Rice hulls and straw are becoming one of the largest agricultural waste residues in the world. Due to the high ash content (18-30%, of which up to 90% is typically of silica content, which can create clinkers) and the lower void space of the bulk material, the gasification of rice hulls requires engineering consideration separate from that of other types of woody biomass such as shells, softwoods, etc.

Rice hull scientific paper library:

Analysis of Volatile Constituents of Rice Hull Liquid Smoke

This paper reviews the compounds present in the pyrolysis of rice hulls around 200-300C. The characteristic of liquid smoke from rice hulls is different from that of softwoods.

Xiong, Lia. Burning Temperature Dependence of Rice Husk Ashes in Structure and Property.pdf