An offshore platform polymer dry powder sealing anti-agglomeration on-line unloading and dispersing device and method

Abstract

The application discloses an online unloading and dispersing device for polymer dry powder of offshore platforms, which is composed of an isolation liquid pool module, a feeding module, a dispersing module and an isolation liquid recycling module. In the isolation liquid pool module, the dry powder enters the bin containing the isolation liquid through the unloading hopper, filter screen and uniform speed unloading belt, and is wrapped and isolated from the air by the isolation liquid. The feeding module quantitatively transports the dry powder-isolation liquid mixture to the low-pressure liquid distribution pipe through the conveying pump. The dispersing module realizes the separation of the isolation liquid and the dry powder through the X-shaped stirrer. The isolation liquid recycling module recycles the separated isolation liquid to the bin through the liquid collecting pipe and the backflow pipe. The application realizes the whole-process closed anti-agglomeration operation of the dry powder unloading and liquid distribution, effectively isolates the contact between the humid air, oxygen and the polymer dry powder, effectively avoids the agglomeration and hardening in the polymer solution preparation process, reduces the generation of "fish eyes", and effectively improves the polymer liquid distribution quality by oxygen isolation.

Description

Technical Field

[0001] This invention relates to the fields of marine oil and gas development and petroleum engineering technology, and more particularly to a closed-loop anti-agglomeration online feeding and dispersing device and method for polymer dry powder on offshore platforms. Background Technology

[0002] In enhanced oil recovery (EOR) operations in offshore oilfields, such as polymer flooding and profile control / displacement, which primarily utilize chemical dry powder agents, it is necessary to mix polymer dry powder with water to prepare a polymer mother liquor with a certain viscosity. This mother liquor is then diluted according to the design plan to form the target liquid before being injected into the formation to enhance oil recovery and control water and oil production. The closed-loop feeding and uniform dispersion of the polymer dry powder are key aspects of the liquid preparation process.

[0003] Currently, polymer dispensing systems on offshore platforms commonly employ pneumatic conveying or water jetting to dispose of and pre-disperse dry powder. Pneumatic conveying utilizes compressed air or blower-generated airflow to transport dry powder from the hopper to the mixer via a Venturi ejector. For example, Chinese patent application CN118079701A discloses a spiral pulse polymer dispersion device that uses a pneumatic conveying system to transport polymer powder from the hopper through a Venturi tube to the mixing chamber at the top of the dissolving tank, where it comes into contact with a spiral umbrella-shaped water jet. This umbrella-shaped spiral jet improves the uniformity and dispersion of the dry powder and water. Furthermore, Chinese patent application CN211562824U discloses a material dissolving auxiliary mechanism that uses pneumatic conveying through a feed pipe, combined with water jets or mist sprayed from the side wall inlets, to improve the dispersion of the polymer powder under pneumatic conveying conditions and prevent agglomeration when the powder comes into contact with water. However, pneumatic conveying has the following problems in practical offshore applications: First, during the airflow process, the polymer powder comes into direct contact with the humid air at sea, and the prolonged steaming and re-emergence of water vapor from the high-temperature liquid preparation process easily leads to moisture absorption and agglomeration of the powder, making it difficult to disperse. Second, the system requires a high-power blower, resulting in high energy consumption and occupying a small working area on the platform. Third, there is a risk of dust spillage, which harms the environment and the health of operators, and it is also prone to continuously carrying air, especially oxygen, into the liquid preparation process and underground, which can cause tank overflow or loss of polymer performance. Currently, pneumatic conveying is rarely used in offshore chemical flooding.

[0004] Another waterjet feeding method utilizes high-pressure water flow to generate negative pressure through an injector, drawing in dry powder and mixing it with water. Chinese patent application CN211274251U discloses a high-efficiency dispersion and dissolution device for polymer waterjet in offshore oil fields, which uses a waterjet injector in conjunction with a static mixer to achieve dispersion and dissolution of dry powder. However, the waterjet method also faces challenges: firstly, the dry powder is still in contact with air during the feeding process, and the humid marine environment and high-temperature liquid preparation water vapor backflow can easily cause the dry powder to absorb moisture and clump together at the feed hopper or injector inlet, forming clumps; secondly, the waterjet's ability to disperse already agglomerated clumps is limited, and they are prone to forming "fisheyes" after entering the subsequent liquid preparation device.

