Dual filter media filter and method of use

Abstract

The application discloses a double-filtering-material filter and a use method, and belongs to the technical field of filtering equipment. The filter comprises a shell, a nitrogen inlet at the upper portion of the shell, and a hydrocarbon liquid collecting port. Nitrogen is first introduced into the filter to push the hydrocarbon liquid to be separated by centrifugal fluid. The medium passes through the centrifugal fluid to separate dirt. The nitrogen is introduced first to play a role of safety protection and replacement. The nitrogen is gathered in the middle due to the centrifugal action and generates upward airflow to disturb the filter material. The filter material in the filter is loosened, the intercepted substances adhered to the surface of the filter material are stripped and carried away by subsequent backwashing water flow, the sludge and suspended matters in the filter layer are beneficially removed, the filter material is prevented from being hardened, the interception capacity of the filter material is fully recovered, and the cleaning purpose is achieved. The hydrocarbon liquid collecting port is arranged, so that the hydrocarbon liquid can directly enter an oil collecting tank without entering a receiving water tank, energy saving and safety are achieved, cleaning is facilitated, and manpower and time are saved.

Description

Technical Field

[0001] This invention belongs to the field of filtration equipment technology, specifically relating to a dual-media filter and its usage method. Background Technology

[0002] The dual-media filter is a device suitable for water treatment in oil and gas fields, as well as sewage and wastewater treatment. The filter bed uses two different filter media: a pebble pad and a layer of quartz sand, etc. A suitable gradation is selected according to different operating conditions to maximize the interception capacity and control of solid particles in the water under different specific gravities, materials, and particle sizes. This distribution is close to an ideal filter bed. Because the upper layer of filter media has larger gaps between particles, while the lower layer has smaller gaps, the layered configuration better utilizes the overall adsorption and filtration capacity of the filter bed.

[0003] Currently, in the workplace, traditional dual-media filters tend to form a layer of high-concentration hydrocarbon liquid on top of the filter media. The traditional process involves backwashing with water using a backwash pump to the receiving tank, and then overflowing the oil from the top of the receiving tank to the oil collection tank. This is unsafe, energy-inefficient, time-consuming, and labor-intensive. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-media filter and its usage method to solve the technical problems of existing dual-media filters, which involve backwashing with water from a backwash pump to a receiving tank, and then overflowing oil from the top of the receiving tank to an oil collection tank, which is unsafe, energy-inefficient, time-consuming, and labor-intensive.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A dual-media filter includes a housing with an inlet at the upper end and an outlet at the lower end. Filter media is disposed inside the housing, and a spiral guide rail is inclinedly disposed above the filter media. The spiral guide rail has two through holes tangentially to each other along the housing. One through hole is connected to a nitrogen inlet, and the other through hole is connected to a hydrocarbon liquid collection port.

[0007] Preferably, filters are provided at both the inlet and outlet.

[0008] Preferably, a grid is provided below the filter material for support, and a filter screen is provided above it. Both the grid and the filter screen are fixed to the inner wall of the housing.

[0009] Preferably, the spiral guide rail is a radially open groove structure, which is fixed on the inner wall of the housing, and two through holes are opened at both ends of the spiral guide rail along the tangential direction of the housing.

[0010] Preferably, the hydrocarbon liquid receiving port side of the spiral guide rail is inclined downwards at an angle of 10 to 20 degrees.

[0011] Preferably, a nitrogen inlet valve is provided at the nitrogen inlet; a nitrogen pressure gauge is provided behind the nitrogen inlet valve.

[0012] Preferably, a hydrocarbon liquid receiving port valve is provided at the hydrocarbon liquid receiving port.

[0013] A method of using a dual-media filter includes:

[0014] S1: Open the nitrogen inlet and introduce nitrogen to the preset pressure range;

[0015] S2: Open the hydrocarbon liquid receiving port to allow the hydrocarbon liquid to enter the oil receiving tank directly. Observe the liquid level in the oil receiving tank. When the liquid level in the oil receiving tank no longer rises, close the hydrocarbon liquid receiving port.

[0016] S3: Clean the dual-media filter.

[0017] Preferably, the preset gas pressure range is 0.2MPa to 0.4MPa; and a nitrogen inlet valve is provided at the nitrogen inlet; a nitrogen pressure gauge is provided behind the nitrogen inlet valve; a hydrocarbon liquid receiving port valve is provided at the hydrocarbon liquid receiving port; both the nitrogen inlet valve and the hydrocarbon liquid receiving port valve are controlled manually or automatically.

