JP2004271476A - Method of and apparatus for testing fuel oil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of and an apparatus for easily testing fuel oil of a diesel engine for ships. <P>SOLUTION: The apparatus for testing fuel oil 1, for testing whether heavy oil used as fuel of the diesel engine for ships generates soot leading to engine troubles, comprises a quantifying means 10 for quantifying heavy oil and a suspension rod 30 for holding the quantified heavy oil as droplets. A droplet F held by the suspension rod 30 burns in a combustion chamber 40. The burning time of the droplet F from ignition to extinction is measured by a measurement means 60, and the burning condition of the droplet F is observed by an observation means 80. For the droplet F, of which the burning time is shorter than a threshold and the one of which the burning time is longer than the threshold, by observing the amount of soot adhered to the suspension rod 30; after extinction, one having small amount of adhered soot is determined as having passed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for testing heavy oil or the like as a fuel for a marine diesel engine. In particular, the present invention relates to a method and an apparatus that can easily determine the quality of heavy oil when refueling at an unknown port of call.
[0002]
2. Prior Art and Problems to be Solved by the Invention
In a marine diesel engine, a trouble that may be caused by heavy oil used as fuel, particularly heavy fuel oil C (JIS K2205 regulation) may occur. For example, when low-quality fuel oil is used, a large amount of soot is generated during combustion. Furthermore, soot may remain without burning even after the end of combustion. If the remaining soot adheres to the inner surface of the cylinder, the piston and the inner surface of the cylinder will wear, causing scuffing, and adhering to the surface of the heat exchanger (exhaust gas economizer), reducing the heat transfer coefficient. Occurs.
[0003]
The first method to identify heavy oils that cause such problems is to measure various physical properties of the heavy oils (density, viscosity, microcarbon residue, metal content, pour point, ignition point, etc.) The use of heavy oil with certain physical properties. However, there is no clear correlation between the measured result and the length of combustion time or the amount of soot generated, and it is difficult to determine the quality of heavy oil using physical property values.
[0004]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a method and an apparatus that can easily test fuel oil of a marine diesel engine.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a fuel oil test method of the present invention is a method for testing whether heavy oil used as a fuel for a marine diesel engine generates soot that causes engine failure, and includes a method for determining whether a predetermined amount Holding the heavy oil as a droplet on a holding member, introducing the holding member and the liquid into a high-temperature air atmosphere at a predetermined temperature, measuring a combustion time from the ignition of the droplet to the extinguishing, A combustion time shorter than a predetermined threshold is determined to be acceptable.
Since the combustion time of the fuel can be measured by relatively simple means, the quality of the fuel can be easily tested. Thus, although somewhat more accurate than the test results conducted in expensive combustion test apparatus which performs spray combustion under high temperature and high pressure drops, even when, for example refueling the ship, it is possible to give the prospect of quality of the fuel in a simple .
[0006]
In the present invention, even if the combustion time is longer than a predetermined threshold, the amount of soot adhering to the holding member after the fire is extinguished can be observed, and the one with a small soot adhering amount can be determined to be acceptable.
Some good heavy oils that do not cause engine failure have long burn times. Such heavy oil has a small amount of soot generated during combustion in the first place, and does not produce substances that cause scuffing or the like. Thus, by observing not only the combustion time but also the amount of soot adhering, heavy oil can be selected within a wider range. It is considered that when the combustion time is short, the generated soot is burned in the combustion chamber of the engine. On the other hand, if the combustion time is long, soot is generated when the temperature of the combustion chamber starts to drop due to the expansion stroke of the engine piston, so that the generated soot is likely to remain without burning.
[0007]
In the present invention, the temperature of the high-temperature air atmosphere is preferably set to 1100K (± 10K). Heavy fuel oil C generally contains a distillation residue and light oil. These percentages vary from supplier to supplier. Since light oil has a low combustion temperature, if the temperature of the high-temperature air atmosphere is low, light oil will evaporate within the time until ignition. If the mixing ratio of the distillation residue and the diesel oil changes, the evaporation ratio of the diesel oil changes, and the components of the heavy oil during the combustion test change. This becomes a disturbance of the combustion time, and an accurate measurement cannot be performed. Therefore, by setting the temperature to 1100K, the time until ignition can be shortened even if the ratio of the constituents of heavy oil changes, and the components and weight of heavy oil can be maintained.
[0008]
In the present invention, it is preferable that the quantification of the droplet held by the holding member is within ± 1% as an average value of 10 times.
