Gas field water ultrafiltration device and ultrafiltration membrane monitoring method

Abstract

The invention relates to the technical field of ultra-filtration membranes, in particular to a gas field water ultra-filtration device and an ultra-filtration membrane monitoring method.The device comprises an ultra-filtration mechanism, a forward and reverse flushing mechanism, a turnover mechanism and a filter screen, the ultra-filtration mechanism comprises an ultra-filtration cylinder, a water inlet, a water outlet, an aeration pipe, a water inlet pipe, a water outlet pipe, the forward and reverse flushing mechanism comprises a push-pull plate, a first sector plate and a second sector plate, and the turnover mechanism comprises the filter screen. After the pressure difference of a certain ultrafiltration cylinder exceeds a threshold value, backflushing is carried out by changing the angle ranges of the first sector plate and the second sector plate, automatic backflushing cleaning is realized by automatically resetting after backflushing, an external pipeline does not need to be disassembled and assembled, an external water pipe is not needed, manual operation is reduced, and the service life of the ultrafiltration device is prolonged; each surface of the filter screen is uniformly brushed while back flushing is carried out, so that large-particle impurities on the surface are removed, and the overall brushing effect is improved; and meanwhile, a pressure sensor and a turbidity sensor are used for assisting in judging a backflushing triggering threshold value, recording backflushing cleaning time and frequency, analyzing whether replacement or maintenance is needed or not, giving an early warning in time, and reducing cost loss.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrafiltration membranes, in particular to a gas field water ultrafiltration device and an ultrafiltration membrane monitoring method. Background Art

[0002] Gas field produced water refers to the water that is extracted from underground along with natural gas during the natural gas extraction process. Gas field produced water usually contains multiple components. Since the composition of gas field produced water is complex and has certain pollution, it needs to be treated harmlessly. The treated water can be recycled, discharged or used to inject into the formation to enhance oil and gas recovery rate. Ultrafiltration membrane filtration technology is a membrane separation technology that uses a semi-permeable membrane with a microporous structure to filter the liquid, thereby removing particulate matter, colloids, bacteria, viruses and other large molecular pollutants in the water. During use, the membrane pores of the ultrafiltration membrane are blocked by particulate matter, colloids, organic matter or microorganisms, resulting in a decrease in membrane flux and reduced operating efficiency. Some chemicals will react with the membrane material, resulting in a decrease in membrane performance or damage. Solid particles may cause mechanical wear on the membrane and shorten the service life of the membrane. Therefore, the ultrafiltration membrane needs to be backwashed and monitored in time during use to facilitate maintenance or replacement.

[0003] The existing patent with authorization announcement number CN202343107U discloses an ultrafiltration membrane backwash cleaning system, including a clean water tank for the outlet pipe of a pipe-to-pipe membrane water treatment unit. The outlet pipe of the tubular membrane water treatment unit is connected to the inlet and outlet of the clean water tank through two independent branch pipes with water valves respectively. The outlet of the clean water tank and the outlet pipe of the tubular membrane water treatment unit are connected through a backwash pump. The branch pipe connecting the outlet of the clean water tank and the outlet pipe of the tubular membrane water treatment unit is also connected to a medicine tank connected in parallel with the clean water tank through a water pump pipe, which can effectively perform reverse cleaning on the tubular membrane water treatment unit, thereby improving the treatment efficiency and service life of the tubular membrane water treatment unit.

[0004] However, the above technical solution requires an external clean water tank for backflushing, which not only increases the cost but also takes up space. It is impossible to achieve automatic control of backflushing cleaning, and it is also impossible to monitor the ultrafiltration device in real time, analyze and warn based on the number of backflushing times, and judge whether it needs repair and replacement. In addition, in the existing technology, if one of the ultrafiltration membrane devices is blocked, the entire device needs to be shut down for cleaning, and online backflushing cleaning cannot be achieved, which is time-consuming and labor-intensive, affecting production efficiency, and requires external backflushing equipment, which is cumbersome. Summary of the Invention

[0005] In view of the above problems in the prior art, the present invention is proposed.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a gas field water ultrafiltration device, comprising: an ultrafiltration mechanism, including an ultrafiltration cartridge, a water inlet and a water outlet provided on both sides of the outer wall of the ultrafiltration cartridge, an aeration pipe, a water inlet pipe, and a water outlet pipe provided on the end surface of the ultrafiltration cartridge, the water inlet pipe and the water outlet pipe being connected to the water inlet and the water outlet, respectively; and an ultrafiltration membrane being provided in the ultrafiltration cartridge;

[0007] The forward and reverse flushing mechanism includes a push-pull plate provided on the outside of the water inlet and the water outlet, and a first fan plate and a second fan plate provided symmetrically. The first fan plate and the second fan plate rotate concentrically. When the push-pull plate moves, the first fan plate and the second fan plate move closer to or away from each other.

