PRELIMINARY CHARACTERIZATION OF RESIDUAL CHAR AFTER GASIFICATION OF RICE STRAW

Abstract

Rice straw is the most abundant agricultural waste in Vietnam. Utilizing rice
straw for energy purposes through biomass gasification technology is an
advanced solution. However, current biomass gasification technologies have
relatively low efficiency and generate a significant amount of excess char after the
gasification process. In this study, residual char from rice straw gasification in a
commercial system was collected and analyzed to provide a basis for reutilization.
Proximte and ultimate analysis revealed that the char from rice straw gasification
has high ash content, but substantial carbon content remains. SEM-EDX analysis
showed that the char has a relatively complex structure with various inorganic
particles present on the surface. Furthermore, the rice straw char has a high
porous structure, as indicated by its specific surface area (438m2
/g), determined
using the nitrogen adsorption method. The physico-chemical properties of the rice
straw char after gasification demonstrate its suitability as an inexpensive and
environmentally friendly adsorbent material.