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The Model SB30 gas turbine was redesigned for operation on low calorie coal gas in a gasification combined plant. A series of sub-scale combustor tests were conducted in advance of design of an actual combustor. Consequently, a new combustor which is capable of burning low calorie coal gas as well as distillate was developed for this application. A moderate mixing process within the main combustion zone is required for maintaining combustion of low calorie gas which essentially has poor combustibility. On the other hand, the moderate mixing may cause visible emissions when the gas turbine is operated on distillate oil. In order to satisfy these opposing requirements, three major modifications were adopted in this combustor. First of all the combustion intensity and the pressure loss were lowered, in comparison to a conventional combustor, to burn low calorie coal gas stably. Secondly, an airblast atomizer which has some advantages to reduce visible emissions was equipped. Finally, a variable airflow distribution system was introduced so that the mixing intensity can be adjusted for each fuel. The shop test of an actual gas turbine with kerosene and No.4 fuel demonstrated the sufficient effect of this variable airflow distribution system on reduction of visible emissions.