Oil tank flushing device

Abstract

The invention relates to the technical field of oil tank flushing, in particular to an oil tank flushing device which comprises a crude oil flushing system, an oil tank to be cleaned and a suction separation system which are connected in a closed loop mode. A dirty oil cleaning system is arranged in the oil tank to be cleaned and comprises a jet flow main body, the jet flow main body is connected with a crude oil flushing system through a conveying pipe, flushing parts are distributed on the outer side of the jet flow main body, and drilling parts are distributed at the bottom of the jet flow main body; the pressure bearing assembly is located in the middle of the jet flow body and is in communication connection with the crude oil flushing system; a pressure detection unit is arranged on the pressure bearing assembly and judges the hardness of a deposition layer at the bottom of the oil tank to be cleaned so that the switching piece can adjust the working states of the flushing part and the drilling part in real time, and the switching piece is matched with a crude oil flushing system to achieve flushing pressure grading regulation and control. The working states of the flushing part and the drilling part are automatically adjusted through the pressure bearing assembly according to the condition of a deposition layer at the bottom of the oil tank, flushing, drilling and crushing are conducted on the deposition layer, and the cleaning effect of the oil tank is improved.

Description

Technical Field

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

[0002] After long-term operation of an oil storage tank, sludge containing sulfides, waxes, gums and other components will accumulate at the bottom of the tank, resulting in tank body corrosion, reduction of effective volume, and potential safety hazards such as hydrogen sulfide poisoning and oil and gas flash explosion. Therefore, it is necessary to regularly clean the oil tank.

[0003] The traditional mechanical tank cleaning technology is to drain the bottom oil of the storage tank to be cleaned, and then use the heated and pressurized cleaning liquid to spray and clean the bottom and wall of the storage tank to dissolve the residual viscous crude oil and sludge in the tank. Then, the recovered cleaning medium is treated by a three-phase separation device, and finally, each part of the storage tank is repeatedly cleaned with warm water or steam until the expected effect is achieved. However, in the actual application process, the mechanical tank cleaning technology will transfer the original oil tank sludge at the bottom of the oil storage tank to other oil storage tanks, without purifying and recycling the oil tank sludge, resulting in waste of resources.

[0004] Chinese Patent with Application No. 202010133025.4 discloses an oil storage tank mechanical cleaning waste oil purification system, including a cleaning system and a purification system. The cleaning system includes an oil storage tank and a mechanical cleaning device, and the purification system includes a buffer unit, a heat exchange unit, a two-phase horizontal centrifugal unit, a sedimentation separation unit and a three-phase disc centrifugal unit. The cleaning system and the purification system are set up, and the cleaning system and the purification system are connected by valves to supply liquid to the purification system while circulating cleaning, so as to realize the waste oil purification in the same oil cleaning link without stopping cleaning; at the same time, the cleaning system and the purification system can be used separately or in a complete set; by setting the buffer unit, the problem of mismatched flow rates between the cleaning system and the purification system can be solved, so that the two systems can operate simultaneously and the disposal efficiency can be improved; the cleaning system and the purification system provided by the present invention are physical separation processes, without adding chemical agents, will not cause secondary pollution to the oil products, and have simple processes.

[0005] Although the foregoing patent technical solution achieves the goal of efficient purification of waste oil in the same oil product cleaning process through the organic combination of the cleaning system and the purification system, in actual engineering applications, the oil stains accumulated at the bottom of the oil tank for a long time exhibit significant sedimentation characteristics, specifically manifested as a complex mixture with high viscosity, and its composition includes multiple substances such as gums, waxes, rust particles and sediment impurities. During the continuous solidification process of such sediments at the bottom of the oil tank, a block structure with high hardness or a dense accumulation layer may be formed, significantly increasing the cleaning difficulty.

[0006] Although the mainstream mechanical cleaning equipment in the current market has the ability to comprehensively clean the internal space of the tank, it has technical limitations in dealing with the sediment layer at the bottom of the tank. Such equipment usually lacks an effective mechanism for physically breaking or chemically dissolving the sediment layer. As a result, after the cleaning operation is completed, the sediment still adheres to the bottom of the tank in a residual form, and it is impossible to achieve complete removal, which in turn affects the long-term operation efficiency and safety performance of the oil tank.

