CN116080820A - Ship oil-water isolation oil tank with liquid level measurement function and liquid level measurement method - Google Patents
Ship oil-water isolation oil tank with liquid level measurement function and liquid level measurement method Download PDFInfo
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- CN116080820A CN116080820A CN202310056466.2A CN202310056466A CN116080820A CN 116080820 A CN116080820 A CN 116080820A CN 202310056466 A CN202310056466 A CN 202310056466A CN 116080820 A CN116080820 A CN 116080820A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B11/00—Interior subdivision of hulls
- B63B11/04—Constructional features of bunkers, e.g. structural fuel tanks, or ballast tanks, e.g. with elastic walls
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
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Abstract
The invention discloses a ship oil-water isolation oil tank with a liquid level measurement function and a liquid level measurement method, wherein the ship oil-water isolation oil tank comprises an oil tank, and an oil bag is connected to the inner wall of the top of the oil tank; the oil-water separation oil tank also comprises a pipeline system, wherein the pipeline system comprises an oil pipeline communicated with the inside of the oil bag and a water pipeline communicated with the inside of the oil tank, and flow sensors are arranged on the oil pipeline and the water pipeline; a plurality of pressure sensors are arranged on the inner wall of the bottom of the oil tank, and a plurality of ultrasonic sensors are arranged on the inner wall of the top of the oil tank; the oil-water isolation oil tank further comprises a liquid level monitoring tank, the liquid level monitoring tank comprises a data processing module, the pressure sensor and the ultrasonic sensor are connected with the data processing module, and the data processing module is used for calculating the liquid level height of water in the oil tank and the liquid level height of oil in the oil bag according to data measured by the pressure sensor and the ultrasonic sensor. The invention can obtain the liquid level height and volume of the water and the oil in the oil tank in real time, and improves the accuracy of oil quantity detection.
Description
Technical Field
The invention relates to the field of detection of oil-water liquid level of a ship oil tank, in particular to a liquid level detection device and method of a ship oil tank with oil-water isolation replacement.
Background
With the rapid development of China economy and foreign trade, domestic ship demands show a continuous growing trend, the utilization efficiency of fuel oil is improved under the condition that the ship drainage is equal, and the method has an important role in reducing the operation cost. In order to prevent pollution caused by conventional oil-water displacement of underwater oil storage, people begin to adopt oil bags with oil-water separation displacement for storing oil. But the detection of the oil tank still adopts a contact type liquid level detector, and the shaking state, the oil loading and unloading state and the shape of the oil tank are more irregular, so that the difficulty in detecting the liquid level of the oil tank and metering the total oil loading amount is greatly increased.
The Chinese patent publication No. CN111750278A discloses a ship oil tank liquid level monitoring and protecting system, which comprises a plurality of liquid level switches, wherein the liquid level switches are arranged on each oil tank, the liquid level switches are sequentially connected with a controller and a relay control unit, the relay control unit is connected with an electric valve control circuit and an alarm, a tank inlet valve and a tank inlet electric valve are arranged on tank inlet oil, two ends of the tank inlet valve and the tank inlet electric valve are connected with protective electric valves in parallel, a tank inlet oil pipe is connected with a fuel filling port through a filling flow switch and a filling valve, and when the liquid level of one oil tank exceeds the liquid level switch, the controller controls the tank inlet electric valve of the oil tank to be closed, controls the alarm to give an alarm, and controls the protective electric valves of the oil tanks with other liquid levels lower than the liquid level switch to be opened. However, the invention only considers the liquid level detection and protection of the oil tank in the process of loading and unloading oil, and can not detect the liquid level heights of water and oil in real time with high precision in the middle of ship operation.
Chinese patent publication No. CN113532587a discloses a sensor for measuring the liquid level position in a marine fuel tank and a working method thereof; the sensor comprises a mounting mechanism, a protection cylinder, a rectangular partition board, a first capacitance measuring probe, a second capacitance measuring probe and a processing module; the second capacitance measuring probe is wrapped by the insulating layer, and the bottom end position of the second capacitance measuring probe is lower than the bottom end position of the first capacitance measuring probe, so that the sensor can be based on the conventional capacitance detection and liquid level height measurement principle after being installed; according to the fitting function of the calibration data and the two capacitance measurement values acquired through the two capacitance measurement probes with different lengths, the fuel oil liquid level position and the oil-water interface position corresponding to the two capacitance measurement values are determined, the purposes of monitoring bilge immersion and simultaneously measuring the fuel oil liquid level are achieved, and further the running safety and damage-resistant pipe capacity of a ship can be improved. However, the invention is contacted with water and oil, so that pollution caused by water-oil contact cannot be avoided, and the problem of traditional oil-water replacement is not solved.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an oil-water isolation oil tank of a ship with a liquid level measurement function and a liquid level measurement method, which are used for solving at least one of the technical problems.
