title: Fuzzy Bayesian Network-Bow-Tie Analysis of Gas Leakage during Biomass Gasification.
abstract: Biomass gasification technology has been rapidly developed recently. But fire and poisoning accidents caused by gas leakage restrict the development and promotion of biomass gasification. Therefore, probabilistic safety assessment (PSA) is necessary for biomass gasification system. Subsequently, Bayesian network-bow-tie (BN-bow-tie) analysis was proposed by mapping bow-tie analysis into Bayesian network (BN). Causes of gas leakage and the accidents triggered by gas leakage can be obtained by bow-tie analysis, and BN was used to confirm the critical nodes of accidents by introducing corresponding three importance measures. Meanwhile, certain occurrence probability of failure was needed in PSA. In view of the insufficient failure data of biomass gasification, the occurrence probability of failure which cannot be obtained from standard reliability data sources was confirmed by fuzzy methods based on expert judgment. An improved approach considered expert weighting to aggregate fuzzy numbers included triangular and trapezoidal numbers was proposed, and the occurrence probability of failure was obtained. Finally, safety measures were indicated based on the obtained critical nodes. The theoretical occurrence probabilities in one year of gas leakage and the accidents caused by it were reduced to 1/10.3 of the original values by these safety measures.
authors.affiliation: School of Resources and Civil engineering, Northeastern University, Shenyang, Liaoning, P. R. China.
authors.forename: Fang
authors.initials: F
authors.lastname: Yan
authors.affiliation: School of Resources and Civil engineering, Northeastern University, Shenyang, Liaoning, P. R. China.
authors.forename: Kaili
authors.initials: K
authors.lastname: Xu
authors.affiliation: School of Resources and Civil engineering, Northeastern University, Shenyang, Liaoning, P. R. China.
authors.forename: Xiwen
authors.initials: X
authors.lastname: Yao
authors.affiliation: School of Resources and Civil engineering, Northeastern University, Shenyang, Liaoning, P. R. China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Li
mesh_terms: D000465:Algorithms; D001499:Bayes Theorem; D018533:Biomass; D055884:Chemical Hazard Release / Q000517:prevention & control / Q000706:statistics & numerical data*; D017143:Fuzzy Logic; D005740:Gases / Q000009:adverse effects*; D059205:Renewable Energy
chemical_list: D005740:Gases