Two-section type self-cleaning filtering device

Abstract

The utility model discloses a two-section type self-cleaning filtering device which comprises a first-section filter, a second-section filter and a pipeline system, the pipeline system comprises a filtering pipeline and a cleaning pipeline; the filtering pipeline comprises a pipe I and a pipe II, and the pipe I and the pipe II are both connected with a section of filter; the pipe I is connected with an unfiltered solution, and the pipe II is used for discharging the filtered solution; the cleaning pipeline comprises a third pipe, a fourth pipe, a fifth pipe and a sixth pipe; two ends of a third pipe are respectively connected with the first-section filter and the second-section filter, two ends of a fourth pipe are respectively connected with the second-section filter and the pregnant solution collecting tank, and two ends of a fifth pipe are connected with the second-section filter and the sewage degassing water tank; two ends of the pipe VI are connected with a second-section filter and a desalted water supply source; the first pipe, the second pipe, the third pipe, the fourth pipe, the fifth pipe and the sixth pipe are each provided with a valve. When the first-section filter is self-cleaned, an unfiltered solution continuously enters through the pipe I, is mixed with waste liquid and then enters the second-section filter through the pipe III to be temporarily filtered, feeding does not need to be interrupted, and continuous operation of the system is guaranteed.

Description

TECHNICAL FIELD

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

[0002] Natural gas needs to be desulfurized after exploitation, and the commonly used method is wet desulfurization. Through wet desulfurization, hydrogen sulfide (H2S), carbon dioxide (CO2) and other acidic components can be removed to avoid corrosion of pipelines and equipment and pollution of the environment. During the wet desulfurization process, the absorbent (such as amine solution) may mix with solid particles (such as catalyst powder, corrosion products), oil stains and degradation products during circulation. These impurities can cause particle impurities to wear out pumps, valves, nozzles and other components, block the channels of the packed tower or heat exchanger, and reduce the mass transfer efficiency. Therefore, a filter is needed to filter out the impurities in the solution during the wet desulfurization process.

[0003] The filter device commonly used in industrial production is mostly single-stage or simple two-stage structure. The single-stage filter needs to be stopped and cleaned after the filter core is blocked, which causes the entire production process to be interrupted. In particular, in the scenarios of petrochemicals, natural gas treatment and other 24-hour continuous operation, frequent shutdown not only reduces efficiency, but also may cause material waste and equipment damage. Although some two-stage filter devices have a grading filter function, the cleaning process of the two-stage filters is usually interrelated and cannot be operated independently. For example, when the first-stage filter is cleaned, the second-stage filter needs to be stopped simultaneously to avoid medium mixing, or when the second-stage filter is cleaned, the first-stage filter main road needs to be interrupted, which causes the entire system to still need to be stopped for maintenance. This "tandem" cleaning mode cannot realize "filtering while maintaining", and it is difficult to meet the requirements of high continuity production for equipment reliability and efficiency.

[0004] In the patent with application number CN202421077399.9, a clean production equipment for amine desulfurization system is disclosed, wherein the lean amine outlet of the amine purifier is also connected to the desulfurization tower through a pipeline to make the regenerated lean amine used for desulfurization of sulfur-containing gas. This purification equipment for desulfurization system has the advantage of low energy consumption, but this single-stage treatment device is prone to blockage during use, and once blocked, it needs to be stopped and replaced, which reduces the overall efficiency. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a two-stage self-cleaning filter device to solve the following technical problems raised in the background art:

[0006] The existing single-stage treatment device has the problem of easy blockage and cannot meet the needs of continuous production.

[0007] To solve the above technical problems, the utility model adopts the technical scheme of:

[0008] A two-stage self-cleaning filter device, comprising a first-stage filter, a second-stage filter and a pipeline system; the pipeline system comprises a filter pipeline and a cleaning pipeline; the filter pipeline comprises pipe one and pipe two, both of which are connected with the first-stage filter; pipe one is connected with unfiltered solution, and pipe two discharges filtered solution; the cleaning pipeline comprises pipe three, pipe four, pipe five and pipe six; both ends of pipe three are connected with the first-stage filter and the second-stage filter respectively, both ends of pipe four are connected with the second-stage filter and a rich liquid collecting tank respectively, both ends of pipe five are connected with the second-stage filter and a sewage degassing tank, and both ends of pipe six are connected with the second-stage filter and a desalted water supply source; valves are arranged on pipe one, pipe two, pipe three, pipe four, pipe five and pipe six respectively.

[0009] Further, a first flow meter is arranged on pipe one, a first check valve is arranged on pipe two, and a second flow meter is arranged on pipe three.