[0007] Therefore, in view of the limitations of the current oil tank flushing, it is particularly urgent and important to develop an oil tank flushing device to promote 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 proposed in the above background technology.

[0009] To achieve the above purpose, the present invention provides the following technical solutions: An oil tank flushing device includes a crude oil flushing system, an oil tank to be cleaned, and a suction separation system that are connected in a closed loop; A dirty oil cleaning system is provided inside the oil tank to be cleaned, and the dirty oil cleaning system includes: A jet main body, which is connected to the crude oil flushing system through a delivery pipe, has a flushing part distributed on its outer side, and a drilling part distributed on its bottom; A pressure-bearing component, which is located in the middle of the jet main body and is communicatively connected to the crude oil flushing system; A pressure detection unit is provided on the pressure-bearing component, and the pressure detection unit judges the hardness of the sediment layer at the bottom of the oil tank to be cleaned, so that the switching part can adjust the working states of the flushing part and the drilling part in real time, and cooperate with the crude oil flushing system to realize hierarchical regulation of the flushing pressure.

[0010] Preferably, the pressure-bearing component includes: A pressure-receiving part, which is located at the bottom of the jet main body; A pushing part, which is located inside the jet main body and is provided with a pressure detection unit thereon; When the jet main 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 change of the pressure detection unit and the feeding amount of the delivery pipe, and the crude oil pressure supplied by the crude oil flushing system to the jet main body is adjusted in real time according to the obtained information.

[0011] Preferably, the switching part includes: A first switching part, which is located inside the jet main body. When it is in the first position, the flushing part is in a partially open state; when it is in the second position, the flushing part is in a fully closed state; The second switching part is located at the bottom of the jet body. When it is in the first position, the drilling part is in a partially open state; when it is in the second position, the drilling part is in a fully open state. When the first switching part and the second switching part are in the first position, the crude oil pressure supplied by the crude oil flushing system into the jet body is in a primary high-pressure state; when the first switching part and the second switching part are in the second position, the crude oil pressure supplied by the crude oil flushing system into the jet body is in a secondary high-pressure state.

[0012] Preferably, the first switching part includes: 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.

[0013] Preferably, the second switching part includes: Blocking members, which are distributed at the bottom of the jet body and are used to block the drilling part. Elastic parts, which are distributed between the jet body and the blocking members. When they are in a contracted state, the blocking members release the block on the drilling part.

[0014] Preferably, the pressure-receiving part includes: A sliding block, which is located at the bottom of the jet body and is slidably connected to the jet body. A wedge part, which is located outside the sliding block and is in contact with the blocking member.

[0015] Preferably, the pushing part includes: A bracket, on the periphery of which there is a telescopic member connected to the first switching part. A hydraulic part, which is arranged on the top of the sliding block. The top of it is connected to the telescopic member through a connecting pipe, and the telescopic member is connected to the first switching part.

[0016] Preferably, the crude oil flushing system includes an oil supply tank. A cleaning pump is provided at the bottom of the oil supply tank, and the other end of the cleaning pump is communicated with a heat exchanger. The heat exchanger is used to heat the flushing oil and inject the heated flushing oil into the jet body.

[0017] 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 a filter, and the filter filters the dirty oil. The filtered dirty oil is passed into a suction tank, and then the sludge is passed into an oil-water separation tank through a recovery pump for oil-water separation. The separated clean oil is sent into a recovery oil tank by a floating oil recovery pump.

[0018] Preferably, a first check valve is provided between the cleaning pump and the oil supply tank. When the first check valve is in the open state, the cleaning pump sucks the flushing oil inside the oil supply tank. A second check valve is provided between the oil-water separation tank and the cleaning pump. When the second check valve is in the open state, the cleaning pump sucks the clear water separated by the oil-water separation tank.

