连续重整再生器约翰逊内网破损原因分析及处理

介绍了中国石油化工股份有限公司天津分公司炼油部1.0 Mt/a连续重整装置催化剂再生单元再生器约翰逊内网破损的现象和处理经过。分析认为,热应力和金属疲劳是造成约翰逊内网断裂和破损的直接原因,而较高的烧炭温度造成贴壁催化剂局部"超温"是导致内网表面出现微熔缺陷的主要原因。结合装置的现状提出了适当降低再生烧炭气氧含量,使再生器烧炭区峰值温度由第4点逐渐移至第5点,增大再生器的烧炭区域;控制重整反应氢油摩尔比不低于2.5,同时适当降低第四反应器操作温度;控制重整进料干点不大于170℃等预防措施。有效减少催化剂积炭,从而降低再生器烧炭区峰值温度。

Reason analysis and treatment of the Johnson inner screen disruption in continuous catalytic reforming regenerator

The disruption of Johnson inner screen in continuous catalytic reforming regenerator of the 1.0 MM TPY reforming unit of Tianjin Branch of SINOPEC Tianjin Petrochemical Company and treatment are introduced. The anylysis shows that thermal stress and metal fatigue are the direct causes of fracture and disruption of Johnson inner screen, while the local overtemperature of the adhering catalyst caused by higher coke burning temperature is the main cause of micro-melting on the surface of Johnson inner screen. Considering the present situation of the unit, effective reduction of catalyst coke deposition and peak temperature of coke-burning zone in regenerator can be realized by reducing oxygen content of coke-burning gas properly, enlarging coke-burning zone of the regenerator, controlling the ratio of hydrogen to oil of reforming reaction not less than 2.5, reducing the operating temperature of the 4 th reactor and controlling the dry point of reforming feedstock below 170 ℃.