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Relationships Between Coal Chemistry and Decomposition Products



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Relationships Between Coal Chemistry and Decomposition Products Thomas H Fletcher Chemical Engineering Department Brigham Young University GCEP Meeting March 15 2005 Provo UT Outline What is coal Simple descriptions of coal reaction Coal chemistry Lattice models Secondary reactions Light gas Nitrogen evolution Coal Decomposition Tar Coal heat Soot Volatiles Light gas Char Primary Devolatilization Secondary Devolatilization Definition Tar Volatiles that condense at room T and P Coalification 0 1 0 0 0 8 m 0 0 2 0 0 0 0 0 a b it um lv b i t u 51 hv lv bituminous 4 1 14 0 0 4 lignite bituminous 0 0 6 1508 H C R a tio subbituminous 93 hv b b m i tu 4 14 5 su bb itu m 15 07 li g n it e anthracite 0 1 0 2 0 3 O C R a tio Graphite 0 4 0 5 Moderate Temperature Pyrolysis 0 10 bit um hv a 14 14 51 0 04 0 06 1508 lv bitu m H C Ratio 0 08 93 b hv tu bi m 4 14 5 b su u bi t m ite ign l 07 15 0 02 0 00 0 0 0 1 0 2 0 3 O C Ratio 0 4 0 5 Early Char Combustion 0 10 b it um hv a 51 14 93 b hv um b it 14 b su 5 4 u b it 14 0 04 lv b i t u m 0 06 1508 H C R a tio 0 08 15 0 ig 7l e n it CCL 0 post flame CCL 6 post flame CCL 6 post flame 0 02 0 00 0 0 m 0 1 0 2 0 3 O C Ratio O2 47 ms O2 47 ms O2 72 ms 0 4 0 5 Coal Structure Loop Structure R H Mobile Phase Group H2 C H H2 H2 H2 O Side Chain CH 3 H2 H2 H C H H C H O H H H Bridge Structures Bi aryl Bridge O OH H H2 H C H OH H2 R O H C H C O H2 OH N N H2 H2 O HO C H2 C S CH 3 H2 Pyridinic Nitrogen O OH Pyrrolic Nitrogen CH 2 R Aromatic Cluster Primary Coal Pyrolysis R Tar H2 H2 CH 3 Tar H2 O H2 H2 OH CH 3 CH 3 CH3 H2 O H H R C H O CO2 H2 O R H C H H N N H2 H2 O C S CH 3 CO2 OH CH 3 Lattice Devolatilization Models Coal molecule description 13C NMR spectroscopy Rates of bridge breaking Aromatic clusters remain intact Kinetics are coal independent Lattice statistics Amount of liberated fragments Vapor liquid equilibrium Light fragments vaporize Crosslinking Stable bridges form making char Types of Lattices A Coordination number 3 H ON E Y C O M



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