CN107976228B - Fuel evaluation device and storage medium - Google Patents
Fuel evaluation device and storage medium Download PDFInfo
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- CN107976228B CN107976228B CN201711014273.1A CN201711014273A CN107976228B CN 107976228 B CN107976228 B CN 107976228B CN 201711014273 A CN201711014273 A CN 201711014273A CN 107976228 B CN107976228 B CN 107976228B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J99/00—Subject matter not provided for in other groups of this subclass
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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
- B63B49/00—Arrangements of nautical instruments or navigational aids
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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
- B63B79/00—Monitoring properties or operating parameters of vessels in operation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
Abstract
Provided are a fuel evaluation device and a storage medium, which ensure the reliability of data representing the amount of fuel consumed in a ship. The fuel evaluation device (1) compares the flow rate of fuel flowing through the fuel supply pipe (93) calculated based on the measurement result of the flow meter (2) with the reduction amount of fuel contained in the fuel tank (92) calculated based on the measurement result of the liquid level meter (3) every time a predetermined time elapses, and determines whether or not there is a mismatch between the measurement value of the flow meter (2) and the measurement value of the liquid level meter (3) based on the result of the comparison. The fuel evaluation device (1) notifies the user of the fact when a mismatch between these measured values is detected.
Description
Technical Field
The present invention relates to a technique for grasping the amount of fuel consumed in a ship.
Background
In order to grasp the fuel consumption efficiency and the like of a ship during navigation, there is a demand for accurately grasping the amount of fuel consumed in the ship. As one of methods for grasping the amount of fuel consumed in a ship, for example, there is a method of: a flow meter is used to measure the flow of fuel from the fuel tank to a fuel consuming device such as a host.
A technique of prompting a user of a flow rate of fuel measured by a flow meter is proposed. For example, patent document 1 describes the following system: instantaneous fuel consumption amounts of the main organ and the subsidiary organ are obtained based on the flow rate of the fuel measured by the pulse-generating flow meter, and a change with time and an integrated amount of the fuel consumption amounts obtained based on the obtained instantaneous fuel consumption amounts are displayed.
Patent document 1: japanese patent laid-open publication No. 2015-85924
Disclosure of Invention
Problems to be solved by the invention
As a method of grasping the amount of fuel consumed in a ship, there is a method of: the amount of fuel consumed is determined by grasping the amount of decrease in the remaining amount of fuel stored in the fuel tank. Originally, the amount of reduction in the remaining amount of fuel contained in the fuel tank should be equal to the amount of fuel consumed. However, when the fuel in which air is excessively mixed is replenished, the air that is originally mixed is released from the fuel with the passage of time, and the remaining amount of fuel decreases regardless of consumption. Therefore, there is a problem that the amount of fuel consumed cannot be accurately represented by the amount of reduction in the remaining amount of fuel.
In addition, as a method of grasping the amount and quality of fuel consumed in a ship, there is a method of: information described in a fuel supply notice (Bunker Delivery Note) provided by a supplier of the replenished fuel is used. However, the description of the fuel supply notice is not always correct. Thus, there are the following problems: if the fuel supply notice is wrongly written, the quantity and quality of the fuel cannot be accurately grasped.
In view of the above circumstances, the present invention provides a means for grasping accurate information on fuel consumed in a ship.
Means for solving the problems
The present invention provides, as a first aspect, a fuel evaluation device including: a flow rate data acquisition unit that acquires flow rate data representing a measurement value of a flow meter that measures a flow rate of fuel going from a fuel tank of a ship to a fuel consumption device; a liquid level data acquisition unit that acquires liquid level data indicating a measurement value of a liquid level meter that measures a liquid level of fuel contained in the fuel tank; a first calculation unit that calculates a fuel consumption amount in a certain period based on the flow rate data; a second calculation unit that calculates a fuel consumption amount in the certain period based on the liquid level data; a comparison unit that compares the fuel consumption amount calculated by the first calculation unit with the fuel consumption amount calculated by the second calculation unit; and a notification unit that notifies a result of the comparison by the comparison unit.
According to the fuel evaluation device of the first aspect, the user can know that either of the measurement value of the flow meter and the measurement value of the level meter is inaccurate, or that air is excessively mixed in the replenished fuel.
In the fuel evaluation device according to the first aspect described above, the following configuration may be adopted as the second aspect: the fuel tank system further includes an oil replenishment amount data acquisition unit that acquires oil replenishment amount data indicating an amount of oil replenishment that is presented by a supplier of fuel replenished to the fuel tank, the second calculation unit calculates an amount of oil replenishment based on the liquid level data before the oil replenishment and the liquid level data after the oil replenishment, and the comparison unit compares the amount of oil replenishment indicated by the oil replenishment amount data with the amount of oil replenishment calculated by the second calculation unit.
According to the fuel evaluation device of the second aspect, when any one of the measured value of the fuel level gauge and the fuel replenishment amount described in the fuel supply notice is inaccurate, the user can know that.
In addition, the present invention provides, as a third aspect, a fuel evaluation device including: a remaining amount data acquisition unit that acquires first remaining amount data indicating a remaining amount of fuel contained in a fuel tank of a ship at a first time point, and second remaining amount data indicating a remaining amount of fuel contained in the fuel tank at a second time point later than the first time point; a fuel replenishment amount data acquisition unit that acquires replenishment amount data indicating an amount of replenishment of fuel that is prompted by a supplier of fuel replenished to the fuel tank during a period from the first time point to the second time point; a flow rate data acquisition unit that acquires flow rate data representing a measurement value of a flow meter that measures a flow rate of fuel going from the fuel tank to a fuel consumption device; a calculation unit that calculates a fuel consumption amount in a period from the first time point to the second time point based on the flow rate data; a comparison means for comparing a value obtained by adding the fuel amount indicated by the fuel amount compensation data to the remaining amount of fuel specified based on the first remaining amount data and subtracting the fuel consumption amount calculated by the calculation means with the remaining amount of fuel specified based on the second remaining amount data, or performing a comparison equivalent to the comparison; and a notification unit that notifies a result of the comparison by the comparison unit.
According to the fuel evaluation device of the third aspect, when any one of the measurement value of the flow meter and the fuel replenishment amount described in the fuel supply notice is inaccurate, the user can know that.
