ICOLES 2019, İstanbul, Türkiye, 27 - 29 Haziran 2019, ss.109-110
Biomass is a one of the important source of renewable energy with its increasing amount in the last years. Biomass resources can be utilized by producing biogas in the biogas stations which include process equipments operating in critical conditions. These biogas production plants are known to be responsible for a significant number of accidents (Scheroeder et. al. 2014). Therefore, the role of safety regulations should be revised and improved if there is a need according to the statistical investigation of accidents, consequence modeling and analysis of explosions (Kotek et. al. 2014). Methane and carbondioxide are the main components of biogas and they are intensely hazardous component due to their flammable and/or explosive properties. In this study, a consequence analysis of a methane gas explosion carried out to estimate the risks and potential hazards in toxic threat zone of a biogas station. ALOHA Software (Areal Locations of Hazardous Atmospheres, U.S. Protection Agency), MATLAB (Mathworks, 2011) and PHAST (Process, Hazard, Analysis, Software, Tool) are used to realize an explosion by modeling scenarios and thus to estimate the effects of an explosion just to get an insight on methane gas explosion. A threat zone estimation was done by using models of a tank, gas pipeline or direct explosion by ALOHA. Additionally, to calculate the energy of explosion three different methods were tried via MATLAB; i. TNT-equivalent method, ii. Multi-energy method, iii. Baker-Strehlow-Tang method. Then, overpressure vs. distance graphs were obtained to estimate damage potential which may lead to fatalities. These two different approaches are chosen to shed light on methane gas explosion risks and damages. Consequently, according to the results of threat zone analysis, toxic area and flammable area of vapor cloud with toxic levels of concern and blast area of vapor cloud explosion were estimated. Additionally, the overpressures and radiation intensity at threat zone were also calculated as a preliminary work for improving emergency plans in biogass stations in further studies.
Keywords: Consequence analysis, explosion, methane, biogas station