Co-combustion characteristics and blending optimization of tobacco stem and high-sulfur bituminous coal based on thermogravimetric and mass spectrometry analyses

► We propose an optimum blending ratio for co-combustion of tobacco stem and coal. ► We examine differences of combustion behaviors between tobacco stem and coal. ► Ignition property remains unchanged, but then improves as tobacco stem content rises. ► Burnout property improves initially, but worsens as tobacco stem content increases. ► Benefits from reductions of CO2 and SO2 emissions by blending don't extend to NO2.