Based on one aspect of the invention, a ship oil-water isolation oil tank with a liquid level measurement function is provided, and comprises an oil tank, wherein an oil bag is connected to the inner wall of the top of the oil tank; the oil-water separation oil tank also comprises a pipeline system, wherein the pipeline system comprises an oil pipeline communicated with the inside of the oil bag and a water pipeline communicated with the inside of the oil tank, and flow sensors are arranged on the oil pipeline and the water pipeline; a plurality of pressure sensors are arranged on the inner wall of the bottom of the oil tank, and a plurality of ultrasonic sensors are arranged on the inner wall of the top of the oil tank; the oil-water isolation oil tank further comprises a liquid level monitoring tank, the liquid level monitoring tank comprises a data processing module, the pressure sensor and the ultrasonic sensor are connected with the data processing module, and the data processing module is used for calculating the liquid level height of water in the oil tank and the liquid level height of oil in the oil bag according to data measured by the pressure sensor and the ultrasonic sensor.
In the technical scheme, the space inside the oil bag is used for loading oil, and the space between the oil bag and the oil tank is used for loading seawater, so that the oil and water are isolated and stored. Simultaneously, an ultrasonic sensor is adopted to measure the height from the oil level of the oil bag to the top of the oil tank and the height from the bottom of the oil bag to the top of the oil tank; the pressure sensor is used for measuring the water pressure in the oil tank, and the water level height of the water is calculated by using a water pressure formula.
Further, the liquid level monitoring box also comprises a control module and an alarm module, wherein the control module is connected with the data processing module and the alarm module, and when the liquid level of water and/or the liquid level of oil calculated by the data processing module exceeds a set threshold value, the control module controls the alarm module to alarm.
Alarm module is used to alarm when the liquid level exceeds the pre-alarm height, so as to remind the staff to timely discharge oil or drain water, thereby avoiding dangerous situations.
Further, the alarm module is an audible and visual alarm.
The audible and visual alarm can alarm in various forms, and can more effectively warn staff.
Further, the oil pipeline comprises an oil injection pipeline and an oil discharge pipeline, and flow sensors are arranged on the oil injection pipeline and the oil discharge pipeline.
The oil pipeline is divided into the oil injection pipeline and the oil discharge pipeline, so that the oil tank oil pumping device can adapt to the situation that oil is required to be injected into the oil tank while oil is pumped from the oil tank.
Further, the water delivery pipeline comprises a water injection pipeline and a drainage pipeline, and flow sensors are arranged on the water injection pipeline and the drainage pipeline.
The water delivery pipeline is divided into a water injection pipeline and a drainage pipeline, so that the device can adapt to the situation that water is required to be injected into the oil tank and drained from the oil tank.
The data processing module is also used for calculating the volume of the water in the oil tank and the volume of the oil in the oil bag according to the liquid level height of the water in the oil tank and the liquid level height of the oil in the oil bag.
The volume of the liquid in the oil tank is mastered in real time by calculating the volume of the water and the volume of the oil in the oil tank, so that data support can be provided for mastering the counterweight condition in the ship navigation process.
In accordance with another aspect of the present invention, there is provided a liquid level measurement method comprising the steps of:
s1: acquiring the water pressure P measured by a pressure sensor at the current moment, the distance H from the oil surface to the top of the oil tank measured by an ultrasonic sensor and the height H from the bottom of the oil bag to the top of the oil tank;
s2: based on the water pressure P, calculating the liquid level height h of the water by adopting a water pressure formula P=ρgh 1 The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the liquid level H of the oil at a single point by adopting H-H calculation 2 The method comprises the steps of carrying out a first treatment on the surface of the Judging whether the oil bag is filled with oil or not at the current moment, if so, entering a step S3;
s3: acquiring the total oil loading volume or total oil unloading volume from the beginning of oil loading and unloading to the current moment, and calculating the oil liquid level height change delta h according to the bilge curve of the oil bag and the total oil loading volume or total oil unloading volume;
s4: acquiring the liquid level d of the oil at the beginning of loading and unloading 1 Through d 1 The +Deltah is calculated to obtain the height value d 2 Taking h 2 And d 2 And (3) taking the average value of the oil in the oil bag at the current moment as the optimal value of the liquid level height of the oil at a single point, and ending.
