Hydrocyclone cleaning system and method

Abstract

The invention relates to a hydrocyclone cleaning system and method. The cleaning system comprises a hydrocyclone and a cleaning device. The hydrocyclone is provided with a fluid inlet positioned at the top, a closed discharge port positioned at the bottom, and an oil phase outlet and a water phase outlet which are respectively positioned at two ends; the cleaning device comprises a liquid storage barrel for storing a cleaning agent, a circulating pump for providing power for conveying the cleaning agent, and water conveying equipment for providing clean water; a plurality of oil conveying pipelines and a plurality of oil return pipelines are arranged between the liquid storage barrel and the hydrocyclone to form a plurality of circulation loops, so that the hydrocyclone is soaked by a cleaning agent and sequentially and circularly flushed in multiple directions; and the water delivery equipment is configured to be connected with the hydrocyclone after the cleaning of the cleaning agent is finished so as to carry out secondary flushing on the hydrocyclone. The hydrocyclone cleaning system can realize online cleaning; in addition, the cleaning system is easy and convenient to operate, high in cleaning efficiency and capable of saving manpower and time.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrocyclone maintenance, and in particular to a hydrocyclone cleaning system and method. Background Art

[0002] A hydrocyclone is a physical separation device that uses the rotational flow of liquid and centrifugal force to achieve solid-liquid or liquid-liquid separation. It can efficiently remove suspended solid particles and dirty oil in production water, thereby improving the quality and purity of the discharged water.

[0003] However, as the hydrocyclone ages, problems such as sand accumulation, scaling, and clogging can develop inside it. This not only reduces separation efficiency but also impacts the normal operation of the entire process. To ensure efficient operation, the hydrocyclone must be regularly opened and cleaned. This involves removing the hydrocyclone's cyclone tube, soaking it in diesel fuel, and then physically cleaning the inside of the tube directly using tools such as high-pressure water jets or steel wool. However, this traditional cleaning method is not only time-consuming and wastes significant manpower and resources, but also suffers from limitations such as low cleaning efficiency and damage to the equipment. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a hydrocyclone cleaning system and method.

[0005] The technical solution adopted by the present invention to solve the technical problem is: constructing a hydrocyclone cleaning system, including a hydrocyclone and a cleaning device for cleaning the hydrocyclone;

[0006] The hydrocyclone is provided with a fluid inlet at the top, a closed discharge outlet at the bottom, and an oil phase outlet and a water phase outlet at both ends respectively;

[0007] The cleaning device includes a liquid storage barrel for storing detergent, a circulation pump for providing power for delivering the detergent, and a water delivery device for providing clean water;

[0008] A plurality of oil delivery pipelines and a plurality of oil return pipelines are provided between the liquid storage tank and the hydrocyclone to form multiple circulation loops, thereby enabling the detergent to sequentially circulate and flush the hydrocyclone in multiple directions. The multiple circulation loops include a first circulation loop in which liquid flows from the liquid storage tank into the fluid inlet and then flows back to the liquid storage tank from the oil phase outlet; a second circulation loop in which liquid flows from the liquid storage tank into the oil phase outlet and then flows back to the liquid storage tank from the fluid inlet; and a third circulation loop in which liquid flows from the liquid storage tank into the water phase outlet and then flows back to the liquid storage tank from the oil phase outlet.

[0009] The water delivery device is configured to be connected to the hydrocyclone after the cleaning agent is cleaned, so as to perform a secondary flushing on the hydrocyclone.

[0010] In some embodiments, a plurality of pipelines are provided between the water delivery device and the hydrocyclone to form a plurality of water flow passages, thereby enabling sequential multi-directional cleaning of the hydrocyclone by clean water; the plurality of water flow passages include a first water flow passage flowing in from the fluid inlet and out from the closed discharge outlet, a second water flow passage flowing in from the oil phase outlet and out from the closed discharge outlet, and a third water flow passage flowing in from the water phase outlet and out from the oil phase outlet.

[0011] In some embodiments, the cleaning device further includes an inflation device and a gas pipeline, wherein the inflation device is configured to inject gas into the hydrocyclone through the gas pipeline to achieve gas purging; one end of the gas pipeline is used to connect to the inflation device, and the other end thereof is connected to the top of the hydrocyclone and is correspondingly located between the two orifice plates of the hydrocyclone.

[0012] In some embodiments, the top of the hydrocyclone is connected to a first pipeline communicating with the fluid inlet, the bottom of the hydrocyclone is connected to a fourth pipeline communicating with the closed discharge outlet, and both ends of the hydrocyclone are respectively connected to a second pipeline communicating with the water phase outlet and a third pipeline communicating with the oil phase outlet;

[0013] The plurality of oil pipelines include a first oil pipeline, a second oil pipeline, and a third oil pipeline; the first oil pipeline is connected to the liquid storage tank and the first pipeline respectively; the second oil pipeline is connected to the liquid storage tank and the second pipeline respectively; the third oil pipeline is connected to the liquid storage tank and the third pipeline respectively;

[0014] The several oil return pipelines include a first oil return pipeline, a second oil return pipeline and a recovery pipeline; the first oil return pipeline is connected to the liquid storage tank and the first pipeline respectively; the second oil return pipeline is connected to the liquid storage tank and the third pipeline respectively; the recovery pipeline is connected to the liquid storage tank and the fourth pipeline respectively.

[0015] In some embodiments, a fifth pipeline is further connected between the first pipeline and the third pipeline to provide a basis for the first pipeline to communicate with the oil phase outlet;

[0016] The first water flow path includes the first pipeline and the fourth pipeline, and the first pipeline is arranged upstream of the fourth pipeline; the second water flow path includes the fourth pipeline, the fifth pipeline and part of the first pipeline, and clean water flows through the first pipeline, the fifth pipeline and the fourth pipeline in sequence; the third water flow path includes the second pipeline and the third pipeline, and the second pipeline is arranged upstream of the third pipeline.

