JPS6141921A - Injecting device for tracer gas used for flow rate measurement of gas in pipe - Google Patents

Injecting device for tracer gas used for flow rate measurement of gas in pipe

Info

Publication number
JPS6141921A
JPS6141921A JP16281184A JP16281184A JPS6141921A JP S6141921 A JPS6141921 A JP S6141921A JP 16281184 A JP16281184 A JP 16281184A JP 16281184 A JP16281184 A JP 16281184A JP S6141921 A JPS6141921 A JP S6141921A
Authority
JP
Japan
Prior art keywords
gas
tracer gas
flow rate
container
tracer
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.)
Granted
Application number
JP16281184A
Other languages
Japanese (ja)
Other versions
JPH0516533B2 (en
Inventor
Futahiko Nakagawa
二彦 中川
Shuichi Taniguchi
修一 谷口
Masatoshi Ichinomiya
一宮　正俊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP16281184A priority Critical patent/JPS6141921A/en
Publication of JPS6141921A publication Critical patent/JPS6141921A/en
Publication of JPH0516533B2 publication Critical patent/JPH0516533B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/704—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

PURPOSE:To obtain an accurate flow rate of gas by injecting tracer gas into the gas in a pipe from a tracer gas container, calculating the injection amount of the tracer gas from a decrease in the weight of the tracer gas container, and detecting the concentration of the tracer gas in the mixed gas. CONSTITUTION:The gas flows in the pipe P as shown by an arrow G. The tracer gas T is injected into the pipe P at the upstream side from the pressure container 1. The tracer gas T is mixed with the gas and the mixed gas MG is sampled at the downstream side to detect the concentration of the tracer gas. At this time, the weight of the pressure container 1 is measured at constant intervals of time and the injection amount of the tracer gas is calculated from a decrease in the weight. Then, the flow rate of the gas is calculated from the relational expression between the tracer gas concentration and injection amount. Thus, not only the tracer gas concentration, but also the injection amount is detected accurately and the flow rate is calculated from the relational equation, so the gas flow rate is measured with high precision.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、配管内を流れる気体の流量を測定する際に使
用するトレーサガスの注入量を正確に把握できる注入装
置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an injection device that can accurately determine the injection amount of tracer gas used when measuring the flow rate of gas flowing in a pipe.

（従来の技術） 従来、配管内をｂｌｌ、れる気体のＲ，量を測定する方
法として、六・フ２化イオ７　（，５Ｆ６）ガス等の気
体をトレーサガスとし°Ｃ利用するものが知られている
０ この方法は、配管内を流れる被測定気体（以下気体とす
る）の流１ｔｔｔＷＩ定する場合、まず配管の上流側に
トレーサガスをほぼ一定の流量で注入し、下流側におい
て気体とトレーサガスとの混合ガスを採集し、その濃度
（モル又は体積濃度）をＥＣＤ（Ｅｌｅｃｔｒｏｎ　０
ａｐｔｕｒｅ　Ｉ）ｅｔｅｃｔｏｒ）付ガスクｏマドグ
ラ７等の分析計で測定し、下記（１）式により気体の流
量を求めるものである。(Prior art) Conventionally, as a method for measuring the amount of gas flowing inside a pipe, there is a method using °C as a tracer gas such as ion hexafluoride 7 (,5F6) gas. 0 In this method, when determining the flow rate of the gas to be measured (hereinafter referred to as gas) flowing inside a pipe, first the tracer gas is injected at a nearly constant flow rate into the upstream side of the pipe, and then the tracer gas is injected into the gas on the downstream side. Collect the mixed gas with the tracer gas and measure its concentration (molar or volumetric concentration) using an ECD (Electron 0
The gas flow rate is measured using an analyzer such as a Gascomadura 7 equipped with an apture I) detector, and the flow rate of the gas is determined using the following equation (1).

