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    Analysis of Washery Rejects

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    JKK
    The document analyzes the properties of washery rejects from a coal washing process. It shows that the rejects have 9.98% moisture, 62.3% ash, 20.62% carbon, and a gross calorific value of 1700 kcal/kg. Testing of the raw coal feed and outputs from the washing process is also presented, showing the cleaned coal and rejects have average ash contents of 17.74% and 57.26% respectively. The washery rejects are estimated to have a calorific value between 1800-2000 kcal/kg and will be blended with raw coal at a 70:30 ratio for boiler design.

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    Analysis of Washery Rejects

    Uploaded by

    JKK
    93 views3 pages
    The document analyzes the properties of washery rejects from a coal washing process. It shows that the rejects have 9.98% moisture, 62.3% ash, 20.62% carbon, and a gross calorific value of 1700 kcal/kg. Testing of the raw coal feed and outputs from the washing process is also presented, showing the cleaned coal and rejects have average ash contents of 17.74% and 57.26% respectively. The washery rejects are estimated to have a calorific value between 1800-2000 kcal/kg and will be blended with raw coal at a 70:30 ratio for boiler design.

    Original Title

    WASHERY ANALYSIS

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    The document analyzes the properties of washery rejects from a coal washing process. It shows that the rejects have 9.98% moisture, 62.3% ash, 20.62% carbon, and a gross calorific value of 1700 kcal/kg. Testing of the raw coal feed and outputs from the washing process is also presented, showing the cleaned coal and rejects have average ash contents of 17.74% and 57.26% respectively. The washery rejects are estimated to have a calorific value between 1800-2000 kcal/kg and will be blended with raw coal at a 70:30 ratio for boiler design.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    93 views3 pages

    Analysis of Washery Rejects

    Uploaded by

    JKK
    The document analyzes the properties of washery rejects from a coal washing process. It shows that the rejects have 9.98% moisture, 62.3% ash, 20.62% carbon, and a gross calorific value of 1700 kcal/kg. Testing of the raw coal feed and outputs from the washing process is also presented, showing the cleaned coal and rejects have average ash contents of 17.74% and 57.26% respectively. The washery rejects are estimated to have a calorific value between 1800-2000 kcal/kg and will be blended with raw coal at a 70:30 ratio for boiler design.

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    -1-

    ANALYSIS OF WASHERY REJECTS


    % Wt
    Proximate analysis
    Total Moisture 9.98
    Ash 62.3
    Volatile Matter 13.86
    Fixed Carbon 13.86

    HHV (kcal/kg) As Received 1700

    Ultimate Analysis
    Moisture 9.98
    Ash 62.3
    Carbon 20.62
    Hydrogen 0.9
    Nitrogen 0.35
    Sulphur 0.25
    Oxygen (By Diff) 5.6
    GCV (Kcal/kg) 1700
    Others
    Fixed carbon to VM ratio 1.0
    -2-

    TYPICAL RESULTS OF COAL WASHERY


    SHOWING PROPERTIES OF WASHED COAL AND REJECTS

    Raw Coal feed to washery


    Tonnes Ash, % S.D Screen Analysis
    Size fraction Wt % Ash, %
    Chance Cone 39294.43 27.32 1.74 - 75 +10 mm 70.14 29.04
    circuit -10 +0.5 mm 24.19 23.93
    - 0.5 mm 5.67 20.49
    Fine coal section 12421.00 27.69 1.63 + 20 mm* 3.01 32.91
    - 20 + 0.5 mm 81.28 28.64
    - 0.5 mm 5.67 21.79
    * + 20mm fraction is screened out and mixed with chance cone feed
    Overall Production
    Clean coals Middlings Rejects
    Standard (ash %) 17.5 33.5 51.00
    Average (ash %) 17.74 39.06 57.26
    Standard deviation 0.21 2.98
    Moisture 6.67 8.49
    Tonnes 28,520.83 18204.10 4990.50
    Yield % 55.15 35.20 9.65

    Note 1: For the purpose of design, Calorific Value of Coal Washery rejects is
    Considered as 1800 to 2000 K Cal/kg
    2: The blending of Indian coal and Washery rejects will be 70: 30 this
    Proportion shall be considered for designing the boiler.
    -3-

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