RELEASE OF POTASSIUM, SODIUM, CHLORINE, SULPHUR AND PHOSPHORUS SPECIES FROM GASIFICATION OF WOODY BIOMASS AND BIOMASS RESIDUES

摘要

The objective of this work was to investigate the influence of the composition of biomass on the release of different trace elements during gasification. To cover a broad range of fuels three types of woody biomass and four types of biomass residues were used. The present experiments were performed at different temperatures (1200-1400 °C), under gasification like conditions. The experiments were carried out in an atmospheric flow channel reactor furnace. For the determination of the composition of the product gas, the flow channel reactor was coupled to a molecular beam mass spectrometer (MBMS). The hot gases were directly analysed in real-time by MBMS. The focus was on the alkali metals (K and Na) and on the non metals (S, Cl and P) that are expected to affect the solid and gas phase chemistry and volatility of the other elements. The main gaseous species were: ~(36)HCl~+, ~(58)NaCl~+, ~(74)KCl~+,~(64)SO_2~+, ~(34)H_2S~+, ~(60)COS~+, and ~(63)PO_2~+. After quantification, the data set was correlated with the elemental composition of the biomass and the release mechanisms are discussed.