| OCR Text |
Show microscopy. The coal mineral matter was dominated by small inclusions of clays, calcite and pyrite. Most of the mineral particles in the coal had diameters less than 10 microns. When the coal was combusted, the resulting ash particles were also very fine with about 55 % less than 11 microns on a weight basis. Additionally, there was a lot of interaction between the clays and the calcite and pyrite creating low melting point materials. The alumino-silicates with high concentrations of Fe and Ca could present problems, however, their small particle size indicates that they would tend to follow the gas streamlines. The testing at Salem Harbor occurred on two consecutive weeks. For the baseline coal, the tests were conducted on November 8 and 9; for the Pocahontas coal, the tests were conducted on November 15 and 16. The furnace observations were made under full load with all four rows of burners operating. 130'~· B Secondary Superheate, Inlet Heade, Secondary Superht,. Outlet Header Reheater Outlet Header Reheater Inlet Heade, Elev.142 Primary Superhtr. Outlet Elev. 12O Elev. 51 f--- 28'~---+--26'-9· ----+-,.'~ ~ New Eng.net Po.., eomp.ny . Salem H8rt»or StMIon Salem, Mluechueetta UNIT NO. 3 BOILER B-6794 Figure 2. Salem Harbor #3 with OTM and Sootblower Locations Table 2. Test Coal Properties Baseline Pocahontas % Moisture 6.7 8.0 % Ash 9.4 5.5 % VM 20.3 18 .7 CV (Btu/lb) 13 , 190 14 100 Grindability 90 to 100 90 to 100 %S 1.45 0.94 Ash fusion (OF, reducing) 2,700+ 2,300 6 |
