Safety Performance Analysis Of Instrument And Control System For Liquid Phase Hydrogenation Unit

In recent years,the construction of petrochemical production plant is rapid in China,ten-million-ton refinery planning and construction frequently,the three major petroleum companies often adopt advanced and mature technology in the process of plant construction,the equipment level is relatively high and the safety interlocking circuit is relatively perfect.But the safety accident occasionally produces.Due to limited investment and short-term return rate,local private refineries often invest less in equipment grade selection and safety system setting,resulting in frequent production safety accidents,The production safety situation of petrochemical industry is very severe.Grasp the key link of petrochemical plant safety and take an effective and instructive method to standardize the design of new unit and rectify the in-service unit is urgent.Combined with relevant experience and real cases at home and abroad,use the HAZOP analysis and SIL level evaluation to analyze and rectify the safety performance of the device achieve remarkable results,it is a targeted and worth popularizing method.According to the document no.116 of 2014 issued by the state administration of safety and regulation,the guidance of the state administration of safety and regulation on strengthening the management of chemical safety instrumentation system,the safety instrumentation system evaluation and rectification were carried out for the 3.75 million tons/year diesel liquid hydrogenation unit of sinochem petrochemical co.,ltd.which is under construction.Comb the whole process of HAZOP analysis and SIL level evaluation,analyzes the technological process of device,the selection principle of instrument and control system.The key nodes of the device are illustrated with examples,HAZOP analysis and SIL level evaluation were performed on some nodes,through the analysis put forward many suggestions for the improvement of plant safety integrity,implement these suggestions into the subsequent design of the device.Through the actual operation of 3.75 million tons/year diesel liquid phase hydrogenation unit,the design method of improving the safety of safety instrument system with universal adaptability is summarized.Through the research of this subject,it is fully demonstrated that HAZOP analysis and SIL level evaluation of petrochemical plant and modification according to the rectification opinions can greatly improve the safety performance of the plant.According to the analysis and rectification,the 3.75 million tons/year diesel liquid phase hydrogenation unit of sinochem was successfully put into production in 2015,and it has been running safely and steadily for five years.Both liquid phase hydrogenation unit and gas phase hydrogenation unit,in addition to the reaction part of the process is the difference between,the rest are common in many places.In the basic design stage,we can apply the experience summarized in this topic to the optimization of safety instrument system of new device,so as to improve the accuracy of unit engineering cost,let owner master the total investment more accurately,reasonable allocate funds to purchase the key equipment,in addition,in the HAZOP-SIL analysis phase will be more smoothly.