[0019] Technical effects and advantages of the present invention: 1. Based on the detected values of the pressure detection unit and the feed rate of the delivery pipe, the device calculates the thickness and hardness of the deposition layer. According to the calculated information, it regulates the crude oil pressure supplied by the crude oil flushing system and switches the opening and closing states of the flushing part and the drilling part in real time; when encountering a deposition layer with high hardness, it enables the drilling part to function, flushes and drills the deposition layer, and at the same time the flushing part flushes and melts the periphery of the hole to expand the hole diameter; this targeted cleaning method greatly improves the cleaning effect of the deposition layer at the bottom of the oil tank, effectively avoids the problem of sediment residue, and ensures the normal operation of the oil tank subsequently. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the main process of the oil tank flushing of the present invention; Figure 2 It is a schematic diagram of the structure of the oil tank flushing of the present invention; Figure 3 It is a schematic diagram of the structure of the main body of the nozzle of the present invention; Figure 4 It is a schematic diagram of the internal structure of the main body of the nozzle of the present invention; Figure 5 It is a schematic diagram of the structure of the shielding part of the present invention; Figure 6 It is a schematic diagram of the structure of the telescopic shielding member of the present invention; Figure 7 It is a schematic diagram of the structure of the connecting pipe of the present invention.

[0021] Reference numerals are: 1, jet body; 2, flushing part; 3, drilling part; 4, pressure-bearing assembly; 401, bracket; 402, hydraulic part; 403, connecting pipe; 404, telescopic member; 405, sliding block; 406, wedge part; 5, first switching part; 501, first interval; 502, second interval; 6, second switching part; 601, blocking member; 602, elastic part; 7, delivery pipe; 100, explosion-proof system; 1001, inert gas generator; 1002, oxygen content detection system; 200, Suction separation system; 2001, Vacuum pump; 2002, Filter; 2003, Suction tank; 2004, Recovery pump; 2005, Oil-water separation tank; 2006, Floating oil recovery pump; 300, Crude oil flushing system; 3001, Cleaning pump; 3002, Heat exchanger. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0023] Refer to Figures 1 to 7 As shown, the present invention provides an oil tank flushing device, including a jet main body 1. A delivery pipe 7 is provided at the top of the jet main body 1, and a swirling drive unit is connected to the end of the delivery pipe 7.

[0024] Refer to Figures 1 to 2 As shown, the jet main body 1 is located inside the oil tank to be cleaned. An explosion-proof system 100 is provided at the top of the oil tank to be cleaned. By injecting inert gas into the inside of the oil tank to be cleaned, explosion protection is achieved.

[0025] The explosion-proof system 100 includes an inert gas generator 1001 and an oxygen content detection system 1002. The inert gas generator 1001 passes inert gas (such as nitrogen) into the inside of the oil tank to be cleaned through a pipeline to ensure that the oxygen concentration introduced into the inside of the oil tank to be cleaned is diluted to less than 8%, eliminating the "combustion supporter" among the three elements of combustion from a physical level; the oxygen content detection system 1002 is used to detect the oxygen concentration inside the oil tank to be cleaned in real time to dynamically adjust the amount of gas introduced into the inside of the oil tank to be cleaned by the inert gas generator 1001.

[0026] Refer to Figure 1 As shown, a crude oil flushing system 300 is provided outside the oil tank to be cleaned. The crude oil flushing system 300 is connected to the jet main body 1. By injecting flushing oil into the jet main body 1, the tank body is flushed.

[0027] The crude oil flushing system 300 includes an oil supply tank. The inside of the oil supply tank has the same flushing oil as the inside 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 communicated with a heat exchanger 3002. The heat exchanger 3002 is used to heat the flushing oil and pass the heated flushing oil into the jet main body 1, and the inside of the oil tank to be cleaned is flushed by the jet main body 1.

[0028] It should be noted that: a first check valve is provided between the cleaning pump 3001 and the oil supply tank. When the first check valve is in the open state, the cleaning pump 3001 sucks the flushing oil inside the oil supply tank.

[0029] Refer to Figure 1 As shown, a suction separation system 200 is provided at the bottom of the oil tank to be cleaned to achieve the suction and purification of the oil stains inside the oil tank to be cleaned.

