Oil tank flushing device

Abstract

The present invention relates to the technical field of oil tank flushing, and in particular to an oil tank flushing device, comprising a crude oil flushing system, an oil tank to be cleaned, and a suction and separation system connected in a closed loop; a dirty oil cleaning system is provided in the oil tank to be cleaned, and the dirty oil cleaning system comprises: a jet body, which is connected to the crude oil flushing system through a delivery pipe, a flushing portion is distributed on the outside thereof, and a drilling portion is distributed on the bottom thereof; a pressure-bearing component, which is located in the middle of the jet body and is in communication connection with the crude oil flushing system; a pressure detection unit is provided on the pressure-bearing component, and the pressure detection unit determines the hardness of the sediment layer at the bottom of the oil tank to be cleaned, so that the switching component adjusts the working state of the flushing portion and the drilling portion in real time, and cooperates with the crude oil flushing system to realize graded regulation of the flushing pressure. The present invention automatically adjusts the working state of the flushing portion and the drilling portion according to the condition of the sediment layer at the bottom of the tank through the pressure-bearing component, flushes, drills, and breaks the sediment layer, thereby improving the cleaning effect of the oil tank.

Description

Technical Field

[0001] The present invention relates to the technical field of oil tank flushing, in particular to an oil tank flushing device. Background Art

[0002] After long-term operation of oil storage tanks, sludge containing sulfides, wax, colloid and other components will be deposited at the bottom of the tank, causing corrosion of the tank body, reduction of effective volume, and safety hazards such as hydrogen sulfide poisoning and oil and gas flash explosion. Therefore, the oil tank needs to be cleaned regularly.

[0003] Traditional mechanical tank cleaning technology involves pumping out all the oil from the tank being cleaned. A heated, pressurized cleaning fluid is then sprayed onto the tank bottom and walls to dissolve the remaining viscous crude oil and sludge. The recovered cleaning fluid is then processed through a three-phase separation device. Finally, various parts of the tank are repeatedly cleaned with warm water or steam until the desired effect is achieved. However, in actual use, mechanical tank cleaning technology transfers the sludge from the original tank bottom to other tanks, without purifying or recovering it, resulting in a waste of resources.

[0004] Chinese patent application number 202010133025.4 discloses a system for purifying dirty oil from a mechanical cleaning process of an oil storage tank, comprising a cleaning system and a purification system. The cleaning system comprises an oil storage tank and a mechanical cleaning device, and the purification system comprises a cache unit, a heat exchange unit, a two-phase horizontal centrifugal unit, a sedimentation separation unit, and a three-phase disc centrifugal unit. A cleaning system and a purification system are provided, and the cleaning system and the purification system are connected via a valve. Liquid is supplied to the purification system while circulating the cleaning process, and dirty oil purification in the cleaning process of the same oil is achieved without stopping the cleaning process. At the same time, the cleaning system and the purification system can be used separately or as a set. The problem of flow mismatch between the cleaning system and the purification system can be solved by providing a cache unit, and the two systems can be operated simultaneously, thereby improving the disposal efficiency. The cleaning system and purification system provided by the present invention are physical separation processes, which do not require the addition of chemical agents, will not cause secondary pollution to the oil products, and have simple procedures.

[0005] While the aforementioned patented solution achieves efficient oil purification within the same oil cleaning process by integrating a cleaning system with a purification system, in actual engineering applications, the oil accumulated at the bottom of the tank exhibits significant sedimentation characteristics, manifesting as a highly viscous, complex mixture composed of various substances such as colloids, waxes, rust particles, and silt impurities. As this sediment continues to solidify at the bottom of the tank, it can form a high-hardness block structure or a dense accumulation layer, significantly increasing the difficulty of cleaning.

[0006] While the current mainstream mechanical cleaning equipment on the market is capable of fully cleaning the interior of a tank, it has technical limitations when dealing with deposits on the tank bottom. These devices typically lack effective mechanisms for physically breaking up or chemically dissolving the deposits. As a result, after the cleaning operation, the deposits remain attached to the tank bottom in a residual form, making it impossible to completely remove them. This, in turn, affects the long-term operational efficiency and safety of the tank.

