JP4847713B2 - Dimethyl ether measuring apparatus and method - Google Patents

Dimethyl ether measuring apparatus and method Download PDF

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JP4847713B2
JP4847713B2 JP2005135567A JP2005135567A JP4847713B2 JP 4847713 B2 JP4847713 B2 JP 4847713B2 JP 2005135567 A JP2005135567 A JP 2005135567A JP 2005135567 A JP2005135567 A JP 2005135567A JP 4847713 B2 JP4847713 B2 JP 4847713B2
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dimethyl ether
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三男 難波
賢治 池田
正博 山中
健 近藤
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High Pressure Gas Safety Institute of Japan
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Description

本発明は、ＬＰガス容器内の液相ＬＰガス中のジメチルエーテル濃度を測定するジメチルエーテル測定装置および方法に関するものである。   The present invention relates to a dimethyl ether measuring apparatus and method for measuring a dimethyl ether concentration in a liquid phase LP gas in an LP gas container.

新たな工業用燃料等として、数年内にジメチルエーテルが実用化される予定である。ジメチルエーテルとＬＰガスは物性が類似しているため、ＬＰガスの既存のインフラ設備を一部共用してジメチルエーテルの流通を行う予定である。そのため、ＬＰガスにジメチルエーテルが混入する場合がある。このジメチルエーテルの濃度が、一定値を超えると安全上問題が発生する可能性があるため、ＬＰガス容器中のジメチルエーテルの濃度を管理する必要がある。   Dimethyl ether will be put to practical use within a few years as a new industrial fuel. Since dimethyl ether and LP gas are similar in physical properties, dimethyl ether will be distributed by sharing a part of the existing infrastructure of LP gas. Therefore, dimethyl ether may be mixed in LP gas. If the dimethyl ether concentration exceeds a certain value, a safety problem may occur. Therefore, it is necessary to control the dimethyl ether concentration in the LP gas container.

上記のように、ＬＰガスにジメチルエーテルが混入する場合、ＬＰガスを安全に使用するためには、ジメチルエーテルの濃度管理が必要になる。しかし、容器中のＬＰガスは大部分が液相であり、一方、気相中のジメチルエーテルの濃度は温度によって変化しやすい。したがって、ジメチルエーテルについては液相中の濃度を管理する必要がある。   As described above, when dimethyl ether is mixed in LP gas, in order to use LP gas safely, it is necessary to control the concentration of dimethyl ether. However, most of the LP gas in the container is in the liquid phase, while the concentration of dimethyl ether in the gas phase is likely to change with temperature. Therefore, for dimethyl ether, it is necessary to control the concentration in the liquid phase.

ところで、この液相中のジメチルエーテル濃度を簡便に測定する技術は、未だ開発されていない。したがって、今後ジメチルエーテルが広く使われるようになったときに、安全上問題が発生することが予想され、事前の的確な対応が要請されている。   By the way, a technique for simply measuring the dimethyl ether concentration in the liquid phase has not been developed yet. Therefore, when dimethyl ether is widely used in the future, it is expected that a safety problem will occur, and an appropriate response in advance is required.

この発明は上記に鑑み提案されたもので、ＬＰガス容器中の液相中のジメチルエーテルの濃度を簡便にかつ精度良く測定して安全管理に用いることができるジメチルエーテル測定装置および方法を提供することを目的とする。   The present invention has been proposed in view of the above, and provides a dimethyl ether measuring apparatus and method that can be used for safety management by simply and accurately measuring the concentration of dimethyl ether in a liquid phase in an LP gas container. Objective.