[0008] The flip mechanism includes a filter screen movably arranged on the inner wall of the water inlet. One end surface of the filter screen pre-filters the gas field water passing through the end surface. When the push-pull plate moves, the filter screen is driven to flip.

[0009] As a preferred solution of the gas field water ultrafiltration device described in the present invention, the first fan plate end face is provided with a first ring, a second ring is provided for rotation inside the first ring, and the midpoint of the second ring passes through the first ring and is connected to the second fan plate.

[0010] As a preferred embodiment of the gas field water ultrafiltration device of the present invention, the first sleeve rotates through the water inlet and is provided with a first support arm, the second sleeve rotates through the first sleeve and is provided with a second support arm, and the first support arm and the second support arm are symmetrically arranged with respect to the first sleeve;

[0011] A lower slider and an upper slider are respectively provided on the upper end surfaces of the first support arm and the second support arm. The second sleeve ring slides through the push-pull plate. Waist-shaped grooves are symmetrically provided on both sides of the push-pull plate.

[0012] As a preferred embodiment of the gas field water ultrafiltration device of the present invention, a limit frame is provided on one end of the push-pull plate, a limit block is provided on the end of the push-pull plate that slides into the limit frame, an opening groove is provided on the end surface of the limit frame, and the limit block is slidably arranged in the opening groove;

[0013] A centering column is provided at one end of the limiting block away from the push-pull plate. The centering column slides through the inner wall of the opening groove. A first elastic member is sleeved on the outer wall of the centering column.

[0014] As a preferred solution of the gas field water ultrafiltration device of the present invention, wherein: the end of the limit frame away from the limit block is provided with a rack, the forward and reverse flushing mechanism further comprises a fixed disk, and a rotating shaft is rotatably provided through the fixed disk;

[0015] A gear is sleeved on one end of the rotating shaft away from the fixed disk, and the gear is engaged with the two racks at the same time.

[0016] As a preferred embodiment of the gas field water ultrafiltration device of the present invention, the outer wall of the rotating shaft is further provided with a horizontal rod, the horizontal rod array is provided with two horizontal rods, and a vertical rod is provided between the two horizontal rods, and the horizontal rods and the vertical rods are rotatably spliced ​​to form a parallelogram frame;

[0017] The outer wall of the vertical rod is provided with a long strip, and the outer wall of the long strip is slidably sleeved with a cavity, and the cavity is a hollow shell and the inner wall of the cavity is slidably provided with a floating plate;

[0018] A floating rod is provided to slide through the floating plate, one end of the floating rod is provided with a delivery pipe, and a second elastic member is provided between the delivery pipe and the floating plate.

[0019] As a preferred solution of the gas field water ultrafiltration device described in the present invention, wherein: the inner wall of the water inlet is also fixedly provided with a support seat, the end face of the support seat is provided with a reversing ring, a V-shaped groove and a card groove are opened in the reversing ring, the end face of the filter is provided with a flip shaft, the end of the flip shaft away from the filter is provided with a runner, and the linear array of the runners is provided with two and is slidably arranged inside the V-shaped groove.

[0020] As a preferred solution of the gas field water ultrafiltration device of the present invention, the outer wall of the flip shaft is rotatably sleeved with a drive ring, the drive ring is rotatably sleeved on the support seat, and the outer wall of the drive ring is provided with a meshing worm gear.

[0021] As a preferred solution of the gas field water ultrafiltration device described in the present invention, a pulley is provided at one end of the worm gear's rotating shaft that rotates through the water inlet to the outside, and a pulley is also provided at one end of the second ring that rotates through the water inlet to the outside, and a transmission belt is provided on the outer walls of the two pulleys.

[0022] The beneficial effects of the gas field water ultrafiltration device of the present invention are as follows: when the pressure difference on both sides of a certain ultrafiltration cartridge is too large, the filtered gas field water is used for backwashing by changing the angle range of the first fan plate and the second fan plate, and the device automatically resets after the backwashing is completed, thereby realizing the function of automatic backwashing cleaning, and can be realized without disassembling or assembling external pipelines, without the need for external water pipes, reducing manual operation, and improving the service life of the ultrafiltration device; while backwashing cleaning, the filter screen is driven to flip, thereby achieving uniform cleaning of all surfaces of the filter screen, removing large particles of impurities on the surface, improving the overall cleaning effect, and extending the service life.