[0018] Preferably, the cleaning dual-media filter specifically includes:

[0019] S301: Remove trapped material adhering to the surface of the filter media;

[0020] S302: Backwash water enters from the outlet and exits from the inlet to rinse the filter.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This application discloses a dual-media filter. The filter housing has an inlet at the upper end and an outlet at the lower end. Filter media is placed inside the housing, and a spiral guide rail is inclined above the filter media. Two through holes are tangentially formed along the housing. One through hole connects to a nitrogen inlet, and the other connects to a hydrocarbon liquid collection port. Nitrogen gas is introduced through the nitrogen inlet at the upper part of the housing to drive the hydrocarbon liquid through cyclone separation. The hydrocarbon liquid collection port collects the liquid. The medium separates contaminants through cyclone separation. The initial introduction of nitrogen gas serves as a safety protection and displacement mechanism. Due to the cyclone separation, the nitrogen gas accumulates in the middle and generates an upward airflow that disturbs the filter media. This loosens the filter media, allowing contaminants adhering to the surface to be peeled off and carried away by the subsequent backwash water flow. This facilitates the removal of sediment and suspended solids from the filter layer and prevents the filter media from caking, fully restoring its contaminant-catching capacity and achieving the cleaning purpose. The hydrocarbon liquid collection port allows the hydrocarbon liquid to directly enter the oil collection tank without entering the receiving water tank, saving energy, safety, and cleaning time and manpower. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a first-view structural schematic diagram of a dual-media filter provided in an embodiment of the present invention;

[0025] Figure 2 This is a second-view structural schematic diagram of a dual-media filter provided in an embodiment of the present invention;

[0026] Figure 3 This is a first-view schematic diagram of another structure of a dual-media filter provided in an embodiment of the present invention.

[0027] Wherein: 1-Inlet; 2-Outlet; 3-Filter media; 4-Spiral guide rail; 5-Nitrogen inlet; 6-Hydrocarbon liquid collection port; 7-Upward airflow; 8-Shell; 9-Hydrocarbon liquid; 10-Center-shaped open trough structure; 11-Subsequent backwash water flow; 12-Nitrogen inlet valve; 13-Nitrogen pressure gauge; 14-Hydrocarbon liquid collection port valve. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings:

[0035] See Figure 1 This application discloses a dual-media filter, including a housing 8. The housing 8 has an inlet 1 at the upper end and an outlet 2 at the lower end. Filter media 3 is disposed inside the housing 8. A spiral guide rail 4 is inclinedly disposed above the filter media 3. The spiral guide rail 4 has two through holes tangentially along the housing 8. One through hole is connected to a nitrogen inlet 5, and the other through hole is connected to a hydrocarbon liquid collection port 6. Nitrogen gas is first introduced from the nitrogen inlet 5 at the upper part of the housing 8 to drive the hydrocarbon liquid 9 to rotate and separate. The hydrocarbon liquid collection port 6 collects the liquid. The hydrocarbon liquid collection port 6 allows the hydrocarbon liquid to directly enter the oil receiving tank without entering the receiving water tank.

[0036] How to use:

[0037] S1: Open nitrogen inlet 5 and introduce nitrogen to the preset pressure range;

[0038] S2: Open the hydrocarbon liquid receiving port 6 to allow the hydrocarbon liquid 9 to enter the oil receiving tank directly. Observe the liquid level in the oil receiving tank. When the liquid level in the oil receiving tank no longer rises, close the hydrocarbon liquid receiving port 6.

[0039] S3: Clean the dual-media filter to fully restore its dirt-trapping capacity, thereby achieving the purpose of cleaning.

[0040] Nitrogen gas is introduced through nitrogen inlet 5 at the top of the casing to drive the hydrocarbon liquid vortex separation. Hydrocarbon liquid collection port 6 collects the liquid. The medium separates contaminants through rotating fluid. The initial nitrogen gas acts as a safety protection mechanism, acting as a displacement agent. Due to the vortex effect, the nitrogen gas accumulates in the middle, generating an upward airflow that disturbs the filter media. This loosens the filter media, allowing contaminants adhering to its surface to peel off and be carried away by the subsequent backwash water flow. This facilitates the removal of sediment and suspended solids from the filter layer and prevents the filter media from caking, fully restoring its contaminant-catching capacity and achieving the cleaning purpose. The hydrocarbon liquid collection port allows the hydrocarbon liquid to directly enter the oil collection tank, bypassing the receiving water tank, thus saving energy, ensuring safety, facilitating cleaning, and reducing manpower and time.

[0041] In some embodiments, the housing 8 has an inlet 1 on one side and an outlet 2 on the other side, and both the inlet 1 and the outlet 2 have filters.