上記目的を達成するために、請求項１に記載の発明は、ＬＰガス容器内の液相ＬＰガス中の、当該ＬＰガスとは物性が類似しているジメチルエーテル濃度を測定するジメチルエーテル測定装置において、上記ＬＰガス容器内の気相ＬＰガスをサンプリングしその気相ＬＰガス中のジメチルエーテル濃度を測定するジメチルエーテル気相濃度測定手段と、上記ジメチルエーテル気相濃度測定手段で測定して得られた気相ＬＰガス中のジメチルエーテル濃度、予め分かっているＬＰガス組成、およびＬＰガス容器の温度を用い、気液平衡を仮定し、溶液モデル法を用いて液相ＬＰガス中のジメチルエーテル濃度を演算で求めるジメチルエーテル濃度演算手段と、を備えることを特徴としている。 In order to achieve the above object, the invention described in claim 1 is a dimethyl ether measuring apparatus for measuring a dimethyl ether concentration in a liquid phase LP gas in an LP gas container and having a physical property similar to that of the LP gas . A gas phase LP obtained by sampling the gas phase LP gas in the LP gas container and measuring the dimethyl ether concentration in the gas phase LP gas, and the dimethyl ether gas phase concentration measuring unit. dimethyl ether concentration in the gas, using the temperature of LP gas composition, and LP gas container known in advance, assume a gas-liquid equilibrium, dimethyl ether concentration obtained by calculating a dimethyl ether concentration in the liquid phase LP gas using a solution model Law And an arithmetic means.

また、請求項２に記載の発明は、上記した請求項１に記載の発明の構成に加えて、上記ジメチルエーテル濃度演算手段で求めた、液相ＬＰガス中のジメチルエーテル濃度を表示する表示手段を有する、ことを特徴としている。   The invention described in claim 2 has display means for displaying the dimethyl ether concentration in the liquid phase LP gas obtained by the dimethyl ether concentration calculating means in addition to the configuration of the invention described in claim 1 above. It is characterized by that.

請求項３に記載の発明は、ＬＰガス容器内の液相ＬＰガス中の、当該ＬＰガスとは物性が類似しているジメチルエーテル濃度を測定するジメチルエーテル測定方法において、上記ＬＰガス容器内の気相ＬＰガスをサンプリングしその気相ＬＰガス中のジメチルエーテル濃度を測定し、上記測定で得られた気相ＬＰガス中のジメチルエーテル濃度、予め分かっているＬＰガス組成、およびＬＰガス容器周辺の外気温度を用い、気液平衡を仮定し、溶液モデル法を用いて液相ＬＰガス中のジメチルエーテル濃度を演算で求める、ことを特徴としている。 According to a third aspect of the present invention, there is provided a dimethyl ether measuring method for measuring a dimethyl ether concentration in a liquid phase LP gas in an LP gas container, the physical properties of which are similar to those of the LP gas, in the gas phase in the LP gas container. The LP gas is sampled and the dimethyl ether concentration in the gas phase LP gas is measured, and the dimethyl ether concentration in the gas phase LP gas obtained by the above measurement, the LP gas composition known in advance, and the outside air temperature around the LP gas container are measured. used, assuming a vapor-liquid equilibrium, determining the dimethyl ether concentration in the liquid phase LP gas in operation using a solution model method is characterized by.

この発明のジメチルエーテル測定装置および方法では、ＬＰガス容器に充填されたＬＰガスの気相中に含まれるジメチルエーテル濃度の測定結果を用いて、ＬＰガスの液相中のジメチルエーテルの濃度を求めるようにしたので、従来測定できなかった液相中のジメチルエーテルの濃度を簡便にかつ精度良く求めることができ、今後ジメチルエーテルが混入したＬＰガスが広く使われるようになっても、その安全性を的確に維持することができる。   In the dimethyl ether measuring apparatus and method of the present invention, the concentration of dimethyl ether in the liquid phase of LP gas is determined using the measurement result of the dimethyl ether concentration contained in the gas phase of LP gas filled in the LP gas container. Therefore, the concentration of dimethyl ether in the liquid phase, which could not be measured in the past, can be determined easily and accurately, and even if LP gas mixed with dimethyl ether becomes widely used in the future, its safety will be accurately maintained. be able to.

