JP3134043B2 - Apparatus and method for measuring component ratio of fluid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for measuring the component ratio of a fluid flowing in a transport pipe, and more particularly to a method for measuring the component ratio of water, organic substances, and inorganic substances constituting a fluid such as sludge flowing in a transport pipe. The present invention relates to an apparatus and a method capable of measuring with high accuracy regardless of the presence or absence of contamination.

[0002]

2. Description of the Related Art The component volume ratio (hereinafter, the term "component ratio" or "content ratio" means "volume content") of a fluid composed of water, organic matter, and inorganic matter flowing in a transport pipe is generally used. Is measured by the neutron measurement method described below.

A description will be given by taking sludge as an example of a fluid flowing in a transport pipe. In addition to water and organic substances, sludge contains inorganic substances mainly composed of calcium and silicon. The inorganic substances have a small neutron absorption and scattering reaction cross section. Therefore, there is not much problem in neutron measurement as long as the inorganic content ratio does not change. Therefore, the inorganic substance content ratio can be obtained in advance by a sewage test method or the like using sludge collected from a transport pipe, and can be treated as a constant.

Since each of water and organic substances is a molecule containing a large amount of hydrogen, the respective component ratios can be obtained by a neutron measurement method. The neutron moderating power of hydrogen is much higher than other elements, so neutrons lose energy mainly by colliding with hydrogen atoms in the object to be measured, and finally heat with very low energy Become a neutron.

On the other hand, the number of hydrogen atoms per unit volume of water and organic matter, that is, the hydrogen density, is different. Therefore, if the volume content (content ratio) of water and organic matter in sludge fluctuates, neutron scattering occurs. Alternatively, the transmitted dose changes. Therefore, the neutron count rate (neutron count value / measurement time; cpm) for measuring the scattered or transmitted dose is measured,
Each volume content of water and organic substances can be determined by the following equation.

J / J ₀ = Tw + C · To (A) Tw + To = 1−Ta (B) where J ₀ is a neutron coefficient ratio (cpm) when the inside of the transport tube is filled with water, and J is a ratio of the neutron coefficient in the transport tube. Neutron coefficient ratio (cpm) when filled with sludge, Tw is the water volume content (content ratio) of sludge, To is the organic material volume content (content ratio) of sludge, Ta is the inorganic material volume content of sludge (content ratio) ) (Constant), and C represents the hydrogen density ratio of the organic substance to water.

However, if air bubbles are mixed in the sludge, the above equation (B) does not hold. That is, since the air bubble also has the relationship of the following equation (C) in consideration of the content ratio Tv of the air bubble in the sludge, which is one of the components of the sludge, a unique solution cannot be obtained, and measurement is basically impossible. Becomes

Tw + To + Tv = 1−Ta (C) Further, when heavy rain falls, mud (inorganic matter) flows into the sewer from the drainage ditch of the road, and the inorganic matter content ratio of the sludge rapidly increases. As a result, if the inorganic content ratio is treated as a constant, an error occurs in the component ratio measurement.

Japanese Patent Application Laid-Open No. 58-223039 discloses a method for solving measurement errors caused by air bubbles mixed into sludge. In this method, a positive displacement flowmeter and a mass flowmeter are connected in series in a slurry transport line, the flow rate of the slurry is measured by each flowmeter, and the flow value measured by the mass flowmeter is measured. The density of the slurry is calculated by dividing by the flow rate value measured by the positive displacement type flow meter.

[0010]

However, the conventional method does not determine the component ratio of sludge, and there is no mass flow meter for measuring the mass of a large-capacity and high-viscosity slurry. There is a problem that there is no.

It is an object of the present invention to reduce the volume content of water, organic matter, and inorganic matter to bubbles, not only for large-volume, low-viscosity slurry, but also for high-viscosity slurry and sludge containing a large amount of inorganic matter. An object of the present invention is to provide an apparatus and a method for measuring a component ratio of a fluid, which can be measured with high accuracy from outside a transport pipe regardless of presence or absence.

[0012]

According to the present invention, there is provided an apparatus for measuring a component ratio of a fluid, comprising: (a) a transport pipe through which the fluid flows; and (b) an optional transport pipe. (C) a first neutron source for irradiating neutrons from outside the pipe to a fluid flowing through the transport pipe at the measurement point A; d) a first neutron detector for detecting neutrons scattered by the fluid;
(E) a first neutron counting means for counting the counting rate of the detected scattered neutrons, and (f) a second manometer for detecting a fluid pressure at another arbitrary measurement point B remote from the measurement point A. ,
(G) a second neutron source for irradiating neutrons from outside the fluid flowing through the transport pipe at the measurement point B, and (h) a second neutron detection for detecting neutrons scattered by the fluid. (I) a second neutron counting means for counting the count rate of the detected scattered neutrons; and (j) a gamma ray source for irradiating the fluid flowing through the transport pipe at the measurement point A with gamma rays from outside the pipe. (K) a gamma ray detector for detecting gamma rays transmitted through the fluid; (l) gamma ray counting means for counting the count rate of the detected transmitted gamma rays; and (m) between the measurement points A and B. A flow meter that measures the flow velocity of the fluid at
(N) calculating means for determining at least one of the volume contents of water, organic matter, inorganic matter, and air bubbles contained in the fluid based on the obtained count rate, pressure, and flow rate. Features.

The method for measuring the component ratio of a fluid according to the present invention comprises:
(A) detecting a reference first fluid pressure P at an arbitrary measurement point A of the transport pipe; and (b) detecting a second fluid at an arbitrary measurement point B of the transport pipe away from the measurement point A. A step of detecting the pressure P ₀ , and (c) irradiating the fluid passing through the measurement point A with neutrons, detecting scattered neutrons, counting the neutrons, and calculating a first neutron count rate N to obtain a neutron count rate N. The measuring process,
(D) a flow velocity measuring step of measuring the flow velocity of the fluid between the measurement point A and the measurement point B, and (e) the flow velocity measurement step and the pipe length from the measurement point A to the measurement point B, Calculating the time at which the fluid passing the measurement point A reaches the measurement point B; and (f) irradiating the fluid passing the measurement point B with neutrons at this time to detect scattered neutrons. A neutron count rate measuring step of calculating the neutron count rate N ₀ by counting the neutron count rate N ₀ , and (g) determining the obtained neutron count rate N and a water-only sample in advance under the first fluid pressure P. the ratio of the neutron count rate from the neutron count rate N ₁ Metropolitan who was (N /
N ₁₎ is calculated, and the neutron count rate N ₀ obtained in advance second ratio of the fluid pressure P ₀ neutron count rate had been determined for a sample of only water under N _{1 0} Metropolitan neutron count rate from ( N
₀ / N _{1 0)} is calculated, and further, a step of calculating the ratio from the ratio of these neutron count rate _{(N 0 / N 1 0)} / (N / N 1), (h) obtained ratio ( _{N 0 / N 1 0) /} (N / N
A step of calculating using the following formula volume content Sv of bubbles fluids in under the conditions of the first pressure P based on the _{1), Sv = P 0 (} N 0 · N 1 -N · N 10 _{) / (N 0 · N 1} ·
P ₀ −N · N ₁₀ P).