[0023] The present invention also discloses an ultrafiltration membrane monitoring method, the steps of the ultrafiltration membrane monitoring method are as follows:

[0024] S1. Install turbidity sensors and pressure sensors at the water inlet and outlet, and configure a DCS control system and data acquisition and recording system;

[0025] S2. Real-time monitoring: turbidity and pressure differential of inlet and outlet water are monitored in real time through turbidity sensors and pressure sensors. Real-time data is recorded in the data acquisition system to form a historical database.

[0026] S3. Set the transmembrane pressure difference and the effluent turbidity parameter trigger threshold for backwash cleaning. When the pressure difference is higher than the transmembrane pressure difference, the ultrafiltration cartridge is automatically backwashed by the gas field water ultrafiltration device and the backwash time and frequency data are recorded. When the effluent turbidity exceeds the effluent turbidity parameter trigger threshold, the DCS control system triggers the gas field water ultrafiltration device to backwash according to the preset cleaning time.

[0027] S4. Record the number and duration of backwash cleaning operations and calculate the backwash cleaning frequency. Set a warning threshold for the backwash cleaning frequency based on the operating conditions and historical data of the gas field water ultrafiltration device. When the backwash cleaning frequency exceeds the warning threshold, the DCS control system automatically issues a warning. Based on the backwash cleaning frequency and the operating data of the DCS control system, analyze whether the ultrafiltration membrane needs to be replaced or the equipment needs to be repaired.

[0028] S5. Perform maintenance and replacement. Regularly check the operating status of the gas field water ultrafiltration device according to early warning prompts and maintenance recommendations, perform maintenance operations, record the time, content and results of each maintenance operation, and form an equipment maintenance file; when the backwash cleaning frequency continues to be higher than the early warning threshold and the turbidity increases significantly, replace the ultrafiltration membrane.

[0029] The beneficial effects of the ultrafiltration membrane monitoring method of the present invention are as follows: the pressure sensor and the turbidity sensor are used to assist in determining the backwash trigger threshold, while recording the backwash cleaning time and frequency, analyzing whether replacement or maintenance is needed, giving early warning in time, and reducing cost losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0031] Figure 1 Schematic diagram of the overall gas field water ultrafiltration device of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of a single ultrafiltration cartridge in the present invention;

[0033] Figure 3Schematic diagram of the connection structure between the first fan plate and the second fan plate in the present invention;

[0034] Figure 4 Schematic diagram of the limit frame structure in the present invention;

[0035] Figure 5 Schematic diagram of the rotating shaft structure in the present invention;

[0036] Figure 6 Schematic diagram of the internal structure of the cavity in the present invention;

[0037] Figure 7 Schematic diagram of the water inlet pipe structure in the present invention;

[0038] Figure 8 Schematic diagram of the filter structure in the present invention;

[0039] Figure 9 This is a principle flow chart of the ultrafiltration membrane monitoring method of the present invention.

[0040] Reference numerals: 100, ultrafiltration cartridge; 101, water inlet; 102, water outlet; 103, aeration pipe; 104, water inlet pipe; 105, water outlet pipe;

[0041] 200, push-pull plate; 201, first sash; 2011, first collar; 2012, second collar; 2013, first support arm; 2014, second support arm; 2015, lower slider; 2016, upper slider; 2017, waist groove; 2018, limit frame; 2019, limit block; 202, second sash; 2021, opening groove; 2022, centering column; 2023, first elastic member; 2024, rack; 2025, fixed plate; 2026, rotating shaft; 2027, crossbar; 2028, vertical bar; 2031, cavity; 2032, floating plate; 2033, floating rod; 2034, delivery pipe; 2035, second elastic member; 2037, gear;

[0042] 300, filter screen; 301, support seat; 3011, reversing ring; 3012, V-shaped groove; 3013, card slot; 3014, flip shaft; 3015, rotating wheel; 3016, driving ring; 3017, pulley; 3018, transmission belt. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0045] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0046] Example 1

[0047] Reference Figures 1 to 8 , which is the first embodiment of the present invention, provides a gas field water ultrafiltration device, including an ultrafiltration mechanism, a forward and backwash mechanism, and a flip mechanism. When the pressure difference between the two sides of a certain ultrafiltration cartridge 100 is too large, the filtered gas field water is used for backwashing by changing the angle range of the first fan plate 201 and the second fan plate 202. After the backwash is completed, it automatically resets to realize the function of automatic backwash cleaning. This can be achieved without disassembling or assembling external pipelines, eliminating the need for external water pipes, reducing manual operations, and extending the service life of the ultrafiltration device.