[0005] Neither pneumatic nor water jet methods can fully achieve complete closed-loop isolation during the dry powder feeding process. When in contact with air and water vapor, polymer dry powder readily absorbs moisture, causing agglomeration and caking on the surface, forming solid clumps of varying sizes. Once these clumps enter the subsequent solution preparation unit and maturation tank, they easily form translucent, large "fish-eye" particles, not only reducing the effective concentration of the polymer solution but also clogging the polymer injection pump and injection pipelines, affecting solution quality. In particular, clogging the downhole sand control screen will cause artificially high injection pressure, exacerbate near-wellbore shear, and severely impact the performance of the polymer solution and the oil displacement effect.

[0006] To address the aforementioned issues, existing technologies attempt to employ nitrogen-sealed systems to isolate the polymer from air. For example, Chinese patent application CN205577966U discloses a high-efficiency sealed polymer dry powder dispersion, dissolution, and curing system. This system connects a nitrogen generator to a feeding system, a mixer, and a curing tank, forming a nitrogen-sealed system designed to prevent oxygen from entering and causing polymer degradation. However, this approach primarily addresses the degradation of polymers by oxygen (specifically for wastewater preparation scenarios), and struggles to solve the problem of dry powder agglomeration and caking caused by humid air or high-temperature water vapor during preparation. Furthermore, the introduction of nitrogen can also lead to bubble formation in the preparation, resulting in a large number of bubbles in the mother liquor, affecting the viscosity of the target liquid and the quality of the prepared solution. In addition, nitrogen generators require a large footprint and consume a lot of energy, making them difficult to implement on space-constrained offshore platforms.

[0007] In summary, how to achieve fully enclosed and uniform dispersion of polymer dry powder in a high-humidity marine environment, fundamentally avoiding agglomeration and "fish-eye" problems caused by contact between dry powder and humid air, and improving the quality of polymer solution preparation, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0008] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a closed-loop anti-agglomeration online feeding and dispersing device and method for polymer dry powder on offshore platforms, aiming to solve the technical problems such as the lack of closed-loop operation and uneven dispersion in the existing pneumatic or water jet feeding process, and the polymer dry powder absorbing moisture and agglomerating and caking due to the humid marine environment or high-temperature liquid preparation water vapor, producing the "fish-eye" phenomenon, which seriously affects the quality of liquid preparation.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a closed-loop anti-agglomeration online dispensing and dispersing device for polymer dry powder on offshore platforms, comprising: The isolation liquid tank module includes a hopper, a silo, and an isolation liquid supply system. The hopper is located above the silo, which contains isolation liquid. Polymer dry powder falls into the silo through the hopper and is coated by the isolation liquid to form a dry powder-isolation liquid mixture. The feeding module includes a conveying pump and a low-pressure dispensing water pipe. The inlet of the conveying pump is connected to the bottom outlet of the silo, and the outlet of the conveying pump is connected to the low-pressure dispensing water pipe, for quantitatively conveying the dry powder-isolation liquid mixture into the low-pressure dispensing water pipe. The dispersion module includes a separation chamber, a stirrer built into the separation chamber, and a drive motor connected to the stirrer. The separation chamber is connected downstream of the low-pressure dispensing water pipe and is used to receive the three-phase mixture formed by mixing the dry powder-isolation liquid mixture with the low-pressure dispensing water, and to separate the isolation liquid from the polymer dry powder through the stirring action of the stirrer. The isolation fluid recovery and circulation module includes a liquid collection pipe and a liquid return pipe. The inlet end of the liquid collection pipe is connected to the top outlet of the separation chamber, and the outlet end of the liquid collection pipe is connected to the silo through the liquid return pipe, for recycling the separated isolation fluid back to the silo.

[0010] Preferably, the isolation liquid pool module further includes two uniform speed feeding belts installed at an angle above the interior of the silo, with a gap maintained between the two uniform speed feeding belts. The uniform speed feeding belts are of a tracked structure, and the outer side of the uniform speed feeding belts is provided with protruding partitions. The polymer dry powder is driven to leak uniformly into the isolation liquid in the silo by the rotation of the track.