In the present invention, the component ratio of a fluid is measured using two types of radiation (neutron rays and gamma rays). There are a scattering method and a transmission method as measurement methods based on the positional relationship between the radiation source, the fluid, and the detector. In the scattering method, the source and the detector are located in the same direction with respect to the fluid. The detector detects multiple rays of the radiation emitted from the source,
An object that has been turned by 80 degrees is detected. The transmission method is
The fluid is located between the source and the detector, and the detector detects the radiation emitted from the source that has passed through the fluid. In the present invention, neutrons are measured by a scattering method, and γ-rays are measured by a transmission method.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Methods for measuring the volume content of bubbles (content ratio), the volume content of organic substances, the volume content of water, and the volume content of inorganic substances using radiation will be described below with reference to FIG. FIG. 1 is a block diagram showing an apparatus for measuring a component ratio of a fluid according to a first embodiment of the present invention.

The transport pipe 2 is installed substantially horizontally. The sludge 1 flows through the transport pipe 2 from the measurement point A to the measurement point B at a predetermined flow rate. In addition,
The inner diameter is substantially uniform between the measurement point A and the measurement point B. A first neutron radiation source 3, a second neutron radiation source 4, and a gamma radiation source 5 are provided so as to face the outer peripheral surface of the transport tube 2 respectively. These sources 3, 4, and 5 are combined with detectors 6, 7, and 8, respectively.

The gamma ray source 5 and the gamma ray detector 8 were set at the measurement point A. The first neutron source 3 and the neutron detector 6 were also set at the measurement point A. The second neutron source 4 and the neutron detector 7 were installed at the measurement point B.

A current meter 9 is provided between the measurement points A and B,
The flow rate of the sludge 1 flowing in the transport pipe 2 is measured. The first pressure gauge 10 is provided on the measurement point A side, and the second pressure gauge 11 is provided on the measurement point B side. Counters 18, 19, 20, current meter 9, and pressure gauges 10, 11
Are connected to the input unit of the arithmetic processing unit 21. A predetermined mathematical expression and necessary data are stored in the memory of the arithmetic processing unit 21, and when the detection data is input, the built-in CPU calls the required mathematical expression and executes the arithmetic.

At the measurement point A, when fast neutrons are radiated from the outside of the tube to the sludge 1 from the first neutron source 3, they are scattered by the sludge 1 to form thermal neutrons, and the first neutron detector 6
Is detected by The output signal of the first neutron detector 6 is amplified by the preamplifier 12 and counted by the counter 18 after the noise signal is removed by the wave height discriminator 15.

At the measurement point A, among the γ rays emitted from the gamma ray source 5, the γ rays transmitted through the sludge 1 are detected by the gamma ray detector 8. The output signal of the gamma ray detector 8 is amplified by the preamplifier 13 and
Is counted by the counter 19 after removing the noise signal.

Next, when the sludge 1 is irradiated with fast neutrons from the outside of the tube at the measurement point B from the second neutron source 4, the sludge 1 multiplexes the sludge 1 to form thermal neutrons, which are detected by the second neutron detector 7. You. The output signal of the second neutron detector 7 is amplified by the preamplifier 14, and is counted by the counter 20 after the noise signal is removed by the wave height discriminator 17.
However, at the measurement point B, the sludge 1 measured at the measurement point A obtained from the flow velocity measured by the current meter and the pipe length L is measured at the measurement point B.
The measurement of the pressure and the neutron count rate is performed in synchronization with the time of passing through.

Finally, the first pressure gauge 10 and the second pressure gauge 1
1. Each measurement result of the counters 18, 19, 20 is subjected to arithmetic processing by the arithmetic processing unit 21 to obtain the component ratio of the sludge 1. In the apparatus having the above configuration, sludge 1 is obtained by using ²⁵² Cf (radio isotope) for the first neutron source 3 and the second neutron source 4 and ¹³⁷ Cs (radio isotope) for the gamma ray source 5. An example of measuring each component ratio at the measurement point A will be described.

[Measurement of Bubble Volume Content (Content Ratio)] The bubble volume content is measured by neutron measurement by a scattering method.
Fast neutrons with high energy emitted from the first neutron source 3 are scattered by the sludge 1 and gradually lose energy. Since the moderating power for neutrons is much higher than hydrogen by other elements, neutrons lose energy by colliding mainly with water in the sludge 1 and hydrogen atoms constituting organic matter, and eventually lose energy. Becomes thermal neutrons with very low energy. First neutron detector 6 ( ³ He
Since the detection efficiency of the counter tube is high for thermal neutrons and low for fast neutrons, the neutron count rate (= neutron count value / measurement time; cpm) is the water and organic matter volume content in the sludge 1 after all. The amount reflects the The number of hydrogen atoms Nt (pieces) contained in the sludge 1 within the measurement effective range volume Ve ₁ (cm ³ ) of the first neutron detector 6 and the neutron counting rate of the measuring device 18 measured by the first neutron detector 6 Since a proportional relationship is established with N (cpm), N = K ₁ Nt (1) where K ₁ represents a proportionality constant (cpm / number).

The effective range volume V of the first neutron detector 6
In e ₁ , the first pressure P (atm) (reference pressure)
The volume of each of the bubbles, water, organic substances, and inorganic substances under the conditions of
(Cm ³ ), Vw (cm ³ ), Vo (cm ³ ), Va
(Cm ³ ), Vv + Vw + Vo + Va = Ve _{1 If} both sides are divided by Ve ₁ , bubbles under the condition of the first pressure P,
Each volume content Sv, Sw, So, of water, organic matter, inorganic matter,
The following equation (2) is obtained as the relational expression of Sa.