[0048] Specifically, a gas field water ultrafiltration device includes:

[0049] The ultrafiltration mechanism includes an ultrafiltration cartridge 100, a water inlet 101 and a water outlet 102 provided on both sides of the outer wall of the ultrafiltration cartridge 100, an aeration pipe 103, a water inlet pipe 104 and a water outlet pipe 105 provided on the end surface of the ultrafiltration cartridge 100, the water inlet pipe 104 and the water outlet pipe 105 respectively connecting the water inlet 101 and the water outlet 102, and an ultrafiltration membrane provided in the ultrafiltration cartridge 100;

[0050] The forward and reverse flushing mechanism includes a push-pull plate 200, which is provided outside the water inlet 101 and the water outlet 102, and a first fan plate 201 and a second fan plate 202, which are symmetrically arranged. The first fan plate 201 and the second fan plate 202 rotate concentrically. When the push-pull plate 200 moves, the first fan plate 201 and the second fan plate 202 move closer to or away from each other.

[0051] The flip mechanism includes a filter screen 300 movably arranged on the inner wall of the water inlet 101. One end surface of the filter screen 300 pre-filters the gas field water passing through the end surface. When the push-pull plate 200 moves, the filter screen 300 is driven to flip.

[0052] Among them, there are 18 ultrafiltration cartridges 100 symmetrically arranged. The gas field water enters from the water inlet pipe 104 and then evenly enters the water inlet 101 of each ultrafiltration cartridge 100. After being filtered by the ultrafiltration membrane in the ultrafiltration cartridge 100, it flows out from the water outlet 102 and is collected into the water outlet pipe 105.

[0053] Among them, after working for a period of time, impurities in the ultrafiltration cartridge 100 will become blocked and affect the filtering effect and filtering efficiency. The ultrafiltration membrane in the ultrafiltration cartridge 100 needs to be cleaned and aerated and cleaned through the aeration pipe 103 to ensure the filtering effect of the ultrafiltration cartridge 100 and improve its service life.

[0054] Preferably, a first ring 2011 is provided on the end surface of the first fan plate 201 , a second ring 2012 is rotatably provided inside the first ring 2011 , and the midpoint of the second ring 2012 passes through the first ring 2011 and is connected to the second fan plate 202 .

[0055] Among them, the first fan plate 201 and the second fan plate 202 are both semicircular, and when the two are completely parallel to each other, they form a complete circular disk, and the outer wall of the circular disk fits with the inner wall of the water inlet 101 to prevent gas field water from entering the ultrafiltration cartridge 100 through the water inlet 101.

[0056] More preferably, the first ring 2011 rotates through the water inlet 101 and is provided with a first arm 2013 , the second ring 2012 rotates through the first ring 2011 and is sleeved with a second arm 2014 , and the first arm 2013 and the second arm 2014 are symmetrically arranged about the first ring 2011 .

[0057] The second ring 2012 and the first ring 2011 are arranged perpendicular to the axis of the water inlet 101, the first arm 2013 and the second arm 2014 are arranged perpendicular to the first ring 2011 and the second ring 2012 respectively, and the first arm 2013 and the second arm 2014 rotate in opposite directions.

[0058] Furthermore, a lower slider 2015 and an upper slider 2016 are respectively provided on the upper end surfaces of the first arm 2013 and the second arm 2014. The second ring 2012 slides through the push-pull plate 200. Waist-shaped grooves 2017 are symmetrically provided on both sides of the push-pull plate 200.

[0059] Among them, the lower slider 2015 and the upper slider 2016 slide into the waist-shaped groove 2017 from the upper and lower ends respectively and slide along the waist-shaped groove 2017. The direction of sliding along the waist-shaped groove 2017 is perpendicular to the direction of movement of the push-pull plate 200 along the second ring 2012.

[0060] Preferably, a limit frame 2018 is slidably sleeved on one end of the push-pull plate 200, and a limit block 2019 is provided on the end of the push-pull plate 200 that slides into the limit frame 2018. An opening groove 2021 is opened on the end face of the limit frame 2018, and the limit block 2019 is slidably set in the opening groove 2021.

[0061] A centering column 2022 is provided at one end of the limiting block 2019 away from the push-pull plate 200 . The centering column 2022 slides through the inner wall of the opening slot 2021 . A first elastic member 2023 is sleeved on the outer wall of the centering column 2022 .

[0062] Among them, the first elastic member 2023 is a spring, and is respectively connected to the inner wall of the opening groove 2021 and the outer wall of the limit block 2019, so that the limit block 2019 is always located at the center of the opening groove 2021 when the gas field water remains unchanged.

[0063] Furthermore, the limit frame 2018 drives the limit block 2019 to move synchronously through the first elastic member 2023. The length of the opening slot 2021 is the moving range of the limit block 2019 and the push-pull plate 200. As the limit frame 2018 and the opening slot 2021 move as a whole, the moving range of the push-pull plate 200 also changes, thereby changing the angle range in which the first fan plate 201 and the second fan plate 202 can rotate.