Ｘニー気体の流量 ｖ：トレーサガスの流入流量 Ｑ／ｓ・気体中に最初から含まれているトレーサガスと
同一のガスの濃度 ＯＯ：″注入したトレーサガス°の純度（濃度）０：気
体とトレーサガスとの混合ガス中の１５トレーサガスの
濃度測定値 α：単位換算係数 前記（１）式から明らかなように、トレーサガスの注入
流ｉｋｖは、気体の流量を求める上で重要な要素である
。従来、トレーサガスの注入流量の計測、１は、トレー
サガスを圧入した容器（ボンベ）と気体の配管との間を
接続する注入管に配設したブリッジ回路を用いた流量計
及びオリフィス等により行っていた。X knee gas flow rate v: Tracer gas inflow flow rate Q/s・Concentration of the same gas as the tracer gas originally contained in the gas OO: ″Purity (concentration) of the injected tracer gas ° 0: Gas and Measured concentration α of 15 tracer gas in the mixed gas with tracer gas: Unit conversion coefficient As is clear from the above equation (1), the tracer gas injection flow ikv is an important factor in determining the gas flow rate. Conventionally, measuring the injection flow rate of tracer gas, 1 is a flow meter and orifice using a bridge circuit installed in the injection pipe that connects the container (cylinder) in which the tracer gas is pressurized and the gas piping. It was done by

（発明が解決しようとする問題点〕 この従来の流量計は、トレーサガスの流量を一定流量に
保つとともに、その流量を計測するものであるが、流量
算出嗜の物性値及び重量計の持つ補正係数等によって精
度が左右され、ざらにＦＳ（フルスケール）においては
１〜２チ程度のｔ度を持つものであつ′Ｃも実際に使用
する流量における精度はこれよりも悪く、吹き込むトレ
ーサガスの絶対流量の測定種度上の問題となっていた。(Problems to be Solved by the Invention) This conventional flow meter maintains the flow rate of tracer gas at a constant flow rate and measures the flow rate. Accuracy is affected by coefficients, etc., and it has a t degree of about 1 to 2 inches at FS (full scale), and the accuracy at the actual flow rate used is worse than this, and the accuracy of the injected tracer gas The measurement of absolute flow rate was problematic.

（問題点を解決するための手段） 本発明は、前記問題点を解決するために、トレーサガス
を圧入した容器を、被測定気体配管に注入管を介して接
続し、配管内にトレーサガスを注入する注入装置に、 トレーサガスを圧入した容器をｉ＠置し、この容器の重
量を一定時間毎に測定して出力する重量計と、 この重量計の出力値を積算して容器内のトレーサガスの
重量減少量を所定時間毎に記録する記録計とを備え、ト
レーサガスの流量測定を正確に行うようにした。(Means for Solving the Problems) In order to solve the above problems, the present invention connects a container pressurized with tracer gas to the gas piping to be measured via an injection pipe, and injects the tracer gas into the piping. A container containing pressurized tracer gas is placed in the injection device, and a weighing scale is installed to measure and output the weight of the container at regular intervals. It is equipped with a recorder that records the amount of weight loss of the gas at predetermined intervals to accurately measure the flow rate of the tracer gas.

（作用） 本発明装置では、重量の減少量によって流量を求めてい
るが、重量の測定は、環境を一定に保持すれば、正確に
行うことができるため、重量の減少量に基づいて流量を
算出する場合の誤差は極めて小さなものとなる。(Function) In the device of the present invention, the flow rate is determined based on the amount of weight reduction. However, since weight measurement can be performed accurately if the environment is kept constant, the flow rate is determined based on the amount of weight reduction. The error in calculation is extremely small.

そこで本発明では、容器周囲の環境を一定に保つことに
も配慮している。例えば、容器にかかる浮力を一定にす
るため、空気密度が変化しないように防風処置を行い、
さらに容器の温度低下を加熱装置によって防止している
。Therefore, in the present invention, consideration is given to keeping the environment around the container constant. For example, in order to keep the buoyant force on the container constant, wind protection measures are taken to prevent changes in air density.
Furthermore, a heating device prevents the temperature of the container from decreasing.

（実施例） 以下、本発明の実施例について、第１図を参照して説明
する。(Example) Hereinafter, an example of the present invention will be described with reference to FIG.

まず、トレーサガスの注入装置が接続する配管Ｐには、
気体Ｇが流れており、この配管Ｐ内へ上流側からトレー
サガスＴを注入し、下流側で気体ＧとトレーサガスＴと
の混合ガスＭＧを採集し、その測定濃度値から、前記（
１）式を用い気体Ｇの流量を求めている。First, the pipe P to which the tracer gas injection device is connected is
Gas G is flowing, tracer gas T is injected into this pipe P from the upstream side, a mixed gas MG of gas G and tracer gas T is collected downstream, and from the measured concentration value, the above (
1) The flow rate of gas G is determined using the formula.

