Management of Acute Particulate Fouling in a Titanium Dioxide Reactor System

Vincent Y. Lister; John F. Davidson; Stephen J. Sutcliffe; D. Ian Wilson

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Management of Acute Particulate Fouling in a Titanium Dioxide Reactor System

机译：二氧化钛反应器系统中急性颗粒结垢的管理

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The gas-phase manufacture of titanium dioxide is subject to acute fouling in the cooler unit located directly downstream of the reactor which quenches the reaction. A model of the cooler system was constructed, incorporating aspects of compressible flow, multimode heat transfer, fouling, and changes in geometry. This indicated that deposition could be very rapid. The effect of deposit layer buildup required measurement of the thermal conductivity of the porous layer; this was achieved using a novel testing device similar to that reported by Tan et al. (2006), for measuring the thermal conductivity of surface coatings. Active mitigation techniques are employed to reduce the effect of rapid fouling. The effectiveness of adding an erodent, in this case sand, to the flow was appraised by studying the breakup of deposit layers by impinging particles. The experimental conditions (high-temperature chlorine gas, high flow velocities) were simulated in cold experiments by matching the inertia and size of test particles to those of the sand. These studies showed that sand at the feed size would detach deposits, but could result in breakage of the sand particles. Mitigation efficiency is then determined by sand distribution and redistribution.

机译：气相法生产的二氧化钛在直接位于反应器下游的冷却器单元中会严重结垢，从而终止反应。构建了冷却器系统的模型，其中结合了可压缩流，多模式传热，结垢和几何形状变化等方面。这表明沉积可能非常迅速。沉积层堆积的影响需要测量多孔层的热导率。这是使用类似于Tan等人报道的新型测试设备实现的。（2006年），用于测量表面涂层的热导率。采用主动缓解技术来减少快速结垢的影响。通过研究撞击粒子使沉积层破裂，评估了在流体中添加侵蚀剂（在这种情况下为沙子）的有效性。通过将测试颗粒的惯性和大小与沙子的惯性和大小相匹配，在冷实验中模拟了实验条件（高温氯气，高流速）。这些研究表明，进料尺寸的沙子会分离出沉积物，但可能导致沙子颗粒破裂。然后，通过砂分布和再分布来确定缓解效率。

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来源
《Heat Transfer Engineering》 |2017年第8期|796-804|共9页
作者
Vincent Y. Lister; John F. Davidson; Stephen J. Sutcliffe; D. Ian Wilson;
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作者单位

Department of Chemical Engineering and Biotechnology, Cambridge, United Kingdom;

Department of Chemical Engineering and Biotechnology, Cambridge, United Kingdom;

Huntsman Pigments and Additives, Wynyard, United Kingdom;

Department of Chemical Engineering and Biotechnology, Cambridge, United Kingdom;

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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);
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正文语种 eng
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Management of Acute Particulate Fouling in a Titanium Dioxide Reactor System

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