[0011] Preferably, the hopper is an inverted frustum shape, and a filter screen is embedded in the lower part of the hopper. The mesh size of the filter screen is no higher than 10 mesh, which is used to filter solid impurities or lumps in the polymer dry powder.

[0012] Preferably, the isolation fluid supply system includes an isolation fluid inlet / outlet pipe, an isolation fluid inlet / outlet pump valve, and an isolation fluid storage tank. One end of the isolation fluid inlet / outlet pipe is connected to the silo, and the other end is connected to the isolation fluid storage tank. The isolation fluid inlet / outlet pipe is equipped with an isolation fluid inlet / outlet pump valve that has a bidirectional pumping function.

[0013] Preferably, the silo is provided with transparent monitoring windows on both sides, and an upper isolation liquid level monitor and a lower isolation liquid level monitor are respectively installed at the upper and lower transparent monitoring windows on one side of the silo. The upper isolation liquid level monitor and the lower isolation liquid level monitor are electrically connected to the isolation liquid inlet and outlet pump valve. When the isolation fluid interface drops to the lower level, the isolation fluid inlet / outlet pump valve is opened to replenish the isolation fluid from the isolation fluid storage tank into the silo; when the isolation fluid interface rises to the upper level, the isolation fluid inlet / outlet pump valve is opened to output in the reverse direction, discharging the isolation fluid from the silo into the isolation fluid storage tank.

[0014] Preferably, an upper dry powder accumulation interface monitor and a lower dry powder accumulation interface monitor are installed at the upper and lower transparent monitoring windows on the other side of the silo, respectively, to monitor the upper and lower interfaces of the polymer dry powder accumulation body in the silo. When the polymer dry powder accumulation rises to the upper interface, an alarm is triggered and feeding from the hopper is stopped; when the polymer dry powder accumulation falls to the lower interface, an alarm is triggered and feeding from the hopper is accelerated.

[0015] Preferably, the separation chamber has a structure in which the lower half is cylindrical and the upper half is a dome-shaped cavity; the downstream of the low-pressure liquid distribution pipe is connected to one side of the lower half of the separation chamber, and the other side of the lower half of the separation chamber is connected to a mixing liquid pipeline; the agitator consists of a pair of X-shaped stirring blades, the stirring blades are nearly rectangular, their lower parts are close to the bottom of the separation chamber, and their sides are close to the lower half of the separation chamber.

[0016] Preferably, the liquid receiving pipe is provided with three transparent monitoring windows on one side: upper, middle, and lower. The upper recovery isolation liquid level monitor, the middle recovery isolation liquid level monitor, and the lower recovery isolation liquid level monitor are respectively installed. The upper, middle, and lower recovery isolation liquid level monitors are electrically connected to the solenoid valves provided on the return drain pipe. When the level of the isolation fluid in the receiving tube drops to the lower level, the solenoid valve is fully open; when the isolation fluid interface reaches the middle level, the solenoid valve is half open; when the isolation fluid interface rises to the upper level, the solenoid valve is fully closed; when the isolation fluid level is between the upper, middle, and lower discrete thresholds, the opening of the solenoid valve is linearly adjusted proportionally to make the isolation fluid interface approach the middle level.

[0017] Preferably, the low-pressure liquid distribution pipe is provided with a liquid inlet for realizing a dual feeding mode of dry powder and liquid materials on the feeding and dispersing device; the isolation liquid is a liquid that is insoluble in water and has a density less than water, and is selected from white oil.

[0018] Secondly, the present invention provides a closed-loop, anti-agglomeration online dispersion method for polymer dry powder on offshore platforms, employing the apparatus described in the first aspect of the present invention, comprising the following steps: The polymer dry powder is added from the hopper, sprinkled onto the uniform feeding belt through the filter screen, and then leaked into the hopper under the action of the uniform feeding belt, where it accumulates at the bottom of the hopper. As the polymer dry powder leaks down to the bottom of the silo, it gradually disperses in the isolation liquid in the silo, forming a dry powder-isolation liquid mixture. The dry powder-isolation fluid mixture is quantitatively added to the low-pressure solution water pipe by a delivery pump and mixed with the low-pressure solution water to form an isolating fluid-water-polymer three-phase mixture. The three-phase mixture is fed into the separation chamber, where the separation liquid and polymer dry powder are separated by the stirring, centrifugal rotation, and directional pushing action of the agitator. Due to the density difference, the separated liquid moves upward along the liquid collection pipe under the action of gravity and enters the silo through the return liquid pipe, realizing the recycling of the separated liquid. At the same time, the separated polymer dry powder and low-pressure liquid preparation water enter the mixing liquid pipeline.