When the droplet is held at the tip of the hanging rod, the volume of the hanging rod in the droplet and the amount of the droplet at the time of ignition affect the burning process and the burning time. In order to reduce the influence of the hanging rod, the droplet amount may be increased, but when the droplet amount exceeds the limit value, the droplet falls from the hanging rod. For this reason, the precision of measurement can be improved by quantifying an appropriate amount of droplets within a range not falling from the hanging bar with good quantitativeness.
[0009]
A fuel oil testing device of the present invention is a device for testing whether heavy oil used as a fuel for a marine diesel engine generates soot that causes engine failure, and a quantitative mechanism for quantifying heavy oil; A holding member that holds the determined heavy oil as a droplet, a combustion chamber that burns the droplet held by the holding member, a unit that measures a burning time from ignition to extinguishing of the droplet, and the droplet. And an observation means for observing the combustion state.
[0010]
In the present invention, the burning time measuring means includes a phototransistor that detects a flame emitted from the burning flame of the droplet, an optical system that focuses the light on the phototransistor, and outputs a detection time of the phototransistor. And an electric circuit that performs the operation.
[0011]
In the present invention, the quantitative mechanism includes a micro syringe having a needle, a barrel, and a piston; a main body to which a barrel of the micro syringe is fixed; a plunger screwed into an inner surface of the main body to press the piston; A handle for rotating the plunger; and a stopper for restricting the rotation of the handle for each rotation. The plunger is advanced forward by one rotation of the handle, and the piston is always moved by a fixed amount. It is preferable to extrude and quantify.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, description will be made with reference to the drawings.
FIG. 1 is a diagram schematically showing an entire configuration of a fuel oil test device according to an embodiment of the present invention.
The fuel oil test apparatus 1 includes a quantification mechanism 10 for quantifying heavy oil, a hanging rod (holding member) 30 for holding the quantified heavy oil as droplets, and a combustion chamber 40 for burning the droplets held on the hanging rod. And a means 60 for measuring the combustion time and a means 80 for observing the combustion state.
[0013]
The suspension rod 30 extends horizontally from the tip of the upright rod 31, and extends downward at the tip. At the tip of the downwardly extending portion, the heavy oil F quantified by the quantifying mechanism 10 (described later in detail) is held as droplets. As the suspension rod 30, for example, a quartz rod having a diameter of 0.5 mm can be used.
[0014]
The combustion chamber 40 can use a small electric furnace for experiments or the like. A ceramic furnace tube (not shown) is placed in the combustion chamber 40 to prevent the influence of radiation from the heater. The outer diameter of the furnace tube is approximately equal to the inner diameter of the electric furnace. An opening 41 is formed on one side of the combustion chamber 40, and a window 43 is provided on the other side. The size of the opening 41 is the minimum size through which the droplet F at the tip of the suspension rod 30 can pass. In this example, the dimensions of the combustion chamber 40 are 80 mm in inner diameter and 200 mm in length.
Further, a moving mechanism 45 is provided in the combustion chamber 40 and is movable in the direction of the suspension rod 30 on a horizontal plane. The combustion test is performed with the droplet F at the tip of the suspension rod 30 positioned at the center of the combustion chamber 40. That is, after heating the combustion chamber 40 to a certain temperature, the droplet F at the tip of the suspension rod 30 is moved until it reaches the center of the same chamber 40. The movement of the combustion chamber 40 to the combustion test position is detected by the photo interrupter 47.
[0015]
A temperature sensor 49 is arranged in the combustion chamber 40 at a position 20 mm away from the center of the combustion chamber. The temperature in the combustion chamber is controlled by the controller 51 so that the temperature detected by the temperature sensor 49 becomes 1100K. It is assumed that there is no temperature difference between the temperature measurement position and the center position in the combustion chamber.
[0016]
Next, the quantitative mechanism 10 will be described.
FIG. 2 is a diagram schematically showing a quantitative mechanism used in the fuel test apparatus according to the present embodiment. FIG. 2 (A) is a plan view, FIG. 2 (B) is a side view, and FIG. 2 (C). Is a front view. In the drawings, the left side is referred to as the distal side or the front, and the right side is referred to as the proximal side or the rear.
The metering mechanism 10 includes a micro syringe 11, a main body 19 to which the micro syringe 11 is detachably attached, a plunger 21 moving in the main body 19, a handle 23 for rotating the plunger, and a stopper 25 for regulating the rotation of the handle 23. Is provided.
