The objectives of this research program were two-fold: to experimentally determine the comparative in situ SO/sub 2/, NO/sub x/, and particulate-controlling capacity of calcium-doped coal under simulated combustion turbine conditions as a function of pressure, firing temperature, raw coal organic sulfur content, molar calcium/sulfur ratio, calcium source, and calcium loading technique, and to analytically determine the technical and economic feasibility of directly firing calcium impregnated coal in a combustion turbine. The calcium-doped bituminous coals consisted of high-sulfur Illinois No. 6 that had been premixed with various limes using either a proprietary Battelle process or simple physical mixing. The calcium-impregnated coal is called Battelle Treated Coal (BTC). The simulated turbine combustion conditions consisted or super-atmospheric pressure (4 to 5 atm), ultra-high excess air (10 to 15% excess oxygen), variable firing temperature (1800 to 2100/sup 0/F), and high-carbon conversion (98 %). Battelle has operated a pulverized coal-fired facility that essentially simulates combustion turbine conditions. This simulator has proven to be of practical value in research concerned with the screening of coal fuels for advanced combustion turbines. Specifically, it has demonstrated that at low levels of calcium impregnation (Ca/S <2), increasing superatmospheric pressure (about 4 atm), high excess air conditions (15% excess O/sub 2/), short residence times (<250 milliseconds), and typical firing temperatures (2100/sup 0/F), the use of BTC does the following during turbine combustion: improves ignition and stability, shortens char burnout time, relaxes materials problems, reduces internal deposition, reduces internal erosion, reduces internal corrosion, and simultaneously controls SO/sub 2/, NO/sub x/, and RO/sub x/ emissions. 35 refs., 12 figs., 15 tabs.