[0019] The present invention has the following advantages due to the adoption of the above technical solutions: 1. Fully enclosed process, completely airtight, moisture-proof and agglomeration-proof: The dry powder is encapsulated by the isolation liquid as soon as it enters the silo, completely isolating it from humid air, preventing moisture absorption and caking and the formation of "fish eyes", fundamentally solving the technical problem of polymer dry powder agglomeration in the high humidity environment at sea.

[0020] 2. Uniform dispersion and improved solution quality: Due to the dispersing effect of the isolating liquid, the dry powder particles can be uniformly dispersed. After entering the low-pressure solution, it can reduce the problem of uneven dissolution caused by the agglomeration of dry powder particles. Moreover, due to the pump pressure of the delivery pump and the incompatibility design between the isolating liquid and the solution, the dry powder mixture can be added online, and the pump inlet caking caused by the high temperature of the low-pressure solution water vapor can be prevented.

[0021] 3. Compact design, suitable for offshore platforms: No auxiliary equipment such as nitrogen generators and large air compressors are required. It occupies a small area, is lightweight, and has little impact on the platform load, making it particularly suitable for offshore platform environments with limited space.

[0022] 4. The isolation fluid is recyclable: The isolation fluid plays a role in isolation and dispersion. Before entering the liquid preparation equipment, it is collected and recycled in large quantities by the dispersion module. The amount that enters the solution and even the formation is small, which has little impact on the performance of the polymer solution and the reservoir. Moreover, the loss is small, which reduces operating costs.

[0023] 5. High adaptability: This invention is compatible with existing polymer solution preparation processes, and its modular design makes it easy to modify. It can be flexibly adapted to solution preparation systems of different sizes of offshore platforms.

[0024] 6. Intelligent control: It integrates multiple sensors such as liquid level and flow rate to realize intelligent control of dry powder feeding and mixture feeding, supports remote operation and unmanned on-site operation, and improves the level of automation. Attached Figure Description

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings: Figure 1 This is a schematic diagram of the structure of a closed anti-agglomeration online dispensing and dispersing device for polymer dry powder on offshore platforms provided in an embodiment of the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0032] The present invention provides a closed-loop anti-agglomeration online dispensing and dispersion device for polymer dry powder on offshore platforms, comprising an isolation liquid tank module, a feeding module, a dispersion module, and an isolation liquid recovery and circulation module. In the isolation liquid tank module, dry powder enters a hopper containing isolation liquid via a hopper, filter screen, and uniform feeding belt, where it is enveloped by the isolation liquid and isolated from air. The feeding module uses a pump to quantitatively deliver the dry powder-isolation liquid mixture to a low-pressure dispensing water pipe. The dispersion module uses an X-type agitator to separate the isolation liquid from the dry powder. The isolation liquid recovery and circulation module returns the separated isolation liquid to the hopper for recycling via a collection pipe and a return pipe. This invention achieves a fully closed-loop anti-agglomeration operation from dry powder dispensing to dispensing, effectively isolating the polymer dry powder from humid air and oxygen, thus effectively preventing agglomeration and caking during polymer solution preparation, reducing the formation of "fish eyes," and effectively improving the quality of polymer solution preparation through oxygen isolation.

[0033] The following is a detailed description, with reference to the accompanying drawings, of the closed-loop anti-agglomeration online feeding and dispersing device and method for polymer dry powder on offshore platforms provided by embodiments of the present invention.

[0034] Example 1 like Figure 1 As shown in the figure, this embodiment provides a closed anti-agglomeration online dispersing device for polymer dry powder on offshore platforms, including an isolation liquid pool module, a feeding module, a dispersing module, and an isolation liquid recovery and circulation module.

