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Integration of solvent deasphalting and asphaltenes gasification has been reported as a convenient alternative to coker based upgrading of bitumen, derived from oil sands. However, very limited work has been carried out on pyrolysis and gasification of asphaltenes at entrained flow conditions. The present study aims at addressing this gap, and provides a better understanding of the major intermediate...
Co-pyrolysis of red oak and high density polyethylene (HDPE) was conducted in a laboratory-scale, continuous fluidized bed reactor in a temperature range from 525 to 675°C. Pyrolysis products, including two fractions of pyrolysis-oil, non-condensable gases and char were analyzed to assess the influence of pyrolysis temperature and co-feeding of biomass with HDPE. It was found that increasing pyrolysis...
This research investigates the catalytic properties of char which was recovered directly from a biomass gasifier. Poplar wood was gasified in steam and CO2 environments in a fluidized bed reactor at temperatures ranging from 550 to 920°C. Char was composed of 85% carbon with concentrations of N, H, and S between 0.3% and 3%, depending on gasification conditions. The inorganics (Ca, K, Na, P, Si, Mg)...
Single char particles with a diameter of 8mm were produced in situ from pellets of raw and torrefied pine shell, olive stones and straw. The single char particles were then gasified at 800, 900 and 1000°C in two or three CO2 concentrations at each temperature. In the experiments, CO concentrations were measured from the product gases. From the measured CO concentrations, the char conversions versus...
The aim of this paper was to determine the capability for metal elution that may constitute potential contamination to the water environment from post-process cavern residue after underground coal gasification (UCG).Samples of raw coals that had been subjected to gasification (three samples of hard coal, the coal mine “Bobrek”, the experimental mine “Barbara” and the coal mine “Piast”, and a sample...
In an entrained-flow gasifier, the captured char particles, which were prolonged the residence time on the molten slag surface, continued to react with the gaseous reactant and affected the carbon conversion of a gasifier. In this paper, we applied a high temperature stage microscope (HTSM) and an ImageJ software to study the gasification characteristics of char particles with CO2 on the molten slag...
Tar removal is one of the major challenges in implementation of biomass gasification technology. Syngas tars causes formation of aerosols and soots, which plug filters, reactors and fuel lines. In this study, a char-derived catalyst was tested in removal of tar produced from pyrolysis of kraft lignin in a pyroprobe reactor. The effects of reaction temperature (700, 800 and 900°C), water amount (5–10μl),...
The reactivity of brown coal chars for low temperature steam gasification and the chemical forms and distribution of the naturally occurring calcium species between the bulk and the surface of chars and the evolution on carbonization and steam gasification were studied in this paper. The char surface was shown to be significantly enriched with calcium compared to bulk matter. Aragonite-like species...
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