JPH06186182A - Method for measuring hydrogen gas concentration in city gas with known calorific value - Google Patents
Method for measuring hydrogen gas concentration in city gas with known calorific valueInfo
- Publication number
- JPH06186182A JPH06186182A JP34005192A JP34005192A JPH06186182A JP H06186182 A JPH06186182 A JP H06186182A JP 34005192 A JP34005192 A JP 34005192A JP 34005192 A JP34005192 A JP 34005192A JP H06186182 A JPH06186182 A JP H06186182A
- Authority
- JP
- Japan
- Prior art keywords
- hydrogen gas
- calorific value
- gas concentration
- measured
- city gas
- 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
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- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、熱量が既知の都市ガス
中の水素ガス濃度を測定するための方法に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring hydrogen gas concentration in city gas having a known calorific value.
【０００２】[0002]
【従来の技術】都市ガス中の水素ガス成分は、ガスエン
ジン等の圧縮、爆発燃焼時の燃焼性に影響を与えるとい
われている。従ってガスエンジンや精密バーナ等の燃焼
制御では、都市ガス中の水素ガス濃度を測定することが
必要となって来る。2. Description of the Related Art It is said that the hydrogen gas component in city gas affects the combustibility of a gas engine or the like during compression and explosive combustion. Therefore, in combustion control of gas engines, precision burners, etc., it is necessary to measure the hydrogen gas concentration in city gas.
【０００３】都市ガス中の水素ガス濃度を測定するため
の従来の代表的な方法としては、１ ガスクロマトグラ
フィー法、 接触燃焼式センサや半導体式センサ等の
水素ガスセンサ、 ヘンペル式ガス分析法等がある。As typical conventional methods for measuring the hydrogen gas concentration in city gas, there are a 1 gas chromatography method, a hydrogen gas sensor such as a catalytic combustion type sensor and a semiconductor type sensor, and a Hempel type gas analysis method. is there.
【０００４】一方、都市ガスの熱量計として、被測定都
市ガスを、直列に接続した熱式流量計と層流流量計に流
し、熱式流量計の出力を一定にしながら層流流量計の圧
力損失を測定して、この圧力損失と熱量との対応関係に
より都市ガスの熱量を測定する熱量計が提案されてい
る。例えば特開平4-89538号公報や特願平3-335696号の
願書に添付された明細書及び図面を参照のこと。On the other hand, as a calorimeter of city gas, the city gas to be measured is caused to flow through a thermal type flow meter and a laminar flow meter connected in series, and the pressure of the laminar flow meter is kept constant while keeping the output of the thermal type flow meter constant. A calorimeter has been proposed which measures loss and measures the calorific value of city gas based on the correspondence between the pressure loss and the calorific value. See, for example, the specification and drawings attached to the applications of JP-A-4-89538 and Japanese Patent Application No. 3-335696.
【０００５】[0005]
【発明が解決しようとする課題】上記の水素ガス濃度測
定方法では、以下に示すような課題がある。の方法で
は、連続測定が不可能で、機構も複雑である。の方法
では、空気との混合操作が必要であると共に、水素ガス
以外の組成の変動による影響が大きい。の方法では、
煩雑な手作業による操作が必要であると共に、化学薬品
類を必要とする。本発明は、このような従来の水素ガス
濃度測定方法の課題を、上述した熱量計を合理的に利用
して解決するものである。The above hydrogen gas concentration measuring method has the following problems. However, continuous measurement is impossible and the mechanism is complicated. The method of (1) requires a mixing operation with air, and is greatly affected by fluctuations in the composition other than hydrogen gas. In the method of
It requires complicated manual operations and chemicals. The present invention solves the problems of the conventional hydrogen gas concentration measuring method by rationally utilizing the calorimeter described above.
【０００６】[0006]
【課題を解決するための手段】上述した課題を解決する
ために、本発明では、被測定都市ガスを、直列に接続し
た熱式流量計と層流流量計に流し、熱式流量計の出力を
一定にしながら層流流量計の圧力損失を測定して、この
圧力損失と熱量との対応関係により都市ガスの熱量を測
定する熱量計を利用し、この熱量計により、熱量が既知
の都市ガスの熱量を測定して、その測定値と水素ガス濃
度との対応関係により水素ガス濃度を測定する方法を提
案する。In order to solve the above-mentioned problems, in the present invention, the city gas to be measured is passed through a thermal type flow meter and a laminar flow meter connected in series, and the output of the thermal type flow meter is output. Using a calorimeter that measures the pressure loss of the laminar flow meter while keeping the temperature constant, and measures the calorific value of the city gas by the correspondence relationship between this pressure loss and the calorific value. We propose a method of measuring the amount of heat of hydrogen and measuring the hydrogen gas concentration by the correspondence between the measured value and the hydrogen gas concentration.
