SNG FROM COAL: THERMODYNAMIC AND KINETIC CONSTRAINTS; USE OF NUCLEAR ENERGY.
Item
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Title
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SNG FROM COAL: THERMODYNAMIC AND KINETIC CONSTRAINTS; USE OF NUCLEAR ENERGY.
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Identifier
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AAI8312373
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identifier
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8312373
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Creator
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SHAPIRA, DAN.
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Contributor
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Prof. Reuel Shinnar
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Date
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1983
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Chemical
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Abstract
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Part I contains an analysis of the thermodynamic constraints of converting coal to SNG. It is shown that the thermodynamic constraints that limit the thermal efficiency are not inherent, but are the result of design decisions, based on available technology, as well as on the kinetic properties of available catalysts. The latter, limits the yield of methane to that obtainable at global equilibrium over carbon in the presence of CO, H(,2), CO(,2) and H(,2)O. The equilibrium composition is shown to be independent of the thermodynamic properties of the char or coal fed. These limitations give the nonisothermal two-stage processes significant thermodynamic advantages. The analysis in part I results in suggesting directions for modifying present processes in order to obtain higher thermal efficiencies. It also presents two-stage process schemes which may have significant advantages over present technology. As the methodology used for the thermodynamic analysis contains some novel elements, it should be of interest to the reaction engineer in general, and should be applicable to a wide range of catalytic and noncatalytic processes.;Part II focuses on the use of nuclear energy in the production of synthetic fuel. Two processes for the production of hydrogen (which is used in coal-to-SNG processes) are analyzed and compared. The two processes are: (1) Hydrogen from electrolysis of water using nuclear heat. (2) Hydrogen from steam reforming of methane using nuclear heat.;The method used is differential economic analysis which focuses on evaluating the inherent advantages and disadvantages of the proposed technologies. The method tries to quantify directly any potential advantage over existing technology. The method is especially suitable for evaluating new technologies at a stage where much of the detailed process information is still missing.;Part II shows that the use of high temperature heat in production of hydrogen from coal is less attractive than the use of the same heat to generate electricity and split water into H(,2) and O(,2). It is under the most optimistic assumptions, slightly more expensive per unit of coal saved, and has less potential for saving coal.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Engineering