[0007] Therefore, in view of the limitations of current oil tank flushing, developing an oil tank flushing device is particularly urgent and important for promoting the development of related technical fields. Summary of the Invention

[0008] The purpose of the present invention is to provide an oil tank flushing device to solve the technical problems raised in the above background technology.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] An oil tank flushing device comprises a crude oil flushing system, an oil tank to be cleaned and a suction and separation system connected in a closed loop;

[0011] The oil tank to be cleaned is provided with a dirty oil cleaning system, and the dirty oil cleaning system comprises:

[0012] The jet body is connected to the crude oil flushing system through a delivery pipe, has a flushing portion on its outer side and a drilling portion on its bottom;

[0013] a pressure-bearing assembly located in the middle of the jet body and in communication with the crude oil flushing system;

[0014] The pressure-bearing component is provided with a pressure detection unit, which determines the hardness of the sediment layer at the bottom of the oil tank to be cleaned, so that the switching component can adjust the working status of the flushing part and the drilling part in real time, and cooperate with the crude oil flushing system to realize graded regulation of the flushing pressure.

[0015] Preferably, the pressure-bearing component comprises:

[0016] a pressure receiving portion located at the bottom of the jet body;

[0017] a pushing portion, which is located inside the jet body and is provided with a pressure detection unit;

[0018] When the jet body has not reached the bottom of the oil tank to be cleaned, the thickness and hardness of the sediment layer in the oil tank to be cleaned are obtained through the numerical changes of the pressure detection unit and the feed rate of the delivery pipe. The crude oil pressure supplied to the jet body by the crude oil flushing system is adjusted in real time based on the obtained information.

[0019] Preferably, the switching element includes:

[0020] a first switching portion, which is located inside the jet body and, when the first switching portion is in a first position, the flushing portion is in a partially open state; and when the first switching portion is in a second position, the flushing portion is in a fully closed state;

[0021] a second switching portion, which is located at the bottom of the jet body, and when the second switching portion is in a first position, the drilling portion is in a partially open state; when the second switching portion is in a second position, the drilling portion is in a fully open state;

[0022] When the first switching part and the second switching part are in the first position, the crude oil pressure supplied to the jet body by the crude oil flushing system is in a first-level high-pressure state; when the first switching part and the second switching part are in the second position, the crude oil pressure supplied to the jet body by the crude oil flushing system is in a second-level high-pressure state.

[0023] Preferably, the first switching unit includes:

[0024] The first section and the second section, when the first switching part is in the first position, the first section partially blocks the flushing part on the jet body; when the first switching part is in the second position, the second section completely blocks the flushing part on the jet body.

[0025] Preferably, the second switching unit includes:

[0026] A sealing member is located at the bottom of the jet body and is used to seal the drilling portion;

[0027] The elastic part is distributed between the jet body and the sealing member. When the elastic part is in a contracted state, the sealing member releases the sealing of the drilling part.

[0028] Preferably, the pressure-bearing portion includes:

[0029] a sliding block, which is located at the bottom of the jet body and is slidably connected to the jet body;

[0030] The wedge-shaped portion is located outside the sliding block and contacts the blocking member.

[0031] Preferably, the pushing portion includes:

[0032] The bracket has a telescopic member connected to the first switching portion provided on its circumference;

[0033] The hydraulic part is arranged on the top of the sliding block, and the top of the hydraulic part is connected to the telescopic part through a connecting pipe, and the telescopic part is connected to the first switching part.

[0034] Preferably, the crude oil flushing system includes an oil supply tank, a cleaning pump is provided at the bottom of the oil supply tank, the other end of the cleaning pump is connected to a heat exchanger, and the heat exchanger is used to heat the flushing oil and pass the heated flushing oil into the jet body.

[0035] Preferably, the suction separation system includes a vacuum pump arranged at the bottom of the oil tank to be cleaned. The vacuum pump passes the dirty oil into the filter, and the filter filters the dirty oil. The filtered dirty oil passes into the suction tank, and then the sludge is passed into the oil-water separation tank through the recovery pump for oil-water separation. The separated clean oil is sent to the recovery tank by the floating oil recovery pump.

[0036] Preferably, a first stop valve is provided between the cleaning pump and the oil supply tank. When the first stop valve is in an open state, the cleaning pump sucks the flushing oil inside the oil supply tank.

[0037] A second stop valve is provided between the oil-water separation tank and the cleaning pump. When the second stop valve is in an open state, the cleaning pump sucks the clean water separated from the oil-water separation tank.