Sv + Sw + So + Sa = 1 (2) Further, since the volumes of water, organic substances, and inorganic substances are almost constant irrespective of the pressure, the following relationship is maintained during the measurement.

Vo = mVw (0 ≦ m <1) (3) Va = nVw (0 ≦ n <1) (4) where m and n are constants, and the main component of the sludge 1 is generally Since it is water, it may be assumed as in the above equation. By substituting the two sides of Equations (3) and (4) by Ve into Equation (2), if Sv + (1 + m + n) Sw = 1 m + n = k (constant), then Sv + (1 + k) Sw = 1 (5)

Since the sludge component containing a large amount of hydrogen is water and organic matter, if the number of hydrogen atoms contained in the water and organic matter contained in the volume Ve ₁ is Nw (number) and No (number), respectively, N
t is expressed as Nt = Nw + No. Here, the hydrogen density is defined. Hydrogen atom density of water (pieces / cm ³⁾ and Dw, the organic hydrogen atom density (number / cm ³⁾ and Do, Dw = Hw [ρwNa / Mw] ... (6) Do = Ho [ρoNa / Mo ] (7), Nw and No are respectively Nw = Hw [ρwNa / Mw] (Ve ₁ Sw) No = Ho [ρoNa / Mo] (Ve ₁ So) In the above formula, Hw: the number of hydrogen atoms contained in one molecule of water, Ho: the number of hydrogen atoms contained in one molecule of an organic substance,
ρw: density of water (g / cm ³ ), ρo: density of organic matter (g / cm ³ ), Na: Avogadro number (pieces / mol),
Mw: molecular weight of water, Mo: molecular weight of organic matter. The numbers on the right side of the formulas (6) and (7) indicate the number of molecules of water and organic substances contained in the unit volume, and by multiplying this by Hw and Ho, the hydrogen density of water and organic substances can be obtained.

The number of hydrogen atoms Nt in volume Ve therefore Nt = Nw + No = Hw [ ρwNa / Mw] (Ve 1 Sw) + Ho [ρoNa / Mo] (Ve 1 So) = (NaVe 1 / MwMo) (HwρwSwMo + HoρoSoMw) = (NaVe ₁ / MwMo) (HwρwMo + mHoρoMw) Sw (from equation (3)). At this time, the neutron counting rate N is calculated by the above equation (1).
Thus, N = K ₁ Nt = K ₁ (NaVe ₁ / MwMo) (HwρwMo + mHoρoMw) Sw.

Next, the pressure and the neutron count rate are measured at the measurement point B in FIG. Sludge pressure loss occurs between pumped transport tube because of the high viscosity, the pipe pressure at the measurement point A and measurement point B in the pressure conditions are different for the measurement point B P ₀
(Atm). From the pipe length between the measurement point A and the measurement point B and the flow velocity of the fluid measured by the current meter, in synchronization with the sludge 1 measured at the measurement point A reaching the measurement point B,
Measure pressure and neutron count rate.

Incidentally, the measurement effective range volume and detection efficiency of the first neutron detector 6 and the second neutron detector 7 generally differ depending on individual differences. Therefore, the second
The effective measurement range volume of the neutron detector 7 is Ve ₂ (cm ³ )
Is defined. Since the measurement effective range volume has changed, each volume content in Ve ₂ in the state of the pressure P is first determined using the following equation. It can be assumed that the following relationship holds between Ve ₂ and Ve ₁ . Here, the coefficient q in the equation represents a non-zero constant.

Ve ₂ = qVe ₁ Therefore, each volume Vv _{2 of} bubbles, water, organic matter and inorganic matter,
The following relations also hold for Vw ₂ , Vo ₂ , and Va ₂ .

Vv ₂ = qVv Vw ₂ = qVw Vo ₂ = qVo Va ₂ = qVa Ve ₂ = Vv ₂ + Vw ₂ + Vo ₂ + Va ₂ Therefore, at this time, the respective volume contents Sv ₂ of bubbles, water, organic matter, and inorganic matter, The following equation holds for Sw ₂ , So ₂ , and Sa ₂ , and under the same pressure conditions, the second neutron detector 7
Is the same as the volume content measured by the first neutron detector 6.

Sv ₂ = Vv ₂ / Ve ₂ = qVv / (qVe ₁ ) = Sv Sw ₂ = Sw So ₂ = So Sa ₂ = Sa Sv ₂ + Sw ₂ + So ₂ + Sa ₂ = 1 Next, at the measurement point B Bubbles at pressure P ₀ which is a measurement condition,
Each volume content Sv ₀ , Sw ₀ , S of water, organic matter and inorganic matter
o ₀ and Sa ₀ are obtained. If the bubble volume at the measurement point B under the condition of the pipe pressure P ₀ is Vv ₀ (cm ³ ), the following equation (8) is established from Boyle's law.

Vv ₀ = VvP / P ₀ (8) Since P ₀ <P, Vv ₀ > Vv, and the volume of the bubble increases in the volume Ve ₂ according to the relationship of the above equation (8), and the increase is as follows. However, the volume of water, organic matter, and inorganic matter occupying the volume Ve ₂ is reduced while maintaining the relations of the above equations (3) and (4).

Therefore, the following equation (9) is obtained from the equation (8). Sv ₀ = Vv ₀ / Ve ₂ = (P / P ₀ ) (Vv ₂ / Ve ₂ ) = (P / P ₀ ) Sv (9) As described above, under the condition of the pressure P ₀ , water, organic substances, and inorganic substances volume content of are also respectively changed to _{Sw 0, so 0, Sa 0} , similarly to the above equation _{(2) Sv 0 + Sw 0} + so 0 + Sa 0 = 1 and can be represented, as in equation (5) It is expressed as in the following equation (10).