[0017] The present application also provides a hydrocyclone cleaning method, comprising the following steps:

[0018] Install the cleaning device: connect the cleaning device in the above hydrocyclone cleaning system to the hydrocyclone;

[0019] Injecting cleaning agent: Isolate the hydrocyclone, start the circulation pump, and inject the cleaning agent into the hydrocyclone until the entire hydrocyclone is filled;

[0020] Detergent soaking: Turn off the circulation pump and allow the detergent to soak in the hydrocyclone for a preset time;

[0021] Multi-directional circulation cleaning of detergent: Start the circulation pump and conduct the first circulation loop, the second circulation loop and the third circulation loop in a preset order, so that the detergent circulates and cleans the inside of the hydrocyclone in each circulation loop;

[0022] Detergent recovery: turn off the circulation pump to allow the detergent in the hydrocyclone to flow back to the liquid storage tank;

[0023] Multi-directional cleaning with clean water: The water delivery device is connected to the first water flow passage, the second water flow passage and the third water flow passage in a preset order in rotation, so that the clean water can clean the inside of the hydrocyclone;

[0024] Purging operation: Isolate the hydrocyclone and inject gas into it through the inflation equipment until the internal pressure reaches the preset value, and then release the gas to achieve purging.

[0025] In some embodiments, the steps of the multi-directional cleaning process include:

[0026] Forward circulation cleaning of detergent: connect the first oil delivery pipeline and the second oil return pipeline; start the circulation pump to perform circulation flushing of the first circulation loop;

[0027] Reverse circulation cleaning of detergent: disconnect the first oil delivery pipeline and the second oil return pipeline, and connect the third oil delivery pipeline and the first oil return pipeline to perform circulation flushing of the second circulation loop;

[0028] Reverse circulation cleaning of detergent: disconnect the third oil delivery pipeline and the first oil return pipeline, and connect the second oil delivery pipeline and the second oil return pipeline to perform circulation flushing of the third circulation loop.

[0029] In some embodiments, during the multi-directional cleaning process of the detergent, the recovery line is kept open.

[0030] In some embodiments, the steps of the multi-directional cleaning with clean water specifically include:

[0031] Clean water reverse flushing: disconnect the first pipeline and the fourth pipeline, and connect the second pipeline and the third pipeline, so that the clean water of the water supply equipment is flushed into the hydrocyclone (1) from the second pipeline (22) and discharged from the third pipeline (23); after the clean water reverse flushing is completed, disconnect the second pipeline and the third pipeline;

[0032] Clean water forward flushing: connect the first pipeline and the fourth pipeline, and connect the water delivery equipment to the first pipeline, so that the clean water of the water delivery equipment is flushed into the hydrocyclone from the first pipeline and discharged from the fourth pipeline;

[0033] Reverse rinsing with clean water: Keep the first pipeline and the fourth pipeline connected, and open the fifth pipeline so that the clean water from the water delivery equipment is injected into the hydrocyclone from the fifth pipeline and discharged from the fourth pipeline.

[0034] In some embodiments, the hydrocyclone cleaning method further includes a sand flushing operation before the step of injecting the cleaning agent; the sand flushing operation comprises the following steps:

[0035] The first pipeline (21) and the third pipeline (23) are disconnected, and the second pipeline (22) and the fourth pipeline (24) are connected, so that clean water from the water delivery device is flushed into the hydrocyclone (1) from the second pipeline (22) and discharged from the fourth pipeline (24).

[0036] The present invention has the following beneficial effects: The hydrocyclone cleaning system can clean the interior of the hydrocyclone by first soaking it, then flushing it sequentially through multiple loops with a detergent, and finally rinsing it with clean water. This system eliminates the need to disassemble the hydrocyclone cover or extract and disassemble the cyclone tube, enabling online cleaning. Furthermore, it is easy to operate, highly efficient, and saves labor time. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0038] Figure 1 It is a structural diagram of a hydrocyclone in the related art;

[0039] Figure 2It is a structural diagram of a cyclone tube in the related art;

[0040] Figure 3 is a schematic structural diagram of a hydrocyclone cleaning system in some embodiments of the present invention;

[0041] Figure 4 is a flowchart of the hydrocyclone cleaning method of the present invention in some embodiments;

[0042] Figure 5 Schematic diagram of diesel flow during forward circulation cleaning of the hydrocyclone in the present invention;

[0043] Figure 6 Schematic diagram of diesel flow during reverse circulation cleaning of the hydrocyclone in the present invention;

[0044] Figure 7 Schematic diagram of diesel flow during reverse circulation cleaning of the hydrocyclone in the present invention;

[0045] Figure 8 This is a table containing the test data before and after diesel cycle cleaning of a single hydrocyclone;

[0046] Figure 9 This is a table comparing the O1W data of the equipment's effluent after manual cleaning and diesel circulation cleaning over several days.

[0047] Reference numerals:

[0048] Hydrocyclone 1; cyclone chamber 11; first chamber 111; second chamber 112; third chamber 113; cyclone tube 12; oil overflow port 121; water outlet 122; vortex chamber 123; tangential inlet 124; first orifice plate 13; second orifice plate 14; fluid inlet 15; water phase outlet 16; oil phase outlet 17; closed discharge outlet 18; first pipeline 21; second pipeline 22; third pipeline 23; fourth pipeline 24; fifth pipeline 25; circulating pump 3; liquid storage tank 4; first oil pipeline 41; second oil pipeline 42; third oil pipeline 43; second oil return pipeline 44; recovery pipeline 45; first oil return pipeline 46; first circulation loop 51; second circulation loop 52; third circulation loop 53; gas pipeline 6. DETAILED DESCRIPTION

[0049] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0050] It should also be noted that, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0051] In the following description, specific details such as particular system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0052] In related technologies, please refer to Figure 1 The hydrocyclone 1 defines a cyclone chamber 11 , in which a plurality of cyclone tubes 12 are provided, and the plurality of cyclone tubes 12 are respectively mounted on two orifice plates in the cyclone chamber 11 .

[0053] For reference Figure 2The vortex tube 12 can be a long conical structure, which is provided with an internal channel running through it along its axial direction. The internal channel includes an oil overflow port 121 formed at a relatively larger end of the vortex tube 12, and a water outlet 122 formed at a relatively smaller end of the vortex tube 12; a vortex chamber 123 is also formed in the internal channel, and the vortex chamber 123 is located between the oil overflow port 121 and the water outlet 122, and is arranged close to one side of the oil overflow port 121.

