Cleaning device with steam preheating function for low-temperature oil tank

Abstract

The utility model relates to a cleaning device for oil tank, especially to a cleaning device for low temperature oil tank with steam preheating function, the utility model provides a cleaning device for low temperature oil tank with steam preheating function, include: cleaning device and high temperature cleaning device, the beginning of cleaning device is connected with cleaning medium storage device through the conveying pipeline, the end of cleaning device is located in the cavity of oil tank, the end of high temperature cleaning device is connected with the cavity of oil tank through high temperature channel, the upper portion of oil tank still is provided with reflux pipeline, the beginning of reflux pipeline extends to the bottom in oil tank after penetrating through the lateral wall of oil tank, the end of reflux pipeline is connected with waste liquid treatment device. In view of this, the utility model provides a cleaning device for low temperature oil tank with steam preheating function, the purpose is to provide a kind of high efficiency, environmental protection's cleaning device for low temperature oil tank with steam preheating function.

Description

Technical Field

[0001] This utility model relates to a cleaning device for oil tanks, and more particularly to a cleaning device for low-temperature oil tanks with a steam preheating function. Background Technology

[0002] Cryogenic oil tanks are key equipment for storing cryogenic media in industries such as petroleum and chemical manufacturing. The cleanliness of their inner walls directly affects the quality of the stored media and the safety of equipment operation. However, in cryogenic environments, residual oil on the inner walls of oil tanks easily solidifies and adheres due to the low temperature, forming a stubborn oil layer. Traditional cleaning methods have the following shortcomings: First, the cleaning medium at room temperature has poor fluidity in cryogenic environments, making it difficult to effectively penetrate the oil stains; second, there is a lack of targeted preheating, resulting in low oil dissolution efficiency and increased cleaning time and energy consumption; third, direct discharge or simple treatment of cleaning wastewater easily leads to environmental pollution and resource waste. Utility Model Content

[0003] In view of this, the present invention provides a cleaning device for cryogenic oil tanks with steam preheating function; the purpose is to provide a high-efficiency and environmentally friendly cleaning device for cryogenic oil tanks with steam preheating function.

[0004] This utility model provides a cleaning device for low-temperature oil tanks with steam preheating function, comprising: a cleaning device and a high-temperature cleaning device. The starting end of the cleaning device is connected to a cleaning medium storage device through a conveying pipeline, and the ending end of the cleaning device is disposed in the cavity of the oil tank. The ending end of the high-temperature cleaning device is connected to the cavity of the oil tank through a high-temperature channel. A return pipeline is also provided at the upper part of the oil tank. The starting end of the return pipeline passes through the side wall of the oil tank and extends to the bottom of the oil tank. The ending end of the return pipeline is connected to a waste liquid treatment device.

[0005] Furthermore, the cleaning device includes a cleaning execution component and a cleaning medium conveying device. The cleaning execution component is disposed in the cavity of the oil tank, and the cleaning execution component is connected to the cleaning medium storage device through the conveying pipeline. The cleaning medium conveying device is disposed on the conveying pipeline.

[0006] Furthermore, the cleaning execution component includes multiple spray needles, nozzles, and cleaning rods. The multiple spray needles and nozzles are all disposed in contact with the inner wall of the oil tank. The cleaning rod is disposed through the top wall of the oil tank, and the multiple spray needles, nozzles, and cleaning rods are all connected in sequence to the cleaning medium conveying device and the cleaning medium storage device through the conveying pipeline.

[0007] Furthermore, at least one pressurizing device is also provided on the delivery pipeline.

[0008] Furthermore, it also includes a high-pressure buffer device, which is located at the output end of the pressurizing device and is connected to the cleaning device through the delivery pipeline.

[0009] Furthermore, it also includes a branch heating assembly, which is disposed on the delivery pipeline.

[0010] Furthermore, the high-temperature cleaning device includes an input pipe, a steam generator, and an output pipe. The steam generator includes a shell, inside which a tank is installed. The bottom of the tank is connected to the end of an electrically heated steam generator, and the beginning of the electrically heated steam generator is connected to the input pipe. A water level control device is installed on the input pipe. A safety device and the output pipe are sequentially installed on the top of the tank. The output pipe is connected to the high-temperature channel, and a heating device is arranged around the outer periphery of the tank.

