JP5580243B2 - Water contamination detection device and water contamination detection method - Google Patents

Description

  The present invention relates to a water contamination detection device and method, and more particularly to a water contamination detection device and method that can quickly and accurately detect whether water is mixed in hydrocarbon oil.

  Usually, in a refinery plant, crude oil is separated into boiling fractions by an atmospheric distillation unit. In general, crude oil contains water, and if there is a lot of water, a load is applied to the atmospheric distillation apparatus. Therefore, the moisture is removed in the previous stage of the atmospheric distillation apparatus. Therefore, it is important to detect moisture in the oil in order to efficiently remove moisture.

  As a method for detecting the mixing of water in hydrocarbon oil, for example, Patent Document 1 discloses a technique for detecting the presence or absence of mixing of water based on the measured frequency of oil. It has an oscillator that oscillates at a frequency corresponding to the capacitance between two electrodes arranged in an oil injection part into which oil has been injected, and a detection means that detects moisture in the oil based on the oscillation frequency from the oscillator. This is a device for detecting the amount of water in oil.

  However, in the apparatus of Patent Document 1, even when the target oil is deteriorated, the oscillation frequency changes in the same manner as when water is mixed, so that erroneous detection may occur, which is problematic in terms of measurement accuracy. was there.

JP-A-5-80015

  Regarding the above-mentioned problem of erroneous detection of water contamination, since the load on the atmospheric distillation apparatus increases and the economic efficiency deteriorates, improvement is particularly desired. However, since the above-described economic deterioration is caused, it is desired to detect the presence or absence of water in the piping at the tank entrance as quickly as possible.

  This invention is made | formed in view of this situation, Comprising: It is providing the apparatus and method which can detect rapidly and highly accurately whether the water is mixed in hydrocarbon oil.

  As a result of diligent research to achieve the above object, the inventors of the present invention measured the dielectric constant of hydrocarbon oil and detected the presence or absence of water based on the dielectric constant, thereby deteriorating the hydrocarbon oil. The present invention has been completed by finding that it can be detected with high accuracy and speed even when there is little water contamination.

That is, the method for producing a gasoline base material of the present invention is as follows.
(1) A dielectric constant measuring unit for measuring a dielectric constant of a hydrocarbon oil, a refractive index measuring unit for measuring a refractive index of the hydrocarbon oil, and a threshold value (ε _a ) set by the measured dielectric constant (ε). whether more than, and the dielectric constant ratio (ε / n ²⁾ is, the threshold ratio of dielectric constant and the setting for the square of the threshold of the refractive index is set against the square of the measured refractive index (n ²⁾ ( ε ^_a / _{n a} 2) greater than ^{_{(ε / n 2> ε a}} / n a 2) or in whether, characterized in that it comprises a data processing unit for detecting the contamination of water in the hydrocarbon oil Water contamination detection device.

( 2 ) The dielectric constant measuring unit is an impedance measuring unit that applies an AC voltage to the electrode immersed in the hydrocarbon oil and calculates a dielectric constant from the measured capacitance value. The water contamination detection device according to 1).

( 3 ) The water mixing detection device according to ( 2 ) above, wherein the application frequency of the AC voltage is in a range of 1 Hz to 1 kHz.

(4) A hydrocarbon oil measuring step for measuring the dielectric constant of the hydrocarbon oil, a refractive index measuring step for measuring the refractive index of the hydrocarbon oil, and a threshold value (ε _a ) set by the measured dielectric constant (ε ) whether more than, and the dielectric constant ratio (ε / n ²⁾ is, the threshold ratio of dielectric constant and the setting for the square of the threshold of the refractive index is set against the square of the measured refractive index (n ²⁾ (ε ^_a / _{n a} 2) greater than ^{_{(ε / n 2> ε a}} / n a 2) or not at either a; and a data processing step of detecting the entry of water in the hydrocarbon oil To detect water contamination.

  According to the present invention, it is possible to detect whether or not water is mixed in hydrocarbon oil with high accuracy regardless of the state of the hydrocarbon oil, as compared with the conventional apparatus. By constantly monitoring the characteristics, there is an extraordinary effect that water contamination can be detected quickly.