In addition, the present invention provides, as a fourth aspect, a fuel evaluation apparatus including: a remaining amount data acquisition unit that acquires first remaining amount data indicating a remaining amount of fuel contained in a fuel tank of a ship at a first time point, and second remaining amount data indicating a remaining amount of fuel contained in the fuel tank at a second time point later than the first time point; a fuel replenishment amount data acquisition unit that acquires replenishment amount data indicating an amount of replenishment of fuel that is prompted by a supplier of fuel replenished to the fuel tank during a period from the first time point to the second time point; a liquid level data acquisition unit that acquires liquid level data indicating a measurement value of a liquid level meter that measures a liquid level of fuel contained in the fuel tank; a calculation unit that calculates a fuel consumption amount in a period from the first time point to the second time point based on the liquid level data; a comparison means for comparing a value obtained by adding the fuel amount indicated by the fuel amount compensation data to the remaining amount of fuel specified based on the first remaining amount data and subtracting the fuel consumption amount calculated by the calculation means with the remaining amount of fuel specified based on the second remaining amount data, or performing a comparison equivalent to the comparison; and a notification unit that notifies a result of the comparison by the comparison unit.
According to the fuel evaluation device of the fourth aspect, when any one of the measured value of the fuel level gauge and the amount of fuel replenishment described in the fuel supply notice is inaccurate, the user can know that.
In the fuel evaluation device according to any one of the first to fourth aspects described above, the following configuration may be adopted as a fifth aspect: a first characteristic data acquisition unit that acquires first characteristic data indicating a characteristic of the fuel to be replenished to the fuel tank, the first characteristic data being presented by a supplier of the fuel to be replenished to the fuel tank; and a second characteristic data acquisition unit that acquires second characteristic data indicating a characteristic of fuel replenished to the fuel tank, which is determined by fuel analysis means that analyzes a characteristic of fuel, wherein the comparison unit compares the characteristic indicated by the first characteristic data with the characteristic indicated by the second characteristic data.
According to the fuel evaluation device of the fifth aspect described above, when the information on the characteristics of the replenished fuel described in the fuel supply notice is inaccurate, the user can know that.
The present invention also provides a program for realizing the fuel evaluation device described above by a computer.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the reliability of data indicating the amount of fuel consumed in a ship can be ensured.
Drawings
Fig. 1 is a diagram showing the structure of a ship and an apparatus disposed in the ship according to an embodiment.
Fig. 2 is a diagram showing a configuration of a computer according to an embodiment.
Fig. 3 is a diagram showing a configuration of a fuel evaluation device according to an embodiment.
Fig. 4 is a diagram showing a data structure of a flow rate table stored in the fuel evaluation device according to the embodiment.
Fig. 5 is a diagram showing a data structure of a liquid level table stored in the fuel evaluation device according to the embodiment.
Fig. 6 is a diagram showing a data structure of a fuel property table stored in a fuel evaluation device according to an embodiment.
Fig. 7 is a diagram showing a data structure of a fuel replenishment table stored in the fuel evaluation device according to the embodiment.
Fig. 8 is a diagram showing a data structure of a remaining amount conversion table stored in the fuel evaluation device according to the embodiment.
Fig. 9 is a diagram showing a data structure of a capacity conversion factor table stored in the fuel evaluation device according to the embodiment.
Fig. 10 is a diagram showing a flow of processing performed by the fuel evaluation device according to the embodiment.
Fig. 11 is a diagram illustrating a flow of processing performed by the fuel evaluation device according to the embodiment.
Fig. 12 is a diagram illustrating a flow of processing performed by the fuel evaluation device according to the embodiment.
Fig. 13 is a diagram showing a flow of processing performed by the fuel evaluation device according to the embodiment.
Fig. 14 is a diagram showing a flow of processing performed by the fuel evaluation device according to a modification.
Fig. 15 is a diagram showing a flow of processing performed by the fuel evaluation device according to a modification.
Description of the reference numerals
1: a fuel evaluation device; 2: a flow meter; 3: a liquid level meter; 4: a fuel oil analyzing device; 5: a thermometer; 6: a thermometer; 9: a vessel; 10: a computer; 11: an operation unit; 12: an acquisition unit; 13: a storage unit; 14: a calculation unit; 15: a comparison unit; 16: a notification unit; 91: a fuel consuming device; 92: a fuel tank; 93: an oil supply pipe; 101: a processor; 102: a memory; 103: an input/output interface; 104: a touch display.
Detailed Description
[ embodiment ]
A fuel evaluation device 1 according to an embodiment of the present invention will be described below. The fuel evaluation device 1 is the following: the method comprises determining whether there is a mismatch in data indicating the amount and characteristics of fuel consumed in the ship, and notifying a user such as a driver of the ship of the determination result.
Fig. 1 is a diagram schematically showing a structure of a ship 9 and an apparatus disposed in the ship 9 (a fuel evaluation apparatus 1 and a part related to the fuel evaluation apparatus 1). The ship 9 includes a fuel consumption device 91 such as a main engine, a fuel tank 92 for storing fuel to be consumed by the fuel consumption device 91, and a fuel supply pipe 93 for forming a path for fuel to travel from the fuel tank 92 to the fuel consumption device 91, as components related to the fuel evaluation device 1.
In addition to the fuel evaluation device 1, the ship 9 is provided with a flow meter 2 and a level meter 3, the flow meter 2 measures a flow rate of the fuel from the fuel tank 92 to the fuel consumption device 91 and generates flow rate data indicating the measured flow rate, and the level meter 3 measures a level of the fuel stored in the fuel tank 92 and generates level data indicating the measured level. In the present embodiment, the flow meter 2 is a volumetric flow meter, and flow rate data indicating the measurement result of the flow meter 2 indicates the volume.
Further, the ship 9 is provided with a fuel analyzer 4, and the fuel analyzer 4 analyzes the characteristics of the fuel replenished to the fuel tank 92 and generates characteristic data indicating the analysis result. In the following description, the characteristic data indicating the characteristics of the fuel described in the fuel supply notice is referred to as first characteristic data, and the characteristic data generated by the fuel analyzer 4 is referred to as second characteristic data, and these are distinguished from each other.