[0054] Secondly, if Figure 2 As shown, the circumferential sidewall of the cyclone 12 is further provided with a plurality of tangential inlets 124 arranged at intervals along the circumference of the cyclone 12, and these tangential inlets 124 are correspondingly located at the vortex chamber 123. The fluid to be separated can be introduced into the vortex chamber 123 through the tangential inlet 124, and solid-liquid or liquid-liquid separation can be achieved under the action of the vortex chamber 123. The light phase material can be output from the oil overflow port 121, and the heavy phase material can be output from the water outlet 122. In some embodiments, the fluid to be separated is an oil-water mixture. After separation, the light phase material is the oil phase and the heavy phase material is the water phase. The following will take the case where the fluid to be separated is an oil-water mixture as an example to continue to explain the present application.

[0055] Please refer back to the reference Figure 1 , the two orifice plates are arranged at intervals along the axial direction of the hydrocyclone 1 body. Taking the vortex tube 12 as a reference, the two orifice plates can be divided into a first orifice plate 13 adjacent to the oil overflow port 121 of the vortex tube 12 and a second orifice plate 14 away from the oil overflow port 121 of the vortex tube 12. A plurality of through holes are provided on the first orifice plate 13 and the second orifice plate 14, and the through holes of the first orifice plate 13 and the through holes of the second orifice plate 14 are arranged in a one-to-one correspondence. Each vortex tube 12 can be inserted and fixed in the two corresponding through holes of the first orifice plate 13 and the second orifice plate 14. The tangential inlet 124 of the vortex tube 12 is located between the first orifice plate 13 and the second orifice plate 14, the oil overflow port 121 of the vortex tube 12 is located on the side of the first orifice plate 13 facing away from the second orifice plate 14, and the water outlet 122 of the vortex tube 12 is located on the side of the second orifice plate 14 facing away from the first orifice plate 13.

[0056] The cyclone chamber 11 is defined by the first orifice plate 13 and the second orifice plate 14 into three chambers: a first chamber 111 located between the first orifice plate 13 and the second orifice plate 14; a second chamber 112 located on the side of the first orifice plate 13 facing away from the second orifice plate 14; and a third chamber 113 located on the side of the second orifice plate 14 facing away from the first orifice plate 13. The first chamber 111, the second chamber 112, and the third chamber 113 are connected by the cyclone tube 12.

[0057] The hydrocyclone 1 has an open end near the first orifice plate 13, and a cover plate is provided at the open end to seal the open end. By opening the cover plate, each cyclone tube 12 can be withdrawn from the first orifice plate 13 and the second orifice plate 14 or inserted into the through holes of the first orifice plate 13 and the second orifice plate 14.

[0058] The traditional method for cleaning a hydrocyclone generally includes the following steps: 1. Isolating the hydrocyclone 1 and draining the liquid from the cyclone chamber 11; 2. Loosening the bolts on the cover of the hydrocyclone 1 and opening the cover; 3. Pulling out the cyclone tubes 12 one by one from the cyclone chamber 11 and soaking them in a temporary diesel tank for a predetermined period of time; 4. Disassembling the cyclone tubes 12 one by one and manually cleaning each component of the cyclone tubes 12; 5. Reassembling the cleaned cyclone tubes 12 and purging the internal passages of the cyclone tubes 12 with compressed air; 6. Replacing the sealing rings at both ends of the cyclone tubes 12 as appropriate; 7. Cleaning the cyclone chamber 11 wall, orifice plate, cover plate, and other components of the hydrocyclone 1; 8. Reinstalling the cyclone tubes 12 one by one into the cyclone chamber 11; 9. Replace the gasket on the cover plate; 10. Close the cover plate and tighten the bolts; 11. Starting the hydrocyclone 1 process, conducting a pressure test, and resuming service after verification.

[0059] This traditional cleaning method suffers from numerous drawbacks, including high workload, high labor intensity, long cycle times, complex procedures, and low safety and environmental performance. Understandably, each hydrocyclone 1 requires over 100 man-hours of work, with a cycle time of several days, resulting in low efficiency. Each hydrocyclone 1 is equipped with hundreds of cyclone tubes 12, making manual cleaning highly labor-intensive and repetitive, requiring a high workload. The cleaning process requires disassembly and assembly of the hydrocyclone 1's cover, disassembly and restoration of the cyclone tubes 12, cleaning of the various components of the cyclone 12, and replacement of seals and gaskets, resulting in a complex workflow. Uncovering and manual cleaning processes can easily spill contaminated oil onto the floor, requiring extensive wiping with numerous rags, resulting in a significant amount of oily waste and environmentally unfriendly performance. The need to use temporary diesel tanks for soaking and cleaning can result in long cycles and the risk of diesel volatilization, posing a flammable and explosive safety hazard. The uncovering and cleaning processes also present a risk of hand injury. Due to manual cleaning, cleaning quality can vary widely from person to person.

[0060] Based on this, the present application constructs a hydrocyclone cleaning system and method, through which the hydrocyclone can be cleaned online without disassembling the hydrocyclone 1, which has a positive effect on improving the cleaning efficiency.

[0061] The following first introduces the cleaning system of this hydrocyclone. Figure 3The cleaning system of the hydrocyclone may include: a hydrocyclone 1, and a cleaning device for cleaning the hydrocyclone 1; the cleaning structure may include a circulation pump 3, a liquid storage tank 4, a water delivery device (not shown), an inflation device (not shown), multiple pipelines and multiple valves.

[0062] like Figure 3 As shown, generally, the hydrocyclone 1 is provided with multiple interfaces for connecting to external pipelines. Specifically, a fluid inlet 15 is provided at the top of the hydrocyclone 1, which is correspondingly located between the first orifice plate 13 and the second orifice plate 14. The fluid inlet 15 is connected to the first pipeline 21 for conveying fluid. The fluid to be separated can enter from the fluid inlet 15 and enter the interior of the cyclone 12 through the tangential inlet 124 of the cyclone tube 12. At one end of the hydrocyclone 1 close to the second orifice plate 14, a water phase outlet 16 is provided. The water phase outlet 16 is connected to the second pipeline 22 for connecting to the open discharge caisson. The separated water phase material can pass through the water outlet 122 of the cyclone tube 12, the water phase outlet 16, and the second pipeline 22 in sequence to be discharged to the open discharge caisson. An oil phase outlet 17 is located at one end of the hydrocyclone 1, near the first orifice plate 13. This outlet 17 connects to a third pipeline 23, which is used to connect to a waste oil tank. The separated oil phase passes through the oil overflow port 121 of the cyclone tube 12, the oil phase outlet 17, and the third pipeline 23, before being discharged to the waste oil tank. A closed outlet 18 is located at the bottom of the hydrocyclone 1, located between the first and second orifice plates 13, 14. This closed outlet 18 connects to a fourth pipeline 24, which is used to connect to a wastewater tank, allowing the wastewater remaining between the first and second orifice plates 13, 14 to be discharged to the wastewater tank.

