The flue dust conveyed by the flue gas in the combustion plant of a coal-fired power station still contains up to 50 % combustible material. In order to attain high efficiency by full burning, in modern coal-fired power stations with slag tap firing the flue dust is returned to the combustion chamber. This increases the average time spent by a particle of coal or dust in the firing circuit. The invention provides a process for operating a combustion plant of a coal-fired power station operating on the slag tap firing process and a combustion installation operating thereby with a slag tap in which a titanium-containing material is conveyed in addition to the coal to accelerate the full burning of the coal. The fuel throughput is thus increased, resulting in an increase in the efficiency of the power station.
