Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 205 for “"char"”.
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Char Reaction Kinetics in a Transport Gasifier
… this type of technology, in particular the char reactions of a transport coal gasifier that utilizes the M. W. Kellogg process. It has been very difficult to develop an accurate model for this process due to the lack of kinetic/equilibrium data of the coal char re-bum reaction and its …
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Theoretical exploration of char formation during lignin pyrolysis
In this thesis, we explore the formation of char during lignin pyrolysis. This is accomplished using computational chemistry to study the energetics and mechanisms of reactions involved in lignin char formation.<br/> <br/>In Chapter 1, the background for the project is given, highlighting the …
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Gasification and combustion modeling for porous char particles
Gasification and combustion of porous char particles occurs in many industrial applications. Reactor-scale outputs of importance depend critically on processes that occur at the particle-scale. Because char particles often possess a wide range of pore sizes and react under varying operating …
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Numerical modeling of chemical recovery from black liquor char
A complete CFD model for the char burning stage of chemical recovery from black liquor is presented. Chemical recovery from black liquor is characterized by the occurrence of multiple, simultaneous reactions occurring in dynamic flow conditions. Rate equations for the different chemical reactions …
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Utilization of Char from Biomass Gasification in Catalytic Applications
… CO and H2; however by-products such as tar and char are formed. The tars must be decomposed or removed, as they can cause clogging in downstream equipment. Tars are most commonly decomposed catalytically or thermally. However, thermal decomposition requires high temperatures, and catalyst …
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Activation energy of Douglas fir char gasification by carbon dioxide
The activation energy of Douglas fir wood char gasified in carbon dioxide was determined. Activation energies were found for chars that had been pyrolyzed in nitrogen at 600, 750, and 900°C. A thermogravimetric analyzer provided the weight versus temperature data used to obtain the activation …
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High temperature gasification of coal char in carbon dioxide and steam
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1979.
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Arctic Char Otolith Records of Recent Limnological Change in High Arctic Lakes
… residing in these environments such as Arctic Char (Salvelinus alpinus) which represent the top predatory fish in Arctic lakes. Otoliths, the inner ear bones of fish, offer a method to monitor these impacts through chemical analysis of their annual rings. However, not only are long-term …
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FUEL NITROGEN CONVERSION DURING FUEL RICH COMBUSTION OF PULVERIZED COAL AND CHAR
The conversion of coal and char nitrogen has been investigated during fuel rich combustion. The experiments were done with the objective of clarifying the roles of NO, HCN, and NH₃, and char nitrogen in the post-combustion gases in the first, fuel rich stage of a staged combustor. The experimental …
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Modeling of single char combustion, including CO oxidation in its boundary layer
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1994.
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Gasification of coal char in oxygen and carbon dioxide at high temperatures.
Thesis. 1977. M.S.--Massachusetts Institute of Technology. Dept. of Chemical Engineering.
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Proof of concept and feasibility assessment of manufacturing a portable bio-char reactor
1 PDF file (viii, 43 pages)
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Between Uncertainty and Hope: Disaster, Displacement, and Livelihoods on Onishchit Char in Bangladesh
… the sites include a temporary river island (char), an embankment populated with islanders in Gaibandha district, and a shantytown and two rickshaw garages in Dhaka. An important aspect of this study has been to examine how disaster-induced vulnerabilities are linked with social structures. …
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Effects of Pressure on Coal Pyrolysis at High Heating Rates and Char Combustion
… The effect of pressure on coal pyrolysis and char combustion has been extensively studied but still remains to be further explored. The objective of this project was to characterize high pressure, high heating rate coal pyrolysis and char combustion, with emphasis on improving coal/char high …
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Fundamental Studies of Chemical Looping Combustion with Oxygen Uncoupling (CLOU) of Biomass Char
… Dissertation concerns the combustion of biomass chars in a fluidised bed using Chemical Looping Combustion with Oxygen Uncoupling (CLOU), a variant of CLC in which the oxygen carriers can release gaseous oxygen. In CLOU, the gaseous O₂ released from the oxygen carriers reacts heterogeneously with …
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Modeling of Activated Carbon and Coal Gasification Char Adsorbents in Single-Solute and Bisolute Systems
… Four activated carbons and a coal gasification char were the adsorbents studied. Several single-solute and bisolute column experiments were conducted to provide data for model verification; the model predicted not only adsorption, but also desorption that resulted from a step change in influent …
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