[0035] The isolation liquid tank module includes a hopper 1, a filter screen 2, a uniform feeding belt 3, a silo 4, an isolation liquid inlet / outlet pump valve 14, an isolation liquid inlet / outlet pipe 15, and an isolation liquid supply tank 16. The hopper 1 is an inverted frustum-shaped cone, with its upper opening for feeding polymer powder. The filter screen 2 is embedded in the lower part of the hopper 1 to filter larger solid impurities or lumps in the polymer powder. The hopper 1 is bolted to the upper part of the silo 4, which is an inverted cone-shaped structure. Two tracked uniform feeding belts 3 are installed at an angle at the top inside the silo, with a certain gap between them. The rotation of the belts drives the polymer powder to be fed uniformly into the silo 4 and evenly dispersed into the isolation liquid within the silo 4. An isolation liquid inlet / outlet pipe 15 is located on the side of the silo 4, one end of which is connected to the silo 4 by welding or a flange, and the other end is connected to the isolation liquid storage tank 16 by welding or a flange. The isolation fluid inlet / outlet pump valve 14 is installed on the isolation fluid inlet / outlet pipe 15 and has a bidirectional pumping function.

[0036] The feeding module includes a conveying pump 5 and a low-pressure dispensing water pipe 7. One end of the conveying pump 5 is connected to the bottom opening of the silo 4, and the other end is connected to the low-pressure dispensing water pipe 7. It is used to quantitatively convey the mixture of polymer dry powder and isolation liquid in the silo 4 into the low-pressure dispensing water pipe 7. The low-pressure dispensing water pipe 7 is connected upstream to the platform dispensing water system and downstream to the dispersion module.

[0037] The dispersion module includes a separation chamber 9, a stirrer 10, and a drive motor 6. The separation chamber 9 has a cylindrical lower half and a domed upper half. The low-pressure dispensing water pipe 7 is connected downstream to one side of the lower half of the separation chamber 9 via a flange, and the mixing liquid pipeline 11 is connected to the other side of the lower half of the separation chamber 9 via a flange. The stirrer 10 is built into the lower half of the separation chamber 9 and consists of a pair of X-shaped stirring blades. The drive motor 6 is used to drive the stirrer 10 to rotate, thereby separating the separation liquid from the polymer dry powder.

[0038] The isolation fluid recovery and circulation module includes a liquid receiving pipe 12 and a liquid return pipe 24. The inlet end of the liquid receiving pipe 12 is connected to the top outlet of the separation chamber 9, and the outlet end of the liquid receiving pipe 12 is connected to the hopper 4 via the liquid return pipe 24. The liquid return pipe 24 is equipped with an adjustable solenoid valve 23.

[0039] In the above embodiment, preferably, two transparent monitoring windows, one upper and one lower, are provided on both sides of the silo 4. An upper isolation liquid level monitor 13 and a lower isolation liquid level monitor 17 are respectively installed at the upper and lower transparent monitoring windows on one side of the silo 4 to monitor the upper and lower interfaces of the isolation liquid level in the silo 4, and are electrically connected to the pump valve 14 on the isolation liquid inlet / outlet pipe 15: when the isolation liquid interface drops to the lower level, the pump valve 14 is opened to pump the isolation liquid from the isolation liquid storage tank 16 to replenish the silo 4; when the isolation liquid interface rises to the upper level, the pump valve 14 is opened to output in reverse, and the isolation liquid is discharged from the silo 4 to the isolation liquid supply tank 16.

[0040] In the above embodiments, preferably, an upper dry powder accumulation interface monitor 18 and a lower dry powder accumulation interface monitor 19 are installed at the upper and lower transparent monitoring windows on the other side of the silo 4 to monitor the upper and lower interfaces of the polymer dry powder accumulation in the silo 4: when the polymer dry powder accumulation rises to the upper interface, an alarm is triggered and feeding from the hopper 1 is stopped; when the polymer dry powder accumulation falls to the lower interface, an alarm is triggered and feeding from the hopper 1 is accelerated.

