Modeling of Fossil Fuel Formation

1. Modeling of Fossil Fuel Formation P M V Subbarao Professor Mechanical Engineering Department

2. Formation of Coal

4. Lignin Structure of Peat

5. Atmospheric CO2 Concentration at Peat Bogs

7. 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.

9. Chemical Structure of Coal

12. Coal Ranking

13. Modeling of Coalification

18. 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.

19. 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.