JPS61126457A - Measuring method of mass of mixture of multiphase flow in conduit - Google Patents
Measuring method of mass of mixture of multiphase flow in conduitInfo
- Publication number
- JPS61126457A JPS61126457A JP24816884A JP24816884A JPS61126457A JP S61126457 A JPS61126457 A JP S61126457A JP 24816884 A JP24816884 A JP 24816884A JP 24816884 A JP24816884 A JP 24816884A JP S61126457 A JPS61126457 A JP S61126457A
- Authority
- JP
- Japan
- Prior art keywords
- multiphase flow
- mixed
- resistance value
- amount
- measuring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
- G01N27/07—Construction of measuring vessels; Electrodes therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measuring Volume Flow (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、電気伝導性の液体と気体との混相流など、
電気伝導性の液体中に電気伝導性が前記液体と大きく異
なる物質が混合した、管路内を流れる二相の混相流の前
記物質の混合量を測定する方法に関するものである。[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a multiphase flow of an electrically conductive liquid and a gas, etc.
The present invention relates to a method for measuring the amount of a mixed substance in a two-phase multiphase flow flowing in a pipe, in which an electrically conductive liquid is mixed with a substance whose electrical conductivity is significantly different from that of the liquid.
管路内を流れる液体に気体が混合した二相の混相流の前
記気体の混合割合（以下ボイド率と称す）は、（１）ガ
ンマ線密度計による方法、（２）静電容量法、（３）電
極法、（４）光学プローブ法等によって、測定されてい
る。このうち、（３）の電極法、（４）の光学プローブ
法では、混相流中に浸漬した電極または光学プローブの
近傍の局所のボイド率が測定されるので、混相流のある
程度の大きさの有限体積中の平均のディト率を測定する
のには、適してない。また、これら（３） 、 （４）
の方法では、電極または光学ブローブを混相流中に浸漬
するので、流れの状態を乱す可能性がある。The mixing ratio of gas (hereinafter referred to as void ratio) of a two-phase multiphase flow in which gas is mixed with liquid flowing in a pipe can be determined by (1) a method using a gamma ray densitometer, (2) a capacitance method, (3) ) electrode method, (4) optical probe method, etc. Of these, in the electrode method (3) and the optical probe method (4), the local void fraction near the electrode or optical probe immersed in the multiphase flow is measured. It is not suitable for measuring the average det rate in a finite volume. Also, these (3) and (4)
The method involves immersing electrodes or optical probes in a multiphase flow, which can disturb the flow conditions.
次に、（２）の静電容量法、（１）のガンマ線密度計に
よる方法では、混相流中にセンサーを浸漬することがな
いので、流れの状態を乱すことなく混相流のボイド率を
測定することができ、またボイド率は、混和流の有限体
積中の平均ボイド率が測定される。Next, with the capacitance method (2) and the gamma ray density meter method (1), the sensor is not immersed in the multiphase flow, so the void ratio of the multiphase flow can be measured without disturbing the flow state. The void fraction can be measured as the average void fraction in a finite volume of the mixing flow.
