JPH0617904B2 - Method and apparatus for sludge analysis in fuel oil - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method and an apparatus for analyzing sludge in low-quality fuel oil quickly, simply and accurately.

[Conventional technology]

The method for quantitatively measuring sludge is not defined in standards such as ISO and CIMAC, and even the definition is not yet established. The only thing that is sometimes used in the field is Shell Petroleum's SHF (Shell Hot Filtration) method, and there is no simple one that can be automatically analyzed.

This SHF method, a heating container having a jacket for supplying hot water is placed on the upper side of a suctionable container, a filter paper is sandwiched between these containers, and sample oil is supplied onto this filter paper,
While pressurizing the upper container, suctioning the lower container, supplying hot water into the jacket, the residue remaining on the filter paper is dried and solidified, and this is weighed into sludge. is there.

[Problems to be Solved by the Invention]

When low-quality fuel oil is used, for example, in a marine engine, about 50% of troubles onboard the ship are caused by failure of the oil purifier or filter, and most of them are caused by sludge. Therefore, when the fuel oil tank is switched, it is necessary to appropriately change the amount of oil to be passed to the oil purifier or the filter, the sludge discharge interval, and the like to perform the pretreatment suitable for the fuel oil. Therefore, this sludge can be quickly
A simple quantification is required.

However, the above-mentioned SHF method requires special equipment such as a suction device and a pressurizing device, which is disadvantageous in that it takes too much labor and time.

The present invention has been made in view of the above points, and an annular filter paper is sandwiched between two transparent plates such as glass plates, and when sample oil is dropped inside the annular surface, the inner wall of the filter paper (side surface) It is an object of the present invention to provide a method and a device for simply determining sludge by utilizing the fact that only martens content is absorbed.

[Means for Solving the Problems]

In order to achieve the above object, the method for analyzing sludge in fuel oil according to the present invention is, as shown in FIGS. 1 to 5, a filter paper 2 having a constant thickness having a circular notch 1 at the center thereof. The low quality fuel oil or a liquid obtained by diluting the low quality fuel oil with a solvent at a constant ratio is dropped into the circular notch 1 by sandwiching it between the transparent plates 3 and 4, and the inside of the low quality fuel oil in the side wall of the filter paper 2 The sludge content in the fuel oil is estimated by measuring the area corresponding to the width b or the bottom of the sludge 5 remaining / accumulated at the end of the side surface of the paper after a certain period of time after absorbing the marten content or the solvent and the solvent. To do.

The sludge analyzer for fuel oil according to the present invention, as shown in FIG. 6, has a filter paper 2 having a circular notch 1 in the center.
And two transparent plates 3 and 4 for horizontally sandwiching this filter paper,
An area corresponding to the width b or the bottom surface of the sample oil dropping port 6 formed in the upper transparent plate 3 and the width b or the bottom surface of the sludge 5 which is provided in the vicinity of the side end of the filter paper and remains and accumulates on the side end of the filter paper is optically determined. It includes an optical measurement unit 7 for measurement and a calculation / output unit 8 connected to this optical measurement unit.

The optical measuring unit 7 includes, for example, the light emitting element 10 and the light receiving element 1.
1 and 1. The calculation / output unit 8 also has a display function. 12 is a sample oil injector, 13 is a pincer, 14 is a gel-like substance, and a is a contracted width after deposition.

[Operation] A circular cutout 1 is provided in the center, a filter paper 2 is sandwiched between two transparent plates 3 and 4, and sample oil is dripped into the circular cutout 1.
The sample oil reaches the inner wall of the filter paper, only martens are absorbed inside the filter paper 2, and sludge is accumulated along the inner wall of the filter paper.

After a lapse of a certain time after the end of the sample oil dropping, the martens contained in the accumulated sludge is gradually absorbed by the filter paper, so that the accumulated sludge is reduced, and as shown in FIG. 3 to FIG. , A gel substance 14 such as a resin component and the sludge 5 are separated.

Between the amount of sample oil injected and the amount of sludge, the
As shown in the figure, since there is a linear relationship, good reproducibility can be obtained by maintaining the sample oil injection amount at an appropriate constant amount.

