WO2016104270A1 - Procédé de calcul d'indice de méthane et dispositif de détermination d'indice de méthane - Google Patents

Procédé de calcul d'indice de méthane et dispositif de détermination d'indice de méthane Download PDF

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WO2016104270A1
WO2016104270A1 PCT/JP2015/085177 JP2015085177W WO2016104270A1 WO 2016104270 A1 WO2016104270 A1 WO 2016104270A1 JP 2015085177 W JP2015085177 W JP 2015085177W WO 2016104270 A1 WO2016104270 A1 WO 2016104270A1
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value
methane number
gas
measurement target
target gas
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PCT/JP2015/085177
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Japanese (ja)
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智生 石黒
謙一 小嶋
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理研計器株式会社
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Priority to JP2016566149A priority Critical patent/JP6702885B2/ja
Publication of WO2016104270A1 publication Critical patent/WO2016104270A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/22—Fuels; Explosives
    • G01N33/225—Gaseous fuels, e.g. natural gas
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K17/00—Measuring quantity of heat

Definitions

  • the present invention relates to a methane number calculating method and a methane number measuring apparatus.
  • LNG liquefied natural gas
  • NO x nitrogen oxides
  • CO 2 emission nitrogen oxides
  • problems related to commercialization of ships using LNG include the composition of fuel gas due to the fact that the composition of LNG differs depending on the place of production, and that the amount of fuel gas consumed varies when the gas engine starts up and when the load fluctuates. There are points that change. If the composition of the fuel gas changes, characteristics such as the calorific value and methane number of the fuel gas change, which may cause abnormal combustion such as engine knocking or misfire.
  • the methane number is an index indicating a resistance value against knocking corresponding to the octane number of a gasoline engine, and is an index evaluated with pure methane as 100 and hydrogen as 0.
  • a method for measuring the calorific value of fuel gas such as LNG for example, a method of measuring a physical property value having a specific correspondence relationship with the calorific value and obtaining a calorific value (converted calorie value) based on the measured value is applied. It has been proposed by a person (for example, see Patent Document 1).
  • a method of calculating the methane number of fuel gas (A) A method proposed by AVL (hereinafter also referred to as “AVL standard”), (B) A method of calculating by a specific arithmetic expression defined by the California Air Resources Council (hereinafter also referred to as “CARB standard”), (C) A method of calculating by a method based on ISO / TR 22302 3.1.1 (hereinafter also referred to as “GRI (Lc) standard”), (D) A method of calculating by a method based on ISO / TR 22302 3.1.2 (hereinafter also referred to as “GRI (H / C) standard”).
  • CARB standard California Air Resources Council
  • the methane number shows a different value depending on the calculation method even for the same fuel gas. For example, a methane number based on a different standard for each region is required.
  • both methods calculate the methane number based on the gas composition, as described above, when the gas composition fluctuates, the gas composition is measured when calculating the methane number. Is required.
  • LNG vaporized gas a gas obtained by vaporizing LNG
  • LNG vaporized gas usually contains an incombustible gas component, and the extent of the influence of the incombustible gas component on the calorific value. Therefore, there is no specific correlation between the calorific value (true calorific value) of the LNG vaporized gas and the value of the methane number.
  • the calorific value true calorific value
  • the value of the basic calorific value of natural gas used as the fuel gas there is a specific correlation between the value of the basic calorific value of natural gas used as the fuel gas and the value of the methane number calculated by each of the above criteria.
  • the “basic heat amount” refers to the amount of combustion heat of the combustible gas component when the non-combustible gas component is removed from the natural gas.
  • the basic heat amount of the LNG vaporized gas refers to the amount of combustion heat when N 2 is removed from the LNG vaporized gas.
  • the present invention has been made based on the circumstances as described above, and for a natural gas that is a measurement object gas, a methane number that can be easily obtained regardless of the gas composition.
  • An object is to provide a calculation method.
  • the present invention can easily obtain a methane number having a certain degree of reliability for natural gas, which is a measurement target gas, regardless of the gas composition, and can monitor the fuel properties of natural gas used as fuel gas. It aims at providing the methane number measuring apparatus which can be performed.
