Clean Coal Technologies Initiative Hearing Before the Subcommittee On Energy D
Clean Coal Technologies Initiative Hearing Before the Subcommittee On Energy D
United States Congress House Committee On Scien
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23 102 FIGURE 3 PLUGGED TUBE BANK DURING PULVERIZED COAL PARAMETRIC TESTING (WITHOUT SOOTBLOWING) 103 FIGURE 4 Air-cooled tubes prior to soot blowing. FIGURE 5 Air-cooled tubes immediately after soot blowing. 25 104 A step in this direction was taken when MP&L performed a unique test in which micronized coal was fired in four of the twelve burners of a 100-MW unit at their Delta station. Approximately 10, 000 tons of coal ground to about 98% less than 44 microns in a 20 ton/hr capacity fluid en...ergy mill were burned. The coal contained about 11. 5% ash and accounted for one-third of the heat input to the boiler co-fired with natural gas, which would be roughly equivalent to the use of 4% ash coal (as was used in the GSU-sponsored BCTU tests) in a boiler designed for oil or gas and with future coal capability. Relatively minor accumulation of ash was found on the flat bottom furnace floor and convection section surfaces. Economic ^nd engineering evaluations have been performed to establish the merits of dry micronized coal conversion for units in the 100 to 150-MW size range and, depending on specific requirements at potential conversion sites, conditions may be obtained which would justify conversion of existing oil/gas fired units to dry micronized coal.
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