Sv ₀ + (1 + k) Sw ₀ = 1 (10) If k is eliminated from equations (5) and (10), and Sv ₀ is eliminated using equation (9), the following equation (11) is obtained. Get)

Sw ₀ / Sw = (P ₀ −PSv) / [P ₀ (1−Sv)] (11) At this time, the number of hydrogen atoms Nt ₀ (pieces) contained in the volume Ve ₂ is Nt ₀ = (NaVe ₂ / MwMo) (HwρwMo + mHoρoMw) Sw ₀ = q (NaVe ₁ / MwMo) (HwρwMo + mHoρoMw) Sw ₀
Therefore, the neutron count rate N ₀ (cpm) under the condition of the second pressure P ₀ is given by the following equation from the equation (1). N ₀ = K ₂ Nt ₀ = K ₂ (NaVe ₂ / MwMo) (HwρwMo + mHoρoMw) Sw ₀ = qK ₂ (NaVe ₁ / MwMo) (HwρwMo + mHoρoMw) Sw ₀ where the first neutron detector 6 and the second neutron are used. Are different from each other in the detection efficiency and the like as described above, and because the radioactivity of the first neutron source 3 and the second neutron source 4 are not the same,
Generally coefficient K is not equal to the coefficient K _2. Therefore, when comparing N and N ₀ , it is necessary to correct this individual difference.

Therefore, the state where the pipe is filled with water (Sw =
At Sw ₀ = 1), the neutron counting rate is measured at each of the measurement points A and B by the first neutron detector 6 and the second neutron detector 7, respectively. If the measured neutron counting rate and N _1, N _{1 0,} the following equation of the relationship between per N ₁ is satisfied.

[0039] _{N 1 = K 1 Nw = K} 1 HwρwNaVe 1 Sw / Mw = K 1 HwρwNaVe 1 / Mw similar to the relationship of the following expression holds per N _{1 0.}

[0040] _{N 1 0 = K 2 Nw =} K 2 HwρwNaVe 2 Sw 0 / Mw = K 2 HwρwNaVe 2 / Mw = qK 2 HwρwNaVe 1 / Mw these N _1, N _{1 0} In the above N, dividing the N ₀ Then, N / N ₁ = (HwρwMo + mHoρoMw) Sw /
_{[HwρwMo] N 0 / N 1} 0 = (HwρwMo + mHoρoMw) Sw
₀ / [HwwMo] As is apparent from these equations, N / N ₁ and N ₀ / N _{1
From 0,} constants K ₁ , K ₂ , Ve ₁ , Ve ₂ specific to the detector
Disappeared, resulting in an amount dependent only on the water content ratio. Taking the ratio of the two from the relation of formula _{(11) [N 0 / N} 1 0] / [N / N 1] = Sw 0 / Sw = (P 0 -PSv) / [P 0 (1-Sv)] This is deformed to obtain the bubble volume content Sv under the condition of the first pressure P by the following equation (12).

[0041] _{Sv = P 0 (N 0 ·} N 1 -N · N 1 0) / (N 0 · N 1 · P 0 -N · N 1 0 · P) ... (12) under the conditions of the first pressure P To obtain the cell volume content Sv at Note that the bubble volume content Sv ₀ under the condition of the second pressure P ₀ is Sv ₀ = SvP / P ₀ from the equation (8).

As described above, the neutron count rate N under the condition of the first pressure P and the neutron count rate N under the condition of the second pressure P _0
0, and the first pressure P, by measuring the second pressure P _0, the bubble volume content Sv ₀ under conditions of the bubble volume fraction Sv and second pressure P ₀ at the conditions of the first pressure P Was required. [Measurement of volume content of organic matter, water and inorganic matter] FIGS. 2 and 3
The procedure for obtaining each of Sw, So, and Sa based on the measurement results of the neutron count rate and the γ-ray count rate will be described with reference to FIG.

The volume content of each component of the sludge 1 under the condition of the first pressure P is set as in the following equation (2) in the same manner as in the measurement of the bubble volume content. Sv + Sw + So + Sa = 1 (2) First, the neutron count rate (cpm) is proportional to the number of hydrogen atoms contained in the sludge. Therefore, the components of the sludge to be considered are water containing a large amount of hydrogen and organic matter. Therefore, in the above equation (2), if SH = Sw + So and SSw = Sw / SH SSo = So / SH, the following relational expression is obtained. Note that SSw
Represents the mixing ratio of water based on the (water + organic material) portion in the sludge, and SSo represents the mixing ratio of the organic material based on the (water + organic material) portion in the sludge.

SSw + SSo = 1 FIG. 2 is a conceptual diagram for explaining the neutron counting rate. Hereinafter, neutron measurement on the modeled samples A, B1, B2, and B3 will be considered with reference to this conceptual diagram, and a neutron count rate for each sample will be defined to derive an equation representing the water volume content. However, the pressure condition is the first in any measurement.
Let the pressure be P.

Sample A) Water (Sw = 1): N ₁ (cpm) Sample B1) Sludge (0 <SSw <1, 0 <SSo <
1): N ₂ (= N) (cpm) Sample B2) Organic substance + inorganic substance + bubble (SSo =
1): N ₃ (cpm) Sample B3) Water + inorganic substance + bubble (SSw = 1): N
₄ (cpm) The neutron count rate N ₂ described above is equal to N measured in the measurement of the bubble volume content.

From the above equations (6) and (7), Do / Dw = ρoHoMw / (ρwHwMo). Since N ₃ and N ₄ measure the same volume of organic matter and water, the relationship between the two is expressed by the hydrogen density ratio Do / Dw as in the following equation (13).

N ₃ = [ρoHoMw / (ρwHwMo)] N ₄ (13) Further, the neutron count rates N ₁ and N ₄ have the relationship of the following expression (14) due to the difference in the volume ratio of water.

N ₄ = (1−Sv−Sa) N ₁ (14) Next, referring to FIG. 3, mixing of water and an organic substance in the (water + organic substance) portion in the sample B1 from the neutron counting rate N _2. The fact that the ratio [SSw (or SSo)] is determined will be described.

FIG. 3 shows the mixing ratio [SSw (or SSo)] of water and organic matter in the (water + organic matter) portion of sample B1 on the horizontal axis, and the neutron count rate on the vertical axis. FIG. 4 is a characteristic diagram showing the dependence of the neutron counting rate on the mixing ratio of the neutrons. Now, since SSw has changed from 0 to 1 and the neutron count rate has changed from N ₃ to N ₄ , N ₂ of sample B1 is expressed as follows.

N ₂ = N ₃ + (N ₄ −N ₃ ) SSw = N ₃ + (N ₄ −N ₃ ) [Sw / SH] = N ₃ + (N ₄ −N ₃ ) [Sw / (Sw + So) _{] = N 3 + (N 4} -N 3) obtain [Sw / (1-Sv- Sa)] following equation solving for Sw (15).