[0042] In some embodiments, a nitrogen inlet valve 12 is provided at the nitrogen inlet 5; a nitrogen pressure gauge 13 is provided behind the nitrogen inlet valve 12; and a hydrocarbon liquid receiving port valve 14 is provided at the hydrocarbon liquid receiving port 6.

[0043] How to use:

[0044] S1: Nitrogen is introduced into the nitrogen inlet 5 for cleaning. Nitrogen is introduced first to drive the hydrocarbon liquid 9 to separate by vortexing. The hydrocarbon liquid is collected at the liquid collection port 6. The medium separates the dirt through the rotating fluid. The introduction of nitrogen first plays a role in the replacement of safety protection. Due to the vortexing effect, the nitrogen gathers in the middle and generates an upward airflow 7 to disturb the filter media 3.

[0045] S2: First, open the nitrogen inlet valve 12 to introduce nitrogen. Observe the nitrogen pressure gauge 13. When it reaches 0.2MPa to 0.4MPa, close the nitrogen inlet valve 12. Open the hydrocarbon liquid receiving port valve 14 to allow the hydrocarbon liquid 9 to directly enter the oil receiving tank. Observe the liquid level in the oil receiving tank. When it no longer rises, close the hydrocarbon liquid receiving port valve 14.

[0046] S3: Loosen the filter media 3 inside the filter, so that the intercepted material adhering to the surface of the filter media 3 can be peeled off and carried away by the subsequent backwash water flow 11. The subsequent backwash water flow 11 enters from the outlet 2 and exits from the inlet 1 to the receiving water tank. This is beneficial for removing sediment, suspended solids and other substances in the filter layer and preventing the filter media 3 from caking, so that it can fully restore its interception capacity and thus achieve the purpose of cleaning.

[0047] In some embodiments, a grid is provided below the filter media 3 for support, and a filter screen is provided above it. Both the grid and the filter screen are fixed to the inner wall of the housing 8.

[0048] How to use:

[0049] S1: Nitrogen is introduced into the nitrogen inlet 5 for cleaning. Nitrogen is introduced first to drive the hydrocarbon liquid 9 to separate by vortexing. The hydrocarbon liquid is collected at the liquid collection port 6. The medium separates the dirt through the rotating fluid. The introduction of nitrogen first plays a role in the replacement of safety protection. Due to the vortexing effect, the nitrogen gathers in the middle and generates an upward airflow 7 to disturb the filter media 3.

[0050] S2: First, open the nitrogen inlet valve 12 to introduce nitrogen. Observe the nitrogen pressure gauge 13. When it reaches 0.2MPa to 0.4MPa, close the nitrogen inlet valve 12. Open the hydrocarbon liquid receiving port valve 14 to allow the hydrocarbon liquid 9 to directly enter the oil receiving tank. Observe the liquid level in the oil receiving tank. When it no longer rises, close the hydrocarbon liquid receiving port valve 14.

[0051] S3: Loosen the filter media 3 inside the filter, so that the intercepted material adhering to the surface of the filter media 3 can be peeled off and carried away by the subsequent backwash water flow 11. The subsequent backwash water flow 11 enters from the outlet 2 and exits from the inlet 1 to the receiving water tank. This is beneficial for removing sediment, suspended solids and other substances in the filter layer and preventing the filter media 3 from caking, so that it can fully restore its interception capacity and thus achieve the purpose of cleaning.

[0052] See Figure 1 , Figure 2 , Figure 3 In some embodiments, the filter material 3 is topped by a spiral guide rail 4, which is a concentrically open groove structure 10 fixed to the inner wall of the housing 8. The spiral guide rail 4 has two through holes tangentially opened at both ends along the outside of the housing 8.

[0053] In some embodiments, the hydrocarbon liquid collection port 6 of the spiral guide rail 4 is inclined downward along the axial direction of the shell 8 at an angle of 10 to 20 degrees, that is, the hydrocarbon liquid collection port 6 is slightly lower than the nitrogen inlet 5 on the other side of the shell 8; this allows for better recovery of the hydrocarbon liquid 9; one through hole is the nitrogen inlet 5, and the other through hole is the hydrocarbon liquid collection port 6. Nitrogen gas is first introduced from the nitrogen inlet 5 at the top of the shell 8 to drive the hydrocarbon liquid 9 to spin and separate, and the hydrocarbon liquid collection port 6 collects the liquid.

[0054] How to use:

[0055] S1: Nitrogen is introduced into the nitrogen inlet 5 for cleaning. Nitrogen is introduced first to drive the hydrocarbon liquid 9 to separate by vortexing. The hydrocarbon liquid is collected at the liquid collection port 6. The medium separates the dirt through the rotating fluid. The introduction of nitrogen first plays a role in the replacement of safety protection. Due to the vortexing effect, the nitrogen gathers in the middle and generates an upward airflow 7 to disturb the filter media 3.