  • a specific relational expression between the methane number and the basic calorific value is obtained in advance for a plurality of kinds of reference gases each having a different methane number value each made of natural gas, Measure the basic calorific value of natural gas, the measurement target gas, The methane number of the measurement target gas is calculated from the measured basic calorific value of the measurement target gas and the specific relational expression.
  • MN is the methane number
  • f (Q ′ ) is selected according to the following formula (a) to the following formula selected according to the value of the basic calorie Q ′ [MJ / m 3 ] of the measurement target gas.
  • Any function represented by (d), and A is a value selected from the range of -2.0 to 2.0.
  • the methane number calculation method of the present invention when obtaining an approximate value of the methane number calculated by a specific arithmetic expression stipulated by the California Air Resources Council, the following relation ( Those represented by 2) are used. Moreover, when acquiring the approximate value of the methane number calculated by the method based on ISO / TR 22302 3.1.1, what is represented by following formula (3) is used as said specific relational expression. Furthermore, when obtaining an approximate value of the methane number calculated by a method based on ISO / TR 22302 3.1.2, the specific relational expression represented by the following expression (4) is used. .
  • MN is the methane number
  • f ′ (Q ′ ) is selected according to the following formula (e) and the following formula selected according to the value of the basic calorie Q ′ [MJ / m 3 ] of the measurement target gas.
  • Any function represented by the formula (f), and B is a value selected from the range of ⁇ 2.0 to 2.0.
  • Equation (3) MN is the methane number
  • Q ′ is the basic heat quantity [MJ / m 3 ] of the gas to be measured
  • C is a value selected from the range of ⁇ 2.0 to 2.0.
  • Equation (4) MN is the methane number, Q ′ is the basic heat quantity [MJ / m 3 ] of the gas to be measured, and D is a value selected from the range of ⁇ 2.0 to 2.0.
  • a specific relational expression between the methane number and the basic calorific value is obtained in advance for a plurality of kinds of reference gases made of natural gas each containing nitrogen gas and having different methane number values. , Measure the basic calorific value of the natural gas containing nitrogen gas that is the measurement target gas and the concentration of nitrogen gas contained in the measurement target gas, The methane number of the measurement target gas is calculated from the measured basic calorific value of the measurement target gas, the nitrogen gas concentration value, and the specific relational expression.
  • MN is the methane number
  • f (Q ′ ) is selected according to the following formula (g) to the following formula selected according to the value of the basic calorie Q ′ [MJ / m 3 ] of the measurement target gas.
  • (J) is one of the functions
  • E is a value selected from the range of -2.0 to 2.0.
  • X N2 is the concentration [vol%] of the nitrogen gas contained in the measurement target gas, expressed as a volume percentage.
  • MN is the methane number
  • Q ′ is the basic calorific value [MJ / m 3 ] of the measurement target gas
  • X N2 is the concentration of the nitrogen gas contained in the measurement target gas expressed as a volume percentage [ vol%]
  • F is a value selected from the range of -2.0 to 2.0.
  • the natural gas as the measurement target gas is preferably obtained by vaporizing liquefied natural gas.
  • the basic calorific value of the measurement target gas is a refractive index conversion calorie obtained from the refractive index of the measurement target gas and a sonic conversion calorie obtained from the sound speed of the measurement target gas. It is preferable that it is obtained based on these.
  • the methane number measuring device of the present invention is a calorimetric mechanism that measures the basic calorific value of natural gas that is a measurement target gas; A specific relational expression between a methane number and a basic calorific value for a plurality of kinds of reference gases made of natural gas, each of which has a different methane value, and the measurement target gas measured by the calorimetric mechanism. And a methane number calculating mechanism for calculating the methane number of the measurement target gas from the value of the basic calorific value.
  • the methane number measuring device of the present invention is a calorimetric mechanism for measuring the basic calorific value of natural gas containing nitrogen gas as a measurement target gas, A concentration measuring mechanism for calculating the concentration of nitrogen gas contained in the measurement target gas; A specific relational expression between a methane number and a basic calorific value for a plurality of kinds of reference gases made of natural gas containing nitrogen gas, each of which has a different methane number value, obtained in advance, and measured by the calorimetric mechanism. And a methane number calculating mechanism for calculating the methane number of the measurement target gas from the basic calorific value of the measurement target gas and the concentration value of the nitrogen gas measured by the concentration measurement mechanism.