[0038] Technical effects and advantages of the present invention:

[0039] 1. The device calculates the thickness and hardness of the sediment layer through the detection value of the pressure detection unit and the feed rate of the conveying pipe. Based on the calculated information, it adjusts the crude oil pressure supplied by the crude oil flushing system and switches the opening and closing states of the flushing and drilling parts in real time. When encountering a high-hardness sediment layer, the drilling part is activated to flush and drill the sediment layer, while the flushing part simultaneously flushes and melts the surrounding area of the hole to expand the hole diameter. This targeted cleaning method greatly improves the cleaning effect of the sediment layer at the bottom of the oil tank, effectively avoids the problem of sediment residue, and ensures the subsequent normal operation of the oil tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic diagram of the main process of oil tank flushing of the present invention;

[0041] Figure 2 This is a structural diagram of the oil tank flushing of the present invention;

[0042] Figure 3 It is a structural schematic diagram of the nozzle body of the present invention;

[0043] Figure 4 Schematic diagram of the internal structure of the nozzle body of the present invention;

[0044] Figure 5 Schematic diagram of the structure of the shielding portion of the present invention;

[0045] Figure 6 This is a schematic structural diagram of the telescopic shielding member of the present invention;

[0046] Figure 7 It is a structural schematic diagram of the connecting pipe of the present invention.

[0047] The accompanying drawings are:

[0048] 1. Jet body;

[0049] 2. Flushing department;

[0050] 3. Drilling part;

[0051] 4. Pressure-bearing assembly; 401. Bracket; 402. Hydraulic unit; 403. Connecting pipe; 404. Telescopic member; 405. Sliding block; 406. Wedge-shaped unit;

[0052] 5. First switching unit; 501. First interval; 502. Second interval;

[0053] 6. Second switching portion; 601. Sealing member; 602. Elastic portion;

[0054] 7. Delivery pipe;

[0055] 100. Explosion-proof system; 1001. Inert gas generator; 1002. Oxygen content detection system;

[0056] 200, suction and separation system; 2001, vacuum pump; 2002, filter; 2003, suction tank; 2004, recovery pump; 2005, oil-water separation tank; 2006, floating oil recovery pump;

[0057] 300. Crude oil flushing system; 3001. Cleaning pump; 3002. Heat exchanger. DETAILED DESCRIPTION

[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0059] Reference Figures 1 to 7 As shown, the present invention provides an oil tank flushing device, comprising a jet body 1, a delivery pipe 7 is provided on the top of the jet body 1, and an end of the delivery pipe 7 is connected to a screw-in drive unit.

[0060] Reference Figures 1 to 2 As shown, the jet body 1 is located inside the oil tank to be cleaned, and an explosion-proof system 100 is provided on the top of the oil tank to be cleaned, which realizes explosion-proof by injecting inert gas into the interior of the oil tank to be cleaned.

[0061] The explosion-proof system 100 includes an inert gas generator 1001 and an oxygen content detection system 1002. The inert gas generator 1001 introduces inert gas (such as nitrogen) into the oil tank to be cleaned through a pipeline to ensure that the oxygen concentration introduced into the oil tank to be cleaned is diluted to below 8%, thereby physically eliminating the "combustible material" among the three elements of combustion; the oxygen content detection system 1002 performs real-time detection of the oxygen concentration inside the oil tank to be cleaned to dynamically adjust the amount of gas introduced into the oil tank to be cleaned by the inert gas generator 1001.

[0062] Reference Figure 1 As shown, a crude oil flushing system 300 is provided on the outside of the oil tank to be cleaned. The crude oil flushing system 300 is connected to the jet body 1 , and the tank body is flushed by injecting flushing oil into the jet body 1 .

[0063] The crude oil flushing system 300 includes an oil supply tank, which contains the same flushing oil as the interior of the oil tank to be cleaned. A cleaning pump 3001 is provided at the bottom of the oil supply tank. The other end of the cleaning pump 3001 is connected to the heat exchanger 3002. The heat exchanger 3002 is used to heat the flushing oil and pass the heated flushing oil into the jet body 1, which flushes the interior of the oil tank to be cleaned.

[0064] It should be noted that a first on-off valve is provided between the cleaning pump 3001 and the oil supply tank. When the first on-off valve is in an open state, the cleaning pump 3001 sucks the flushing oil inside the oil supply tank.

[0065] Reference Figure 1 As shown, a suction separation system 200 is provided at the bottom of the oil tank to be cleaned, so as to realize the suction and purification of the oil pollution inside the oil tank to be cleaned.

[0066] The suction separation system 200 includes a vacuum pump 2001 connected to the bottom of the oil tank to be cleaned. The vacuum pump 2001 is used to suck the oil sludge inside the bottom of the oil tank to be cleaned. The outlet of the vacuum pump 2001 is connected to a filter 2002. The filter 2002 is used to filter the oil sludge. The dirty oil filtered by the filter 2002 is sent to the suction tank 2003. The sludge is then passed into the oil-water separation tank 2005 through the recovery pump 2004 for oil-water separation. The separated clean oil is sent to the recovery tank through the floating oil recovery pump 2006.