[0041] In the above embodiment, preferably, the receiving pipe 12 is provided with three transparent monitoring windows (upper, middle, and lower) on one side, each equipped with an upper recovery isolation liquid level monitor 20, a middle recovery isolation liquid level monitor 21, and a lower recovery isolation liquid level monitor 22, respectively. These windows are used to monitor the isolation liquid level in the receiving pipe 12 and are electrically connected to a solenoid valve 23 on the return drain pipe. When the isolation liquid level in the receiving pipe 12 drops to the lower level, the solenoid valve 23 fully opens (100% opening) to quickly discharge the isolation liquid, preventing it from being discharged with the mixed liquid pipeline 11. When the isolation liquid interface in the receiving pipe 12... When the liquid level reaches the middle level, the solenoid valve 23 is half-open (50% opening) to maintain the discharge rate of the isolation liquid in the receiving pipe 12 equal to the inflow rate, and to regulate the isolation liquid interface to stabilize near the middle level, thus achieving self-balancing. When the isolation liquid interface in the receiving pipe 12 rises to the upper level, the solenoid valve 23 is fully closed (0% opening) to stop the discharge of isolation liquid. When the isolation liquid level in the receiving pipe 12 is between the upper, middle, and lower discrete thresholds, the opening of the solenoid valve 23 is linearly adjusted proportionally (0-100% thread control) to keep the isolation liquid interface close to the middle level.

[0042] In the above embodiments, preferably, the outer side of the uniform feeding belt 3 is provided with a protruding partition, which is fixed and driven to rotate by rollers at both ends. The feeding speed is controlled by adjusting the rotation speed of the uniform feeding belt 3 by adjusting the rotation speed of the rollers. The rotation speed is set as needed, preferably 30-120 rpm.

[0043] In the above embodiments, preferably, the mesh size of the filter screen 2 is selected according to actual needs to ensure that the dry powder particles can be fed smoothly and that larger solid impurities or clumps can be screened out. Preferably, the mesh size is not higher than 10 mesh.

[0044] In the above embodiments, preferably, a liquid inlet 8 is provided on the low-pressure liquid distribution pipe 7 for adding liquid materials to the liquid distribution water, thereby forming a dual-discharge mode: when the discharged material is polymer dry powder, the polymer dry powder is filtered through the filter screen 2 of the discharge hopper 1 and falls directly into the isolation liquid in the silo 4; when the discharged material is liquid, the liquid material enters directly through the liquid inlet 8 and mixes with the low-pressure water in the low-pressure liquid distribution pipe 7, and then enters the dispersion module.

[0045] In the above embodiments, preferably, the stirring blade is nearly rectangular, with its lower part closely attached to the bottom of the separation chamber 9 and its side closely attached to the lower half of the separation chamber 9, thereby scraping away the polymer dry powder deposited at the bottom of the separation chamber 9.

[0046] In the above embodiments, preferably, the isolation liquid is a liquid that is insoluble in water, has a lower density than water, is not easily volatile, is not flammable, is non-toxic, non-corrosive, and does not react with the polymer dry powder. Preferably, it is an oil, such as white oil.

[0047] Example 2 Based on the closed-loop anti-agglomeration online dispersing device for polymer dry powder on offshore platforms provided in Example 1, this example also provides a closed-loop anti-agglomeration online dispersing method for polymer dry powder on offshore platforms, including the following steps: S100. Add the polymer dry powder from the hopper 1, filter it through the filter screen 2 and then sprinkle it onto the uniform speed feeding belt 3. Driven by the uniform speed feeding belt 3, it further leaks into the hopper 4 and accumulates at the bottom of the hopper 4. S200. As the polymer dry powder leaks down to the bottom of the hopper 4, it is gradually dispersed in the isolation liquid in the hopper 4, forming a dry powder-isolation liquid mixture with the isolation liquid; S300. The dry powder-isolation liquid mixture is quantitatively added to the low-pressure solution water pipe 7 by the transfer pump 5, and mixed with the low-pressure solution water to form a three-phase mixture of isolation liquid-water-polymer. S400. Under the pressure of the low-pressure liquid distribution pipe 7 and the delivery pump 5, the three-phase mixture is sent into the separation chamber 9. Through the stirring, centrifugal rotation and directional pushing action of the stirrer 10, the separation liquid and polymer dry powder are separated. S500. Due to the density difference, the separated liquid moves upward along the receiving pipe 12 under the action of gravity, and pushes the interface between the separated liquid and the low-pressure dispensing water downward, causing the separated polymer dry powder and the low-pressure dispensing water to enter the mixing pipeline 11. When the interface between the separated liquid and the low-pressure dispensing water drops to the lower liquid level, the solenoid valve 23 is fully open. Under the pressure of the low-pressure dispensing water and the delivery pump 5, the separated liquid rises through the return drain pipe into the silo 4, realizing the recycling of the separated liquid; when the interface between the separated liquid and the low-pressure dispensing water moves upward to the upper interface, the solenoid valve 23 is fully closed, and the separated liquid stops entering the silo 4.

