摘要
某石化公司裂解装置运行过程中,乙烯精馏塔塔顶甲烷含量持续上涨,经排查为脱甲烷塔冷凝器甲烷氢侧泄漏所致,更换新的钢铝接头后,甲烷含量逐渐下降满足生产要求。对运行状况进行分析,对接头开裂处样品进行宏观检查、金相分析、硬度检测和扫描电镜观察,开裂主要原因是日常开停工期间冷凝器升降温速率控制不当、钢铝转换接头存在制造缺陷等。通过制定严格升降温速率操作方案,严格细化和优化工艺操作,优化相应设备的操作规程,达到装置长周期平稳运行的目标。
During the operation of the ethylene cracking unit of a refining and chemical plant,the methane content at the top of the ethylene distillation column continuously increased.The investigation and analysis showed that it was caused by the leakage on the methane-hydrogen side of the condenser in demethanizer.After replacing the steel-aluminum transition joint with a new one,the methane content gradually decreased,meeting the production requirements.Through the operational analysis and the macro inspection,metallographic analysis,hardness testing and scanning electron microscope observations of the failed samples,it was found that the main reasons for the cracks include the improper control of the cooling and heating rates of cold box system during daily start-up and shutdown and the manufacturing defects in the steel-aluminum transition joint.By formulating strict operating procedures for cooling and heating rates,strictly refining and optimizing process operations,and optimizing the operating procedures for relevant equipment,the goal of long-term stable operation of the unit can be achieved.
作者
邢普瑜
吕倩
袁帆
高飞
Xing Puyu;Lyu Qian;Yuan Fan;Gao Fei(China Petroleum Tarim Petrochemical Company,Korla,Xinjiang,P.C.841000;Northwest Sub-center of China National Petroleum Corporation Procurement Center,Xi'an,Shaanxi,P.C.710000)
出处
《乙烯工业》
2025年第4期15-19,I0001,共6页
Ethylene Industry
关键词
脱甲烷塔冷凝器
钢铝接头
爆炸焊
泄漏
原因分析
demethanizer condenser,steel-aluminum joint
explosion welding
leakage
cause analysis
