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Modeling of Fossil Fuel Formation

Study the formation process of fossil fuels, focusing on coal formation from peat to anthracite through coalification stages and chemical transformations over millions of years. Learn about coal classification and composition.

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Modeling of Fossil Fuel Formation

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  1. Modeling of Fossil Fuel Formation P M V Subbarao Professor Mechanical Engineering Department Study of Natural Resources for Better Design….

  2. Brown Coal Plant Debris Peat Lignite Sub-Bituminous Diamond Anthracite Semi Anthracite Bituminous Formation of Coal

  3. Lignin Structure of Peat Structure of smallest molecule: Bio-chemical Reaction:

  4. Atmospheric CO2 Concentration at Peat Bogs

  5. First Law Analysis of Formation of Peat :SSSF Q m Peat m vegetation m CO2 Q m CH4 Species Conservation Equation: W Conservation of Mass: First Laws for furnace in SSSF Mode:

  6. Secondary Transformation : Geo-Chemical Stage • The decayed vegetation was subjected to extreme temperature and crushing pressures. • It took several hundred million years to transform the soggy Peat into the solid mineral. • 20 m of compacted vegetation was required to produce 1 m seam of coal. • This is called as coalification or coal forming. • The extent to which coalification has progressed determines the rank of coal.

  7. Secondary Transformation : Geo-Chemical Stage

  8. Chemical Structure of Coal

  9. Coal Ranking

  10. Modeling of Coalification Peat to Enriched peat: (mostly due to heating)

  11. Enriched peat to lignite: (mostly due to pressure &heating)

  12. lignite to Sub-bituminous: (mostly due to pressure &heating)

  13. Sub-bituminous to High volatile Bituminous:

  14. High Volatile Bituminous to Medium volatile Bituminous: Medium Volatile Bituminous to Low volatile Bituminous: Low Volatile Bituminous to semi Anthracite: Semi Anthracite to Anthracite:

  15. Coal Classification • There are two main ways for classifying coal - by rank and by type. • Coal Rank • Coal Types • Coal Rank : The degree of 'metamorphisrn' or coalification undergone by a coal, as it matures from peat to anthracite, has an important bearing on its physical and chemical properties, and is referred to as the 'rank' of the coal. • Low rank coals, such as lignite and sub-bituminous coals, are typically softer, friable materials with a dull, earthy appearance; they are characterised by high moisture levels and a low carbon content, and hence a low energy content. • Higher rank coals are typically harder and stronger and often have a black vitreous lustre.

  16. Composition of Coals • The natural constituents of coal can be divided into two groups: • (i) the organic fraction, which can be further subdivided into microscopically identifiable macerals; and • (ii) the inorganic fraction, which is commonly identified as ash subsequent to combustion, but which may be isolated in the form of mineral matter by low-temperature ashing (LTA). • The organic fraction can be further subdivided on the basis of its rank or maturity.

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