[0048] This invention achieves a fully closed-loop operation from polymer dry powder feeding, dispersion, and mixing to separator liquid separation and recovery. It effectively avoids contact between the polymer dry powder and humid air and oxygen, eliminating agglomeration and the formation of "fish eyes," significantly improving the quality of the polymer solution. Simultaneously, it eliminates the need for a nitrogen-sealed nitrogen generator and related facilities. The device has a compact structure and small footprint, while the recycling of the separator liquid reduces operating costs, making it particularly suitable for the confined spaces and harsh environmental requirements of offshore platforms.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A closed-loop, anti-agglomeration online dispensing and dispersing device for polymer dry powder on offshore platforms, characterized in that, include: The isolation liquid tank module includes a hopper, a silo, and an isolation liquid supply system. The hopper is located above the silo, which contains isolation liquid. Polymer dry powder falls into the silo through the hopper and is coated by the isolation liquid to form a dry powder-isolation liquid mixture. The feeding module includes a conveying pump and a low-pressure dispensing water pipe. The inlet of the conveying pump is connected to the bottom outlet of the silo, and the outlet of the conveying pump is connected to the low-pressure dispensing water pipe, for quantitatively conveying the dry powder-isolation liquid mixture into the low-pressure dispensing water pipe. The dispersion module includes a separation chamber, a stirrer built into the separation chamber, and a drive motor connected to the stirrer. The separation chamber is connected downstream of the low-pressure dispensing water pipe and is used to receive the three-phase mixture formed by mixing the dry powder-isolation liquid mixture with the low-pressure dispensing water, and to separate the isolation liquid from the polymer dry powder through the stirring action of the stirrer. The isolation fluid recovery and circulation module includes a liquid collection pipe and a liquid return pipe. The inlet end of the liquid collection pipe is connected to the top outlet of the separation chamber, and the outlet end of the liquid collection pipe is connected to the silo through the liquid return pipe, for recycling the separated isolation fluid back to the silo.

2. The closed-loop anti-agglomeration online dispensing and dispersing device for polymer dry powder on offshore platforms according to claim 1, characterized in that, The isolation liquid pool module also includes two uniform speed feeding belts installed at an angle above the interior of the silo. A gap is maintained between the two uniform speed feeding belts. The uniform speed feeding belts are of a tracked structure. The outer side of the uniform speed feeding belts is provided with protruding partitions. The polymer dry powder is driven to leak uniformly into the isolation liquid in the silo by the rotation of the track.

3. The closed-loop anti-agglomeration online dispensing and dispersing device for polymer dry powder on offshore platforms according to claim 2, characterized in that, The feeding hopper is an inverted frustum shape, and a filter screen is embedded in the lower part of the feeding hopper. The mesh size of the filter screen is no higher than 10 mesh, which is used to filter solid impurities or lumps in the polymer dry powder.

4. The closed-loop anti-agglomeration online dispensing and dispersing device for polymer dry powder on offshore platforms according to claim 3, characterized in that, The isolation fluid supply system includes an isolation fluid inlet / outlet pipe, an isolation fluid inlet / outlet pump valve, and an isolation fluid storage tank. One end of the isolation fluid inlet / outlet pipe is connected to the silo, and the other end is connected to the isolation fluid storage tank. The isolation fluid inlet / outlet pipe is equipped with an isolation fluid inlet / outlet pump valve that has a bidirectional pumping function.