[0010] Further, a pipe seven is arranged between pipe one and pipe two, both ends of the pipe seven are connected with pipe one and pipe two respectively, and a valve is arranged on the pipe seven.

[0011] Further, the device further comprises a pipe eight and a pipe nine; one end of the pipe eight is connected with a lean liquid / desalted water / nitrogen source, the other end of the pipe eight is connected with pipe one; both ends of the pipe nine are connected with the first-stage filter and a rich liquid recovery tank; valves are arranged on the pipe eight and the pipe nine.

[0012] Further, the device further comprises a pipe ten and a pipe eleven; both ends of the pipe ten are connected with pipe six and pipe three respectively; both ends of the pipe eleven are connected with the second-stage filter and pipe nine respectively; valves are arranged on the pipe ten and the pipe eleven.

[0013] Further, a first differential pressure meter is arranged between pipe one and pipe two, and a second differential pressure meter is arranged between pipe three and pipe four.

[0014] Further, the device further comprises a pipe twelve, both ends of the pipe twelve are connected with the pipe eight and the pipe ten, and a valve is arranged on the pipe twelve.

[0015] Further, a second check valve is arranged on the pipe eight.

[0016] Further, a pressure regulating valve is arranged on the rich liquid collecting tank.

[0017] Further, a third flow meter and a third check valve are arranged on the pipe six.

[0018] Compared with the prior art, the device has the following beneficial effects:

[0019] The utility model discloses a filter part of two-stage filter part structure schematic diagram, one filter part and two-stage filter part are connected, and the filter part is connected with the second flowmeter, the second flowmeter is connected with the second differential pressure gauge, the second differential pressure gauge is connected with the second check valve, the second check valve is connected with the pipe three, the pipe three is connected with the second check valve, the second check valve is connected with the pipe four, the pipe four is connected with the rich liquid collection jar, the pipe four is connected with the pipe five, the pipe five is connected with the second check valve, the second check valve is connected with the pipe six, the pipe six is connected with the third flowmeter, the third flowmeter is connected with the third check valve, the third check valve is connected with the pipe seven, the pipe seven is connected with the rich liquid recovery jar, the pipe seven is connected with the pipe eight, the pipe eight is connected with the first check valve, the first check valve is connected with the pipe nine, the pipe nine is connected with the first flowmeter, the first flowmeter is connected with the first differential pressure gauge, the first differential pressure gauge is connected with the pipe ten, the pipe ten is connected with the pipe eleven, the pipe eleven is connected with the waste liquid degassing water jar. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is whole structure schematic diagram of the utility model;

[0021] Figure 2 It is structure schematic diagram of one filter part of the utility model;

[0022] Figure 3 It is structure schematic diagram of two-stage filter part of the utility model.

[0023] Mark in drawing: 1 - pipe eight, 2 - second check valve, 3 - one filter, 4 - pipe nine, 5 - pipe eleven, 6 - second differential pressure gauge, 7 - pipe four, 8 - rich liquid collection jar, 9 - pipe one, 10 - first differential pressure gauge, 12 - pipe three, 13 - second flowmeter, 14 - pipe five, 15 - two-stage filter, 16 - third flowmeter, 17 - third check valve, 18 - pipe six, 19 - pipe seven, 20 - first check valve, 21 - first flowmeter, 22 - pipe two, 23 - pipe twelve, 24 - pipe ten, 25 - rich liquid recovery jar, 26 - waste liquid degassing water jar. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the range of protection of the utility model.

[0025] Embodiment:

[0026] A two-stage self-cleaning filter device, comprising a first filter 3, a second filter 15 and a pipeline system; the pipeline system comprises a filtering pipeline and a cleaning pipeline; the filtering pipeline comprises pipe 1 9 and pipe 2 2, both of which are connected with the first filter 3; pipe 1 9 is connected with unfiltered solution, and pipe 2 2 is connected with filtered solution; the cleaning pipeline comprises pipe 3 12, pipe 4 7, pipe 5 14 and pipe 6 18; both ends of pipe 3 12 are connected with the first filter 3 and the second filter 15 respectively, both ends of pipe 4 7 are connected with the second filter 15 and a rich solution collecting tank 8 respectively, both ends of pipe 5 14 are connected with the second filter 15 and a sewage degassing tank 26, and both ends of pipe 6 18 are connected with the second filter 15 and a desalted water supply source; valves are arranged on pipe 1 9, pipe 2 2, pipe 3 12, pipe 4 7, pipe 5 14 and pipe 6 18 respectively.