Sw = [(N ₂ −N ₃ ) / (N ₄ −N ₃ )] (1−Sv−Sa) = (ρwHwMoN ₂ −ρoHoMwN ₄ ) (1−Sv−Sa) / [(ρwHwMo−ρoHoMw) ) N ₄ ] (from equation (13)) = [ρwHwMoN ₂ −ρoHoMw (1-Sv-Sa) N ₁ ] / [(ρwHwMo−ρoHoMw) N ₁ ] (from equation (14)) (15) From equation (2), 1−Sv−Sa = Sw + So. Therefore, substituting this into equation (15) and rearranging Sw allows the following modification.

Sw = [ρwHwMo (N ₂ / N ₁ ) −ρoHoMwSo] / (ρwHwMo) (15-1) As described above, N ₂ is N measured by the bubble volume content measurement.
Therefore, the following relational expression is eventually obtained.

Sw = [ρwHwMo (N / N ₁ ) −ρoHoMwSo] / (ρwHwMo) (15-2) By the way, the γ-ray counting rate (= γ) measured by the γ-ray measurement system
The meaning of (line count value / measurement time) is as follows. Generally, the γ-rays emitted from the γ-ray source 5 are scattered by the sample and change direction, so that the transmitted γ-ray intensity I (= γ-ray count rates G ₁ , G ₂ ) (cp
m) is represented by the following equation (16).

I = B · G · exp (−μρt) (16) where G: sample incident γ-ray intensity (cpm) μ: mass attenuation coefficient (cm ² / g) ρ: average density of sample (g / g) cm ³ ) t: transmission path length (cm) B: build-up coefficient G is a constant defined by the radioactivity of the γ-ray source. The interaction between γ-rays and substances that attenuate incident γ-rays includes photoelectric effect, Compton scattering, and electron pair generation, and their reaction cross section (probability of interaction) depends on the energy of the substance and incident γ-rays. I do.

When Compton scattering is the main loss process, Compton scattering is the main energy loss process in the present measuring method because the mass attenuation coefficient μ in equation (16) is almost constant regardless of the element. A gamma ray having such energy is used.

Further, since there is no deformation of the transport pipe 2 through which the sludge 1 flows in the direction of the γ-ray transmission path, t is constant, and the transmission γ-ray count rate detected by the γ-ray detector 8 is the density of the sludge in the transmission path. The amount depends on ρ. That is, by measuring the transmitted γ-ray intensity I, the average density of the sludge 1 can be known. Since γ-rays emitted from a γ-ray source do not always have good directivity, an event occurs in which scattered γ-rays enter the γ-ray detector 8. The apparent increase of the transmitted γ-ray intensity I is corrected by the build-up coefficient B.

Incidentally, the sludge 1 under the condition of the first pressure P
Is in the relationship of the following equation (2). Sv + Sw + So + Sa = 1 (2) Now, γ-ray measurement under the condition of the first pressure P is considered.

The thickness of one side of the sludge transport pipe is defined as h (cm), and the γ-ray transmission length in the sludge 1 is defined as X (cm). For each mass attenuation coefficient, air was μv (cm ² / g),
Water is μw (cm ² / g) and organic matter is μo (cm ² / g).
g), the inorganic substance is μa (cm ² / g), the transport pipe wall is μs
(Cm ² / g). For each density, air is ρv (g / cm ³ ) and water is ρw (g / cm ³ ).
³ ), the organic matter is ρo (g / cm ³ ), and the inorganic matter is ρa (g / cm ³ ).
/ Cm ³ ), and the transport pipe wall is ρs (g / cm ³ ). Further, assuming that the number of incident γ-rays into the transport pipe 2 is G (cpm) and the number of transmitted γ-rays when the sample is sludge 1 is G ₂ (cpm),
From the relationship of the equation (16), G ₂ = B · G · exp ｛−μvρvSvX｝ · exp ｛−μwρwSwX｝ · exp ｛-μopoS
oX｝ · exp ｛-μaρSaX｝ · exp ｛-μsρs2
h｝ Also, when the inside of the transport pipe 2 is only air (that is, empty state)
G ₁ (cpm) of the transmission gamma ray of the following equation is given by: G ₁ = BGＢexpｅｘ-μvρvX ・ exp ｛-μs
ρs2h｝.

From these, G ₂ / G ₁ = exp ｛−μvρv (Sv−1) X｝ · exp ｛−μwρwSwX｝ · exp ｛−μoρoSoX｝ · exp ｛−μaρaSaX｝ where the mass attenuation coefficient is independent of the substance Since it is almost constant, μ (cm ² / g) = μv = μw = μo = μa By substituting this relationship and taking the natural logarithm, ln (G ₂ / G ₁ ) = − μρv (Sv−1) X−μρwSwX−μρSoSoX−μρaSaX = −μX [ρv (Sv−1) −ρwSw−ρoSo−ρaSa] This is further transformed to ρvSv + ρwSw + ρoSo + ρaSa = [ln (G
₂ / G ₁ )] / (μX) + (2Sv−1) ρv Therefore, the average density ρ (g / cm ³ ) of the sludge is given by the following equation (1)
7).

ΡvSv + ρwSw + ρoSo + paSa = ρ (17) Accordingly, the average density ρ is obtained as in the following equation (18). ρ = [ln (G ₂ / G ₁ )] / (μX) + (2Sv−1) ρv (18) By the way, the following relational expression is established from the above description.

Sw = [ρwHwMo (N / N ₁ ) −ρoHoMwSo] / (ρwHwMo) (15-2) Sa = 1− (Sv + Sw + So) (from equation (2)) (19) ρ = ρvSv + ρwSw + ρoSo + ρaSa By substituting the equations (15-2) and (19) into the equation (17) and solving for So, the following equation (20) is obtained.

So = ρwHwMo [ρ−ρa + (ρa−ρv) Sv + (ρa−ρw) (N / N ₁ )] / [(ρo−ρa) ρwHwMo + (ρa−ρw) ρoHoMw] (20) Sw is obtained from equation (15-2) using the obtained So. Further, since So and Sw have been solved, Sa can also be solved. Thus, So, Sw, and Sa can all be determined.

