A method for cleaning and recovering residual fuel in a fuel tank

Abstract

The present invention relates to the technical field of residual fuel recovery in fuel tanks, and in particular to a method for cleanly recovering residual fuel in fuel tanks, comprising: obtaining a key attachment area of residual fuel on the inner wall of a fuel tank to be processed, and detecting key area features and key fuel features of the key attachment area; processing the key area features and key fuel features to obtain a correlation between the key area features and the key fuel features; determining a recovery method for residual fuel on the inner wall of the fuel tank to be processed based on the correlation between the key area features and the key fuel features, and detecting the oil and gas concentration in the fuel tank to be processed to determine whether the recovery method for residual fuel on the inner wall of the fuel tank to be processed needs to be adjusted. The present invention can completely recover residual fuel in the fuel tank, improve recovery efficiency, and prevent damage to the fuel tank.

Description

Technical Field

[0001] The present invention relates to the technical field of residual fuel recovery in fuel tanks, and in particular to a clean recovery method for residual fuel in fuel tanks. Background Art

[0002] In modern transportation and industrial fuel storage, fuel tanks, as key fuel storage containers, are widely used in vehicles, aircraft, ships, fuel depots, and other facilities. With the increasing scarcity of energy resources and the continuous improvement of environmental protection requirements, the efficient, safe, and environmentally friendly disposal of residual fuel in fuel tanks has become a major technical issue.

[0003] During vehicle repairs, scrapping, or regular cleaning and maintenance of fuel depots, a certain amount of fuel often remains in the tank. Traditional methods of handling this fuel often have numerous drawbacks. For example, simply pouring the fuel out of the tank not only results in a significant amount of fuel waste, but also, due to the lack of effective control measures, can easily lead to fuel leakage into the environment, causing serious pollution to the soil and water bodies, and endangering the ecological balance. Furthermore, directly discharging fuel into the air increases the level of volatile organic compounds (VOCs), exacerbating air pollution and, under certain conditions, can cause safety incidents such as fires or explosions, threatening the safety of people and property.

[0004] While some existing recovery methods can recover some fuel to a certain extent, they still have significant shortcomings. For example, when using conventional suction devices, the residual fuel is difficult to completely suck out due to the complex structure of the fuel tank, the presence of many corners, grooves, and obstructions from internal components (such as wave-breaking plates, oil pumps, etc.). In particular, for fuel that is adsorbed on the inner wall of the fuel tank, attached to corners due to viscosity, or trapped by the internal structure, the recovery efficiency of conventional suction methods is extremely low. At the same time, some recovery methods may cause damage to the fuel tank itself during operation, affecting its subsequent use or disposal, or cannot guarantee the quality of the recovered fuel, causing it to contain more impurities and difficult to directly reuse. Summary of the Invention

[0005] To this end, the present invention provides a clean recovery method for residual fuel in a fuel tank, which is used to overcome the problems of incomplete recovery of residual fuel in the fuel tank, low recovery efficiency and damage to the fuel tank in the prior art.

[0006] To achieve the above object, the present invention provides a method for cleaning and recovering residual fuel in a fuel tank, comprising:

[0007] Step S1, obtaining a key adhesion area of residual fuel on the inner wall of the fuel tank to be treated, and detecting key area characteristics and key fuel characteristics of the key adhesion area, wherein the area characteristics include area, flatness, and roughness, and the fuel characteristics include density and viscosity of the fuel;

[0008] Step S2, processing the key area characteristics and the key fuel characteristics to obtain a correlation relationship between the key area characteristics and the key fuel characteristics;

[0009] Step S3, determining a recovery method for the residual fuel on the inner wall of the tank to be processed based on the correlation between the key area characteristics and the key fuel characteristics, including a first recovery method and a second recovery method;

[0010] wherein, under the first association relationship, a first recovery method is adopted to recover the residual fuel, and first gas parameters of the recovered gas introduced into the recovery process are determined based on the key fuel characteristics, the first gas parameters including a first gas flow rate, a first gas temperature, and a first gas pressure;

[0011] Under the second association relationship, a second recovery method is used to recover the residual fuel, and a key amount of the cleaning solvent is determined based on the key area characteristics, as well as second gas parameters of the recovered gas introduced during the recovery process, the second gas parameters including a second gas flow rate, a second gas temperature, and a second gas pressure;

[0012] Step S4: detecting the oil and gas concentration in the oil tank to be processed to determine whether it is necessary to adjust the recovery method of the residual fuel on the inner wall of the oil tank to be processed.