[0011] Furthermore, it also includes a vapor-water separation device, which is disposed on one side of the outer casing, and both the input and output ends of the vapor-water separation device are connected to the high-temperature cleaning device.

[0012] Furthermore, the waste liquid treatment device includes an oil-water separation device. The input end of the oil-water separation device is connected to the return pipeline, and the output end of the oil-water separation device is connected to a filter device and an oil-water tank, respectively. The upper part of the filter device is connected to the top of the oil storage tank, and the lower part of the filter device is connected to the top of the oil-water tank. A pressure safety device is installed on the top of the oil storage tank.

[0013] Furthermore, it also includes a control device, which is electrically connected to both the cleaning device and the high-temperature cleaning device.

[0014] The beneficial effects of this utility model are as follows: 1. This utility model employs a combination of steam preheating and high-pressure cleaning. High-temperature steam generated by a high-temperature cleaning device preheats the inner wall of the oil tank, softening solidified oil and reducing its viscosity through the thermal effect of the steam, thus creating conditions for subsequent high-pressure cleaning. Subsequently, the pressurized and heated cleaning medium impacts the oil through the cleaning device, achieving a synergistic effect of "preheating-stripping," effectively solving the problem of difficult-to-remove solidified oil in low-temperature environments. During cleaning, the oil in the tank is first emptied. Then, the high-temperature cleaning device is activated via a control device, generating high-temperature steam and delivering it into the tank. The thermal effect of the steam assists in dissolving stubborn oil, improving subsequent cleaning efficiency. After a preset time of high-temperature steam action, the cleaning device is activated, pressurizing and heating the cleaning medium through a cleaning medium delivery device, branch heating pipes, and a pressurizing device, and then delivering it through the delivery pipe. The oil is transported to the cleaning execution assembly. During cleaning, the spray needles and nozzles in the cleaning execution assembly simultaneously spray high-pressure media from the top and sides of the oil tank, creating a three-dimensional impact. At the same time, the cleaning rod performs a rotating spraying action to ensure that the high-pressure media covers all areas of the inner wall of the oil tank, directly stripping or rinsing away residual oil. The waste liquid after cleaning is discharged from the oil tank through the return pipeline and transported to the waste liquid treatment device. The oil-water vacuum pump in the waste liquid treatment device provides negative pressure to accelerate the process of waste liquid transportation and separation. After entering the filtration device, the waste liquid is separated through "oil-water physical stratification"—the less dense oil floats to the top and is transported to the oil storage tank through the pipeline, while the separated water is transported to the oil-water tank, ultimately achieving the resource recovery or compliant discharge of the waste liquid. This improves the cleaning efficiency of this utility model, and the treatment of waste liquid before recycling or discharge is more environmentally friendly.

[0015] 2. This utility model forms a closed-loop conveying path by connecting the cleaning execution component, the cleaning medium conveying device, and the storage device in series. Combined with the stable pumping capability of the cleaning medium conveying device, it ensures that the cleaning medium can be continuously and evenly supplied during the cleaning process. During operation, the cleaning medium is preheated by the branch heating component before entering the cleaning execution component, avoiding the problem of reduced cleaning efficiency due to interruption of medium supply and the problem of oil solidification due to excessively low temperature of the cleaning medium, which would affect the cleaning effect. This significantly improves the continuous operation capability and reliability of this utility model.

[0016] 3. This utility model uses a pressurizing device to increase the pressure of the cleaning medium, which, together with the spray needle and nozzle, forms a high-speed jet three-dimensional impact that directly impacts the stubborn oil stains softened on the inner wall of the oil tank. At the same time, the cleaning rod performs a rotating spraying action to ensure that the high-pressure medium covers all areas of the inner wall of the oil tank, washing away residual oil stains and then peeling them off or directly peeling them off, making the cleaning efficiency of this utility model more efficient.