In the above description, the first pressure P is assumed as the pressure condition, and the sludge component ratios So, Sw, and Sa at the first pressure P are obtained. Similarly, assuming that the pressure condition is the second pressure P ₀ , the respective volume contents So ₀ , Sw ₀ , and Sa ₀ of the sludge component at the second pressure P ₀ can be obtained. In this case, in the description for obtaining So, Sw, and Sa, the first pressure P is set to the second pressure P ₀ ,
Sv is Sv ₀ , So is So ₀ , Sw is Sw ₀ , S
a may be replaced with Sa ₀ and N may be replaced with N ₀ .

In the method described above, the first method is used.
From the measured values under the condition of the pressure P and the condition of the second pressure P ₀ , the volume content S of each component of the sludge under the condition of the first pressure P is calculated.
v, Sw, So, and Sa were determined. However, it is also possible to from each volume content of under the conditions of the first pressure P by the following equation to determine the volume content of each component of the sludge under any pressure P _{0 0.} It bubbles under a pressure P _{0 0,} water, organic matter, Sv _{0 0} each volume content of inorganic matter, Sw _{0 0,} So.
_{0 0,} and Sa _{0 0.}

[0065] First, the bubble volume content Sv _{0 0} formula (8)
The following equation (21) is established from the relationship. _{Sv 0 0 = SvP / P 0} 0 ... (21) under a first pressure P Equation (3) and (4) from Vw + Vo + Va = (1 + m + n) by dividing both sides of the above equation in Ve ₁ Vw following equation (22 ).

[0066] Sw + So + Sa = (1 + m + n) Sw ... (22) in the pressure P _{0 0 Similarly, Vw 0 0 + Vo 0 0} + Va 0 0 = (1 + m + n) Vw 0
₀ Therefore, the following equation (23) is established.

Sw _{0 0} + So _{0 0} + Sa _{0 0} = (1 + m + n) Sw _{0 0} (23) Therefore, Sw _{0 0} / Sw is obtained from Expression (22) and Expression (23). Sw _{0 0} / Sw = erases Sv _{0 0} using _{(Sw 0 0 + So 0 0} + Sa 0 0) / (Sw + So + Sa) = (1-Sv 0 0) / (1-Sv) equation (21), further Sw _{0 0}
Is solved, the following equation (24) is obtained.

[0068] _{Sw 0 0 = Sw (P 0} 0 -PSv) / [P 0 0 (1-Sv)] ... (24) Similarly organics volume content So. _{0 0} also given by the following equation (25).

So _{0 0} = So (P _{0 0} -PSv) / [P _{0 0} (1 -Sv)] (25) Eventually, the inorganic volume content Sa _{0 0} is obtained as in the following equation (26).

[0070] _{Sa 0 0 = 1-Sv 0} 0 -Sw 0 0 -So 0 0 ... (26) under the conditions of any pressure P _{0 0} from each volume content under the conditions of the thus first pressure P Can be obtained for each volume content.

[0071] obtained in the same manner a second pressure P each volume content Sv ₀ sludge under conditions of _{0, Sw 0, So 0,} Sa 0, under conditions of any pressure P _{0 0} Using this Each component ratio Sv
_{0 0} , Sw _{0 0} , So _{0 0} , and Sa _{0 0} can also be obtained. In this case, equations (21), (24), and (25)
, P is P ₀ , Sv is Sv ₀ , and Sw is Sw
₀ and So may be read as So ₀ , respectively.

As described above, the pressure, the neutron count rate, and the γ-ray count rate are measured, respectively, and calculated by using a predetermined relational expression based on these measured values, so that the sludge is contained in the sludge in a short time. The volume content of each component can be obtained. That is, in the transport pipe through which the fluid (sludge) containing bubbles flows, the pressures at the measurement points A and B are set to the first pressure.
Set two conditions of pressure P and second pressure P ₀ , measure the respective pressure and neutron count rate, and measure the γ-ray count rate at either the first pressure P or the second pressure P _0. .
The two pressure values, the two neutron count rates, and the one γ-ray count rate, which are the measurement results, are calculated by an arithmetic processor using the arithmetic processing unit, and the bubble volume content, the water volume content, the organic matter volume content in the sludge, The inorganic volume content can be determined.

According to the apparatus for measuring the component ratio of the fluid flowing in the transport pipe, the neutron count rate and the γ-ray count rate are amounts that substantially depend only on the abundance ratio of specific atoms in the sludge. No preprocessing is required. In addition, the reaction between neutrons and γ-rays and specific atoms is prompt, and the neutron detector and γ-ray detector measure this reaction result.
The measurement time is also short. This makes it possible to measure the component ratio of the fluid flowing in the transport pipe from outside the transport pipe.

Next, in the apparatus of the above embodiment, the first neutron beam source 3 and the second neutron beam source 4 contain ^{2 52} Cf (radio isotope), and the γ-ray source 5 contains ¹³⁷ Cs (radio isotope). Sludge 1 under the condition of pressure P at measurement point A was used.
The case where the volume content of each component is measured will be described.

As described above, sludge 1 at measurement point A
Each volume content Sv, S of air bubbles, water, organic matter, and inorganic matter
w, So, Sa _{is, Sv = P 0 (N 0} · N 1 -N · N 10) / (N 0 · N 1 · P 0 -N · N 10 P) ... (12) So = ρwHwMo [ρ- ρa + (ρa−ρv) Sv + (ρa−ρw) (N / N ₁ )] / [(ρo−ρa) ρwHwMo + (ρa−ρw) ρoHoMw] (20) Sw = [ρwHwMo (N / N ₁ )] −ρoHoMwSo] / (ρwHwMo) (15-2) Sa = 1− (Sv + Sw + So) (19) ρ = [ln (G ₂ / G ₁ )] / (μX) + (2Sv−1) ρv (18) ).

[0076] _{N 1, N 1 0, G} 1 in the above equation is a constant necessary for the calculation, it is necessary to previously measured. N
₁ the conduit at the measurement point A is the neutron count rate when filled with water, N _{1 0} is the neutron count rate when filled with conduit at the measurement point B with water, G ₁ is a tube This is the gamma ray counting rate when the road is air. This is input to the arithmetic processing unit 21 in advance as a constant.

Now, at the measurement start time (t = 0), the component ratio of the sludge 1 transported in the transport pipe 2 at the measurement point A is measured. Fast neutrons having an average of about 2 MeV radiated from ²⁵² Cf, which is the first neutron radiation source 3, are mainly scattered by hydrogen atoms in the sludge 1 and gradually lose energy.
Eventually, it becomes a thermal neutron with very small energy,
As a result of detection by the first neutron detector 6, the counter 1
At 8, a count rate N is obtained.

