芳烃抽提装置换热器长周期运行分析OA

In a petrochemical plant,the heat exchangers of the aromatics extraction unit,which uses the C6～C7 in reformated depentanized oil as feedstock,frequently experienced problems such as tube bundle leakage and fouling during operation,preventing long-cycle operation.To ensure the long-cycle operation of the heat exchangers in the aromatics extraction unit,an analysis of the causes is conducted.It is found that the long-cycle operation of the heat exchangers is affected by the chloride ions and bromine index in the feedstock,oxygen and water content in the system,solvent high-temperature decomposition,tube bundle vibration and other factors.In response to the above influencing factors,measures are formulated,including adding dechlorination and olefin removal facilities,optimizing system water make-up and purging,controlling water balance and content,strengthening solvent regeneration tower sludge discharge,setting up solvent regeneration facilities,upgrading heat exchanger materials,optimizing heat exchanger structure and selection,adding anti-vibration rods,optimizing support plate settings,and reasonably setting the fixing method of internal heat exchangers.Through the continuous optimization and improvement of process control measures and equipment materials and structures,the heat exchanger of the aromatics extraction unit have currently operated continuously for 4 years without tube bundle leakage or structural issues.The long-cycle operation of the aromatics extraction unit heat exchange can be achieved through comprehensive management by optimizing process operating conditions and equipment materials and structures to ensure their long-cycle operation.