热红外温敏技术在RFCCU衬里运行维护的应用研究

发布时间：2018-07-09 14:12

本文选题：重油催化裂化 + 红外热成像　；参考：《东北石油大学》2017年硕士论文

【摘要】：随着重油催化裂化装置(RFCCU)加工原料的不断加重,装置运行的经济效益在炼油厂中逐渐占据主导地位,装置长周期运行已成为各炼油厂争相的追求目标,然而反应再生系统器壁的过热问题,内部衬里不同程度的冲刷磨蚀问题,导致了反应再生系统这一核心加工设备局部超温,运行期间甚至超过设计温度。装置运行时设备内部高温催化剂对碳钢金属器壁磨损严重,易导致器壁磨蚀穿孔,严重时将直接导致装置非计划停工。热红外温敏技术及其配套的热红外检测设备已经得到全面发展,红外检测热图的清晰度和准确率都得到大幅度提高,本文应用先进的红外热成像仪器对反应再生系统器壁超温部位进行全面的安全检测扫描,将红外扫描热图进行对比分析。查找到主要易超温部位:集中在90°或45°弯头位置,容器接管的下料位置,接管的相贯焊缝位置以及局部器壁的中间位置。本文对催化剂磨蚀90°弯头典型的衬里破坏形式进行仿真模拟,通过Solidworks建模、Gambit划分网格、ANSYS软件中的Fluent进行气固两相流的模拟、计算,得出典型弯管模型最易冲刷磨蚀的部位,为典型过热区域的冲刷磨蚀分析提供理论依据,为实际操作提供生产监测指导。本文从装置历次检修衬里的破坏形式入手,详细分析反应再生系统不同部位的衬里结构型式,分析出弯头部位块状过热区域与高速催化的冲刷磨损有关,接管接缝部位的带状过热区域主要是该部位衬里开裂破损所致,直管部位以及器壁中间位置的超温只要是由于内部衬里施工质量以及衬里料施工过程中受潮或者烘干升温不到位所致,小接管等狭小区域的过热是高速气流、涡流所致。经过对过热区域的检测和分析,详细制定容器器壁过热的治理措施:装置生产过程中进行在线贴板处理,解决容器外壁局部过热磨损问题;装置停工过程中有针对性的对衬里进行修复和更换,并严格制定衬里烘干曲线,全过程控制衬里的施工质量,全面保障重油催化裂化装置长周期平稳安全运行。
[Abstract]:With the aggravation of heavy oil catalytic cracking unit (RFCCU) processing feedstock, the economic benefit of unit operation has gradually occupied a dominant position in the refinery, and the long period operation of the unit has become the pursuit target of each refinery. However, the overheating of the reactor wall and the erosion and abrasion of the inner lining lead to the partial overheating of the core processing equipment of the reactor regeneration system, and even exceed the design temperature during operation. During the operation of the equipment, the high temperature catalyst inside the equipment will wear the carbon steel metal wall seriously, which will easily lead to the abrasion and perforation of the equipment wall, and will lead directly to the unplanned shutdown of the equipment. The thermal infrared temperature sensing technology and its matching thermal infrared detection equipment have been developed in an all-round way, and the clarity and accuracy of the infrared thermal images have been greatly improved. In this paper, the advanced infrared thermal imager is used to detect and scan the overheated parts of the wall of the reaction regeneration system, and the infrared scanning thermal images are compared and analyzed. The main overheated parts are found, such as the position of 90 掳or 45 掳bend, the position of the container nozzle, the position of the intersecting weld and the middle position of the local wall. This paper simulates the typical lining failure form of 90 掳bend of catalyst, simulates the gas-solid two-phase flow through Solidworks modeling and fluent in Gambit meshing ANSYS software, and obtains the most easily erosive erosion part of typical curved pipe model. It provides a theoretical basis for the analysis of scour erosion in a typical overheated area and provides a production monitoring guide for practical operation. In this paper, starting with the failure form of the overhauling lining of the plant, the structure types of the lining in different parts of the reaction regeneration system are analyzed in detail, and it is found that the block overheating area of the elbow part is related to the erosion and wear of the high speed catalysis. The band overheating area in the joint of the nozzle is mainly caused by the cracking and breakage of the lining in that part. As long as the overtemperature of the straight pipe and the middle position of the tube wall is caused by the internal lining construction quality and the damp or dry heating in the lining construction process, the overheating in the narrow area such as the small nozzle is caused by the high speed airflow and the eddy current. Through the detection and analysis of the overheating area, the measures to control the overheating of the vessel wall are worked out in detail: during the process of production, the on-line sticking plate is carried out to solve the problem of local overheating wear and tear of the outer wall of the vessel; During the shutdown of the plant, the lining is repaired and replaced, and the drying curve of the liner is strictly drawn up. The construction quality of the liner is controlled in the whole process, and the long period stable and safe operation of the heavy oil catalytic cracking unit is fully guaranteed.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE96

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