The sludge amount can be estimated by measuring the black substance remaining / accumulated on the side edge of the filter paper after a certain period of time, that is, the width b of the sludge 5 or the area corresponding to the bottom surface of the sludge 5. For example, as shown in FIG. 6, the width or area of the sludge accumulated in the optical measuring unit 7 is read,
If the calculation / output unit 8 is configured to calculate the dilution ratio of the sample oil, the amount of the sample oil, the value of the sludge width or area, etc., the sludge content in the fuel oil can be automatically obtained.

FIG. 8 shows another example of the device of the present invention. In this example,
An oil absorbing cotton 20 is provided below the filter paper 2. 21
Is a holding table, 22 is a martens removal port and a suction port, 23 is a rubber plate, and 24 is a sample oil. It is a cleaning liquid inlet. Other configurations are the same as in the case of FIG.

〔Example〕

 Examples of the present invention will be described below.

Example 1 Sample oil 1 was prepared by mixing low-quality fuel oil with a known sludge content, toluene and n-heptane in a volume ratio of 1: 1: 10.
2.0 ml was made. Using the device shown in Fig. 1, sample oil 4.0
ml was dropped into a circular cutout portion of a filter paper made of Glass Senyo Toyo GA100, and after 10 minutes, an annular area of sludge at the edge of the filter paper (area corresponding to the bottom surface of the sludge) was measured. Similarly, the test was performed when the sample oil injection amounts were 0.5 ml, 1.0 ml, and 2.0 ml, and after 10 minutes, the annular area of the sludge at the edge of the filter paper was measured.

When this result was plotted, a graph as shown in FIG. 7 was obtained. From FIG. 7, it can be seen that there is a high correlation between the amount of sample oil injected and the sludge area.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

(1) The sludge can be observed in a wet condition without requiring special equipment such as a suction device and a pressurizing device in the conventional method, and the sludge can be measured quickly and simply. Therefore, the method of the present invention can significantly reduce the measurement time.

(2) The measurement accuracy is extremely high.

(3) If it is configured to read sludge deposited by an optical method, it can be easily automated.

[Brief description of drawings]

1 is a cross-sectional explanatory view showing an example of an apparatus for carrying out the method for analyzing sludge in fuel oil according to the present invention, FIG. 2 is a plan view of the same, and FIG. 3 shows a portion surrounded by a chain line in FIG. FIG. 4 is an enlarged view of a portion surrounded by a chain line circle in FIG. 3, FIG. 5 is a sectional view taken along the line AA in FIG. 4, and FIG. 6 is an apparatus of the present invention. And FIG. 7 is a graph showing the relationship between the sample oil injection amount and the sludge area 10 minutes after the sample oil injection, and FIG. 8 shows still another example of the device of the present invention. FIG. DESCRIPTION OF SYMBOLS 1 ... Circular notch part, 2 ... Filter paper, 3, 4 ... Transparent plate, 5 ... Sludge, 6 ... Sample oil dropping port, 7 ... Optical measuring part, 8 ... Calculation / output part, 10 ... Light emitting element, 11 ... Light receiving Element, 12 ... Sample oil injector, 13 ... Stopping scissors, 14 ... Gel-like substance, a
... Width of shrinkage part after deposition, b ... Width of sludge, 20 ... Oil absorbent cotton, 21 ... Holding base, 22 ... Martens removal port / suction port,
23 ... Rubber plate, 24 ... Sample oil / cleaning liquid inlet

Claims (2)

[Claims] 1. A circular notch (1) comprising a filter paper (2) having a constant thickness and a circular notch (1) in the center, sandwiched between two transparent plates (3, 4).
A low-quality fuel oil, or a liquid obtained by diluting the low-quality fuel oil with a solvent at a fixed ratio, is dropped in a fixed amount, and the marten component in the low-quality fuel oil or the martens component and the solvent are absorbed by the inner wall of the side surface of the filter paper (2). In the fuel oil, the sludge content in the fuel oil is estimated by measuring the width b or the area corresponding to the bottom surface of the sludge (5) remaining / accumulated on the side edge of the filter paper after a certain period of time. Sludge analysis method. 2. A filter paper (2) having a circular notch (1) in the center thereof.
And two transparent plates (3, 4) that horizontally hold this filter paper,
Equivalent to the width b or bottom of the sludge (5) that is left and accumulated on the side edge of the filter paper provided near the edge of the filter paper side and the sample oil dropping port (6) that is drilled in the upper transparent plate (3). An apparatus for sludge analysis in fuel oil, comprising: an optical measuring section (7) for optically measuring the area to be measured, and a calculation / output section (8) connected to the optical measuring section.