The ship 9 is further provided with a thermometer 5 and a thermometer 6, the thermometer 5 measuring the temperature of the fuel passing through the flow meter 2 and generating first temperature data indicating the measured temperature, and the thermometer 6 measuring the temperature of the fuel stored in the fuel tank 92 and generating second temperature data indicating the measured temperature.
Although not shown in fig. 1, the flow meter 2, the liquid level meter 3, the fuel analyzer 4, the thermometer 5, and the thermometer 6 are communicatively connected to the fuel evaluation device 1, and the fuel evaluation device 1 can receive data generated by these devices from the flow meter 2, the liquid level meter 3, the fuel analyzer 4, the thermometer 5, and the thermometer 6.
In the present embodiment, it is assumed that the fuel evaluation device 1 is realized by executing a process following a program by a computer. However, the fuel evaluation device 1 may be a dedicated device.
Fig. 2 is a diagram schematically showing the configuration of a computer 10 for realizing the fuel evaluation device 1. The computer 10 includes a processor 101 that performs various data processing, a memory 102 that stores various data, an input/output interface 103 that inputs and outputs various data between the computer 10 and an external device, and a touch display 104 that displays various information and receives a touch operation by a user. The flow meter 2, the level meter 3, the fuel analyzer 4, the thermometer 5, and the thermometer 6 are connected to the input/output interface 103.
Note that the computer 10 may not include the touch display 104, but instead may be configured such that the touch display is connected to the computer 10 via the input/output interface 103. In addition, the following structure and the like may be adopted: the computer 10 does not include the touch display 104, but instead includes an operation device (a device that accepts an operation by a user) such as a display and a keyboard; the computer 10 does not have a display and an operation device built therein, and the display and the operation device are connected to the computer 10 via the input/output interface 103.
Fig. 3 is a diagram schematically showing the configuration of the fuel evaluation device 1. When the fuel evaluation device 1 is implemented by the computer 10, the processor 101 performs processing in accordance with a program stored in the memory 102, thereby implementing the fuel evaluation device 1 having the configuration shown in fig. 3.
The fuel evaluation device 1 includes: an operation unit 11 that accepts a user's operation of the fuel evaluation device 1; an acquisition unit 12 that acquires various data from the flow meter 2, the level meter 3, the fuel analyzer 4, the thermometer 5, the thermometer 6, and the operation unit 11; a storage unit 13 that stores various data; a calculation unit 14 that calculates a fuel consumption amount; a comparison unit 15 that performs comparison between fuel consumption amounts or between data relating to characteristics of fuel; and a notification unit 16 that notifies the user of the comparison result of the comparison unit 15.
In the present embodiment, the notification unit 16 is configured to notify the user by displaying characters, images, and the like. However, the following structure may be adopted: the notification unit 16 notifies the user of the comparison result between the data by sound, vibration, or the like in addition to display; or not displayed, but instead notified to the user by sound, vibration, or the like of the result of the comparison between the data. In this case, the computer 10 incorporates a device such as a speaker for emitting sound or a vibrator (vibrator) for generating vibration, or is connected to the computer 10 via the input/output interface 103.
The acquisition unit 12 includes: a flow rate data acquisition unit 121 that acquires flow rate data from the flow meter 2; a liquid level data acquisition unit 122 that acquires liquid level data from the liquid level meter 3; and an oil replenishment quantity data acquisition unit 123 that acquires oil replenishment quantity data indicating an oil replenishment quantity of the fuel tank 92 from the operation unit 11. The acquisition unit 12 further includes: a first characteristic data acquisition unit 124 that acquires, from the operation unit 11, first characteristic data indicating a characteristic of fuel (a characteristic described in the fuel supply notice) replenished to the fuel tank 92; and a second characteristic data acquisition unit 125 that acquires, from the fuel analysis device 4, second characteristic data indicating a characteristic of the fuel replenished to the fuel tank 92 (an analysis result of the fuel analysis device 4). The acquisition unit 12 further includes: a first temperature data acquisition unit 126 that acquires first temperature data from the thermometer 5; and a second temperature data acquisition unit 127 that acquires second temperature data from the thermometer 6.
The flow rate data acquisition unit 121 continuously acquires flow rate data from the flow meter 2, for example, every elapse of a prescribed time. The flow rate data acquired by the flow rate data acquisition unit 121 is stored in the storage unit 13. The first temperature data acquisition unit 126 continuously acquires the first temperature data from the thermometer 5, for example, every time a predetermined time elapses. The first temperature data acquired by the first temperature data acquisition unit 126 is stored in the storage unit 13. Fig. 4 is a diagram schematically showing a data structure of a flow rate table used by the storage unit 13 to store the flow rate data and the first temperature data. Data records containing the following data (hereinafter referred to as "flow records") are held in the flow meter, for example, in time series: data indicating a period during which the flow rate of fuel is measured; flow rate data indicating a measured flow rate (volume) of the fuel; and first temperature data representing the measured temperature of the fuel.
The liquid level data acquisition unit 122 continuously acquires liquid level data from the liquid level meter 3, for example, every lapse of a prescribed time. The liquid level data acquired by the liquid level data acquisition unit 122 is stored in the storage unit 13. The second temperature data acquisition unit 127 continuously acquires the second temperature data from the thermometer 6, for example, every time a predetermined time elapses. The second temperature data acquired by the second temperature data acquisition unit 127 is stored in the storage unit 13. Fig. 5 is a diagram schematically showing a data structure of a liquid level table used by the storage unit 13 to store the liquid level data and the second temperature data. In the liquid level meter, for example, data records (hereinafter referred to as "liquid level records") containing the following data are stored in time series: data representative of the time of day at which the level of fuel was measured; level data representing a measured level of fuel; and second temperature data representing the measured temperature of the fuel.
When the fuel tank 92 is replenished, the characteristics of the replenished fuel are analyzed by the fuel analyzer 4. The second characteristic data obtaining unit 125 obtains the second characteristic data representing the analysis result from the fuel analysis device 4 each time the characteristic of the fuel is analyzed by the fuel analysis device 4. The second characteristic data acquired by the second characteristic data acquisition unit 125 is stored in the storage unit 13. Fig. 6 is a diagram schematically showing a data structure of a fuel characteristic table used by the storage unit 13 to store the second characteristic data. Second characteristic data including the following data are stored in the fuel characteristic table, for example, in time series: data indicating a date and time at which the analysis of the characteristic of the fuel was performed; and data representing the characteristics of the fuel determined by the analysis. Further, the characteristics of the fuel include, for example, various items such as density, viscosity, sulfur content, and the like.