  • Relational expression, specific relational expression represented by the above expression (6) for obtaining an approximate value of methane number calculated by a method based on ISO / TR 22302 3.1.1, and ISO / TR 22302 It is preferable that a specific relational expression represented by the above formula (4) for obtaining an approximate value of the methane number calculated by a method based on 1.2 is further set.
  • the natural gas that is the measurement target gas is preferably obtained by vaporizing liquefied natural gas.
  • the calorimetric measurement mechanism includes a refractive index converted calorific value measuring means for obtaining a refractive index converted calorie from a refractive index value of the measuring target gas, and a sound velocity value of the measuring target gas.
  • the apparatus includes a sonic conversion calorie measuring unit for obtaining a sonic conversion calorie from a calorie calculating unit for calculating a basic calorie of the measurement target gas based on a refractive index conversion calorie and a sonic conversion calorie.
  • the methane number calculation method of the present invention by using a specific relational expression between the basic heat quantity and the methane number acquired in advance, it is only necessary to measure the value of the basic heat quantity of the measurement target gas. Can be obtained.
  • the specific relational expression is a quantitative clarification of the correlation between the basic calorific value and the methane number, based on experiments, for multiple types of reference gas consisting of natural gas with different methane number values.
  • the obtained methane number has a certain reliability. Further, the correction based on the concentration of nitrogen gas contained in the gas to be measured makes the methane number obtained more reliable.
  • the basic calorific value of the measurement target gas is continuously measured by the calorimetric measurement mechanism, so that the measurement target gas in accordance with the actual situation is measured. Since the methane number can be obtained continuously, the actual fuel properties of natural gas as fuel gas can be monitored. Therefore, when a change in gas composition occurs, a change in methane number accompanying a change in gas composition can be detected quickly.
  • natural gas specifically, LNG vaporized gas
  • LNG vaporized gas may be a gas to be measured, and may contain an incombustible gas component such as nitrogen gas.
  • in the purification process of LNG vaporized gas It includes those from which heavy hydrocarbon components have been removed or whose contents have been adjusted.
  • FIG. 1 is a block diagram showing an outline of a configuration in an example of a methane number measuring apparatus of the present invention.
  • the methane number measuring device includes a calorific value measuring mechanism 20 that measures the calorific value of the measurement target gas, a methane number calculation mechanism 40 that calculates the methane number of the measurement target gas, and information such as the calorific value and methane number of the measurement target gas.
  • a display mechanism 45 for displaying is arranged in the explosion-proof container 10, for example.
  • the calorific value measuring mechanism 20 includes, for example, a sonic converted calorific value measuring mechanism 25 for obtaining a sonic converted calorific value Qs obtained from a sonic value of the measurement target gas, and a refractive index converted calorific value obtained from the refractive index value of the measurement target gas.
  • Refractive index conversion calorimeter 21 for obtaining Qn nitrogen concentration measuring mechanism 30 for measuring nitrogen gas concentration X N2 [vol%] contained in the measurement target gas, value of calorie Qns of the measurement target gas, and
  • a calorific value calculation mechanism 35 for calculating the value of the basic calorific value Q ′.
  • the sonic-converted calorie measuring mechanism 25 is a sonic-velocity measuring unit 26 that measures the propagation speed of sound waves in the measurement-target gas (the sonic velocity of the measurement-target gas), and the sonic-converted calorific value based on the value of the sonic velocity measured by the sonic velocity measuring unit 26.
  • Sonic-heat quantity conversion processing means 27 having a function of obtaining the value of Qs is provided.
  • the sonic-calorie conversion processing means 27 graphs, for example, a specific gas consisting only of a combustible gas component (paraffinic hydrocarbon gas) that does not contain an incombustible gas component (N 2 ) in the LNG vaporized gas that is the measurement target gas.
  • the refractive index converted calorific value measuring mechanism 21 has a refractive index measuring unit 22 that measures the refractive index of the gas to be measured, and a function that calculates the refractive index converted calorie Qn based on the value of the refractive index measured by the refractive index measuring unit 22. And a refractive index-heat quantity conversion processing means 23.
