암모니아 탱크 안전밸브 및 흡수시설에 관한 연구

Abstract

Chemical plants have been continuously changed according to the purpose of reducing costs and improving production capacity after initial operation. At this time, even though changes are implemented through design reviews such as process safety and work safety, it is questionable whether the chemical plant has been changed to meet the current standards about 50 years after settling in Korea. In this study, ammonia tanks of A plant in Ulsan Petrochemical Industrial Complex were selected and studied. The ammonia tank of cylindrical type was installed outdoors to store propylene during the first plant construction in 1972. Due to the increase in production capacity, a separate propylene storage tank has been installed, and the cylindrical type propylene tank is currently operated as an ammonia tank. Despite the changing use of the tank, no review data were found at the time of the change. Therefore, it shall be confirmed that it is properly modified and operated safely by the current standard, and shall propose improvements. In addition, the study was conducted with the purpose of the preparation of emergency response plans through the chmical diffusion modeling by CA(Consequence Analysis). The study analyzed the design data at the time of initial installation, and confirmed the safety by applying the KOSHA Guide. It not only identified the processing capability of ammonia absorbing systems at the discharge of the safety valve but also determined the scope of its impact to the outside using EPA's ALOHA(Areal Locations of Hazardous Atmospheres) and KORA(Korea Off-site Risk Assessment Tool) programs. As a result, it was confirmed that there was no problem with the safety devices installed in the ammonia tank, and it was possible to suggest the time necessary for emergency response in case of ammonia release.