摘要
中国石油化工股份有限公司洛阳分公司第Ⅱ套催化裂化装置的气控下流式外取热器在运行周期末期出现流化环穿孔磨损现象,该阶段产汽量难以维持正常负荷。根据流化环开裂情况,分析了流化环开裂后流化风的压力对外取热器流化的影响,得出了最佳风况点随设备发生变化而产生偏移的结论,结合具体的生产实例提出流化环开裂后维持设备继续运行的操作方法：大幅度降低正常流化风的压力并加大流化风用量,从而减小缺口对流化的不利影响,使流化环在出现缺口后仍能维持流化。对于该装置的气控下流式外取热器来说,现阶段最佳的工况点：流化风的压力为0.320~0.350MPa,流化风量应维持至少40m3/min（以标准状态计）,才能使筒体内的流化风分布均匀,消除和减小流化风走短路的影响,在设备发生异常时可维持60%左右的负荷,以免流化环彻底失效。
The wearing and rupture occurred in the fluidization air ring of external catalyst cooler of FCC unit in SINOPEC Luoyang Company at the end of operation cycle, which has made it difficult to maintain the required steam production. The impact of pressure of fluidization air after cracking of fluidizing air ring is ana- lyzed. It is concluded that the optimal air condition is moving with the variation of equipment conditions. The methods for maintaining the good operation after cracking of fluidizing air ring are presented through operation case study, such as greatly reducing the pressure of fluidization air and increasing the fluidization air flowrate so as to minimize the negative impact of cracking and maintain a normal fluidization after cracking. For the pneumatically controlled catalyst cooler of the unit, the optimum operating conditions are at present time are 0. 320 - 0. 350 MPa fluidization air pressure, 40 m3/min minimum fluidization air flowrate, which can main- tain the uniform fluidization air distribution inside the cylinder shell and eliminate or minimize the impact of short-cut of fluidization air. About 60% load can be maintained in abnormal operation of equipment to avoid the complete failure of fluidization air ring.
出处
《炼油技术与工程》
CAS
2015年第9期42-44,共3页
Petroleum Refinery Engineering
关键词
催化裂化装置
气控下流式外取热器
流化环
流化风
开裂
FCCU, pneumatically controlled catalyst cooler, fluidizing ring, fluidization air, cracking