[0067] It should be noted that a second stop valve is provided between the oil-water separation tank 2005 and the cleaning pump 3001 . When the second stop valve is in the open state, the cleaning pump 3001 sucks the clean water separated from the oil-water separation tank 2005 .

[0068] During operation, the mechanical cleaning equipment is connected to the oil tank to be cleaned, the oil supply tank, and the oil recovery tank via temporarily laid pipelines. The fluid oil at the bottom of the oil tank to be cleaned is transferred to the oil recovery tank via vacuum pump 2001. Then, nitrogen or other inert gas is injected into the tank via inert gas generator 1001 to maintain the oxygen content within the tank at a safe level below 8%. The same oil in the oil supply tank is pressurized by cleaning pump 3001 and heated to approximately 70°C using heat exchanger 3002. The hot oil is then ejected at a certain speed and pressure through jet body 1, breaking up and dissolving any remaining solidified residual oil and sludge in the tank. The fluid sludge dissolved in the tank is filtered 2002 to remove solid residue and then transported to the oil-water separation tank 2005. The separated clean oil is transported to the recovery oil tank through the floating oil recovery pump 2006. After the same oil is cleaned (that is, there is no residual sludge in the tank), the clean water is heated as a cleaning medium and the tank wall is cleaned again to meet the conditions for tank maintenance and hot work or to meet subsequent oil change requirements. Example 2

[0069] Although the above embodiment achieves efficient purification of contaminated oil in the cleaning of the same oil product by combining the suction separation system 200 with the crude oil flushing system 300, in actual engineering, the oil deposits accumulated at the bottom of the oil tank for a long time have significant characteristics and are a complex mixture with high viscosity, containing colloids, waxes, rust particles, mud and sand impurities, etc. After solidification, these sediments tend to form high-hardness block structures or dense accumulation layers, increasing the difficulty of cleaning. Although the mainstream mechanical cleaning equipment on the current market can fully clean the interior of the tank, it has technical limitations in dealing with the sediment layer at the bottom of the tank. It lacks an effective mechanism for physically breaking or chemically dissolving the sediment layer, resulting in residual sediment, which affects the long-term operation efficiency and safety of the oil tank.

[0070] Reference Figures 1 to 7 As shown, the present invention provides an oil tank flushing device, comprising a crude oil flushing system 300, an oil tank to be cleaned, and a suction and separation system 200 connected in a closed loop.

[0071] The oil tank to be cleaned is equipped with a dirty oil cleaning system, which includes:

[0072] The jet body 1 is provided with a delivery pipe 7 , which is connected to the crude oil flushing system 300 , and the end of the delivery pipe 7 is connected to a screw-in drive unit.

[0073] The flushing part 2 and the drilling part 3 are distributed on the outside of the jet body 1 , and the drilling part 3 is distributed on the bottom of the jet body 1 .

[0074] The pressure-bearing component 4 is located in the middle of the jet body 1 and is in communication with the crude oil flushing system 300 .

[0075] The switching member is located on the outside of the pressure-bearing component 4. When the pressure-bearing component 4 is pressurized, its bottom contracts and moves upward, synchronously pushing the switching member to switch the open and closed states of the flushing part 2 and the drilling part 3. In addition, the pressure-bearing component 4 adjusts the crude oil pressure supplied to the jet body 1 by the crude oil flushing system 300 in real time according to the changes in the pressure it is subjected to.

[0076] Reference Figures 3 to 6 As shown, the switching element includes:

[0077] The first switching portion 5 is located inside the jet body 1. When the first switching portion 5 is in a first position, the flushing portion 2 is in a partially open state; when the first switching portion 5 is in a second position, the flushing portion 2 is in a fully closed state.

[0078] The second switching portion 6 is located at the bottom of the jet body 1. When the second switching portion 6 is in the first position, the drilling portion 3 is in a partially open state; when the second switching portion 6 is in the second position, the drilling portion 3 is in a fully open state.

[0079] When the first switching part 5 and the second switching part 6 are in the first position, the crude oil pressure supplied by the crude oil flushing system 300 to the jet body 1 is in a first-level high-pressure state; when the first switching part 5 and the second switching part 6 are in the second position, the crude oil pressure supplied by the crude oil flushing system 300 to the jet body 1 is in a second-level high-pressure state.

[0080] Reference Figure 5 As shown, the first switching portion 5 includes a first interval 501 and a second interval 502. When the first switching portion 5 is in the first position, the first interval 501 partially blocks the flushing portion 2 on the jet body 1; when the first switching portion 5 is in the second position, the second interval 502 completely blocks the flushing portion 2 on the jet body 1.