配管Ｐ内に注入するトレーサガスＴは、ボンベ等の容器
１に圧入してあり、容器１に接続具２を介して注入管８
の一端を接続している。注入管３の他端は配管Ｐに接続
し、注入管８の中間部に定流型袋［４を設けている。定
流量装置４は、トレーサガスＴを一定流量で配管Ｐ内に
注入するためのものである。定ｆｉＥｆｉ装置４として
は、従来同様にブリッジ回路を用いた流量計を使用して
もよいが、在来の流量調整弁等の流量設定が可能であり
、かつ設定された流量を維持できるものであればよい。The tracer gas T to be injected into the pipe P is press-fitted into a container 1 such as a cylinder, and is connected to the container 1 via a connector 2 to an injection pipe 8.
One end of the is connected. The other end of the injection pipe 3 is connected to the pipe P, and a constant flow type bag [4 is provided in the middle part of the injection pipe 8. The constant flow device 4 is for injecting the tracer gas T into the pipe P at a constant flow rate. As the constant fiEfi device 4, a flow meter using a bridge circuit may be used as in the conventional case, but it is not possible to use a conventional flow rate adjustment valve or the like that can set the flow rate and maintain the set flow rate. Good to have.

伺、容器１内の圧力を、例えばｇｏｋｇ／ｃ−程度の高
圧とした場合は、注入管３の途中に絞り弁を設けるか、
又は注入管ａ自体を小径のものにする等の手段を講じて
も定流性を得ることができるが、調整の容易さと、容器
１内の圧力が低下した場合のことを勘案すれば、定流量
装置を用いるのが望ましい。また、５ａは容器１の開閉
用コック、５ｂは注入管８と配管Ｐとの間を遮断するコ
ックである。However, if the pressure inside the container 1 is set to a high pressure of, for example, gokg/c-, a throttle valve should be provided in the middle of the injection pipe 3, or
Alternatively, constant flow performance can be obtained by taking measures such as making the injection pipe a itself smaller in diameter, but if you take into account the ease of adjustment and the possibility of a drop in the pressure inside the container 1, Preferably, a flow device is used. Further, 5a is a cock for opening and closing the container 1, and 5b is a cock for blocking the connection between the injection pipe 8 and the piping P.

また、配管Ｐに接続する容器１の下方に重量計６を設け
である。１ｕ量計６は容器１を載置し、容器１の重量を
一定時聞毎（例えば０．８秒）に計測し、この計測値を
ｆｔ−１ｍ計６に接続している記録計７に出力するよう
になっている。記録計７は、重量計６からの出力値を積
算して、所定の時間毎（例えば１秒ないし６０秒）に容
器１の重量変化を記録する。容器１の重量の変化量はト
レーサガスＴの減少量を示すものであり、この値からＦ
レーサガスＴの流量を容易に求めることができる。Further, a weighing scale 6 is provided below the container 1 connected to the pipe P. The 1u weight meter 6 places the container 1 on it, measures the weight of the container 1 at regular intervals (for example, 0.8 seconds), and sends the measured value to the recorder 7 connected to the ft-1m meter 6. It is designed to be output. The recorder 7 integrates the output values from the weight scale 6 and records changes in the weight of the container 1 at predetermined intervals (for example, from 1 second to 60 seconds). The amount of change in the weight of container 1 indicates the amount of decrease in tracer gas T, and from this value F
The flow rate of the laser gas T can be easily determined.

尚、記録計としては、重量変化量をトレーサガスＴの流
量に換算して記録するものにすれば、さらに便利である
。また、重量計６の下部には防振マット８を設けてあり
、外部からの振動によって重量計６の精度が落ちないよ
うに配慮している。It would be more convenient to use a recorder that converts the amount of weight change into the flow rate of the tracer gas T and records it. Further, a vibration-proof mat 8 is provided at the bottom of the weighing scale 6 to prevent the precision of the weighing scale 6 from decreasing due to external vibrations.

さらに、容器１及び重量計６の周囲に着脱可能な防風カ
バー９を設けている。防風カバー９は、容器１及び重量
計６が風の影響を受けないためのものである。風、つま
り空気の移動が容器１の周囲にあると、容器１周囲の空
気の密度が変化し、容器１が受ける浮力を変化するため
、容？５１の重量に影響を与えることになる。また、容
器１にかかる風圧によっても重量に影響がでることもあ
る。Further, a removable windproof cover 9 is provided around the container 1 and the weighing scale 6. The windproof cover 9 is provided to prevent the container 1 and the scale 6 from being affected by wind. When there is wind, that is, movement of air around the container 1, the density of the air around the container 1 changes, which changes the buoyancy force that the container 1 receives. This will affect the weight of 51. Furthermore, the weight may also be affected by the wind pressure applied to the container 1.