以下にこの発明の実施の形態を図面に基づいて詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１はこの発明のジメチルエーテル測定装置の全体構成を示す図である。図において、この発明のジメチルエーテル測定装置２は、ＬＰガス容器１内の液相ＬＰガスＧL中のジメチルエーテル濃度を測定する装置であり、ＬＰガス容器１内の気相ＬＰガスＧVをサンプリングしその気相ＬＰガスＧV中のジメチルエーテル濃度ＤV（以下「ＤＭＥ気相濃度ＤV」という）を測定するジメチルエーテル気相濃度測定手段（以下「ＧＭＥ気相濃度測定手段」という）２１と、そのＧＭＥ気相濃度測定手段２１で測定して得られたＤＭＥ気相濃度ＤV、予め分かっているＬＰガス組成Ｃ、およびＬＰガス容器の温度Ｔを用い、気液平衡を仮定して液相ＬＰガスＧL中のＤＭＥ濃度ＤL（以下「ＤＭＥ液相濃度ＤL」という）を演算して求めるジメチルエーテル濃度演算手段（以下ＤＭＥ濃度演算手段」という）２２と、そのＤＭＥ液相濃度ＤLを表示する表示手段２３と、を備えている。 FIG. 1 is a diagram showing the overall configuration of a dimethyl ether measuring apparatus according to the present invention. In the figure, a dimethyl ether measuring apparatus 2 according to the present invention is an apparatus for measuring the dimethyl ether concentration in the liquid phase LP gas GL in the LP gas container 1, and samples the gas phase LP gas G V in the LP gas container 1. A dimethyl ether gas phase concentration measuring means (hereinafter referred to as “GME gas phase concentration measuring means”) 21 for measuring a dimethyl ether concentration D V (hereinafter referred to as “DME gas phase concentration D V ”) in the gas phase LP gas G V ; Using the DME gas phase concentration D V obtained by measurement by the GME gas phase concentration measuring means 21, the LP gas composition C known in advance, and the temperature T of the LP gas container, the liquid phase LP is assumed assuming vapor-liquid equilibrium. and DME concentration D L (hereinafter "DME liquid phase concentration D L" hereinafter) (hereinafter referred to as DME concentration calculating means ") dimethyl ether concentration calculating means for calculating calculates the 22 in the gas G L, the Display means 23 for displaying the ME liquid phase concentration D L, and a.

ＬＰガス容器１は、ボンベ、タンク、その他各種のタイプのものを使用できる。ＬＰガス容器１に充填されるＬＰガスは、プロパン、ブタン、イソブタン、エタンの４成分のうちの少なくとも１成分からなり、そのＬＰガス組成（プロパン、ブタン、イソブタン、エタンの混入割合）Ｃは予め分かっている値である。   The LP gas container 1 can be a cylinder, a tank, or other various types. The LP gas filled in the LP gas container 1 is composed of at least one of the four components propane, butane, isobutane, and ethane, and the LP gas composition (mixing ratio of propane, butane, isobutane, and ethane) C is set in advance. This is a known value.

上記のＤＭＥ気相濃度測定手段２１は、サンプリングした気相ＬＰガスＧVを物理的、化学的に処理してＤＭＥ気相濃度ＤVを実測する、通常使用される測定装置であり、その計測結果はＤＭＥ濃度演算手段２２に出力される。 Additional DME vapor concentration measuring means 21, a physical vapor phase LP gas G V sampled and chemically processed to actually measure the DME vapor concentration D V, a measurement apparatus which is normally used, the measurement The result is output to the DME concentration calculation means 22.

ＤＭＥ濃度演算手段２２は、コンピュータに構築され、メモリに格納された本発明に係るソフトウェアに従ってＣＰＵが動作する機能を含めて構成されている。上記のＤＭＥ気相濃度測定手段２１が計測したＤＭＥ気相濃度ＤVは、このＤＭＥ濃度演算手段２２のメモリに記憶され、メモリに記憶されたＤＭＥ気相濃度ＤVの値が更新されると、ＤＭＥ濃度演算手段２２は自動的に演算を開始するようになっている。 The DME concentration calculation means 22 is constructed in a computer and includes a function for operating the CPU in accordance with software according to the present invention stored in a memory. The DME gas phase concentration D V measured by the DME gas phase concentration measuring means 21 is stored in the memory of the DME concentration calculating means 22, and the value of the DME gas phase concentration D V stored in the memory is updated. The DME concentration calculation means 22 automatically starts calculation.

