Browsing Mechanical Engineering (Scholarly Articles) by Author "Trubetskaya, Anna"
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Categorization of tars from fast pyrolysis of pure lignocellulosic compounds at high temperature
Trubetskaya, Anna; Souihi, Nabil; Umeki, Kentaro (Elsevier, 2019-04-11)This study presents how the yields of different tar compounds from pure lignocellulosic compounds respond to the change in temperature and residence time. Experiments were carried out with a drop tube furnace in the ... -
Characterization and reactivity of charcoal from high temperature pyrolysis (800–1600 °C)
Surup, Gerrit Ralf; Nielsen, Henrik K.; Heidelmann, Markus; Trubetskaya, Anna (Elsevier, 2018-09-22)This study presents the effect of wood origin and heat treatment temperature on the CO2 reactivity, nanostructure and carbon chemistry of chars prepared at 800, 1200, and 1600 °C in slow pyrolysis reactors. The ... -
Characterization and reactivity of soot from fast pyrolysis of lignocellulosic compounds and monolignols
Trubetskaya, Anna; Brown, Avery; Tompsett, Geoffrey A.; Timko, Michael T.; Kling, Jens; Broström, Markus; Andersen, Mogens Larsen; Umeki, Kentaro (Elsevier, 2018-02-06)This study presents the effect of lignocellulosic compounds and monolignols on the yield, nanostructure and reactivity of soot generated at 1250 C in a drop tube furnace. The structure of soot was characterized by electron ... -
Characterization of free radicals by electron spin resonance spectroscopy in biochars from pyrolysis at high heating rates and at high temperatures
Trubetskaya, Anna; Jensen, Peter Arendt; Jensen, Anker Degn; Glarborg, Peter; Larsen, Flemming Hofmann; Andersen, Mogens Larsen (Elsevier, 2016-09-06)The concentration and type of free radicals from the decay (termination stage) of pyrolysis at slow and fast heating rates and at high temperatures (above 1000°C) in biomass char have been studied. A room-temperature ... -
Characterization of renewable reductants and charcoal-based pellets for the use in ferroalloy industries
Surup, Gerrit; Vehus, Tore; Eidem, Per-Anders; Trubetskaya, Anna; Nielsen, Henrik Kofoed (Elsevier, 2018-11-05)This study investigates the effect of high-temperature pyrolysis and post-treatment processes on spruce and oak charcoal yields and CO2 reactivity in a slow pyrolysis reactor. Post-treatment processes such as co-pyrolysis ... -
Characterization of woodstove briquettes from torrefied biomass and coal
Trubetskaya, Anna; Leahy, James J.; Yazhenskikh, Elena; Müller, Michael; Layden, Peter; Johnson, Robert; Ståhl, Kenny; Monaghan, Rory F.D. (Elsevier, 2019-01-18)Using waste biomass materials offers the potential to reduce the greenhouse gas emissions from fossil fuels. Torrefaction is very useful for improving the fuel properties of biomass in order to better match those of coal. ... -
Comparison of high temperature chars of wheat straw and rice husk with respect to chemistry, morphology and reactivity
Trubetskaya, Anna; Jensen, Peter Arendt; Jensen, Anker Degn; Steibel, Markus; Spliethoff, Hartmut; Glarborg, Peter; Larsen, Flemming Hofmann (Elsevier, 2016-03-02)Fast pyrolysis of wheat straw and rice husk was carried out in an entrained flow reactor at high-temperatures (1000–1500) °C. The collected char was analyzed using X-ray diffractometry, N2-adsorption, scanning electron ... -
Effect of fast pyrolysis conditions on biomass solid residues at high temperatures
Trubetskaya, Anna; Jensen, Peter Arendt; Jensen, Anker Degn; Garcia Llamas, Angel David; Umeki, Kentaro; Glarborg, Peter (Elsevier, 2015-12-03)Fast pyrolysis of wood and straw was conducted in a drop tube furnace (DTF) and compared with corresponding data from a wire mesh reactor (WMR) to study the influence of temperature (1000–1400)°C, biomass origin (pinewood, ... -
The effect of feedstock origin and temperature on the structure and reactivity of char from pyrolysis at 1300 2800 °C
Surup, Gerrit Ralf; Foppe, Manuel; Schubert, Daniel; Deike, Rüdiger; Heidelmann, Markus; Timko, Michael T.; Trubetskaya, Anna (Elsevier, 2018-07-31)This study reports the effect of feedstock origin, residence time, and heat treatment temperature on CO2 and O2 reactivities, nanostructure and carbon chemistry of chars prepared at 1300, 1600, 2400, and 2800 °C in a slow ... -
