Material Damage Analysis And Quantitative RBI Study Of Heating Furnace Tubes

Hydrogenation reheating furnace is the key equipment in petrochemical production.The furnace tube is the key component of the heating furnace,and its reliability and service life directly affect the production safety of the whole units.Taking TP347H furnace tubes of heating furnace as the research object,and based on the analysis of the failure mode of heating furnace,this paper studys the damage analysis experiment and quantitative RBI research of furnace tubes.Firstly,based on the working principle and internal ’structure of the heating furnace,the failure mode and failure analysis consequence of the heating furnace are carried out.The results show that the furnace tubes are the most serious areas in the heating furnace system,and the TP347H furnace tubes which is the outlet line of the F301 heating furnace radiating section have high hardness and microstructure degradation in maintenance records,so they are the most serious areas in failure analysis consequence.Secondly,based on the failure mode of the heating furnace tube,the experimental study on the damage of the furnace tube is carried out.Although the chemical composition and mechanical properties of the TP347H furnace tube after service are in conformity with the standard,its microstructure contains obvious precipitates,and the tensile fracture shows brittle fracture characteristics.Its hardness is high,and impact energy is lower nearly 100%than that of new furnace tube.The results show that the TP347H furnace tube after service has serious microstructure degradation and material embrittlement.Thus it can not be used in service,and needs to be replaced.Finally,based on the quantitative RBI method,the quantitative RBI study of the furnace tubes was carried out.The results show that the maximum stress value of the heating furnace tube is 155 MPa,and it exceeds the range of safety permissible stress of TP347H material;The failure probability level of the furnace tube is 1 grade,the result grade of failure is E grade,which leads to the furnace tube the middle and high risk level,and the risk should be reduced by immediate or recent measures.;and the specific inspection strategies for the inspection items of the furnace tube which includes the proportion of the sampling,the number of the root of the furnace tube and the method of inspection and selection are formulated.This paper carries out the damage experimental analysis and the quantitative RBI theory of the furnace tube of,establishs the failure possibility analysis model and failure consequence assessment model of petrochemical heating furnace tube.The research results of this paper have guiding significance for austenitic stainless steel material damage,and the analysis lay a theoretical foundation for engineering application in petrochemical heating furnace to expand quantitative RBI,and it has important theoretical significance and engineering application value.