In order to investigate the combustion characteristics of low-quality Turkish lignites in atmospheric fluidised-bed combustors, steady-state experiments were conducted in a 0.25 m diameter fluidised bed burning Seyitomer lignite. The excess-air ranged from 0 to 72%, and the bed temperature from 1049 to 1173 K. Spatial distributions of gas constituents and temperature were measured in both the bed and the freeboard. The combustion efficiency was found to rise with bed temperature and excess air for the operating range under consideration. Oxygen consumption in the freeboard was approximately 23% in all the experiments. The results showed that 60% of total heat removed was extracted by the bed coil, and that heat-transfer coefficients for the in-bed coil ranged from 130 to 200 W M-2 K-1 and for the freeboard coil remained approximately constant at 40 W M-2 K-1.