K and Ca elements in the biomass are in the form of inorganic and organic matter. AAEM species affect the chain scission and depolymerization process during the biomass pyrolysis of lignin

cellulose and hemicellulose molecules. To a certain extent

it affects the formation and transformation of biomass pyrolysis gas. In the process of pyrolysis reaction

the intermediate transient product has a very important significance for the formation of final product during the pyrolysis reaction. In this paper

biomass (rice husk) was treated with acid washing

and then the directional load of K

Ca elements

respectively. By using Py-GC/MS in the pyrolysis temperature of 500—900℃

the experimental study on rapid pyrolysis of biomass was carried out. By gas chromatography mass spectrometry (GC/MS)

a semi quantitative analysis was made on the types and contents of light hydrocarbons and oxygen-containing species. It explained the effect of K and Ca elements on the transient light hydrocarbons and oxygen-containing species during biomass fast pyrolysis and the formed mechanism transformation of pyrolysis gas phase. At low temperature (≤600℃)

fast pyrolysis instantaneous gas products of H-form

K-loaded and Ca-loaded biomass were mainly CO

CO2 and CH4. K and Ca elements promoted the generation of CO and CO2. However

at high temperature (≥700℃)

C3H6 became the main transient gas products. Ca element had a certain promotion effect on the formation of C3 (C3H6)

while K element inhibited the generation of C3H6.