Effect of microwave and thermal co-pyrolysis of low-rank coal and pine wood on product distributions and char structure
Abdelsayed, Victor; Ellison, Candice R.; Trubetskaya, Anna; Smith, Mark W.; Shekhawat, Dushyant (American Chemical Society, 2019-07-07)Direct conversion of a low-rank coal into valuable chemicals or improving its char’s coking value became very demanding goals in coal utilization strategies. In this work, the co-pyrolysis of a low-rank lignite coal and ... -
Effects of several types of biomass fuels on the yield, nanostructure and reactivity of soot from fast pyrolysis at high temperatures
Trubetskaya, Anna; Jensen, Peter Arendt; Jensen, Anker Degn; Garcia Llamas, Angel David; Umeki, Kentaro; Gardini, Diego; Kling, Jens; Bates, Richard B.; Glarborg, Peter (Elsevier, 2016-03-24)This study presents the effect of biomass origin on the yield, nanostructure and reactivity of soot. Soot was produced from wood and herbaceous biomass pyrolysis at high heating rates and at temperatures of 1250 and 1400 ... -
Influence of fast pyrolysis conditions on yield and structural transformation of biomass chars
Trubetskaya, Anna; Jensen, Peter Arendt; Jensen, Anker Degn; Steibel, Markus; Spliethoff, Hartmut; Glarborg, Peter (Elsevier, 2015-09-19)Fast pyrolysis of biomass (wood, straw, rice husk) and its major components (cellulose, hemicellulose, lignin) was conducted in a wire mesh reactor. The aim of this study was to understand the influence of temperature ... -
Modeling the influence of potassium content and heating rate on biomass pyrolysis
Trubetskaya, Anna; Surup, Gerrit; Shapiro, Alexander; Bates, Richard B. (Elsevier, 2017-03-14)This study presents a combined kinetic and particle model that describes the effect of potassium and heating rate during the fast pyrolysis of woody and herbaceous biomass. The model calculates the mass loss rate, over a ... -
The nature of stable char radicals: An ESR and DFT study of structural and hydrogen bonding requirements
Trubetskaya, Anna; Larsen Andersen, Mogens; Talbro Barsberg, Søren (Wiley, 2018-06-28)Pyrolysis is a promising way to convert biomass into fuels and chemicals. This reaction is complex and inevitably involves a cascade of radical reactions that lead to char formation, in which some radicals become trapped ... -
One way of representing the size and shape of biomass particles in combustion modeling
Trubetskaya, Anna; Beckmann, Gert; Wadenbäck, Johan; Holm, Jens Kai; Velaga, Sitaram P.; Weber, Roman (Elsevier, 2017-06-29)This study aims to provide a geometrical description of biomass particles that can be used in combustion models. The particle size of wood and herbaceous biomass was compared using light microscope, 2D dynamic imaging, ... -
Potassium and soot interaction in fast biomass pyrolysis at high temperatures
Trubetskaya, Anna; Larsen, Flemming Hofmann; Shchukarev, Andrey; Ståhl, Kenny; Umeki, Kentaro (Elsevier, 2018-04-02)This study aims to investigate the interaction between potassium and carbonaceous matrix of soot produced from wood and herbaceous biomass pyrolysis at high heating rates at 1250°C in a drop tube reactor. The influence of ... -
Prediction of fast pyrolysis products yields using lignocellulosic compounds and ash contents
Trubetskaya, Anna; Timko, Michael T.; Umeki, Kentaro (Elsevier, 2019-10-26)The effects of lignocellulosic biomass composition on product yields and distributions were studied under high-temperature pyrolysis conditions (800–1250 C) in a drop tube reactor. Several types of biomass were studied ... -
Removal of phenol and chlorine from wastewater using steam activated biomass soot and tire carbon black
Trubetskaya, Anna; Kling, Jens; Ershag, Olov; Attard, Thomas; Schröder, Elisabeth (Elsevier, 2018-10-30)This study aims to demonstrate a novel method for removing toxic chemicals using soot produced from wood and herbaceous biomass pyrolyzed in a drop tube reactor and tire pyrolytic carbon black. The influence of ash content, ... -
Secondary comminution of wood pellets in power plant and laboratory-scale mills
Trubetskaya, Anna; Poyraz, Yunus; Weber, Roman; Wadenbäck, Johan (Elsevier, 2017-03-14)This study aims to determine the influence of mill type and pellet wood composition on particle size and shape of milled wood. The size and shape characteristics of pellets comminuted using power plant roller mills were ...