WO2004008136A1 - Determination de la nature de gaz combustibles par mesure de la conduction thermique, capacite thermique et la fraction d'oxyde de carbone - Google Patents

Determination de la nature de gaz combustibles par mesure de la conduction thermique, capacite thermique et la fraction d'oxyde de carbone Download PDF

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Publication number
WO2004008136A1
WO2004008136A1 PCT/DE2003/002283 DE0302283W WO2004008136A1 WO 2004008136 A1 WO2004008136 A1 WO 2004008136A1 DE 0302283 W DE0302283 W DE 0302283W WO 2004008136 A1 WO2004008136 A1 WO 2004008136A1
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WO
WIPO (PCT)
Prior art keywords
gas
determined
thermal conductivity
calorific value
heat capacity
Prior art date
Application number
PCT/DE2003/002283
Other languages
German (de)
English (en)
Inventor
Joachim Kastner
Original Assignee
Flowcomp Systemtechnik Gmbh
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 Flowcomp Systemtechnik Gmbh filed Critical Flowcomp Systemtechnik Gmbh
Priority to DE10393422T priority Critical patent/DE10393422D2/de
Priority to AU2003250779A priority patent/AU2003250779A1/en
Publication of WO2004008136A1 publication Critical patent/WO2004008136A1/fr

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Classifications

    • 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
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/005—Investigating or analyzing materials by the use of thermal means by investigating specific heat
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity

Definitions

  • the invention relates to a method for determining the gas quality of fuel gases according to the preamble of claim 1.
  • the calorific value is usually measured with a combustion calorimeter or calculated from the gas composition, which is determined with a process gas chromatograph.
  • the volume flow is measured by means of orifice plates or turbine wheel counters - more recently with ultrasonic counters.
  • the volume flow must be converted from the operating state to the standard state, which is usually done using an equation of state (eg SGERG method) IM.
  • the calorific value, the standard density and the C0 2 content are required as input variables. If a calorimeter is used to determine the calorific value, the standard density and the CO 2 content must also be measured. If a process gas chromatograph is used, the input variables can be derived from the gas composition.
  • the gas quality measurement method presented is based on the measurement of 3 variables which correlate well with the target variables and are easy to measure.
  • the selected measurands are:
  • the gas state can also be recorded for correction:
  • the thermal conductivity ⁇ is a quantity-independent quantity
  • the measurement of the heat capacity c p relates to the quantity of substance in a certain effective measurement volume. Neglecting real gas effects and the constant molar volume, the measured heat capacity at atmospheric pressures can be used in a very good approximation as a measure of the molar heat capacity. The relationship between the measured and the molar heat capacity can then be viewed as a device constant, which is determined by calibration.
  • the relevant core target values are determined from these measured values using a calculation method:
  • volumetric calorific value (preferably as standard calorific value H or ,) H 0
  • Density (preferably as standard density p n ) p
  • a first way to determine the desired gas parameters of the fuel gas is based on a direct approach:
  • the isobaric heat capacity c p of a molecule depends on the number of degrees of freedom f, which in turn depends on the number of bonds and the molecular structure. In general, the heat capacity c p increases with the number of bonds.
  • the thermal conductivity ⁇ also depends on the number of degrees of freedom f and the molecular mass, f increases with the complexity and mass of the molecules, the thermal conductivity ⁇ decreases.
  • Heat capacity c p , thermal conductivity ⁇ and xC0 2 measurement thus provide different information about the molecular structure distribution in the gas mixture, these relationships form the basis for approaches (1), (2).
  • the gas quantities calorific value H 0 and density p (again not used as a standard calorific value H on and standard density p n ) can be represented as follows, ignoring real gas effects:
  • H C H is the volumetric calorific value of the CH component and the p- are the mass densities of the gas components.
  • the isobaric heat capacity c p of a gas is determined by the degrees of freedom of its molecules.
  • the heat capacity c p can be calculated according to a linear mixture rule from the heat capacities c p ⁇ of the mixture components / 3 /:
  • the thermal conductivity ⁇ of the gas mixture is also represented by a simple linear mixing rule with the component contributions ⁇ j. Interaction terms are neglected to a good approximation / 3 /:
  • ⁇ xCH • ⁇ CH + xN 2 • ⁇ N 2 + xC0 2 • ⁇ C0 2
  • the molar quantities Hc H .m and pcH.m can be represented with the physical reason given above by thermal conductivity ⁇ and heat capacity c p . In this specific case, only the CH gas consisting of regularly constructed alkanes should be described. In the following approach, the molar quantities HcH.m and pcH.m are shown as a function of the molar heat capacity of the hydrocarbon gas CpcH:
  • the primary target variables can finally be calculated from equations (4), (5), (11), (12) and knowledge of C PC H and xCH.
  • the calculation is based on the largest possible set of real gas analyzes, and 210 typical natural gas analyzes from German gas networks were examined. According to ISO 6976, the core target values H on , pn were calculated from the gas analyzes, and the heat capacity c p and thermal conductivity ⁇ were determined as a function of the gas composition / 3 /.
  • Successful approaches for A and B are e.g. Multivariate 3rd order polynomials that can be determined in a regression calculation.
  • the function can be represented as a simple linear relationship, so that the system of equations described above can be easily solved.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