上記のＬＰガス組成Ｃの値は、演算の実行時にＤＭＥ濃度演算手段２２に手動で外部入力する。あるいは予めＤＭＥ濃度演算手段２２のメモリに、複数の組成データとして記憶保存させておき、演算実行時にその複数の組成データから該当するＬＰガス組成を読み出して使用する。   The value of the LP gas composition C is manually input to the DME concentration calculating means 22 at the time of execution of the calculation. Alternatively, it is stored in advance in the memory of the DME concentration calculation means 22 as a plurality of composition data, and the corresponding LP gas composition is read from the plurality of composition data and used at the time of execution of the calculation.

上記の温度Ｔは容器内の温度が好ましいが、容器周辺の外気温度でもよく、上記のＬＰガス組成Ｃの場合と同様に、演算実行時にＤＭＥ濃度演算手段２２に手動で外部入力するか、あるいは予めＤＭＥ濃度演算手段２２のメモリに、複数の温度データとして記憶保存させておき、演算実行時にその複数の温度データから該当する温度を読み出して使用する。   The temperature T is preferably the temperature inside the container, but it may be the outside air temperature around the container. As in the case of the LP gas composition C, the temperature T may be manually input externally to the DME concentration calculation means 22 or A plurality of temperature data are stored and stored in advance in the memory of the DME concentration calculation means 22, and the corresponding temperatures are read out from the plurality of temperature data and used at the time of calculation execution.

上記の表示手段２３は、ＤＭＥ濃度演算手段２２が求めたＤＭＥ液相濃度ＤLの値を、例えば液晶画面に表示する。 It said display means 23, the value of the DME concentration calculating means 22 obtained DME liquid phase concentration D L, for example, displayed on the LCD screen.

次にＤＭＥ濃度演算手段２２が行う演算手順を図２を用いて説明する。   Next, the calculation procedure performed by the DME concentration calculation means 22 will be described with reference to FIG.

図２はＤＭＥ濃度演算手段が行う演算手順を示すフローチャートである。ＤＭＥ濃度演算手段２２は、本発明に係るプログラムに従って下記の手順でＤＭＥ液相濃度ＤLを求める。 FIG. 2 is a flowchart showing a calculation procedure performed by the DME concentration calculation means. DME concentration calculating means 22 calculates a DME liquid phase concentration D L the following procedure in accordance with a program according to the present invention.

先ずステップＳ１において、変数の初期化を行う。   First, in step S1, variables are initialized.

次にステップＳ２において、ＤＭＥ気相濃度測定手段２１で計測されたＤＭＥ気相濃度ＤVを入手する。 In step S2, to obtain measured by the DME vapor concentration measuring means 21 DME vapor concentration D V.

次にステップＳ３において、ＬＰガス容器の温度Ｔを、手入力で、またはメモリに予め登録されているテーブルのデータから選択して入力する。   Next, in step S3, the temperature T of the LP gas container is input manually or selected from data in a table registered in advance in the memory.

続いてステップＳ４において、ＬＰガス容器１に充填されているＬＰガスの組成Ｃを、手入力で、またはメモリに予め登録されている組成テーブルの複数データの中から選択して入力する。   Subsequently, in step S4, the composition C of the LP gas filled in the LP gas container 1 is manually input or selected from a plurality of data in the composition table registered in advance in the memory.

ステップＳ５において、演算に用いるＷｉｌｓｏｎパラメータの入力が行われる。   In step S5, Wilson parameters used for calculation are input.

次にステップＳ６において、各種入力パラメータのエラーチェックを行う。エラーがなければ続いてステップＳ７において、ＤＭＥ液相濃度ＤLを求めるための演算を行う。この演算についての詳細は後述する。 Next, in step S6, an error check of various input parameters is performed. In Step S7 is followed if there is no error, performs computation for obtaining the DME solution phase concentration D L. Details of this calculation will be described later.