[0013] Furthermore, in step S3, the first recycling method includes:

[0014] During the recovery process, recovery gas is introduced into the key attachment area of the oil tank to be processed with a first gas parameter to detect the fluidity of the residual fuel, and whether the recovery process is completed is determined based on the fluidity of the residual fuel.

[0015] Furthermore, in step S3, the second recycling method includes:

[0016] During the recovery process, a critical amount of cleaning solvent is introduced into the oil tank to be processed and vibrated and stirred. The recovered fuel characteristics of the critical attachment area are detected. The recovered fuel characteristics are compared with the critical fuel characteristics. Based on the comparison results, it is determined whether to start introducing the recovered gas with the second gas parameter into the critical attachment area of the oil tank to be processed. The fluidity of the residual fuel is detected, and it is determined whether the recovery process is completed based on the fluidity of the residual fuel.

[0017] Furthermore, in the step S1, it includes:

[0018] The thickness of the residual fuel adhesion layer at each position of the inner wall of the fuel tank to be processed is detected, and the key adhesion area is determined according to the thickness difference of the residual fuel adhesion layer at adjacent positions of the inner wall of the fuel tank to be processed.

[0019] Furthermore, the step S2 includes:

[0020] Step S21, constructing a sample data set based on the regional characteristics of the area where the residual fuel adheres to the inner wall of the fuel tank in the historical data and the fuel characteristics;

[0021] Step S22: training the initial association relationship model according to the sample data set to obtain a target association relationship model;

[0022] Step S23: inputting the key area feature and the key fuel feature into a target association relationship model to obtain a correlation degree between the key area feature and the key fuel feature output by the target association relationship model;

[0023] In step S24 , the correlation degree is compared with a preset correlation degree, and the correlation relationship between the key area feature and the key fuel feature is determined based on the comparison result.

[0024] Furthermore, in the step S24, it includes:

[0025] If the correlation degree is less than a preset correlation degree, determining that the correlation relationship between the key area feature and the key fuel feature complies with the first correlation relationship;

[0026] If the correlation degree is greater than or equal to the preset correlation degree, it is determined that the correlation relationship between the key area feature and the key fuel feature complies with the second correlation relationship.

[0027] Furthermore, in step S3, determining the first gas parameter of the recycled gas introduced into the recycling process based on the key fuel characteristics includes:

[0028] Step S31, constructing a first parameter model based on the key fuel characteristics;

[0029] Step S32, determining a first adjustment parameter according to the first parameter model;

[0030] Step S33: determining a first gas parameter of the recycled gas introduced into the recycling process based on the first adjustment parameter.

[0031] Furthermore, in step S3, determining a critical flow rate of the cleaning solvent based on the key area characteristics includes:

[0032] Building an inner wall cleaning model based on the area of the key attachment region and the inner wall area of the oil tank to be treated;

[0033] The critical flow rate of the cleaning solvent is determined according to the inner wall cleaning model.

[0034] Furthermore, in step S3, determining the second gas parameter of the recycled gas introduced during the recycling process includes:

[0035] Step S34, determining a second adjustment parameter according to the flatness and roughness of the key attachment area;

[0036] Step S35: determining a second gas parameter of the recycled gas introduced into the recycling process based on the second adjustment parameter.

[0037] Furthermore, in the step S4, it includes:

[0038] If the oil and gas concentration in the oil tank to be processed is greater than the preset oil and gas concentration, it is determined that the recovery method of the residual fuel on the inner wall of the oil tank to be processed needs to be adjusted.

[0039] Compared with the prior art, the beneficial effect of the present invention is that, by obtaining the key attachment area of the residual fuel on the inner wall of the tank to be treated, the present invention can improve the efficiency of the subsequent determination of the recovery method and can completely recover the residual fuel in the tank. By determining the recovery method of the residual fuel based on the key area characteristics of the key attachment area and the correlation between the key fuel characteristics, residual fuel with different characteristics can be recovered more accurately, and the recovery efficiency of the residual fuel can be improved. By introducing recovery gas into the interior of the tank to be treated for recovery, damage to the tank can be avoided. By detecting the oil and gas concentration in the tank to be treated to determine whether the recovery method of the residual fuel on the inner wall of the tank to be treated needs to be adjusted, damage to the tank to be treated can be avoided, and the residual fuel in the tank can be completely recovered.