し力・しながら、（２）の静電容量法では、ボイド率を
測定できるのは、液体が非電気伝導性の混相流の場合で
あって、液体が電気伝導性の混相流の場合にはボイド率
を測定できない。また液体が非電導性の混相流にあって
も、ボイド率の変化による混相流の静電容量変化は、数
ｐＦというように一般に極めて小さいので、ボイド率を
高い精度で測定することが内皮１ｔな場合が多い。これ
に対しく１）のガンマ線密度計による方法では、液体が
電気゛ 伝導性の混相流にあっても、ボイド率を測
定できる。しかし、（１）の方法では、一般に測定精度
を高めるためには、線源を強力にしたり、測定時間を長
くする必要があり、測定の安全性、迅速性に問題がある
。また、混相流の流れの様式（気泡流、スラグ流、層状
流等）によらず正確な測定ができるようにするためには
、混相流が流れる管路の管外周面上に複数個の線源を設
け、測定結果を演算処理してボイド率を求めるようにす
る必要がある。However, in the capacitance method (2), void fraction can be measured only when the liquid is a non-electrically conductive multiphase flow, and when the liquid is an electrically conductive multiphase flow. cannot measure void fraction. Furthermore, even if the liquid is in a non-conductive multiphase flow, the change in capacitance of the multiphase flow due to a change in void fraction is generally extremely small, such as a few pF. There are many cases. On the other hand, in the method 1) using a gamma ray densitometer, the void fraction can be measured even if the liquid is in an electrically conductive multiphase flow. However, in method (1), in order to improve measurement accuracy, it is generally necessary to make the radiation source more powerful or to lengthen the measurement time, which poses problems in the safety and speed of measurement. In addition, in order to make accurate measurements regardless of the flow style of the multiphase flow (bubbly flow, slug flow, laminar flow, etc.), it is necessary to place multiple lines on the outer circumferential surface of the pipe through which the multiphase flow flows. It is necessary to provide a source and calculate the void ratio by processing the measurement results.
そのため、（１）の方法ではボイド率測定のだめの費用
が増大する。Therefore, in method (1), the cost of measuring the void ratio increases.
この発明は、上述の現状に鑑み、電気伝導性の液体と気
体との混相流など、電気伝導性の液体中に電気伝導性が
前記液体と大きく異なる物質が混合した、管路内を流れ
る二相の混相流の前記物質の混合量を、管路内で混相流
の流れの状態を乱すことなく、かつ簡便に測定すること
ができる測定方法を提供することを目的とする。In view of the above-mentioned current situation, the present invention has been developed to provide two types of flow, such as a multiphase flow of an electrically conductive liquid and a gas, in which an electrically conductive liquid is mixed with a substance whose electrical conductivity is significantly different from that of the liquid, which flows in a pipe. It is an object of the present invention to provide a measuring method that can easily measure the mixing amount of the substances in a multiphase flow without disturbing the flow state of the multiphase flow in a pipe.
この発明は、電気伝導性の液体中に前記液体と電気伝導
性が大きく異なる物質が混合した混相流が流れる管路の
途中に、３つの絶縁リングと電気抵抗測定器の測定端の
各々が接続された２つの金属リングとを、前記絶臓リン
グが両端に位置するように直列に交互に配置してなる、
前記管路の管径と同径の測定リングを連結して、前記２
つの金属リング間の前記混相流の電気抵抗値を測定し、
予め前記物質の混合量が既知の前記混相流について前記
測定リングで求めた、前記混相流の電気抵抗値と前記物
質の混合量との関係に基づいて、前記測定された電気抵
抗値から、前記電気抵′抗値を測定した前記混相流の前
記物質の混合量を求めることに特徴を有する。In this invention, each of three insulating rings and the measuring end of an electrical resistance measuring device is connected in the middle of a pipe through which a multiphase flow in which a substance having a significantly different electrical conductivity from the liquid is mixed in an electrically conductive liquid flows. and two metal rings arranged alternately in series such that the intestine ring is located at both ends,
A measuring ring having the same diameter as the pipe diameter of the pipe line is connected to
Measuring the electrical resistance value of the multiphase flow between two metal rings,
Based on the relationship between the electrical resistance value of the multiphase flow and the mixing amount of the substance, which is determined by the measuring ring for the multiphase flow in which the mixing amount of the substance is known in advance, from the measured electrical resistance value, the The present invention is characterized in that the mixed amount of the substance in the multiphase flow whose electrical resistance value is measured is determined.
以下 この発明の詳細な説明する。 This invention will be described in detail below.
第１図はこの発明の方法を実施するために用いられる混
合物質量測定装置の分解斜視図である。FIG. 1 is an exploded perspective view of a mixed substance amount measuring device used to carry out the method of the present invention.