[0064] Among them, in the present invention, when the first fan plate 201 and the second fan plate 202 are simultaneously facing the side of the water inlet pipe 104 and overlap, the angle between the two is 0°. As the first fan plate 201 and the second fan plate 202 rotate, the angle gradually increases. When the two are simultaneously facing the side of the ultrafiltration cartridge 100 and overlap, the angle reaches the maximum, which is 360°.

[0065] Furthermore, the two forward and reverse flushing mechanisms located at the water inlet 101 and the water outlet 102 are symmetrically arranged, and the sum of the fan plate angles at the two locations is always 360°, and in the initial state, the angle at the water inlet 101 is 270°.

[0066] Preferably, a rack 2024 is provided at one end of the limit frame 2018 away from the limit block 2019 , and the forward and recoil mechanism further includes a fixed disk 2025 , in which a rotating shaft 2026 is provided for rotation.

[0067] More preferably, a gear 2037 is sleeved on one end of the rotating shaft 2026 away from the fixed disk 2025 , and the gear 2037 is engaged with the two racks 2024 at the same time.

[0068] Among them, the outer wall of the rotating shaft 2026 is also rotatably provided with a horizontal rod 2027, and there are two horizontal rods 2027 in an array. A vertical rod 2028 is also rotatably provided between the two horizontal rods 2027. The horizontal rod 2027 and the vertical rod 2028 are rotatably spliced ​​into a parallelogram frame.

[0069] Preferably, a long strip is provided on the outer wall of the vertical rod 2028, and a cavity 2031 is provided on the sliding sleeve of the outer wall of the long strip. The cavity 2031 is a hollow shell and a floating plate 2032 is provided on the inner wall for sliding.

[0070] Furthermore, a floating rod 2033 is provided to slide through the floating plate 2032 , a delivery pipe 2034 is provided at one end of the floating rod 2033 , and a second elastic member 2035 is provided between the delivery pipe 2034 and the floating plate 2032 .

[0071] Among them, the second elastic member 2035 is a spring, the delivery pipe 2034 is a hollow tube cavity, the floating rod 2033 is a hollow pipe and simultaneously connects the cavity 2031 and the delivery pipe 2034, and the floating plate 2032 is slidably arranged on the inner wall of the cavity 2031 and forms a closed cavity with it. After filling with gas field water, the greater the water pressure, the greater the distance the floating plate 2032 is pushed outward.

[0072] In summary, in the initial state, the opening and closing angle of the first fan plate 201 and the second fan plate 202 located at the water inlet 101 is 270°, and the opening and closing angle of the first fan plate 201 and the second fan plate 202 located at the water outlet 102 is 90°. When the floating rod 2033 located at the water inlet 101 moves toward the water outlet 102, the upper slider 2015 and the lower slider 2016 are driven to swing through the two waist-shaped grooves 2017, thereby driving the first fan plate 201 and the second fan plate 202 to rotate respectively through the first arm 2013 and the second arm 2014, so that the angle between the two is reduced. At the same time, at the symmetrically arranged water outlet 102, the first fan plate 201 and the second fan plate 202 rotate and the angles increase synchronously.

[0073] Among them, since the push-pull plate 200 slides in the opening groove 2021 through the limit block 2019, the reciprocating travel range of the push-pull plate 200 is limited. In the initial state of this embodiment, the opening and closing angles of the first fan plate 201 and the second fan plate 202 at the water inlet 101 are 180~270°, so that when the gas field water enters the water inlet 101 from the water inlet pipe 104, it impacts the obtuse angle surface formed by the two fan plates and keeps it at 270°. At this time, the water flow can flow normally. When the gas field water flows in the opposite direction, the water flow impacts the acute angle surface formed by the two fan plates, and pushes the fan plates to rotate to 180° and blocks the water inlet 101, forming a one-way conduction. Similarly, the fan plate located at the water outlet 102 allows the filtered gas field water to only flow out and cannot flow back.