[0027] As shown in the drawings, the first filter 3 is provided with N1, N2, N3 and N4 ports; wherein N1 is an inlet, N2 is an outlet, N3 is a sewage outlet, and N4 is an auxiliary port; the second filter 15 is also provided with N1*, N2*, N3* and N4* ports; wherein N1* is an inlet, N2* is an outlet, N3* is a sewage outlet, and N4* is an auxiliary port. Figure 1

[0028] Specifically, pipe 1 9 is connected with N1 port, pipe 2 2 is connected with N2 port, pipe 3 12 is connected with N3 and N1* ports, pipe 4 7 is connected with N2* port, and pipe 5 14 is connected with N3* port; the first filter 3 and the second filter 15 are both provided with filter cores.

[0029] In use, the valves on pipe 1 9 and pipe 2 2 are opened, unfiltered solution enters the first filter 3 through pipe 1 9, filtered solution is led away through pipe 2 2, and waste liquid after filtration stays in the first filter 3.

[0030] The first filter 3 needs to be self-cleaned after a period of use; when the first filter 3 is self-cleaned, the valve on pipe 2 2 is closed, and the valve on pipe 3 12 is opened; unfiltered solution enters the first filter 3 through pipe 1 9 and mixes with waste liquid, and the mixed liquid enters the second filter 15 through pipe 3 12.

[0031] When the first filter 3 is self-cleaned, the second filter 15 is enabled, the valve on pipe 4 7 is opened, the second filter 15 filters the mixed liquid, waste liquid stays in the second filter 15, and filtered liquid enters the rich solution collecting tank 8 through pipe 4 7; after the self-cleaning of the first filter 3 is completed, the valves on pipe 3 12 and pipe 4 7 are closed.

[0032] ​The second-stage filter 15 needs to be self-cleaned after being used for a period of time. First, open the valve on pipe five 14, and the waste liquid in the second-stage filter 15 enters the sewage degassing tank 26 through pipe five 14. After the waste liquid is emptied, open the valve on pipe six 18, and the desalted water enters the second-stage filter 15 through pipe six 18 to flush the filter element of the second-stage filter 15, so as to flush away the impurities clogging the filter element. The waste liquid formed by the flushing enters the sewage degassing tank 26 through pipe five 14.

[0033] In a preferred embodiment, a first flow meter 21 is arranged on pipe one 9, a first check valve 20 is arranged on pipe two 22, and a second flow meter 13 is arranged on pipe three 12. The first flow meter 21 is used to measure the flow of the unfiltered solution entering the first-stage filter 3 in real time. The first check valve 20 is used to prevent the filtered solution from flowing backward. The second flow meter 13 is used to measure the flow of the mixed liquid flowing from the first-stage filter 3 to the second-stage filter 15.

[0034] In a preferred embodiment, pipe seven 19 is arranged between pipe one 9 and pipe two 22, and the two ends of pipe seven 19 are connected to pipe one 9 and pipe two 22, respectively. A valve is arranged on pipe seven 19. When the first-stage filter 3 fails to work normally, the valve on pipe seven 19 is opened, and the unfiltered solution can directly flow from pipe one 9 to pipe two 22 through pipe seven 19, bypassing the first-stage filter 3, so as to avoid stopping the operation of the entire filtration system due to the failure of the first-stage filter 3, and maintain a certain production continuity.

[0035] In a preferred embodiment, pipe eight 1 and pipe nine 4 are further included. One end of pipe eight 1 is connected to the lean liquid / desalted water / nitrogen source, and the other end is connected to pipe one 9. The two ends of pipe nine 4 are connected to the first-stage filter 3 and the rich liquid recovery tank 25. Valves are arranged on pipe eight 1 and pipe nine 4.

[0036] Pipe eight 1 connects the lean liquid / desalted water / nitrogen source and pipe one 9. When the valve on pipe eight 1 is opened, cleaning media can be introduced. When the first-stage filter 3 is clogged and needs to be self-cleaned, different types of cleaning media can be provided. The lean liquid can dissolve part of the impurities by its chemical properties. The desalted water has good flushing ability. The nitrogen gas can strip the impurities on the surface of the filter element by high-pressure impact, so as to restore the filtering performance of the filter element and ensure the normal operation of the device.

[0037] Pipe nine 4 connects the first-stage filter 3 and the rich liquid recovery tank 25. When the valve on pipe nine 4 is opened, the waste liquid after being cleaned by the first-stage filter 3 can be introduced into the rich liquid recovery tank 25. In this way, the waste liquid generated by the cleaning can be discharged in time, avoiding affecting the subsequent filtering effect of the first-stage filter 3, and the waste liquid containing certain recyclable components can be recovered to the rich liquid recovery tank 25, realizing the reuse of resources.

