scrapers) with bristles fixed on the rotating shaft 32. The top of the rotating shaft 32 is provided with a driving device 9 for driving the rotating shaft 32 to rotate.

[0042] To improve applicability to different scenarios, the drive device 9 can also have the following two structural forms:

[0043] The drive device 9 includes a coupling 91 placed on 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, thereby driving the rotating shaft 32 to rotate, and then driving several sets of brushes with bristles to brush the filter element 2.

[0044] The drainage pipe 80 is equipped with a water seal bend 801 and a drain valve 802. The water level at which the water seal bend 801 enters the drain valve 802 is higher than the plane where the lowest point of the water seal bend 801 is located. This effectively prevents the gas inside the filter body 1 from being discharged from the drainage pipe 80, thus preventing gas leakage from causing environmental pollution.

[0045] This utility model also discloses a backwashing filtration method for the aforementioned backwashing filter used for water cutting in storage tanks, the specific steps of which are as follows:

[0046] (1) Open the bulb valve 40 at the bottom of the spherical tank 5. The gas-liquid mixture inside the spherical tank 5 enters the settling tank 4 in sequence. The pressure inside the settling tank 4 is relatively high. The flow interceptor 70 starts working. The end port of the settling tank 4 of the convection pipe 6 is closed. The gas-liquid mixture enters the filter body 1 through the bottom outlet of the settling tank 4. After being filtered by the filter body 1 in sequence, it flows into the interior of the water-cutting tank 7 in one direction after passing through the filter tube 100 and the convection pipe 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 pressure of the settling tank 4 and the water-cutting tank 7 is balanced, the interception device 70 is opened, and the passage of the ball tank 5-settling tank 4-convection pipe 6-water-cutting tank 7 is connected. After the liquid hydrocarbon enters the settling tank 4 through the convection pipe 6, it flows back to the ball tank 5 for liquid hydrocarbon recovery. At this time, the impurities of the gas-liquid mixture will settle to the bottom of the settling tank 4.

[0048] (3) Close the bulb valve 40 and the inlet valve 50. The water tank 7 will carry out dehydration. After all the water in the water tank 7 is removed, open the inlet valve 50 and the bulb valve 40. At this time, due to the pressure difference, the gas-liquid mixture flows from the ball tank 5 through the sedimentation device 4 to the water tank 7. Close the interception device 70. The mixture can only be filtered through the filter and then flow into the water tank 7 through the filter tube 100 until the pressure is balanced. Repeat this process multiple times.

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

[0050] The filter described in this utility model ensures that before the water cutting tank 7 performs water cutting operations, the pressure of the spherical tank 5 and the water cutting tank 7 is balanced. The interception device 70 is opened, and the liquid passage is spherical tank - 5 settling tank 4 - convection pipe 6 - water cutting tank 7. Liquid hydrocarbons and water can be separated by convection, and impurities in the settling tank 4 can be settled in time, avoiding the inconvenience of cleaning and safety hazards caused by impurities entering the water cutting tank 7.

[0051] Furthermore, after the water is cut off in the water-cutting tank 7, the pressure inside the water-cutting tank 7 is much lower than that in the spherical tank 5. At this time, the mixture will flow unidirectionally to the water-cutting tank 7. The intercepting device 70 cuts off the passage between the settling device 4 and the convection pipe 6. The mixture can only flow into the water-cutting tank 7 through the filter and then through the filter tube 100 until the unidirectional flow ends. The intercepting device 70 is then opened to enter the convection stage, which avoids impurities from entering the water-cutting tank due to insufficient settling during the unidirectional flow stage. The process is simple, convenient, safe and reliable.

[0052] Example 2:

[0053] This embodiment has a basically the same structure as Embodiment 1 above, except that: Figure 9As shown, the interception 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. This ensures that when the gas-liquid mixture flows from the spherical tank 5 to the water-cutting tank 7, it must pass through the interior of the filter body 1, be filtered by the filter element 2, and then flow unidirectionally into the interior of the water-cutting tank 7 after passing through the filter tube 100 and the convection pipe 6. The use of this solenoid valve further improves reliability.

[0054] In this embodiment, the working principle of the filter and the backwashing process are the same as in Embodiment 1 above, and will not be repeated here.

[0055] Example 3:

[0056] This embodiment has a basically the same structure as Embodiment 2 above, except that: Figure 10 As shown, the driving device 9' is a rotary handle mounted on the top of the rotating shaft 32, which is easy to operate.

[0057] This utility model is not limited to the above-described embodiments. Any modifications or variations to this utility model that do not depart from the spirit and scope of this utility model, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this utility model, then this utility model also includes such modifications and variations.

Claims

1. A backwash filter for tank water cutting, characterized in that: The filter includes a settling tank, a filter body, and a filter element with a filter screen inside the filter body. The filter body is equipped with a scraper device for washing the filter element. The inlet of the filter body is connected to the bottom of the settling tank via a connecting pipe, and the connecting pipe is equipped with a switch valve. The top of the settling tank is connected to the bottom of the spherical tank via a spherical tank outlet pipe and a ball valve. The upper side wall of the settling tank is connected to the top of the cut-off tank via a convection pipe, and the convection pipe is equipped with an inlet valve. The spherical tank outlet pipe extends into the settling tank near the bottom outlet of the settling tank. The upper outlet of the settling tank is connected to the convection pipe. The side wall of the filter body is equipped with a pipe joint. The outlet of the filter body is connected to the convection pipe via a filter tube and is connected to a valve. The lower end of the pipe joint is connected to a backwash water pipe with a valve. The settling tank also includes a flow-blocking device that can cut off the gas-liquid mixture from flowing unidirectionally from the spherical tank to the cut-off tank through the convection pipe into the cut-off tank. The bottom of the filter body is equipped with a drain pipe.

2. The backwash filter for tank water cutting according to claim 1, characterized in that: The flow-blocking device is a rotatable inverted L-shaped baffle installed inside the settling chamber, corresponding to the position of the convection pipe opening. The height of the vertical plate of the inverted L-shaped baffle is greater than the diameter of the convection pipe opening, 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 tank water cutting according to claim 1, characterized in that: The flow-stopping device is a solenoid valve installed at the inlet of the convection pipe. The solenoid valve is closed when the gas-liquid mixture flows unidirectionally from the spherical tank to the water-cutting tank.

4. The backwash filter for tank water cutting according to any one of claims 1 to 3, characterized in that: The scraping device includes a mounting plate 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 sets of brushes with bristles or several sets of plastic scrapers fixed on the rotating shaft. The top of the rotating shaft is provided with a drive device to drive the rotating shaft to rotate.

5. The backwash filter for tank water cutting according to claim 4, characterized in that: The drive unit includes a coupling located at the top of the rotating shaft and a flange handle mounted on the coupling.

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

7. The backwash filter for tank water cutting according to claim 1, characterized in that: The drainage pipeline is equipped with a water seal bend and a drain valve. The water level at which the water seal bend enters the outlet valve is higher than the plane where the lowest point of the water seal bend is located.

8. The backwash filter for tank water cutting according to claim 1, characterized in that: The settling device is equipped with a buffer pipe with a diameter larger than that of the spherical tank outlet pipe. The spherical tank outlet pipe is provided with a first convection port on the side near the convection pipe. Correspondingly, the buffer pipe is provided with a second convection port on the opposite side. The height of the first and second convection ports corresponds to the position and diameter of the convection pipe opening.

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