【０００７】具体的には、この水素ガス濃度は、測定値
と既知の値との差と水素ガス濃度との対応関係により導
出する。Specifically, the hydrogen gas concentration is derived from the correspondence between the difference between the measured value and the known value and the hydrogen gas concentration.
【０００８】[0008]
【作用】特開平4-89538号公報に開示されている熱量計
により都市ガスの熱量を測定する場合、都市ガス中に水
素ガスが含まれると、熱量と圧力損失との対応関係がず
れてしまい、正確な熱量が測定できなくなる。そこで、
特願平3-335696号の願書に添付された明細書及び図面に
開示されている熱量計では、上記熱量計の構成に加えて
水素ガス濃度を測定する検知器を設け、上記圧力損失と
の対応関係により得られた熱量を検知器により測定した
水素ガス濃度により補正して熱量の測定値を得ている。[Function] When the heat quantity of city gas is measured by the calorimeter disclosed in JP-A-4-89538, if hydrogen gas is contained in the city gas, the correspondence relationship between the heat quantity and the pressure loss shifts. , The accurate amount of heat cannot be measured. Therefore,
In the calorimeter disclosed in the specification and the drawings attached to the application of Japanese Patent Application No. 3-335696, in addition to the configuration of the calorimeter, a detector for measuring hydrogen gas concentration is provided, and the pressure loss The calorific value obtained from the correspondence is corrected by the hydrogen gas concentration measured by the detector to obtain the calorific value.
【０００９】このように上記の熱量計では水素ガス濃度
により熱量の測定値が変化することから、熱量の測定
値、またはその関連量と水素ガス濃度との対応関係が１
対１に定まれば、熱量の測定値から水素ガス濃度を求め
ることができる。As described above, in the above calorimeter, since the measured value of the calorific value changes depending on the hydrogen gas concentration, the correspondence between the measured value of the calorific value or its related amount and the hydrogen gas concentration is 1.
If the ratio is set to 1, the hydrogen gas concentration can be calculated from the measured amount of heat.
【００１０】即ち、熱量が既知の都市ガス中に水素ガス
が含まれている場合、このような混合ガスの熱量を上記
の熱量計で測定すると、熱量の測定値は水素ガス濃度に
応じて変化し、１対１の対応関係が得られる。従って、
この対応関係を予めの測定、または理論計算により求め
ておけば、熱量の測定値から水素ガス濃度を導出するこ
とができる。That is, when hydrogen gas is contained in city gas of known calorific value, when the calorific value of such a mixed gas is measured by the calorimeter, the measured calorific value changes according to the hydrogen gas concentration. Then, a one-to-one correspondence is obtained. Therefore,
If this correspondence is obtained in advance by measurement or theoretical calculation, the hydrogen gas concentration can be derived from the measured value of the amount of heat.
【００１１】[0011]
【実施例】次に本発明の実施例を説明する。図１は本発
明の方法に適用する熱量計の構成の一例を示す系統図で
あり、この熱量計は上述した公報等に開示されるものと
同様の構成である。符号１は被測定都市ガスを流すライ
ン、即ちサンプルガスラインで、上流側から下流側に、
順次、減圧弁２、圧力計３、フイルタ４、流量制御弁
５、熱式流量計（または質量流量計）６、層流流量計
（または体積流量計）７を設けている。８は演算器、９
はコントローラーであり、このコントローラー９は演算
器８からの流量設定信号と熱式流量計６からの流量信号
に基づいて流量制御弁５を制御する。層流流量計７には
差圧計１０を設けており、この差圧計１０からの差圧信
号ΔＰは演算器８に入力される。また符号１１は圧力
計、１２は温度計である。EXAMPLES Examples of the present invention will be described below. FIG. 1 is a system diagram showing an example of the configuration of a calorimeter applied to the method of the present invention. This calorimeter has the same configuration as that disclosed in the above-mentioned publications and the like. Reference numeral 1 is a line through which the city gas to be measured flows, that is, a sample gas line, from the upstream side to the downstream side,
A pressure reducing valve 2, a pressure gauge 3, a filter 4, a flow control valve 5, a thermal type flow meter (or mass flow meter) 6, and a laminar flow meter (or volume flow meter) 7 are sequentially provided. 8 is a computing unit, 9
Is a controller, and this controller 9 controls the flow rate control valve 5 based on the flow rate setting signal from the calculator 8 and the flow rate signal from the thermal type flow meter 6. The laminar flow meter 7 is provided with a differential pressure gauge 10, and the differential pressure signal ΔP from the differential pressure gauge 10 is input to the calculator 8. Reference numeral 11 is a pressure gauge, and 12 is a thermometer.