When replenishing the fuel tank 92, the operator of the ship 9 receives a fuel supply notice in which the amount and characteristics of the replenished fuel are described from the fuel supplier, and inputs information described in the fuel supply notice to the fuel evaluation device 1. The data indicating the oil replenishment amount input by the operator is received as oil replenishment amount data by the operation unit 11, acquired by the oil replenishment amount data acquisition unit 123, and then stored in the storage unit 13. The data indicating the supplemented fuel characteristic input by the operator is received as first characteristic data by the operation means 11, acquired by the first characteristic data acquisition means 124, and then stored in the storage means 13. Fig. 7 is a diagram schematically showing a data structure of the oil replenishment table used by the storage unit 13 to store the oil replenishment amount data and the first characteristic data. In the oil replenishment table, for example, data records (hereinafter referred to as "oil replenishment records") containing the following data are stored in time series: data indicating a period during which oil replenishment is performed; fuel replenishment data indicating the amount of fuel replenished (fuel replenishment); and first characteristic data representing a characteristic of the replenished fuel. The characteristics of the fuel indicated by the first characteristic data include a plurality of items such as density, viscosity, and sulfur content, as well as the characteristics of the fuel indicated by the second characteristic data generated by the fuel analyzer 4.
The calculation means 14 (see fig. 3) includes first calculation means 141 for calculating the fuel consumption amount based on the flow rate data and second calculation means 142 for calculating the fuel consumption amount based on the liquid level data.
The second calculation unit 142 determines the volume of fuel contained in the fuel tank 92 based on the liquid level indicated by the liquid level data. For this reason, the storage unit 13 stores a capacity conversion table having the data structure shown in fig. 8. The capacity conversion table is a table indicating the capacity of fuel corresponding to the level of the fuel tank 92.
In addition, the first and second calculation units 141 and 142 determine the amount of fuel according to the mass. The volume of fuel varies according to temperature. In order to exclude the influence of temperature in the amount of fuel, the first calculation unit 141 and the second calculation unit 142 convert the volume of fuel determined based on the flow rate data or the level data into mass for use. For this reason, the storage unit 13 stores therein a capacity conversion factor table of the data structure shown in fig. 9. The capacity conversion coefficient table is a table showing the ratio (coefficient) of the density of the fuel at various temperatures based on the density at 15 ℃.
Next, the operation of the fuel evaluation device 1 will be described. In the present embodiment, the fuel evaluation device 1 performs the following processing.
(1) Every time a prescribed time (for example, 1 hour) has elapsed during all but the oil replenishment period, the flow rate of the fuel determined based on the flow rate data is compared with the reduction amount of the fuel determined based on the level data to determine whether or not there is a mismatch between the flow rate data and the level data, and in the case where a mismatch is detected, notification is made.
(2) When new first characteristic data and second characteristic data are acquired as the fuel is replenished, the characteristic of the fuel indicated by the first characteristic data (the characteristic described in the fuel supply notice) and the characteristic of the fuel indicated by the second characteristic data (the analysis result of the fuel analyzer 4) are compared to determine whether or not there is a mismatch between these pieces of information, and when a mismatch is detected, a notification is made.
(3) When the fuel supply is completed, the amount of fuel supply indicated by the fuel supply amount data (the amount of fuel supply described in the fuel supply notice) is compared with the amount of fuel increase determined based on the level data before and after the fuel supply period, and it is determined whether or not there is a mismatch between these pieces of information.
(4) The fuel flow rate determined based on the flow rate data during a predetermined time (for example, 3 days) after completion of refueling is compared with the fuel reduction amount determined based on the fuel level data to determine whether or not there is air inclusion in the replenished fuel, and when air inclusion is detected, notification is performed.
Fig. 10 is a diagram showing the flow of the process (1) described above. The fuel evaluation device 1 automatically executes the processing following the flow of fig. 10 every time a predetermined time (for example, 1 hour) elapses during all periods except the period of oil replenishment.
When detecting that a predetermined time (for example, 1 hour) has elapsed since the time point at which the process of (1) was executed last time, the first calculation unit 141 extracts a flow rate record regarding a period from the time point at which the process of (1) was executed last time to the current time point (hereinafter referred to as "unconfirmed period") from the flow rate table (fig. 4), and calculates an integrated value of the flow rate (mass) indicated by the extracted flow rate record (step S101).
More specifically, in step S101, the first calculation unit 141 reads out a data string corresponding to the density (density at 15 degrees celsius) indicated by the latest data record of the fuel characteristic table (fig. 6) (or the fuel replenishment table (fig. 7)) among the data strings of the capacity conversion factor table (fig. 9). Next, the first calculation unit 141 specifies a coefficient corresponding to the temperature indicated by the first temperature data included in the flow rate record for each flow rate record extracted from the flow rate meter, and multiplies the specified coefficient by the density (density at 15 degrees celsius) indicated by the latest data record in the fuel characteristic table (fig. 6) (or the oil replenishment table (fig. 7)) to calculate the temperature-corrected density. Next, the first calculation unit 141 multiplies the density after temperature correction by the volume indicated by the flow rate data included in the flow rate record, to calculate the mass of the fuel flowing through the fuel supply pipe 93. Hereinafter, the process of determining the mass according to the fuel charge and the temperature in accordance with the charge conversion coefficient table by the first calculation means 141 in step S101 is referred to as "mass conversion process". The first calculation means 141 calculates an integrated value of the flow rate (mass) of the fuel by adding the masses of the fuel determined by the mass conversion processing for each extracted flow rate record.
In parallel with the processing of step S101, the second calculation unit 142 searches the level table (fig. 5) for a level record associated with the start time point of the unconfirmed period, and calculates the remaining amount (mass) of fuel corresponding to the level indicated by the searched level record (step S102).