[0074] At the same time, when the ultrafiltration membrane in a certain ultrafiltration cartridge 100 is blocked by more than 50%, the filtration efficiency of the ultrafiltration cartridge 100 is reduced, resulting in an increase in the pressure difference of the gas field water at the inlet and outlet of the ultrafiltration cartridge 100, and the greater the degree of blockage, the greater the pressure difference. At the same time, the gas field water at the two places enters the cavity 2031 along the delivery pipe 2034 and the floating rod 2033. At the same time, the two cavities 2031 respectively connected to the inlet and outlet of the gas field water form a lever around the rotating shaft 2026. When the pressure difference becomes larger, the cross bar 2027 connected to the rotating shaft 2026 drives the rotating shaft 2026 to rotate around the axis, so that the gear 2037 drives the limit frame 2018 to move through the symmetrically arranged rack 2024, thereby changing the stroke of the push-pull plate 200, and the opening range between the fan plates also changes accordingly, and the water outlet 102 The opening and closing angles of the first fan plate 201 and the second fan plate 202 are 180 to 270 degrees, and the direction of the gas field water passing through is changed, so that the filtered gas field water filtered by other normally working ultrafiltration cartridges 100 enters along the water outlet 102 of the blocked ultrafiltration cartridge 100, and the opening and closing angles of the first fan plate 201 and the second fan plate 202 at the water inlet 101 are 90 to 180 degrees, so that the filtered gas field water passes through the ultrafiltration cartridge 100 and the ultrafiltration membrane therein is backwashed and cleaned, and the cleaned impurities enter the water inlet pipe 104 from the water inlet 101 and are filtered by other normally working ultrafiltration cartridges 100. After the filtration is completed, the pressure difference decreases and the device automatically resets, so that the filter device has the function of automatic backwash cleaning, and it can be achieved without disassembling the external pipeline, which is simple and convenient and improves the service life.

[0075] Example 2

[0076] Reference Figures 1 to 8 , which is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but the difference is that the filter 300 is turned over while backflushing, so as to achieve uniform cleaning of all surfaces of the filter 300, remove large particles of impurities on the surface, improve the overall cleaning effect, and extend the service life.

[0077] Specifically, a support seat 301 is fixedly provided on the inner wall of the water inlet 101, a reversing ring 3011 is provided on the end face of the support seat 301, a V-shaped groove 3012 and a card groove 3013 are opened in the reversing ring 3011, a flip shaft 3014 is provided on the end face of the filter 300, and a rotating wheel 3015 is provided on the end of the flip shaft 3014 away from the filter 300. There are two rotating wheels 3015 in a linear array and they are slidably arranged inside the V-shaped groove 3012.

[0078] Among them, the filter screen 300 is fan-shaped with an arc of 59°. Six filter screens 300 are assembled into a complete filter screen to pre-filter large particles of impurities in the gas field water. The tip of the V-shaped groove 3012 is close to the support seat 301 and connected to the card slot 3013.

[0079] Among them, the wheel 3015 rotates along the upper end surface of the reversing ring 3011 in the initial state. When a single wheel 3015 slides downward along the V-shaped groove 3012 and engages into the slot 3013, the other wheel 3015 continues to roll along the upper end surface of the reversing ring 3011, thereby driving the filter 300 to flip.

[0080] Furthermore, a driving ring 3016 is rotatably sleeved on the outer wall of the flip shaft 3014 , and the driving ring 3016 is rotatably sleeved on the support seat 301 , and an outer wall of the driving ring 3016 is provided with a meshing worm gear.

[0081] Preferably, a pulley 3017 is provided at one end of the worm gear's rotating shaft that passes through the water inlet 101 to the outside, and a pulley 3017 is also provided at one end of the second ring 2012 that passes through the water inlet 101 to the outside. A transmission belt 3018 is provided on the outer walls of the two pulleys 3017.

[0082] In summary, when the ultrafiltration cartridge 100 is backflushing cleaned, the second ring 2012 rotates, driving the pulley 3017 to rotate through the transmission belt 3018, thereby rotating the drive ring 3016 through the worm gear, so that the runner 3015 rotates along the upper end surface of the reversing ring 3011. When the runner 3015 moves to the V-shaped groove 3012, it sinks and slides down along the V-shaped groove 3012 and engages into the slot 3013. At the same time, the other runner 3015 continues to slide along the reversing ring 3011, and after moving out of the V-shaped groove 3012 area, it drives the engaged runner 3015 to disengage from the slot 3013 and slide out along another channel of the V-shaped groove 3012, thereby realizing the flipping of the flip shaft 3014.

[0083] At the same time, the filter screen 300 connected to the flip shaft 3014 also flips over, and the backwash water flows and flushes the filter screen 300 at all angles, flushing out large particles and simultaneously cleaning the filter screen 300.

[0084] Example 3

[0085] Reference Figures 1 to 9 , which is the third embodiment of the present invention, provides an ultrafiltration membrane monitoring method. The method is implemented based on the above-mentioned gas field water ultrafiltration device, and uses a pressure sensor and a turbidity sensor to assist in judging the backwash trigger threshold. At the same time, the backwash cleaning time and frequency are recorded to analyze whether replacement or maintenance is needed, and timely warnings are issued to reduce cost losses.