次にステップＳ８において、演算結果の収束判定を行い、収束していなければステップＳ７に戻り、収束していればステップＳ９に進む。   Next, in step S8, the convergence determination of the calculation result is performed. If not converged, the process returns to step S7, and if converged, the process proceeds to step S9.

ステップＳ９では、演算結果のＤＭＥ液相濃度ＤLを出力し、必要に応じて画面表示し、その後このプログラムを終了する。 In step S9, and outputs the DME solution phase concentration D L of the operation result, the screen displays as necessary, then this program is ended.

上記のステップＳ７において行われるＤＭＥ液相濃度ＤLを求める演算は、概略次のように行う。ＬＰガス容器１内における気相・液相は気液平衡状態であると仮定し、ＤＭＥ気相濃度ＤV等の入力データから液相組成を計算する。気液平衡の計算方法としては、比較的計算量の少ない溶液モデル法（活量係数式）を用いた。溶液モデル法の中でも、比較的精度が高く、広く用いられているウイルソン（Ｗｉｌｓｏｎ）法を用いた。これにより、ジメチルエーテル測定装置をオペレータが携帯可能な装置として構成した場合でも、その装置に搭載できるような低速のマイコンで動作させることができるようになる。 Calculation for obtaining the DME solution phase concentration D L that is performed in step S7 in the above is carried out as outlined below. Vapor-liquid phase in the LP gas container 1 is assumed to be a gas-liquid equilibrium, to calculate the liquid phase composition from the input data such as DME vapor concentration D V. As a method for calculating the vapor-liquid equilibrium, a solution model method (activity coefficient equation) with a relatively small amount of calculation was used. Among the solution model methods, the Wilson method, which has relatively high accuracy and is widely used, was used. Thereby, even when the dimethyl ether measuring device is configured as a device that can be carried by an operator, it can be operated by a low-speed microcomputer that can be mounted on the device.

理想気体を仮定した場合、成分ｉの液相および気相のモル分率（ｘ、ｙ）の間には次式（１）が成り立つ。

Figure 0004847713
Assuming an ideal gas, the following equation (1) holds between the liquid phase and gas phase mole fractions (x, y) of component i.
Figure 0004847713

ここでγは活量係数である。   Here, γ is an activity coefficient.

理想気体では２成分系Ｗｉｌｓｏｎ式を用いた場合、気相中のＤＭＥのモル分率ｙ3は、式（１）を用いると、次式（２）のように表すことができる。

Figure 0004847713
When the two-component Wilson equation is used for an ideal gas, the molar fraction y 3 of DME in the gas phase can be expressed by the following equation (2) using equation (1).
Figure 0004847713

ここで、ＤＭＥ、プロパン、ブタン、イソブタンおよびエタンの５成分から構成される系において、エタン、プロパン、ＤＭＥ、イソブタン、ブタンの成分をそれぞれ添え字１，２，３，４，５で表すこととする。   Here, in a system composed of five components of DME, propane, butane, isobutane and ethane, the components of ethane, propane, DME, isobutane and butane are represented by subscripts 1, 2, 3, 4, and 5, respectively. To do.

ジメチルエーテル（ＤＭＥ）混入後の液相中のエタン、プロパン、イソブタン、ブタンのモル分率ｘ1，ｘ2，ｘ4，ｘ5は、ＤＭＥ混入前の液相中のエタン、プロパン、イソブタン、ブタンのモル分率をｘ1'，ｘ2'，ｘ4'，ｘ5'（既知）とすると、次式（３）のように表すことができると仮定する。

Figure 0004847713
The molar fractions x 1 , x 2 , x 4 and x 5 of ethane, propane, isobutane and butane in the liquid phase after mixing with dimethyl ether (DME) are ethane, propane, isobutane and butane in the liquid phase before mixing with DME. Assuming that the mole fraction of x 1 ′, x 2 ′, x 4 ′, and x 5 ′ (known) can be expressed as the following equation (3).
Figure 0004847713

ここで、ｋは比例定数であり、液相中のＬＰガスの組成割合の変化は、ＤＭＥの混入前と混入後とで無視できると仮定することにより導入した。上記の式（３）を用いて、液相中のＤＭＥのモル分率ｘ3は、次式（４）で表すことができる。

