Extensive thermodynamic and preliminary experimental studies have identified the potential use of aluminosilicate materials to simultaneously remove volatile alkali and particulate released during pressurized gasification of coal. The gettering capacity of three selected materials have been evaluated in a bench-scale reactor operating at 1114 kPa total pressure and 1123–1173K in alkali-laden inert, and simulated fuel gas environments. At 1123 K, alkali gettering has been established to result through reaction within the amorphous acid-insoluble alumino-silicate fraction of these materials, while at 1173 K saturation of the insoluble matrix is achieved, with gettering occurring mainly through acid-soluble complexes. The gettering mechanism as either a chemical reaction or a physical adsorption phenomenon and reaction kinetics will be delineated through future thermogravimetric (TG) analyses.

Burning residual oil in utility combustion turbines and the consequent deposition on blades and vanes may adversely affect reliability and operation. Corrosion and deposition data for combustion turbine materials have been obtained through dynamic testing in pressurized passages. The deposition produced by the 1900°F (1038°C) combustion gases from a simulated and a real residual oil on cooled Udimet 500 surfaces is described. Higher deposition rates for the doped fuel than for the real residual oil raised questions of whether true simulation with this approach can be achieved. Particles 4–8 μm in diameter predominated in the gas stream, with some fraction in the 0.1–12 μm range. Deposition rates seemed to be influenced by thermophoretic delivery of small molten particles, tentatively identified as magnesium pyro and metavanadates and free vanadium pentoxide, which may act to bond the larger solid particles arriving by inertial impaction to turbine surfaces. Estimated maintenance intervals for current utility turbines operating with washed and treated residual oil agreed well with field experience.

Burning residual oil in utility combustion turbines and the consequent deposition on blades and vanes may adversely affect reliability and operation. Corrosion and deposition data for combustion turbine materials have been obtained through dynamic testing in pressurized passages. The deposition produced by the 1900°F (1038°C) combustion gases from a simulated and a real residual oil on cooled Udimet 500 surfaces is described. Higher deposition rates for the doped fuel than for the real residual oil raised questions of whether true simulation with this approach can be achieved. Particles 4–8 μ m in dia predominated in the gas stream, with some fraction in the 0.1–12 μ m range. Deposition rates seemed to be influenced by thermophoretic delivery of small molten particles, tentatively identified as magnesium pyro and metavanadates and free vanadium pentoxide, which may act to bond the larger, solid particles arriving by inertial impaction to turbine surfaces. Estimated maintenance intervals for current utility turbines operating with washed and treated residual oil agreed well with field experience.

Tests have been made in a combustion turbine burner using six petroleum-derived surrogate (PDS) fuels simulating six coal-derived liquid (DCL) fuels tested earlier. The purpose being to examine their suitability for use in place of scarce CDL fuels for combustor development. The PDS and DCL fuels were matched in terms of aromaticity and fuel bound nitrogen although differences in viscosity, distillation range and constituent species existed. In three cases, the low fuel bound nitrogen present in the PDS fuels was made equal to their coal liquid counterparts via the addition of quinoline. All six PDS fuels were evaluated on a 0. 14-m-dia combustor while one of the surrogate fuels was evaluated on a 0.3-m-dia Westinghouse commercial combustor.nitrogen content while combustor wall temperature and smoke are related to hydrogen deficiency (i.e., aromaticity) of the CDL fuels. For both the PDS and CDL fuels, aromaticity is defined as the percentage of aromatic carbon atoms in the fuel relative to the

The Electric Power Research Institute is conducting a program to develop combustion turbine burners for high-bound nitrogen, highly aromatic, low hydrogen/carbon ratio coal derived liquids. The problems of fueling standard units with these liquids are being determined, with special emphasis on environmental aspects. Small-scale and full-scale laboratory combustor tests are described. Results from earlier tests are surveyed, especially with regard to smoke production NOx emissions and flame radiation. A unique feature of the present program is the stress on developing surrogate petroleum-derived fuel to “stand-in” for scarce coal liquids during early development of the advanced burners needed to handle a broad range of coal liquids.