[0038] In a preferred embodiment, a pipe ten and a pipe eleven 5 are further included; the pipe ten is connected with the pipe six 18 and the pipe three 12 respectively; the pipe eleven 5 is connected with the two-stage filter 15 and the pipe nine 4 respectively; and valves are arranged on the pipe ten and the pipe eleven 5. The pipe eleven 5 is connected with the N4* port of the two-stage filter 15.

[0039] Specifically, the pipe ten connects the pipe six 18 and the pipe three 12, and is connected with the N1 port of the two-stage filter 15. After opening the valve on the pipe ten, the desalted water can be introduced through the pipe six 18, so as to enter the two-stage filter 15 from the N1 port. The desalted water can replace the impurities in the filter element, and take the impurities out of the filter element, so as to play a role of preliminary cleaning of the filter element, avoid accumulation of the impurities in the filter element to affect the filtering effect, and prepare for subsequent deep cleaning or normal filtering.

[0040] The pipe eleven 5 connects the N4* port of the two-stage filter 15 and the pipe nine 4. After opening the valve on the pipe eleven 5, the replaced solution can enter the rich liquid recovery tank 25 through the pipe eleven 5 and the pipe nine 4. This process can timely discharge the replaced solution, avoid the solution staying in the two-stage filter 15 to cause secondary pollution, and recover the solution containing certain recoverable components after replacement to the rich liquid recovery tank 25.

[0041] In a preferred embodiment, a first differential pressure gauge 10 is arranged between the pipe one 9 and the pipe two 22; and a second differential pressure gauge 6 is arranged between the pipe three 12 and the pipe four 7.

[0042] When the primary filter 3 is normally working, the pipe one 9 transports the unfiltered solution, and the pipe two 22 discharges the filtered solution. The first differential pressure gauge 10 can measure the pressure difference between the two. When the filter element of the primary filter 3 is blocked, the resistance of the fluid passing through the filter element increases, and the pressure difference between the pipe one 9 and the pipe two 22 increases. By monitoring the pressure difference, the blocking condition of the primary filter 3 can be determined in time, so that the self-cleaning program can be started in time, and the filtering performance of the primary filter 3 and the stable operation of the system are ensured.

[0043] The pipe three 12 connects the primary filter 3 and the two-stage filter 15, and transports the mixed liquid when the primary filter 3 is self-cleaning; and the pipe four 7 connects the two-stage filter 15 and the rich liquid collection tank 8, and transports the secondary filtered liquid. The second differential pressure gauge 6 measures the pressure difference between the two, and can reflect the working state of the two-stage filter 15. If the filter element of the two-stage filter 15 is blocked, the pressure difference between the pipe three 12 and the pipe four 7 increases, and the blocking problem of the two-stage filter 15 can be found in time through monitoring of the pressure difference, so that the self-cleaning work of the two-stage filter 15 can be arranged, and the filtering effect of the two-stage filter and the overall efficiency of the system are ensured.

[0044] In a preferred embodiment, a pipe 24 is further included, which is connected with the pipe 8 and the pipe 10 at two ends, and a valve is arranged on the pipe 24. The pipe 24 connects the pipe 8 and the pipe 10, and after the valve on the pipe 24 is opened, poor liquid or nitrogen can be introduced into the pipe 10. For the secondary filter 15, the desalted water can be introduced into the N1* port from the pipe 6 and the pipe 10 to achieve preliminary impurity replacement cleaning. When the poor liquid is introduced, some special impurities can be dissolved by using the chemical properties of the poor liquid; when the nitrogen is introduced, the impurities in the deep layer and the gap of the filter element can be further removed by using the high pressure impact of the nitrogen. In this way, the cleaning means of the secondary filter 15 is enriched, the cleaning effect is improved, the performance of the filter element is restored, and the efficient and stable operation of the secondary filtering device is ensured.

[0045] In a preferred embodiment, a second check valve 2 is arranged on the pipe 8. The second check valve 2 can prevent the medium from flowing back. When the primary filter 3 is closed after self-cleaning, or when the system pressure fluctuates, the solution in the pipe 1 can be prevented from flowing back to the poor liquid / desalted water / nitrogen source, so that the purity of the cleaning medium source is ensured.

[0046] In a preferred embodiment, a pressure regulating valve is arranged on the rich liquid collecting tank 8. The pressure regulating valve is used to maintain the pressure in the tank, and can ensure that the flash gas is connected to the sulfur recovery device.

