煤化工气化装置碳洗塔内壁复合层开裂分析  

Cracking Analysis of Inner Wall Composite Layer of Carbon Washing Tower in Coal Chemical Gasification Unit

作　　者：张乐兴 郑民君 文伟 闫登峰 郑宝军 杨静 陈茂林 Zhang Lexing;Zheng Minjun;Wen Wei;Yan Dengfeng;Zheng Baojun;Yang Jing;Chen Maolin(Mechanical Industry Shanghai Lanya Petrochemical Equipment Inspection Institute Co.Ltd.,Shanghai 201600,China;PetroChina Tarim Oilfield Company,Korla 841001,China)

机构地区：[1]机械工业上海蓝亚石化设备检测所有限公司,上海松江201600 [2]中国石油天然气股份有限公司塔里木油田分公司,新疆库尔勒841001

出　　处：《山东化工》2024年第6期208-211,共4页Shandong Chemical Industry

摘　　要：碳洗塔是煤化工气化装置的核心设备,对某煤制乙二醇气化装置碳洗塔内壁复合层进行检验,发现大面积点蚀坑,进行渗透检测,发现点蚀坑周围大面积裂纹,呈蜘蛛网状。通过对碳洗塔内壁复合层化学成分分析,金相组织分析,碳洗塔工作介质组分分析、水浴水质分析。确定水浴水质氯离子含量超标、弱酸性,在液面波动位置、积液不易流动位置,氯离子浓缩聚集,形成氯离子点蚀和氯化物应力腐蚀。根据检验结果,提出稳定操作,控制水浴氯离子含量、pH值,加大新鲜水补给量,内壁复合层进行材料升级,是控制碳洗塔内壁复合层开裂的有效手段,本次结果为同类、同工艺设备设计、运行提供依据。Carbon scrubber is the core equipment of coal chemical gasification unit.The inner wall composite layer of carbon scrubber in a coal-to-glycol gasification unit was tested,and a large area of pitting pits were found.Penetration testing was carried out,and a large area of cracks around the pitting pits were found,which were spider webs.Through the analysis of the chemical composition of the inner wall composite layer of the carbon washing tower,metallographic structure analysis,carbon washing tower working medium composition analysis,water bath water quality analysis.It is determined that the chloride ion content in the water bath water exceeds the standard and is weakly acidic.In the position of liquid level fluctuation and the position where the liquid is not easy to flow,the chloride ion is concentrated and aggregated to form chloride pitting and chloride stress corrosion.According to the test results,it is proposed that stable operation,control of chloride ion content and PH value of water bath,increase of fresh water supply,and material upgrading of inner wall composite layer are effective means to control the cracking of inner wall composite layer of carbon washing tower.The results provide a basis for the design and operation of similar process equipment.

关 键 词：碳洗塔 气化装置 开裂 氯离子点蚀 氯化物应力腐蚀开裂 

分 类 号：TQ223.162[化学工程—有机化工] TQ051.5