L'invention concerne un procédé permettant de déterminer la nature de gaz combustibles, selon lequel on utilise des processus de corrélation pour déterminer des caractéristiques de gaz à partir de grandeurs mesurées par des techniques de mesure sur le gaz combustible, ces caractéristiques donnant des informations sur la nature du gaz combustible. Ces grandeurs mesurées sont la conductivité thermique ?, la capacité thermique cp et la fraction d'oxyde de carbone XC02 du gaz combustible concerné. Sur la base de ces grandeurs mesurées, on calcule les caractéristiques de gaz en tenant compte de grandeurs de matière connues de gaz combustibles typiques comme, par exemple, le pouvoir calorique, la densité, l'indice de Wobbe, l'indice de méthane etc.
PCT/DE2003/002283 2002-07-10 2003-07-08 Determination de la nature de gaz combustibles par mesure de la conduction thermique, capacite thermique et la fraction d'oxyde de carbone WO2004008136A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE10393422T DE10393422D2 (de) 2002-07-10 2003-07-08 Bestimmung der Gasbeschaffenheit von Brenngasen durch Messung von Wärmeleitfähigkeit, Wärmekapazität und Kohlendioxidanteil
AU2003250779A AU2003250779A1 (en) 2002-07-10 2003-07-08 Determining the constitution of combustible gases by measuring the thermal conductivity, thermal capacity and carbon dioxide content

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002131269 DE10231269B4 (de) 2002-07-10 2002-07-10 Bestimmung der Gasbeschaffenheit von Brenngasen durch Messung von Wärmeleitfähigkeit, Wärmekapazität und Kohlendioxidanteil
DE10231269.9 2002-07-10

Publications (1)

Publication Number Publication Date
WO2004008136A1 true WO2004008136A1 (fr) 2004-01-22

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PCT/DE2003/002283 WO2004008136A1 (fr) 2002-07-10 2003-07-08 Determination de la nature de gaz combustibles par mesure de la conduction thermique, capacite thermique et la fraction d'oxyde de carbone

Country Status (3)

Country Link
AU (1) AU2003250779A1 (fr)
DE (2) DE10231269B4 (fr)
WO (1) WO2004008136A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2015056A1 (fr) 2007-07-07 2009-01-14 Mems Ag Procédé et capteur destinés à la détermination d'une taille pertinente pour la combustion d'un mélange de gaz
DE102008038278B3 (de) * 2008-08-18 2009-10-22 Elster Gmbh Verfahren zur Bestimmung der Gasqualität von Synthesegas
EP2571086A3 (fr) * 2011-09-14 2013-04-10 Azbil Corporation Système de génération de puissance électrique et système de mesure de gaz
WO2016056902A1 (fr) * 2014-10-07 2016-04-14 Berkin B.V. Procédé et système destinés à déterminer les fractions d'un flux gazeux en continu
EP3021117A1 (fr) * 2014-11-14 2016-05-18 Mems Ag Procede et dispositif de mesure destines a la determination de tailles specifiques pour la qualite du gaz
CN107209164A (zh) * 2015-07-22 2017-09-26 理研计器株式会社 甲烷值计算方法及甲烷值测定装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2719830T3 (es) * 2015-12-19 2019-07-16 Mems Ag Procedimiento y dispositivo de medición para la determinación de propiedades del gas por medio de correlación

Citations (5)