[0063] Understandably, the fluid inlet 15 and the oil phase outlet 17 need to be connected via the tangential inlet 124 and the oil overflow port 121 of the cyclone 12. The fluid inlet 15 and the water phase outlet 16 need to be connected via the tangential inlet 124 and the water outlet 122 of the cyclone 12. The fluid inlet 15 and the closed discharge port 18 are connected via the first chamber 111 of the cyclone chamber 11.

[0064] In this cleaning device, the liquid storage tank 4 is used to store diesel. The multiple pipelines may include several oil delivery pipelines and several oil return pipelines, which are arranged between the liquid storage tank 4 and the hydrocyclone 1 to be responsible for the diesel oil entering and exiting the liquid storage tank 4.

[0065] For reference Figure 3The plurality of oil pipelines may include a first oil pipeline 41, a second oil pipeline 42, and a third oil pipeline 43. The first oil pipeline 41 is used to connect the liquid storage tank 4 and the fluid inlet 15 of the hydrocyclone 1. The two ends of the first oil pipeline 41 may be connected to the liquid storage tank 4 and the first pipeline 21, respectively. The second oil pipeline 42 is used to connect the liquid storage tank 4 and the water phase outlet 16 of the hydrocyclone 1. The two ends of the second oil pipeline 42 may be connected to the liquid storage tank 4 and the second pipeline 22, respectively. The third oil pipeline 43 is used to connect the liquid storage tank 4 and the oil phase outlet 17 of the hydrocyclone 1. The two ends of the third oil pipeline 43 may be connected to the liquid storage tank 4 and the third pipeline 23, respectively.

[0066] The plurality of oil return lines may include a second oil return line 44, a first oil return line 46, and a recovery line 45. The second oil return line 44 is used to connect the liquid storage tank 4 with the fluid inlet 15 of the hydrocyclone 1. Its two ends may be connected to the liquid storage tank 4 and the first pipeline 21, respectively. The first oil return line 46 is used to connect the liquid storage tank 4 with the oil phase outlet 17 of the hydrocyclone 1. Its two ends may be connected to the liquid storage tank 4 and the third pipeline 23, respectively. The recovery line 45 is used to connect the liquid storage tank 4 with the closed discharge outlet 18 of the hydrocyclone 1. Its two ends may be connected to the liquid storage tank 4 and the fourth pipeline 24, respectively.

[0067] It should be noted that the first oil delivery pipeline 41 and the second oil return pipeline 44 can be two independent pipelines, wherein the first oil delivery pipeline 41 is connected to the output port of the liquid storage barrel 4 through the circulation pump 3, and the second oil return pipeline 44 is connected to the recovery port of the liquid storage barrel 4. The first oil delivery pipeline 41 and the second oil return pipeline 44 can also be a single pipeline, which is connected to the output port of the liquid storage barrel 4 when oil is required to be delivered, and to the recovery port of the liquid storage barrel 4 when oil is required to be returned. The same applies to the third oil delivery pipeline 43 and the first oil return pipeline 46.

[0068] The circulation pump 3 is used to provide power for diesel delivery and return. The water delivery equipment is used to provide clean water, which can be injected into the hydrocyclone 1 to clean the inside of the hydrocyclone 1. In some embodiments, the water delivery equipment can be an open-drain pipe system. In this way, there is no need to equip new water delivery equipment, which can avoid water resource waste and reduce pipeline connections. It should be noted that the open-drain pipe system is an upstream pipeline located on the open-drain caisson and is used to collect the separated water to the open-drain caisson. The open-drain pipe system is relatively located above the open-drain caisson, and the water pressure is greater, which is more conducive to cleaning.

[0069] The aeration device is used to provide gas, which is injected into the hydrocyclone 1 to purge the inside of the hydrocyclone 1. In some embodiments, the aeration device can be a platform public gas system, so that there is no need to equip a new aeration device. It can be added here that the aeration device is not a necessary component of the cleaning system. As a preferred solution, it can improve the cleaning effect. Correspondingly, continue to refer to Figure 3 The multiple pipelines also include a gas pipeline 6, one end of which is used to connect to the inflation device, and the other end is connected to the top of the hydrocyclone 1, correspondingly located between the first orifice plate 13 and the second orifice plate 14.

[0070] Secondly, you can refer to Figure 3 , the first pipeline 21, the second pipeline 22, the third pipeline 23, the fourth pipeline 24, the first oil pipeline 41, the second oil pipeline 42, the third oil pipeline 43, the recovery pipeline 45, and the gas pipeline 6 are each provided with at least one valve for controlling the on / off of the corresponding pipeline. Since one end of the second return oil pipeline 44 and the third oil pipeline 43 are both connected to the oil phase outlet 17 and do not belong to the same circuit, the second return oil pipeline 44 and the third oil pipeline 43 can share a valve for control; similarly, the first return oil pipeline 46 and the first oil pipeline 41 can share a valve for control. In this embodiment, a normally open valve NO.1 is provided on the first pipeline 21; a normally closed valve NO.3 and a normally closed valve NO.4 are provided on the fourth pipeline 24; the valves on other pipelines can be used as a reference for the above content and will not be described in detail here. It can be supplemented here that, for this cleaning system, in addition to using diesel as a cleaning agent, chemical agents that promote oil-water separation can also be selected to improve the cleaning effect. In the selection of the circulation pump 3, a pneumatic diaphragm pump or a centrifugal pump can be selected; secondly, the circulation pump 3 can be configured as a mobile type or a fixed type, which is not limited here. In the selection of the pipeline connecting the liquid storage tank 4 and the hydrocyclone 1, a rubber hose, a PVC pipe or a metal hard pipe can be selected, which is not limited here.

[0071] The cleaning system injects diesel into the hydrocyclone 1 through the cooperation between the circulation pump 3, the liquid storage tank 4 and multiple pipelines, and adopts a method of first soaking and then circulating cleaning in multiple directions to achieve cleaning of the hydrocyclone 1 without disassembling the hydrocyclone 1.