[0017] 4. This utility model uses a combination design of multiple spray needles and nozzles attached to the inner wall and a rotating cleaning rod to spray, forming an overall coverage from top to side to bottom during operation: the top spray needles cover the curved area of ​​the tank top, the side nozzles are vertically distributed along the tank wall, and the rotating cleaning rod sprays to relatively completely cover the tank wall and bottom, achieving cleaning of all areas of the inner wall of the oil tank. It is especially suitable for areas with oil accumulation such as weld seams and corners, making the cleaning efficiency of this utility model more efficient.

[0018] 5. This utility model, by setting a high-pressure buffer device at the output end of the pressurizing device, absorbs pressure fluctuations generated during the pressurization process through its own structural design. During operation, when the instantaneous peak value of the output pressure of the pressurizing device exceeds the set value, the high-pressure buffer device will absorb the impact energy, avoiding damage to the welding points of the conveying pipeline and the seals of the cleaning components by the high-pressure pulse, effectively extending the mean time between failures of the equipment, reducing the maintenance cost of this utility model, and improving the practicality of this utility model.

[0019] 6. This utility model uses a segmented heating component to heat the cleaning medium in a targeted manner. The heated cleaning medium can quickly dissolve oil stains with high viscosity at low temperatures. Combined with high-pressure jet, it achieves the technical effects of thermal dissolution and mechanical peeling. Compared with cleaning at room temperature, the efficiency of this utility model is significantly improved. At the same time, it can relatively reduce the amount of cleaning medium used, reduce the generation of waste liquid and the amount of hazardous waste treatment, making it more environmentally friendly.

[0020] 7. This utility model uses a steam generator and a water level control device to stably generate saturated steam. The steam diffuses evenly into the oil tank through a high-temperature channel, and the temperature of the inner wall of the oil tank is raised evenly through heat conduction, which softens the solidified oil stains and provides pretreatment for subsequent high-pressure cleaning, improving the oil stain removal efficiency and making the cleaning efficiency of this utility model more efficient.

[0021] 8. This utility model can remove 99% of the liquid water in steam through a steam-water separation device. After the dry steam enters the oil tank, it avoids the formation of emulsion due to the dilution of oil by condensate, thus reducing secondary pollution. At the same time, the enthalpy value of the dry steam will be increased, which indirectly improves the heat utilization efficiency, thereby shortening the oil tank preheating time and reducing the oil tank cleaning time, thus improving the practicality of this utility model.

[0022] 9. When this utility model is working, it generates negative pressure through an oil-water vacuum pump, which accelerates the speed at which the cleaning waste liquid enters the filtration device. After separation by the filtration device, the oil is recovered, and the separated water can be recycled to the cleaning medium storage device or directly discharged, realizing the reuse of water resources. At the same time, it reduces the environmental protection treatment cost and the amount of hazardous waste treatment compared with the traditional direct discharge method, making it more environmentally friendly. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a side sectional view of the oil tank and cleaning actuator of this utility model; Figure 3 This is a schematic diagram of the overall structure of the steam generator of this utility model.

[0024] Reference numerals: 1. Delivery pipeline, 2. Cleaning medium storage device, 3. Oil tank, 4. High-temperature channel, 5. Return pipeline, 6. Spray needle, 7. Pressurizing device, 8. Nozzle, 9. Cleaning rod, 10. High-pressure buffer device, 11. Branch heating assembly, 12. Outer shell, 13. Tank body, 14. Electric heating steam generator, 15. Input pipeline, 16. Water level control device, 17. Output pipeline, 18. Oil-water separator, 19. Filter device, 20. Oil-water wastewater tank, 21. Oil storage tank, 22. Control device, 23. Supply pipeline, 24. Safety component of oil-water wastewater tank, 25. Vacuum valve, 26. Safety valve, 27. Pressure gauge, 28. Steam-water separator, 29. Cyclone water separation steam assembly, 30. Electric heating tube. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figure 1As shown, this utility model provides a cleaning device for a low-temperature oil tank 3 with steam preheating function. It is characterized by comprising: a cleaning device and a high-temperature cleaning device. The beginning of the cleaning device is connected to a cleaning medium storage device 2 via a conveying pipeline 1, and the end of the cleaning device is located inside the cavity of the oil tank 3. The end of the high-temperature cleaning device is connected to the cavity of the oil tank 3 via a high-temperature channel 4. A return pipeline 5 is also provided at the upper part of the oil tank 3. The beginning of the return pipeline 5 penetrates the side wall of the oil tank 3 and extends to the bottom inside the oil tank 3. The end of the return pipeline 5 is connected to a waste liquid treatment device. Preferably, sensors are added to the oil tank 3, each pipeline, and component (the type and number of sensors can be selected according to actual usage requirements), such as adding a PT100 sensor (for real-time monitoring of the temperature at the branch heating and flow regulation points). Both the cleaning device and the high-temperature cleaning device are connected to a control device 22 (such as a PLC). The control cabinet is electrically connected, and the sensor feeds back real-time data to the control device 22 to achieve precise control of the temperature (preferably 50-80℃) and steam pressure (preferably 0.8-1.2MPa) of the cleaning medium. The control device 22 is not a structure that is the main protected structure in this application. It is only used to reduce the number of operation steps, summarize relevant data and control the operation of each component. All existing control systems or devices that can achieve the above technical objectives can be used.

