Several methods proposed for calculating the value of the superheat limit temperature were analysed. The results obtained indicate that the procedures based on the thermodynamic stability approach introduce a significant uncertainty into the final values, depending on which equation of state is used. We propose a new approach based on the energy balance in the initial liquid mass just before the explosion. The temperature obtained using this method, Tsl-E, corresponds to the situation in which the energy transferred adiabatically between the cooling liquid and the vaporising liquid fractions is at its maximum. This leads to a minimum content of energy in the remaining liquid. Although these two approaches are equivalent-the procedures based on the thermodynamic stability approach use also the minimum energy state as a criterion-the new proposed method only uses the properties of the substance to obtain Tsl-E. Thus, Tsl-E represents the behaviour of each substance as a function of its molecular structure, while this influence is lost if a simple equation of state is used. Finally, some considerations are made on the limitations of the superheat limit temperature as a criterion for establishing whether an explosion is or is not a BLEVE.

BLEVE: a New Approach to the Superheat Limit Temperature / SALLA J., M; Demichela, Micaela; Casal, J.. - In: JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES. - ISSN 0950-4230. - 19:(2006), pp. 690-700. [10.1016/j.jlp.2006.04.004]

BLEVE: a New Approach to the Superheat Limit Temperature

DEMICHELA, Micaela;
2006

Abstract

Several methods proposed for calculating the value of the superheat limit temperature were analysed. The results obtained indicate that the procedures based on the thermodynamic stability approach introduce a significant uncertainty into the final values, depending on which equation of state is used. We propose a new approach based on the energy balance in the initial liquid mass just before the explosion. The temperature obtained using this method, Tsl-E, corresponds to the situation in which the energy transferred adiabatically between the cooling liquid and the vaporising liquid fractions is at its maximum. This leads to a minimum content of energy in the remaining liquid. Although these two approaches are equivalent-the procedures based on the thermodynamic stability approach use also the minimum energy state as a criterion-the new proposed method only uses the properties of the substance to obtain Tsl-E. Thus, Tsl-E represents the behaviour of each substance as a function of its molecular structure, while this influence is lost if a simple equation of state is used. Finally, some considerations are made on the limitations of the superheat limit temperature as a criterion for establishing whether an explosion is or is not a BLEVE.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/1544235
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