[0056] S2: First, open the nitrogen inlet valve 12 to introduce nitrogen. Observe the nitrogen pressure gauge 13. When it reaches 0.2MPa to 0.4MPa, close the nitrogen inlet valve 12. Open the hydrocarbon liquid receiving port valve 14 to allow the hydrocarbon liquid 9 to directly enter the oil receiving tank. Observe the liquid level in the oil receiving tank. When it no longer rises, close the hydrocarbon liquid receiving port valve 14.

[0057] S3: Loosen the filter media 3 inside the filter, so that the intercepted material adhering to the surface of the filter media 3 can be peeled off and carried away by the subsequent backwash water flow 11. The subsequent backwash water flow 11 enters from the outlet 2 and exits from the inlet 1 to the receiving water tank. This is beneficial for removing sediment, suspended solids and other substances in the filter layer and preventing the filter media 3 from caking, so that it can fully restore its interception capacity and thus achieve the purpose of cleaning.

[0058] In some embodiments, the hydrocarbon liquid receiving port 6 allows the hydrocarbon liquid 9 to directly enter the oil receiving tank without entering the receiving water tank.

[0059] In some embodiments, see Figure 1 , Figure 2 , Figure 3 The housing 8 has an inlet 1 on one side and an outlet 2 on the other side. Filter media 3 is installed inside the housing 8, and a spiral guide rail 4 is located above the filter media 3. The spiral guide rail 4 has two through holes tangentially along the outside of the housing 8; one through hole is a nitrogen inlet 5, and the other is a hydrocarbon liquid collection port 6. Nitrogen gas is first introduced through the nitrogen inlet 5 at the top of the housing to drive the hydrocarbon liquid 9 through vortex separation. The hydrocarbon liquid collection port 6 collects the liquid. The medium separates contaminants through vortex fluid separation. The initial introduction of nitrogen gas serves as a safety protection and displacement mechanism. Due to the vortex separation, the nitrogen gas accumulates in the middle and generates an upward airflow 7 that disturbs the filter media 3. This loosens the filter media 3, allowing the trapped material adhering to the surface of the filter media 3 to peel off and be carried away by the subsequent backwash water flow 11. This facilitates the removal of sediment and suspended solids from the filter layer and prevents the filter media 3 from caking, allowing it to fully restore its interception capacity, thereby achieving the cleaning purpose. The hydrocarbon liquid collection port 6 allows the hydrocarbon liquid 9 to directly enter the oil receiving tank without entering the receiving water tank, saving energy, facilitating cleaning, and saving manpower and time.

[0060] How to use:

[0061] S1: Nitrogen is introduced into the nitrogen inlet 5 for cleaning. Nitrogen is introduced first to drive the hydrocarbon liquid 9 to separate by vortexing. The hydrocarbon liquid is collected at the liquid collection port 6. The medium separates the dirt through the rotating fluid. The introduction of nitrogen first plays a role in the replacement of safety protection. Due to the vortexing effect, the nitrogen gathers in the middle and generates an upward airflow 7 to disturb the filter media 3.

[0062] S2: First, open the nitrogen inlet valve 12 to introduce nitrogen. Observe the nitrogen pressure gauge 13. When it reaches 0.2MPa to 0.4MPa, close the nitrogen inlet valve 12. Open the hydrocarbon liquid receiving port valve 14 to allow the hydrocarbon liquid 9 to directly enter the oil receiving tank. Observe the liquid level in the oil receiving tank. When it no longer rises, close the hydrocarbon liquid receiving port valve 14.

[0063] S3: Loosen the filter media 3 inside the filter, so that the intercepted material adhering to the surface of the filter media 3 can be peeled off and carried away by the subsequent backwash water flow 11. The subsequent backwash water flow 11 enters from the outlet 2 and exits from the inlet 1 to the receiving water tank. This is beneficial for removing sediment, suspended solids and other substances in the filter layer and preventing the filter media 3 from caking, so that it can fully restore its interception capacity and thus achieve the purpose of cleaning.

[0064] In some embodiments, a dual-media filter is preferably made of a metal material with a certain strength, such as aluminum alloy or steel alloy.