In the above technical solution, according to the physical principle, when the liquid level of the water in the oil tank changes, the pressure data measured by the pressure sensor also changes, so that the liquid level of the water in the oil tank can be calculated based on the pressure data measured by the pressure sensor at the bottom of the oil tank and the pressure formula of the water. Due toThe densities of the three substances are different, when the ultrasonic wave is transmitted to the surface of the oil, part of the ultrasonic wave is transmitted and acquired, so that the distance between the oil surface and the ultrasonic sensor (namely the distance H between the oil surface and the top of the oil tank) can be obtained, when the ultrasonic wave is transmitted to the position where the oil contacts the oil bag, the ultrasonic wave is reflected back, so that the distance between the bottom of the oil bag and the ultrasonic sensor (namely the height H between the bottom of the oil bag and the top of the oil tank) is obtained, and the difference (namely H-H) is the liquid level height H at a single point 2 。
If the oil is being loaded and unloaded (oil is loaded and unloaded) at the current moment, the detection of the liquid level of the oil can be influenced by the oil loading and unloading, so that the liquid level of the oil before the oil starts to be loaded and unloaded can be obtained by adopting an upper-stage method, the total volume of the loaded and unloaded oil is counted based on a flow meter, the change delta h of the liquid level is obtained by combining a bilge curve of an oil bag (delta h is a positive value when the oil is loaded and delta h is a negative value when the oil is unloaded), and the current liquid level (namely the optimal value of the liquid level of the oil at a single point in the oil bag at the current moment) can be obtained by adding the liquid level of the oil before the oil is loaded and the change of the liquid level.
Further, in step S2, if it is determined that the oil is not loaded or unloaded in the oil pocket at the current time, the process proceeds to step S5,
s5: the forward propulsion time t is the time from the last oil loading and unloading stop to the current moment, and the time period t is divided into n time points t in average 1 ,t 2 ,t 3 ...t n And obtaining the oil level a corresponding to each time point at a single point 1 ,a 2 ,a 3 ...a n ；
S6: calculation of
And get->
A corresponding to the smallest time n And a n-1 Will a n And a n-1 As the level height optimum value of the oil at the single point at the current moment.
From aboveThe oil volume in the oil tank is kept unchanged from the start of one-time oil loading and unloading to the current moment, and the measured values of the oil liquid level heights at different moments are different due to the fact that the ship is in a swaying state in the running process, so that the oil liquid level heights at two adjacent moments when the ship runs most stably (namely
A corresponding to the smallest time n And a n-1 ) The average value of (2) is the current oil level height, and the obtained result is the most accurate.
Further, the method also comprises the step of calculating the volumes of water and oil in the single oil tank based on the optimized values of the liquid level heights of the oil at all single points at the current moment and the liquid level heights of the water in the oil tank, wherein the specific steps are as follows:
s7: acquiring position information, oil tank shape characteristics and oil tank posture characteristics of each pressure sensor and ultrasonic sensor, and measuring the liquid level height h of water at each point 1 And converting the optimized value of the liquid level height of the oil into a coordinate point;
s8: performing third-order spline interpolation according to coordinate data of each point, performing surface fitting on interpolation points obtained by interpolation and each point to obtain a water-gas curved surface, an oil-water curved surface, an oil-gas curved surface and an oil-oil pocket curved surface, and simultaneously obtaining a water-gas curved surface equation, an oil-water curved surface equation, an oil-gas curved surface equation and an oil-oil pocket curved surface equation; the water-gas curved surface, the oil-water curved surface and the oil-oil bag curved surface are surrounded to form a three-dimensional shape of water, and the oil-gas curved surface and the oil-oil bag curved surface are surrounded to form a three-dimensional shape of oil;
s9: three-dimensional integration is carried out on the three-dimensional shape of the oil to obtain the volume of the oil in the single oil tank; and carrying out three-dimensional integration on the three-dimensional shape of the water to obtain the volume of the water in the single oil tank.
The bottom of the oil tank and the top of the oil tank are respectively regarded as two horizontal coordinate systems (the origins of the two horizontal coordinate systems coincide in the vertical direction), the X coordinate and the Y coordinate of each sensor are obtained on the horizontal coordinate systems, the X coordinate and the Y coordinate of each sensor are the X coordinate and the Y coordinate of the corresponding measuring point, the liquid level depth of the measuring point (the liquid level depth of water or the liquid level depth of oil) is the Z coordinate of the measuring point, each point can be converted into a coordinate point by the method, and three-dimensional coordinate data of each coordinate point are obtained.