5. The closed-loop anti-agglomeration online dispensing and dispersing device for polymer dry powder on offshore platforms according to claim 4, characterized in that, The silo is provided with transparent monitoring windows on both sides. An upper isolation liquid level monitor and a lower isolation liquid level monitor are respectively installed at the upper and lower transparent monitoring windows on one side of the silo. The upper isolation liquid level monitor and the lower isolation liquid level monitor are electrically connected to the isolation liquid inlet and outlet pump valve. When the isolation fluid interface drops to the lower level, the isolation fluid inlet / outlet pump valve is opened to replenish the isolation fluid from the isolation fluid storage tank into the silo; when the isolation fluid interface rises to the upper level, the isolation fluid inlet / outlet pump valve is opened to output in the reverse direction, discharging the isolation fluid from the silo into the isolation fluid storage tank.

6. The closed-loop anti-agglomeration online dispensing and dispersing device for polymer dry powder on offshore platforms according to claim 5, characterized in that, An upper dry powder accumulation interface monitor and a lower dry powder accumulation interface monitor are installed at the upper and lower transparent monitoring windows on the other side of the silo, respectively, to monitor the upper and lower interfaces of the polymer dry powder accumulation body in the silo; When the polymer dry powder accumulation rises to the upper interface, an alarm is triggered and feeding from the hopper is stopped; when the polymer dry powder accumulation falls to the lower interface, an alarm is triggered and feeding from the hopper is accelerated.

7. The closed-loop anti-agglomeration online dispensing and dispersing device for polymer dry powder on offshore platforms according to claim 6, characterized in that, The separation chamber has a cylindrical lower half and a domed upper half. The downstream of the low-pressure dispensing water pipe is connected to one side of the lower half of the separation chamber, and the other side of the lower half of the separation chamber is connected to a mixing pipeline. The agitator consists of a pair of X-shaped stirring blades. The stirring blades are nearly rectangular, with their lower parts close to the bottom of the separation chamber and their sides close to the lower half of the separation chamber.

8. The closed-loop anti-agglomeration online dispensing and dispersing device for polymer dry powder on offshore platforms according to claim 7, characterized in that, The liquid receiving pipe is provided with three transparent monitoring windows on one side: upper, middle, and lower. The upper recovery isolation liquid level monitor, the middle recovery isolation liquid level monitor, and the lower recovery isolation liquid level monitor are respectively installed. The upper, middle, and lower recovery isolation liquid level monitors are electrically connected to the solenoid valves provided on the return drain pipe. When the level of the isolation fluid in the receiving tube drops to the lower level, the solenoid valve is fully open; when the isolation fluid interface reaches the middle level, the solenoid valve is half open; when the isolation fluid interface rises to the upper level, the solenoid valve is fully closed; when the isolation fluid level is between the upper, middle, and lower discrete thresholds, the opening of the solenoid valve is linearly adjusted proportionally to make the isolation fluid interface approach the middle level.

9. The closed-loop anti-agglomeration online dispensing and dispersing device for polymer dry powder on offshore platforms according to claim 8, characterized in that, The low-pressure liquid distribution pipe is equipped with a liquid inlet for realizing a dual feeding mode of dry powder and liquid materials on the feeding and dispersing device; the isolation liquid is a liquid that is insoluble in water and has a density less than water, and is selected from white oil.

10. A closed-loop, anti-agglomeration method for dispersing polymer dry powder on an offshore platform, using the apparatus described in any one of claims 3 to 9, characterized in that... Includes the following steps: The polymer dry powder is added from the hopper, sprinkled onto the uniform feeding belt through the filter screen, and then leaked into the hopper under the action of the uniform feeding belt, where it accumulates at the bottom of the hopper. As the polymer dry powder leaks down to the bottom of the silo, it gradually disperses in the isolation liquid in the silo, forming a dry powder-isolation liquid mixture. The dry powder-isolation fluid mixture is quantitatively added to the low-pressure solution water pipe by a delivery pump and mixed with the low-pressure solution water to form an isolating fluid-water-polymer three-phase mixture. The three-phase mixture is fed into the separation chamber, where the separation liquid and polymer dry powder are separated by the stirring, centrifugal rotation, and directional pushing action of the agitator. Due to the density difference, the separated liquid moves upward along the liquid collection pipe under the action of gravity and enters the silo through the return liquid pipe, realizing the recycling of the separated liquid. At the same time, the separated polymer dry powder and low-pressure liquid preparation water enter the mixing liquid pipeline.

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