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Cracking Analysis and Safty Evaluation of Hot-Wall Hydrogenation Reactors’s Nozzle’s Crack
Author: LiuChuanMing
Tutor: LinYuJuan
School: Daqing Petroleum Institute
Course: Mechanical Engineering
Keywords: hot-wall hydrogenation fracture of pressure vessel defect evaluation nozzle stress concentration crack safety evaluation of pressure vessel ANSYS
CLC: TE966
Type: Master's thesis
Year: 2005
Downloads: 255
Quote: 2
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Abstract
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Modern petroleum refining industry needs produce fine petroleum product or increase chemical raw material middle distillate High-sulfur crude oil poor oil’s high severity hydrotreating process was put into use and it needs improve environment In order to keep pace with the requirement hydrogenation unit has been invented Meanwhile, Hydrogenation unit’s key equipment-—hot-wall hydrogenation reactor’s design and manufacturing technology have rapidly improved Hot-wall hydrogenation reactor is necessarykey equipment of hydrotreating process It operates in high temperature (about 350℃) high pressure (about 18.2Mpa) and in the presence of high pressure hydrogen harsh conditions Fluctuation of temperature and pressure in the course of operation, and variation of temperature and pressure during start operation and shutdown will cause stress cycle fatigue, crack initiation and fatigue propagation of already existing defecto These will cause damage to hot-wall hydrogenation reactor in operation,, In the cause, Production factory and relative organization attach importance to safety operation of hot-wall hydrogenation reactor For this reason, It is very important for theory and practicality to analyze and evaluate high pressure vessel’s defect on basic of its performance The paper tries to study and analyze practical application on site on hot-wall hydrogenation reactor R3102 of Daqing petro-chemical company According to working characteristic of hydrogenation reactor, the paper tries to study kinds of dangerous operating mode of reactor in operation and then finds the best dangerous localization of reactor and calculate analyze, evaluate detect result by relative theory of vessel,,The paper finds out engineering real needs and basic data by practice and investigation , reviews and analyzes researches and achievements of hydrogenation reactor home and abroad; the paper studies some dangerous operating modes of reactor in operation and then gets the best dangerous (easy damage) localization of reactor and calculates and checks the location By calculation, reinforcement of nozzle conforms to requiremento According to structure and technology’s characteristic of hot-wall hydrogenation Reactor, formulate nondestructive testing scheme of it After nondestructive testing stopping hot-wall hydrogenation, there are cracks in the place of the top-bottom head and nozzle. Individual crack has elongated parent material The paper analyses the cause of cracks , evaluates safely the cracks and estimate the rate of cracks extending and calculate the residual life of hot-wall hydrogenation in the presence of the crackso The result shows that the part will be used 7.4 years safely, if it is unchanged It not only saves the production cost on site, but also provides practicable scientific foundation for directing safety production At the same time, considering manmade error, the paper model the nozzle of the top head in the light of the structure’s forced feature by use of ANSYS that has the capacity of accurate solution and strong analysiso Analyses distribution of stress and deformation and then accurately calculate the maximum of stress at the boundary of the head and nozzle The maximum is 177.7.5Mpa It revises the error of routinemethodo
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CLC: > Industrial Technology > Oil and gas industry > Oil machinery and equipment and automation > Oil and gas processing plant machinery and equipment > High pressure hydrogenation equipment, reactor and regenerator
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