[0029] like Figure 1 , Figure 2 As shown, the cleaning device includes a cleaning execution component and a cleaning medium delivery device. The cleaning execution component is located inside the cavity of the oil tank 3, and is connected to the cleaning medium storage device 2 via the delivery pipeline 1. The location of the cleaning medium storage device 2 is not limited and can be selected according to the actual situation (the figure shows it is located underground and continuously supplied with cleaning medium through the supply pipeline 23). The stored cleaning medium can be water or a special oil stain cleaning solution. The cleaning medium delivery device is located on the delivery pipeline 1. The cleaning medium delivery device can also be the pressurization device 7 mentioned below, as long as the water or liquid source is sufficient.

[0030] like Figure 1 As shown, at least one pressurizing device 7 (such as a high-pressure pump, preferably with a working pressure adjustment range of 15-20MPa and a rated flow of 80-120L / min, preferably a device used in conjunction with the high-pressure buffer device 10) is also provided on the delivery pipeline 1, for example, the HDI series stationary high-flow high-pressure pump set manufactured by Karcher in Germany.

[0031] like Figure 2As shown, the cleaning execution component includes multiple spray needles 6 (preferably silicon carbide spray needles), nozzles 8, and cleaning rods 9. The multiple spray needles 6 and nozzles 8 are all set to fit against the inner wall of the oil tank 3 (preferably, multiple sets of spray needles 6 and nozzles 8 are evenly distributed on the top and sides of the inner wall of the oil tank 3; the figure only shows the position, and multiple sets can be set in actual use), and the multiple spray needles 6 and nozzles 8 are preferably arranged in series. The cleaning rod 9 is set through the top wall of the oil tank 3. The cleaning rod 9 is preferably movable (such as rotatable or telescopic) to ensure that the high-pressure medium can cover all areas of the inner wall of the oil tank 3 (including corners, welds, etc.) for directly peeling off or rinsing residual oil stains. The multiple spray needles 6, nozzles 8, and cleaning rods 9 are all connected to the cleaning medium conveying device and the cleaning medium storage device 2 in sequence through the conveying pipeline 1.

[0032] like Figure 1 As shown, it also includes a high-pressure buffer device 10, which is located at the output end of the pressurizing device 7 and is connected to the pressurizing device 7 through the delivery pipeline 1. The function of the high-pressure buffer device 10 is only to stabilize the pressure and prevent the pressure fluctuation of the pump from affecting the cleaning effect. There are no special requirements, and conventional settings can be used (such as using a nitrogen diaphragm structure, preferably with a volume of 5-10L, which can absorb pressure fluctuations of ±0.5MPa to protect downstream pipelines and cleaning components from water hammer impact).

