Encontrados 26 documentos, a visualizar página 1 de 3

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...

Hydrogenation of rapeseed oil for production of liquid bio-chemicals

The main objective of rapeseed oil hydrogenation tests was the production of liquid bio-chemicals to be used as renewable raw material for the production of several chemicals and in chemical synthesis to substitute petroleum derived stuff. As, hydrogenation of vegetable oils is already applied for the production of biofuels, the work done focused in producing aromatic compounds, due to their economic value. The...

Effect of syngas composition on hydrogen permeation through a Pd–Ag membrane

Hydrogen separation from a syngas mixture with different compositions was studied by using a Pd–Ag membrane. The effect of temperature (from 300 C to 600 C) and of relative pressure (from 0.2 MPa to 0.5 MPa) was studied. In general, rises of both these parameters allowed increasing H2 permeate flux. The Pd–Ag membrane showed to have a great selectivity, as when inlet gas mixture contained different compositio...

PCDD/F formation in the co-combustion with biomass and coal: the influence of c...

The reduction of CO2 emissions is the primary goal of partially replacing coal with Renewable Energy Sources (RES) of biomass origin, accompanied with the reduction of emissions of other pollutants. At the same time, there are advantages in mixing this particular resource - solid biomass - with coal, due to positive synergies arising from the introduction of different amounts of volatile matter, ash, sulphur, c...

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...

Materiais para caldeiras e turbinas de centrais termoeléctricas avançadas

reduzir a emissão de CO2 para a atmosfera, a qual contribui grandemente para o aquecimento global. Nas centrais termoeléctricas, o aumento da eficiência energética conduz à redução da emissão de CO2. Assim, encontram-se actualmente em desenvolvimento unidades produtoras de energia através da queima de combustíveis fósseis, com elevada eficiência energética, com funcionamento a uma pressão do vapor de cerca de 3...

Study of the slow batch pyrolysis of mixtures of pin, plastics and tires