[0065]

Example 1

[0066] See Figure 1 , Figure 2 , Figure 3 This application discloses a dual-media filter, including a housing 8. The housing 8 has an inlet 1 at its upper end and an outlet 2 at its lower end. Filter media 3 is disposed inside the housing 8, and a spiral guide rail 4 is positioned above the filter media 3. The spiral guide rail 4 has two through holes tangentially along the outside of the housing 8. One through hole connects to a nitrogen inlet 5, and the other through hole connects to a hydrocarbon liquid collection port 6. Nitrogen gas is introduced through the nitrogen inlet 5 at the upper part of the housing 8 to drive the hydrocarbon liquid 9 to separate by vortexing. The hydrocarbon liquid collection port 6 collects the liquid. The hydrocarbon liquid collection port 6 allows the hydrocarbon liquid 9 to directly enter an oil receiving tank without needing to enter a water receiving tank. The housing 8 has an inlet 1 on one side and an outlet 2 on the other side, both of which have filter screens.

[0067] How to use:

[0068] S1: Nitrogen is introduced into the nitrogen inlet 5 for cleaning. Nitrogen is introduced first to drive the hydrocarbon liquid 9 to separate by vortexing. The hydrocarbon liquid is collected at the liquid collection port 6. The medium separates the dirt through the rotating fluid. The introduction of nitrogen first plays a role in the replacement of safety protection. Due to the vortexing effect, the nitrogen gathers in the middle and generates an upward airflow 7 to disturb the filter media 3.

[0069] S2: First, open the nitrogen inlet valve 12 to introduce nitrogen. Observe the nitrogen pressure gauge 13. When it reaches 0.2MPa to 0.4MPa, close the nitrogen inlet valve 12. Open the hydrocarbon liquid receiving port valve 14 to allow the hydrocarbon liquid 9 to directly enter the oil receiving tank. Observe the liquid level in the oil receiving tank. When it no longer rises, close the hydrocarbon liquid receiving port valve 14.

[0070] S3: Loosen the filter media 3 inside the filter, so that the intercepted material adhering to the surface of the filter media 3 can be peeled off and carried away by the subsequent backwash water flow 11. The subsequent backwash water flow 11 enters from the outlet 2 and exits from the inlet 1 to the receiving water tank. This is beneficial for removing sediment, suspended solids and other substances in the filter layer and preventing the filter media 3 from caking, so that it can fully restore its interception capacity and thus achieve the purpose of cleaning.

[0071]

Example 2

[0072] See Figure 1 , Figure 2 , Figure 3This application discloses a dual-media filter, including a housing 8. The housing 8 has an inlet 1 at its upper end and an outlet 2 at its lower end. Filter media 3 is disposed inside the housing 8, and a spiral guide rail 4 is positioned above the filter media 3. The spiral guide rail 4 has two through holes tangentially along the outside of the housing 8; one through hole connects to a nitrogen inlet 5, and the other through hole connects to a hydrocarbon liquid collection port 6. Nitrogen gas is introduced through the nitrogen inlet 5 at the upper part of the housing 8 to drive the hydrocarbon liquid 9 to separate by vortexing, and the hydrocarbon liquid collection port 6 collects the liquid. The hydrocarbon liquid collection port 6 allows the hydrocarbon liquid 9 to directly enter an oil receiving tank without needing to enter a water receiving tank. The housing 8 has an inlet 1 on one side and an outlet 2 on the other side, both of which have filter screens. The filter media 3 is supported by a grid at the bottom and has filter screens fixed to the inner wall of the housing 8 at the top.

[0073] How to use:

[0074] S1: Nitrogen is introduced into the nitrogen inlet 5 for cleaning. Nitrogen is introduced first to drive the hydrocarbon liquid 9 to separate by vortexing. The hydrocarbon liquid is collected at the liquid collection port 6. The medium separates the dirt through the rotating fluid. The introduction of nitrogen first plays a role in the replacement of safety protection. Due to the vortexing effect, the nitrogen gathers in the middle and generates an upward airflow 7 to disturb the filter media 3.

[0075] S2: First, open the nitrogen inlet valve 12 to introduce nitrogen. Observe the nitrogen pressure gauge 13. When it reaches 0.2MPa to 0.4MPa, close the nitrogen inlet valve 12. Open the hydrocarbon liquid receiving port valve 14 to allow the hydrocarbon liquid 9 to directly enter the oil receiving tank. Observe the liquid level in the oil receiving tank. When it no longer rises, close the hydrocarbon liquid receiving port valve 14.

[0076] S3: Loosen the filter media 3 inside the filter, so that the intercepted material adhering to the surface of the filter media 3 can be peeled off and carried away by the subsequent backwash water flow 11. The subsequent backwash water flow 11 enters from the outlet 2 and exits from the inlet 1 to the receiving water tank. This is beneficial for removing sediment, suspended solids and other substances in the filter layer and preventing the filter media 3 from caking, so that it can fully restore its interception capacity and thus achieve the purpose of cleaning.

