Study On The Quantitative Risk Evaluation Method For Hydrocracking Reactors

In petroleum refining industries, the hydrogenation technology is widely used in hydro-sulfuring, hydro-fining and hydro-cracking technology. Hydrocracking reactors are core facilities in hydrogenation technology, and they are subjected simultaneously to the action of hydrogen and high pressure and temperature. For assuring safe operation, it is extremely important to evaluate their risk.The topic of this dissertation is "study on the quantitative risk evaluation method for hydrocracking reactors ". Through quantitative evaluation, the risk level of hydrocracking reactors is obtained. The main contents and conclusions are as follows:(1) The likelihood of failure and the consequence of failure analysis for hydrocracking reactors are carried out, and the analysis results show that the reactors are belong to medium-high risk equipments, and measures should be taken to reduce the risk.(2) The whole risk level of reactors is analyzed, and the likelihood of failure and the consequence of failure are given out by the OBRIT-Onshore software, which is convenient for enterprise to manage the risk of equipment.(3) By studying the relationship between the minimum pressurizing temperature (MPT) and the damage factor of temper embrittlement, the MPT of reactor is determined. The MPT of determination is near to the one of adoption in process. It provides technology guidance for production.(4) Through establishing and analyzing the fuzzy FTA of hydrocracking reactors, the main influence factors, such as recycle hydrogen, over-temperature, over-pressure are found out. Therefore in practical operation, it is as far as possible to avoid over-temperature, and over-pressure phenomenon.(5) The risk evaluation software for reactors is developed, and its characteristic, application, function, construction and flow chart are explained. And it provides a convenient calculation tool for future risk evaluation.