[0030] 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 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 sludge. The dirty oil filtered by the filter 2002 is sent to the suction tank 2003, and then the sludge is sent to the oil-water separation tank 2005 through the recovery pump 2004 for oil-water separation operation. The separated clean oil is sent to the recovery oil tank through the floating oil recovery pump 2006.

[0031] It should be noted that: a second check valve is provided between the oil-water separation tank 2005 and the cleaning pump 3001. When the second check valve is in the open state, the cleaning pump 3001 sucks the clear water separated by the oil-water separation tank 2005.

[0032] During use, the mechanical cleaning equipment is connected to the oil tank to be cleaned, the oil supply tank, and the oil product recovery storage tank through temporarily laid pipelines. The flowable oil products at the bottom of the oil tank to be cleaned are transferred to the oil product recovery tank by the vacuum pump 2001. Then, an inert gas such as nitrogen is injected into the tank by means of the inert gas generator 1001 to maintain the oxygen content in the tank at a safe level below 8%. The same kind of oil in the oil supply tank is pressurized by the cleaning pump 3001 and heated to about 70 °C by the heat exchanger 3002, and hot oil with a certain speed and pressure is ejected through the jet body 1 to break and dissolve the remaining solidified residual oil and sludge in the tank. The flowable sludge dissolved in the tank is filtered by the filter 2002 to remove solid residues 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, while the clear water is heated as a cleaning medium after the same kind of oil cleaning is completed (i.e., there is no residual sludge in the tank) and then used to clean the tank wall again to meet the conditions for in-tank maintenance and hot work or to meet the subsequent oil change requirements. Embodiment 2

[0033] Although the above embodiments combine the suction separation system 200 with the crude oil flushing system 300 to achieve efficient purification of waste oil in the cleaning of the same type of oil product, in actual engineering, the oil stains accumulated at the bottom of the oil tank for a long time have significant sedimentation characteristics and are a complex mixture with high viscosity, containing gum, wax, rust particles, sediment impurities, etc. These sediments are prone to form a high-hardness block structure or a dense accumulation layer after solidification, increasing the cleaning difficulty. Although the current mainstream mechanical cleaning equipment in the market can comprehensively clean the interior of the tank body, there are technical limitations in dealing with the sediment layer at the bottom of the tank, lacking an effective mechanism for physically breaking or chemically dissolving the sediment layer, resulting in sediment residues and affecting the long-term operation efficiency and safety of the oil tank.

[0034] Referring to Figures 1 to 7 As shown, the present invention provides an oil tank flushing device, which includes a crude oil flushing system 300, an oil tank to be cleaned, and a suction separation system 200 that are connected in a closed loop.

[0035] A waste oil cleaning system is provided inside the oil tank to be cleaned, and the waste oil cleaning system includes: A jet main body 1, on which a delivery pipe 7 is provided. The delivery pipe 7 is connected to the crude oil flushing system 300, and the end of the delivery pipe 7 is connected with a swirling driving unit.

[0036] A flushing part 2 and a drilling part 3. The flushing part 2 is distributed on the outside of the jet main body 1, and the drilling part 3 is distributed at the bottom of the jet main body 1.

[0037] A pressure-bearing component 4, which is located in the middle of the jet main body 1 and is communicatively connected with the crude oil flushing system 300.

[0038] A switching part, which is located outside the pressure-bearing component 4. When the pressure-bearing component 4 is pressurized, its bottom shrinks and moves upward, synchronously pushing the switching part to switch the opening and closing states of the flushing part 2 and the drilling part 3; in addition, the pressure-bearing component 4 adjusts in real time the crude oil pressure supplied by the crude oil flushing system 300 to the jet main body 1 according to the change in the pressure received.

[0039] Referring to Figures 3 to 6 As shown, the switching part includes: A first switching part 5, which is located inside the jet main body 1. When it is in the first position, the flushing part 2 is in a partially open state; when it is in the second position, the flushing part 2 is in a fully closed state.

[0040] A second switching part 6, which is located at the bottom of the jet main body 1. When it is in the first position, the drilling part 3 is in a partially open state; when it is in the second position, the drilling part 3 is in a fully open state.