Further, the method also comprises the step of calculating the total volume of the oil in the current ship based on the volume of the oil in the single oil tank, wherein the specific steps are as follows:
s10: judging whether oil loading and unloading are performed at the current moment, if not, entering a step S11, and if so, entering a step S12;
s11: acquiring the volume of oil in each oil tank when the oil loading and unloading is stopped last time, and adding the volume of oil in each oil tank to obtain the total volume V of oil in the ship when the oil loading and unloading is stopped last time 1 Calculating total oil loss delta V of the ship from last loading and unloading to the current moment according to the daily oil loss of the ship 1 The total volume of the oil in the ship at the current moment is V 1 -ΔV 1 And (3) finishing calculation;
s12: acquiring the volume of oil in each oil tank before the oil loading and unloading is started, and adding the volumes in each oil tank to obtain the total volume V of the oil in the ship before the oil loading and unloading is started 2 ；
S13: obtaining total loading and unloading quantity delta V from the beginning of loading and unloading oil to the current moment according to the flow data of the flowmeter 2 And the total oil discharge amount DeltaV 3 The method comprises the steps of carrying out a first treatment on the surface of the The total volume of the oil in the current ship is V 2 +ΔV 2 -ΔV 3 The calculation is ended.
The daily fuel consumption includes the fuel consumption of the ship itself and the volatilization of the oil. The loading and unloading amount is the amount of oil loaded from the outside of the ship into the ship, and the unloading amount is the amount of oil discharged from the inside of the ship to the outside of the ship.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the ship oil-water isolation oil tank with the liquid level measurement function, water and oil are physically isolated by utilizing the oil bag, so that the problem of pollution to sea water caused by water-oil contact during water discharge during traditional oil-water isolation replacement is solved, the quality of oil is ensured, the water-oil tank body is integrated, and the fuel oil loading capacity of a ship is improved. Simultaneously, an ultrasonic sensor is adopted to measure the height from the oil level of the oil bag to the top of the oil tank and the height from the bottom of the oil bag to the top of the oil tank; the pressure sensor is used for measuring the water pressure in the oil tank, and the water level height of the water is calculated by utilizing a water pressure formula, so that the water level height of the water in the oil tank and the oil level height are obtained in real time.
(2) According to the liquid level measurement method provided by the invention, based on the condition that the ship oil tank working condition is considered, three-level algorithm is set, the liquid level height of a single point is detected through a single liquid level sensor, the volume of the single oil tank is detected through a plurality of liquid level sensors, and finally the total volume of the plurality of oil tanks is detected through a plurality of liquid level sensors of the single ship, and the three-level algorithm is matched and is advanced layer by layer, so that the calculation efficiency of the oil quantity is greatly improved.
(3) According to the invention, the oil quantity detection precision is improved by considering the structural characteristics of the oil tank, the ship roll angle, the pitch angle, the acceleration and other ship attitude changes.
(4) According to the invention, three-order spline difference values are carried out on the oil-water page space coordinate data obtained by the sensor, the obtained coordinates are smoothed, bilge curves are collected, three-dimensional integration is carried out on bilge-water surface and water-oil surface, so that the volume and the three-dimensional shape are obtained, and the precision of non-contact liquid level detection of the ship oil tank is greatly improved.
Drawings
FIG. 1 is a schematic view of a marine oil-water separation tank according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of measuring oil-water level of a single oil tank according to an embodiment of the invention;
FIG. 3 is a flow chart of a method for detecting oil-water volume of a single oil tank according to an embodiment of the invention;
FIG. 4 is a flow chart of a method for detecting total oil loading in a ship tank according to an embodiment of the invention;
FIG. 5 is a schematic diagram of a cargo tank control according to an embodiment of the present invention;
FIG. 6 is a sensor position layout diagram according to an embodiment of the present invention;
fig. 7 is a view showing the composition of an oil-water separation tank according to an embodiment of the present invention.
In the figure: 1. an oil tank; 101. a water injection pipe; 102. a drainage pipe; 103. a ventilation valve; 2. an oil bag; 201. an oil injection pipeline; 202. an oil discharge pipeline; 3. an ultrasonic sensor; 4. a pressure sensor.
Detailed Description
The following description of the embodiments of the present invention will be made in detail and with reference to the accompanying drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Example 1
As shown in fig. 1 and 7, the embodiment provides a ship oil-water isolation oil tank with a liquid level measurement function, which comprises an oil tank 1, wherein an oil bag 2 is connected to the inner wall of the top of the oil tank 1; the oil-water isolation oil tank also comprises a pipeline system, wherein the pipeline system comprises an oil pipeline communicated with the inside of the oil bag 2 and a water pipeline communicated with the inside of the oil tank 1, and flow sensors are arranged on the oil pipeline and the water pipeline; as shown in fig. 6, a plurality of pressure sensors 4 are arranged on the inner wall of the bottom of the oil tank 1, and a plurality of ultrasonic sensors 3 are arranged on the inner wall of the top of the oil tank 1; the oil-water isolation oil tank 1 further comprises a liquid level monitoring box, the liquid level monitoring box comprises a data processing module, the pressure sensor 4 and the ultrasonic sensor 3 are connected with the data processing module, and the data processing module is used for calculating the liquid level height of water in the oil tank 1 and the liquid level height of oil in the oil bag 2 according to data measured by the pressure sensor 4 and the ultrasonic sensor 3.
