摘要
介绍了300 kt/a半再生催化重整装置加氢单元的运行状况,针对加氢反应器压力降升高、加氢进料/加氢产物换热器内漏导致精制石脑油硫含量超标原因进行了系统分析,通过变更操作条件、比对精制油硫含量,排除加氢催化剂FH-40B失活的可能性。通过检测、比对换热器低硫端油样中的总硫含量来判断换热器的内漏位置,结果表明,该方法准确可靠,操作简单。并指出原料油携带重质馏分油及腐蚀残渣是反应器压力降升高的重要因素,垢下腐蚀和H2S-HCl-H2O-NH3酸性腐蚀是换热器E102E管束减薄直至发生穿孔的主要原因。提出原料油进料线上设置过滤器、增设1台高温脱氯器、优化注水部位及注水量、稳定原料油性质、石油脑进料直供及选择合适设备材质等措施,以保证装置长周期运行。
The operation status of the 300 kt/a naphtha hydrofining plant is introduced. The causes resulting in the excess sulfur problems such as increase of the pressure drop and internal leaks in heat exchangers in SINOPEC Xi＇ an Petrochemical Company during the operation are analyzed. The leakage location is determined through detecting the sulfur content of the oil samples in different heat exchangers. The results show that this method is simple and accurate. The heavy distillate oil and corrosion residue in naphtha are mainly ascribed to the increase in pressure drop of the reactor. The corrosion under the scale and H2 S-HC1-H20-NH3 uniform corrosion are mainly attributed to the decrease in tube wall thickness of heat exchanger and the resulting internal leaks. The suggestions are proposed to ensure the long period operation,including adding a filter and a high-temperature deehlorination reactor, optimizing waterflood scheme, stable quality of raw materials, direct supply of naphtha feed and suitable materials for heat exchangers.
出处
《现代化工》
CAS
CSCD
北大核心
2015年第3期127-130,共4页
Modern Chemical Industry
关键词
加氢
压力降
腐蚀
措施
naphtha hydrofining
pressure drop
corrosion
countermeasures