More specifically, in step S102, the second calculation unit 142 determines the capacity of the fuel in the fuel tank 92 corresponding to the liquid level indicated by the liquid level data included in the searched liquid level record, in accordance with the capacity conversion table (fig. 8). Next, the second calculation unit 142 determines the mass corresponding to the specified fuel volume and the temperature indicated by the second temperature data included in the searched level record as the remaining amount (mass) of fuel at the start time point of the unconfirmed period by the mass conversion processing described above.
Next, the second calculation unit 142 searches for a fluid level record associated with the end time point of the unconfirmed period from the fluid level table (fig. 5), and determines the remaining amount (mass) of fuel corresponding to the fluid level indicated by the searched fluid level record by the same processing as that in step S102 described above (step S103).
Next, the second calculation unit 142 calculates the fuel decrease amount in the unconfirmed period by subtracting the remaining amount of fuel at the time point of the end of the unconfirmed period determined in step S103 from the remaining amount of fuel at the time point of the start of the unconfirmed period determined in step S102 (step S104).
Next, the comparing unit 15 divides the value obtained by subtracting the flow rate of the fuel in the unconfirmed period calculated in step S101 from the decrease amount of the fuel in the unconfirmed period calculated in step S104 by the flow rate of the fuel in the unconfirmed period calculated in step S101 to calculate the ratio of the difference between the flow rate and the decrease amount (step S105).
Next, the comparing section 15 determines whether or not the absolute value of the ratio of the differences calculated in step S105 is equal to or less than a predetermined threshold (step S106). If the absolute value of the ratio of the differences calculated in step S105 is equal to or less than the predetermined threshold value (step S106: "yes"), the fuel evaluation device 1 ends the series of processing.
On the other hand, if the absolute value of the ratio of the differences calculated in step S105 exceeds the predetermined threshold (step S106: no), the notification unit 16 performs, for example, "the amount of fuel reduction in the past 1 hour is much higher than the flow rate". "(case where the difference ratio is positive), or" the amount of decrease in fuel over the past 1 hour is much lower than the flow rate. "(case where the ratio of the difference is negative), and the like (step S107). After that, the fuel evaluation device 1 ends the series of processes.
By the processing of the fuel evaluation device 1, when a failure such as a failure occurs in at least one of the flow meter 2 and the liquid level meter 3, the user can promptly recognize the occurrence of the failure.
Fig. 11 is a diagram showing the flow of the process (2) described above. At the timing when the new second characteristic data is stored in the fuel characteristic table (fig. 6) and the new first characteristic data is stored in the fuel replenishment table (fig. 7), the fuel evaluation device 1 automatically executes the processing following the flow of fig. 11.
When it is detected that the new first characteristic data and the second characteristic data are stored in the storage unit 13, the comparison unit 15 calculates, for each of the plurality of items, a ratio of a difference between the characteristic of the fuel indicated by the newly stored first characteristic data and the characteristic of the fuel indicated by the newly stored second characteristic data (step S201). For example, the comparison unit 15 calculates a ratio of a difference in viscosity for a viscosity that is one of the items of the characteristic of the fuel by dividing a value obtained by subtracting the viscosity indicated by the second characteristic data from the viscosity indicated by the first characteristic data by the viscosity indicated by the second characteristic data. The comparison unit 15 calculates the ratio of the difference for other items of the fuel property as well as the viscosity.
Next, the comparing unit 15 determines whether or not the absolute values of the ratios of the differences calculated in step S201 are equal to or less than a predetermined threshold value for all items (step S202). If the absolute values of the ratios of the differences calculated in step S201 are all equal to or less than the predetermined threshold value for all items (step S202: yes), the fuel evaluation device 1 ends the series of processing.
On the other hand, if the absolute value of the ratio of the differences calculated in step S201 exceeds the predetermined threshold value for one or more items (step S202: no), the notification unit 16 performs, for example, "the viscosity indicated in the fuel supply notice is much higher than the analyzed viscosity. "(the case of a positive ratio), or" the viscosity reported by the fuel supply notice is much lower than the analyzed viscosity. "(case where the ratio of the difference is negative), and the like (step S203). After that, the fuel evaluation device 1 ends the series of processes.
By the processing of the fuel evaluation device 1, when the characteristics of the fuel described in the fuel supply notice do not match the characteristics of the fuel actually replenished, the user can promptly recognize the mismatch.
Fig. 12 is a diagram showing the flow of the process (3) described above. When the refueling is completed, the fuel evaluation device 1 executes a process following the flow of fig. 12, for example, in accordance with an instruction operation of the fuel evaluation device 1 by an operator.
The second calculation unit 142 searches the oil replenishment record during the latest period from the oil replenishment table (fig. 7) (step S301). Next, the second calculation unit 142 searches the liquid level table (fig. 5) for a liquid level record associated with the start time point of the oil replenishment period (hereinafter referred to as the "last oil replenishment period") indicated by the oil replenishment record searched for in step S301, and determines the remaining amount (mass) of fuel corresponding to the liquid level indicated by the searched liquid level record by the conversion process using the capacity conversion table (fig. 8) and the mass conversion process using the capacity conversion coefficient table (fig. 9) (step S302).
Next, the second calculation unit 142 searches the liquid level table (fig. 5) for a liquid level record associated with the end time point of the last oil replenishment period, and determines the remaining amount (mass) of fuel corresponding to the liquid level indicated by the searched liquid level record by the conversion process using the capacity conversion table (fig. 8) and the mass conversion process using the capacity conversion coefficient table (fig. 9) (step S303).
Next, the second calculation unit 142 calculates the amount of increase in fuel during the last refueling period by subtracting the remaining amount of fuel at the starting time point of the last refueling period determined in step S302 from the remaining amount of fuel at the ending time point of the last refueling period determined in step S303 (step S304).
Next, the comparing unit 15 calculates a ratio of a difference between the oil supply amount and the increase amount by dividing a value obtained by subtracting the increase amount of the fuel in the last oil supply period calculated in step S304 from the oil supply amount (mass) indicated by the oil supply amount data included in the oil supply record searched out in step S301 by the increase amount of the fuel in the last oil supply period calculated in step S304 (step S305).