[0040] Furthermore, the present invention can improve the recovery efficiency and avoid damage to the oil tank to be processed by introducing recovery gas into the key attachment area of the oil tank to be processed with the first gas parameter. By detecting the fluidity of the residual fuel, it can determine whether the recovery process is completed, thereby ensuring that the residual fuel is completely recovered.

[0041] Furthermore, the present invention can dissolve the residual fuel and reduce the adhesion of the residual fuel by introducing a cleaning solvent into the fuel tank to be treated and vibrating and stirring it. Then, recovery gas is introduced into the key adhesion area of the fuel tank to be treated with a second gas parameter, which can improve the recovery efficiency of the residual fuel and ensure that the residual fuel is completely recovered.

[0042] Furthermore, the present invention determines the key attachment area based on the thickness difference of the residual fuel attachment layer at adjacent positions on the inner wall of the fuel tank to be processed, which can improve the efficiency and accuracy of determining the key attachment area. The residual fuel in the key attachment area is representative. By determining the subsequent processing method and corresponding parameters based on the regional characteristics and fuel characteristics corresponding to the key attachment area, it can reduce the data processing volume and improve production efficiency.

[0043] Furthermore, the present invention can improve the accuracy and efficiency of determining the association relationship by constructing a target association relationship model based on the regional characteristics of the residual fuel attachment area on the inner wall of the fuel tank in historical data and the fuel characteristics to determine the association relationship between the key regional characteristics and the key fuel characteristics.

[0044] Furthermore, the correlation between the corresponding key area characteristics and the key fuel characteristics in the first recovery mode of the present invention is relatively small, indicating that the presence of residual fuel in the key attachment area on the inner wall of the fuel tank to be processed is relatively small in relationship to the key area characteristics. Therefore, by determining the first adjustment parameter based on the key fuel characteristics to determine the first gas parameter of the recovery gas introduced during the recovery process, it is possible to improve the recovery efficiency while ensuring complete recovery and avoid damage to the fuel tank.

[0045] Furthermore, the present invention determines the critical input amount of cleaning solvent based on the area of the key attachment area and the inner wall area of the oil tank to be treated, which can ensure the accuracy of the determined critical input amount of cleaning solvent and avoid resource waste caused by excessive cleaning solvent or incomplete recovery caused by insufficient cleaning solvent.

[0046] Furthermore, the correlation between the corresponding key area characteristics and the key fuel characteristics in the second recovery method of the present invention is relatively large, indicating that the presence of residual fuel in the key attachment area on the inner wall of the fuel tank to be processed is closely related to the key area characteristics. Therefore, determining the second adjustment parameter based on the flatness and roughness of the key attachment area can improve the recovery efficiency and avoid damage to the fuel tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a flow chart of a method for cleaning and recovering residual fuel in a fuel tank according to an embodiment of the present invention;

[0048] Figure 2 Schematic diagram of the process of step S2 of an embodiment of the present invention;

[0049] Figure 3 A schematic diagram of a process for determining a first gas parameter according to an embodiment of the present invention;

[0050] Figure 4 A schematic diagram of a process for determining the second gas parameter according to an embodiment of the present invention;

[0051] Figure 5This is a logical judgment diagram for determining the recycling method in an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0053] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0054] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0055] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0056] See also Figure 1 、 Figure 5 As shown, Figure 1 This is a flow chart of a method for cleaning and recovering residual fuel in a fuel tank according to an embodiment of the present invention; Figure 5 This is a logic judgment diagram for determining a recovery method according to an embodiment of the present invention. An embodiment of the present invention provides a method for cleanly recovering residual fuel in a fuel tank, comprising:

[0057] Step S1, obtaining a key adhesion area of residual fuel on the inner wall of the fuel tank to be treated, and detecting key area characteristics and key fuel characteristics of the key adhesion area, wherein the area characteristics include area, flatness, and roughness, and the fuel characteristics include density and viscosity of the fuel;

[0058] Specifically, the step S1 includes:

[0059] Detecting the thickness of the residual fuel adhering layer at various locations on the inner wall of the fuel tank to be processed;

[0060] The key adhesion area is determined according to the thickness difference of the residual fuel adhesion layer at adjacent positions on the inner wall of the fuel tank to be processed.

[0061] It should be noted that those skilled in the art are aware that any method and device in the prior art that can detect key area characteristics and key fuel characteristics falls within the scope of protection of the present invention and will not be described in detail here.

