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Slagging and fouling during coal and biomass cofiring: chemical equilibrium mod...

A thermodynamic model was applied to foresee the occurrence of fouling, slagging, and bed agglomeration phenomena during fluidized bed monocombustion of three different types of biomass, namely straw pellets, olive cake, and wood pellets. The cocombustion effect in reducing the occurrence of deposits and agglomerates of blends of 5, 15, and 25% (wt.) biomass with coal was also assessed. Chemical fractionation w...

Carbon-based materials prepared from pine gasification residues for acetaminoph...

Fly ash, a residue produced frompine gasification,was used as precursor of carbon-basedmaterials assayed in acetaminophen adsorption. Materials prepared by activation with K2CO3, presented high porosity development (ABET 1200m2 g1) and samples calcined at 900 C presented high volumes of large micropores and mesopores. Kinetic and equilibrium acetaminophen adsorption data showed that the process obeys to the pse...

Biomass fly ashes as low-cost chemical agents for Pb removal from synthetic and...

The main aim of this work was to study the removal efficiency of Pb from synthetic and industrial wastewaters by using biomass fly ashes. The biomass fly ashes were produced in a biomass boiler of a pulp and paper industry. Three concentrations of Pb2+ were tested in the synthetic wastewater (1, 10 and 1000 mg Pb/L). Moreover, two different wastewaters were collected in an industrial wastewater treatment plant ...

Biomass quality in a thermoelectric plant along one year

ABSTRACT: The biomass quality is an important issue for the operation of a thermoelectric plant. Independently of the combustion technology, the biomass fuels and its characteristics are responsible for some operating problems during the thermochemical conversion of the biomass in thermal energy. These operation problems are related to the boiler and heat exchangers, dedusting technologies (e.g., electrostatic ...

Uncertainty estimation to evaluate mass balances on a combustion system 

Mass balances of ash and potassium for a fluidized bed combustor were performed incorporating measurement uncertainties. The total output mass of ash or a chemical element should be equal to the mass in the input fuel; however, this is not often achieved. A realistic estimation of recovery uncertainty can support the reliability of a mass balance. Estimation of uncertainty helps to establish a reliable evaluati...

Evaluation of slagging and fouling tendency during biomass co-firing with coal ...

Over the last decades, several indices based on ash chemistry and ash fusibility have been used to predict the ash behaviour during coal combustion, namely, its tendency for slagging and fouling. However, due to the physicalechemical differences between coals and biomass, in this work only the applicability of an ash fusibility index (AFI) to the combustion and co-combustion of three types of biomass (straw pel...

Use of chemical fractionation to understand partitioning of biomass ash constit...

Three species of biomass origin (straw pellets, olive cake and wood pellets) and two coals from different countries (Coal Polish and Coal Colombian) have been studied to understand the fate of their ash forming matter during the combustion process and to investigate the influence of co-firing biomass with coal. Three different approaches to investigate the ash behaviour were employed: (1) chemical fractionation...

Comparison of a pilot scale gasification installation performance when air or ...

Chemical and ecotoxicological properties of ashes produced in the co-combustion...

Use of chemical fractionation to understand partitioning of biomass ash constit...