Next, the comparing section 15 determines whether or not the absolute value of the ratio of the differences calculated in step S305 is equal to or less than a predetermined threshold (step S306). If the absolute value of the ratio of the differences calculated in step S305 is equal to or less than the predetermined threshold value (yes in step S306), the fuel evaluation device 1 ends the series of processing.
On the other hand, if the absolute value of the ratio of the differences calculated in step S305 exceeds the predetermined threshold (no in step S306), the notification unit 16 performs, for example, "the amount of oil replenishment described in the fuel supply notice is much higher than the amount of increase in remaining oil". "(the case where the ratio of the difference is positive), or" the amount of oil replenishment described in the fuel supply notice is much lower than the amount of increase in the remaining oil. "(case where the ratio of the difference is negative), and the like (step S307). After that, the fuel evaluation device 1 ends the series of processes.
By the processing of the fuel evaluation device 1, when the fuel supply amount described in the fuel supply notice does not match the amount of fuel actually replenished, the user can promptly recognize the mismatch.
Fig. 13 is a diagram showing the flow of the process (4) described above. After a predetermined time (for example, 3 days) has elapsed from the end time point of the last refueling period indicated by the latest refueling record stored in the refueling table (fig. 7), the fuel evaluation device 1 automatically executes the processing following the flow of fig. 13. Hereinafter, a period from the end time point of the last oil replenishment period to the elapse of a predetermined time (for example, 3 days) is referred to as "period immediately after oil replenishment".
The process following the flow of fig. 13 (the process of (4) above) is the same as the process following the flow of fig. 10 (the process of (1) above) except that the target period is different and the notification content in the case where a mismatch is detected is different. Steps S401 to S407 in fig. 13 correspond to steps S101 to S107 in fig. 10, respectively.
That is, in the process following the flow of fig. 10, a mismatch between the flow rate data and the liquid level data in a period from the time point at which the last process was performed to the current time point, that is, an unconfirmed period is detected, whereas in the process following the flow of fig. 13, a mismatch between the flow rate data and the liquid level data in a period from the end time point of the last oil replenishment period to the current time point, that is, a period immediately after oil replenishment is detected.
In the case where a mismatch occurs between the flow rate data and the level data in the period immediately after the fuel replenishment, the reason for this is that there is a high possibility that excessive air is mixed into the replenished fuel. Therefore, in step S407 of fig. 13, the notification unit 16 performs, for example, "3 days ago the replenished fuel may be mixed with air. "and the like.
By the processing of the fuel evaluation device 1, when there is a possibility that the fuel containing air is replenished, the user can promptly recognize the fact.
[ modified examples ]
The above-described embodiments can be variously modified within the scope of the technical idea of the present invention. Examples of these variations are shown below. These modifications may be combined as appropriate.
(1) When the liquid level meter 3 is not disposed in the ship 9 or when the liquid level meter 3 fails to obtain accurate liquid level data due to a failure or the like, for example, the following configuration may be adopted: each time the navigation from the departure port to the destination port is completed, the fuel evaluation apparatus 1 performs a process following the flow shown in fig. 14. In order to cause the fuel evaluation apparatus 1 to perform the processing following the flow shown in fig. 14, the operator visually measures the level (remaining amount) of the fuel contained in the fuel tank 92 using a rod-shaped level gauge or the like with a scale at the timing before the ship 9 leaves the departure port and after the ship 9 arrives at the destination port, and inputs data indicating the measurement result to the fuel evaluation apparatus 1. The data indicating the remaining amount of fuel input by the operator is received as remaining amount data by the operation means 11, acquired by remaining amount data acquisition means (not shown) provided in the fuel evaluation device 1, and then stored in the storage means 13.
After the ship 9 arrives at the destination port and the surplus data is input to the fuel evaluation device 1 by the operator, for example, the fuel evaluation device 1 performs a process following the flow shown in fig. 14 in accordance with the operation instructed by the operator.
The comparison unit 15 first extracts an oil replenishment record related to oil replenishment during the voyage from the oil replenishment table (fig. 7) (step S501). Next, the comparison means 15 specifies the remaining amount indicated by the remaining amount data inputted at the departure port, that is, the remaining amount (mass) of the fuel at the starting time point of the travel period, by the conversion processing using the capacity conversion table (fig. 8) and the mass conversion processing using the capacity conversion coefficient table (fig. 9). The comparison means 15 determines the remaining amount indicated by the remaining amount data inputted at the destination port, that is, the remaining amount (mass) of the fuel at the end time point of the travel period, by the conversion processing using the capacity conversion table (fig. 8) and the mass conversion processing using the capacity conversion coefficient table (fig. 9). Next, the comparing means 15 calculates the fuel consumption amount during the flight by adding the fuel supply amounts (the fuel supply amount and the mass described in the fuel supply notice) indicated by the fuel supply amount data included in each fuel supply record extracted in step S501 to the remaining amount (mass) of the fuel at the start time point of the flight period determined as described above, and subtracting the remaining amount (mass) of the fuel at the end time point of the flight period determined as described above (step S502).
In parallel with the processing of steps S501 to S502, the first calculation unit 141 extracts a flow rate record indicating the flow rate of the fuel during the flight from the flow rate table (fig. 4) (step S503). Next, the first calculation means 141 adds the fuel masses specified by the mass conversion processing using the capacity conversion factor table (fig. 9) for each flow rate record extracted in step S503 to calculate the integrated value of the fuel flow rate (mass) during the voyage period (step S504).
Next, the comparing unit 15 divides a value obtained by subtracting the flow rate (integrated value) of the fuel during the flight period calculated in step S504 from the consumption amount of the fuel calculated in step S502 by the flow rate of the fuel during the flight period calculated in step S504 to calculate a ratio of a difference between the flow rate and the consumption amount (step S505).
Next, the comparing unit 15 determines whether or not the absolute value of the ratio of the differences calculated in step S505 is equal to or less than a predetermined threshold value (step S506). If the absolute value of the ratio of the differences calculated in step S505 is equal to or less than the predetermined threshold value (yes in step S506), the fuel evaluation device 1 ends the series of processing.
