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This experimental work includes the co-combustion of Soma lignite with biochar obtained from red pine sawdust. The experiments were carried out in a circulating fluidized bed combustion (DAY) system with a thermal capacity of 30 kW, in air and in an oxygen-rich air atmosphere. In this study, the combustion temperature in the fluidized bed was kept at 850 + 50 °C. Combustion tests of Soma lignite and biochar mixtures at different rates were carried out in an oxygen-rich medium. It was concluded that 300 °C and 30 minutes processing conditions for red pine sawdust would be the most suitable production conditions for the co-combustion of soma lignite and biochar in a fluidized. The share of biochar mixture in lignite has been increased up to 50%. by weight. It was found that the biochar was burned effectively when the mixture of biochar was up to 50%. The obtained results emphasized that biochar can be a good additive fuel for co-combustion of coal and biochar. It has also shown that co-combustion in an oxygen-rich atmosphere is a choice to decrease stack emissions of SO2, CO and N2O. Addition of oxygen to air increased the combustion efficiency and reduced CO emissions. Since biocoal does not have sulfur in it significantly reduced SO2 emissions. However, emissions of NOx increased with high oxygen concentrations and high levels of biocoal addition. [ABSTRACT FROM AUTHOR]