  • the refractive index-heat quantity conversion processing means 23 graphs, for example, a specific gas composed only of a combustible gas component (paraffinic hydrocarbon gas) that does not contain an incombustible gas component (N 2 ) in the LNG vaporized gas that is the measurement target gas.
  • the refractive index value obtained for the measurement target gas is the refractive index of the specific gas
  • the calorific value Qn in terms of refractive index is calculated.
  • the nitrogen concentration measuring mechanism 30 is based on the following formula based on the value of the sonic converted calorific value Qs obtained by the sonic converted calorific value measuring mechanism 25 and the value of the refractive index converted calorific value Qn obtained by the refractive index converted calorific value measuring mechanism 21.
  • the nitrogen gas contained in the measurement target gas under the condition of using a value selected as the correction factor ⁇ in the range of 1.1 to 4.2, preferably in the range of 2.40 to 2.60.
  • the concentration of is calculated.
  • X N2 in the formula (7) is a nitrogen gas concentration [vol%] expressed as a volume percentage.
  • K N2 is an error coefficient and represents the magnitude of the influence of the error exerted by N 2 as a miscellaneous gas component.
  • the unit of the value of the sonic converted heat quantity Qs and the refractive index converted heat quantity Qn used in the calculation is [MJ / m 3 ].
  • the calorific value calculating mechanism 35 is based on the value of the sonic converted calorific value Qs obtained by the sonic converted calorific value measuring mechanism 25 and the refractive index converted calorific value Qn obtained by the refractive index converted calorific value measuring mechanism 21 based on the following formula ( According to 8), the value of the calorific value Qns of the measurement target gas is set under the condition that the correction factor ⁇ is a value selected within the range of 1.1 to 4.2, preferably 2.40 to 2.60 calculate. Based on the value of the heat quantity Qns thus obtained and the value of the nitrogen gas concentration X N2 obtained by the nitrogen concentration measuring mechanism 30, the value of the basic heat quantity Q ′ [MJ / M 3 ] is calculated.
  • the methane number calculating mechanism 40 calculates an approximate solution of the methane number value obtained by the method based on the criterion selected from the above four criteria (a) to (d) for the LNG vaporized gas as the measurement target gas. calculate.
  • an approximate solution of a methane number value (hereinafter also referred to as “AVL value”) obtained by a method based on the AVL standard is taken as an example. Will be described in detail.
  • the methane number calculating mechanism 40 includes a plurality of kinds of standards composed of natural gas having different values of the methane number, which have been acquired in advance, and the basic calorific value Q ′ of the measurement target gas measured by the calorific value measuring mechanism 20.
  • the methane number of the measurement target gas is calculated from a specific relational expression between the value of the methane number (AVL value) obtained by a method based on the AVL standard and the value of the basic heat quantity Q ′.
  • the specific relational expression is the value of the basic calorie Q ′ and the AVL for each of the plurality of types of reference gas.
  • An actual measurement value indicating a relationship with the value can be acquired, and the obtained actual measurement value can be acquired, for example, by approximating the curve with a polynomial.
  • the specific relational expression related to the AVL standard is represented by the above expression (1).
  • MN is the methane number, specifically, an approximate solution of the AVL value
  • f (Q ′ ) is selected according to the value of the basic heat quantity Q ′ of the measurement target gas.
  • a in the above formula (1) is a value selected from the range of -2.0 to 2.0.
  • the value of A is within the above numerical range, the error rate with respect to the AVL value of the calculated approximate solution is within 5.0% as shown in the results of the experimental example described later, and high reliability is obtained.
  • the methane number is measured for a reference gas having a known composition, and the difference from the theoretical value (AVL value) is set as “A” (offset) Adjustment).
  • each of the curve portions represented by the above formulas (a) to (d) is continuous without causing an inflection point.
  • the reference methane number calculation curve is set in consideration of, for example, the gas composition of LNG vaporized gas that may actually exist.
  • reference numeral 11 in FIG. 1 denotes a measurement target gas introduction unit for supplying a measurement target gas to each of the sound velocity measurement unit 26 and the refractive index measurement unit 22, and 12 is necessary in the refractive index measurement unit 22 in terms of detection principle.
  • Reference gas introduction unit 13 for introducing the reference gas to be used, 13 is a gas discharge unit.
  • the dashed-two dotted line in FIG. 1 shows gas piping.