[0072] In some embodiments, the cleaning system can be configured as follows: first, the hydrocyclone 1 is isolated to form a sealed space within the hydrocyclone 1. Then, diesel is filled into the hydrocyclone 1 through at least one of the first, second, and third oil pipelines 41, 42, and 43, and the diesel is allowed to soak in the hydrocyclone 1 for several hours. Next, the circulation pump 3 is activated to circulate and flush the interior of the hydrocyclone 1 along multiple preset routes. The multiple preset routes include a forward route, a reverse route, and a reverse route. The forward route flows from the fluid inlet 15 to the oil phase outlet 17. The reverse route flows from the oil phase outlet 17 to the fluid inlet 15. The reverse route flows from the water phase outlet 16 to the oil phase outlet 17. After several cycles of flushing the interior of the hydrocyclone 1, most of the dirt inside the hydrocyclone 1 can be carried back to the liquid storage tank 4 along with the diesel. Next, the pipeline between the water delivery device and hydrocyclone 1 is opened, allowing clean water to flow into the hydrocyclone 1. The interior of the hydrocyclone 1 is also cleaned along multiple pre-set routes, removing any remaining dirt and diesel. Finally, the pipeline between the aeration device and hydrocyclone 1 is opened, injecting gas into the hydrocyclone 1 to purge and remove any remaining sediment. Once the purge is complete, the cleaning process is complete, and the cleaning device can be removed.

[0073] The hydrocyclone cleaning method is based on the above-mentioned hydrocyclone cleaning system. Figure 4 The hydrocyclone cleaning method may include the following steps: injecting diesel, immersing diesel, multi-directional circulating cleaning of diesel, recovering diesel, multi-directional flushing and cleaning with clean water, and purging operations.

[0074] In the diesel injection step, the hydrocyclone 1 is isolated and the circulation pump 3 is started to pump diesel into the hydrocyclone 1 from the fluid inlet 15 and the oil phase outlet 17 respectively until the entire cyclone chamber 11 is filled. It should be noted here that the diesel is designed to be pumped into the hydrocyclone 1 from the fluid inlet 15 and the oil phase outlet 17 respectively. This is because the multi-directional circulation cleaning of diesel usually starts from the forward route. Such a design does not require the readjustment of the pipeline and can optimize the cleaning process, thereby improving the cleaning efficiency. In the diesel soaking step, the circulation pump 3 is turned off and the diesel is allowed to soak in the hydrocyclone 1 for several hours. It can be understood that the physical and chemical properties of diesel have a strong dissolving ability and can dissolve the organic components in the scale inside the hydrocyclone 1, thereby causing the scale to fall off. In addition, the volatility of diesel helps to quickly remove residual substances after cleaning, reducing the impact on the subsequent operation of the equipment.

[0075] In the diesel multi-directional circulation cleaning step, it can include diesel forward circulation cleaning, diesel reverse circulation cleaning and diesel reverse circulation cleaning. The diesel forward circulation cleaning corresponds to the above-mentioned forward route, which mainly flushes the area of ​​the tangential inlet 124-vortex chamber 123-oil overflow port 121 of the swirl tube 12. The diesel reverse circulation cleaning corresponds to the above-mentioned reverse route, which mainly reversely flushes the area of ​​the tangential inlet 124-vortex chamber 123-oil overflow port 121 of the swirl tube 12. The diesel reverse circulation cleaning corresponds to the above-mentioned reverse route, which mainly flushes the water outlet 122-vortex chamber 123-oil overflow port 121 of the swirl tube 12, that is, flushes the entire internal channel. It can be supplemented here that in the diesel multi-directional circulation cleaning step, diesel will also flow in the swirl chamber 11, and the inner wall of the swirl chamber 11 can also be cleaned. Completing the three circulation cleanings of forward, reverse and reverse constitutes a cleaning cycle. In actual operation, the number of cleaning cycles can be flexibly adjusted according to the degree of dirtiness of the hydrocyclone 1 to ensure that an ideal cleaning effect is achieved.

[0076] In diesel forward cycle cleaning, please refer to Figure 5 , connect the liquid storage barrel 4-circulation pump 3-first oil pipeline 41-part of the first pipeline 21-fluid inlet 15-cyclone tube 12-oil phase outlet 17-part of the third pipeline 23-second oil return pipeline 44-first circulation loop 51 of the liquid storage barrel 4, and connect the recovery pipeline 45, and start the circulation pump 3 for circulation flushing. After starting, first start the diesel circulation at a lower flow rate; during the circulation process, closely observe the circulation pressure, flow rate and other parameters to ensure stable operation of the system. If the pressure suddenly rises or the flow drops sharply, it may be a pipe blockage or valve failure, which needs to be checked in time. During the operation, make good adjustments to the displacement of the circulation pump 3 to achieve dynamic balance of diesel in and out of the hydrocyclone 1. As the cleaning progresses, the condition of the diesel discharged to the liquid storage barrel 4 can be observed. If it is observed that the scale in the diesel is gradually dissolved, the flow rate can be appropriately increased to enhance the cleaning effect.

[0077] After the diesel has been circulating forward for a period of time, perform the diesel reverse circulation cleaning. Figure 6 Adjust the diesel inlet and outlet of the hydrocyclone 1, namely, connect the liquid storage tank 4, the circulating pump 3, the third oil pipeline 43, a portion of the third pipeline 23, the oil phase outlet 17, the cyclone tube 12, the fluid inlet 15, a portion of the first pipeline 21, the first oil return pipeline 46, the second circulation loop 52 of the liquid storage tank 4, and the recovery pipeline 45, and perform a cyclic flushing. During the reverse circulation cleaning process, the reverse circulation pressure and flow control can be maintained in the same manner as the forward circulation process, mainly backwashing the inlet cutout of the cyclone tube 12 and the oil end overflow port.

[0078] After the above-mentioned forward and reverse diesel circulation cleaning, the tangential inlet 124 and the oil overflow port 121 of the cyclone are basically cleaned. At this time, the diesel circulation cleaning pipeline is adjusted to perform diesel reverse circulation cleaning. Figure 7 , connect the liquid storage tank 4-circulation pump 3-second oil pipeline 42-part of the second pipeline 22-water phase outlet 16-cyclone tube 12-oil phase outlet 17-part of the third pipeline 23-second return oil pipeline 44-liquid storage tank 4 third circulation loop 53, and the recovery pipeline 45 remain connected and perform circulating flushing.

