Oil tank cleaning device and oil tank cleaning method

Abstract

The invention discloses an oil tank cleaning device and an oil tank cleaning method.The oil tank cleaning device comprises a storage tank, a power tank, a heater, an oil return tank, an oil-water separation device, a heat exchanger and a dirty oil cutting system which are sequentially communicated and form a closed loop; the oil stain cutting system comprises a hollow drill rod communicated with the heat exchanger, a drill rod driving system used for driving the drill rod and a cutter arranged at the end of the drill rod, the cutter comprises a conveying pipe communicated with the drill rod, a drill bit arranged at the end of the conveying pipe, a cutting nozzle and a punching nozzle, and the cutting nozzle and the punching nozzle are arranged on the conveying pipe and communicated with the conveying pipe. A conversion valve and a sliding valve are arranged at the position, communicated with the cutting nozzle and the punching nozzle, in the conveying pipe. The liquid phase in the solid phase in the storage tank is separated, the oil tank is cleaned, external homogeneous oil does not need to be introduced, the storage tank is cleaned to reach the standard, oil, water and solid three-phase separation is achieved, and the purposes of improving the cleaning efficiency and reducing the cleaning cost are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical tank cleaning, and in particular to an oil tank cleaning device and an oil tank cleaning method. Background Art

[0002] The traditional mechanical tank cleaning technology uses the principle of spraying. The spray cleaning machine is connected to the cleaning oil tank and the bypass oil tank through a pipeline to form a circulation system. Before the cleaning operation, nitrogen is injected into the cleaning tank to control the oxygen concentration in the tank below 8% to form a safe working environment. The spray oil of the cleaning machine is supplied by the oil supply tank, and the sediment in the tank and the surface of the tank top, tank wall, and tank bottom are sprayed, so that the sediment diffuses, dissolves and forms a new mixture with the supply oil. The mixture is transferred to the bypass tank by the suction system, and the wax deposits in the tank are processed after repeated circulation for a certain period of time. The traditional mechanical tank cleaning technology is essentially to clean the oil tank by adding some homogeneous oil, and the dirty oil after cleaning is transferred to other storage tanks. During the cleaning process, homogeneous oil needs to be added to dissolve the residual solid phase in the tank body, which not only reduces the cleaning efficiency, but also increases the cleaning cost.

[0003] In order to solve the above problems, the present invention provides an oil tank cleaning device and an oil tank cleaning method to solve the problems of low cleaning efficiency and high cleaning cost of conventional mechanical tank cleaning. Summary of the invention

[0004] In order to solve the above problems, the present invention provides an oil tank cleaning device and an oil tank cleaning method, which realize the three-phase separation of oil, water and solid, and achieve the purpose of enhancing cleaning efficiency and reducing cleaning costs.

[0005] To achieve the above object, the present invention provides the following solutions: An oil tank cleaning device comprises a storage tank, a power tank, a heater, an oil return tank, an oil-water separation device, a heat exchanger and a dirty oil cutting system which are connected in sequence to form a closed loop, the storage tank is connected to an inert gas generator, the dirty oil cutting system comprises a hollow drill rod connected to the heat exchanger, a drill rod driving system for driving the drill rod and a cutter arranged at the end of the drill rod, the cutter comprises a delivery pipe connected to the drill rod, a drill bit arranged at the end of the delivery pipe, and a cutting nozzle and a punching nozzle arranged on the delivery pipe and connected to the delivery pipe, and a steering valve and a sliding valve are arranged at the connection point between the delivery pipe and the cutting nozzle and the punching nozzle.

[0006] Preferably, a connecting flange is provided at one end of the delivery pipe communicating with the drill pipe.

[0007] Preferably, at least two filters are arranged in parallel between the storage tank and the heater, and the filters are also connected to the power tank.

[0008] Preferably, a feed pump is provided between the filter and the heater.

[0009] Preferably, a solid-liquid separator and an oil-water separator are sequentially arranged between the heater and the oil return tank.

[0010] Preferably, a pressure pump is provided between the oil-water separation device and the heater.

[0011] Preferably, the booster pump is also connected to the power tank and the oil return tank respectively.

[0012] Preferably, a manhole is provided on the storage tank.

[0013] A method for cleaning an oil tank comprises the following steps: Injecting nitrogen into the storage tank to make the oxygen concentration in the storage tank below 8%; Start the power tank. The power tank relies on the vacuum system to introduce the dirty oil in the storage tank into the heater. The raw materials are heated to 60-80℃ to increase their fluidity and then enter the solid-liquid separator for separation. The water content of the solid phase after separation by the solid-liquid separator is less than 75%. The liquid phase enters the oil-water separator for oil-water separation. The separated oil phase enters the oil return tank. The oil content of the sewage is less than 200mg / L and is sent out. The oil phase entering the oil return tank is pressurized by a high-pressure pump, heated by a heat exchanger, and then enters the dirty oil cutting system; The waste oil cutting system cuts, crushes, and dissolves the solid waste oil at the bottom of the tank to form fluidity, and then passes through the power tank and enters the system for separation.