[0081] The first switching portion 5 comprises an annular member, with an array of arc-shaped blocks disposed at its ends. When the arc-shaped blocks come into contact with the flushing portion 2, they partially block the flushing portion 2; when the annular member comes into contact with the flushing portion 2, they fully block the flushing portion 2. The arc-shaped blocks correspond to the first section 501, and the annular member corresponds to the second section 502.

[0082] Reference Figure 6 As shown, the second switching portion 6 includes a sealing member 601 , which is distributed at the bottom of the jet body 1 and is used to seal the drilling portion 3 .

[0083] The elastic portion 602 is distributed between the jet body 1 and the sealing member 601 . When the elastic portion 602 is in a contracted state, the sealing member 601 releases the sealing of the drilling portion 3 .

[0084] The sealing member 601 includes a closing portion and an opening portion. When the elastic portion 602 is in a contracted state, the opening portion of the sealing member 601 coincides with the drilling portion 3, and the flushing oil is sprayed out from the drilling portion 3; when the elastic portion 602 is in an extended state, the closing portion of the sealing member 601 coincides with the drilling portion 3, and the sealing member 601 seals the drilling portion 3.

[0085] Reference Figure 4 As shown, the pressure-bearing component 4 includes a pressure-bearing portion, which is located at the bottom of the jet body 1 .

[0086] The pushing part is located inside the jet body 1 and is provided with a pressure detection unit.

[0087] When the jet body 1 has not reached the bottom of the oil tank to be cleaned, the thickness and hardness of the sediment layer in the oil tank to be cleaned are obtained through the numerical changes of the pressure detection unit and the feed amount of the delivery pipe 7. The crude oil pressure supplied to the jet body 1 by the crude oil flushing system 300 is adjusted in real time based on the obtained information.

[0088] It should be noted that the pressure detection unit in this embodiment includes a pressure sensor, which is installed in the hydraulic unit 402 and is used to detect the contraction amount of the hydraulic unit 402. Since the height of the oil tank to be cleaned is constant, the thickness and hardness of the sediment layer in the oil tank to be cleaned can be calculated based on the changes in the value measured by the pressure sensor and the feed rate of the delivery pipe 7.

[0089] Reference Figure 4 As shown, the pressure receiving portion includes a sliding block 405 , which is located at the bottom of the jet body 1 and is slidably connected to the jet body 1 .

[0090] The wedge-shaped portion 406 is located outside the sliding block 405 and contacts the sealing member 601 .

[0091] When the sliding block 405 moves upward, the wedge-shaped portion 406 presses the blocking member 601 , forcing the elastic portion 602 to contract, so that the blocking member 601 releases the blocking of the drilling portion 3 .

[0092] Reference Figure 4 As shown, the pushing portion includes a bracket 401 , a telescopic member 404 connected to the first switching portion 5 is provided on the peripheral side of the bracket.

[0093] The hydraulic unit 402 is disposed on the top of the sliding block 405 , and the top of the hydraulic unit 402 is connected to the telescopic member 404 via a connecting pipe 403 , and the telescopic member 404 is connected to the first switching unit 5 .

[0094] When the sliding block 405 moves upward, it simultaneously squeezes the hydraulic part 402 , and the hydraulic oil in the hydraulic part 402 enters the interior of the telescopic member 404 through the connecting pipe 403 , so that the telescopic member 404 pushes the first switching part 5 to move downward.

[0095] The telescopic member 404 includes an elastic telescopic tube. Injecting liquid into the elastic telescopic tube to drive the tube to expand and contract is a prior art and will not be described in detail here.

[0096] The hydraulic unit 402 includes a piston, a rodless cavity of the piston is filled with hydraulic oil, and a piston rod of the piston is connected to the sliding block 405. The structure of the hydraulic unit 402 belongs to the prior art and will not be described in detail here.

[0097] During use, the same oil in the oil supply tank is pressurized by the cleaning pump 3001, heated to 70°C by the heat exchanger 3002, and then ejected from the flushing portion 2 of the jet body 1 to flush the interior of the oil tank to be cleaned. During the flushing process, the precession drive unit drives the delivery pipe 7, causing the jet body 1 to rotate and move downward, thereby achieving a comprehensive flushing of the interior of the oil tank to be cleaned.

