Two-section type external source self-cleaning filtering device

Abstract

The utility model discloses a two-section type external source self-cleaning filtering device which comprises a first-section filter, a second-section filter and a pipeline system, a first-section liquid inlet, a first-section liquid outlet and a first-section liquid outlet are formed in the first-section filter; a second-section liquid inlet, a second-section liquid outlet and a second-section liquid outlet are formed in the second-section filter; the two ends of the middle pipeline are connected with the first-section liquid outlet and the second-section liquid inlet respectively, and a cleaning valve is further arranged on the middle pipeline; the replacement pipeline is connected with the second-section liquid inlet and is provided with a replacement valve, the flushing pipeline is connected with the second-section liquid outlet and is provided with a flushing valve, the liquid pipeline is connected with the second-section liquid outlet and is provided with a liquid recovery valve, the easy pipeline is connected with the second-section liquid outlet and is provided with a solution recovery valve, and the blow-off pipeline is connected with the second-section liquid outlet and is provided with a blow-off valve. The whole filtering device does not need to be shut down in the cleaning process, the filtered solution can be continuously provided for a downstream device, and production continuity and stability are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to filter device technical field, concretely is a two -segment formula exogenous self -cleaning filter device. BACKGROUND

[0002] In natural gas purification plant, wet desulfurization, dehydration and tail gas treatment device generally uses chemical solvent absorption method to purify process gas. In this process, the solution circulation system will be subjected to multiple pollution of metal debris produced by pipeline scouring corrosion, fine particles formed by active carbon adsorbent pulverization, and solid impurities (such as sand, rust) carried by raw material gas. These pollutants can significantly increase the foaming tendency of the solution, leading to tower flooding, reduced absorption efficiency, and even causing unplanned shutdown of the device, seriously affecting production stability.

[0003] The existing three-stage filtration system is composed of a front PP filter core filter, an activated carbon filter and a rear PP filter core filter. When using this three-stage filtration system, the PP filter core pores are easily blocked by sticky pollutants such as activated carbon powder and metal oxides, resulting in increased filtration resistance and the need for frequent shutdown and replacement of filter cores. At the same time, the mechanical filtration method cannot separate impurities in real time, and the filter core has limited pollution capacity, making it difficult to meet the long-term continuous operation demand.

[0004] In the patent with publication number CN108911284A, a sewage treatment method for offshore platforms is disclosed. The system effectively treats domestic sewage through two-stage separation tanks. This existing technology uses a two-stage filtration method, which has the advantage of good filtration effect. However, this two-stage filtration method does not have a self-cleaning function, resulting in an increasing amount of internal impurities during use, which requires shutdown and replacement of filter cores. Utility model content

[0005] The purpose of the utility model is to provide a two-stage exogenous self-cleaning filter device to solve the following technical problems raised in the background art:

[0006] The existing filter device has limited filter core pollution capacity, making it difficult to meet the long-term continuous operation demand.

[0007] To solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A two-stage external self-cleaning filter device, comprising a first-stage filter, a second-stage filter and a pipeline system; the first-stage filter is provided with a first-stage liquid inlet, a first-stage liquid outlet and a first-stage liquid discharge port; the second-stage filter is provided with a second-stage liquid inlet, a second-stage liquid outlet and a second-stage liquid discharge port; the pipeline system comprises an intermediate pipeline, a displacement pipeline, a flushing pipeline, a liquid pipeline, a solution pipeline and a blowdown pipeline; the intermediate pipeline is connected with the first-stage liquid discharge port and the second-stage liquid inlet at two ends respectively, and is further provided with a cleaning valve; the displacement pipeline is connected with the second-stage liquid inlet and is provided with a displacement valve; the flushing pipeline is connected with the second-stage liquid outlet and is provided with a flushing valve; the liquid pipeline is connected with the second-stage liquid outlet and is provided with a liquid recovery valve; the solution pipeline is connected with the second-stage liquid outlet and is provided with a solution recovery valve; and the blowdown pipeline is connected with the second-stage liquid discharge port and is provided with a blowdown valve.

[0009] Further, the pipeline system further comprises a liquid inlet pipeline and a liquid outlet pipeline; the liquid inlet pipeline is connected with the first-stage liquid inlet and is provided with a liquid inlet valve; and the liquid outlet pipeline is connected with the first-stage liquid outlet and is provided with a liquid outlet valve.

[0010] Further, the device further comprises a control system; the control system is electrically connected with the cleaning valve, the displacement valve, the flushing valve, the liquid recovery valve, the solution recovery valve and the blowdown valve.