【００１２】熱式流量計６は図示は省略しているが、流
路に設けたヒータの上流側と下流側に温度センサとして
の抵抗線を設置し、これらのブリッジ回路の出力として
質量流量に比例した電圧値を求めるものであり、また層
流流量計７は上記差圧計１０により上流側と下流側の所
定の位置間の差圧を求めるものである。Although not shown in the figure, the thermal type flow meter 6 has resistance wires as temperature sensors installed upstream and downstream of the heater provided in the flow path, and outputs the mass flow rate as the output of these bridge circuits. The laminar flow meter 7 obtains a proportional voltage value, and the differential pressure gauge 10 obtains a differential pressure between predetermined positions on the upstream side and the downstream side.
【００１３】以上の構成において、熱式流量計６の出力
を一定にしながら層流流量計７の圧力損失、即ち差圧を
測定して、この差圧と熱量との対応関係により都市ガス
の熱量を測定することができる。即ち、熱式流量計６の
出力を一定にしながら層流流量計７の差圧を測定する
と、この差圧ΔＰと熱量Ｈとは次の（１）式に示す関係
式で表される。 Ｈ＝Ｋ／｛ΔＰ（１＋Ｐ2／Ｐ1）｝ ………（１） 但し、Ｋは定数、Ｐ1，Ｐ2は層流流量計の流入側、流出
側圧力である。In the above construction, the pressure loss of the laminar flow meter 7, that is, the differential pressure is measured while the output of the thermal type flow meter 6 is kept constant, and the calorific value of city gas is determined by the correspondence relationship between the differential pressure and the calorific value. Can be measured. That is, when the differential pressure of the laminar flow meter 7 is measured while keeping the output of the thermal type flow meter 6 constant, the differential pressure ΔP and the heat quantity H are expressed by the relational expression shown in the following expression (1). H = K / {ΔP (1 + P 2 / P 1 )} (1) where K is a constant and P 1 and P 2 are inflow and outflow pressures of the laminar flow meter.
【００１４】以上の熱量計により、既知の熱量11,254kc
al/Nm3の都市ガスに水素ガスを混合して熱量を測定した
結果を図２の実線で示す。この実施結果に示すように、
都市ガスに混入している水素ガスの濃度が高くなるほど
熱量計の出力は低くなって行き、図中破線で示す熱量1
1,254kcal/Nm3の熱量との差は、水素ガスの濃度に対し
て、ほぼ１次曲線で表せる。With the above calorimeter, a known calorific value of 11,254 kc
The solid line in Fig. 2 shows the result of measuring the calorific value by mixing hydrogen gas with al / Nm 3 of city gas. As shown in the results of this implementation,
The higher the concentration of hydrogen gas mixed in the city gas, the lower the calorimeter output.
The difference from the calorific value of 1,254 kcal / Nm 3 can be expressed by a linear curve with respect to the concentration of hydrogen gas.
【００１５】従って、このような対応関係を利用すれ
ば、熱量計の出力から水素ガスの濃度を導出することが
できる。このような水素ガス濃度の導出は、対応関係を
予めの測定または理論計算により求めて演算器８に、関
数式またはデータテーブルとして記憶しておき、容易に
演算することができる。Therefore, by utilizing such correspondence, the hydrogen gas concentration can be derived from the output of the calorimeter. Such derivation of the hydrogen gas concentration can be easily calculated by calculating the correspondence by preliminary measurement or theoretical calculation and storing it in the calculator 8 as a functional expression or a data table.
【００１６】[0016]
【発明の効果】本発明は以上の通りであるので、従来の
水素ガス濃度測定方法と比較して次のような効果があ
る。 ガスクロマトグラフィー法と比較して、簡単な構成
で連続測定が可能である。 水素ガスセンサを用いる場合のように空気との混合
操作が不要となる。 ヘンペル式ガス分析法では必要な煩雑な手作業や化
学薬品類を必要としない。As described above, the present invention has the following effects as compared with the conventional hydrogen gas concentration measuring method. Compared with the gas chromatography method, continuous measurement is possible with a simple structure. There is no need for a mixing operation with air as in the case of using a hydrogen gas sensor. Hempel gas analysis does not require the cumbersome manual labor and chemicals required.