[0098] During the process of jet body 1 rotating and moving downward, if jet body 1 has not yet reached the bottom of the oil tank to be cleaned, and the value of the pressure sensor exceeds the first threshold but is less than the second threshold, it indicates that the slider 405 has contacted the sediment layer and the sediment layer is relatively hard. At this time, the control system will adjust the operating power of the cleaning pump 3001 based on the value measured by the pressure sensor, increase the amount of flushing oil injected into the oil tank to be cleaned from the oil supply tank, and bring the pressure of jet body 1 to a high pressure state. This will increase the flushing intensity of the flushing oil on the oily sediment layer and avoid incomplete flushing of the oily sediment layer due to insufficient flushing oil pressure, resulting in some oil remaining in the oil tank to be cleaned.

[0099] When the pressure of the jet body 1 enters the first-level high-pressure state, the control system will control the suction power of the vacuum pump 2001, improve its suction capacity for the melted oil, reduce the residence time of the melted oil in the oil tank to be cleaned, and avoid the melted oil staying for too long, which will cause excessive buffering of the flushing oil injection and affect the flushing effect of the flushing oil on the oil deposit layer.

[0100] When the sliding block 405 contacts the sedimentary layer, the sedimentary layer exerts an upward force on the sliding block 405, causing it to gradually move upward. On the one hand, the top of the sliding block 405 squeezes the hydraulic unit 402, allowing the hydraulic oil in the hydraulic unit 402 to enter the telescopic member 404 through the connecting pipe 403, causing the telescopic member 404 to push the first switching member 5 downward to the first position. On the other hand, the wedge-shaped portion 406 at the bottom of the sliding block 405 squeezes the blocking member 601, causing it to move to the first position.

[0101] When the first switching portion 5 and the sealing member 601 are both moved to the first position, the first section 501 will partially block the flushing portion 2 distributed on the outside of the jet body 1, and the sealing member 601 will simultaneously release the partial blockage of the drilling portion 3. At this time, the flushing oil in the jet body 1 will be sprayed out from the flushing portion 2 and the drilling portion 3 respectively. Since the drilling portion 3 is located at the bottom of the jet body 1, the flushing oil sprayed from the drilling portion 3 will flush and drill the sediment layer, causing it to break and dissolve, thereby preventing the sediment layer from being too hard and affecting the downward movement of the jet body 1, thereby hindering the cleaning of the oil tank to be cleaned. At the same time, since the flushing portion 2 distributed on the jet body 1 is only partially blocked, while the drilling portion 3 is flushing and drilling the sediment layer, the other part of the flushing portion 2 that is not blocked will flush and melt the sides of the hole formed by the impact of the drilling portion 3, so as to expand the hole diameter and improve the cleaning effect of the oil tank to be cleaned.

[0102] When the flushing part 2 and the drilling part 3 flush the sediment layer synchronously, since the pressure in the jet body 1 is in a first-level high-pressure state, the intensity of the flushing oil sprayed from the flushing part 2 and the drilling part 3 will be higher than the intensity of the previous flushing oil, thereby better breaking and dissolving the sediment layer.

[0103] It's important to reiterate that, given the constant height of the oil tank to be cleaned, the thickness and hardness of the sediment layer in the tank can be inferred from changes in the pressure sensor readings and the feed rate of delivery pipe 7. Before the jet body 1 reaches the bottom of the tank, if the pressure sensor reading exceeds the first threshold but is less than the second threshold, it indicates that the slider 405 has contacted the sediment layer. At this point, the precession drive unit slows the downward movement of the delivery pipe 7, allowing the flushing section 2 and drilling section 3 to fully flush the sediment layer. Once the jet body 1 reaches the bottom of the tank, the precession drive unit drives the delivery pipe 7 upward, simultaneously slowing its upward movement. This allows the flushing section 2 to fully flush any remaining sediment layer, preventing incomplete flushing of the sediment layer by a portion of the flushing section 2. When the delivery pipe 7 reaches the height at which the slider 405 contacts the sediment layer, the precession drive unit drives the delivery pipe 7 upward at the set (normal) speed.

[0104] It should be noted that a trumpet-shaped structure is provided within connecting tube 403 to allow the hydraulic oil in hydraulic unit 402 to quickly pass through connecting tube 403 and into telescopic member 404. However, the hydraulic oil's return speed from telescopic member 404 to hydraulic unit 402 is reduced. This prevents the sliding block 405 from rapidly reciprocating due to an excessively fast melting rate when drilling unit 3 is flushing and melting the deposited layer, thereby affecting the cleaning effect of the oil tank being cleaned. The use of a trumpet structure to achieve rapid inflow and slow outflow of hydraulic oil is a prior art technique and will not be further elaborated upon here.

