Experimental study on combustion and pollutants emissions of oil sludge blended with microalgae residue

Abstract

Experimental study on co-combustion of oil sludge (OS) and microalgae residue (MR) was conducted with a thermogravimetric analyzer and a designed fluidized bed reactor system. Combustion process of OS blended with MR could be divided into four stages, water evaporation, volatiles release and combustion, fixed carbon combustion and minerals decomposition. With MR ratio increasing, combustion performance of the mixture became better. MR addition can help improve the combustion performance of OS. NOx and SO2 concentrations increased firstly and then decreased with the increase of combustion temperature which ranged from 800 to 1100 °C. With the increase of excess air ratio α, NOx and SO2 emissions increased. Generally, NOx and SO2 emissions decreased with MR ratio increased at 800 °C, which is caused by the catalysis effect of ash and heavy metals in OS. OS blended with MR could both improve combustion performance and help reduce NOx and SO2 emissions during OS combustion, which provides an effective approach to massive synergistic disposal of waste resources.