乙烯装置裂解气压缩系统长周期运行存在的问题  

Impacts of Cracking Gas Compression System on Long Period Operation in Ethylene Plant

作　　者：朱俊桦 曾淼洋 邵杰锋 张恒珍[1] Zhu Junhua;Zeng Miaoyang;Shao Jiefeng;Zhang Hengzhen(Sinopec Maoming Company,Maoming Guangdong 52500,China)

机构地区：[1]中国石化茂名分公司,广东茂名525000

出　　处：《石油石化绿色低碳》2018年第4期36-42,69,共8页Green Petroleum & Petrochemicals

摘　　要：茂名1号裂解装置裂解气压缩机在2011—2016年长周期运行中,出现了一段吸入压力和N因子增长、段间冷却器和排出管线结垢、碱洗塔堵塞、干燥器分子筛吸附性能下降等问题。通过优化压缩机洗油和阻聚剂注入量,做到了预防结垢和在线除垢同时进行,有效预防N因子增长。针对裂解气压缩机三段和四段换热器压差上涨,切换备用换热器定期清焦,有效降低了段间阻力降对压缩机功率的影响。针对碱洗塔塔盘堵塞,注入黄油抑制剂,加注冲洗油频率,投锅炉给水冲洗波动等方法,有效抑制了黄油的生成。分子筛粉化导致后系统出现冻堵,优化操作调整运行周期,解决了水分穿透问题。以上措施确保了乙烯装置长周期稳定运行。In Maoming Company＇s No. 1 ethylene cracker, some problems had been exposed in the cracking gas compressor during the long period operation from 2011 to 2016, such as the increased first-stage suction pressure and N Factor, the polymer fouling in outlet pipes and inter-stage coolers, the clogging in caustic scrubbing tower and the decreased absorbability of molecular sieve in dryers. By optimizing injection of polymerization inhibitor and wash oil, prevention and on-line removal of fouling are achieved synchronously to avoid increase in N Factor. As for the rise of differential pressure between the third-stage and forth-stage, switching to standby heat exchanger con minimize the impact of inter-stage differential pressure on the power of compressor. By means of injecting of grease inhibitor, changing the rate of adding wash oil and using boiler feed water to flush, the formation of grease can be inhibited effectively. Pulverization of molecular sieve, which may lead to downstream freeze plugging due to leak of moisture, can be prevented by improving operation and adjusting running period to stop water penetration. All these measures can guarantee a long and stable operation of ethylene plant.

关 键 词：裂解气压缩机 一段吸入压力 N因子 段间冷却器 碱洗塔 干燥器 

分 类 号：TQ051.21[化学工程] TQ221.211