[0079] It can be added here that during the multi-directional circulation cleaning process of diesel, keeping the recovery pipe 45 open can, on the one hand, increase the oil outlet, thereby increasing the upper limit of the diesel circulation flow rate; on the other hand, it can effectively enhance the cleaning force of the first chamber 111 of the cyclone chamber 11.

[0080] After the diesel multi-directional circulation cleaning is completed, the diesel recovery step is performed. In the diesel recovery step, the circulation pump 3 is turned off, and the diesel in the cyclone chamber 11 is discharged and recovered into the liquid storage tank 4. Figure 1 , the recovery route may include the route of closed discharge outlet 18-part of the fourth pipeline 24-recovery pipeline 45-liquid storage barrel 4; the recovery route may also include the route of oil phase outlet 17-part of the third pipeline 23-first oil return pipeline 46-liquid storage barrel 4. Secondly, during the discharge process, care should be taken to prevent the impurities mixed in the diesel from settling in the pipeline. Diesel containing a large amount of scale requires filtration, precipitation and other treatments for recovery. For example, a filter can be set in the liquid storage barrel 4. This cleaning system supports continuous cleaning of multiple hydrocyclones 1; if multiple hydrocyclones 1 need to be cleaned continuously, the diesel in the temporary diesel storage tank can be filtered and reused after cleaning one hydrocyclone 1 to reduce diesel consumption.

[0081] In some embodiments, the multi-directional clean water circulation cleaning process can include a clean water reverse flush, a clean water forward flush, and a clean water reverse rinse. The clean water can be production water or wastewater. It should be noted that completing the forward, reverse, and reverse cycles constitutes a cleaning cycle. In actual operation, the number of cleaning cycles can be flexibly adjusted based on the degree of contamination of the hydrocyclone 1 after diesel flushing to ensure the desired cleaning effect.

[0082] During the clean water reverse flush, the first and fourth pipelines 21 and 24 are disconnected, and the second and third pipelines 22 and 23 are connected to form a third water flow path; the third water flow path includes the second pipeline 22, the hydrocyclone 1, and the third pipeline 23. A water delivery device is connected to the second pipeline 22 to flush clean water from the second pipeline 22 into the cyclone chamber 11. The clean water is discharged from the oil phase outlet 17 of the hydrocyclone 1 and discharged into the waste oil tank through the third pipeline 23. The entire clean water reverse flush process can last for several minutes. After the high-flow reverse flush, the scale adhered to the inside of the cyclone tube 12 is further effectively flushed, and the diesel and residual impurities inside the cyclone chamber 11 and cyclone tube 12 are washed away. After the clean water reverse flush is completed, the second and third pipelines 22 and 23 are disconnected.

[0083] During a clean water forward flush, the first and fourth pipelines 21 and 24 are connected to form a first water flow path; this first water flow path comprises the first pipeline 21, the hydrocyclone, and the fourth pipeline 24. A water delivery device is connected to the first pipeline 21, and clean water is flushed into the cyclone chamber 11 through the first pipeline 21. The clean water is discharged from the closed outlet 18 of the hydrocyclone 1 and discharged into the sewage tank via the fourth pipeline 24. The entire clean water forward flush process can last for several minutes. After this high-flow forward flush, diesel and residual materials within the cyclone chamber 11 are further flushed into the sewage tank.

[0084] During the reverse rinse with clean water, keep the first pipeline 21 and the fourth pipeline 24 connected, and open the fifth pipeline 25 (see Figure 1 ) to form a second water flow path, so that clean water can be injected from the oil phase outlet 17 of the hydrocyclone 1 and discharged from the closed outlet 18 of the hydrocyclone 1. The second water flow path includes a portion of the first pipeline 21-fifth pipeline 25-hydrocyclone 1-fourth pipeline 24. It should be noted here that the fifth pipeline 25 is configured to be connected between the first pipeline 21 and the third pipeline 23; one end of the fifth pipeline 25 is connected between the valve on the first pipeline 21 and the fluid inlet 15, and the other end of the fifth pipeline 25 is connected between the valve on the third pipeline 23 and the oil phase outlet 17. A valve No. 2 is also provided on the fifth pipeline 25. It is understandable that since the reverse flushing and forward flushing have basically cleaned the interior of the hydrocyclone 1, there is no need to perform impact cleaning. At this time, it is sufficient to directly open the reverse flushing valve (i.e., valve No. 2) and rinse for several minutes; in other words, the flow rate corresponding to rinsing is less than the flow rate corresponding to flushing.

[0085] It should be noted that rinsing is not limited to being performed in the second water flow path; in other embodiments, flushing can be performed along the second water flow path first, and then rinsing can be performed along the first water flow path.

[0086] After the multi-directional circulation cleaning with clean water is completed, the purging operation step is performed. In the purging operation step, all pipelines connected to the hydrocyclone 1 are disconnected to form a closed space; the gas supply line 6 is connected to inject the gas of the inflation equipment into the hydrocyclone 1. The gas can be compressed air or compressed nitrogen; when the internal air pressure of the cyclone reaches the preset value, the fourth pipeline 24 is quickly connected to release the gas. After the gas is released, the fourth pipeline 24 can be disconnected again, and the gas can continue to be injected; repeat the above inflation and deflation steps several times. Under the action of gas blasting and purging, the residual substances in the cyclone chamber 11 can be discharged along with the gas.

[0087] After the purging operation is completed, the cleaning is finished and the hydrocyclone 1 can be put into use again.

[0088] It is to be noted that the diesel soaking time, diesel washing times, and clean water washing times in the hydrocyclone cleaning method can be adjusted according to the degree of dirtiness of the hydrocyclone 1 and the decontamination effect according to actual needs, and are not specifically limited here.

[0089] In some embodiments, reference may be made to Figure 4 Before diesel injection, sand flushing can be performed. Understandably, in some field conditions, the fluid to be separated may contain impurities such as mud and sand. Since the overflow port 121 of the cyclone tube 12 is relatively small, sand can easily accumulate within the cyclone chamber 11. Therefore, prioritizing sand removal from the hydrocyclone 1 before diesel circulation and cleaning is essential. Furthermore, a sand detector can be used to monitor the sand content within the hydrocyclone 1, ensuring maximum removal of deposited sand from the cyclone chamber 11.