[0011] Further, the first-stage filter is provided with a first differential pressure gauge, and the first differential pressure gauge is electrically connected with the control system.

[0012] Further, the first-stage filter is provided with a timing device, and the timing device is electrically connected with the control system.

[0013] Further, the second-stage filter is provided with a second differential pressure gauge, and the second differential pressure gauge is electrically connected with the control system.

[0014] Further, the first-stage filter is provided with a negative pressure suction nozzle below the filter screen, and the first-stage filter is provided with a vacuum pump outside, and the vacuum pump is connected with the negative pressure suction nozzle.

[0015] Further, the liquid pipeline is connected with a liquid collection tank at an outlet.

[0016] Further, the solution pipeline is connected with a solution collection tank at an outlet.

[0017] Compared with the prior art, the device has the following beneficial effects:

[0018] The two-stage external self-cleaning filter device can undertake the filtering task when the first-stage filter is self-cleaning, and realizes seamless connection of the filtering process. The two-stage alternating working mode enables the whole filtering device to continuously provide filtered solution for downstream devices without shutdown during the cleaning process, and guarantees the continuity and stability of production.

[0019] The self-cleaning function of the first-stage filter can timely remove impurities on the filter screen surface, avoid excessive accumulation of impurities to cause the filter screen to be blocked, and ensure the filtering efficiency and service life of the first-stage filter. Meanwhile, the presence of the second-stage filter also shares part of the pressure of impurity filtration, further reducing the risk of filter screen blockage. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0021] Figure 2 It is a schematic diagram of the system flow path when the first-stage filter is self-cleaning.

[0022] Figure 3 It is a schematic diagram of the system flow path when the second-stage filter is replaced.

[0023] Figure 4 It is a schematic diagram of the system flow path when the second-stage filter is flushed and decontaminated.

[0024] Marked in the figure: 1 - first-stage filter, 2 - first-stage liquid outlet, 3 - liquid outlet pipeline, 4 - liquid outlet valve, 5 - liquid inlet valve, 6 - liquid inlet pipeline, 7 - first-stage liquid inlet, 8 - first-stage liquid outlet, 9 - intermediate pipeline, 10 - cleaning valve, 11 - replacement valve, 12 - replacement pipeline, 13 - second-stage filter, 14 - flushing valve, 15 - flushing pipeline, 16 - liquid recovery valve, 17 - liquid pipeline, 18 - liquid collection tank, 19 - second-stage liquid outlet, 20 - solution recovery valve, 21 - solution pipeline, 22 - solution recovery tank, 23 - second-stage liquid inlet, 24 - second-stage liquid outlet, 25 - decontamination valve, 26 - decontamination pipeline. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] Embodiment:

[0027] A two-stage external self-cleaning filter device, like Figure 1As shown, the filter system comprises a first filter 1, a second filter 13 and a pipeline system; the first filter 1 is provided with a first liquid inlet 7, a first liquid outlet 2 and a first liquid outlet 8; the second filter 13 is provided with a second liquid inlet 23, a second liquid outlet 19 and a second liquid outlet 24; the pipeline system comprises an intermediate pipeline 9, a displacement pipeline 12, a flushing pipeline 15, a liquid pipeline 17, a solution pipeline 21 and a sewage pipeline 26; the two ends of the intermediate pipeline 9 are connected with the first liquid outlet 8 and the second liquid inlet 23 respectively, and the intermediate pipeline 9 is further provided with a cleaning valve 10; the displacement pipeline 12 is connected with the second liquid inlet 23 and provided with a displacement valve 11; the flushing pipeline 15 is connected with the second liquid outlet 19 and provided with a flushing valve 14; the liquid pipeline 17 is connected with the second liquid outlet 19 and provided with a liquid recovery valve 16; the solution pipeline is connected with the second liquid outlet 19 and provided with a solution recovery valve 20; the sewage pipeline 26 is connected with the second liquid outlet 24 and provided with a sewage valve 25.

[0028] Specifically, in use, as shown in Figure 2 unfiltered solution enters the first filter 1 through the first liquid inlet 7, and the residual liquid containing particulate impurities is intercepted inside the first filter 1, and the filtered solution enters the downstream device through the first liquid outlet 2. When the first filter 1 is used for a period of time, the cleaning program is started, the cleaning valve 10 and the solution recovery valve 20 are opened, and the impurity mixed solution enters the second filter 13 through the intermediate pipeline 9. Since the impurities in the first filter 1 are removed, the first filter 1 restores the filtering capacity, and the first filter 1 is closed after self-cleaning.