[0105] During the process of jet body 1 rotating and moving downward, if jet body 1 has not yet reached the bottom of the oil tank to be cleaned and the pressure sensor value exceeds the second threshold, it indicates that slider 405 has contacted the sediment layer and the sediment layer is very hard. At this time, the control system will further adjust the operating power of cleaning pump 3001 based on the value measured by the pressure sensor, increase the amount of flushing oil injected into the oil tank to be cleaned from the oil supply tank, and bring the pressure of jet body 1 to the second high pressure state, thereby increasing the flushing intensity of the flushing oil on the oil-contaminated sediment layer and avoiding incomplete flushing of the oil-contaminated sediment layer due to insufficient flushing oil pressure.

[0106] When the pressure of the jet body 1 enters the secondary high-pressure state, the control system will control the suction power of the vacuum pump 2001, improve its suction capacity of the melted oil, reduce the residence time of the melted oil in the oil tank to be cleaned, and avoid excessive buffering of the flushing oil spray, affecting the flushing effect.

[0107] When the sliding block 405 contacts the sedimentary layer, the sedimentary layer exerts an upward force on the sliding block 405, causing it to gradually move upward. On the one hand, the top of the sliding block 405 squeezes the hydraulic unit 402, allowing the hydraulic oil in the hydraulic unit 402 to enter the telescopic member 404 through the connecting pipe 403, pushing the first switching member 5 downward to the second position. On the other hand, the wedge-shaped portion 406 at the bottom of the sliding block 405 squeezes the blocking member 601, causing it to move to the second position.

[0108] When both the first switching portion 5 and the sealing member 601 move to the second position, the first section 501 completely blocks the flushing portion 2 outside the jet body 1, while the sealing member 601 simultaneously releases all blocks on the drilling portion 3. At this point, the flushing oil shifts from being ejected from the flushing portion 2 outside the jet body 1 to being ejected from the drilling portion 3 at the bottom of the jet body 1. This concentrates the impact force of the flushing oil on the top of the sediment layer, thereby flushing and breaking it up. This prevents the ineffectiveness of the sediment layer treated by the simultaneous flushing of the flushing portion 2 and drilling portion 3 due to its high hardness.

[0109] Since the pressure in the jet body 1 has entered the secondary high pressure state, the intensity of the flushing oil sprayed from the drilling part 3 will be much higher than the intensity of the previous flushing oil, thereby better drilling the sediment layer and preventing the sediment layer from affecting the downward movement of the jet body 1.

[0110] Given the constant height of the oil tank to be cleaned, the thickness and hardness of the sediment layer within the tank can be inferred from changes in the pressure sensor readings and the feed rate of the delivery pipe 7. When the pressure sensor reading exceeds the second threshold, after the jet body 1 reaches the tank bottom, the sliding block 405 loses its thrust and begins to gradually move downward as the jet body 1 gradually rises. At this point, the elastic restoring force of the elastic portion 602 causes the sealing member 601 to block the drilling portion 3. Simultaneously, the hydraulic oil entering the telescopic member 404 gradually flows back into the hydraulic portion 402, and the first switching member 5 releases its obstruction of the flushing portion 2. Flushing oil is then ejected from the flushing portion 2 again, and the pressure within the jet body 1 remains at the secondary high pressure level. When the delivery pipe 7 ascends to the point where the sliding block 405 contacts the sediment layer, it is driven downward again, allowing the flushing portion 2 to perform a reciprocating cleaning of the sediment layer (the specific number of reciprocating cycles can be set according to actual needs). After the reciprocating cleaning is completed, the control system will control the crude oil flushing system 300 to restore the pressure of the crude oil supplied to the jet body 1 to a normal state.

[0111] It should be emphasized again that after the jet body 1 reaches the bottom of the oil tank to be cleaned, the screw-in drive unit will drive the delivery pipe 7 to move upward and slow down the upward movement speed, so that the flushing part 2 can fully flush the sediment layer.

[0112] In addition, when flushing the sediment layer, the control system will simultaneously increase the temperature of the flushing oil by changing the parameters of the heat exchanger 3002 to improve the flushing effect of the flushing oil on the sediment layer.

