Assessment of mercury emissions from brazilian coal combustion in fast fluidized bed / Estudo das emissões de mercurio na combustão de carvão mineral brasileiro em leito fluidizado rapido

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

In this work, total mercury emissions from fast fluidized bed combustion of CE-4500 Brazilian coal and dolomite mixtures were quantified. Stack gas samples were collected downstream of a baghouse by using an isokinetic probe and U.S. E.P.A. n. 29 / ASTM-D-6784 (Ontario-Hydro) method procedures. The ash samples trapped in the particulate control device and those accumulated in the bottom of the reaction chamber were also analyzed. A cold-vapor atomic fluorescence spectrophotometer was employed to determine the mercury concentration in the stack gas and ash samples. Additional experimental information about the combustion process was obtained, such as, pressure and temperature axial profiles, O2, CO and NOx concentrations in the exhaust gas, baghouse performance and carbon conversion efficiency. Results showed that approximately 6% of the total mercury released by the process in gaseous and particulate form was emitted from the stack, and this level was not affected by the amount of dolomite being used. A deviation close to 40% in the mercury mass balance for the process was verified. Results were satisfactory taking into consideration the inherent difficulties to quantify small concentrations of the pollutant in the process

ASSUNTO(S)

carvão - combustão mercury emissions coal /x combustion fast fluidized bed combustão em leito fluidizado mercurio

ACESSO AO ARTIGO

Documentos Relacionados