[0090] During the sand flushing operation, the first pipeline 21 and the third pipeline 23 are disconnected, and the second pipeline 22 and the fourth pipeline 24 are connected, so that the clean water of the water supply equipment is flushed from the second pipeline (22) into the hydrocyclone (1) for cleaning, and is discharged from the fourth pipeline (24) to the sewage tank.

[0091] In summary, this cleaning method achieves online cleaning without removing the cover plate of the hydrocyclone 1 or extracting and disassembling the cyclone tube 12. Since there is no need to remove the cover plate or disassemble the cyclone tube 12, the cleaning operation can be completed by simply connecting the pipeline and the circulation pump 3, opening and closing the valve, and adding diesel. This simple and convenient operation can improve decontamination efficiency and save labor time. This cleaning method can effectively ensure the rapid completion of the cleaning of the entire hydrocyclone 1; compared with traditional cleaning methods, this method can significantly improve cleaning efficiency.

[0092] Secondly, since this cleaning method supports online cleaning, the diesel basically circulates in the hydrocyclone 1, with a short cycle, reducing the risk of flammability and explosion such as diesel volatilization; at the same time, since there is no need to disassemble the cover plate and the cyclone tube 12, the operational risk is reduced and the safety factor is improved.

[0093] Diesel recycling cleaning reduces equipment failures caused by scaling, corrosion, and other issues in the hydrocyclone 1, lowering equipment repair and replacement costs. Regular diesel recycling cleaning extends the life of the hydrocyclone 1 and reduces the proportion of equipment investment in total production costs. Furthermore, diesel recycling cleaning further improves the oil removal efficiency of the hydrocyclone 1, and the outflow water quality meets standard requirements. In light of this, adjustments to the water clarifier injection concentration are being made simultaneously. By gradually reducing the total injection volume, chemical costs are further reduced.

[0094] Furthermore, the diesel used in this cleaning method can be recycled within a single unit or reused between different units. The recovered waste oil in the liquid storage tank 4 can be filtered and then injected into the crude oil treatment system, achieving environmentally friendly recycling of waste diesel oil. Furthermore, the crude oil skimmed from the hydrocyclone 1 into the waste oil tank can also be recycled to the crude oil treatment system via a waste oil pump, effectively reducing crude oil discharge losses.

[0095] In order to verify the cleaning effect of the present cleaning method, the present application also conducted a cleaning effect comparison experiment on the hydrocyclone 1 .

[0096] For reference Figure 8 , under the condition of constant control of operating parameters, the detection data of the hydrocyclone 1 before and after cleaning is obtained. Figure 8 As shown in Table 3, after cleaning by this cleaning method, the oil removal efficiency of the hydrocyclone 1 is significantly improved, and the OIW value of the outflowing water quality is reduced from 24-27 mg / L before cleaning to 15-17 mg / L, meeting the first-level emission standard requirements in the relevant standards. The oil removal efficiency of the hydrocyclone 1 is increased to about 80%, and the improvement effect is obvious.

[0097] Secondly, obtain the trend of OIW value change of hydrocyclone 1 outlet after manual cleaning and cleaning by this cleaning method within a few days. Figure 9 As shown in Table 4. It can be supplemented here that oil removal efficiency = (inlet oil concentration OIW-outlet oil concentration OIW) / inlet oil concentration OIW. Figure 9 It can be seen that when comparing the two cleaning methods, when the OIW value at the inlet of the hydrocyclone 1 does not change much, the outlet OIW values ​​corresponding to the two cleaning methods are not much different, indicating that the cleaning effect of this cleaning method is almost the same as that of manual cleaning.

[0098] In summary, the present invention provides an online three-way circulation cleaning system and method. It does not require disassembling the cover plate of the hydrocyclone 1 or extracting the cyclone tube 12. Through the four steps of diesel soaking, three-way diesel circulation cleaning, three-way clean water cleaning, and gas purging, it not only achieves online cleaning and improves the cleaning efficiency of the hydrocyclone 1, but also has a good cleaning effect and a good safety and environmental protection factor.

[0099] It is understandable that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A hydrocyclone cleaning system, characterized in that: It comprises a hydrocyclone (1) and a cleaning device for cleaning the hydrocyclone (1); The hydrocyclone (1) is provided with a fluid inlet (15) at the top, a closed discharge outlet (18) at the bottom, and an oil phase outlet (17) and a water phase outlet (16) at both ends respectively; The cleaning device comprises a liquid storage barrel (4) for storing a cleaning agent, a circulation pump (3) for providing power for delivering the cleaning agent, and a water delivery device for providing clean water; A plurality of oil delivery pipelines and a plurality of oil return pipelines are provided between the liquid storage barrel (4) and the hydrocyclone (1) to form a plurality of circulation loops, thereby enabling the cleaning agent to soak the hydrocyclone (1) and sequentially circulate and flush in multiple directions; the plurality of circulation loops include a first circulation loop (51) in which liquid flows from the liquid storage barrel (4) into the fluid inlet (15) and then flows back to the liquid storage barrel (4) from the oil phase outlet (17); a second circulation loop (52) in which liquid flows from the liquid storage barrel (4) into the oil phase outlet (17) and then flows back to the liquid storage barrel (4) from the fluid inlet (15); and a third circulation loop (53) in which liquid flows from the liquid storage barrel (4) into the water phase outlet (16) and then flows back to the liquid storage barrel (4) from the oil phase outlet (17). The water delivery device is configured to be connected to the hydrocyclone (1) after the cleaning agent cleaning is completed, so as to perform a secondary flushing on the hydrocyclone (1).

2. The hydrocyclone cleaning system according to claim 1, characterized in that: A plurality of pipelines are provided between the water delivery device and the hydrocyclone (1) to form a plurality of water flow passages, thereby enabling the clean water to sequentially clean the hydrocyclone (1) in multiple directions; the plurality of water flow passages include a first water flow passage flowing in from the fluid inlet (15) and out from the closed discharge outlet (18), a second water flow passage flowing in from the oil phase outlet (17) and out from the closed discharge outlet (18), and a third water flow passage flowing in from the water phase outlet (16) and out from the oil phase outlet (17).