[0041] 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 the 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 the second-level high-pressure state.

[0042] Refer to Figure 5 As shown, the first switching part 5 includes a first section 501 and a second section 502. When the first switching part 5 is in the first position, the first section 501 partially blocks the flushing part 2 on the jet body 1; when the first switching part 5 is in the second position, the second section 502 completely blocks the flushing part 2 on the jet body 1.

[0043] The first switching part 5 includes an annular part. The end of the annular part is provided with arc-shaped blocks distributed in an array. After the arc-shaped blocks contact the flushing part 2, they partially block the flushing part 2; after the annular part contacts the flushing part 2, it completely blocks the flushing part 2. The arc-shaped blocks correspond to the first section 501, and the annular part corresponds to the second section 502.

[0044] Refer to Figure 6 As shown, the second switching part 6 includes a blocking part 601, which is distributed at the bottom of the jet body 1 and is used to block the drilling part 3.

[0045] An elastic part 602, which is distributed between the jet body 1 and the blocking part 601. When it is in a contracted state, the blocking part 601 releases the block on the drilling part 3.

[0046] The blocking part 601 includes a closed part and an opening part. When the elastic part 602 is in a contracted state, the opening part of the blocking part 601 coincides with the drilling part 3, and the flushing oil can be ejected from the drilling part 3; when the elastic part 602 is in an extended state, the closed part of the blocking part 601 coincides with the drilling part 3, and the blocking part 601 blocks the drilling part 3.

[0047] Refer to Figure 4 As shown, the pressure-bearing assembly 4 includes a pressure-receiving part, which is located at the bottom of the jet body 1.

[0048] A pushing part, which is located inside the jet body 1 and is provided with a pressure detection unit thereon.

[0049] Before the jet body 1 reaches 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 change of the pressure detection unit and the feeding amount of the conveying pipe 7, and the crude oil pressure supplied by the crude oil flushing system 300 to the jet body 1 is adjusted in real time according to the obtained information.

[0050] It should be particularly noted that the pressure detection unit in this embodiment includes a pressure sensor, which is disposed in the hydraulic part 402 and is used to detect the contraction amount of the hydraulic part 402. Given that 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 deduced based on the change in the value measured by the pressure sensor and the feed amount of the delivery pipe 7.

[0051] Referring to Figure 4 As shown, the pressure-receiving part 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.

[0052] A wedge part 406, which is located outside the sliding block 405 and is in contact with the blocking member 601.

[0053] When the sliding block 405 moves upward, the wedge part 406 squeezes the blocking member 601, forcing the elastic part 602 to contract, so that the blocking member 601 releases the block on the drilling part 3.

[0054] Referring to Figure 4 As shown, the pushing part includes a bracket 401, and a telescopic member 404 connected to the first switching part 5 is provided on the peripheral side thereof.

[0055] A hydraulic part 402, which is disposed on the top of the sliding block 405, and the top thereof is connected to the telescopic member 404 through a connecting pipe 403, and the telescopic member 404 is connected to the first switching part 5.

[0056] When the sliding block 405 moves upward, the hydraulic part 402 is simultaneously squeezed, and the hydraulic oil in the hydraulic part 402 enters the inside of the telescopic member 404 through the connecting pipe 403, so that the telescopic member 404 pushes the first switching part 5 downward.

[0057] The telescopic member 404 includes an elastic telescopic tube. Driving its expansion and contraction by injecting liquid into the elastic telescopic tube belongs to the prior art and will not be elaborated here too much.

[0058] The hydraulic part 402 includes a piston member. Hydraulic oil is provided in the rodless cavity of the piston member, and the piston rod of the piston member is connected to the sliding block 405. The structure of the hydraulic part 402 belongs to the prior art and will not be elaborated here too much.

[0059] During use, the same kind of oil in the supply oil tank is pressurized by the cleaning pump 3001, heated to 70 °C by the heat exchanger 3002, and then sprayed out from the flushing part 2 of the jet body 1 to flush the inside of the oil tank to be cleaned. During the flushing process, the rotation driving unit drives the delivery pipe 7 to drive the jet body 1 to rotate and move downward, so as to achieve a comprehensive flushing of the inside of the oil tank to be cleaned.

