Journal
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
Volume 90, Issue 4, Pages 311-316Publisher
ELSEVIER
DOI: 10.1016/j.psep.2011.09.009
Keywords
Explosion limits; Group contribution method; Inhibition efficiency; Inerting concentration; Maximum charge; HFC32
Categories
Funding
- Hi-tech Research and Development Program of China [2007AA05Z223]
- National Education Department for Doctor Center Foundation [200800560041]
- National Natural Science Foundation of China [51076112]
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HFC32 is a potential alternative refrigerant with excellent thermal performance, but the flammability is a main obstacle for its applications. The group contribution method is utilized to analyze the inhibition efficiency of nonflammable refrigerants in binary mixtures. Furthermore, a novel equation of predicting the minimum inerting concentration of nonflammable refrigerants has been proposed by analyzing the variation of the flame propagation velocity and the flammable refrigerant concentration. Experimental studies of the explosion limits of HFC125/HFC32, HFC227ea/HFC32 and HFC13I1/HFC32 were carried out and the ranges of explosion limits were obtained. At the same time, the relationship between the maximum charge of the flammable refrigerants and lower flammability limit (LFL) was analyzed. The result demonstrates that the proposed novel theoretical equation can effectively predict the minimum inerting concentration of nonflammable refrigerants to flammable refrigerants, and the theoretical results have significance on the security application of the binary mixtures. (C) 2011 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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