Modeling of alkali metal release during biomass pyrolysis

• The release of alkali metals (Na and K) during biomass pyrolysis was numerically and experimentally investigated using Laser-Induced Breakdown Spectroscopy technique that could extend the measurements of alkali metal concentration to the sooty pyrolysis stage. Two distinct peaks of metal concentrations were observed at the pyrolysis stage and at the gasification stage. Since during the pyrolysis stage a large temperature gradient exists inside the particle numerical simulations were performed to elucidate the experimental measurements and extract the kinetic data. For Na and K release the activation energies were in the range of 218 to 248 kJ/mole and 168 and 198 kJ/mole respectively. Equilibrium calculations were performed to identify the stable Na and K compounds and their phases during the pyrolysis stage of the particle.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Energiteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Energy Engineering (hsv//eng)

Keyword

Alkali metal release

Biomass

In situ measurement

LIBS

Pyrolysis

Publication and Content Type

art (subject category)

ref (subject category)