[0060] During the rotation and downward movement of the jet body 1, if the jet body 1 has not 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 has a high hardness. At this time, the control system will regulate the operating power of the cleaning pump 3001 according to the value measured by the pressure sensor, increase the flushing oil volume injected from the oil supply tank into the oil tank to be cleaned, and make the pressure of the jet body 1 enter the first-level high-pressure state, so as to enhance the flushing intensity of the flushing oil on the oil stain sediment layer, and avoid incomplete flushing of the oil stain sediment layer due to insufficient flushing oil pressure, resulting in some oil stains still remaining in the oil tank to be cleaned.

[0061] After 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 stains, reduce the residence time of the melted oil stains in the oil tank to be cleaned, and avoid excessive buffering of the injection of the flushing oil caused by too long residence time of the melted oil stains, which affects the flushing effect of the flushing oil on the oil stain sediment layer.

[0062] After the slider 405 contacts the sediment layer, the sediment layer will exert an upward driving force on the slider 405, causing it to gradually move upward. On the one hand, the top of the slider 405 will squeeze the hydraulic part 402, so that the hydraulic oil in the hydraulic part 402 enters the inside of the telescopic part 404 through the connecting pipe 403, so that the telescopic part 404 pushes the first switching part 5 down to the first position; on the other hand, the wedge part 406 at the bottom of the slider 405 will squeeze the blocking part 601, causing it to move to the first position.

[0063] After the first switching part 5 and the blocking part 601 both move to the first position, the first interval 501 will partially block the flushing part 2 distributed outside the jet body 1, and at the same time the blocking part 601 will synchronously release the partial blocking of the drilling part 3. At this time, the flushing oil in the jet body 1 will be ejected from the flushing part 2 and the drilling part 3 respectively. Since the drilling part 3 is located at the bottom of the jet body 1, the flushing oil ejected from the drilling part 3 will flush and drill the sediment layer, making it broken and dissolved, avoiding the sediment layer being too hard to affect the downward movement of the jet body 1 and hindering the cleaning of the oil tank to be cleaned. At the same time, since only a part of the flushing part 2 distributed on the jet body 1 is blocked, while the drilling part 3 flushes and drills the sediment layer, the other unblocked flushing part 2 will flush and melt the periphery of the hole formed by the impact of the drilling part 3 to expand the hole diameter and improve the cleaning effect of the oil tank to be cleaned.

[0064] 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 the first-level high-pressure state, the intensity of the flushing oil ejected from the flushing part 2 and the drilling part 3 will be higher than that of the previous flushing oil, so as to better break and dissolve the sediment layer.

[0065] It should be emphasized again that given the constant height of the oil tank to be cleaned, the thickness and hardness of the sediment layer in the oil tank to be cleaned can be deduced from the change in the value measured by the pressure sensor and the feed rate of the delivery pipe 7. When the main jet 1 has not reached the bottom of the oil tank to be cleaned, if the value of the pressure sensor exceeds the first threshold but is less than the second threshold, it indicates that the sliding block 405 has contacted the sediment layer. At this time, the screw-in drive unit will slow down the downward movement speed of the delivery pipe 7, so that the flushing part 2 and the drilling part 3 can fully flush the sediment layer. After the main jet 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 synchronously slow down the upward movement speed, so that the flushing part 2 can comprehensively flush the remaining sediment layer, avoiding imperfect flushing of the sediment layer by some flushing parts 2. When the delivery pipe 7 moves upward to the height where the sliding block 405 contacts the sediment layer, the screw-in drive unit will drive the delivery pipe 7 to move upward at a set (normal) speed.

[0066] It should be specifically noted that a horn-shaped structure is provided inside the connecting pipe 403, so that the hydraulic oil in the hydraulic part 402 can quickly enter the inside of the telescopic part 404 through the connecting pipe 403, but the speed of the hydraulic oil returning from the inside of the telescopic part 404 to the hydraulic part 402 will be reduced, so as to avoid the sliding block 405 from moving back and forth rapidly due to too fast melting rate when the drilling part 3 flushes and melts the sediment layer, thereby affecting the cleaning effect of the oil tank to be cleaned. Realizing the fast in and slow out of the hydraulic oil by setting the horn structure belongs to the prior art and will not be elaborated here.