It is a flowchart for demonstrating the mixing detection apparatus of water by this invention. It is a figure for demonstrating the flow of the calculation by a data processing part, (a) shows the calculation using a dielectric constant, (b) shows the calculation using a dielectric constant and a refractive index. It is sectional drawing which showed typically one Embodiment of the impedance measurement part. It is sectional drawing which showed typically one Embodiment of the refractive index measurement part. It is the graph which showed the density | concentration of the water mixed in hydrocarbon oil, and the dielectric constant. It is the graph which showed the relationship between the density | concentration of the water mixed in hydrocarbon oil, and the ratio of the dielectric constant with respect to the double index of refractive index.

  Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows the flow of water mixing detection according to the present invention, and FIG. 2 shows the flow of calculation by the data processing unit. 3 and 4 schematically show cross sections of the impedance measurement unit and the refractive index measurement unit, respectively.

<Water contamination detection device>
The water contamination detection device according to the present invention includes an impedance measurement unit that measures the dielectric constant of hydrocarbon oil, and a data processing unit that detects water contamination depending on whether the measured dielectric constant exceeds a set threshold. It is characterized by providing.

  Since the dielectric constant of the hydrocarbon oil is more affected by the mixing of water than the influence of deterioration of the hydrocarbon oil, by grasping the dielectric constant of the hydrocarbon oil, Compared to the detection device, even when the hydrocarbon oil is deteriorated, it is possible to detect the mixing of water with high accuracy as in the case of normal hydrocarbon oil, and whether the dielectric constant exceeds the set threshold value. Therefore, quick detection is possible.

(Dielectric constant measurement part)
As shown in FIG. 1, the water contamination detection apparatus according to the present invention includes a dielectric constant measurement unit 10 that measures the dielectric constant of the hydrocarbon oil. When water is mixed in the hydrocarbon oil, the water has a large dielectric constant, so that the dielectric constant of the hydrocarbon oil is higher than before the water mixing. Therefore, in the apparatus according to the present invention, the dielectric constant can be used as an index for detecting water contamination.

  The configuration of the dielectric constant measuring unit is not particularly limited as long as the dielectric constant of the hydrocarbon oil can be measured or calculated with high accuracy. For example, by having a configuration for measuring and calculating impedance, dielectric constant, and tan δ, the dielectric constant of the hydrocarbon oil can be obtained.

In addition, the dielectric constant measuring unit is preferably an impedance measuring unit that applies an AC voltage to the electrode immersed in the hydrocarbon oil and calculates a dielectric constant from the measured capacitance value from the viewpoint of continuous measurement. .
As for the impedance measurement unit, for example, as shown in FIG. 3, the hydrocarbon oil 1 to be detected flows into the electrode unit 12 of the impedance measurement unit 10 through the pipe 2 and the dielectric constant is measured. As shown in FIG. 3, for example, the impedance measuring unit 10 includes an electrode unit 12 having an electrode 11 and an electric circuit unit 14 having an electric circuit 13 for applying an AC voltage to the electrode.

  The dielectric constant measured by the impedance measuring unit is transmitted to the data processing unit 20 via a signal cable (not shown). The hydrocarbon oil 1 to be detected that has passed through the impedance measuring unit 10 then flows into the refractive index measuring unit 30 through the pipe 2.

(Refractive index measurement part)
As shown in FIG. 1, the water contamination detection apparatus according to the present invention includes a refractive index measurement unit 30 that measures the refractive index of the hydrocarbon oil. When water is mixed, the refractive index changes slightly due to the change in properties of the hydrocarbon oil mixed with water. For example, when water is mixed, since the refractive index of water is lower than that of the hydrocarbon oil, the refractive index of the hydrocarbon oil mixed with water becomes slightly lower. Here, in the hydrocarbon oil having no orientation polarization, the square of the refractive index is the dielectric constant, and if there is a substance having the orientation polarization, the dielectric constant becomes larger than the square of the refractive index. Therefore, by dividing the dielectric constant by the square of the refractive index (normalizing), it is possible to correct the influence of subtle changes in the properties of hydrocarbon oil due to the difference in hydrocarbon oil and water contamination. The accuracy of the amount of mixed water becomes higher. Therefore, in the apparatus according to the present invention, the refractive index is used together with the dielectric constant as an index for detecting water contamination .

