Vent sizing: Analysis of the blowdown of a hybrid non tempered system

JOURNAL OF HAZARDOUS MATERIALS

卷:191

Article

Vechot, Luc¹  Minko, Wilfried¹  Bigot, Jean-Pierre¹  Kazmierczak, Marc²  Vicot, Patricia² 

[1] Ecole Natl Super Mines, F-42023 St Etienne 2, France

[2] INERIS, F-60550 Verneuil En Halatte, France

关键词: Safety vent sizing;    Run-away;    Blowdown;    Non tempered system;    Cumene hydroperoxide;   

DOI  :  10.1016/j.jhazmat.2011.03.100

来源: Elsevier

【 摘 要 】

The runaway and blowdown of a non tempered hybrid chemical system (30% cumene hydroperoxide) exposed to an external heat input was investigated using a 0.11 scale tool. The maximum temperature and the maximum temperature rise rate were showed to be sensitive to the vent size. An Antoine type correlation between the maximum temperatures and pressures was observed. These resulted from the presence of vapour, mainly generated by the reaction products. Increasing the initial filling ratio resulted in an earlier vent opening but did not have a significant influence on the blowdown. Three types of mass venting behaviour were observed, when changing the vent area to volume ratio (A/V): for large A/V, two-phase venting occurred from the vent opening until the end of the second pressure peak; for medium A/V, two-phase venting occurred before and after the turnaround. The data seem to indicate that gas only venting occurred at turn-around; for low A/V, two-phase venting was observed only after the second pressure peak. Two-phase venting after the second pressure peak probably results from the boiling of the hot reaction products at low pressure. (C) 2011 Elsevier B.V. All rights reserved.

【 授权许可】

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