[0067] During the process of the main jet 1 rotating and moving downward, if the main jet 1 has not reached the bottom of the oil tank to be cleaned and the value of the pressure sensor exceeds the second threshold, it indicates that the sliding block 405 has contacted the sediment layer and the sediment layer has a very high hardness. At this time, the control system will further regulate the operating power of the cleaning pump 3001 according to the value measured by the pressure sensor, increase the amount of flushing oil injected from the oil supply tank into the oil tank to be cleaned, so that the pressure of the main jet 1 enters the secondary high-pressure state, so as to enhance the flushing intensity of the flushing oil on the oil stain sediment layer and avoid incomplete flushing of the oil stain sediment layer due to insufficient flushing oil pressure.

[0068] After the pressure of the main jet 1 enters the secondary high-pressure state, the control system will control the suction power of the vacuum pump 2001, improve its suction capacity for the melted oil stains, reduce the residence time of the melted oil stains in the oil tank to be cleaned, and avoid excessive buffering of the injection of the flushing oil by the melted oil stains, affecting the flushing effect.

[0069] After the sliding block 405 comes into contact with the sediment layer, the sediment layer will exert an upward driving force on the sliding block 405, causing it to gradually move upward. On the one hand, the top of the sliding block 405 will squeeze the hydraulic part 402, causing the hydraulic oil in the hydraulic part 402 to enter the inside of the telescopic part 404 through the connecting pipe 403, and pushing the first switching part 5 downward to the second position; on the other hand, the wedge part 406 at the bottom of the sliding block 405 will squeeze the blocking part 601, causing it to move to the second position.

[0070] After both the first switching part 5 and the blocking part 601 move to the second position, the first interval 501 will completely block the flushing part 2 distributed outside the jet body 1, and at the same time the blocking part 601 will synchronously release the complete blocking of the drilling part 3. At this time, the flushing oil will change from the state of spraying from the flushing part 2 outside the jet body 1 to the state of spraying from the drilling part 3 at the bottom of the jet body 1, so that the impact force generated by the flushing oil is all concentrated on the top of the sediment layer, thereby flushing and breaking the sediment layer, and avoiding the situation that the sediment layer is too hard, resulting in the ineffectiveness of the simultaneous flushing method of the flushing part 2 and the drilling part 3.

[0071] Since the pressure in the jet body 1 has entered the second-stage 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, so as to better perform the drilling operation on the sediment layer and avoid the sediment layer from affecting the downward movement of the jet body 1.

[0072] Given that 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 deduced through the change of the measured value of the pressure sensor and the feed amount of the delivery pipe 7. When the value of the pressure sensor exceeds the second threshold, after the jet body 1 runs to the bottom of the tank, as the jet body 1 gradually rises, the sliding block 405 will lose the thrust and start to gradually move downward. At this time, affected by the elastic restoring force of the elastic part 602, the blocking part 601 will block the drilling part 3; at the same time, the hydraulic oil entering the telescopic part 404 will gradually flow back to the hydraulic part 402, and the first switching part 5 will release the blocking of the flushing part 2. At this time, the flushing oil will be sprayed from the flushing part 2 again, and the pressure in the jet body 1 will still remain in the second-stage high-pressure state. When the delivery pipe 7 moves up to the height where the sliding block 405 contacts the sediment layer, the delivery pipe 7 will be driven to move downward again, so that the flushing part 2 performs reciprocating flushing on the sediment layer (the specific number of reciprocations can be set according to actual needs). After the reciprocating flushing 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 the normal state.

[0073] It should be emphasized again that after the jet body 1 reaches the bottom of the oil tank to be cleaned, the rotation 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.

[0074] In addition, when flushing the deposition layer, the control system will synchronously 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 deposition layer.

