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Second‐law efficiency analysis of a coal gasification process
Author(s) -
Rodriguez S. J. Luis,
Gaggioli Richard A.
Publication year - 1980
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450580314
Subject(s) - coal , process engineering , coal gasification , process analysis , process (computing) , unit (ring theory) , waste management , raw material , environmental science , efficient energy use , engineering , computer science , chemistry , mathematics , mathematics education , organic chemistry , operating system , electrical engineering
The present paper summarizes a comprehensive Second‐Law analysis of the SYNTHANE process of coal gasification (1) , based on the available‐energy concept as applied to design conditions and data. The analysis yields an overall process efficiency of 46%. For every 100 MJ of useful energy supplied with coal, 51 MJ are consumed during the various unit operations while effluents carry 3 MJ. Unit 30, Steam and Power Production, consumes nearly 20 MJ; Unit 15, Gasification, used up nearly 16 MJ; Units 12 and 14, Coal Preparation and Feeding, about 5 MJ; Units 16 and 17, Raw Gas Quenching and Shift Conversion, 4 MJ; Unit 32, Oxygen Plant, approximately 2 MJ; other miscellaneous units contribute a combined available‐energy destruction of 4 MJ. The Second‐Law analysis unveils the inefficiencies present in the process and their sources, thus pinpointing the opportunities for improvement in the SYNTHANE process.