[0086] Specifically, a method for monitoring an ultrafiltration membrane includes:

[0087] S1. Install a turbidity sensor and a pressure sensor at the water inlet 101 and the water outlet 102 of the ultrafiltration cartridge 100, respectively, and configure a DCS control system and a data acquisition and recording system.

[0088] S2. Carry out real-time monitoring, using turbidity sensors and pressure sensors to monitor the turbidity and pressure difference of the inlet and outlet water in real time, and record the real-time data into the data acquisition system to form a historical database.

[0089] S3. Set the transmembrane pressure difference and effluent turbidity parameter trigger thresholds for backwash cleaning in the DCS control system. When the pressure difference is higher than the transmembrane pressure difference, use the forward and backwash mechanisms to automatically backwash the ultrafiltration cartridge 100 and record the backwash time and frequency data. When the effluent turbidity exceeds the effluent turbidity parameter trigger threshold, the DCS control system triggers the gas field water ultrafiltration device to backwash according to the preset cleaning time.

[0090] S4. After each backwash cleaning is triggered, the DCS control system records a backwash cleaning operation, the number of backwash cleanings and the time, and calculates the backwash cleaning frequency. Based on the operating status and historical data of the gas field water ultrafiltration device, an early warning threshold for the backwash cleaning frequency is set. When the backwash cleaning frequency exceeds the early warning threshold, the DCS control system automatically issues an early warning prompt to remind the operator to check the operation of the gas field water ultrafiltration device. Based on the backwash cleaning frequency and the operating data of the DCS control system, it analyzes whether the ultrafiltration membrane needs to be replaced or the equipment needs to be repaired, and generates a maintenance recommendation report.

[0091] S5. Perform maintenance and replacement. Regularly check the operating status of the gas field water ultrafiltration device according to early warning prompts and maintenance recommendations, perform maintenance operations, record the time, content and results of each maintenance operation, and form a maintenance file for the gas field water ultrafiltration device; when the backwash cleaning frequency continues to be higher than the early warning threshold and the filtration effect is significantly reduced, consider replacing the ultrafiltration membrane.

[0092] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, directional changes, etc.) without departing substantially from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structures. Other replacements, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0093] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A gas field water ultrafiltration device, characterized in that: include: An ultrafiltration mechanism comprises an ultrafiltration cartridge (100), a water inlet (101) and a water outlet (102) provided on both sides of the outer wall of the ultrafiltration cartridge (100), an aeration pipe (103) provided on the end surface of the ultrafiltration cartridge (100), a water inlet pipe (104) and a water outlet pipe (105), wherein the water inlet pipe (104) and the water outlet pipe (105) are respectively connected to the water inlet (101) and the water outlet (102), and an ultrafiltration membrane is provided in the ultrafiltration cartridge (100); The forward and reverse flushing mechanism comprises a push-pull plate (200) provided outside the water inlet (101) and the water outlet (102), a first fan plate (201) and a second fan plate (202) provided symmetrically, wherein the first fan plate (201) and the second fan plate (202) rotate concentrically, and when the push-pull plate (200) moves, the first fan plate (201) and the second fan plate (202) are driven to move closer to or farther from each other; The flip mechanism comprises a filter screen (300) movably arranged on the inner wall of the water inlet (101), one end surface of the filter screen (300) pre-filtering the gas field water passing through the end surface, and the push-pull plate (200) drives the filter screen (300) to flip when moving.

2. The gas field water ultrafiltration device according to claim 1, characterized in that: The end surface of the first fan plate (201) is provided with a first ring (2011), a second ring (2012) is rotatably provided inside the first ring (2011), and the midpoint of the second ring (2012) passes through the first ring (2011) and is connected to the second fan plate (202).

3. The gas field water ultrafiltration device according to claim 2, characterized in that: The first ring (2011) rotates through the water inlet (101) and is provided with a first support arm (2013); the second ring (2012) rotates through the first ring (2011) and is provided with a second support arm (2014); the first support arm (2013) and the second support arm (2014) are symmetrically arranged with respect to the first ring (2011); The upper end surfaces of the first support arm (2013) and the second support arm (2014) are respectively provided with a lower slider (2015) and an upper slider (2016); the second ring (2012) slides through the push-pull plate (200); and waist-shaped grooves (2017) are symmetrically provided on both sides of the push-pull plate (200).

4. The gas field water ultrafiltration device according to claim 3, characterized in that: A limit frame (2018) is slidably sleeved on one end of the push-pull plate (200), a limit block (2019) is provided on the end of the push-pull plate (200) that slides into the limit frame (2018), an opening groove (2021) is formed on the end surface of the limit frame (2018), and the limit block (2019) is slidably arranged in the opening groove (2021); A centering column (2022) is provided at one end of the limit block (2019) away from the push-pull plate (200), and the centering column (2022) slides through the inner wall of the opening groove (2021), and the outer wall of the centering column (2022) is sleeved with a first elastic member (2023).