第１図に示されるように、測定装置１は、３つの絶縁リ
ング２と２つの金属リング３とを、絶縁リング２が両端
に位置するように直列に交互に配置して連結する測定リ
ング４と、金属リング３の各々に測定端から引き出され
たリード線５を接続した電気抵抗測定器６とからなる。As shown in FIG. 1, the measuring device 1 includes a measuring ring 4 that connects three insulating rings 2 and two metal rings 3 by alternately arranging them in series so that the insulating rings 2 are located at both ends. and an electrical resistance measuring device 6 in which lead wires 5 drawn out from measurement ends are connected to each of the metal rings 3.
２つの金属リング３．３間に挿入する中央の絶縁リング
２は、２つの金属リング３を適宜間隔で絶縁的に隔置す
るためのものである。２つの金属リング３の外側に配置
する両端の絶縁リング２は、測定リング４を連結する管
路との絶縁をとるためである。絶縁リング２としては、
例えばアクリル等の樹脂ノクイデが用いられる。金属リ
ング３としては、例えば銅等の金属ノ４イデが用いられ
る。これら絶縁リング２および金属リング３は、連結す
る管路の管径と同径に形成される。The central insulating ring 2 inserted between the two metal rings 3.3 is for insulatingly spacing the two metal rings 3 at appropriate intervals. The insulating rings 2 at both ends disposed on the outside of the two metal rings 3 are for insulating the measurement rings 4 from the pipe line connecting them. As the insulating ring 2,
For example, a resin material such as acrylic is used. As the metal ring 3, a metal material such as copper is used, for example. These insulating ring 2 and metal ring 3 are formed to have the same diameter as the pipe diameter of the pipe line to which they are connected.
この発明では、このような測定装置１の測定リング４を
、例えば第２図に示すようなプラント７に配管された管
路８の途中に連結して、管路８内を流れる二相の混相流
を測定リング４内を流し、そのときの金属リング３，３
間の電気抵抗値を電気抵抗測定器６で測定して、混相流
中の混合物質量を求めるものである。In this invention, the measuring ring 4 of such a measuring device 1 is connected to the middle of a pipe line 8 piped to a plant 7 as shown in FIG. The current flows through the measuring ring 4, and the metal rings 3, 3 at that time
The amount of mixed substance in the multiphase flow is determined by measuring the electrical resistance value between them using an electrical resistance measuring device 6.
水に空気が混合した二相の混相流など、電気伝導性の液
体中に電気伝導性が前記液体と大きく異なる物質が混合
した二相の混相流では、混相流を測定リング４内に流し
て金属リング３，３間の電気抵抗値を測定すると、その
電気抵抗値は、混和流中の前記混合物質の混合割合（混
和流体一定体積中の混合物質量）に比例して変化する。In a two-phase multiphase flow in which an electrically conductive liquid is mixed with a substance whose electrical conductivity is significantly different from that of the liquid, such as a two-phase multiphase flow in which air is mixed with water, the multiphase flow is caused to flow into the measuring ring 4. When the electrical resistance value between the metal rings 3, 3 is measured, the electrical resistance value changes in proportion to the mixing ratio of the mixed substance in the mixing flow (the amount of the mixed substance in a constant volume of the mixing fluid).
従って、液体と混合物質の種類が管路８内を流れる二相
の混和流と同一で、かつ前記混合物質の混合量が既知の
二相の混相流を、管路８内を流れる二相の混相流と同一
の条件で管路８内に流して、そのときの電気抵抗値を測
定装置１で測定し、電気抵抗値と混合物質量との関係を
予めておけば、その関係から、管路８内を流れる二相の
混相流の電気抵抗値を測定装置１で測定することにより
、前記混相流中の混合物質量が一般に求まる。Therefore, a two-phase mixed flow in which the types of liquid and mixed substance are the same as the two-phase mixed flow flowing in the pipe line 8 and the mixed amount of the mixed substance is known is replaced with a two-phase mixed flow flowing in the pipe line 8. If the electric resistance value at that time is measured with the measuring device 1 by flowing into the pipe 8 under the same conditions as the multiphase flow, and the relationship between the electric resistance value and the amount of mixed substance is determined in advance, from that relationship, the pipe line By measuring the electric resistance value of the two-phase multiphase flow flowing through the multiphase flow with the measuring device 1, the amount of the mixed substance in the multiphase flow can generally be determined.