[0062] It is understood that the thickness of the residual fuel layer attached to various locations on the inner wall of the fuel tank to be treated can be detected by endoscopy, ultrasonic testing, image recognition, or other methods. If the difference in thickness of the residual fuel layer at adjacent locations on the inner wall of the fuel tank to be treated is less than a preset difference, then the surface morphology of the residual fuel at the corresponding locations is not significantly different. If the difference in thickness of the residual fuel layer at adjacent locations on the inner wall of the fuel tank to be treated is greater than or equal to the preset difference, then the surface morphology of the residual fuel at the corresponding locations is significantly different, and such locations are identified as key locations. The largest area enclosed by the key locations is identified as the key attachment area, and the area of the inner wall of the fuel tank to be treated excluding the key attachment area is identified as the general area. Recovering residual fuel in the key attachment area is more difficult than recovering residual fuel in the general area, and it may be difficult to recover residual fuel in the key attachment area based solely on the recovery method for residual fuel in the general area. However, by determining the recovery method for residual fuel in the key attachment area, the residual fuel on the inner wall of the fuel tank to be treated can be completely recovered.

[0063] During implementation, the actual implementer may set the preset difference based on the actual situation or the average of the thickness differences of the residual fuel adhesion layer at various locations on the inner wall of the to-be-treated fuel tank that have passed the qualification test in historical data, or may calculate the average thickness of the residual fuel adhesion layer and set the preset difference to 1.1 to 1.3 times the average thickness of the residual fuel adhesion layer.

[0064] The present invention determines the key attachment area based on the thickness difference of the residual fuel attachment layer at adjacent positions on the inner wall of the fuel tank to be processed, which can improve the efficiency and accuracy of determining the key attachment area. The residual fuel in the key attachment area is representative. By determining the subsequent processing method and corresponding parameters based on the regional characteristics and fuel characteristics corresponding to the key attachment area, the data processing volume can be reduced and production efficiency can be improved.

[0065] Step S2, processing the key area characteristics and the key fuel characteristics to obtain a correlation relationship between the key area characteristics and the key fuel characteristics;

[0066] In a specific embodiment, the key area characteristics and key fuel characteristics of the key attachment area of the inner wall of the fuel tank to be processed are compared with the area characteristics and fuel characteristics of the general area, and a correlation analysis is performed to construct an association relationship model. The key area characteristics and key fuel characteristics are used as inputs, and the association relationship is used as output, so as to determine the association relationship between the key area characteristics and the key fuel characteristics.

[0067] See also Figure 2 As shown, it is a flow chart of step S2 of an embodiment of the present invention; in another specific embodiment, specifically, step S2 includes:

[0068] Step S21, constructing a sample data set based on the regional characteristics of the area where the residual fuel adheres to the inner wall of the fuel tank in the historical data and the fuel characteristics;

[0069] Step S22: training the initial association relationship model according to the sample data set to obtain a target association relationship model;

[0070] Step S23: inputting the key area feature and the key fuel feature into a target association relationship model to obtain a correlation degree between the key area feature and the key fuel feature output by the target association relationship model;

[0071] In step S24 , the correlation degree is compared with a preset correlation degree, and the correlation relationship between the key area feature and the key fuel feature is determined based on the comparison result.

[0072] It is understandable that those skilled in the art know that any neural network model in the prior art that can determine the correlation between key area characteristics and key fuel characteristics falls within the scope of protection of the present invention and will not be described in detail here.

[0073] Specifically, the step S24 includes:

[0074] If the correlation degree is less than a preset correlation degree, determining that the correlation relationship between the key area feature and the key fuel feature complies with the first correlation relationship;

[0075] If the correlation degree is greater than or equal to the preset correlation degree, it is determined that the correlation relationship between the key area feature and the key fuel feature complies with the second correlation relationship.

[0076] In practice, the implementers can actually set a preset correlation degree based on the actual situation or based on the regional characteristics of the residual fuel on the inner wall of the tank that has passed the qualification test in historical data and the average correlation between the fuel characteristics. Preferably, the preset correlation degree is set to 0.55-0.7, which can better distinguish the characteristics of the two recovery methods.

[0077] The present invention can improve the accuracy and efficiency of determining the association relationship by constructing a target association relationship model based on the regional characteristics of the residual fuel attachment area on the inner wall of the fuel tank in historical data and the fuel characteristics to determine the association relationship between key regional characteristics and key fuel characteristics.