[0047] In a preferred embodiment, a third flow meter 16 and a third check valve 17 are arranged on the pipe 6. The third flow meter 16 arranged on the pipe 6 can measure the flow of the desalted water entering the secondary filter 15 in real time. By obtaining accurate flow data, it can be known whether the supply of the desalted water meets the cleaning requirements of the secondary filter 15. If the flow is abnormal, problems such as pipeline blockage or leakage can be found in time, so that the cleaning effect and the stable operation of the system are ensured. The third check valve 17 arranged on the pipe 6 can prevent the liquid in the secondary filter 15 from flowing back to the desalted water supply source.

[0048] In the description of the utility model, it should be 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", "center", "two 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 does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0049] In the utility model, unless another definite provision and limitation, the term "installation" "arrangement" "connection" "fixation" "screw connection" and so on term should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two element inside's intercommunication or two element's mutual action relation, unless another definite limitation, for the ordinary skill of the art personnel, can understand the above-mentioned term in the utility model's specific meaning according to specific circumstances.

[0050] Although the embodiments of the utility model have been shown and described, it will be appreciated by those of ordinary skill in the art that various changes, modifications, alternatives, and variations can be made thereto without departing from the principles and spirit of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A two-stage self-cleaning filter apparatus, characterized by: The filter system comprises a first filter (3), a second filter (15) and a pipeline system, wherein the pipeline system comprises a filtering pipeline and a cleaning pipeline. The filtering pipeline comprises a first pipe (9) and a second pipe (22), both of which are connected with the first filter (3); the first pipe (9) is connected with an unfiltered solution, and the second pipe (22) is connected with a filtered solution; the cleaning pipeline comprises a third pipe (12), a fourth pipe (7), a fifth pipe (14) and a sixth pipe (18). The third pipe (12) is connected with the first filter (3) and the second filter (15) at both ends, the fourth pipe (7) is connected with the second filter (15) and a rich solution collecting tank (8) at both ends, the fifth pipe (14) is connected with the second filter (15) and a sewage degassing tank (26) at both ends, and the sixth pipe (18) is connected with the second filter (15) and a desalted water supply source at both ends; the first pipe (9), the second pipe (22), the third pipe (12), the fourth pipe (7), the fifth pipe (14) and the sixth pipe (18) are respectively provided with valves.

2. A two-stage self-cleaning filter device according to claim 1, characterized in that: The first pipe (9) is provided with a first flowmeter (21), and the second pipe (22) is provided with a first check valve (20); the third pipe (12) is provided with a second flowmeter (13).

3. A two-stage self-cleaning filter apparatus according to claim 2, wherein: The first pipe (9) and the second pipe (22) are provided with a seventh pipe (19), and the seventh pipe (19) is connected with the first pipe (9) and the second pipe (22) at both ends; the seventh pipe (19) is provided with a valve.

4. A two-stage self-cleaning filter apparatus according to claim 3, wherein: The filter system further comprises an eighth pipe (1) and a ninth pipe (4); one end of the eighth pipe (1) is connected with a poor solution / desalted water / nitrogen source, and the other end is connected with the first pipe (9); both ends of the ninth pipe (4) are connected with the first filter (3) and a rich solution recovery tank (25); the eighth pipe (1) and the ninth pipe (4) are provided with valves.

5. A two-stage self-cleaning filter apparatus as claimed in claim 4, wherein: The filter system further comprises a tenth pipe and an eleventh pipe (5); both ends of the tenth pipe are connected with the sixth pipe (18) and the third pipe (12); both ends of the eleventh pipe (5) are connected with the second filter (15) and the ninth pipe (4); the tenth pipe and the eleventh pipe (5) are provided with valves.

6. A two-stage self-cleaning filter apparatus according to claim 5, wherein: The first pipe (9) and the second pipe (22) are provided with a first differential pressure gauge (10); the third pipe (12) and the fourth pipe (7) are provided with a second differential pressure gauge (6).

7. A two-stage self-cleaning filter apparatus according to claim 6, wherein: The filter system further comprises a tenth pipe (24), which is connected with the eighth pipe (1) and the tenth pipe at both ends; the tenth pipe (24) is provided with a valve.

8. A two-stage self-cleaning filter apparatus according to claim 7, wherein: The eighth pipe (1) is provided with a second check valve (2).

9. A two-stage self-cleaning filter apparatus according to claim 8, wherein: The rich solution collecting tank (8) is provided with a pressure regulating valve.

10. A two-stage self-cleaning filter apparatus according to claim 9, wherein: The sixth pipe (18) is provided with a third flowmeter (16) and a third check valve (17).

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