[0017]
The micro syringe 11 includes a needle 13, a barrel 15, and a piston 17. In one example, the volume of the barrel 15 is 100 μl. The inside diameter of the connection portion 14 between the needle 13 and the barrel 15 is 0.5 mm, which is larger than the inside diameter of the connection portion between the needle and the barrel in an existing microsyringe. By increasing the inner diameter, it can be applied to heavy oils having high viscosity and poor fluidity at room temperature.
[0018]
In the main body 19, the micro syringe 11 is arranged on the distal side (left side in the figure), and the plunger 21 is arranged coaxially on the proximal side (right side in the figure). A step 19 a for fixing the micro syringe is formed on the tip side of the main body 19. On the base end side, two female screws 22 with which the plunger 21 is screwed are arranged apart from each other in the longitudinal direction of the main body. In this example, the main body 19 is a square having a length of 180 mm and a sectional shape of 20 mm on a side.
[0019]
A flange 15a is formed at the base end of the barrel 15 of the micro syringe 11, and the barrel is immovably attached to the step 19a of the main body 19 with the flange 15a. The needle 13 of the micro syringe and the tip of the barrel 15 project from the front of the main body 19.
A male screw is cut on the outer surface of the plunger 21 and is screwed with the female screw 22 of the main body 19. When the plunger 21 is rotated with respect to the female screw 22, the plunger 21 moves in the main body 19 in the length direction. In one example, the stroke of the plunger 21 is 60 mm, and the feed amount per rotation is 1 mm. The distal end of the plunger 21 is in contact with a flange 17a at the base end of the piston of the micro syringe 11, and when the plunger 21 moves forward, the piston 17 is pushed forward, and heavy oil in the barrel is discharged from the needle 13 through the needle 13.
[0020]
A rear end of the plunger 21 is provided with a handle 23 projecting from a base end of the main body 19 and extending in a direction perpendicular to the longitudinal direction of the plunger. By rotating the handle 23, the plunger 21 advances or retreats in the main body 19. A stopper 25 is provided at the base end of the main body 19. The stopper 25 is slidable on one side of the inner surface of the main body in the longitudinal direction. The stopper 25 has a plate shape as shown in the figure, and a short handle engaging portion 27 having a short width is formed at the rear end. The stopper 25 slides between a position where the entirety is pulled into the main body 19 and a position where the locking portion 27 is pulled out from the base end of the main body 19. When the locking portion 27 is pulled out from the base end of the main body 19, the rotation of the handle 23 in the rotation direction when the plunger 21 advances is locked.
[0021]
The quantitative operation of the quantitative mechanism 10 will be described.
To determine the amount of heavy oil in the barrel, first, the stopper 25 is pulled backward from the main body 19, and the handle 23 of the plunger 21 is rotated in the plunger advancing direction. Hit the stop 27. The distal end of the plunger 21 is in contact with the proximal flange 17a of the piston of the syringe 11. This state is referred to as an initial state.
Next, the stopper 25 is pulled into the main body 19 so that the handle 23 can be rotated. Then, the handle 23 is rotated in the plunger traveling direction (indicated by the arrow in the figure). After the handle 23 has rotated approximately 230 ° (after the other side of the handle has passed the position of the stopper), the stopper 25 is pulled out. When the handle 23 rotates substantially once, the locking side of the handle 23 returns to the initial position, and is locked by the locking portion 27 of the stopper 25 that has been pulled out.
[0022]
With this mechanism, the rotation of the handle 23, that is, the rotation of the plunger 21, can be restricted to one rotation. Then, the moving distance of the piston 17 of the syringe 11 pushed by the plunger 21 can be regulated, and the amount of heavy oil poured out from the needle 13 can be determined. When the syringe barrel capacity, plunger stroke, and plunger rotation amount are the above-mentioned values, the amount of one injection is about 1.7 μl.
At the time of the combustion test, the droplets determined by the quantitative mechanism are attached to the tip of the suspension rod 30.
[0023]
Next, the combustion time measuring means 60 will be described.
FIG. 3 is a diagram schematically illustrating the combustion time measuring means.
The combustion time measuring means 60 is arranged outside the opening 41 of the combustion chamber during a combustion test. The burning time measuring means 60 includes an optical system 61 for condensing the flame during the burning of the droplet, and an electric circuit 71 (described later in detail) for detecting the light and measuring the burning time.
