Study On The FCCU Risk Assessment Of Sinopec Xi'an Branch

Fluid catalytic cracking (FCC) is one of the most important processes converting heavy oil to light oils. The character of FCC determines that the process and equipment will face many risks. A safely and smoothly running of the fluid catalytic cracking unit (FCCU) becomes the focus of safety management in the enterprise.Taken FCCU of Sinopec Xian branch as research object in this paper, the basic processing technology and its principles of FCC was introduced, the hazardous sources were distinguished. According to the process of FCC, the FCCU was divided into reactor-regeneration system, fractionation system and absorption-stabilization system. Then it used the Failure Mode and Effects Analysis method (FMEA) to analyze those three systems. The main failure modes and effects of each system were found out, the conclusions and suggestions were also given.Divided FCCU into the reaction-regeneration, fractionation, absorption- stabilization, desulfurization -sweetening and CO combustor. Then the fire risk of each system was assessed with DOW chemical fire and explosion indexes. The fire risk grade and accidental severity of every process section was determined.Considering the faults of conventional AHP-Fuzzy Comprehensive Evaluation, the Fuzzy Evaluation Method Based on Entropy optimal Theory was introduced to safety evaluation. Through analyzing venture influential factors of FCCU, a systematic index system of venture evaluation was established. Then using Fuzzy Evaluation Method Based on Entropy optimal Theory to quantitative analyze the interior and exterior venture factors of FCCU. The results show that the potentially hazardous of reactor- regeneration system was highest, the sequence of the potentially hazardous of the othe four systerm was: absorption-stabilization, CO combustor, fractionation, desulfurization-sweetening. The major factors for equipment failure are coking and corrosion of metals, it should pay attention in the production process.