Overview of Methods to Remove Solid Particles from Biomass Fast Pyrolysis Oils

Fast pyrolysis of biomass to produce bio-oil is an important technology to utilize lignocellulosic biomass materials, as it offers a convenient way to convert solid biomass mainly into the liquid bio-oil. Bio-oil is regard as a promising candidate of petroleum fuels, but it is a low-grade liquid fuel and difficult to be used in various thermal devices, due to the presence of many undesirable components. One of the undesirable components is the solid particles, resulting from insufficient separation of the pyrolytic products. The solid particles will bring many negative effects to the storage and combustion of bio-oil, and thus, should be removed. This paper reviews the recent progress on the removal of solid particles, through the filtration of liquid bio-oil or pyrolysis vapors.