The oil bag 2 is made of a flexible diaphragm and has the characteristic of isolating oil and water. The space inside the oil bag 2 is used for loading oil, and the space between the oil bag 2 and the oil tank 1 is used for loading seawater, so that the oil and water are isolated and stored.
In this embodiment, an ultrasonic sensor 3 (in this embodiment, an ultrasonic level gauge) is used to measure the height from the oil level of the oil bag 2 to the top of the oil tank 1 and the height from the bottom of the oil bag 2 to the top of the oil tank 1, a pressure sensor 4 (40 PC100G2A type pressure sensor 4) is used to measure the water pressure in the oil tank 1, and the water level of the water is calculated by using a water pressure formula.
As shown in fig. 5, in this embodiment, the liquid level monitoring box is connected with a signal control box, where the signal control box collects signals transmitted by the sensors and transmits the signals to the liquid level monitoring box, and the signal control box is further used to supply power to the sensors.
The liquid level monitoring box further comprises a display screen for displaying collected monitoring data and calculated liquid level data and volume data, so that workers can conveniently and intuitively know the liquid level and volume conditions in the oil tank 1.
The liquid level monitoring box further comprises a data storage module for storing detection data, calculated liquid level height data and liquid volume data, and later checking and rechecking are facilitated.
As a preferred implementation mode, the liquid level monitoring box further comprises a control module and an alarm module, wherein the control module is connected with the data processing module and the alarm module, and when the liquid level of water and/or the liquid level of oil calculated by the data processing module exceeds a set threshold value, the control module controls the alarm module to alarm.
Alarm module is used to alarm when the liquid level exceeds the pre-alarm height, so as to remind the staff to timely discharge oil or drain water, thereby avoiding dangerous situations.
As a preferred embodiment, the alarm module is an audible and visual alarm.
The audible and visual alarm can alarm in various forms, and can more effectively warn staff.
As a preferred embodiment, the oil delivery pipeline includes an oil injection pipeline 201 and an oil discharge pipeline 202, and flow sensors are disposed on the oil injection pipeline 201 and the oil discharge pipeline 202.
The separation of the oil delivery pipeline into the oil injection pipeline 201 and the oil discharge pipeline 202 can be adapted to the situation that the oil is required to be discharged from the oil tank 1 while the oil is loaded into the oil tank 1.
As a preferred embodiment, the water pipe includes a water injection pipe 101 and a water discharge pipe 102, and flow sensors are disposed on both the water injection pipe 101 and the water discharge pipe 102.
The water pipe is divided into the water injection pipe 101 and the water discharge pipe 102, so that the water can be discharged from the oil tank 1 while water is injected into the oil tank 1.
As a preferred embodiment, a filter is provided on the water injection pipe 101, and the filter is used to ensure that the injected water does not contain impurities such as particulate matters.
As a preferred embodiment, the oil tank 1 is provided with a ventilation valve 103, and the ventilation valve 103 communicates with the interior of the oil bag 2. The ventilation valve 103 is used to prevent overpressure or overpressure loss in the oil bag 2.
As a preferred embodiment, the data processing module is further configured to calculate the volume of water in the oil sump 1 and the volume of oil in the oil bag 2 based on the level of water in the oil sump 1 and the level of oil in the oil bag 2.
By calculating the volume of water and the volume of oil in the oil tank 1, the volume of liquid in the oil tank 1 is mastered in real time, and data support can be provided for mastering the counterweight condition in the ship navigation process.
Example 2
As shown in fig. 2 and 3, the present embodiment provides a liquid level measurement method, including the steps of:
s1: acquiring the water pressure P measured by a pressure sensor at the current moment, the distance H from the oil surface to the top of the oil tank measured by an ultrasonic sensor and the height H from the bottom of the oil bag to the top of the oil tank;
s2: based on the water pressure P, the water level height (bilge to water surface height) h is calculated by using a water pressure formula p=pgh 1 The method comprises the steps of carrying out a first treatment on the surface of the The liquid level height (height from the bottom of the oil bag to the oil surface) H of the oil at a single point is calculated by adopting H-H 2 The method comprises the steps of carrying out a first treatment on the surface of the Judging whether the oil bag is filled with oil or not at the current moment, if so, entering a step S3;
s3: acquiring the total oil loading volume or total oil unloading volume from the beginning of oil loading and unloading to the current moment, and calculating the oil liquid level height change delta h according to the bilge curve of the oil bag and the total oil loading volume or total oil unloading volume;
s4: acquiring the liquid level d of the oil at the beginning of loading and unloading 1 Through d 1 +Δh (when filling oil) or d 1 - Δh (during oil discharge) to obtain the height d 2 Taking h 2 And d 2 And (3) taking the average value of the oil in the oil bag at the current moment as the optimal value of the liquid level height of the oil at a single point, and ending.