  In the refractive index measuring unit 30, as shown in FIG. 4, the detected hydrocarbon oil 1 is introduced from the impedance measuring unit 10, and the refractive index is measured by measuring the total reflection angle using the prism glass 31. Done. As shown in FIG. 4, for example, the refractive index measuring unit 30 includes a prism glass 31, a light source 32, a temperature control means 33, and a CCD 34.

(Data processing part)
As shown in FIG. 1, the water contamination detection apparatus according to the present invention includes a data processing unit 20 for detecting water contamination from the measured dielectric constant and refractive index.

In the data processing unit 20, as shown in FIG. 2A, when the dielectric constant ε measured by the impedance measuring unit 10 is larger than _a preset threshold value ε _a, it is determined that water has been mixed, On the other hand, when the measured dielectric constant ε is equal to or smaller than the threshold ε _a , a calculation 21 (first calculation) is performed to determine that no water is mixed.

Further, as shown in FIG. 2B, in the first calculation 21, when the dielectric constant ε measured by the impedance measuring unit 10 is larger than _a preset threshold value ε _a , the second refractive index is used. The operation proceeds to the operation 22 . In the second operation 22, the ratio of the dielectric constant with respect to the square of the refractive index n (ε / n ²⁾ is the relative squared threshold n _a refractive index dielectric constant ratio threshold (epsilon _{a /} n _a ² If it is larger than that, it is determined that water has been mixed, and an alarm is output from the data processing unit to the outside. On the other hand, wherein when the ratio of the dielectric constant with respect to the square of the refractive index n (ε / n ²⁾ is the dielectric constant of the ratio threshold (ε _{a /} n _{a ²⁾} or less with respect to the square of the threshold n _a refractive index Determine that there is no water contamination.

<Hydrocarbon oil>
The hydrocarbon oil to be detected by the apparatus of the present invention is not particularly limited as long as it is a hydrocarbon oil. For example, 10% by volume distillation temperature is 35-80 ° C, preferably 36-72 ° C, 95% by volume distillation temperature is 230-350 ° C, preferably 200-350 ° C, 97% by volume distillation temperature is 250-420. A hydrocarbon oil having a distillation property of ℃, preferably 250 to 400 ℃ can be used. Preferably, general crude oil and heavy hydrocarbon oil such as pyrolysis oil and catalytic cracking oil are used.

  As for the hydrocarbon oil, one kind of hydrocarbon oil can be used, or a plurality of hydrocarbon oils having different properties are mixed to obtain a hydrocarbon oil having the distillation property and sulfur content. Can also be used.

<Water>
The water to be detected by the apparatus of the present invention is water contained in the hydrocarbon oil, and is water that is turbid or dispersed in the hydrocarbon oil by an emulsion or the like. For example, the water | moisture content contained in general crude oil is mentioned.

<Water contamination detection method>
Next, the water contamination detection method according to the present invention will be described.
The water contamination detection method of the present invention includes an impedance measurement step for measuring the dielectric constant of a hydrocarbon oil, and a data processing step for detecting water contamination based on whether the measured dielectric constant exceeds a set threshold value. It is characterized by providing.

  By providing the above configuration, it is possible to detect the dielectric constant more accurately than the conventional detection of water based on the dielectric constant or specific gravity, etc., and whether the dielectric constant falls below the set threshold value. Therefore, quick detection is possible.

  In addition, the water contamination detection method according to the present invention further includes a refractive index measurement step for further measuring the refractive index of the hydrocarbon oil because the detection can be performed with higher accuracy, and the data processing step includes the dielectric constant. It is preferable to detect the mixing of water in the hydrocarbon oil based on whether or not the dielectric constant with respect to the measured refractive index exceeds the set threshold in addition to whether or not the value exceeds a set threshold.

  In addition, the place mentioned above only showed an example of embodiment of this invention, A various change can be added according to the description content of a claim.

Example 1
Dielectric constants were measured after adding various amounts (vol%) of water (distilled water) to the test hydrocarbon oil (dielectric constant: 2.77). The applied frequency of AC voltage was 100 kHz.
And the graph was created about the relationship between the mixing amount (vol%) of water and a dielectric constant (FIG. 5).