[0033] like Figure 1 As shown, it also includes a branch heating assembly 11, which is installed on the delivery pipeline 1 (only one installation position is shown in the figure; the connection method for other parts is the same, and the installation can be selected according to actual usage requirements). The branch heating assembly 11 includes a heating device, a temperature sensing device, and a temperature control system, etc. It is preferred to heat the cleaning medium in sections to 50-80℃ (recommended temperature range, which can be adjusted according to actual usage). It is recommended to control the temperature difference within ±2℃ to meet the oil stain dissolution requirements in low-temperature environments. The heating device is designed to heat the passing cleaning medium to improve the cleaning effect. It is preferred to use an electric heating tube 30 (such as a branch heating tube), for example, a segmented heating stainless steel square finned heating tube produced by Yancheng Yuheng Electric Heating Technology Co., Ltd. The temperature sensing device can be any suitable temperature sensor (such as a branch heating sensor, flow regulation sensor, branch heating tube temperature sensor, etc., selected according to actual usage requirements), for example, the BLX-WD-I PT100 produced by Qingdao Bailixin Automation Instrument Co., Ltd. Temperature sensor; The above temperature control system is the control center of the existing branch heating. It can accurately control the power of the heating tube through any algorithm to achieve stable adjustment of the branch heating temperature. For example, it can be equipped with the CH402 and RH400 series temperature controllers from RKC Corporation of Japan.

[0034] like Figure 1 , Figure 3As shown, the high-temperature cleaning device includes an input pipe 15, a steam generator, and an output pipe 17. The steam generator includes a housing 12 with a side-opening door. A tank 13 is fitted inside the housing 12. The bottom of the tank 13 is connected to the end of an electrically heated steam generator 14 (such as an electric steam generator, preferably with a power of 360-1080KW). The beginning of the electrically heated steam generator 14 is connected to the input pipe 15. A water level control device 16 (such as an electrode-type explosion-proof device, preferably with a control accuracy of ±5mm) is installed on the input pipe 15. The electrically heated steam generator 14 includes an electrically heated steam generator (including an electrode-type anti-steam structure) and an electric steam generator. The electrically heated steam generator (including an electrode-type anti-steam structure) is connected to an electrically heated tube 30. Alternatively, the electrodes can directly heat water, converting it into steam; the "electrode-type anti-steam" structure prevents reverse steam interference, ensuring heating stability; the aforementioned electric steam generator is an additional electric heating unit, supplementing heat and further increasing steam output or temperature to meet high load demands; the top of the tank 13 is sequentially equipped with a safety device and an output pipe 17, which is connected to the high-temperature channel 4, and can stably generate saturated steam with a predetermined value of 0.8-1.2MPa, which is then transported to the cavity of the oil tank 3 through the high-temperature channel 4; the outer periphery of the tank 13 is surrounded by a heating device (preferably an electric heating tube 30 or an electrode) to form a double-layer heating structure; the aforementioned tank 13 is preferably made of 316L stainless steel corrosion-resistant material, such as the high-temperature resistant and highly corrosion-resistant Inconel 600 (nickel-based alloy); the aforementioned electric steam generator... The hot steam generator and the electric steam generator can be any existing electric heating steam generator and electric steam generator that can meet the industrial requirements of high temperature, high pressure and corrosion resistance. For example, the 360KW stainless steel electric steam generator or the 1080kw large electric heating steam generator produced by Guangzhou Best Thermal Energy Technology Co., Ltd., or the customized electric steam generator module (such as the 50KW power segment) produced by Guangzhou Newman Thermal Energy Equipment Manufacturing Co., Ltd. The above-mentioned electric heating tube 30 and the electrode can be any device that can meet the requirements of high temperature resistance, corrosion resistance and power stability. For example, the 316L stainless steel flange heating tube (HB-FL-316L) produced by Yancheng Huabang Electric Heating Technology Co., Ltd., or the nickel alloy electrode rod (SW-EL-Ni60) produced by Shanghai Siweier Electric Heating Equipment Co., Ltd.

[0035] like Figure 3As shown, it also includes a steam-water separation device (preferably a cyclone separator and wire mesh precipitator structure). The steam-water separation device is located on one side of the outer shell 12, and both the input and output ends of the steam-water separation device are connected to the high-temperature cleaning device. The separated dry steam is transported outward through the output pipe 17 connected to the tank 13, while the separated water flows back into the cavity of the tank 13. The steam-water separation device can separate the water droplets entrained in the steam (removing 99% of the liquid water in the steam), ensuring that the steam dryness is ≥95%, avoiding secondary pollution caused by water diluting oil stains, and increasing the heat utilization efficiency to 15%. The steam-water separator 28 can be any type of steam-water separation device that meets the industrial requirements of high-efficiency separation, corrosion resistance, and high pressure resistance. Common types include cyclone steam-water separators and cyclone steam separators (shown in the figure is a cyclone steam-water separator). For example, the MQF series cyclone steam-water separator 28 (DN32-DN200) produced by Xinxiang Mait Filtration Equipment Co., Ltd. or the DC7 Cyclonic Steam produced by TLV of Japan can be used. Separator high-efficiency cyclone steam separator.