Before shipping, obtaining a first bilge curve for oil and a second bilge curve for water through experiments, wherein the abscissa of the first bilge curve is the liquid level height of the oil, and the ordinate is the volume of the oil; the abscissa of the second bilge curve is the liquid level height of water in the oil tank, the ordinate is the volume of water, and the volume of water at any moment is the volume of oil in the whole oil tank deducted oil bag.
According to the physical principle, when the liquid level of the water in the oil tank changes, the pressure data measured by the pressure sensor also changes, so that the liquid level of the water in the oil tank can be calculated based on the pressure data measured by the pressure sensor at the bottom of the oil tank and a pressure formula of the water. Because the densities of the three substances are different, when the ultrasonic wave is transmitted to the surface of the oil, part of the ultrasonic wave is transmitted and acquired, so that the distance between the oil surface and the ultrasonic sensor (namely the distance H between the oil surface and the top of the oil tank) can be obtained, when the ultrasonic wave is transmitted to the position where the oil contacts the oil bag, the ultrasonic wave is reflected back, so that the distance between the bottom of the oil bag and the ultrasonic sensor (namely the height H between the bottom of the oil bag and the top of the oil tank) is obtained, and the difference (namely H-H) is the liquid level height H at a single point 2 。
If the oil is being loaded and unloaded (loaded and unloaded) at the current moment, the detection of the liquid level of the oil can be influenced by the oil loading and unloading, so that the liquid level of the oil before the oil starts to be loaded and unloaded can be obtained by adopting an upper-stage method, the total volume of the loaded and unloaded oil counted by a flow meter is based on the total volume of the loaded and unloaded oil, the liquid level change delta h is obtained by combining a bilge curve of an oil bag, and the current liquid level (namely, the liquid level optimized value of the oil at a single point in the oil bag at the current moment) can be obtained by adding or subtracting the liquid level of the oil before the oil is loaded and unloaded from the liquid level change.
In a preferred embodiment, in step S2, if it is determined that the oil is not loaded or unloaded in the oil pocket at the present time, the process proceeds to step S5,
s5: the forward propulsion time t is the time from the last oil loading and unloading stop to the current moment, and the time period t is divided into n time points t in average 1 ,t 2 ,t 3 ...t n And obtaining the oil level a corresponding to each time point at a single point 1 ,a 2 ,a 3 ...a n ；
S6: calculation of
And get->
A corresponding to the smallest time n And a n-1 Will a n And a n-1 As the level height optimum value of the oil at the single point at the current moment.
The volume of the oil in the oil tank is kept unchanged from the last time of loading and unloading the oil to the current moment, and the measured values of the liquid level heights of the oil at different moments are different because the ship is in a swaying state in the running process, so that the liquid level heights of the oil at two adjacent moments when the ship runs most stably (namely
A corresponding to the smallest time n And a n-1 ) The average value of (2) is the current oil level height, and the obtained result is the most accurate.
As a preferred embodiment, as shown in fig. 4, the method provided in this example further includes calculating the volumes of water and oil in a single oil tank based on the optimal values of the liquid level of oil at all single points at the current moment and the liquid level of water in the oil tank, and specifically includes the following steps:
s7: acquiring position information, oil tank shape characteristics and oil tank posture characteristics of each pressure sensor and each ultrasonic sensor, and converting the measured optimized values of the liquid level height of water and the liquid level height of oil at each point position into coordinate points;
s8: performing third-order spline interpolation according to coordinate data of each point, performing surface fitting on interpolation points obtained by interpolation and each point to obtain a water-gas curved surface, an oil-water curved surface, an oil-gas curved surface and an oil-oil pocket curved surface, and simultaneously obtaining a water-gas curved surface equation, an oil-water curved surface equation, an oil-gas curved surface equation and an oil-oil pocket curved surface equation; the water-gas curved surface, the oil-water curved surface and the oil-oil bag curved surface are surrounded to form a three-dimensional shape of water, and the oil-gas curved surface and the oil-oil bag curved surface are surrounded to form a three-dimensional shape of oil;
s9: three-dimensional integration is carried out on the three-dimensional shape of the oil to obtain the volume of the oil in the single oil tank; and carrying out three-dimensional integration on the three-dimensional shape of the water to obtain the volume of the water in the single oil tank. In this embodiment, after obtaining the volumes of oil and water in the single oil tank, the calculated value is compared with the ideal value in the standard verification state in error, if the error is less than 0.0003, the calculated volume data is output, and if the error is greater than 0.0003, the step returns to step S1. And (3) obtaining a data relationship (namely a bilge curve) between the liquid level height and the liquid volume through experiments before shipping, wherein the liquid volume obtained based on the data relationship and the liquid level height is an ideal value.
