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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.

Comparative tests have been made in combustion turbine burners between six coal derived liquid (CDL) fuels and No. 2 distillate oil. All CDL fuels were evaluated in a half-scale (by diameter) combustor test rig, while one CDL fuel was also evaluated in a full scale high pressure combustion rig. The effects of these fuels on emissions of smoke and oxides of nitrogen, and on combustor metal temperature are discussed. Also observed in the testing were flame radiation, post-test combustor cleanliness, and emissions of carbon monoxide and hydrocarbons. Two of the CDLs do appear to be within the tolerance band which present combustion turbines can accept, with the exception of elevated NOx emissions. This work is part of an Electric Power Research Institute program to develop burners for coal derived liquids.