例えば、管路を流れる水に空気が混合した空気の混合量
が既知の混和流について測定装置１で電気抵抗値を測定
すると、第３図に示すような電気抵抗値と空気のボイド
率（混合割合）との関係が得られる（なお、第３図では
、ボイド率ｙ （ＶＯｌｕｍｅ係）は、ｘ ＝ １００
− Ｖなる水の混合割合Ｘ（ＶＯｌｕｍｅ ％）を使
って表示しである）。従って、管路を流れる水に空気が
混合した混相流について、測定装置１で同一の条件の下
で電気抵抗値を測定すれば、第３図から、混和流のボイ
ド率が求まる。For example, when measuring the electrical resistance value using measuring device 1 for a mixed flow with a known mixing amount of air mixed with water flowing through a pipe, the electrical resistance value and air void ratio (mixture (in Figure 3, the void ratio y (VOlume ratio) is x = 100
- It is expressed using the mixing ratio of water X (VOlume %) called V). Therefore, if the electrical resistance value of a multiphase flow in which air is mixed with water flowing through a pipe is measured under the same conditions using the measuring device 1, the void ratio of the mixed flow can be determined from FIG.
以上のように、この発明では、測定装置１の測定リング
４を管路の途中に連結して、管路を流れる二相の混相流
の電気抵抗値を測定して、混和流の混合物質量を求める
ので、混相流の流れの状態を乱すことなく混合物質量の
測定ができる。また混合物質量が測定できる混相流とし
ては、水に空気が混合した混相流に限られず、水に油が
混合したもの、水にプラスチックが混合したもの、水に
鉄微粒子が混合したものなど、電気伝導性の液体中に電
気伝導性が前記液体と大きく異なる物質が混合した二相
の混相流ならば、いずれも測定可能である。さらに、こ
の発明では、測定装置】の構成が簡単で、市販の電気抵
抗測定器等を用いて容易に製作できる利点もある。As described above, in this invention, the measuring ring 4 of the measuring device 1 is connected in the middle of the pipe, and the electrical resistance value of the two-phase multiphase flow flowing through the pipe is measured, and the amount of mixed substances in the mixing flow is determined. Therefore, the amount of mixed substances can be measured without disturbing the flow state of the multiphase flow. In addition, multiphase flows for which the amount of mixed substances can be measured are not limited to multiphase flows in which water and air are mixed, but also include those in which oil is mixed in water, plastics are mixed in water, iron particles are mixed in water, etc. Any two-phase multiphase flow in which a conductive liquid contains a substance whose electrical conductivity is significantly different from that of the liquid can be measured. Further, the present invention has the advantage that the measuring device has a simple configuration and can be easily manufactured using a commercially available electric resistance measuring device.
この発明の方法によれば、電気伝導性の液体中に電気伝
導性が前記気体と大きく異なる物質が混合した、管路内
を流れる二相の混相流について、混和流の流れを乱すこ
となく、混相流の混合物質量を測定することができ、ま
た測定に使用する装置も構成が簡単で、かつ測定も容易
に行なえる。According to the method of the present invention, for a two-phase multiphase flow flowing in a pipe in which a substance whose electrical conductivity is significantly different from that of the gas is mixed in an electrically conductive liquid, without disturbing the flow of the mixed flow, The amount of mixed substances in a multiphase flow can be measured, and the device used for the measurement has a simple configuration and can be easily measured.