  • the methane number measuring device is connected to a gas pipeline through an appropriate gas sampling device, for example, and the LNG vaporized gas flowing through the gas pipeline is used as a measurement target gas from the measurement target gas introduction unit 11 to measure the sonic conversion calorific value.
  • the sound velocity measuring means 26 of the mechanism 25 and the refractive index measuring means 22 of the refractive index converted calorific value measuring mechanism 21 are sequentially supplied.
  • a reference gas such as air is supplied from the reference gas introducing unit 12 to the refractive index measuring means 22 of the refractive index converted calorific value measuring mechanism 21.
  • the sound velocity converted heat quantity measurement mechanism 25 calculates the sound velocity converted heat quantity Qs
  • the refractive index converted heat quantity measurement mechanism 21 calculates the refractive index converted heat quantity Qn. Then, based on the value of the sound velocity converted heat quantity Qs and the value of the refractive index converted heat quantity Qn, the value selected within the specific range as the correction factor ⁇ by the above formula (7) and the above formula (8) is used. Thus, the nitrogen gas concentration X N2 [vol%] and the heat quantity Qns are calculated. Based on the value of the heat quantity Qns thus obtained and the value of the nitrogen gas concentration X N2 [vol%], the basic heat quantity Q ′ of the measurement target gas is calculated by the above equation (9).
  • the methane number as an approximate solution of the AVL value is calculated.
  • the value of the methane number and the amount of heat Qns of the measurement target gas obtained as described above are displayed on the display mechanism 45. Note that the measurement target gas and the reference gas are discharged to the outside of the apparatus through the gas discharge unit 13.
  • the above methane number calculation method it is only necessary to measure the basic heat quantity Q ′ of the measurement target gas by using a specific relational expression between the basic heat quantity Q ′ and the methane number acquired in advance.
  • the methane number of the measurement target gas can be obtained.
  • the specific relational expression is quantified by supporting the correlation between the basic calorific value and the AVL value by experiment for multiple types of reference gas consisting of natural gas with different methane values (AVL values) based on the AVL standard. Therefore, the obtained methane number has a certain reliability.
  • the basic calorific value Q ′ of the measurement target gas is continuously measured by the calorie measuring mechanism 20, thereby obtaining an actual situation. Since the methane number as an approximate solution of the AVL value of the measurement target gas can be continuously obtained, the actual fuel property of the natural gas as the fuel gas can be monitored. Therefore, when a change in gas composition occurs, a change in methane number accompanying a change in gas composition can be detected quickly.
  • the calorific value measuring mechanism 20 and the methane number calculating mechanism 40 are arranged in the explosion-proof container 10, so that the construction and operation of the measuring system becomes simple.
  • the measurement does not take a considerable amount of time, and since there is no time lag between the calculation process of the basic heat quantity Q ′ and the calculation process of the methane number, the methane number can be measured in real time. it can.
  • the calorie measuring mechanism 20 is configured to calculate the calorific value of the gas to be measured based on the two calorific values calorie converted calorific value Qs and refractive index converted calorific value Qn. Since the difference from the true value of the calorific value Q of the measurement target gas is small regardless of the gas composition of the target gas, the reliability of the calculated methane number value is further increased.
  • the reference methane number calculation curve is such that each of the curve parts represented by the above formula (e) and the above formula (f) is continuous without causing an inflection point. It is set in consideration of the gas composition of the gas.
  • the value of B in the above equation (2) can be set by the same method as the method of setting the value of A in the above equation (1), for example.
  • the practical allowable range in which the methane number calculation curve itself serving as a reference is corrected in accordance with the actual fuel properties of the LNG vaporized gas is shown. If the value of C is within the above numerical range, the error rate of the calculated methane number (approximate solution) with respect to the methane number based on the GRI (Lc) is 5.0 as shown in the result of an experimental example described later. %, And high reliability is obtained.
  • FIG. 4 An example of the methane number calculation curve according to the GRI (Lc) standard is shown in FIG.
  • the value of C in the above equation (3) can be set, for example, by the same method as the method for setting the value of A in the above equation (1).