The bottom of the oil tank and the top of the oil tank are respectively regarded as two horizontal coordinate systems (the origins of the two horizontal coordinate systems coincide in the vertical direction), the X coordinate and the Y coordinate of each sensor are obtained on the horizontal coordinate systems, the X coordinate and the Y coordinate of each sensor are the X coordinate and the Y coordinate of the corresponding measuring point, the liquid level depth of the measuring point (the liquid level depth of water or the liquid level depth of oil) is the Z coordinate of the measuring point, each point can be converted into a coordinate point by the method, and three-dimensional coordinate data of each coordinate point are obtained.
As a preferred embodiment, the method further comprises calculating the total volume of oil in the current vessel based on the volume of oil in the single oil compartment, by the following steps:
s10: judging whether oil loading and unloading are performed at the current moment, if not, entering a step S11, and if so, entering a step S12;
s11: acquiring the volume of oil in each oil tank when the oil loading and unloading is stopped last time, and adding the volume of oil in each oil tank to obtain the total volume V of oil in the ship when the oil loading and unloading is stopped last time 1 Calculating total oil loss delta V of the ship from last loading and unloading to the current moment according to the daily oil loss of the ship 1 The total volume of the oil in the ship at the current moment is V 1 -ΔV 1 And (3) finishing calculation;
s12: acquiring the volume of oil in each oil tank before the oil loading and unloading is started, and adding the volumes in each oil tank to obtain the total volume V of the oil in the ship before the oil loading and unloading is started 2 ；
S13: obtaining total oil filling quantity DeltaV from oil filling and discharging to current moment according to flow data of flowmeter 2 And the total oil discharge amount DeltaV 3 The method comprises the steps of carrying out a first treatment on the surface of the The total volume of the oil in the current ship is V 2 +ΔV 2 -ΔV 3 The calculation is ended.
As a preferred embodiment, after remembering the total volume of oil in the ship, judging whether the total volume of oil is larger than the sum of the volumes of all the oil tanks of the ship, if not, outputting the volume data of the oil, and if so, alarming by an alarm module.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; these modifications or substitutions do not depart from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.
Claims (10)
1. The ship oil-water isolation oil tank with the liquid level measurement function is characterized by comprising an oil tank, wherein the inner wall of the top of the oil tank is connected with an oil bag; the oil-water separation oil tank also comprises a pipeline system, wherein the pipeline system comprises an oil pipeline communicated with the inside of the oil bag and a water pipeline communicated with the inside of the oil tank, and flow sensors are arranged on the oil pipeline and the water pipeline; a plurality of pressure sensors are arranged on the inner wall of the bottom of the oil tank, and a plurality of ultrasonic sensors are arranged on the inner wall of the top of the oil tank; the oil-water isolation oil tank further comprises a liquid level monitoring tank, the liquid level monitoring tank comprises a data processing module, the pressure sensor and the ultrasonic sensor are connected with the data processing module, and the data processing module is used for calculating the liquid level height of water in the oil tank and the liquid level height of oil in the oil bag according to data measured by the pressure sensor and the ultrasonic sensor.
2. The ship oil-water isolation oil tank with the liquid level measurement function according to claim 1, wherein the liquid level monitoring box further comprises a control module and an alarm module, the control module is connected with the data processing module and the alarm module, and when the liquid level of water and/or the liquid level of oil calculated by the data processing module exceeds a set threshold value, the control module controls the alarm module to alarm.
3. The ship oil-water separation tank with the liquid level measurement function according to claim 2, wherein the alarm module is an audible and visual alarm.
4. The ship oil-water isolation oil tank with the liquid level measurement function according to claim 1, wherein the oil pipeline comprises an oil injection pipeline and an oil discharge pipeline, and flow sensors are arranged on the oil injection pipeline and the oil discharge pipeline.
5. The ship oil-water separation oil tank with the liquid level measurement function according to claim 1, wherein the water delivery pipeline comprises a water injection pipeline and a drainage pipeline, and flow sensors are arranged on the water injection pipeline and the drainage pipeline.
6. The ship oil-water separation tank with a liquid level measurement function according to claim 1, wherein the data processing module is further used for calculating the volume of water in the tank and the volume of oil in the oil bag according to the liquid level height of water in the tank and the liquid level height of oil in the oil bag.
