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Deposition From a Sour Heavy Oil Under Incipient Coking Conditions: Effect of Surface Materials and Temperature

机译：初期焦化条件下从酸重油中沉积：表面材料和温度的影响

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摘要

Fouling in vacuum tower furnaces has been a great challenge in refineries. At the elevated temperatures of these units, coke deposition is common. For sour oils, iron sulfide also accumulates in the carbonaceous deposits, arising from iron dissolved in the feed or from corrosion of metal surfaces. In this work, the combined fouling mechanism is investigated using an atmospheric tower bottom stream which contains 4.1 wt.% sulfur, and 744 wppm dissolved iron. Isothermal deposition experiments running for 6-24 hours have been carried out on a rotating cylinder in a 600-ml batch reactor, at bulk temperatures of 380-410℃ and cylinder rotation speeds of 300 rpm. A ring of either carbon steel or alloy is mounted in the cylinder to serve as a corroding or noncorroding surface, respectively. After each experiment, the thickness and weight of deposit on the metal ring are determined. The compositions of deposit are characterized. The rates of deposit formation on the ring and the deposit composition are reported as functions of temperature for a number of metal surfaces. Radial profiles of deposit composition are presented. The probable fouling mechanisms are discussed, based on the present results.
机译：真空塔式炉的结垢一直是炼油厂的巨大挑战。在这些单元的高温下，焦炭沉积是常见的。对于酸性油，硫化铁还会在碳质沉积物中积聚，这是由进料中溶解的铁或金属表面的腐蚀引起的。在这项工作中，使用含有4.1 wt。％的硫和744 wppm的溶解铁的常压塔底流研究了组合的结垢机理。在600-ml间歇式反应器中的旋转圆筒上进行了6-24小时的等温沉积实验，整体温度为380-410℃，圆筒旋转速度为300 rpm。碳钢或合金制成的环安装在气缸中，分别用作腐蚀表面或非腐蚀表面。在每个实验之后，确定在金属环上的沉积物的厚度和重量。表征沉积物的组成。环上的沉积物形成速率和沉积物组成被报告为许多金属表面温度的函数。给出了沉积物成分的径向分布。基于目前的结果，讨论了可能的结垢机理。

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  • 来源
    《Heat Transfer Engineering》 |2015年第8期|623-631|共9页
  • 作者

    WEI WANG; A. PAUL WATKINSON;

  • 作者单位

    Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, British Columbia, Canada;

    Department of Chemical and Biological Engineering, The University of British Columbia, Vancouver, BC, Canada V6T 1Z3;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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