[0077]

Example 3

[0078] See Figure 1 , Figure 2 , Figure 3This application discloses a dual-media filter, including a housing 8. The housing 8 has an inlet 1 at its upper end and an outlet 2 at its lower end. Filter media 3 is disposed inside the housing 8, and a spiral guide rail 4 is positioned above the filter media 3. The spiral guide rail 4 has two through holes tangentially along the outside of the housing 8; one through hole connects to a nitrogen inlet 5, and the other through hole connects to a hydrocarbon liquid collection port 6. The hydrocarbon liquid collection port 6 of the spiral guide rail 4 is inclined downwards along the axial direction of the housing 8 at an angle of 10 to 20 degrees, meaning the hydrocarbon liquid collection port 6 is slightly lower than the nitrogen inlet 5 on the other side of the housing 8; this allows for better recovery of hydrocarbon liquid 9. Nitrogen gas is first introduced through the nitrogen inlet 5 at the upper part of the housing 8 to drive the hydrocarbon liquid 9 to separate by vortexing, and the hydrocarbon liquid collection port 6 collects the liquid. The hydrocarbon liquid collection port 6 allows the hydrocarbon liquid 9 to directly enter the oil collection tank without entering the water receiving tank. The housing 8 has an inlet 1 on one side and an outlet 2 on the other side, both of which have filter screens. The filter media 3 is supported by a grid below and has filter screens fixed to the inner wall of the housing 8 above.

[0079] See Figure 1 , Figure 2 , Figure 3 Above the filter material 3 is a spiral guide rail 4, which is a concentric open groove structure 10, fixed on the inner wall of the housing 8. Two through holes are opened at both ends of the spiral guide rail 4 along the outer tangential direction of the housing 8.

[0080] How to use:

[0081] S1: Nitrogen is introduced into the nitrogen inlet 5 for cleaning. Nitrogen is introduced first to drive the hydrocarbon liquid 9 to separate by vortexing. The hydrocarbon liquid is collected at the liquid collection port 6. The medium separates the dirt through the rotating fluid. The introduction of nitrogen first plays a role in the replacement of safety protection. Due to the vortexing effect, the nitrogen gathers in the middle and generates an upward airflow 7 to disturb the filter media 3.

[0082] S2: First, open the nitrogen inlet valve 12 to introduce nitrogen. Observe the nitrogen pressure gauge 13. When it reaches 0.2MPa to 0.4MPa, close the nitrogen inlet valve 12. Open the hydrocarbon liquid receiving port valve 14 to allow the hydrocarbon liquid 9 to directly enter the oil receiving tank. Observe the liquid level in the oil receiving tank. When it no longer rises, close the hydrocarbon liquid receiving port valve 14.

[0083] S3: Loosen the filter media 3 inside the filter, so that the intercepted material adhering to the surface of the filter media 3 can be peeled off and carried away by the subsequent backwash water flow 11. The subsequent backwash water flow 11 enters from the outlet 2 and exits from the inlet 1 to the receiving water tank. This is beneficial for removing sediment, suspended solids and other substances in the filter layer and preventing the filter media 3 from caking, so that it can fully restore its interception capacity and thus achieve the purpose of cleaning.

[0084]

Example 4

[0085] See Figure 1 , Figure 2 , Figure 3This application discloses a dual-media filter, including a housing 8. The housing 8 has an inlet 1 on one side and an outlet 2 on the other. Filter media 3 is disposed inside the housing 8, and a spiral guide rail 4 is positioned above the filter media 3. The spiral guide rail 4 is a concentrically open groove-shaped structure 10, fixed to the inner wall of the housing 8. Two through holes are tangentially opened at both ends of the spiral guide rail 4 along the outer surface of the housing 8. One through hole connects to a nitrogen inlet 5, and the other through hole connects to a hydrocarbon liquid collection port 6. Nitrogen gas is introduced through the nitrogen inlet 5 at the top of the housing 8 to drive the hydrocarbon liquid 9 to separate by vortexing. The hydrocarbon liquid collection port 6 collects the liquid. The hydrocarbon liquid collection port 6 allows the hydrocarbon liquid 9 to directly enter an oil receiving tank without needing to enter a water receiving tank. The housing 8 has an inlet 1 on one side and an outlet 2 on the other, both with filter screens. The filter media 3 is supported by a grid below and has filter screens fixed to the inner wall of the housing 8 above.

