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    NatGas 1

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    Mierza Saputra
    This document discusses the analysis of natural gas composition and properties. It describes how natural gas is an important energy resource but its calorific value and quality can vary. An accurate, rapid analysis is needed to assess new sources and monitor production. The solution discussed is a gas chromatography system from Ellutia that can measure the concentration of components like methane, ethane, and heavier hydrocarbons, and calculate properties such as calorific value, density, and Wobbe index to standard methods. Test results show the calculated values match the manufacturer's specifications.

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    © All Rights Reserved
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    NatGas 1

    Uploaded by

    Mierza Saputra
    70 views2 pages
    This document discusses the analysis of natural gas composition and properties. It describes how natural gas is an important energy resource but its calorific value and quality can vary. An accurate, rapid analysis is needed to assess new sources and monitor production. The solution discussed is a gas chromatography system from Ellutia that can measure the concentration of components like methane, ethane, and heavier hydrocarbons, and calculate properties such as calorific value, density, and Wobbe index to standard methods. Test results show the calculated values match the manufacturer's specifications.

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    Gas

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    NatGas_1_

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    This document discusses the analysis of natural gas composition and properties. It describes how natural gas is an important energy resource but its calorific value and quality can vary. An accurate, rapid analysis is needed to assess new sources and monitor production. The solution discussed is a gas chromatography system from Ellutia that can measure the concentration of components like methane, ethane, and heavier hydrocarbons, and calculate properties such as calorific value, density, and Wobbe index to standard methods. Test results show the calculated values match the manufacturer's specifications.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    70 views2 pages

    NatGas 1

    Uploaded by

    Mierza Saputra
    This document discusses the analysis of natural gas composition and properties. It describes how natural gas is an important energy resource but its calorific value and quality can vary. An accurate, rapid analysis is needed to assess new sources and monitor production. The solution discussed is a gas chromatography system from Ellutia that can measure the concentration of components like methane, ethane, and heavier hydrocarbons, and calculate properties such as calorific value, density, and Wobbe index to standard methods. Test results show the calculated values match the manufacturer's specifications.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    Example Solutions

    Natural Gas Analysis

    The Problem
    For over 150 years, natural gas has been sold and holds a position of major significance in the world’s energy resources.
    The Calorific Value of the Natural Gas is of vital importance, as this displays the ‘heating value’ and hence the relative
    quality. The Calorific Value is used by the supplier, to produce a constant quality of gas as well as the customer, to
    ensure the gas is of the correct composition prior to use.

    The rapid and accurate analysis of the Natural Gas is therefore of critical importance; firstly at the development stage
    for assessing the quality of new finds and secondly at the production stage for QA purposes.
    The principle parameters affecting its economic value being Calorific Value, Compressibility, Specific Gravity, Density
    and Wobbe Index.

    The Solution
    Ellutia offers a range of Natural Gas Analysers. The example below is based around a specially modified 200 Series
    Gas Chromatograph.

    Valves: Three Electrically Operated Switching Valves


    Columns: Three Stainless Steel Columns and One Capillary Column
    GC: Ellutia 200 Series GC
    Detectors: Thermal Conductivity Detector (TCD)
    Flame Ionisation Detector (FID)

    This system quantifies CO2, O2, N2 and Methane on the TCD and from C2-C10 on the FID, with C6 and above being
    grouped for calculation if required.

    Clarity data station software automatically reports Component Concentration, Calorific Value, Compressibility, Specific
    Gravity, Density and Wobbe Index in compliance with:

    ISO 6976-95 Calculation of Calorific Values, Density, Relative Density and Wobbe Index from Composition.

    ASTM D3588-98 Standard Practice for Calculating Heat Value, Compressibility Factor, and Relative Density of Gaseous
    Fuels, Ideal & Real Heating Values in BTU’s

    GPA 2172-09 Calculation of Gross Heating Value, Relative Density and Compressibility Factor for Natural Gas Mixtures
    from Compositional Analysis.
    System Sample in Helium In Splitter Vent H2 in
    Carrier
    EPPC
    Split/Splitless Air in
    Control
    Injector

    1
    CV1 & 6 2 NV4
    MEA 1 He in
    5 3 Injector oven
    4 TCD reference
    FID
    Analysis A
    SL1

    Sample Out SL2


    Stripper B Detector
    1 Oven
    2
    10
    Stripper 3
    9
    Vent NV2 CV2 &
    4
    8 MEA2
    5
    7 6

    TCD
    NV1 Analysis B

    He
    Carrier in
    Bypass B

    1
    6 2
    CV3 & Column Oven
    NV3
    MEA3 5 3
    4

    Results Calibration Standard


    Component Amount Fraction / (%mol/mol)
    Comparison of the Superior Calorific Value Oxygen 0.0524 ±0.0027
    calculated on an Ellutia Natural Gas Analyser
    Nitrogen 1.519 ±0.013
    and of the manufacturers specification.
    Carbon Dioxide 0.705 ±0.006
    Methane 93.782 ±0.1
    Calculated Values Ethane 3.242 ±0.019
    Mean Molecular Weight 17.11 Propane 0.498 ±0.04
    Relative Density 0.59 Iso-Butane 0.1015 ±0.0013
    Density 0.73 kg/m 3
    n-Butane 0.1010 ±0.0013

    Superior Calorific Value 38.3 MJ/m3 CV (Superior @ 15˚C/15˚C) 38.3 ±0.04


    Inferior Calorific Value 34.53 MJ/m 3
    Calculated by ISO6976:1995(E) including amendment No.1 - May 1998.
    The expanded uncertainty is based on a standard uncertainty multiplied by a
    Wobbe Index 49.79 MJ/m3
    coverage factor K=2, providing a level of confidence of approximately 95%.

    UK Tel: 01353 669916 Fax: 01353 669917


    USA Tel: 843 559 4889 Fax: 843 559 4889
    Germany Tel: 0561 400 0430 Fax: 0561 400 0429
    Email: info@ellutia.com Website: http://www.ellutia.com

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