[0078] Step S3, determining a recovery method for the residual fuel on the inner wall of the tank to be processed based on the correlation between the key area characteristics and the key fuel characteristics, including a first recovery method and a second recovery method;

[0079] wherein, under the first association relationship, a first recovery method is adopted to recover the residual fuel, and first gas parameters of the recovered gas introduced into the recovery process are determined based on the key fuel characteristics, the first gas parameters including a first gas flow rate, a first gas temperature, and a first gas pressure;

[0080] Specifically, in step S3, the first recycling method includes:

[0081] During the recovery process, recovery gas is introduced into the key attachment area of the oil tank to be processed with a first gas parameter to detect the fluidity of the residual fuel, and whether the recovery process is completed is determined based on the fluidity of the residual fuel.

[0082] The present invention can improve the recovery efficiency and avoid damage to the oil tank to be processed by introducing recovery gas into the key attachment area of the oil tank to be processed with the first gas parameter. By detecting the fluidity of the residual fuel, it can be determined whether the recovery process is completed, thereby ensuring that the residual fuel is completely recovered.

[0083] See also Figure 3 , which is a schematic diagram of a process for determining the first gas parameter according to an embodiment of the present invention; specifically, in step S3, determining the first gas parameter of the recycled gas introduced into the recycling process based on the key fuel characteristics includes:

[0084] Step S31, constructing a first parameter model based on the key fuel characteristics;

[0085] Step S32, determining a first adjustment parameter according to the first parameter model;

[0086] Step S33: determining a first gas parameter of the recycled gas introduced into the recycling process based on the first adjustment parameter.

[0087] It is understandable that accurate three-dimensional geometric modeling can be performed based on the key area characteristics of the key attachment area, and then the model can be imported into the finite element analysis software, and the key fuel characteristics can be input into the finite element model as fuel material properties. At the same time, the elastic modulus, Poisson's ratio and other mechanical properties of other solid structural materials (such as fuel tank material, pipeline material, etc.) are defined, and the geometric model is meshed. A finer mesh is used in the key attachment area to improve the analysis accuracy, while a coarser mesh can be appropriately used in places far away from the key attachment area and where the fuel characteristics are not obvious, so as to balance the calculation cost and accuracy. A no-slip boundary condition is set for the inner wall of the fuel tank (that is, the fuel velocity on the wall is zero), and the finite element solution calculation process is started according to the finite element solver. The process monitors the changes in various parameters during the solution process to perform finite element analysis simulation on the fuel density and fuel viscosity in the key adhesion area. The fuel density and fuel viscosity data of the key adhesion area are extracted from the finite element analysis results. The extracted data is sorted and preprocessed, the rationality of the data is checked, and obviously erroneous or abnormal data points are removed. The data can be visualized (such as plotting curves showing changes in density and viscosity over time or operating conditions) to intuitively observe the distribution characteristics and trends of the data. A multivariate linear regression model of fuel density and fuel viscosity is established, and the regression coefficient is calculated using the least squares method. With the goal of obtaining the first adjustment parameter, the relationship between the first adjustment parameter and the fuel density and fuel viscosity regression model is determined, and a first parameter model is constructed.

[0088] In implementation, the first gas flow rate is determined according to the product of the first adjustment parameter and the standard gas flow rate, the first gas temperature is determined according to the first adjustment parameter and the standard gas temperature, and the first gas pressure is determined according to the product of the first adjustment parameter and the standard gas pressure.

[0089] In actual application scenarios, actual implementers can set the standard gas flow rate, standard gas temperature and standard gas pressure respectively according to actual conditions or based on the average gas flow rate, average gas temperature and average gas pressure of the recovered gas that has passed the qualification test in historical data. Preferably, the standard gas flow rate value range is set to 10m / s~15m / s, the standard gas temperature value range is set to 30℃~40℃, and the standard gas pressure value range is set to 0.2MPa~0.5MPa.