At the same time, most of the γ-rays having an energy of about 0.66 MeV radiated from ¹³⁷ Cs as the γ-ray source 5 are scattered by the sludge 1 and change their directions.
A part is transmitted without being scattered, is incident on the γ-ray detector 8 and is detected. As a result, the γ-ray counting rate G ₂
Get.

Here, the flow rate of the sludge 1 measured by the flow meter 9 is Y (m / sec), the length of the pipeline between the measurement points A and B is L (m), If there is no change in the inner diameter of the transport pipe 2 between the measurement points B, t ₀ = L / Y
The sludge 1 passes through the measurement point B at (second) time. Therefore, at time t ₀ , the pressure and the neutron count rate are measured at the measurement point B. The first pressure P at the measurement point A
And the second pressure P ₀ at the measurement point B can be arbitrarily selected, but in the case of highly viscous dry sludge (low moisture sludge), the pressure loss in the transport pipe 2 is about 0.3 [(kg / cm _2). ) /
m], and the following relationship holds between the two.

P = P ₀ +0.3 L Based on this, the pipe length L between the measurement point A and the measurement point B is determined. In the present embodiment, the pipe length L is 5 (m), and about 1.5
(Kg / cm ₂ ) pressure loss was obtained. As with the measurement point A, fast neutrons emitted from ²⁵² Cf, which is the second neutron source 4, are scattered to become thermal neutrons, and are detected by the second neutron detector 7, and as a result, the counting rate N ₀ is counted by the counter 20.
Get.

The measured P, P ₀ , N, and N ₀ are input to the arithmetic processing unit 21 and the first sludge 1 of the sludge 1 is obtained based on the equation (12).
The bubble volume content ratio Sv under the pressure P is determined. In each constant of the above equations (20), (15-2), (19), and (18), X is the γ-ray transmission path length in the sludge 1, and
The amount depends on the pipe inner diameter. Since the main component of the sludge is water, the mass attenuation coefficient μ is set to μ = 0.085 (c) using the mass attenuation coefficient of water for 0.66 MeV γ-rays.
m ² / g) as density and water: ρw = 1.0 (g / cm)
³ ), organic matter: ρo = 1.5 (g / cm ³ ), inorganic matter:
ρa = 2.44 (g / cm ³ ), air: ρv = 1.29
3 × 10 ⁻³ (g / cm ³ ), Hw = 2, Mw =
18 (from the molecular formula H ₂ O of water), and the organic substance is represented by cellulose (C ₆ H ₁₀ O ₅ ), and Ho = 10 and Mo = 162.
Is input to the arithmetic processing unit 21 in advance. Using the Sv obtained from equation (12) and the measured values N, N ₀ , and G ₂ , So, Sw, Calculate Sa.

In the above embodiment, the first pressure P is adopted as one of the pressure conditions, and the volume contents of bubbles, organic substances, water, and inorganic substances under the conditions of the first pressure P are determined. Various measured values were measured under different pressure conditions, and finally the equation (2)
Using 1), (24), (25), and (26), it is also possible to determine the volume content of bubbles, organic substances, water, and inorganic substances under the condition of the first pressure P.

In the above embodiment, the component ratio of the sludge 1 was obtained by calculation using G ₁ and N ₁ measured in advance when obtaining the volume content of the inorganic substance and the volume content of the organic substance (water). but sludge average density by previously obtained calibration curve of sludge average density and G _2, also organic matter (water)
The volume content and the N / N ₁ , N ₀ / N ₁₀ calibration curves are obtained in advance, and the volume content of the organic matter (water) can also be obtained by performing correction in accordance with the volume content of the bubbles.

Further, in the above embodiment, an example of sludge as a fluid was described. However, the present invention is not limited to sludge only, but a slurry composed of pulverized coal, oil and water, or heavy oil, water and sand is used. The present invention can also be applied to a slurry or the like made of

In the above embodiment, ²⁵² Cf was used as the first neutron source 3 and the second neutron source 4.
Other neutron sources such as m-Be may be used. Also, γ
Although ¹³⁷ Cs is used as the radiation source 5, another gamma radiation source such as ¹⁹² Ir may be used.

Further, as the pressure difference between the measurement point A and the measurement point B is larger, the change in the volume of the bubble increases, so that the amount of change in the obtained measurement value also increases, and the components of the bubble, water, organic matter, and inorganic matter increase. The measurement accuracy of the volume content of the material is greatly improved. However, in the case of a sludge having a very high water volume content or a fluid having a low viscosity, such as water and heavy oil, the pressure loss in the horizontal transport pipe is small, and a practically usable fluid is measured between the measurement points A and B. Pressure difference may not be obtained.

In the case of such a low-viscosity fluid, the measurement point A and the measurement point B are used as in the apparatus of the second embodiment shown in FIG.
It is preferable to provide a height difference between the pressure and the pressure difference to generate a pressure difference due to gravity. In this case, the level at the measurement point B is higher than the level at the measurement point A by Z (m), and the pressure loss is caused by the difference in height. In FIG. 4, a pipe length L is a pipe length between the measurement point A and the measurement point B measured along the center line of the transport pipe 2. In order to generate a pressure difference other than this method, a method of partially reducing the inner diameter of the transport pipe may be considered.

[0088]

As described in detail above, according to the apparatus for measuring the component ratio of a fluid flowing in a transport pipe according to the present invention,
By measuring the neutron count rate for the same part of the fluid flowing through the transport pipe at two measurement points where pressure differences occur, the component ratio of the fluid can be determined with high accuracy regardless of the inclusion of bubbles in the fluid. By measuring the gamma ray counting rate of the fluid, the inorganic component ratio of the fluid can be measured with high accuracy.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing a device for measuring a component ratio of a fluid according to a first embodiment of the present invention, with a cutout;

FIG. 2 is a schematic diagram for explaining a definition of a neutron counting rate for each sample.

FIG. 3 is a characteristic diagram for explaining a measurement principle of a water / organic matter content ratio.