[0036] like Figure 1 As shown, the wastewater treatment device includes an oil-water separator 18 (such as an oil-water separation vacuum pump). The input end of the oil-water separator 18 is connected to the return pipeline 5, and the output end of the oil-water separator 18 is connected to a filter device 19 and an oil-water tank 20, respectively. The upper part of the filter device 19 is connected to the top of the oil storage tank, and the lower part of the filter device 19 is connected to the top of the oil-water tank 20. In an ideal environment, the filtration effect of the filter device 19 can achieve the goal of oil recovery rate of cleaning wastewater ≥85%, and the separated water resources can be directly recycled. The top of the oil storage tank 21 is also equipped with a pressure safety device, which includes a vacuum valve 25, a safety valve 26, and a pressure gauge 27. When the pressure in the oil storage tank 21 exceeds the limit, it can automatically release pressure to protect the safety of the tank body 13. Similarly, the oil and wastewater tank 20 is equipped with an oil and wastewater tank safety component 24, a safety valve 26, and a pressure gauge 27 to prevent overpressure and leakage in the oil and wastewater tank 20. The vacuum valve 25, safety valve 26, and pressure gauge 27 have no special requirements and any suitable one can be selected from the market.

[0037] For other devices not specifically marked in this application, any applicable model in the prior art that does not have special specifications may be used, and the choice of specific model will not affect the implementation of this application.

[0038] The materials of the above components will be selected according to the actual use to ensure performance and stability. For different use environments (such as high temperature and humid conditions), it is recommended to prioritize the selection of components with corresponding weather-resistant materials. For details, please refer to the "Environmental Adaptability Parameter Table" in this manual. The above components should be cleaned, repaired, maintained and replaced in a timely manner in a combination of regular and irregular methods according to the actual usage frequency, operating conditions and other factors to ensure that they are always in good operating condition.

[0039] The specific working principle is as follows: During cleaning, the oil in the tank is first emptied. Then, the high-temperature cleaning device is activated through the control device to generate high-temperature steam and deliver it into the tank. The steam thermal effect helps to dissolve stubborn oil stains and improves the efficiency of subsequent cleaning. After the high-temperature steam has acted for a preset time, the cleaning device is activated. The cleaning medium is pressurized and heated through the cleaning medium delivery device, branch heating pipes and pressurization device, and then delivered to the cleaning execution component through the delivery pipeline. During cleaning, the spray needles and nozzles in the cleaning execution component simultaneously spray high-pressure media from the top and sides of the oil tank, forming a three-dimensional impact. At the same time, the cleaning rod performs a rotating spraying action to ensure that the high-pressure media covers all areas of the inner wall of the oil tank (including corners, welds, etc.), directly peeling off or washing away residual oil stains. After cleaning, the waste liquid is discharged from the oil tank through a return pipeline and transported to the waste liquid treatment device. The oil-water vacuum pump in the waste liquid treatment device provides negative pressure to accelerate the process of waste liquid transportation and separation. After entering the filtration device, the waste liquid is separated through "oil-water physical stratification" - the less dense oil floats to the top and is transported through pipeline to the oil storage tank (the tank pressure is kept safe by a safety valve). The separated water is transported to the oil-water tank (the oil-water tank is kept stable by a safety device), and finally the waste liquid is recycled or discharged in compliance with standards.