Figure 0004847713
Here, k is a proportionality constant, and the change in the composition ratio of LP gas in the liquid phase was introduced by assuming that it can be ignored before and after the DME mixing. Using the above formula (3), the molar fraction x 3 of DME in the liquid phase can be expressed by the following formula (4).
Figure 0004847713

ＤＭＥ混入前の液相中の各成分のモル分率に関してもｘ1'＋ｘ2'＋ｘ4'＋ｘ5'＝１が成り立つ。式（３）および式（４）を、次式（５）のＷｉｌｓｏｎ式に代入して反復法で解くことにより、液相中のＤＭＥのモル分率を求める。

Figure 0004847713
X 1 ′ + x 2 ′ + x 4 ′ + x 5 ′ = 1 holds with respect to the molar fraction of each component in the liquid phase before mixing with DME. The molar fraction of DME in the liquid phase is obtained by substituting Equation (3) and Equation (4) into the Wilson equation of the following Equation (5) and solving by an iterative method.
Figure 0004847713

上記のようにして求めた液相中のＤＭＥのモル分率（ＤＭＥ液相濃度ＤL（計算値））と、気液平衡データのＤＭＥ液相濃度ＤL（気液平衡状態にある混合物の気相、液相を採取して、ガスクロ等で組成を分析することにより測定された実測値）と比較し、計算精度を検証した。プロパンにジメチルエーテルが混入している場合、ブタンにジメチルエーテルが混入している場合、イソブタンにジメチルエーテルが混入している場合、プロパンとブタンからなるＬＰガスにジメチルエーテルが混入している場合等、種々のＬＰガスにジメチルエーテルが混入している場合について求めた結果、その何れの場合でも実験値と計算値とは高い精度で一致した。 The molar fraction of DME in the liquid phase obtained as described above (DME liquid phase concentration D L (calculated value)) and the DME liquid phase concentration D L of the gas-liquid equilibrium data (the mixture in the gas-liquid equilibrium state) The gas phase and the liquid phase were collected and compared with the actual measurement values measured by analyzing the composition with a gas chromatograph or the like, and the calculation accuracy was verified. Various LPs such as dimethyl ether mixed in propane, dimethyl ether mixed in butane, dimethyl ether mixed in isobutane, dimethyl ether mixed in LP gas consisting of propane and butane, etc. As a result of obtaining the case where dimethyl ether was mixed in the gas, the experimental value and the calculated value coincided with high accuracy in any case.

以上述べたように、この発明のジメチルエーテル測定装置２では、ＬＰガス容器１に充填されたＬＰガスの気相中に含まれるＤＭＥ気相濃度ＤVの測定結果を用いて、ＬＰガス液相中のＤＭＥ液相濃度ＤLを求めるようにしたので、従来測定が困難であった液相中のジメチルエーテルの濃度を簡便にかつ精度良く求めることができる。したがって、今後ジメチルエーテルが混入したＬＰガスが広く使われるようになっても、この液相中のジメチルエーテルの濃度を用いてその安全性を的確に維持することができる。 As described above, in dimethyl measuring apparatus 2 of the present invention, using the measurement results of the DME vapor concentration D V contained gas phase of the LP gas filled in LP gas container 1, LP gas liquid phase since to obtain the DME solution phase concentration D L, it is possible to conventional measurements determined simply and accurately the concentration of dimethyl ether in the liquid phase was difficult. Therefore, even if LP gas mixed with dimethyl ether is widely used in the future, the safety of the gas can be accurately maintained by using the concentration of dimethyl ether in the liquid phase.

なお、上記の説明では、液相中のジメチルエーテルの濃度の演算を溶液モデル法を用いて行うようにしたが、本発明はこの溶液モデル法に限定されず、様々の演算手法に対して同様に適用することができる。   In the above description, the calculation of the concentration of dimethyl ether in the liquid phase is performed using the solution model method. However, the present invention is not limited to this solution model method, and is similarly applied to various calculation methods. Can be applied.