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Publication number Priority date Publication date Assignee Title
JPH0643125A (ja) * 1992-01-10 1994-02-18 Tokyo Gas Co Ltd 都市ガスの燃焼速度測定装置
US5311447A (en) * 1991-10-23 1994-05-10 Ulrich Bonne On-line combustionless measurement of gaseous fuels fed to gas consumption devices
EP0715169A1 (fr) * 1994-12-02 1996-06-05 British Gas plc Mesure d'une caractéristique d'un gaz
US6047589A (en) * 1996-04-22 2000-04-11 Bg Plc Apparatus for measuring a gas value
US20020040590A1 (en) * 2000-09-29 2002-04-11 Ruhrgas Ag Method and device for determining the gas properties of a combustible gas

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5311447A (en) * 1991-10-23 1994-05-10 Ulrich Bonne On-line combustionless measurement of gaseous fuels fed to gas consumption devices
JPH0643125A (ja) * 1992-01-10 1994-02-18 Tokyo Gas Co Ltd 都市ガスの燃焼速度測定装置
EP0715169A1 (fr) * 1994-12-02 1996-06-05 British Gas plc Mesure d'une caractéristique d'un gaz
US6047589A (en) * 1996-04-22 2000-04-11 Bg Plc Apparatus for measuring a gas value
US20020040590A1 (en) * 2000-09-29 2002-04-11 Ruhrgas Ag Method and device for determining the gas properties of a combustible gas

Non-Patent Citations (3)

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Title
DATABASE WPI Section Ch Week 199412, Derwent World Patents Index; Class J04, AN 1994-095062 *
JAESCHKE M ET AL: "Thermodynamic research improves energy measurement in natural gas", FOURTEENTH SYMPOSIUM ON THERMOPHYSICAL PROPERTIES, BOULDER, CO, USA, 25-30 JUNE 2000, vol. 23, no. 4, International Journal of Thermophysics, July 2002, Kluwer Academic/Plenum Publishers, USA, pages 1013 - 1031, XP008017844, ISSN: 0195-928X *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 267 (P - 1741) 20 May 1994 (1994-05-20) *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2015056A1 (fr) 2007-07-07 2009-01-14 Mems Ag Procédé et capteur destinés à la détermination d'une taille pertinente pour la combustion d'un mélange de gaz
DE102008038278B3 (de) * 2008-08-18 2009-10-22 Elster Gmbh Verfahren zur Bestimmung der Gasqualität von Synthesegas
EP2571086A3 (fr) * 2011-09-14 2013-04-10 Azbil Corporation Système de génération de puissance électrique et système de mesure de gaz
NL2013587B1 (nl) * 2014-10-07 2016-10-03 Berkin Bv Werkwijze voor het bepalen van de fracties van een stromend gasvormig medium, alsmede systeem daarvoor.
WO2016056902A1 (fr) * 2014-10-07 2016-04-14 Berkin B.V. Procédé et système destinés à déterminer les fractions d'un flux gazeux en continu
CN107209163A (zh) * 2014-10-07 2017-09-26 伯金有限公司 用于确定流动气体介质的分数的方法和系统
EP3021117A1 (fr) * 2014-11-14 2016-05-18 Mems Ag Procede et dispositif de mesure destines a la determination de tailles specifiques pour la qualite du gaz
CN105606786A (zh) * 2014-11-14 2016-05-25 Mems股份公司 用于确定燃气品质的特定量值的方法和测量装置
US10101186B2 (en) 2014-11-14 2018-10-16 Mems Ag Method and measuring apparatus for determining specific quantities for gas quality
RU2690099C2 (ru) * 2014-11-14 2019-05-30 Мемс Аг Способ и измерительное устройство для определения удельных параметров для свойства газа
CN105606786B (zh) * 2014-11-14 2019-12-24 Mems股份公司 用于确定燃气品质的特定量值的方法和测量装置
CN107209164A (zh) * 2015-07-22 2017-09-26 理研计器株式会社 甲烷值计算方法及甲烷值测定装置
CN107209164B (zh) * 2015-07-22 2020-12-08 理研计器株式会社 甲烷值计算方法及甲烷值测定装置

Also Published As

Publication number Publication date
AU2003250779A1 (en) 2004-02-02
DE10231269A1 (de) 2004-01-22
DE10393422D2 (de) 2005-06-09
DE10231269B4 (de) 2013-11-07

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