Effects of Bio-Coal Briquette for Residential Combustion on Brown Carbon Emission Reduction

Biomass burning is an important source of brown carbon (BrC) which poses high-risk threats to human health and the environment. In this study, bio-coal briquette (coal mixed with biomass), a promising solid fuel for residential combustion, proven be clean can effectively reduce BrC emission. First all, orthogonal experiment three factors levels on physical property bio-briquette was carried out identify optimal preparation conditions including ratio biomass anthracite, particle size molding pressure. Then combustion briquetted implemented in simulated system. emission (EFs) were calculated based detected black (BC) concentration by aethalometer, other optical characteristics organic components extract samplers, such as mass absorption efficiency (MAE) angstrom index (AAE), also explored. Lastly, composition analysis gas chromatography (GC) tandem spectrometer (MS) direct visible images scanning electron microscopy (SEM) investigated provide more detail information EFs change. It shown that had low 70–81% reduced comparison interpolation value 100% coal. Furthermore, from different, consisted substances strong wavelength dependence. Consequently, although MAE declined 60% at 540 nm wavelength, AAE only decreased slightly compared values. To specific, tar balls, main existing form BrC, distributed much sparsely SEM image briquette. sum up, positive reduction effect discovered evident serve alternative beneficial both atmosphere.