On the other hand, if the absolute value of the ratio of the differences calculated in step S505 exceeds the predetermined threshold (no in step S506), the notification unit 16 performs, for example, "the fuel consumption amount based on the fuel replenishment amount described in the fuel supply notice is much higher than the measured flow rate. "(case where the ratio of the difference is positive), or" the fuel consumption amount based on the fuel supply amount described in the fuel supply notice is much lower than the measured flow amount. "(case where the ratio of the difference is negative), and the like (step S507). After that, the fuel evaluation device 1 ends the series of processes.
By the processing of the fuel evaluation device 1, when a trouble such as a failure occurs in the flow meter 2 or the description of the fuel supply notice is incorrect, the user can know the fact.
(2) When the flow meter 2 is not disposed in the ship 9 or when the flow meter 2 fails to obtain accurate flow rate data due to a failure or the like, for example, the following configuration may be adopted: each time the navigation from the departure port to the destination port is completed, the fuel evaluation apparatus 1 performs a process following the flow shown in fig. 15. In order to cause the fuel evaluation device 1 to perform processing following the flow shown in fig. 15, the operator visually measures the level (remaining amount) of the fuel stored in the fuel tank 92 using a rod-shaped level gauge or the like with a scale at a timing before the ship 9 leaves the departure port and after the ship 9 arrives at the destination port, and inputs data indicating the measurement result to the fuel evaluation device 1. The data indicating the remaining amount of fuel input by the operator is received as remaining amount data by the operation means 11, acquired by remaining amount data acquisition means (not shown) provided in the fuel evaluation device 1, and then stored in the storage means 13.
After the ship 9 arrives at the destination port and the fuel remaining amount data is input to the fuel evaluation device 1 by the operator, the fuel evaluation device 1 executes the processing following the flow shown in fig. 15, for example, in accordance with the instruction operation of the operator.
The comparison unit 15 performs the processing of steps S501 to S502 in fig. 14.
In parallel with the processing of steps S501 to S502, the second calculation unit 142 extracts a level record indicating the level of the fuel during the flight from the level table (fig. 5) (step S603). Next, the second calculation means 142 adds the fuel qualities determined by the conversion processing using the capacity conversion table (fig. 8) and the capacity conversion coefficient table (fig. 9) for each fuel level record extracted in step S603, and calculates the integrated value of the decrement amount (mass) of the remaining fuel amount during the voyage period (step S604). Specifically, the second calculation unit 142 calculates the amount of decrease in the remaining amount of fuel during the cruising period by integrating the amount of decrease obtained by subtracting the remaining amount corresponding to the liquid level after the decrease from the remaining amount corresponding to the liquid level before the decrease in the period indicating the decrease in the liquid level. Since the period indicating the increase in the liquid level is the period during which the fuel is replenished, the second calculation unit 142 does not calculate the increase in the remaining amount of fuel during this period into the integrated value in step S604.
Next, the comparing unit 15 divides the value obtained by subtracting the decrease amount of the fuel during the flight period calculated in step S604 from the consumption amount of the fuel calculated in step S502 by the decrease amount of the fuel during the flight period calculated in step S604 to calculate the ratio of the difference between the decrease amount and the consumption amount (step S605).
Next, the comparing unit 15 determines whether or not the absolute value of the ratio of the differences calculated in step S605 is equal to or less than a predetermined threshold value (step S606). If the absolute value of the ratio of the differences calculated in step S605 is equal to or less than the predetermined threshold value (yes in step S606), the fuel evaluation device 1 ends the series of processing.
On the other hand, when the absolute value of the ratio of the differences calculated in step S605 exceeds the predetermined threshold (step S606: "NO"), the notification unit 16 performs, for example, "the fuel consumption amount based on the fuel replenishment amount described in the fuel supply notice is much higher than the measured fuel decrease amount". "(the case where the ratio of the difference is positive), or" the amount of fuel consumed based on the amount of fuel replenishment described in the fuel supply notice is much lower than the measured amount of fuel decrease. "(case where the ratio of the difference is negative), and the like (step S607). After that, the fuel evaluation device 1 ends the series of processes.
By the processing of the fuel evaluation device 1, when a trouble such as a failure occurs in the liquid level meter 3 or the description of the fuel supply notice is incorrect, the user can know the fact.
(3) In the above-described embodiment, the fuel evaluation device 1 is disposed on the ship 9. Instead, the fuel evaluation device 1 may be disposed outside the ship 9 (e.g., on the land). In this case, a data transmitting device (not shown) that acquires data generated by the flowmeter 2, the liquid level meter 3, the fuel analyzer 4, the thermometer 5, and the thermometer 6, data visually measured by an operator, and the like is disposed in the ship 9, and transmits these data to the fuel evaluation device 1 via a communication satellite or the like, for example. The fuel evaluation device 1 performs processing related to detection of the mismatch of the data and notification thereof using the data transmitted from the data transmission device disposed in the ship 9.
(4) In the above embodiment, the following configuration may be adopted: when the fuel evaluation device 1 detects that the data does not match, the fuel evaluation device 1 notifies the external device of the detection result by transmitting data indicating the detection result to the external device via a communication satellite, for example.
(5) In the above embodiment, the number of the fuel tanks 92 is set to one, but the number of the fuel tanks 92 may be two or more. In the case where the number of the fuel tanks 92 is two or more, usually, the level gauge 3 and the thermometer 6 are provided in each of the fuel tanks 92. Thus, the second calculation unit 142 adds up the amounts of change in the remaining amount (mass) of fuel determined based on the liquid levels measured by the respective liquid level meters 3 and the temperatures measured by the thermometers 6 corresponding to the liquid level meters 3. In addition, when fuel oil of different oil types is stored in different fuel oil tanks 92, the second calculation unit 142 adds the amount of change in the remaining amount of fuel oil for each oil type.
In addition, in the case where the number of the fuel tanks 92 is two or more, the fuel supply pipe 93 is divided into a plurality of branches. When the flow meters 2 and the thermometers 5 are arranged for the plurality of branches, the first calculation means 141 adds the flow rate (volume) of the fuel determined based on the flow rate (volume) measured by each of the plurality of flow meters 2 and the temperature measured by the thermometer 5 corresponding to the flow meter 2. Further, in the case where the oils of the fuels flowing through the branches of the supply pipe 93 are different, the first calculation unit 141 adds the flow rates of the fuels by the oils.