  • the practical allowable range in which the methane number calculation curve itself serving as a reference is corrected in accordance with the actual fuel properties of the LNG vaporized gas is shown. If the value of D is within the above numerical range, the error rate of the calculated methane number (approximate solution) with respect to the methane number based on the GRI (H / C) is 5 as shown in the result of an experimental example described later. Within 0.0%, high reliability is obtained.
  • FIG. 5 An example of a methane number calculation curve according to the GRI (H / C) standard is shown in FIG.
  • the value of D in the above equation (4) can be set, for example, by the same method as the method of setting the value of A in the above equation (1).
  • the display mechanism 45 is calculated from each of the plurality of specific relational expressions and the basic calorific value measured by the calorimeter measuring mechanism 20 for the same measurement target gas. Even if it has a function to display a plurality of methane values according to each standard at the same time, or a function to display the methane value according to the selected standard so as to be switchable with another, it may be either . With such a configuration, it is possible to obtain a methane number according to a required standard, so that high convenience can be obtained.
  • the methane number calculation mechanism 40 determines the basic calorie Q ′ of the measurement target gas measured by the calorific measurement mechanism 20.
  • nitrogen gas concentration X N2 [vol%] obtained by the value and nitrogen measurement calculation mechanism 35
  • the value of methane number (AVL value) obtained by the method based on the AVL standard
  • the value of basic heat quantity Q ′ From the relational expression, the function of calculating the methane number of the measurement target gas is assumed.
  • the specific relational expression relating to the AVL standard for the LNG vaporized gas containing nitrogen gas is preferably represented by the above formula (5).
  • This specific relational expression is obtained by the same method as the specific relational expression expressed by the expression (1) related to the AVL standard.
  • MN is the methane number, specifically, an approximate solution of the AVL value
  • f (Q ′ ) is selected according to the value of the basic heat quantity Q ′ of the measurement target gas.
  • E is a value selected from the range of -2.0 to 2.0.
  • the term of 0.320 ⁇ N2 in the above formulas (g) to (j) represents the methane number correction amount based on the nitrogen gas concentration.
  • the correction amount of the methane number is a coordinate system in which the horizontal axis represents the concentration (vol%) of the nitrogen gas contained in the measurement target gas, and the vertical axis represents the methane number.
  • the horizontal axis represents the concentration (vol%) of the nitrogen gas contained in the measurement target gas
  • the vertical axis represents the methane number.
  • the value of E in the above equation (5) can be set by the same method as the method of setting the value of A in the above equation (1), for example.
  • the methane number of the measurement target gas can be obtained with higher reliability. Therefore, according to the methane number measuring apparatus having the above configuration in which such a methane number calculation method is executed, the methane number as an approximate solution of the AVL value of the measurement target gas in accordance with the actual situation can be obtained with higher reliability. Since continuous acquisition is possible, the actual fuel properties of natural gas as fuel gas can be monitored more reliably.
  • the specific relational expression based on the (c) GRI (Lc) standard for, for example, the LNG vaporized gas containing nitrogen gas is represented by the above formula (6).
  • the practical allowable range in which the methane number calculation curve itself serving as a reference is corrected in accordance with the actual fuel properties of the LNG vaporized gas is shown.
  • the value of F is within the above numerical range, the error rate of the calculated methane number (approximate solution) with respect to the methane number based on the GRI (Lc) is 5.0 as shown in the result of the experimental example described later. %, And high reliability is obtained.
  • the value of F in the above equation (6) can be set, for example, by the same method as the method of setting the value of A in the above equation (1).
  • the calorific measurement mechanism is not limited to the one having the above-described configuration, and an apparatus having a configuration for obtaining a calorific value based on a thermal conductivity converted calorific value and a refractive index converted calorific value. May be used. Further, one of the physical property values having a specific correspondence with the amount of heat, for example, one selected from refractive index, thermal conductivity, and sound velocity is measured, and the amount of heat is obtained based on the measured value. May be.
  • the value of the methane number calculated based on the basic calorific value when the methane number calculated based on the gas composition is regarded as a true value by a method based on the GRI (Lc) standard
  • the error rate [%] with respect to the true value of the (heat value converted value) was calculated.
  • the maximum value of the error rate for the true value of the methane number value (heat value conversion value) calculated when the value of C in the above formula (3) is set within the range of -2.0 to 2.0 is shown in the table below. 4 shows.
  • the error rate [%] with respect to the true value of the value (heat value converted value) was calculated.
