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The purpose of this study was to utilize gasification derived char as a catalyst support for tar removal. Red cedar char collected from downdraft bed gasification was chemically activated into activated carbon and impregnated with nickel acetate and nickel nitrate. The effects of nickel salts precursor, nitric acid treatment of support and reduction of nickel in hydrazine medium on catalyst performance...
We have investigated the role of ash forming elements on the conversion of char-N to NO. The NO release was measured from combustion of single biomass particles, both in their raw state and after demineralization. The investigated biomasses were: dried distiller’s grain with soluble (DDGS), sunflower seed, softwood, straw and torrefied wood. For three of the five raw biomasses, the NO release increased...
Birch wood was leached of its naturally occurring ash forming elements and doped with three concentrations of calcium or potassium before being gasified in a laboratory bubbling fluidized bed reactor. The wood samples were pelletized and inserted into a fluidized bed reactor where they were first pyrolyzed with N2 and then gasified with CO2. In addition to tracking the gas concentration of the exit...
The aim of this work was to investigate char structure dependency on parent coal rank expressed by the formation enthalpy. For this purpose, a detailed characterization of eleven char samples obtained under the same pyrolysis conditions was performed. The porous structure was investigated in terms of micro-, meso- and macropores by employing nitrogen adsorption at 77K, carbon dioxide adsorption at...
In a previous work [Heuer et al., 2016] a large production of a fluffy carbon-rich material was observed to accompany the char formed during the early stages of a medium rank (bituminous) coal pyrolysis in a drop tube furnace (1573K, residence times < 130ms). This peculiar material was found to be much more abundantly formed in CO2 than in N2 flow. SEM analysis showed that it contains a large portion...
The purpose of this work is the kinetic study of biomass char combustion in isothermal conditions in TGA. This char was obtained from fast pyrolysis of beech bark pellet in a fluidized bed reactor at 850°C and atmospheric pressure. Kinetic study of isothermal char combustion was performed for temperatures up to 400°C, oxygen partial pressures ranging from 5065 to 21,273Pa and a char particles size...
The study examined the impact of the process of underground gasification on the petrographic composition of lignite from the Turów deposit. The lignite fed into the reactor is mainly xylodetritic and sapropelic lignite.As a result of the gasification process in the reactor, a cavern and lignite residues were formed. The samples collected from the individual areas were subjected to a detailed petrographic...
The available data on intrinsic kinetic parameters of wood char combustion is limited in the literature. The intrinsic reactivity of porous char particles reflects the variance in the pore structure resulted from various compositions of parent biomass or coal fuels. In this study detailed kinetic models for calculating the intrinsic reaction rate and the Arrhenius parameters in two combustion zones...
Two typical types of bituminous coal (JN and SH) were employed for thorough devolatilization, then the samples were functionalized by O2 at 1073K to different conversion ratios (JN: 0.21, 0.34, 0.40, 0.53 and 0.63; SH: 0.15, 0.22, 0.32, 0.42 and 0.52) before the surface oxygen containing complexes C(O) were qualitatively and semi-quantitatively characterized by Fourier transform infrared spectroscopy...
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