【図１】本発明の測定方法に適用する熱量計の構成を示
す系統図である。FIG. 1 is a system diagram showing a configuration of a calorimeter applied to a measuring method of the present invention.
【図２】本発明により測定した結果の一例を示すもので
ある。FIG. 2 shows an example of a result measured by the present invention.
１ サンプルガスライン ２ 減圧弁 ３ 圧力計 ４ フイルタ ５ 流量制御弁 ６ 熱式流量計 ７ 層流流量計 ８ 演算器 ９ コントローラー １０ 差圧計 １１ 圧力計 １２ 温度計 1 sample gas line 2 pressure reducing valve 3 pressure gauge 4 filter 5 flow control valve 6 thermal type flow meter 7 laminar flow meter 8 computing unit 9 controller 10 differential pressure gauge 11 pressure gauge 12 thermometer
Claims (2)
流量計と層流流量計に流し、熱式流量計の出力を一定に
しながら層流流量計の圧力損失を測定して、この圧力損
失と熱量との対応関係により都市ガスの熱量を測定する
熱量計を利用し、この熱量計により、熱量が既知の都市
ガスの熱量を測定して、その測定値と水素ガス濃度との
対応関係により水素ガス濃度を導出することを特徴とす
る熱量が既知の都市ガス中の水素ガス濃度測定方法1. The city gas to be measured is caused to flow through a thermal flow meter and a laminar flow meter connected in series, and the pressure loss of the laminar flow meter is measured while the output of the thermal flow meter is kept constant. Using a calorimeter that measures the calorific value of city gas based on the relationship between pressure loss and calorific value, this calorimeter measures the calorific value of city gas of known calorific value, and the measured value corresponds to the hydrogen gas concentration. Method for measuring hydrogen gas concentration in city gas with known calorific value, characterized by deriving hydrogen gas concentration from relationship
濃度は、測定値と既知の値との差と水素ガス濃度との対
応関係により導出することを特徴とする熱量が既知の都
市ガス中の水素ガス濃度測定方法2. The method according to claim 1, wherein the hydrogen gas concentration is derived from a correspondence relationship between the difference between the measured value and the known value and the hydrogen gas concentration, in a city gas of known calorific value. Method for measuring hydrogen gas concentration
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34005192A JPH06186182A (en) | 1992-12-21 | 1992-12-21 | Method for measuring hydrogen gas concentration in city gas with known calorific value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34005192A JPH06186182A (en) | 1992-12-21 | 1992-12-21 | Method for measuring hydrogen gas concentration in city gas with known calorific value |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06186182A true JPH06186182A (en) | 1994-07-08 |
Family
ID=18333257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34005192A Pending JPH06186182A (en) | 1992-12-21 | 1992-12-21 | Method for measuring hydrogen gas concentration in city gas with known calorific value |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06186182A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011158408A (en) * | 2010-02-03 | 2011-08-18 | Riken Keiki Co Ltd | Calorimetric apparatus and calorimetry |
| JP2012214336A (en) * | 2011-03-31 | 2012-11-08 | Osaka Gas Co Ltd | Reforming system |
| JP7129580B1 (en) * | 2022-04-11 | 2022-09-01 | 東京瓦斯株式会社 | Hydrogen gas concentration meter |
| WO2024066459A1 (en) * | 2022-09-30 | 2024-04-04 | 上海飞奥燃气设备有限公司 | Method and system for controlling hydrogen doping concentration in natural gas in fuel gas pipeline |
-
1992
- 1992-12-21 JP JP34005192A patent/JPH06186182A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011158408A (en) * | 2010-02-03 | 2011-08-18 | Riken Keiki Co Ltd | Calorimetric apparatus and calorimetry |
| JP2012214336A (en) * | 2011-03-31 | 2012-11-08 | Osaka Gas Co Ltd | Reforming system |
| JP7129580B1 (en) * | 2022-04-11 | 2022-09-01 | 東京瓦斯株式会社 | Hydrogen gas concentration meter |
| WO2024066459A1 (en) * | 2022-09-30 | 2024-04-04 | 上海飞奥燃气设备有限公司 | Method and system for controlling hydrogen doping concentration in natural gas in fuel gas pipeline |
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