An integrated model for vent area design of hydrocarbon-air mixture explosion inside cubic enclosures with obstacles. (January 2019)

• Record Type: Journal Article
• Authors: Shi, Jihao; Li, Jingde; Hao, Hong; Zhu, Yuan; Chen, Guoming
• Is Part Of: Journal of loss prevention in the process industries. Volume 57(2019)
• Page Start: 61
• Page End: 72
• Publication Date: 2019-01
• Subjects: NFPA-68 2018 -- BS EN 14994:2007 -- Bayesian Regularization Artificial Neuron Network -- Integrated mathematical model -- Turbulence-inducing obstacle effect -- Vent area design; Chemical industries -- Safety measures -- Periodicals; 660.2804
• DOI: 10.1016/j.jlp.2018.11.009
• Languages: English
• ISSNs: 0950-4230

Abstract

Abstract: This study aims to develop an integrated model - NFPA-68-BRANN model, which can be used to calculate the vent areas of cubic enclosures with obstacles. Seven experiments regarding vented explosion inside the obstructed enclosure are reviewed and applied to check the accuracy of two existing standards, i.e. the NFPA-68 2018 and the BS EN 14994:2007. Accordingly, the parameters to describe the flame development in the NFPA-68 2018 are amended by adopting the Bauwens model. Bayesian Regularization Artificial Neuron Network (BRANN) model presenting the non-linear relationship between the turbulent flame enhancement factor X and its affecting factors is subsequently developed. Eventually, the NFPA-68-BRANN model is generated by incorporating the BRANN model into the modified NFAP-68 2018. The accuracy of the NFPA-68-BRANN model is validated by using a series of the New Baker Test data. Highlights: Seven experiments of vented hydrocarbon-air mixture explosion inside cubic obstructed enclosure are reviewed. The accuracies of two standards for vent size design are examined. Parameters regarding flame development in the NFPA-68 2018 version are amended. BRANN model presenting the relationship between X and its affecting factors is developed. NFPA-68-BRANN model is generated and validated.