Risk assessment of an oxygen-enhanced combustor using a structural model based on the FMEA and fuzzy fault tree |
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| Institution: | 1. Institute of Mechanics, Chinese Academy of Sciences, 100190 Beijing, China;2. School of Environmental Science and Engineering, Tianjin University, 300072 Tianjin, China;3. East China Electric Power Institute of China Power Engineering Consults Group, 200063 Shanghai, China;1. Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 121-742, Korea;2. Department of Chemistry, Pukyong National University, Busan 608-737, Korea;1. Chemical, Biological and Pharmaceutical Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA;2. School of Civil and Environmental Engineering, Singapore Membrane Technology Center, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore 639798, Singapore;3. Ralph E. Martin Department of Chemical Engineering, University of Arkansas, Fayetteville, AR 72701-1201, USA |
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| Abstract: | The oxygen-enhanced combustor has the advantages of high burning efficiency and low emissions. However, it should not be promoted for industrial use until its reliability and safety have been fully recognized. A new methodology is proposed to assess the risk of an oxygen-enhanced combustor using a structural model based on the FMEA and fuzzy fault tree. In addition, it is applied to a selected pilot semi-industrial combustor. To identify the hazard source comprehensively, the pilot is divided into four subsystems: the combustor subsystem, feed subsystem, ignition subsystem and exhaust subsystem. According to the operational parameters of flow (flow rate, temperature and pressure) and the component functions in different subsystems, the cause and effect matrix can be built using the structural model, and the relationship between the operational parameters and the effects of the change for the operational parameters on the system can be presented. Based on the results of cause and effect matrix, the FMEA can be built to describe the failed models and accident scenarios of the pilot. The main accident forms include leakage, injury, fire and explosion. Accordingly, with the severity and probability analysis of different accident forms, the fire and explosion accidents should be further accessed quantitatively using the fuzzy fault tree analysis. The fault trees can be obtained in accordance with the FMEA, and the qualitative assessments of the basic events can be collected by using expert scoring. A hybrid approach for the fuzzy set theory and weight analysis is investigated to quantify the occurrence probability of basic events. Then, the importance analysis of the fault trees, including the hazard importance of basic events and the cut set importance, is performed to help determine the weak links of the fire and explosion trees. Finally, some of the most effective measures are presented to improve the reliability and safety of the combustion system. |
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| Keywords: | Risk assessment Semi-industrial combustor Structural model FMEA Fuzzy fault tree |
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