この発明のジメチルエーテル測定装置の全体構成を示す図である。It is a figure which shows the whole structure of the dimethyl ether measuring apparatus of this invention. ジメチルエーテル濃度演算手段が行う演算手順を示すフローチャートである。It is a flowchart which shows the calculation procedure which a dimethyl ether density | concentration calculating means performs.

符号の説明Explanation of symbols

１ ガス容器
２ ジメチルエーテル測定装置
２１ ジメチルエーテル気相濃度測定手段
２２ ジメチルエーテル濃度演算手段
２３ 表示手段
Ｃ ＬＰガス組成
ＤL ジメチルエーテル液相濃度
ＤV ジメチルエーテル気相濃度 1 gas container 2 dimethyl ether detecting device (21) dimethyl ether gas phase density measuring device 22 dimethyl ether concentration calculating means 23 display means C LP gas composition D L ether solution phase concentration D V dimethyl ether gas phase concentration

Claims (3)

ＬＰガス容器内の液相ＬＰガス中の、当該ＬＰガスとは物性が類似しているジメチルエーテル濃度を測定するジメチルエーテル測定装置において、
上記ＬＰガス容器内の気相ＬＰガスをサンプリングしその気相ＬＰガス中のジメチルエーテル濃度を測定するジメチルエーテル気相濃度測定手段と、
上記ジメチルエーテル気相濃度測定手段で測定して得られた気相ＬＰガス中のジメチルエーテル濃度、予め分かっているＬＰガス組成、およびＬＰガス容器の温度を用い、気液平衡を仮定し、溶液モデル法を用いて液相ＬＰガス中のジメチルエーテル濃度を演算で求めるジメチルエーテル濃度演算手段と、
を備えることを特徴とするジメチルエーテル測定装置。 In the dimethyl ether measuring device for measuring the dimethyl ether concentration in the liquid phase LP gas in the LP gas container, the physical properties of which are similar to the LP gas ,
Dimethyl ether gas phase concentration measuring means for sampling the gas phase LP gas in the LP gas container and measuring the dimethyl ether concentration in the gas phase LP gas;
Solution model method assuming vapor-liquid equilibrium using dimethyl ether concentration in gas phase LP gas obtained by the above dimethyl ether gas phase concentration measuring means, LP gas composition known in advance, and temperature of LP gas container dimethyl ether concentration calculating means for calculating a dimethyl ether concentration in the liquid phase LP gas in operation using,
A dimethyl ether measuring device comprising: 上記ジメチルエーテル濃度演算手段で求めた、液相ＬＰガス中のジメチルエーテル濃度を表示する表示手段を有する、請求項１に記載のジメチルエーテル測定装置。   The dimethyl ether measuring apparatus according to claim 1, further comprising display means for displaying the dimethyl ether concentration in the liquid phase LP gas obtained by the dimethyl ether concentration calculating means. ＬＰガス容器内の液相ＬＰガス中の、当該ＬＰガスとは物性が類似しているジメチルエーテル濃度を測定するジメチルエーテル測定方法において、
上記ＬＰガス容器内の気相ＬＰガスをサンプリングしその気相ＬＰガス中のジメチルエーテル濃度を測定し、
上記測定で得られた気相ＬＰガス中のジメチルエーテル濃度、予め分かっているＬＰガス組成、およびＬＰガス容器周辺の外気温度を用い、気液平衡を仮定し、溶液モデル法を用いて液相ＬＰガス中のジメチルエーテル濃度を演算で求める、
ことを特徴とするジメチルエーテル測定方法。 In the dimethyl ether measurement method for measuring the dimethyl ether concentration in the liquid phase LP gas in the LP gas container, the physical properties of which are similar to the LP gas ,
Sampling the gas phase LP gas in the LP gas container and measuring the dimethyl ether concentration in the gas phase LP gas,
Using the solution model method and the liquid phase LP , assuming the vapor-liquid equilibrium using the dimethyl ether concentration in the gas phase LP gas obtained in the above measurement, the LP gas composition known in advance, and the outside air temperature around the LP gas container. Request dimethyl ether concentration in the gas in the operation,
A method for measuring dimethyl ether.
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