摘要
丙烯氨氧化法生产丙烯腈装置中,反应气体冷却器由于反应生成的高温反应气体中含有丙烯腈、氢氰酸、丙烯醛等易聚合的化合物,在反应气体冷却过程中容易发生聚合反应,生成的聚合物与流化床反应器带出的催化剂粉尘黏附并聚积在反应气体冷却器列管中,从而使冷却器管道阻力增加,反应系统操作压力明显升高,恶化流化床反应系统的操作状况,降低催化剂的反应性能,使装置消耗增加,运行周期缩短,影响装置的正常运行。通过试验及工业实践证明在反应气体冷却器管程入口处采用固体颗粒、以中压氮气为动力进行在线吹扫可以及时在线清除列管内壁黏附的聚合物和催化剂粉尘,实现在线清堵,延长装置的运行周期,维持装置较低的消耗水平。
In the process of propylene ＋ ammonia oxidation to acrylonitrile （AN）, the high temperature reactants contain AN, HCN, acrolein, etc, which tends to polymerization easily. As those reactants enter into reactor effluent cooler, the polymerization easily occurs. The polymer mixing with catalyst dust entrained from fluidized reaction bed cumulates in the tubes of reactant gas cooler, which leads to resistance increase inside the piping of cooler and significant increase in operation pressure of reaction system, thus the operation condition of fluidized bed reaction system is deteriorated, catalyst performance is degraded, overall consumption of AN plant is increased, and operation period is shorten. All the results cause negative impact on the plant normal operation. It is proven by experiment and industrial practice that adopting solid particle driven by medium-pressure N2 at inlet path of cooler for on-line blowing can timely remove the mixture of polymer and catalyst dust adhere to inner wall of cooler tube and achieve on-line plugging removal and longer plant operation period and lower overall consumption level of AN plant.
出处
《化学工程》
CAS
CSCD
北大核心
2013年第12期51-53,共3页
Chemical Engineering(China)
关键词
丙烯腈
反应气体冷却器
在线清堵
acrylonitrile
reactor effluent cooler
on-line cleaning