伝えば、トレーサガスＴとしてＳＦ６ガスを使用し、風
速５〜１０　ＩＩＬ／Ｓの屋外において注入を行ってみ
ると、流量がｌ　ＯＮｔ／ｍｉｎの場合の誤差は最大５
．４１流量が３Ｎｊ／ｍｉｎの場合の誤差は最大１７．
９％にも達し、風の影響を無視できないことがわかる。In other words, when SF6 gas is used as the tracer gas T and injection is performed outdoors at a wind speed of 5 to 10 IIL/S, the error is at most 5 when the flow rate is 1 ONt/min.
．． 41 When the flow rate is 3Nj/min, the maximum error is 17.
It reaches 9%, which shows that the influence of wind cannot be ignored.

そこで、容器１及び重量計６の周囲に防風カバー９を設
けるのは効果的である。Therefore, it is effective to provide a windproof cover 9 around the container 1 and the weight scale 6.

さらにまた、トレーサガスＴの流量が大きい場合、容器
１からのトレーサガスでの噴出速度が大きくなるため、
トレーサガスＴ自体の急激な断熱膨張及び液化したガス
が気化するときの蒸発ｍ熱によって、容器１内部で急冷
現象が起る。したがって、容器１内のガス容量が、戚少
するにつれて、容器１内部での急冷現象は加速度的に進
行する。Furthermore, when the flow rate of the tracer gas T is large, the ejection speed of the tracer gas from the container 1 becomes large.
A rapid cooling phenomenon occurs inside the container 1 due to the rapid adiabatic expansion of the tracer gas T itself and the heat of evaporation when the liquefied gas vaporizes. Therefore, as the gas capacity within the container 1 decreases, the rapid cooling phenomenon inside the container 1 progresses at an accelerated pace.

このため、容器１のノズ／ｌ／（図示せず）へガス中湿
分の凝固付着が起り、トレーサガスの流ｆｔ減少等の不
安定な状態を招く。この現象は、当然トレーサガスの設
定流量の誤差となり、ひいては気体流量の測定精度に影
響を及ばずため、防止することが望ましい。そこで、必
要に応じて、容器１の周囲に、加熱装置として例えば放
射型加熱器１０を備える構成となっている。この加熱器
１０は、例えばトレーサガスとしてＳＦ６ガスを使用す
る場合、６００〜１２００Ｗ程度の電熱器であればよい
０ 尚、前記防風カバー９及び加熱器１０は、状況や条件に
応じて設置すればよく、常時設置する必要はない。As a result, moisture in the gas solidifies and adheres to the nozzle /l/ (not shown) of the container 1, leading to an unstable condition such as a decrease in the flow rate of the tracer gas. This phenomenon naturally causes an error in the set flow rate of the tracer gas, and does not affect the measurement accuracy of the gas flow rate, so it is desirable to prevent it. Therefore, if necessary, a radiant heater 10, for example, is provided as a heating device around the container 1. For example, when SF6 gas is used as a tracer gas, this heater 10 may be an electric heater of about 600 to 1200W.The windproof cover 9 and heater 10 may be installed depending on the situation and conditions. Often, it does not need to be installed all the time.

（発明の効果） 以上説明したように本発明では、トレーサガスの流量を
容器内のトレーサガスの重量変化によって測定している
ため、極めて正確に測定するこ−とができる。例えば、
従来の流量計による測定誤差は約２％程度であったが、
本発明装置による誤差は０．８％以下に抑えることがで
きた。(Effects of the Invention) As explained above, in the present invention, the flow rate of the tracer gas is measured by the change in the weight of the tracer gas in the container, so it can be measured very accurately. for example,
The measurement error with conventional flowmeters was about 2%, but
The error by the apparatus of the present invention could be suppressed to 0.8% or less.

また、容器及び１ｉ量計を防風カバーによって覆えるも
のにおいては、風の影響を排除でき、屋外の使用にも耐
えられる。In addition, in cases where the container and the 1i meter can be covered with a windproof cover, the influence of wind can be eliminated and the device can withstand outdoor use.