[0090] The correlation between the key area characteristics and the key fuel characteristics in the first recovery method of the present invention is relatively low, indicating that the presence of residual fuel in the key attachment areas of the inner wall of the fuel tank to be processed is relatively small. The gas flow rate of the recovery gas is the first gas flow rate, which effectively removes the fuel while preventing damage to the internal structure of the fuel tank due to excessive flow rates. The gas temperature of the recovery gas is the first gas temperature. High-temperature gas can reduce the viscosity of the fuel, making it easier to flush and evaporate. However, the temperature cannot be too high. On the one hand, this is for safety reasons to avoid fuel combustion; on the other hand, excessively high temperatures may adversely affect the fuel tank material, such as causing deformation of plastic tanks or damage to the coating of metal tanks. The gas pressure of the recovery gas is the first gas pressure. Different fuel tanks have different pressure limits. During the cleaning and recovery of residual fuel, it is important to ensure that the compressed gas pressure does not exceed the pressure limit of the fuel tank. Otherwise, the tank may rupture, leading to serious safety accidents such as fuel leakage. Therefore, by determining the first adjustment parameter based on the key fuel characteristics to determine the first gas parameter of the recovery gas introduced during the recovery process, it is possible to improve the recovery efficiency while ensuring complete recovery and avoid damage to the fuel tank.

[0091] Under the second association relationship, a second recovery method is used to recover the residual fuel, and a key amount of the cleaning solvent is determined based on the key area characteristics, as well as second gas parameters of the recovered gas introduced during the recovery process, the second gas parameters including a second gas flow rate, a second gas temperature, and a second gas pressure;

[0092] Specifically, in step S3, the second recycling method includes:

[0093] During the recovery process, a critical amount of cleaning solvent is introduced into the oil tank to be processed and vibrated and stirred. The recovered fuel characteristics of the critical attachment area are detected. The recovered fuel characteristics are compared with the critical fuel characteristics. Based on the comparison results, it is determined whether to start introducing the recovered gas with the second gas parameter into the critical attachment area of the oil tank to be processed. The fluidity of the residual fuel is detected, and it is determined whether the recovery process is completed based on the fluidity of the residual fuel.

[0094] During implementation, if the recovery density of the residual fuel in the key adhesion area is less than the critical density of the residual fuel in the key adhesion area, and the recovery viscosity of the residual fuel in the key adhesion area is less than the critical viscosity of the residual fuel in the key adhesion area, it is determined to start introducing the recovery gas into the key adhesion area of the tank to be treated with the second gas parameters.

[0095] The present invention can dissolve the residual fuel by introducing a cleaning solvent into the fuel tank to be treated and performing vibration stirring, thereby reducing the adhesion ability of the residual fuel. Then, recovery gas is introduced into the key adhesion area of the fuel tank to be treated with a second gas parameter, which can improve the recovery efficiency of the residual fuel and ensure that the residual fuel is completely recovered.

[0096] Specifically, in step S3, determining the critical flow rate of the cleaning solvent based on the key area characteristics includes:

[0097] Building an inner wall cleaning model based on the area of the key attachment region and the inner wall area of the oil tank to be treated;

[0098] The critical flow rate of the cleaning solvent is determined according to the inner wall cleaning model.

[0099] In a specific embodiment, several training samples can be generated based on the area of several fuel attachment regions in historical data and the inner wall area of the corresponding fuel tank, and the corresponding cleaning solvent flow rate is used as a sample label to obtain a training sample set. The initial neural network model is trained based on the training sample set to obtain an inner wall cleaning model. The area of the key attachment region and the inner wall area of the fuel tank to be processed are input into the inner wall cleaning model, and the key flow rate of the cleaning solvent output by the inner wall cleaning model can be obtained.

[0100] It is understandable that those skilled in the art know that any neural network model in the prior art that can be trained to obtain the amount of cleaning solvent introduced falls within the scope of protection of the present invention and will not be described in detail here.

[0101] The present invention determines the critical input amount of the cleaning solvent based on the area of the key attachment area and the inner wall area of the oil tank to be treated, which can ensure the accuracy of the determined critical input amount of the cleaning solvent and avoid resource waste caused by excessive cleaning solvent or incomplete recovery caused by insufficient cleaning solvent.

[0102] See also Figure 4 , which is a schematic diagram of a process for determining the second gas parameter according to an embodiment of the present invention; specifically, in step S3, determining the second gas parameter of the recycled gas introduced into the recycling process includes:

[0103] Step S34, determining a second adjustment parameter according to the flatness and roughness of the key attachment area;

[0104] Step S35: determining a second gas parameter of the recycled gas introduced into the recycling process based on the second adjustment parameter.

