乙烯裂解炉炉管痕量元素Pb含量测定方法
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摘要
乙烯裂解炉炉管中痕量元素Pb为有害杂质,在高温拉伸应力的作用下,Pb元素会在晶界偏聚,降低了炉管材料的抗蠕变性能和高温持久性能,导致炉管服役寿命大大缩短。乙烯裂解炉炉管成分复杂,对Pb的测定干扰大,目前尚无针对该材料中Pb含量的测定方法。针对乙烯裂解炉离心铸造炉管合金材料的特点,通过优化仪器参数以及添加一种特定的基体改进剂,屏蔽掉基体干扰离子的作用,建立了一个有针对性的、低成本和高效率的检测方法。该方法利用石墨炉原子吸收光谱仪,测定出乙烯裂解炉炉管中痕量元素Pb的含量。
Trace element Pb is regarded as a harmful impurity in ethylene cracking furnace tube. Pb tends to segregate at grain boundary under the action of tensile stress at high temperature, which will lead to performance degradation of creep resistance and high temperature durability. Specific method for Pb content determination is not available at present due to complex tube matrix and interference of coexisting ions. Based on the feature of alloy material for centrifugal casting furnace tube, matrix interference was shielded by optimizing instrument parameters and adding specific matrix modifier. Consequently, an appropriate detection method with low-cost and high-efficiency was established, with which Pb content in furnace tube was determined by employing graphite furnace atomic absorption spectrometer.
Trace element Pb is regarded as a harmful impurity in ethylene cracking furnace tube. Pb tends to segregate at grain boundary under the action of tensile stress at high temperature, which will lead to performance degradation of creep resistance and high temperature durability. Specific method for Pb content determination is not available at present due to complex tube matrix and interference of coexisting ions. Based on the feature of alloy material for centrifugal casting furnace tube, matrix interference was shielded by optimizing instrument parameters and adding specific matrix modifier. Consequently, an appropriate detection method with low-cost and high-efficiency was established, with which Pb content in furnace tube was determined by employing graphite furnace atomic absorption spectrometer.
引文
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[3] 郑显伟.我国乙烯裂解炉辐射炉管的使用状况[J].压力容器,2013,30(5):45-52.
[4] 叶娟,李毅,陈涛,等.Pb对离心铸造35Cr45NiNb合金炉管蠕变断裂的影响[J].化工设备与管道,2016,53(3):29-33.
[5] 黄一石.仪器分析[M].北京:化学工业出版社,2002:83-84.
[6] 邓勃,何华炮.原子吸收光谱分析[M].北京:化学工业出版社,2004:236-237.
[7] 陈安明.电感耦合等离子体原子发射光谱法测定碳钢及生铁中痕量砷锑铋锡铅.冶金分析[J].2007,27(3):68-69.
[8] 朱莉.石墨炉原子吸收光谱法测定铁/镍基高温合金中痕量砷[J].特钢技术,2012,18(2):45.
[9] 吴诚金属材料化学分析300问[M].上海:上海交大出版社,2003:102-103.
[10] 张克义,朱娜.石墨炉原子吸收光谱法测定铅应注意的问题[J].监督与选择,2009(2):75.
[11] 李安模,魏继中.原子吸收及原子荧光光谱分析[M].北京:科学出版社,2000:167.