Read e-book online Clean Utilization of Coal: Coal Structure and Reactivity, PDF

By J. W. Larsen (auth.), Yuda Yürüm (eds.)

ISBN-10: 9048141583

ISBN-13: 9789048141586

ISBN-10: 9401710457

ISBN-13: 9789401710459

This quantity comprises the lectures awarded on the complicated learn Institute on "Chemistry and Chemical Engineering of Catalytic reliable gas Conversion for the construction of aean man made Fuels" which used to be held at Ak~;ay, Edremit, Tiirkiye, among July 21 and August three, 1991. The booklet comprises 23 chapters initially written for the assembly through extraordinary scientists an technologists within the box. l want to recognize the contribution of every of the authors within the booklet. Their efforts have make clear our realizing in coal technological know-how study and higher usage of coal. 3 major topics: constitution and reactivity of coal; cleansing of coal and its items, and components affecting environmental stability of power utilization and strategies for destiny, have been mentioned within the Institute and those are offered less than six teams within the ebook. i am hoping that of significant use to analyze employees from educational and commercial heritage. the e-book may be many of us contributed to the luck of the Institute on which this quantity was once established. I take this party to thank my colleagues who lectured within the Institute, either for his or her efforts in the course of the weeks and their expertly ready lecture notes that reached to me in time. The Institute was once generously backed by means of the medical and Environmental Affairs Dh·ision of the NATO and their contribution is deeply acknowledged.

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Additional resources for Clean Utilization of Coal: Coal Structure and Reactivity, Cleaning and Environmental Aspects

Example text

In a Gray-King furnace bituminous coals, rich in vitrinite, pyrolyse to yield about 70% of coke or char and about 10% of each of tar, liquor (water) and gas. It is clear that retrogressive reactions reduce the yield of tar and one realises that, in order to maximise the tar yield one requires a reactor in which liquid products are removed from the hot zone as rapidly as they are formed. This implies a. lme particles of coal- so that liquid products may escape readily and so that problems of heat transfer are minimised.

1 %C: % carbon w/w daf Maceral group analysis, %V, %L, %1 =% vol/vol dmmf vitrinite, liptinite, inertinite. Tl: Tar yield, %w/w daf coal; heated to 7000C at 1K/s V1: Total volatile yield, %w/w daf coal; heated to 7000C at 1K/s TlOOO: Tar yield, %w/w daf coal; heated to 7000C at 1000K/s V1000: Total volatile yield, %w/w daf coal; heated to 7000C at 1000K/s All pyrolyses were conducted in a flow of helium and the peak temperature of 7000C was always held for 30 seconds. ; 20 > 10 - «< 6 p r--*-+ v u I.

Extractive chemical disintegration at temperatures exceeding 4QOOC where the solvent becomes a reactant in the process. Berkowitz (2) has differentiated between various extraction regimes as: a. Extraction at or below the boiling point b. 500C at autogenic solvent pressures) c. Extraction near 4000C when thermal decomposition, solvolysis, and hydrogenation reactions are combined. Here solvolysis is defined as any coal-solvent interaction at "conditions that are more severe than conventional Soxhlet extraction, but do not simultaneously promote incipient 'active' thermal decomposition of the coal".

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Clean Utilization of Coal: Coal Structure and Reactivity, Cleaning and Environmental Aspects by J. W. Larsen (auth.), Yuda Yürüm (eds.)

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