[0014] Preferably, when the liquid phase in the return oil tank can meet the system cleaning needs, the qualified oil produced by the oil-water separator is sent out; when the fluidity of the liquid phase at the bottom of the tank is good, the liquid phase at the bottom of the tank can also be directly introduced into the return oil tank through the power tank, and enter the cutting system through the pressure pump for operation; when the liquid phase at the bottom of the tank contains more water, the liquid phase in the return oil tank can enter the oil-water separation device through the pressure pump to achieve secondary separation of oil and water.

[0015] Compared with the prior art, the present invention has achieved the following technical effects: The present invention utilizes the liquid phase in the solid phase of the separation tank to clean the oil tank without the need to introduce external homogeneous oil. The tank is cleaned to meet the standards and the three-phase separation of oil, water and solid is achieved, thereby achieving the purpose of enhancing cleaning efficiency and reducing cleaning costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Attached Figure 1 It is a structural schematic diagram of the present invention; Attached Figure 2 It is a schematic diagram of the structure of the cutter of the present invention; Among them, 1. Storage tank; 2. Cutter; 3. Manhole; 4. Drill rod; 5. Dirty oil cutting system; 6. Inert gas generator; 7. Drilling rig drive system; 8. Filter; 9. Feed pump; 10. Heater; 11. Solid-liquid separator; 12. Oil-water separator; 13. Pressure pump; 14. Heat exchanger; 15. Cutting nozzle; 16. Sliding valve; 17. Reversing valve; 18. Punching nozzle; 19. Delivery pipe; 20. Connecting flange; 21. Return oil tank; 22. Power tank; 23. Oil-water separation device. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0019] The present invention provides an oil tank cleaning device and an oil tank cleaning method, which realize the three-phase separation of oil, water and solid, and achieve the purpose of enhancing the cleaning efficiency and reducing the cleaning cost.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] refer to Figures 1 to 2, an oil tank cleaning device, comprising a storage tank, a power tank, a heater, an oil return tank, an oil-water separation device, a heat exchanger and a dirty oil cutting system which are connected in sequence and form a closed loop, the storage tank is connected to an inert gas generator, the dirty oil cutting system comprises a hollow drill rod connected to the heat exchanger, a drill rod driving system for driving the drill rod and a cutter arranged at the end of the drill rod, the cutter comprises a delivery pipe connected to the drill rod, a drill bit arranged at the end of the delivery pipe, and a cutting nozzle and a punching nozzle arranged on the delivery pipe and connected to the delivery pipe, a steering valve and a sliding valve are arranged at the connection between the delivery pipe and the cutting nozzle and the punching nozzle; the present invention utilizes the liquid phase in the solid phase in the separation storage tank to realize the cleaning of the oil tank, does not need the introduction of external homogeneous oil, cleans the storage tank to meet the standards, and realizes the separation of oil, water and solid phases, so as to achieve the purpose of enhancing the cleaning efficiency and reducing the cleaning cost.

[0022] refer to Figure 2 A connecting flange is provided at one end of the delivery pipe connected to the drill pipe.

[0023] refer to Figure 1 At least two filters are arranged in parallel between the storage tank and the heater, and the filters are also connected to the power tank.

[0024] refer to Figure 1 A feed pump is provided between the filter and the heater.

[0025] refer to Figure 1 A solid-liquid separator and an oil-water separator are arranged in sequence between the heater and the oil return tank.

[0026] refer to Figure 1 A booster pump is provided between the oil-water separation device and the heater; the booster pump provides power, and the booster pump flow design flow is: 150m 3 / h, pressurization pressure 2.0-2.5MPa.

[0027] refer to Figure 1 The booster pump is also connected to the power tank and the oil return tank respectively.

[0028] refer to Figure 1 , a manhole is provided on the storage tank.

[0029] A method for cleaning an oil tank comprises the following steps: When a new type of oil tank cleaning device is started, nitrogen is first injected to control the oxygen concentration in the tank below 8%. Then the power tank is started. The power tank relies on a vacuum system to introduce the dirty oil in the storage tank into the raw material heater. By heating the raw material to 60-80°C, its fluidity is increased and it enters the solid-liquid separator for separation. The water content of the solid phase after separation by the solid-liquid separator is less than 75%. The liquid phase enters the oil-water separator for oil-water separation, and the separated oil phase enters the return oil tank. The wastewater oil content is less than 200mg / L and is sent out. The oil phase entering the return oil tank is pressurized by a high-pressure pump, heated by a heat exchanger, and enters the dirty oil cutting system.