[0040] Specific workflow: 1. Preheating stage: After emptying the oil tank, start the steam generator to generate high-temperature steam, which is dried by the steam-water separator (preferably with a dryness of ≥95%) and then enters the oil tank. It is preferred to raise the temperature of the inner wall of the oil tank to above 60°C within 15 minutes in order to soften the solidified oil. 2. High-pressure cleaning stage: The branch heating component heats the cleaning medium to 50-80℃ (the above temperature is a recommended temperature and can be adjusted according to actual use), and the pressurization device increases the cleaning medium to 15-20MPa pressure. The medium is sprayed in three dimensions through silicon carbide nozzles (preferably ≥80m / s jet) and rotating cleaning rods, covering the top, sides and corner areas of the oil tank. 3. Wastewater Treatment Stage: The cleaning wastewater enters the oil-water separator via the return pipeline, and is treated at -0.06MPa. (Recommended negative pressure value) Oil and water are separated under negative pressure, which improves the oil recovery rate. The separated water can be recycled after filtration, or it can be discharged directly after meeting the discharge standards, so as to reduce the amount of hazardous waste treatment.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cleaning device for cryogenic oil tanks with steam preheating function, characterized in that, include: The system includes a cleaning device and a high-temperature cleaning device. The beginning of the cleaning device is connected to a cleaning medium storage device via a delivery pipeline, and the end of the cleaning device is located inside the cavity of the oil tank. The end of the high-temperature cleaning device is connected to the cavity of the oil tank via a high-temperature channel. A return pipeline is also provided at the top of the oil tank. The beginning of the return pipeline passes through the side wall of the oil tank and extends to the bottom of the oil tank. The end of the return pipeline is connected to a waste liquid treatment device.

2. The cleaning device for cryogenic oil tanks with steam preheating function according to claim 1, characterized in that: The cleaning device includes a cleaning execution component and a cleaning medium conveying device. The cleaning execution component is disposed in the cavity of the oil tank and is connected to the cleaning medium storage device through the conveying pipeline. The cleaning medium conveying device is disposed on the conveying pipeline.

3. A cleaning device for low-temperature oil tanks with steam preheating function according to claim 2, characterized in that: The cleaning execution component includes multiple spray needles, nozzles, and cleaning rods. The multiple spray needles and nozzles are all disposed in contact with the inner wall of the oil tank. The cleaning rod is disposed through the top wall of the oil tank, and the multiple spray needles, nozzles, and cleaning rods are all connected in sequence to the cleaning medium conveying device and the cleaning medium storage device through the conveying pipeline.

4. A cleaning device for cryogenic oil tanks with steam preheating function according to claim 1, characterized in that: At least one pressurizing device is also installed on the delivery pipeline.

5. A cleaning device for cryogenic oil tanks with steam preheating function according to claim 4, characterized in that: It also includes a high-pressure buffer device, which is located at the output end of the pressurizing device and is connected to the cleaning device through the delivery pipeline.

6. A cleaning device for cryogenic oil tanks with steam preheating function according to claim 1, characterized in that: It also includes a branch heating assembly, which is disposed on the delivery pipeline.

7. A cleaning device for cryogenic oil tanks with steam preheating function according to claim 1, characterized in that: The high-temperature cleaning device includes an input pipe, a steam generator, and an output pipe. The steam generator includes a shell, inside which a tank is installed. The bottom of the tank is connected to the end of an electrically heated steam generator, and the beginning of the electrically heated steam generator is connected to the input pipe. A water level control device is installed on the input pipe. A safety device and the output pipe are sequentially installed on the top of the tank. The output pipe is connected to the high-temperature channel. A heating device is arranged around the outer periphery of the tank.

8. A cleaning device for cryogenic oil tanks with steam preheating function according to claim 7, characterized in that: It also includes a steam-water separation device, which is located on one side of the outer casing, and both the input and output ends of the steam-water separation device are connected to the high-temperature cleaning device.

9. A cleaning device for cryogenic oil tanks with steam preheating function according to claim 1, characterized in that: The waste liquid treatment device includes an oil-water separator. The input end of the oil-water separator is connected to the return pipeline. The output end of the oil-water separator is connected to a filter and an oil-water tank, respectively. The upper part of the filter is connected to the top of the oil storage tank, and the lower part of the filter is connected to the top of the oil-water tank. A pressure safety device is installed on the top of the oil storage tank.

10. A cleaning device for cryogenic oil tanks with steam preheating function according to claim 1, characterized in that: It also includes a control device, which is electrically connected to both the cleaning device and the high-temperature cleaning device.

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