Author
Emad Rokni
Bio: Emad Rokni is an academic researcher from Northeastern University. The author has contributed to research in topics: Combustion & Biomass. The author has an hindex of 11, co-authored 23 publications receiving 406 citations.
Topics: Combustion, Biomass, Coal, Straw, Torrefaction
Papers
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TL;DR: In this paper, the authors 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 coalition.
148 citations
TL;DR: In this article, 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 O 2 /CO 2 gases, of compositions pertinent to dry once through oxy-fuel combustion conditions.
53 citations
TL;DR: In this article, a shadowgraph system equipped with a high speed CMOS camera was used to study flame structures and transition from smooth to cellular flames during flame propagation, and burning speeds were measured using a thermodynamic model employing the dynamic pressure rise during the flame propagation.
Abstract: Laminar burning speeds and flame structures of spherically expanding flames of mixtures of acetylene (C2H2) with air have been investigated over a wide range of equivalence ratios, temperatures, and pressures. Experiments have been conducted in a constant volume cylindrical vessel with two large end windows. The vessel was installed in a shadowgraph system equipped with a high speed CMOS camera, capable of taking pictures up to 40,000 frames per second. Shadowgraphy was used to study flame structures and transition from smooth to cellular flames during flame propagation. Pressure measurements have been done using a pressure transducer during the combustion process. Laminar burning speeds were measured using a thermodynamic model employing the dynamic pressure rise during the flame propagation. Burning speeds were measured for temperature range of 300–590 K and pressure range of 0.5–3.3 atm, and the range of equivalence ratios covered from 0.6 to 2. The measured values of burning speeds compared well with existing data and extended for a wider range of temperatures. Burning speed measurements have only been reported for smooth and laminar flames. [DOI: 10.1115/1.4028363]
44 citations
35 citations
TL;DR: In this paper, corn straw biomass was torrefied in carrier gases which contain oxygen and carbon dioxide gases with the following proportions (3-7% O2, 13-17% CO2, 80% N2).
26 citations
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TL;DR: A comprehensive review of the progress in biomass torrefaction technologies is provided in this article, where the authors perform an in-depth literature survey and identify a current trend in practical tor-refaction development and environmental performance.
357 citations
TL;DR: In this paper, the authors compared gaseous emissions of carbon, sulfur and nitrogen oxides from combustion of several types of biomass including woody, herbaceous and crop-derived wastes, pulverized in the size range of 75-150μm.
155 citations
TL;DR: In this paper, the authors 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 coalition.
148 citations
01 Nov 2014
TL;DR: In this article, the fuel characteristics of food waste at torrefaction temperatures ranging from 150 to 600°C, for torref reaction residence time varying from 0 to 50min in a horizontal tubular reactor were characterized in terms of their elemental composition, energy yield, ash content and volatile fraction.
Abstract: Abstract Torrefaction of biomass under anoxic condition can produce an energy dense and consistent quality solid biomass fuel for combustion and co-firing applications. This paper investigates the fuel characteristics of food waste at torrefaction temperatures ranging from 150 to 600 °C, for torrefaction residence time varying from 0 to 50 min in a horizontal tubular reactor. The torrefied products were characterized in terms of their elemental composition, energy yield, ash content and volatile fraction. The gaseous products from torrefaction of food waste were also analyzed. Thermogravimetric analysis was carried out in order to obtain the kinetic parameters for the torrefaction reaction of food waste. It was found that the food waste undergoes changes in their physical and chemical properties during torrefaction. The energy and mass yield were also found to decrease with an increase in the torrefaction temperature, whereas the higher heating value increased.
94 citations
TL;DR: In this article, a multiscale model was developed in conjunction with Schlieren photography to measure laminar burning speeds and to investigate flame structures of H2/CO/air mixtures.
92 citations