外取热器连接管道衬里失效分析

Failure Analysis of Refractory Lining in Connection Pipelines of Catalyst Cooler

中国石油化工股份有限公司上海高桥分公司1.4 Mt/a重油催化裂化装置外取热器入口斜管衬里结构采用龟甲网双层隔热耐磨衬里,返回管衬里结构为侧拉环双层隔热耐磨衬里。在装置运行过程中经常会出现热点,甚至于管壁受损泄漏,损坏形式主要是衬里掏空、龟甲网变形、开裂和衬里脱落入口斜管与外取热器连接处龟甲网开裂以及入口斜管与再生器连接处衬里脱落。由于流速高,催化剂冲刷磨损严重,极为容易造成设备损坏,通过分析衬里失效的几方面原因,从外取热器结构、铆固钉排布衬里、施工质量、衬里结构设计等方面制定解决方案,使设备达到装置长周期运行的目的。

The lining of inlet line of catalyst cooler of the 1. 4 Mt/a heavy oil FCC unit in SINOPEC Shanghai Gaoqiao Petrochemical Company was hexagonal mesh double - layer refractor7 lining and the lining of return line was side ring refractol7 lining. In the operation of catalyst cooler, the line wall frequently suffered from hot spot and line leaked from damages. The damages are mainly lining evacuation and defol^lation of hexagonal mesh. The cracks are the cracks of hexagonal mesh at the connection of inlet line and catalyst cooler, and lining spalling is mainly the spalling of refl＇actory lining at the connection of inlet line and catalyst cooler. The high flow velocity and strong impingemenl erosion will easily damage the equipment. The causes of lining failure are analyzed, and solutions are developed in respect of catalyst cooler construction, anangement of anchor bohs, construction quality and lining structure for the long - term operation of the unit.