第１図はこの発明の方法に使用する測定装置の一態様を
示す分解斜視図、第２図は第１図の装置の使用法を示す
説明図、第３図は第１図の装置によって測定された二相
流の抵抗値と混合物質量との関係を示すグラフである。
図面において、１・・・測定装置、 ２・・・
絶Ｒ’）ング、３・・・金属リング、 ４・・・
測定リング、５・・・リード線、 ６・・・電
気抵抗測定器、７・・・プラント、 ８・・・管
路。Fig. 1 is an exploded perspective view showing one aspect of the measuring device used in the method of the present invention, Fig. 2 is an explanatory diagram showing how to use the device shown in Fig. 1, and Fig. 3 is a measurement using the device shown in Fig. 1. It is a graph which shows the relationship between the resistance value of the two-phase flow, and the amount of mixed substances. In the drawings, 1... measuring device, 2...
Absolute R') ng, 3...metal ring, 4...
Measuring ring, 5...Lead wire, 6...Electric resistance measuring device, 7...Plant, 8...Pipeline.
Claims (1)
なる物質が混合した混相流が流れる管路の途中に、３つ
の絶縁リングと電気抵抗測定器の測定端の各々が接続さ
れた２つの金属リングとを、前記絶縁リングが両端に位
置するように直列に交互に配置してなる、前記管路の管
径と同径の測定リングを連結して、前記２つの金属リン
グ間の前記混相流の電気抵抗値を測定し、予め前記物質
の混合量が既知の前記混相流について前記測定リングで
求めた、前記混相流の電気抵抗値と前記物質の混合量と
の関係に基づいて、前記測定された電気抵抗値から、前
記電気抵抗値を測定した前記混相流の前記物質の混合量
を求めることを特徴とする、管路内混相流の混合物質量
測定方法。In the middle of a pipe through which a multiphase flow consisting of an electrically conductive liquid mixed with a substance whose electrical conductivity is significantly different from that of the liquid flows, there are two pipes connected to each of three insulating rings and the measuring end of an electrical resistance measuring device. The mixed phase between the two metal rings is measured by connecting measurement rings having the same diameter as the pipe diameter of the conduit, which are arranged alternately in series such that the insulating rings are located at both ends. The electric resistance value of the flow is measured, and based on the relationship between the electric resistance value of the multiphase flow and the mixing amount of the substance, which is determined by the measuring ring for the multiphase flow in which the mixing amount of the substance is known in advance, A method for measuring the amount of a mixed substance in a multiphase flow in a pipe, the method comprising determining the amount of the substance mixed in the multiphase flow whose electrical resistance value is measured from the measured electrical resistance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24816884A JPS61126457A (en) | 1984-11-26 | 1984-11-26 | Measuring method of mass of mixture of multiphase flow in conduit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24816884A JPS61126457A (en) | 1984-11-26 | 1984-11-26 | Measuring method of mass of mixture of multiphase flow in conduit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61126457A true JPS61126457A (en) | 1986-06-13 |
Family
ID=17174224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24816884A Pending JPS61126457A (en) | 1984-11-26 | 1984-11-26 | Measuring method of mass of mixture of multiphase flow in conduit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61126457A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103776875A (en) * | 2014-01-23 | 2014-05-07 | 天津大学 | Four-section distributed conductivity sensor for two-phase flow detection |
| CN110243876A (en) * | 2019-06-25 | 2019-09-17 | 西安交通大学 | Conductivity sensor for biphase gas and liquid flow void fraction instantaneous measurement |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54155893A (en) * | 1978-05-29 | 1979-12-08 | Saburou Miyazaki | Method and device for confirming mixed state of plural substances |
-
1984
- 1984-11-26 JP JP24816884A patent/JPS61126457A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54155893A (en) * | 1978-05-29 | 1979-12-08 | Saburou Miyazaki | Method and device for confirming mixed state of plural substances |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103776875A (en) * | 2014-01-23 | 2014-05-07 | 天津大学 | Four-section distributed conductivity sensor for two-phase flow detection |
| CN110243876A (en) * | 2019-06-25 | 2019-09-17 | 西安交通大学 | Conductivity sensor for biphase gas and liquid flow void fraction instantaneous measurement |
| CN110243876B (en) * | 2019-06-25 | 2020-11-10 | 西安交通大学 | Conductivity sensor for transient measurement of gas-liquid two-phase flow gas content |
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