3. The hydrocyclone cleaning system according to claim 2, characterized in that: The cleaning device further comprises an aeration device and a gas pipeline (6), wherein the aeration device is configured to inject gas into the hydrocyclone (1) through the gas pipeline (6) to achieve gas purging; one end of the gas pipeline (6) is used to connect to the aeration device, and the other end thereof is connected to the top of the hydrocyclone (1) and is correspondingly located between the two orifice plates of the hydrocyclone (1).

4. The hydrocyclone cleaning system according to claim 3, characterized in that: The top of the hydrocyclone (1) is connected to a first pipeline (21) communicating with the fluid inlet (15), the bottom of the hydrocyclone (1) is connected to a fourth pipeline (24) communicating with the closed discharge outlet (18), and both ends of the hydrocyclone (1) are respectively connected to a second pipeline (22) communicating with the water phase outlet (16) and a third pipeline (23) communicating with the oil phase outlet (17); The plurality of oil pipelines include a first oil pipeline (41), a second oil pipeline (42) and a third oil pipeline (43); the first oil pipeline (41) is connected to the liquid storage barrel (4) and the first pipeline (21) respectively; the second oil pipeline (42) is connected to the liquid storage barrel (4) and the second pipeline (22) respectively; the third oil pipeline (43) is connected to the liquid storage barrel (4) and the third pipeline (23) respectively; The plurality of oil return pipelines include a first oil return pipeline (46), a second oil return pipeline (44) and a recovery pipeline (45); the first oil return pipeline (46) is connected to the liquid storage tank (4) and the first pipeline (21) respectively; the second oil return pipeline (44) is connected to the liquid storage tank (4) and the third pipeline (23) respectively; and the recovery pipeline (45) is connected to the liquid storage tank (4) and the fourth pipeline (24) respectively.

5. The hydrocyclone cleaning system according to claim 4, characterized in that: A fifth pipeline (25) is further connected between the first pipeline (21) and the third pipeline (23) to provide a basis for the first pipeline (21) to communicate with the oil phase outlet (17); The first water flow path includes the first pipeline (21) and the fourth pipeline (24), and the first pipeline (21) is arranged upstream of the fourth pipeline (24); the second water flow path includes the fourth pipeline (24), the fifth pipeline (25) and part of the first pipeline (21), and clean water flows through the first pipeline (21), the fifth pipeline (25) and the fourth pipeline (24) in sequence; the third water flow path includes the second pipeline (22) and the third pipeline (23), and the second pipeline (22) is arranged upstream of the third pipeline (23).

6. A hydrocyclone cleaning method, characterized in that: The following steps are involved: Installing the cleaning device: connecting the cleaning device in the hydrocyclone cleaning system according to claim 5 to the hydrocyclone (1); Injecting cleaning agent: isolating the hydrocyclone (1), and starting the circulation pump (3), injecting the cleaning agent into the hydrocyclone (1) until the entire hydrocyclone (1) is filled; Soaking the cleaning agent: turning off the circulation pump (3) and allowing the cleaning agent to soak in the hydrocyclone (1) for a preset time; Multi-directional circulation cleaning of the detergent: starting the circulation pump (3) and switching on the first circulation loop (51), the second circulation loop (52) and the third circulation loop (53) in a preset order, so that the detergent circulates and cleans the inside of the hydrocyclone (1) in each circulation loop; Cleaning agent recovery: shut down the circulation pump (3) and allow the cleaning agent in the hydrocyclone (1) to flow back to the liquid storage tank (4); Clean water multi-directional cleaning: The water delivery device is connected to the first water flow passage, the second water flow passage and the third water flow passage in a preset order in rotation, so that the clean water cleans the inside of the hydrocyclone 1; Purging operation: isolating the hydrocyclone (1) and injecting gas into the hydrocyclone (1) through the inflation device to achieve purging.

7. The hydrocyclone cleaning method according to claim 6, characterized in that: The operation steps of the multi-directional circulation cleaning of the detergent specifically include: Forward circulation cleaning of the cleaning agent: connecting the first oil delivery pipeline (41) and the second oil return pipeline (44); starting the circulation pump (3) to perform circulation flushing of the first circulation loop (51); Reverse circulation cleaning of the detergent: disconnecting the first oil delivery pipeline (41) and the second oil return pipeline (44), and connecting the third oil delivery pipeline (43) and the first oil return pipeline (46) to perform circulation flushing of the second circulation loop (52); Reverse circulation cleaning of the cleaning agent: disconnect the third oil delivery pipeline (43) and the first oil return pipeline (46), and connect the second oil delivery pipeline (42) and the second oil return pipeline (44) to perform circulation flushing of the third circulation loop (53).

8. The hydrocyclone cleaning method according to claim 7, characterized in that: During the multi-directional circulation cleaning process of the detergent, the recovery pipeline (45) is kept open.

9. The hydrocyclone cleaning method according to claim 6, characterized in that: The operation steps of the clean water multi-directional cleaning specifically include: Clean water reverse flushing: disconnect the first pipeline (21) and the fourth pipeline (24), and connect the second pipeline (22) and the third pipeline (23), so that the clean water of the water supply equipment is flushed into the hydrocyclone (1) from the second pipeline (22) and discharged from the third pipeline (23); after the clean water reverse flushing is completed, disconnect the second pipeline (22) and the third pipeline (23); Clean water forward flushing: connect the water delivery device to the first pipeline (21), and connect the first pipeline (21) and the fourth pipeline (24) so ​​that the clean water of the water delivery device is flushed into the hydrocyclone (1) from the first pipeline (21) and discharged from the fourth pipeline (24); Clean water reverse rinsing: keep the first pipeline (21) and the fourth pipeline (24) conductive, and connect the fifth pipeline (25), so that the clean water of the water delivery equipment is injected into the hydrocyclone (1) from the fifth pipeline (25) and discharged from the fourth pipeline (24).

10. The hydrocyclone cleaning method according to any one of claims 6 to 9, characterized in that: The hydrocyclone (1) cleaning method further comprises a sand flushing operation arranged before the step of injecting a cleaning agent; The operation steps of the sand washing operation include: The first pipeline (21) and the third pipeline (23) are disconnected, and the second pipeline (22) and the fourth pipeline (24) are connected, so that clean water from the water delivery device is flushed into the hydrocyclone (1) from the second pipeline (22) and discharged from the fourth pipeline (24).

Images