[0086] The hydrocarbon liquid receiving port 6 of the spiral guide rail 4 is inclined downward along the axial direction of the shell 8 at an angle of 10 to 20 degrees, meaning that the hydrocarbon liquid receiving port 6 is slightly lower than the nitrogen inlet 5 on the other side of the shell 8; this allows for better recovery of the hydrocarbon liquid 9. Nitrogen gas is first introduced from the nitrogen inlet 5 at the top of the shell 8 to drive the hydrocarbon liquid 9 to separate by vortexing, and then the hydrocarbon liquid receiving port 6 collects the liquid. The hydrocarbon liquid receiving port 6 allows the hydrocarbon liquid 9 to directly enter the oil receiving tank without entering the receiving water tank.

[0087] How to use:

[0088] S1: Nitrogen is introduced into the nitrogen inlet 5 for cleaning. Nitrogen is introduced first to drive the hydrocarbon liquid 9 to separate by vortexing. The hydrocarbon liquid is collected at the liquid collection port 6. The medium separates the dirt through the rotating fluid. The introduction of nitrogen first plays a role in the replacement of safety protection. Due to the vortexing effect, the nitrogen gathers in the middle and generates an upward airflow 7 to disturb the filter media 3.

[0089] S2: First, open the nitrogen inlet valve 12 to introduce nitrogen. Observe the nitrogen pressure gauge 13. When it reaches 0.2MPa to 0.4MPa, close the nitrogen inlet valve 12. Open the hydrocarbon liquid receiving port valve 14 to allow the hydrocarbon liquid 9 to directly enter the oil receiving tank. Observe the liquid level in the oil receiving tank. When it no longer rises, close the hydrocarbon liquid receiving port valve 14.

[0090] S3: Loosen the filter media 3 inside the filter, so that the intercepted material adhering to the surface of the filter media 3 can be peeled off and carried away by the subsequent backwash water flow 11. The subsequent backwash water flow 11 enters from the outlet 2 and exits from the inlet 1 to the receiving water tank. This is beneficial for removing sediment, suspended solids and other substances in the filter layer and preventing the filter media 3 from caking, so that it can fully restore its interception capacity and thus achieve the purpose of cleaning.

[0091]

Example 5

[0092] A dual-media filter includes a housing 8, with an inlet 1 at the upper end and an outlet 2 at the lower end. Filter media 3 is disposed inside the housing 8, and a spiral guide rail 4 is positioned above the filter media 3. The spiral guide rail 4 has two through holes tangentially along the outer surface of the housing 8; one through hole connects to a nitrogen inlet 5, and the other through hole connects to a hydrocarbon liquid collection port 6. Nitrogen gas is introduced through the nitrogen inlet 5 at the upper part of the housing 8 to drive the hydrocarbon liquid 9 for cyclone separation, and the hydrocarbon liquid collection port 6 collects the liquid. The hydrocarbon liquid collection port 6 allows the hydrocarbon liquid to directly enter an oil receiving tank, bypassing the water receiving tank. The housing 8 has an inlet 1 on one side and an outlet 2 on the other side, both with filter screens. The filter media 3 is supported by a grid below and has filter screens fixed to the inner wall of the housing 8 above. (See also...) Figure 1 , Figure 2 , Figure 3 Above the filter media 3 is a spiral guide rail 4, which is a concentrically open groove-shaped structure 10 fixed to the inner wall of the housing 8. Two through holes are tangentially opened at both ends of the spiral guide rail 4 along the outer side of the housing 8. The spiral guide rail 4 and the tangential through holes are inclined downwards along the axial direction of the housing 8 at an angle of 10 to 20 degrees, which can better recover the hydrocarbon liquid 9. Nitrogen gas is first introduced through the nitrogen inlet 5 at the top of the housing 8 to drive the hydrocarbon liquid 9 to separate by vortexing, and the hydrocarbon liquid collection port 6 collects the liquid. The hydrocarbon liquid collection port 6 allows the hydrocarbon liquid 9 to directly enter the oil collection tank without entering the water receiving tank.

[0093] See Figure 1 , Figure 2 , Figure 3 The shell 8 has an inlet 1 at the upper end and an outlet 2 at the lower end. Filter media 3 is installed inside the shell 8, and a spiral guide rail 4 is located above the filter media 3. The spiral guide rail 4 has two through holes tangentially along the outside of the shell 8; one through hole connects to a nitrogen inlet 5, and the other through hole connects to a hydrocarbon liquid collection port 6. Nitrogen gas is first introduced through the nitrogen inlet 5 at the upper part of the shell to drive the hydrocarbon liquid 9 through vortex separation. The hydrocarbon liquid collection port 6 collects the liquid. The medium separates contaminants through vortex fluid separation. The initial introduction of nitrogen gas serves as a safety protection and displacement function. Due to the vortex separation, the nitrogen gas accumulates in the middle and generates an upward airflow 7 that disturbs the filter media 3. This loosens the filter media 3 inside the filter, allowing the intercepted material adhering to the surface of the filter media 3 to peel off and be carried away by the subsequent backwash water flow 11. This facilitates the removal of sediment and suspended solids in the filter layer and prevents the filter media 3 from caking, allowing it to fully restore its interception capacity, thereby achieving the purpose of cleaning. The hydrocarbon liquid collection port 6 allows the hydrocarbon liquid 9 to directly enter the oil receiving tank without entering the receiving water tank, saving energy, facilitating cleaning, and saving manpower and time.