7. A liquid level measurement method for realizing liquid level measurement of the oil-water isolation oil tank of the ship with the liquid level measurement function according to any one of claims 1 to 6, characterized by comprising the steps of:
s1: acquiring the water pressure P measured by a pressure sensor at the current moment, the distance H from the oil surface to the top of the oil tank measured by an ultrasonic sensor and the height H from the bottom of the oil bag to the top of the oil tank;
s2: based on the water pressure P, calculating the liquid level height h of the water by adopting a water pressure formula P=ρgh 1 The method comprises the steps of carrying out a first treatment on the surface of the Obtaining the liquid level H of the oil at a single point by adopting H-H calculation 2 The method comprises the steps of carrying out a first treatment on the surface of the Judging whether the oil bag is filled with oil or not at the current moment, if so, entering a step S3;
s3: acquiring the total oil loading volume or total oil unloading volume from the beginning of oil loading and unloading to the current moment, and calculating the oil liquid level height change delta h according to the bilge curve of the oil bag and the total oil loading volume or total oil unloading volume;
s4: acquiring the liquid level d of the oil at the beginning of loading and unloading 1 Through d 1 The +Deltah is calculated to obtain the height value d 2 Taking h 2 And d 2 And (3) taking the average value of the oil in the oil bag at the current moment as the optimal value of the liquid level height of the oil at a single point, and ending.
8. The liquid level measuring method according to claim 7, wherein in step S2, if it is judged that the oil is not loaded and unloaded in the oil pocket at the present time, the process proceeds to step S5,
s5: the forward propulsion time t is the time from the last oil loading and unloading stop to the current moment, and the time period t is divided into n time points t in average 1 ,t 2 ,t 3 ...t n And obtaining the oil level a corresponding to each time point at a single point 1 ,a 2 ,a 3 ...a n ；
S6: calculation of
And get->
A corresponding to the smallest time n And a n-1 Will a n And a n-1 As the level height optimum value of the oil at the single point at the current moment.
9. The method of measuring the liquid level of claim 8, further comprising calculating the volumes of water and oil for a single tank based on the optimal values of the liquid level of oil at all single points at the current time and the liquid level of water in the tank, comprising the steps of:
s7: acquiring position information, oil tank shape characteristics and oil tank posture characteristics of each pressure sensor and ultrasonic sensor, and measuring the liquid level height h of water at each point 1 And converting the optimized value of the liquid level height of the oil into a coordinate point;
s8: performing third-order spline interpolation according to coordinate data of each point, performing surface fitting on interpolation points obtained by interpolation and each point to obtain a water-gas curved surface, an oil-water curved surface, an oil-gas curved surface and an oil-oil pocket curved surface, and simultaneously obtaining a water-gas curved surface equation, an oil-water curved surface equation, an oil-gas curved surface equation and an oil-oil pocket curved surface equation; the water-gas curved surface, the oil-water curved surface and the oil-oil bag curved surface are surrounded to form a three-dimensional shape of water, and the oil-gas curved surface and the oil-oil bag curved surface are surrounded to form a three-dimensional shape of oil;
s9: three-dimensional integration is carried out on the three-dimensional shape of the oil to obtain the volume of the oil in the single oil tank; and carrying out three-dimensional integration on the three-dimensional shape of the water to obtain the volume of the water in the single oil tank.
10. The method of measuring the liquid level according to claim 9, wherein the method further comprises calculating the total volume of oil in the current vessel based on the volume of oil in the single oil compartment, by the steps of:
s10: judging whether oil loading and unloading are performed at the current moment, if not, entering a step S11, and if so, entering a step S12;
s11: acquiring the volume of oil in each oil tank when the oil loading and unloading is stopped last time, and adding the volume of oil in each oil tank to obtain the total volume V of oil in the ship when the oil loading and unloading is stopped last time 1 Calculating total oil loss delta V of the ship from last loading and unloading to the current moment according to the daily oil loss of the ship 1 The total volume of the oil in the ship at the current moment is V 1 -ΔV 1 And (3) finishing calculation;
s12: acquiring the volume of oil in each oil tank before the oil loading and unloading is started, and adding the volumes in each oil tank to obtain the total volume V of the oil in the ship before the oil loading and unloading is started 2 ；
S13: obtaining total oil filling quantity DeltaV from oil filling and discharging to current moment according to flow data of flowmeter 2 And the total oil discharge amount DeltaV 3 The method comprises the steps of carrying out a first treatment on the surface of the The total volume of the oil in the current ship is V 2 +ΔV 2 -ΔV 3 The calculation is ended.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310056466.2A CN116080820A (en) | 2023-01-17 | 2023-01-17 | Ship oil-water isolation oil tank with liquid level measurement function and liquid level measurement method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310056466.2A CN116080820A (en) | 2023-01-17 | 2023-01-17 | Ship oil-water isolation oil tank with liquid level measurement function and liquid level measurement method |
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