FIG. 4 is a block diagram schematically showing a device for measuring a component ratio of a fluid according to a second embodiment, with a cutout;

[Explanation of symbols]

1: Sludge, 2: Transport pipe, 3: First neutron source, 4: Second
Neutron source, 5 ... gamma ray source, 6 ... first neutron detector,
7 ... second neutron detector, 8 ... gamma ray detector, 9 ... current meter, 10 ... first pressure gauge, 11 ... second pressure gauge, 12,1
3, 14: preamplifier, 15, 16, 17: wave height discriminator, 18, 19, 20: counter, 21: arithmetic processing unit.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shuro Inokawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (72) Inventor Kiyoshi Uyama 61-1 Onocho, Tsurumi-ku, Yokohama-shi, Kanagawa JP-A-7-243994 (JP, A) JP-A-7-243995 (JP, A) JP-A-9-33452 (JP, A) JP-A-58-223039 (JP) JP, A) JP-A-61-71341 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01N 23/00-23/227 JICST file (JOIS)

Claims (5)

(57) [Claims] 1. A fluid component ratio measuring device for measuring the volume content of each component in a fluid, comprising: (a) a transport pipe through which the fluid flows; and (b) a transport pipe for the transport pipe. A first pressure gauge for detecting a fluid pressure at an arbitrary measurement point A, and (c) a first neutron source for irradiating a fluid flowing through the transport pipe at the measurement point A with neutrons from outside the pipe, (D) a first neutron detector for detecting neutrons scattered by the fluid;
(E) a first neutron counting means for counting the counting rate of the detected scattered neutrons, and (f) a second manometer for detecting a fluid pressure at another arbitrary measurement point B remote from the measurement point A. ,
(G) a second neutron source for irradiating neutrons from outside the fluid flowing through the transport pipe at the measurement point B, and (h) a second neutron detection for detecting neutrons scattered by the fluid. And (i) second neutron counting means for counting the count rate of the detected scattered neutrons, and (j) extracellularly the fluid flowing through the transport pipe at least one of the measurement points A and B. A gamma ray source for irradiating gamma rays from a gamma ray detector, and (k) a gamma ray detector for detecting gamma rays transmitted through a fluid,
(L) gamma ray counting means for counting the count rate of the detected transmitted gamma rays; (m) a flow meter for measuring the flow rate of the fluid in the transport pipe; (n) based on the obtained count rate, pressure and flow rate. And a calculating means for calculating at least one of the volume contents of water, organic substances, inorganic substances, and air bubbles contained in the fluid. 2. A fluid component ratio measuring method for measuring a volume content of each component in a fluid, wherein (a) a first fluid pressure which is a reference at an arbitrary measurement point A of a transport pipe. Detecting the second fluid pressure P ₀ at an arbitrary measurement point B on the transport pipe remote from the measurement point A; and (c) detecting the flow passing through the measurement point A. Irradiating an animal with neutrons, detecting scattered neutrons, counting the neutrons and counting them to obtain a neutron count rate N; (d) a flow between the measurement point A and the measurement point B; A flow velocity measuring step of measuring the flow velocity of the animal, and (e) a time at which the fluid passing through the measurement point A reaches the measurement point B based on the measured flow velocity and the length of the pipeline from the measurement point A to the measurement point B. And (f) irradiating the fluid passing through the measurement point B with neutrons at this time, Detecting turbulent neutrons, and a second neutron count rate measuring step of determining the neutron count rate N ₀ by counting this, (g) and neutron count rate N obtained, advance the first water under fluid pressure P The neutron count rate ratio (N / N ₁ ) was calculated from the neutron count rate N ₁ determined for only the sample, and the obtained neutron count rate N ₀ was previously calculated under the second fluid pressure P ₀ . the ratio of the neutron count rate from the neutron count rate N _{1 0} Metropolitan which has been determined for a sample of water only (N ₀ / N _{1 0}
) Is calculated, and further, a step of calculating a ratio _{(N 0 / N 1 0)} / (N / N 1) from the ratio of these neutron count rate,
(H) obtained ratio _{(N 0 / N 1 0)} / a volume content Sv of bubbles fluids in under the conditions of (N / N ₁₎ the basis of the first pressure P using the formula a step of _{calculating, Sv = P 0 (N 0} · N 1 -N · N 10) / (N 0 · N 1 ·
(P ₀ -N · N ₁₀ P). 3. The method further comprises: (i) irradiating the sample of the fluid with gamma rays under the condition of the first pressure P, measuring the count rate G ₂ of gamma rays passing through the fluid, and measuring the measured gamma ray count rate G _2. And a gamma ray counting rate G ₁ previously determined for a sample of only air under the condition of the first pressure P, a ratio of the gamma ray counting rate (G ₂ / G ₁ ), and the bubble volume content rate Sv
Calculating the average density ρ of the fluid based on the following equation: ρ = [ln (G ₂ / G ₁ )] / (μX) + (2Sv−
1) ρv (j) Based on the neutron counting rate ratio (N / N ₁ ), the average density ρ of the fluid, and the volume content Sv of the bubbles, the first pressure P A step of calculating the volume content rate So of the organic substance contained in the fluid under the conditions; and So = ρwHwMo [ρ−ρa + (ρa−ρv) Sv +
(Ρa−ρw) (N / N ₁ )] / [(ρo−ρa) ρw
HwMo + (ρa-ρw) ρoHoMw ] However, Rodaburyu the density of water (g / cm ^3), ρo is the density of the organic matter (g / cm ^3), ρa is the density of the inorganic (g / cm ^3), ρv is the air Density (g / cm ³ ), Hw represents the number of hydrogen atoms contained in one molecule of water, Ho represents the number of hydrogen atoms contained in one molecule of an organic substance, Mw represents the molecular weight of water, and Mo represents the molecular weight of the organic substance. 3. The method for measuring a component ratio of a fluid according to claim 2, comprising: 4. The fluid under the condition of a first pressure P using the following equation based on (k) the ratio of the neutron count rates (N / N ₁ ) and the organic matter volume content So. 4. The method for measuring a component ratio of a fluid according to claim 3, further comprising a step of calculating a volume content Sw of water contained in the fluid. Sw = [ρwHwMo (N / N ₁ ) −ρoHoMwS
o] / (ρwHwMo) 5. The method according to claim 1, further comprising:
And a step of calculating a volume content Sa of the inorganic substance contained in the fluid under the condition of the first pressure P based on the organic content volume content So and the water volume content Sw using the following equation. The method for measuring a component ratio of a fluid according to claim 4, wherein: Sa = 1− (Sv + Sw + So)