[0105] In implementation, a first ratio is determined based on the ratio of a key flatness of a key attachment area to a preset flatness, a second ratio is determined based on the ratio of a key roughness of a key attachment area to a preset roughness, a second adjustment parameter is determined based on the product of the first ratio and the second ratio, a second gas flow rate is determined based on the product of the second adjustment parameter and the standard gas flow rate, a second gas temperature is determined based on the second adjustment parameter and the standard gas temperature, and a second gas pressure is determined based on the product of the second adjustment parameter and the standard gas pressure.

[0106] The correlation between the corresponding key area characteristics and the key fuel characteristics in the second recovery method of the present invention is relatively large, indicating that the presence of residual fuel in the key attachment area on the inner wall of the fuel tank to be processed is closely related to the key area characteristics. Therefore, determining the second adjustment parameter based on the flatness and roughness of the key attachment area can improve the recovery efficiency and avoid damage to the fuel tank.

[0107] Step S4: detecting the oil and gas concentration in the oil tank to be processed to determine whether it is necessary to adjust the recovery method of the residual fuel on the inner wall of the oil tank to be processed.

[0108] Specifically, the step S4 includes:

[0109] If the oil and gas concentration in the oil tank to be processed is greater than the preset oil and gas concentration, it is determined that the recovery method of the residual fuel on the inner wall of the oil tank to be processed needs to be adjusted.

[0110] In a specific embodiment, if the oil and gas concentration in the oil tank to be treated is greater than the preset oil and gas concentration, it is necessary to reduce the first gas parameter / second gas parameter corresponding to the recovery method of the residual fuel on the inner wall of the oil tank to be treated. For example, the oil and gas concentration difference can be calculated based on the oil and gas concentration in the oil tank to be treated and the preset oil and gas concentration, and then the third adjustment parameter is determined based on the ratio of the oil and gas concentration difference to the preset oil and gas concentration, and the reduction range of the first gas parameter and the second gas parameter is determined respectively according to the third adjustment parameter, wherein the reduction range of the first gas flow rate is determined according to the product of the third adjustment parameter and the first gas flow rate, the reduction range of the first gas temperature is determined according to the product of the third adjustment parameter and the first gas temperature, the reduction range of the first gas pressure is determined according to the product of the third adjustment parameter and the first gas pressure, the reduction range of the second gas flow rate is determined according to the product of the third adjustment parameter and the second gas flow rate, the reduction range of the second gas temperature is determined according to the product of the third adjustment parameter and the second gas temperature, and the reduction range of the second gas pressure is determined according to the product of the third adjustment parameter and the second gas pressure.

[0111] During implementation, the actual implementers can set the preset oil and gas concentration based on the actual situation or based on the average oil and gas concentration of damaged tank structures that have passed the qualification test in historical data. Preferably, the preset oil and gas concentration is set to 0.5 to 0.7 times the average oil and gas concentration of the maximum tolerance of the tank structure that has passed the qualification test in historical data.

[0112] It is understandable that the recovered gas may be nitrogen, carbon dioxide, air, etc., and the cleaning solvent may be gasoline, kerosene, acetone, special fuel tank cleaner, etc., which are solvents that do not chemically react with fuel.

[0113] By obtaining the key attachment areas of the residual fuel on the inner wall of the tank to be processed, the present invention can improve the efficiency of the subsequent determination of the recovery method and can completely recover the residual fuel in the tank. By determining the recovery method of the residual fuel based on the key area characteristics of the key attachment areas and the correlation between the key fuel characteristics, it is possible to more accurately recover residual fuel with different characteristics, improve the recovery efficiency of the residual fuel, and by introducing recovery gas into the interior of the tank to be processed for recovery, it is possible to avoid damage to the tank. By detecting the oil and gas concentration in the tank to be processed to determine whether it is necessary to adjust the recovery method of the residual fuel on the inner wall of the tank to be processed, it is possible to avoid damage to the tank to be processed and can completely recover the residual fuel in the tank.

