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In biomass harvesting and fuel preparation processes, grinding causes a prominent energy consumption penalty, which results in an analogous cost impact. This is due to the fibrous and tenacious nature of biomass. Torrefaction of biomass makes it brittle, as it diminishes its fibrous nature and, hence, it enhances its grindability. Nevertheless, grinding costs are still important and increase with...
This work examined acid gas emissions of sulfur dioxide, nitrogen oxide, carbon dioxide, and hydrogen chloride from co-firing biomass (corn straw and rice husk) with either a high-sulfur bituminous coal or a low-sulfur sub-bituminous coal. Pulverized neat coals, neat biomass, either raw or torrefied, and 50–50wt% blends thereof were introduced to a laboratory-scale electrically-heated drop-tube furnace...
Experiments and subsequent analysis were conducted to gain insight into combustion phenomena of raw and torrefied biomass chars, and to describe the char combustion phase with respect to their frequently discussed non-spherical particle shape. Torrefied beech wood and miscanthus were burned in a laminar flow reactor at high heating rates (104–105K/s). A stereoscopic imaging pyrometry system was used...
The pyrolysis and combustion characteristics of two disparate kinds of pulverized biofuels, (i) Miscanthus which is an herbaceous biomass and (ii) Beechwood which is a woody biomass, were investigated at high heating rates and high temperatures. Both materials were burned in either raw or torrefied (at 275°C for 30min) states. The particles were in the nominal range of 160–200μm, as classified by...
This research examined the reduction of combustion-generated sulfur dioxide and nitrogen oxide emissions from a pulverized high-sulfur bituminous coal by co-firing it with a lignite coal and by substituting air with O2/CO2 gases, of compositions pertinent to dry once through oxy-fuel combustion conditions. Oxygen mole fractions were in the range of 21–30%. The neat bituminous and lignite coals as...
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