(6) The configuration of the data stored in the storage unit 13 and the flow performed by the fuel evaluation device 1 in the above-described embodiment are merely examples, and various other configurations, flows, and the like may be adopted. For example, the calculation formula for the comparison unit 15 to calculate the ratio of the difference between the two values relating to the consumed fuel is not limited to the above calculation formula. Alternatively, instead of comparing the ratio of the difference between the two values with the threshold value, the difference between the two values may be compared to determine whether or not there is a mismatch between the data.
(7) In the above-described embodiment, the flow meter 2 is a volumetric flow meter, but the flow meter 2 may be a mass flow meter. Further, in the case where the flow meter 2 is a mass flow meter, the flow meter 2 measures the mass of the fuel flowing through the fuel supply pipe 93, so that the mass conversion processing by the calculation unit 14 is not necessary.
(8) In the above embodiment, the calculation unit 14 determines the mass of the fuel using the density corrected in accordance with the temperature. When the change in the density of the fuel according to the change in the temperature is negligibly small, the calculation unit 14 may convert the volume of the fuel into the mass using a predetermined density without performing the correction of the density according to the temperature. In addition, the following structure may be adopted: the calculation unit 14 does not determine the mass of the fuel but the volume of the fuel. In this case, the mass conversion process by the calculation unit 14 is not necessary. In this case, the comparison unit 15 does not compare the masses of the two fuels in the processing of step S106 and the like in fig. 10, but instead compares the volumes of the fuels.
(9) In the above-described embodiment, the density of the fuel may be replaced with a specific gravity (for example, a specific gravity of a substance based on water at 4 degrees celsius).
(10) In the above-described embodiment, at least one of the capacity conversion table (fig. 8) and the capacity conversion coefficient table (fig. 9) may be replaced with a conversion equation.
(11) The program according to the present invention, that is, the program executed by the computer and exemplified as the program for realizing the fuel evaluation device 1 in the above-described embodiment, may be provided in a state of being stored in a computer-readable recording medium such as an optical recording medium or a semiconductor memory, or may be provided via a communication network such as the internet. When the program according to the present invention is provided in a state of being stored in a recording medium, the computer reads the program from the recording medium and uses the program. When the program according to the present invention is provided via a communication network, the computer receives the program from the distribution source device and uses the program.
Claims (4)
1. A fuel evaluation device is provided with:
a flow rate data acquisition unit that acquires flow rate data representing a measurement value of a flow meter that measures a flow rate of fuel going from a fuel tank of a ship to a fuel consumption device;
a liquid level data acquisition unit that acquires liquid level data indicating a measurement value of a liquid level meter that measures a liquid level of fuel contained in the fuel tank;
a first calculation unit that calculates a fuel consumption amount in a certain period based on the flow rate data;
a second calculation unit that calculates a fuel consumption amount in the certain period based on the liquid level data;
a comparison unit that compares the fuel consumption amount calculated by the first calculation unit with the fuel consumption amount calculated by the second calculation unit; and
a notification unit that notifies a result of the comparison by the comparison unit,
wherein the comparing means compares the fuel consumption amount calculated by the first calculating means and the fuel consumption amount calculated by the second calculating means during a period immediately after the fuel replenishment, and the notifying means notifies that air may be mixed in the fuel at the time of the fuel replenishment when the fuel consumption amount and the fuel consumption amount are different from each other.
2. The fuel evaluation apparatus according to claim 1,
further provided with an oil replenishment amount data acquisition unit that acquires oil replenishment amount data indicating an amount of oil replenishment that is presented by a supplier of fuel replenished to the fuel tank,
the second calculation unit calculates an oil replenishment amount based on the liquid level data before oil replenishment and the liquid level data after oil replenishment,
the comparison unit compares the oil replenishment amount indicated by the oil replenishment amount data with the oil replenishment amount calculated by the second calculation unit.
3. The fuel evaluation device according to claim 1 or 2, further comprising:
a first characteristic data acquisition unit that acquires first characteristic data indicating a characteristic of fuel replenished to the fuel tank, which is prompted by a supplier of the fuel replenished; and
a second characteristic data acquisition unit that acquires second characteristic data indicating a characteristic of fuel replenished to the fuel tank, which is determined by a fuel analysis device that analyzes a characteristic of fuel,
wherein the comparison unit compares the characteristic represented by the first characteristic data with the characteristic represented by the second characteristic data.
4. A storage medium readable by a computer, storing a program for causing the computer to execute:
obtaining flow data representing a measurement of a flow meter measuring a flow of fuel from a fuel tank of the marine vessel to a fuel consuming device;
acquiring liquid level data representing a measurement value of a liquid level meter that measures a liquid level of fuel contained in the fuel tank;
calculating a fuel consumption amount in a certain period based on the flow data;
calculating a fuel consumption amount in the certain period based on the liquid level data;
comparing the fuel consumption calculated based on the flow data with the fuel consumption calculated based on the liquid level data; and
the result of the comparison is notified that,
in the period immediately after the fuel replenishment, the fuel consumption amount calculated based on the flow rate data and the fuel consumption amount calculated based on the liquid level data are compared, and when there is a difference therebetween, it is notified that there is a possibility that air is mixed in the fuel at the time of the fuel replenishment.
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| JP2016208726A JP6197089B1 (en) | 2016-10-25 | 2016-10-25 | Apparatus and program for confirming reliability of data indicating amount of fuel oil consumed in ship |
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| JP6971734B2 (en) * | 2017-09-14 | 2021-11-24 | 住友重機械マリンエンジニアリング株式会社 | Ship |
| JP2019107309A (en) * | 2017-12-20 | 2019-07-04 | パナソニックＩｐマネジメント株式会社 | Washing machine |
| CN110926571B (en) * | 2018-09-19 | 2021-04-20 | 联合汽车电子有限公司 | System and method for evaluating and correcting accuracy of fuel level sensor |
| KR102170432B1 (en) * | 2019-04-08 | 2020-10-28 | 주식회사 포스코 | Apparatus for controlling solution supply amount |
| JP7281961B2 (en) * | 2019-05-17 | 2023-05-26 | 三菱重工業株式会社 | Overflow prevention device, vessel, overflow prevention method and program |
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| JP2018069790A (en) | 2018-05-10 |
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