[0024]
The optical system 61 includes a half mirror 63, two lenses 65 and 67, and a phototransistor 69. The half mirror 63 is disposed just outside the opening 41 of the combustion chamber, and divides the light emitted from the combustion flame of the droplet into a flame for the optical system 61 and a video for the video camera 81. The lenses 65 and 67 and the phototransistor 69 are arranged on the optical axis of the flame detection light. The distance L (L1 + L2) between the upstream lens 65 and the droplet is equal to the focal length of the lens 65. Thus, the light emitted from the lens 65 becomes substantially parallel. The downstream lens 67 is provided so as to be movable in the optical axis direction, and can be set at any position. The phototransistor 69 is temporarily provided at the focal point of the lens 67 on the downstream side. By adjusting the position of each lens and the phototransistor so that the detection sensitivity of the phototransistor 69 is maximized, a minute flame can be detected with high sensitivity.
If there is a restriction on the arrangement position of the optical system 61, the lens 67 on the downstream side is moved or the angle of the half mirror 63 is adjusted to arrange each part at a position without restriction.
[0025]
The phototransistor 69 detects light emitted from the burning flame of the droplet. However, the phototransistor 69 detects not only the light from the flame but also the light under the atmosphere of the experiment (room light) and the light of the backlight 83 (detailed later) for photographing arranged behind the droplet. I will. In order to detect only the light from the flame, the phototransistor 69 is provided with an electric circuit including a comparator.
[0026]
FIG. 4 is a circuit diagram illustrating an example of an electric circuit.
This electric circuit 71 includes an operational amplifier 73. A reference voltage (for example, 5 V) is input to the input terminal 2 of the operational amplifier 73, and a ground voltage of the phototransistor 69 is input to the input terminal 3. When the phototransistor 69 detects light, its resistance decreases and the current increases, and as a result, the voltage of the input terminal 3 increases. While the voltage of the input terminal 3 is higher than the voltage of the input terminal 2, that is, one rectangular wave corresponding to the time when the flame is detected is output from the output terminal 6 of the operational amplifier 73. The combustion time can be measured by reading the width of this rectangular wave. A counter can be used to read the burn time. This output is also output to the light emitting diode 75 as a circuit monitor.
[0027]
At the time of measurement, first, the reference voltage of the input terminal 2 is adjusted. Here, the comparison state with respect to the combustion state is a state in which the backlight is turned on and the droplets are not combusted, usually under an experimental atmosphere. Then, the variable resistor 77 is adjusted so that the reference voltage of the input terminal 2 becomes slightly higher than the voltage of the input terminal 3 in the comparison state. By setting the voltage in this manner, the combustion time detected by the circuit 71 is measured slightly shorter than the actual combustion time, but the difference is negligible because it is 1 msec or less.
[0028]
Next, the combustion observation means 80 will be described with reference to FIG.
A video camera 81 is provided on the optical axis of light for photographing that has passed through the half mirror 63 (see FIG. 3). The number of frames shot by the video camera 81 is 60 frames per second. As described above, the backlight 83 for photographing droplets is provided outside the window 43 of the combustion chamber 40. The video camera 81 captures an image of the burning process of the droplet F and the state of adhesion of soot to the suspension rod 30. From these images, it can be confirmed whether the droplets are burning in a normal state. The output from the video camera 81 is input to the timer 85 and the VTR 87. The output from the photointerrupter 47 for controlling the movement of the combustion chamber 40 is also input to the timer 85. That is, when the combustion chamber 40 moves to the combustion start position (the position where the droplet F reaches the center of the combustion chamber 40), a signal is output from the photo interrupter 47. The timer 85 sets the time when the signal is received as the combustion start time, and starts counting the combustion time. The VTR 87 includes a monitor 89, and an image captured by a video camera is recorded by the VTR 87 and displayed on the monitor 89.
[0029]
A method of burning droplets in the fuel oil test device described above will be described.
First, the heavy oil to be tested, which is kept at 313 K to 325 K in a constant temperature water tank, is taken into the micro syringe 11. Next, the micro syringe 11 is attached to the main body 19 of the quantitative mechanism 10, and the handle 23 of the mechanism is set to an initial state. Then, the handle 23 is rotated once by the above-described method, and a predetermined amount of heavy oil is poured out from the needle tip of the micro syringe 11. Next, the needle tip is brought close to the tip of the hanging bar 30, and heavy oil is attached to the hanging bar 30 as a droplet. In this state, the droplet F stands still until the temperature of the droplet F reaches room temperature.