[0094] A dual-media filter is preferably made of a metal material with a certain strength, such as aluminum alloy or steel alloy.

[0095] How to use:

[0096] S1: Nitrogen is introduced into the nitrogen inlet 5 for cleaning. Nitrogen is introduced first to drive the hydrocarbon liquid 9 to separate by vortexing. The hydrocarbon liquid is collected at the liquid collection port 6. The medium separates the dirt through the rotating fluid. The introduction of nitrogen first plays a role in the replacement of safety protection. Due to the vortexing effect, the nitrogen gathers in the middle and generates an upward airflow 7 to disturb the filter media 3.

[0097] S2: First, open the nitrogen inlet valve 12 to introduce nitrogen. Observe the nitrogen pressure gauge 13. When it reaches 0.2MPa to 0.4MPa, close the nitrogen inlet valve 12. Open the hydrocarbon liquid receiving port valve 14 to allow the hydrocarbon liquid 9 to directly enter the oil receiving tank. Observe the liquid level in the oil receiving tank. When it no longer rises, close the hydrocarbon liquid receiving port valve 14.

[0098] S3: Loosen the filter media 3 inside the filter, so that the intercepted material adhering to the surface of the filter media 3 can be peeled off and carried away by the subsequent backwash water flow 11. The subsequent backwash water flow 11 enters from the outlet 2 and exits from the inlet 1 to the receiving water tank. This is beneficial for removing sediment, suspended solids and other substances in the filter layer and preventing the filter media 3 from caking, so that it can fully restore its interception capacity and thus achieve the purpose of cleaning.

[0099] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A dual-media filter, characterized in that, Includes a shell (8), with an inlet (1) at the upper end and an outlet (2) at the lower end. Filter material (3) is provided inside the shell (8), and a spiral guide rail (4) is inclined above the filter material (3). The spiral guide rail (4) is a concentrically open groove structure (10) and is fixed on the inner wall of the shell (8). Two through holes are opened at both ends of the spiral guide rail (4) along the tangent of the shell (8). One through hole is connected to the nitrogen inlet (5), and the other through hole is connected to the hydrocarbon liquid collection port (6). The hydrocarbon liquid collection port (6) of the spiral guide rail (4) is inclined downward at an angle of 10 degrees to 20 degrees.

2. The dual-media filter according to claim 1, characterized in that, Both the inlet (1) and outlet (2) are equipped with filters.

3. A dual-media filter according to claim 1, characterized in that, The filter material (3) is provided with a grid for support below and a filter screen above. Both the grid and the filter screen are fixed on the inner wall of the housing (8).

4. A dual-media filter according to claim 1, characterized in that, A nitrogen inlet valve (12) is provided at the nitrogen inlet (5); a nitrogen pressure gauge (13) is provided behind the nitrogen inlet valve (12).

5. A dual-media filter according to claim 1, characterized in that, The hydrocarbon liquid receiving port (6) is provided with a hydrocarbon liquid receiving port valve (14).

6. A method of using the dual-media filter according to any one of claims 1 to 5, characterized in that, include: S1: Open the nitrogen inlet (5) and introduce nitrogen to the preset pressure range; S2: Open the hydrocarbon liquid receiving port (6) to allow the hydrocarbon liquid (9) to enter the oil receiving tank directly. Observe the liquid level in the oil receiving tank. When it no longer rises, close the hydrocarbon liquid receiving port (6). S3: Clean the dual-media filter.

7. A method of using a dual-media filter according to claim 6, characterized in that, The preset pressure range is 0.2 MPa to 0.4 MPa; and a nitrogen inlet valve (12) is provided at the nitrogen inlet (5); a nitrogen pressure gauge (13) is provided behind the nitrogen inlet valve (12); a hydrocarbon liquid receiving port valve (14) is provided at the hydrocarbon liquid receiving port (6); both the nitrogen inlet valve (12) and the hydrocarbon liquid receiving port valve (14) are controlled manually or automatically.

8. The method of using a dual-media filter according to claim 6, characterized in that, The cleaning dual-filter specifically includes: S301: Remove the intercepting material adhering to the surface of the filter media (3); S302: Backwash water (11) enters from outlet (2) and flows out from inlet (1) to flush the filter.

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