  From the results shown in FIG. 5, the hydrocarbon oil without water mixing has a dielectric constant of 2.77 or less, whereas when 1 vol% of water is mixed, the dielectric constant becomes 3.54, and further the water mixing amount is 5 vol%. The dielectric constant was 6.65, and it was found that the dielectric constant changed greatly depending on the amount of water mixed in.

(Example 2)
Dielectric constant ε and refractive index n are measured after adding various amounts (vol%) of water (distilled water) to test hydrocarbon oil (dielectric constant: 2.77, refractive index: 1.42). It was.
And the graph was created about the relationship between the mixing amount (vol%) of water and the ratio ((epsilon) / n < ² >) of the dielectric constant with respect to the square of a refractive index (FIG. 6).

From the result of FIG. 6, the ratio of the dielectric constant to the square of the refractive index (ε / n ² ) of the hydrocarbon oil in which water is not mixed is 1.37 or less, whereas 1 vol% of water is mixed. The ratio of the dielectric constant to the square (ε / n ² ) was 1.76, and the ratio of the dielectric constant to the square of the refractive index (ε / n ² ) was 3.32 when the mixed amount of water was 5 vol%.

From the results of Examples 1 and 2, the dielectric constant measured in the present invention correlates with the amount of water mixed and changes sharply and greatly, so whether or not water is mixed in the hydrocarbon oil. It is effective as an index for quickly and accurately judging. In addition, since the dielectric constant is more influenced by the mixing of water than the influence of deterioration of the hydrocarbon oil, regardless of the state of the hydrocarbon oil, the present invention determines whether or not water is mixed in the hydrocarbon oil. Can be detected. As a result, according to the present invention, mixing of water can be detected quickly by constantly monitoring the index using the dielectric constant and the dielectric constant relative to the refractive index of the hydrocarbon oil. If ε _a / n _a ² corresponding to the amount of contamination to be detected is set in advance, the moment of contamination can be accurately detected even with a small amount of contamination. For example, even a mixture of about 1 vol% can be detected.

  According to the present invention, whether or not water is mixed in the hydrocarbon oil can be detected quickly and with high accuracy regardless of the state of the hydrocarbon oil.

DESCRIPTION OF SYMBOLS 1 Hydrocarbon oil 2 Piping 10 Dielectric constant measurement part, impedance measurement part 11 Electrode 12 Electrode part 13 Electric circuit 14 Electric circuit part 20 Data processing part 21 First calculation 22 Second calculation 30 Refractive index measurement part 31 Prism glass 32 Light source 33 Temperature control means 34 CCD

Claims (4)

A dielectric constant measurement unit for measuring the dielectric constant of the hydrocarbon oil;
A refractive index measuring unit for measuring a refractive index of the hydrocarbon oil;
Measured dielectric constant (epsilon) whether more than a threshold value (epsilon _a) set, and the ratio of the dielectric constant for the square (n ²⁾ of the measured refractive index (ε / n ²⁾ is set refracted Water in the hydrocarbon oil whether or not the ratio (ε _a / n _a ² ) of the set dielectric constant threshold to the square of the rate threshold is exceeded (ε / n ² > ε _a / n _a ² ) And a data processing unit for detecting contamination of water.   2. The impedance measurement unit according to claim 1, wherein the dielectric constant measurement unit is an impedance measurement unit that applies an alternating voltage to an electrode immersed in the hydrocarbon oil and calculates a dielectric constant from a measured capacitance value. Water contamination detection device. 3. The water contamination detection apparatus according to claim 2 , wherein an application frequency of the AC voltage is in a range of 1 Hz to 1 kHz. A hydrocarbon oil measurement process for measuring the dielectric constant of the hydrocarbon oil;
A refractive index measuring step for measuring a refractive index of the hydrocarbon oil;
Measured dielectric constant (epsilon) whether more than a threshold value (epsilon _a) set, and the ratio of the dielectric constant for the square (n ²⁾ of the measured refractive index (ε / n ²⁾ is set refracted Water in the hydrocarbon oil whether or not the ratio (ε _a / n _a ² ) of the set dielectric constant threshold to the square of the rate threshold is exceeded (ε / n ² > ε _a / n _a ² ) And a data processing step for detecting contamination of water.

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