[0030]
Next, the combustion chamber 40 preheated to 1100K is moved in the droplet direction. The moving amount of the combustion chamber 40 is controlled by the photo interrupter 47 as described above. The droplet F is heated at the center of the combustion chamber 40 by the high-temperature air in the combustion chamber and the radiant heat from the inner wall, ignites and burns. Here, since the combustion temperature is 1100 K, even when the ratio of the constituent components of the heavy oil changes, the time until ignition can be shortened, and the initial components and weight of the heavy oil can be maintained.
[0031]
Hereinafter, the results of the test using the fuel oil test apparatus of the present invention will be described.
First, the types and properties of heavy oil used in the experiment will be described.
FIG. 5 is a table showing the types and properties of heavy oil used in the experiment.
Samples 1, 2, and 3 were empirically engine-free. Samples 4, 5, and 6 were engine failures empirically. Comparing the properties of these samples, it can be seen that there is no correlation between properties such as density, viscosity and metal content expected to be caused by soot generation and the presence or absence of engine failure.
[0032]
Droplet diameter First, heavy oil is quantified by a quantification mechanism, and is attached to the hanging rod 30 as a droplet. The droplet F is photographed by a video camera. From the photographed image, the minor axis and major axis of the droplet are measured, and the cube root of the minor axis multiplied by the square of the major axis is defined as the equivalent diameter do value of the droplet. Here, using the samples 2 to 6, an average value of do values quantified 12 times using the quantification mechanism 10 and a value obtained by dividing the do value by the average value were obtained.
[0033]
FIG. 6 is a table showing the equivalent diameter do value of the droplet of each sample.
As shown in the table, almost constant equivalent diameter can be obtained in all samples. Therefore, it can be said that the quantitative mechanism can obtain good quantitative properties (± 0.2%) even for heavy oils having different viscosities.
[0034]
Burning time Next, the result of the burning time measured by the burning time measuring means 60 is shown.
FIG. 7 is a table showing the burning time of each sample.
From this table, it can be seen from the table that Samples 1 and 2, which are empirically good, have a combustion time shorter than 1.7 seconds and shorter than the other Samples 3, 4, 5, and 6. From this result, a fuel whose combustion time is short (for example, shorter than 1.9 sec) measured by the fuel test apparatus 1 can be simply determined to be a good heavy oil. However, it can be said that, despite the fact that Sample 3 is a good heavy oil, the burning time is long, and the test result is insufficient only by determining the burning time. This will be described later.
[0035]
Droplet burning process Next, the droplet burning process and the behavior of soot will be described.
FIG. 8 is a diagram in which the burning process of the droplet (sample 1) is photographed by a video camera.
In the combustion test apparatus 1, the combustion process from the combustion start time was photographed by the video camera 81. The droplet ignites 0.89 sec after the combustion start time, burns violently thereafter, and extinguishes after 2.63 sec. In this example, the burning time is 1.74 sec. With the combustion, soot starts to adhere to the base side of the hanging rod 30 after 1.43 seconds. The soot grows with combustion and becomes the largest after 2.63 sec. Then, it oxidizes after combustion and gradually decreases, and disappears in about 8 seconds.
[0036]
Soot extinction time Next, the relationship between the soot extinction time and the temperature will be described.
FIG. 9 is a graph showing the relationship between the soot extinction time and the temperature. The horizontal axis of the figure shows the temperature, and the vertical axis shows the time when soot disappears from the end of combustion.
From this graph, it can be seen that the time until the soot disappears depends on the temperature, and the lower the temperature, the longer the time that the soot disappears. For example, when the temperature is 1000K or lower, the oxidation of soot hardly progresses. On the other hand, when the temperature is as high as around 1100 K, the soot disappears in a short time.
[0037]
The reason why the above-mentioned heavy oil having a short burning time is good can be estimated from this graph. In other words, if the combustion time is long, soot is emitted when the temperature of the combustion chamber starts to drop due to the expansion stroke of the engine piston, so that the soot remains without burning. In an actual engine, soot adheres to the inner wall of the engine, and the piston and inner wall are worn when the piston slides, causing various obstacles.
[0038]
On the other hand, if the combustion time is short, soot generated at the time of combustion is extinguished before the combustion chamber expands and the temperature drops, so that the soot does not cause any trouble.
[0039]
Next, the amount of soot deposited at the end of combustion will be described.
FIG. 10 is a diagram showing an image of soot at the end of combustion of each sample.
From these figures, it can be seen that Samples 1, 2, 4, 5, and 6 have a large amount of soot attached, while Sample 3 has a small amount of soot attached. From the above measurement results of the combustion time, it has been confirmed that Sample 3 is as long as heavy oil whose combustion time is not good. Nevertheless, it can be said that Sample 3 was a good heavy oil because the amount of soot attached was small. It is considered that such heavy oil originally generates a small amount of soot at the time of combustion, and does not generate a substance that causes scuffing or the like. In other words, it can be said that even if the burning time is long, the one with a small amount of soot attached is also a good heavy oil.