[0029] When the first filter 1 is performing self-cleaning, it is the filtering process of the second filter 13, and the residue-containing liquid discharged from the self-cleaning of the first filter 1 is filtered again through the second filter 13 and then discharged through the solution pipeline 21, and the impurities are intercepted in the second filter 13 and continuously accumulate.

[0030] When the second filter 13 is used for a period of time, the impurities inside increase, at which time the displacement valve 11 and the liquid recovery valve 16 are opened, as shown in Figure 3 the desalted water is introduced into the second filter 13 through the displacement pipeline 12, the desalted water fully displaces the residue liquid in the second filter 13, and the displacement water is discharged through the liquid pipeline 17. After the displacement process is completed, the displacement valve 11 and the liquid recovery valve 16 are closed, and then the self-cleaning program of the second filter 13 is entered. As shown in Figure 4 the self-cleaning process of the second filter 13 needs to open the flushing valve 14 and the sewage valve 25, and the concentrated residue liquid in the second filter 13 is flushed to the sewage pipeline 26 with desalted water. After the process is completed, the flushing valve 14 and the sewage valve 25 are closed, and the second filter 13 returns to the working state.

[0031] The two-stage external self-cleaning filter device can ensure stable production for a long time without stopping during the self-cleaning process.

[0032] In a preferred embodiment, the pipeline system further comprises a liquid inlet pipe 6 and a liquid outlet pipe 3. The liquid inlet pipe 6 is connected to the first-stage liquid inlet 7 and is provided with a liquid inlet valve 5. The liquid outlet pipe 3 is connected to the first-stage liquid outlet 2 and is provided with a liquid outlet valve 4. The liquid inlet pipe 6 and the liquid inlet valve 5 can accurately control the flow rate and timing of the unfiltered solution entering the first-stage filter 1. When the device is started, the liquid inlet valve 5 can be slowly opened according to actual production needs, allowing the solution to enter the first-stage filter 1 smoothly, avoiding excessive flow rate that may cause impact on the filter screen, affecting the filtering effect and the service life of the filter screen. The liquid outlet pipe 3 and the liquid outlet valve 4 can effectively control the speed and stability of the filtered solution entering the downstream device. By adjusting the opening degree of the liquid outlet valve 4, stable solution supply can be ensured for the downstream device, avoiding adverse effects on the downstream process due to flow rate fluctuations.

[0033] In a preferred embodiment, the control system is electrically connected to the cleaning valve 10, the replacement valve 11, the flushing valve 14, the liquid recovery valve 16, the solution recovery valve 20, and the blowdown valve 25. The control system is used to control the opening and closing of the valves, enabling automatic control.

[0034] Further optimization, a first differential pressure gauge is provided on the first-stage filter 1, and the first differential pressure gauge is electrically connected to the control system. The first differential pressure gauge is used to measure the pressure difference between the inlet and outlet of the first-stage filter 1 in real time, reflecting the degree of filter screen clogging. The control system can determine whether to start the self-cleaning program according to the pressure difference data.

[0035] Further optimization, a timing device is provided on the first-stage filter 1, and the timing device is electrically connected to the control system. The timing device is used to automatically trigger the first-stage self-cleaning at a preset time interval, ensuring timely cleaning of the filter screen and avoiding hidden clogging caused by slow accumulation of impurities. In addition, the timing device and the first differential pressure gauge can constitute a double triggering condition. If the differential pressure does not exceed the limit but the timing reaches, the cleaning is still started to prevent risks; if the differential pressure abnormally rises but the timing has not reached, the cleaning is triggered in advance.

[0036] In a preferred embodiment, a second differential pressure gauge is provided on the second-stage filter 13, and the second differential pressure gauge is electrically connected to the control system. The second differential pressure gauge is used to reflect the clogging condition of the filter screen in the second-stage filter 13. When the pressure difference exceeds the set threshold, the control system automatically starts the replacement or self-cleaning program.