[0113] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An oil tank flushing device, characterized in that: It comprises a crude oil flushing system (300), an oil tank to be cleaned, and a suction separation system (200) connected in a closed loop; The oil tank to be cleaned is provided with a dirty oil cleaning system, and the dirty oil cleaning system comprises: A jet body (1) is connected to a crude oil flushing system (300) via a delivery pipe (7), a flushing portion (2) is provided on its outer side, and a drilling portion (3) is provided on its bottom; A pressure-bearing component (4), which is located in the middle of the jet body (1) and is in communication with the crude oil flushing system (300); The pressure-bearing component (4) is provided with a pressure detection unit, which determines the hardness of the sediment layer at the bottom of the oil tank to be cleaned, so that the switching component can adjust the working state of the flushing part (2) and the drilling part (3) in real time, and cooperate with the crude oil flushing system (300) to achieve graded control of the flushing pressure; The switching element includes: A first switching portion (5) is located inside the jet body (1); when the first switching portion is in a first position, the flushing portion (2) is in a partially open state; when the first switching portion is in a second position, the flushing portion (2) is in a fully closed state; A second switching portion (6) is located at the bottom of the jet body (1); when the second switching portion is in a first position, the drilling portion (3) is in a partially open state; when the second switching portion is in a second position, the drilling portion (3) is in a fully open state; The pressure-bearing component (4) comprises: a pressure-bearing portion located at the bottom of the jet body (1); A pushing portion, which is located inside the jet body (1) and is provided with a pressure detection unit; When the jet body (1) has not reached the bottom of the oil tank to be cleaned, the thickness and hardness of the sediment layer in the oil tank to be cleaned are obtained through the value change of the pressure detection unit and the feed rate of the delivery pipe (7), and the pressure of the crude oil supplied to the jet body (1) by the crude oil flushing system (300) is adjusted in real time based on the obtained information; The pressure-bearing portion includes: A sliding block (405) is located at the bottom of the jet body (1) and is slidably connected to the jet body (1); a wedge-shaped portion (406) located outside the sliding block (405); The pushing portion includes: A bracket (401) is provided with a telescopic member (404) connected to the first switching portion (5) on its circumferential side; A hydraulic part (402) is provided on the top of the sliding block (405), and its top is connected to a telescopic member (404) via a connecting pipe (403), and the telescopic member (404) is connected to the first switching part (5); The pressure detection unit includes a pressure sensor, which is arranged in the hydraulic part (402) and is used to detect the contraction amount of the hydraulic part (402).

2. The oil tank flushing device according to claim 1, characterized in that: When the first switching portion (5) and the second switching portion (6) are in the first position, the pressure of the crude oil supplied by the crude oil flushing system (300) to the jet body (1) is in a first-level high-pressure state; When the first switching portion (5) and the second switching portion (6) are in the second position, the pressure of the crude oil supplied by the crude oil flushing system (300) to the jet body (1) is in a secondary high pressure state.

3. The oil tank flushing device according to claim 2, characterized in that: The first switching unit (5) comprises: The first section (501) and the second section (502) are such that when the first switching portion (5) is in the first position, the first section (501) partially blocks the flushing portion (2) on the jet body (1); and when the first switching portion (5) is in the second position, the second section (502) completely blocks the flushing portion (2) on the jet body (1).

4. The oil tank flushing device according to claim 2, characterized in that: The second switching unit (6) includes: A sealing member (601) is distributed at the bottom of the jet body (1) and is used to seal the drilling portion (3); the sealing member (601) is in contact with the wedge-shaped portion (406); The elastic portion (602) is distributed between the jet body (1) and the blocking member (601), and when the elastic portion (602) is in a contracted state, the blocking member (601) releases the blocking of the drilling portion (3).

5. The oil tank flushing device according to claim 1, characterized in that: The crude oil flushing system (300) comprises an oil supply tank, a cleaning pump (3001) is provided at the bottom of the oil supply tank, the other end of the cleaning pump (3001) is connected to a heat exchanger (3002), and the heat exchanger (3002) is used to heat the flushing oil and pass the heated flushing oil into the jet body (1).

6. The oil tank flushing device according to claim 5, characterized in that: The suction separation system (200) includes a vacuum pump (2001) arranged at the bottom of the oil tank to be cleaned. The vacuum pump (2001) passes the dirty oil into the filter (2002), and the filter (2002) filters the dirty oil. The filtered dirty oil passes into the suction tank (2003), and then the sludge is passed into the oil-water separation tank (2005) through the recovery pump (2004) for oil-water separation. The separated clean oil is sent to the recovery tank by the floating oil recovery pump (2006).

7. The oil tank flushing device according to claim 5, characterized in that: A first on-off valve is provided between the cleaning pump (3001) and the oil supply tank. When the first on-off valve is in an open state, the cleaning pump (3001) sucks the flushing oil inside the oil supply tank. A second stop valve is provided between the oil-water separation tank (2005) and the cleaning pump (3001). When the second stop valve is in an open state, the cleaning pump (3001) sucks the clean water separated from the oil-water separation tank (2005).

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