This paper presents hydrogen sulfide (H_2S) formation characteristics on the pulverized coal combustion of two bituminous coals with different sulfur release. The sulfur released from coal to the gaseous phase in the near-burner region is affected by the forms of sulfur. The organic sulfur is readily released compared to the other forms of sulfur. When the blends of two bituminous coals with different sulfur release are fired, H_2S concentration in the near-burner region coincide with the value estimated by the blending ratio, and concentrations of H_2S and SO_2 in the upstream region of the two-stage combustion air ports are in the chemical equilibrium.
