【作者】 刘华；

【导师】 李兆慈； 杨莉荣；

【作者基本信息】 中国石油大学(北京) ， 石油与天然气工程（专业学位）， 2023， 硕士

【摘要】 烯烃储罐试运投产过程中,极易出现丁二烯聚合胀管,乙烯储罐预冷收缩破裂等问题,研究合理有效的大型烯烃储罐试运投产方案至关重要。本文以东南亚某烯烃生产基地丁二烯、低温乙烯储存单元在试运投产过程为例,研究了罐体钝化、氮气置换、储罐预冷等的关键环节,形成了一套可行的烯烃物料试运投产技术方案。综合分析了目前常用的高压水枪法、满罐浸泡法和360°喷淋法烯烃储罐的清洗方案,选择360°喷淋法,通过试验研究进行了方案优化,并进行了现场应用。对比了两种丁二烯储存系统中氮气置换方案,选择单独置换并增加临时放空口,降低了氮气用量。研究了2×10~4m~3双金属全容罐预冷工艺,对常压液态乙烯用双金属全容罐投产试运进行了预冷模拟,结合生产实际,选取不同预冷速率进行比较,确定最优方案并进行了现场试验。研究结果表明,优化后的丁二烯系统化学清洗及钝化方案提升了工作效率,丁二烯系统4台子弹罐及工艺管网一次性进料成功,无故障间隔,无事故停输,相较于传统氮气置换方案,氮气用量减少约15%。更多还原

【Abstract】 During the commissioning of olefin storage tanks,problems such as butadiene polymerization expansion pipes and ethylene storage tank precooling shrinkage and rupture are very likely to occur,and it is important to study a reasonable and effective large-scale olefin storage tank commissioning and operation scheme.Taking butadiene and low-temperature ethylene storage unit in an olefin production base in Malaysia as an example,this paper studies the key links of tank passivation,nitrogen replacement,tank pre-cooling,etc.,and forms a feasible technical scheme for commissioning and operation of olefin materials.The cleaning schemes of olefin storage tanks commonly used in high-pressure water gun method,full tank immersion method and 360°spray method were comprehensively analyzed,and the 360°spray method was selected,and the scheme was optimized through experimental research and applied on site.The nitrogen replacement scheme in the two butadiene storage systems was compared,and the nitrogen consumption was reduced by choosing separate replacement and adding temporary venting.The precooling process of 2×10~4m~3bimetallic full-volume tank was studied,and the precooling simulation was carried out for the commissioning of bimetallic full-volume tank for atmospheric pressure liquid ethylene,and different precooling rates were selected for comparison based on the actual production situation,and the optimal scheme was determined and field tests were carried out.The results show that the optimized chemical cleaning and passivation scheme of the butadiene system improves the work efficiency,and the four bullet tanks and process pipe network of the butadiene system are successfully fed at one time,with no fault interval and no accident stoppage,and the nitrogen consumption is reduced by about 15%compared with the traditional nitrogen replacement scheme.更多还原