  • the following table shows the maximum error rate with respect to the true value of the methane number value (heat value conversion value) calculated when the value of D in the above formula (4) is set within the range of -2.0 to 2.0. As shown in FIG.
  • the value of the methane number calculated based on the basic calorific value when the methane number calculated based on the gas composition is regarded as a true value by a method based on the GRI (Lc) standard
  • the error rate [%] with respect to the true value of the (heat value converted value) was calculated.
  • the following table shows the maximum error rate with respect to the true value of the methane number value (heat value conversion value) calculated when the F value in the above formula (6) is set within the range of -2.0 to 2.0. 9 shows.
  • the methane number calculated based on the basic calorific value when the methane number calculated based on the gas composition is assumed to be a true value by a method based on the GRI (H / C) standard.
  • the error rate [%] with respect to the true value of the value (heat value converted value) was calculated.
  • the following table shows the maximum error rate with respect to the true value of the methane number value (heat value conversion value) calculated when the value of D in the above formula (4) is set within the range of -2.0 to 2.0. 10 shows.
  • the composition of the sample gas can be determined regardless of the AVL standard, CARB standard, GRI (Lc) standard, or GRI (H / C) standard. Nevertheless, it was confirmed that the methane number (approximate solution) having a value within a certain error range can be calculated with respect to the methane number according to these standards. Here, if the error rate is within 5.0%, it can be said that the error has a practically no problem.
  • the present invention can detect in real time a change in fuel properties such as a change in methane number and a change in calorific value due to a change in the gas composition of natural gas as a fuel gas, combustion control of an LNG fuel engine can be performed. In doing so, it is expected to be extremely useful.

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  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

La présente invention a pour but de fournir : un procédé de calcul de l'indice de méthane avec lequel un indice de méthane probablement fiable d'un gaz naturel à examiner peut être facilement obtenu, indépendamment de la composition du gaz; un dispositif de détermination d'indice de méthane avec lequel il est possible de surveiller les propriétés de combustible d'un gaz naturel étant utilisé en tant que gaz combustible. Dans la présente invention, une relation de spécificité entre l'indice de méthane et la valeur calorifique de base est acquise à l'avance par rapport à de multiples gaz de référence qui sont chacun constitués de gaz naturel et qui diffèrent en indice de méthane, et la valeur calorifique de base d'un gaz naturel à examiner est déterminée. L'indice de méthane du gaz à examiner est calculé à partir de la valeur mesurée de la valeur calorifique de base du gaz qui est examiné et à partir de la relation de spécificité.
PCT/JP2015/085177 2014-12-26 2015-12-16 Procédé de calcul d'indice de méthane et dispositif de détermination d'indice de méthane WO2016104270A1 (fr)

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KR20190094417A (ko) * 2016-12-15 2019-08-13 엔지 액화 천연 가스의 액상에서 메탄가 mn을 실시간으로 계산하기 위한 방법
EP3645831A4 (fr) * 2017-06-26 2021-06-16 Mustang Sampling, LLC Systèmes et procédés de génération d'indice de méthane
WO2019005356A1 (fr) 2017-06-26 2019-01-03 Mustang Sampling, Llc Systèmes et procédés de génération d'indice de méthane
JP2019045434A (ja) * 2017-09-07 2019-03-22 理研計器株式会社 ガス分析方法およびガス分析装置
EP3454059A1 (fr) * 2017-09-07 2019-03-13 Riken Keiki Co., Ltd. Procédé d'analyse de gaz et analyseur de gaz
WO2019186794A1 (fr) * 2018-03-28 2019-10-03 理研計器株式会社 Procédé de détection de gaz et dispositif de détection de gaz
JP2019174435A (ja) * 2018-03-28 2019-10-10 理研計器株式会社 ガス検出方法およびガス検出装置
WO2019187710A1 (fr) * 2018-03-28 2019-10-03 理研計器株式会社 Procédé et dispositif de détection de gaz
JP2021196263A (ja) * 2020-06-15 2021-12-27 理研計器株式会社 メタン価測定装置およびメタン価算出方法
JP7445531B2 (ja) 2020-06-15 2024-03-07 理研計器株式会社 メタン価測定装置およびメタン価算出方法

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