[0114] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A method for cleaning and recovering residual fuel in a fuel tank, characterized in that: include: Step S1, obtaining a key adhesion area of residual fuel on the inner wall of the fuel tank to be treated, and detecting key area characteristics and key fuel characteristics of the key adhesion area, wherein the area characteristics include area, flatness, and roughness, and the fuel characteristics include density and viscosity of the fuel; Step S2, processing the key area characteristics and the key fuel characteristics to obtain a correlation relationship between the key area characteristics and the key fuel characteristics; Step S3, determining a recovery method for the residual fuel on the inner wall of the tank to be processed based on the correlation between the key area characteristics and the key fuel characteristics, including a first recovery method and a second recovery method; wherein, under the first association relationship, a first recovery method is adopted to recover the residual fuel, and first gas parameters of the recovered gas introduced into the recovery process are determined based on the key fuel characteristics, the first gas parameters including a first gas flow rate, a first gas temperature, and a first gas pressure; Under the second association relationship, a second recovery method is used to recover the residual fuel, and a key amount of the cleaning solvent is determined based on the key area characteristics, as well as second gas parameters of the recovered gas introduced during the recovery process, the second gas parameters including a second gas flow rate, a second gas temperature, and a second gas pressure; Step S4, detecting the oil and gas concentration in the oil tank to be processed to determine whether it is necessary to adjust the recovery method of the residual fuel on the inner wall of the oil tank to be processed; Wherein, the first recycling method includes: During the recovery process, a recovery gas is introduced into the key attachment area of the fuel tank to be processed with a first gas parameter to detect the fluidity of the residual fuel, and whether the recovery process is completed is determined based on the fluidity of the residual fuel; The second recycling method includes: During the recovery process, a critical amount of cleaning solvent is introduced into the fuel tank to be processed, and vibratory stirring is performed. Characteristics of recovered fuel in the critical adhesion area are detected. The recovered fuel characteristics are compared with characteristics of the critical fuel. Based on the comparison results, it is determined whether to start introducing recovery gas with a second gas parameter into the critical adhesion area of the fuel tank to be processed. The fluidity of the residual fuel is detected, and whether the recovery process is completed is determined based on the fluidity of the residual fuel. In the step S2, it includes: Step S23: inputting the key area feature and the key fuel feature into a target association relationship model to obtain a correlation degree between the key area feature and the key fuel feature output by the target association relationship model; Step S24, comparing the correlation degree with a preset correlation degree, and determining the correlation relationship between the key area feature and the key fuel feature based on the comparison result; In the step S24, it includes: If the correlation degree is less than a preset correlation degree, determining that the correlation relationship between the key area feature and the key fuel feature complies with the first correlation relationship; If the correlation degree is greater than or equal to the preset correlation degree, it is determined that the correlation relationship between the key area feature and the key fuel feature complies with the second correlation relationship.

2. The method for cleaning and recovering residual fuel in a fuel tank according to claim 1, characterized in that: In the step S1, it includes: The thickness of the residual fuel adhesion layer at each position of the inner wall of the fuel tank to be processed is detected, and the key adhesion area is determined according to the thickness difference of the residual fuel adhesion layer at adjacent positions of the inner wall of the fuel tank to be processed.

3. The method for cleaning and recovering residual fuel in a fuel tank according to claim 2, characterized in that: The step S2 includes: Step S21, constructing a sample data set based on the regional characteristics of the area where the residual fuel adheres to the inner wall of the fuel tank in the historical data and the fuel characteristics; Step S22: training the initial association relationship model according to the sample data set to obtain a target association relationship model.

4. The method for cleaning and recovering residual fuel in a fuel tank according to claim 3, characterized in that: In step S3, determining the first gas parameter of the recycled gas introduced into the recycling process based on the key fuel characteristics includes: Step S31, constructing a first parameter model based on the key fuel characteristics; Step S32, determining a first adjustment parameter according to the first parameter model; Step S33: determining a first gas parameter of the recycled gas introduced into the recycling process based on the first adjustment parameter.

5. The method for cleaning and recovering residual fuel in a fuel tank according to claim 4, characterized in that: In step S3, determining the critical flow rate of the cleaning solvent based on the key area characteristics includes: Building an inner wall cleaning model based on the area of the key attachment region and the inner wall area of the oil tank to be treated; The critical flow rate of the cleaning solvent is determined according to the inner wall cleaning model.

6. The method for cleaning and recovering residual fuel in a fuel tank according to claim 5, characterized in that: In step S3, determining the second gas parameter of the recycled gas introduced into the recycling process includes: Step S34, determining a second adjustment parameter according to the flatness and roughness of the key attachment area; Step S35: determining a second gas parameter of the recycled gas introduced into the recycling process based on the second adjustment parameter.

7. The method for cleaning and recovering residual fuel in a fuel tank according to claim 6, characterized in that: In the step S4, it includes: If the oil and gas concentration in the oil tank to be processed is greater than the preset oil and gas concentration, it is determined that the recovery method of the residual fuel on the inner wall of the oil tank to be processed needs to be adjusted.

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