[0040]
When actually performing a fuel test, by measuring both the combustion time and observing the state of adhesion of soot, a good heavy oil can be selected without leakage.
[0041]
【The invention's effect】
As is clear from the above description, according to the present invention, the measurement of the burning time of heavy oil and the observation of the soot adhesion state are performed by a relatively simple method using one sample for one type of heavy oil. A test device capable of performing the test. Then, from the result of obtaining the combustion time and the amount of soot adhering using this test apparatus, it is possible to select a good heavy oil.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing an overall configuration of a fuel oil test device according to an embodiment of the present invention.
FIGS. 2A and 2B are diagrams schematically illustrating a quantitative mechanism used in the fuel test apparatus according to the present embodiment. FIG. 2A is a plan view, FIG. 2B is a side view, and FIG. Is a front view.
FIG. 3 is a diagram schematically illustrating a combustion time measuring unit.
FIG. 4 is a circuit diagram illustrating an example of an electric circuit.
FIG. 5 is a table showing types and properties of heavy oil used in the experiment.
FIG. 6 is a table showing an equivalent diameter do value of a droplet of each sample.
FIG. 7 is a table showing the burning time of each sample.
FIG. 8 is a view of a burning process of a droplet (sample 1) taken by a video camera.
FIG. 9 is a graph showing the relationship between soot extinction time and temperature.
FIG. 10 is a diagram showing an image of soot at the end of combustion of each sample.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fuel oil test apparatus 10 Quantitative mechanism 11 Micro syringe 13 Needle 14 Connection part 15 Barrel 17 Piston 19 Main body 21 Plunger 22 Female screw 23 Handle 25 Stopper 30 Hanging rod (holding member) 31 Rod 40 Combustion chamber 41 Opening 43 Window 45 Moving mechanism 47 Photointerrupter 49 Temperature sensor 51 Controller 60 Burning time measuring means 61 Optical system 63 Half mirror 65, 67 Lens 69 Phototransistor 71 Electric circuit 73 Operational amplifier 75 Light emitting diode 77 Variable resistance 80 Burning state observing means 81 Video camera 83 Backlight 85 Timer 87 VTR 89 monitor

Claims (7)

A method for testing whether heavy oil used as a fuel for a marine diesel engine generates soot that causes engine failure,
A predetermined amount of heavy oil is held by the holding member as droplets,
Introducing the holding member and the droplets into a high-temperature air atmosphere at a predetermined temperature,
Measure the burning time from the ignition of the droplet to the extinguishing,
A method for testing a fuel oil, comprising determining that the combustion time is shorter than a predetermined threshold value. The method according to claim 1, wherein even if the combustion time is longer than a predetermined threshold, the amount of soot adhering to the holding member after the fire is extinguished is observed, and one having a small amount of soot adhering is determined to be acceptable. Fuel oil testing method. The fuel oil test method according to claim 1 or 2, wherein the temperature of the high-temperature air atmosphere is 1100K (± 10K). 4. The fuel oil test method according to claim 1, wherein the quantitativeness of the droplets held by the holding member is within ± 1% in an average value of 10 times. A device for testing whether heavy oil used as a fuel for a marine diesel engine generates soot that causes engine failure,
A quantitative mechanism for determining heavy oil;
A holding member that holds the heavy oil determined by the determination mechanism as droplets,
A combustion chamber for burning droplets held by the holding member,
Means for measuring the burning time from the ignition of the droplet to the extinction,
Observation means for observing the burning state of the droplets,
A fuel oil test device comprising: The combustion time measuring means,
A phototransistor for detecting light emitted from the burning flame of the droplet,
An optical system for condensing the flame on the phototransistor,
An electric circuit that outputs a detection time of the phototransistor,
The fuel oil test device according to claim 5, comprising: The quantification mechanism,
Micro syringe with needle, barrel, piston,
A body to which a barrel of the micro syringe is fixed,
A plunger screwed into the inner surface of the main body and pushing the piston;
A handle for rotating the plunger,
A stopper for restricting rotation of the handle every rotation;
With
7. The fuel oil test apparatus according to claim 5, wherein the plunger is advanced forward by an amount corresponding to one rotation of the handle, and the piston is always pushed out by a fixed amount to determine the amount.

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