5. The gas field water ultrafiltration device according to claim 4, characterized in that: A rack (2024) is provided at one end of the limit frame (2018) away from the limit block (2019), and the forward and reverse impact mechanism further comprises a fixed disk (2025), wherein a rotating shaft (2026) is provided in the fixed disk (2025) for rotation and penetration; A gear (2037) is sleeved on one end of the rotating shaft (2026) away from the fixed disk (2025), and the gear (2037) is simultaneously engaged with the two racks (2024).

6. The gas field water ultrafiltration device according to claim 5, characterized in that: The outer wall of the rotating shaft (2026) is also provided with a horizontal rod (2027) which is rotatably sleeved, and an array of two horizontal rods (2027) is provided, and a vertical rod (2028) is also rotatably provided between the two horizontal rods (2027), and the horizontal rod (2027) and the vertical rod (2028) are rotatably spliced ​​to form a parallelogram frame; The outer wall of the vertical rod (2028) is provided with a long strip, and the outer wall of the long strip is slidably covered with a cavity (2031), and the cavity (2031) is a hollow shell and the inner wall of the cavity is slidably provided with a floating plate (2032); A floating rod (2033) is provided slidingly through the floating plate (2032), a delivery pipe (2034) is provided at one end of the floating rod (2033), and a second elastic member (2035) is provided between the delivery pipe (2034) and the floating plate (2032).

7. The gas field water ultrafiltration device according to claim 6, characterized in that: The inner wall of the water inlet (101) is further fixedly provided with a support seat (301), the end surface of the support seat (301) is provided with a reversing ring (3011), a V-shaped groove (3012) and a clamping groove (3013) are provided in the reversing ring (3011), the end surface of the filter (300) is provided with a turning shaft (3014), the end of the turning shaft (3014) away from the filter (300) is provided with a rotating wheel (3015), and two rotating wheels (3015) are provided in a linear array and are slidably arranged inside the V-shaped groove (3012).

8. The gas field water ultrafiltration device according to claim 7, characterized in that: The outer wall of the flip shaft (3014) is rotatably sleeved with a driving ring (3016), and the driving ring (3016) is rotatably sleeved on the support seat (301), and the outer wall of the driving ring (3016) is provided with a meshing worm gear.

9. The gas field water ultrafiltration device according to claim 8, characterized in that: A pulley (3017) is provided at one end of the worm gear's rotating shaft that passes through the water inlet (101) to the outside, and a pulley (3017) is also provided at one end of the second ring (2012) that passes through the water inlet (101) to the outside. A transmission belt (3018) is sleeved on the outer walls of the two pulleys (3017).

10. A method for monitoring an ultrafiltration membrane, implemented based on a gas field water ultrafiltration device according to any one of claims 1 to 9, characterized in that: include: S1. Install turbidity sensors and pressure sensors at the water inlet (101) and outlet (102), configure a DCS control system and data acquisition and recording system; S2. Real-time monitoring: turbidity and pressure differential of inlet and outlet water are monitored in real time through turbidity sensors and pressure sensors. Real-time data is recorded in the data acquisition system to form a historical database. S3. Setting the transmembrane pressure difference and the effluent turbidity parameter trigger threshold for backwash cleaning. When the pressure difference between the inlet and outlet water is higher than the transmembrane pressure difference, the ultrafiltration cartridge (100) is automatically backwashed and cleaned by the gas field water ultrafiltration device. When the turbidity of the effluent water exceeds the effluent turbidity parameter trigger threshold, the DCS control system triggers the gas field water ultrafiltration device to perform backwash cleaning according to the preset cleaning time. S4. Record the number and time of backwash cleaning operations and calculate the backwash cleaning frequency; set a warning threshold for the backwash cleaning frequency based on the operating status and historical data of the gas field water ultrafiltration device. When the backwash cleaning frequency exceeds the set warning threshold, the DCS control system automatically issues a warning prompt. Based on the backwash cleaning frequency and the operating data of the DCS control system, analyze whether it is necessary to replace the ultrafiltration membrane or perform equipment maintenance; S5. Perform maintenance and replacement. Regularly check the operating status of the gas field water ultrafiltration device according to the early warning prompts and maintenance recommendations, perform maintenance operations, record the time, content and results of each maintenance operation, and form an equipment maintenance file; when the backwash cleaning frequency continues to be higher than the early warning threshold and the turbidity increases significantly, replace the ultrafiltration membrane.

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