[0075] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. An oil tank flushing device, characterized in that, It includes a crude oil flushing system (300) connected in a closed loop, an oil tank to be cleaned, and a suction and separation system (200); A dirty oil cleaning system is provided inside the oil tank to be cleaned, and the dirty oil cleaning system includes: A jet main body (1), which is connected to the crude oil flushing system (300) through a delivery pipe (7), with flushing parts (2) distributed on its outer side and drilling parts (3) distributed on its bottom; A pressure-bearing assembly (4), which is located in the middle of the jet main body (1) and is communicatively connected to the crude oil flushing system (300); A pressure detection unit is provided on the pressure-bearing assembly (4), and the pressure detection unit judges the hardness of the sediment layer at the bottom of the oil tank to be cleaned, so that a switching member adjusts the working states of the flushing part (2) and the drilling part (3) in real time, and cooperates with the crude oil flushing system (300) to realize hierarchical regulation of the flushing pressure; The switching member includes: A first switching part (5), which is located inside the jet main body (1). When it is in the first position, the flushing part (2) is in a partially open state; when it is in the second position, the flushing part (2) is in a fully closed state; A second switching part (6), which is located at the bottom of the jet main body (1). When it is in the first position, the drilling part (3) is in a partially open state; when it is in the second position, the drilling part (3) is in a fully open state.

2. The oil tank flushing device according to claim 1, characterized in that: The pressure-bearing assembly (4) includes: A pressure-receiving part, which is located at the bottom of the jet main body (1); A pushing part, which is located inside the jet main body (1) and is provided with a pressure detection unit thereon; Before the jet main body (1) reaches 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 change of the pressure detection unit and the feeding amount of the delivery pipe (7), and the crude oil pressure supplied by the crude oil flushing system (300) to the jet main body (1) is adjusted in real time according to the obtained information.

3. The oil tank flushing device according to claim 2, characterized in that: 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 main 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 main body (1) is in a second-level high-pressure state.

4. The oil tank flushing device according to claim 3, characterized in that: The first switching part (5) includes: A first interval (501) and a second interval (502). When the first switching part (5) is in the first position, the first interval (501) partially blocks the flushing part (2) on the jet main body (1); when the first switching part (5) is in the second position, the second interval (502) completely blocks the flushing part (2) on the jet main body (1).

5. The oil tank flushing device according to claim 3, characterized in that: The second switching part (6) includes: A blocking member (601), which is distributed at the bottom of the jet main body (1) and is used to block the drilling part (3); An elastic part (602), which is distributed between the jet main body (1) and the blocking member (601). When it is in a contracted state, the blocking member (601) releases the block on the drilling part (3).

6. The oil tank flushing device according to claim 5, wherein: The pressure-receiving part includes: A sliding block (405), which is located at the bottom of the jet main body (1) and is slidably connected to the jet main body (1); The wedge-shaped part (406) is located outside the sliding block (405) and contacts the blocking member (601).

7. The oil tank flushing device according to claim 5, characterized in that: The pushing part includes: A bracket (401) provided with a telescopic member (404) connected to the first switching part (5) on its circumferential side; A hydraulic part (402) is arranged on the top of the sliding block (405), and its top is connected to the telescopic member (404) through a connecting pipe (403), and the telescopic member (404) is connected to the first switching part (5).

8. The oil tank flushing device according to claim 1, characterized in that: The crude oil flushing system (300) includes 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 communicated with 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).

9. The oil tank flushing device according to claim 8, wherein: 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 a filter (2002), and the filter (2002) filters the dirty oil. The filtered dirty oil is passed into a suction tank (2003), and then the sludge is passed into an oil-water separation tank (2005) through a recovery pump (2004) for oil-water separation. The separated clean oil is sent to a recovery oil tank by an oil skimming recovery pump (2006).

10. The oil tank flushing device according to claim 9, characterized in that: A first check valve is provided between the cleaning pump (3001) and the oil supply tank. When the first check valve is in the open state, the cleaning pump (3001) sucks the flushing oil inside the oil supply tank; A second check valve is provided between the oil-water separation tank (2005) and the cleaning pump (3001). When the second check valve is in the open state, the cleaning pump (3001) sucks the clear water separated from the oil-water separation tank (2005).

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