[0030] The dirty oil cutting system consists of a drilling rig drive system, a drill rod, and a cutter. The drilling rig drive system drives the drill rod to rotate and drives the cutter to rotate. The cutter is the core component of the dirty oil cutting system. As shown in the figure, it consists of a connecting flange, a steering valve, a sliding valve, a drilling nozzle, and a cutting nozzle. High-pressure dirty oil enters the cutter through the drill rod. The cutter follows the rotation of the drill rod while the dirty oil deposited at the bottom of the tank is being cut. Through the action of the reversing valve and the sliding valve, the drilling nozzle is first opened, and the high-pressure oil passes through the drilling nozzle of the cutter to perform a drilling operation on the solid-phase dirty oil. After the drilling is completed, as the drill rod moves downward, the drilling nozzle is closed, and through the action of the reversing valve and the sliding valve, the cutting nozzle is opened to cut, crush, and dissolve the solid-phase dirty oil at the bottom of the tank to form fluidity. Then it passes through the power tank and enters the system for separation for the second time.

[0031] When the liquid phase of the return oil tank can meet the system cleaning needs, the qualified oil produced by the oil-water separator is sent out. When the fluidity of the liquid phase at the bottom of the tank is good, the liquid phase at the bottom of the tank can also be directly introduced into the return oil tank through the power tank, and enter the cutting system through the pressure pump for operation. When the liquid phase at the bottom of the tank contains more water, the liquid phase of the return oil tank can enter the oil-water separation device through the pressure pump to achieve secondary separation of oil and water.

[0032] Furthermore, when the cutter is operating, the punching operation is performed first, and the punching time is controlled to be 200-300s, and then the cutting operation is performed, and the single cutting time is controlled to be less than 15min.

[0033] The drill rod drives the cutter to perform sinking operations, the drill rod speed is controlled at 5-8 rpm, and the operating depth of each operation is controlled at 0.4-0.5 meters.

[0034] Further, the number of perforating nozzles of each cutter is 3, evenly distributed at an angle of 120 degrees. The number of perforating nozzles of each cutter is 4, evenly distributed at an angle of 90 degrees.

[0035] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0036] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An oil tank cleaning device, characterized in that: The invention comprises a storage tank, a power tank, a heater, an oil return tank, an oil-water separation device, a heat exchanger and a dirty oil cutting system which are connected in sequence to form a closed loop. The storage tank is connected to an inert gas generator. The dirty oil cutting system comprises a hollow drill pipe connected to the heat exchanger, a drill pipe driving system for driving the drill pipe and a cutter arranged at the end of the drill pipe. The cutter comprises a delivery pipe connected to the drill pipe, a drill bit arranged at the end of the delivery pipe, and a cutting nozzle and a punching nozzle arranged on the delivery pipe and connected to the delivery pipe. A steering valve and a sliding valve are arranged at the connection point between the delivery pipe and the cutting nozzle and the punching nozzle.

2. The oil tank cleaning device according to claim 1, characterized in that: One end of the delivery pipe communicating with the drill pipe is provided with a connecting flange.

3. The oil tank cleaning device according to claim 1, characterized in that: At least two filters are arranged in parallel between the storage tank and the heater, and the filters are also connected to the power tank.

4. The oil tank cleaning device according to claim 3, characterized in that: A feed pump is arranged between the filter and the heater.

5. The oil tank cleaning device according to claim 4, characterized in that: A solid-liquid separator and an oil-water separator are arranged in sequence between the heater and the oil return tank.

6. The oil tank cleaning device according to claim 1, characterized in that: A pressure pump is arranged between the oil-water separation device and the heater.

7. The oil tank cleaning device according to claim 6, characterized in that: The booster pump is also connected to the power tank and the oil return tank respectively.

8. The oil tank cleaning device according to claim 1, characterized in that: A manhole is arranged on the storage tank.

9. A method for cleaning an oil tank, characterized in that: The oil tank cleaning device according to any one of claims 1 to 8 comprises the following steps: Injecting nitrogen into the storage tank to make the oxygen concentration in the storage tank below 8%; Start the power tank. The power tank relies on the vacuum system to introduce the dirty oil in the storage tank into the heater. The raw materials are heated to 60-80℃ to increase their fluidity and then enter the solid-liquid separator for separation. The water content of the solid phase after separation by the solid-liquid separator is less than 75%. The liquid phase enters the oil-water separator for oil-water separation. The separated oil phase enters the oil return tank. The oil content of the sewage is less than 200mg / L and is sent out. The oil phase entering the oil return tank is pressurized by a high-pressure pump, heated by a heat exchanger, and then enters the dirty oil cutting system; The waste oil cutting system cuts, crushes, and dissolves the solid waste oil at the bottom of the tank to form fluidity, which then passes through the power tank and enters the system for separation.

10. The oil tank cleaning method according to claim 9, characterized in that: When the liquid phase of the return oil tank can meet the system cleaning needs, the qualified oil produced by the oil-water separator will be sent out; when the fluidity of the liquid phase at the bottom of the tank is good, the liquid phase at the bottom of the tank can also be directly introduced into the return oil tank through the power tank, and enter the cutting system through the pressure pump for operation; when the liquid phase at the bottom of the tank contains more water, the liquid phase of the return oil tank can enter the oil-water separation device through the pressure pump to achieve secondary separation of oil and water.

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