[0037] In a preferred embodiment, a negative pressure suction nozzle is arranged below the filter screen in the first filter 1, and a vacuum pump is arranged outside the first filter 1 and connected to the negative pressure suction nozzle. When the vacuum pump is started, a strong suction force is formed at the negative pressure suction nozzle, which can quickly suck away various particulate impurities such as activated carbon powder and metal debris that are attached to the surface of the filter screen. These impurities are easily attached and accumulated on the surface of the filter screen during the filtration process, which causes the filter screen to be blocked and affects the filtration efficiency and quality. The strong suction effect of the negative pressure suction nozzle can effectively reduce the accumulation of impurities and restore the filtration performance of the filter screen. Since the suction nozzle is arranged below the filter screen, it can suck away the impurities before they are deeply embedded in the filter screen. In particular, if the tiny particles are not removed in time, they can easily enter the inside of the filter screen and cause deep blockage, which is difficult to remove by conventional cleaning methods. The timely action of the negative pressure suction nozzle can reduce this risk and prolong the service life of the filter screen.

[0038] In a preferred embodiment, the outlet of the liquid pipeline 17 is connected to a liquid collection tank 18. Further optimization, the outlet of the solution pipeline 21 is connected to a solution collection tank 22. Among them, the liquid collection tank 18 is mainly used to collect the low-concentration impurity-containing liquid generated during the displacement process of the second filter 13, and the displacement water can be recycled after precipitation or simple filtration. The solution collection tank 22 is used to recover the filtrate of the waste liquid of the first filter 1 after being filtered by the second filter, and the effective components such as desulfurizing agent and catalyst contained in the filtrate can be directly returned to the production system.

[0039] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "central", "both ends" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model. The device or element indicated or implied must have a specific orientation, a specific orientation, and an operation, and therefore cannot be understood as a limitation on the utility model.

[0040] In the utility model, unless otherwise specified and limited, the terms "mounting", "setting", "connection", "fixing", "screw connection" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements, unless otherwise specified, those skilled in the art can understand the specific meaning of the above-mentioned terms in the utility model according to the specific situation.

[0041] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A two-stage, externally self-cleaning filter device, characterized in that: The filter system comprises a first filter (1), a second filter (13) and a pipeline system. The first filter (1) is provided with a first inlet (7), a first outlet (2) and a first drain (8), and the second filter (13) is provided with a second inlet (23), a second outlet (19) and a second drain (24). The pipeline system comprises an intermediate pipeline (9), a displacement pipeline (12), a flushing pipeline (15), a liquid pipeline (17), a solution pipeline (21) and a drain pipeline (26). The intermediate pipeline (9) is connected to the first drain (8) and the second inlet (23) respectively, and is further provided with a cleaning valve (10). The displacement pipeline (12) is connected to the second inlet (23) and is provided with a displacement valve (11). The flushing pipeline (15) is connected to the second outlet (19) and is provided with a flushing valve (14). The liquid pipeline (17) is connected to the second outlet (19) and is provided with a liquid recovery valve (16). The solution pipeline (21) is connected to the second outlet (19) and is provided with a solution recovery valve (20). The drain pipeline (26) is connected to the second drain (24) and is provided with a drain valve (25).

2. A two-stage, externally self-cleaning filter device according to claim 1, characterized in that: The pipeline system further comprises a first inlet pipeline (6) and a first outlet pipeline (3). The first inlet pipeline (6) is connected to the first inlet (7) and is provided with a first inlet valve (5). The first outlet pipeline (3) is connected to the first outlet (2) and is provided with a first outlet valve (4).

3. A two-stage, externally self-cleaning filter device according to claim 1, characterized in that: The control system is electrically connected to the cleaning valve (10), the displacement valve (11), the flushing valve (14), the liquid recovery valve (16), the solution recovery valve (20) and the drain valve (25).

4. A two-stage, externally self-cleaning filter device according to claim 3, characterized in that: The first filter (1) is provided with a first differential pressure gauge, which is electrically connected to the control system.

5. A two-stage, externally self-cleaning filter device according to claim 3, characterized in that: The first filter (1) is provided with a timing device, which is electrically connected to the control system.

6. A two-stage, externally self-cleaning filter device according to claim 3, characterized in that: The second filter (13) is provided with a second differential pressure gauge, which is electrically connected to the control system.

7. A two-stage, externally self-cleaning filter device according to claim 1, characterized in that: The first filter (1) is provided with a negative pressure suction nozzle below the filter screen, and a vacuum pump is arranged on the outside of the first filter (1), which is connected to the negative pressure suction nozzle.

8. A two-stage, externally self-cleaning filter device according to claim 1, characterized in that: The liquid pipeline (17) is connected to a liquid collection tank (18).

9. A two-stage, externally self-cleaning filter device according to claim 1, characterized in that: The solution pipeline (21) is connected to a solution collection tank (22).

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