さらに、容器を恒温に維持できるものにおいては、トレ
ーサガスの噴出によって生じる容器内の急冷現象を防止
することができ、容器からの流量を所定量に保つことが
でき、気体流量の測定値の精度向上を助長する。Furthermore, in a container that can maintain a constant temperature, it is possible to prevent the rapid cooling phenomenon inside the container caused by the jetting of tracer gas, and it is possible to maintain the flow rate from the container at a predetermined amount, making it possible to improve the accuracy of the measured gas flow rate. Encourage improvement.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例を示すトレーサガス流入装置
及び気体配管の説明図である。 １・・・容器　　　　　　　　８・・・注入管４・・・
定流型袋（ｉ！６・・・重量計７・・・記録計　　　　
　　　９・・・防風カバー１０・・・加熱器。FIG. 1 is an explanatory diagram of a tracer gas inflow device and gas piping showing an embodiment of the present invention. 1... Container 8... Injection tube 4...
Constant flow type bag (i!6... Weight scale 7... Recorder
9... Windproof cover 10... Heater.

Claims (1)

【特許請求の範囲】 １、トレーサガスを圧入した容器を、被測定気体配管に
注入管を介して接続し、配管内にトレーサガスを注入す
る注入装置であつて、 トレーサガスを圧入した容器を載置し、この容器の重量
を一定時間毎に測定して出力する重量計と、 この重量計の出力値を積算して容器内のトレーサガスの
重量減少量を所定時間毎に記録する記録計とを備えたこ
とを特徴とする配管内気体の流量測定に用いるトレーサ
ガスの注入装置。 ２、前記被測定気体が流れる配管とトレーサガスの容器
との間を接続する注入管が、トレーサガスの注入流量を
一定に保つ定流量装置を備えることを特徴とする特許請
求の範囲第１項記載の配管内気体の流量測定に用いるト
レーサガスの注入装置。 ３、前記重量計が、重量計及び容器の周囲を覆う防風カ
バーを備えることを特徴とする特許請求の範囲第１項記
載の配管内気体の流量測定に用いるトレーサガスの注入
装置。 ４、前記トレーサガスの容器が、加熱装置を備えること
を特徴とする特許請求の範囲第１項記載の配管内気体の
流量測定に用いるトレーサガスの注入装置。[Claims] 1. An injection device that connects a container into which a tracer gas is pressurized to a gas piping to be measured via an injection pipe, and injects the tracer gas into the piping, the container into which the tracer gas is pressurized. A weighing scale that measures and outputs the weight of the container placed on the container at regular intervals, and a recorder that records the amount of weight loss of the tracer gas in the container at regular intervals by integrating the output values of this weighing scale. A tracer gas injection device used for measuring the flow rate of gas in a pipe, characterized by comprising: 2. Claim 1, characterized in that the injection pipe connecting the pipe through which the gas to be measured flows and the tracer gas container is equipped with a constant flow device that keeps the injection flow rate of the tracer gas constant. A tracer gas injection device used to measure the flow rate of the gas in the piping described above. 3. The tracer gas injection device used for measuring the flow rate of gas in a pipe according to claim 1, wherein the weighing scale includes a windproof cover that covers the weighing scale and the container. 4. The tracer gas injection device used for measuring the flow rate of gas in a pipe according to claim 1, wherein the tracer gas container is equipped with a heating device.
JP16281184A 1984-08-03 1984-08-03 Injecting device for tracer gas used for flow rate measurement of gas in pipe Granted JPS6141921A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16281184A JPS6141921A (en) 1984-08-03 1984-08-03 Injecting device for tracer gas used for flow rate measurement of gas in pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16281184A JPS6141921A (en) 1984-08-03 1984-08-03 Injecting device for tracer gas used for flow rate measurement of gas in pipe

Publications (2)

Publication Number Publication Date
JPS6141921A true JPS6141921A (en) 1986-02-28
JPH0516533B2 JPH0516533B2 (en) 1993-03-04

Family

ID=15761671

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16281184A Granted JPS6141921A (en) 1984-08-03 1984-08-03 Injecting device for tracer gas used for flow rate measurement of gas in pipe

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010101870A (en) * 2008-10-27 2010-05-06 Shibata Giken Co Ltd Wind amount measuring method in wind channel
CN109585046A (en) * 2018-12-04 2019-04-05 中国核动力研究设计院 A kind of solution injects uniformly and hands over mixing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010101870A (en) * 2008-10-27 2010-05-06 Shibata Giken Co Ltd Wind amount measuring method in wind channel
CN109585046A (en) * 2018-12-04 2019-04-05 中国核动力研究设计院 A kind of solution injects uniformly and hands over mixing device
CN109585046B (en) * 2018-12-04 2022-02-01 中国核动力研究设计院 Device for uniformly injecting and mixing solution

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