• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>NACE annual conference & exposition >Titanium in High Pressure, High Temperature Wet Oxidation: Twenty Years User Experience
【24h】

Titanium in High Pressure, High Temperature Wet Oxidation: Twenty Years User Experience

机译：高压，高温湿式氧化中的钛：二十年的用户体验

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

After careful testing, Titanium Grade 2 (UNS R50400) and Grade 7 (UNS R52400) wereselected for the high-pressure part of the wet oxidation process (300℃, 150 bar). The definition of anoperating window, which correlates pH, chlorine, phosphorus, sulfur, and related salts and acids in theprocess stream, was necessary for the safe operation of the equipment.Not only were the selection of the materials and the definition of the operating windowcarefully elaborated, but also the operating conditions and especially the passivation of the titaniumsurface. Problems were observed due to inadequate specification of the surface quality, the precipitationbehavior of the water mix and the build up of encrustation. Furthermore, minor changes in theequipment design have lead to dramatic changes of the flow and to rapid erosion.Titanium was the best material choice for this highly oxidizing service, but some measureshad to be taken after careful testing to maintain the passivity of the material. All problems found werecaused by deviations from the specifications. It was clear, that small changes greatly affect the resistanceof titanium. Once the oxide layer was destroyed, titanium exhibited high corrosion rates.
机译：经过仔细的测试，选择了2级钛（UNS R50400）和7级钛（UNS R52400）作为湿法氧化工艺的高压部分（300℃，150 bar）。为了使设备安全运行，必须定义与工作流中的pH，氯，磷，硫以及相关的盐和酸相关的操作窗口，不仅要仔细选择材料和定义操作窗口详细说明了钛合金表面的操作条件，尤其是钝化层。由于表面质量规格不充分，水混合物的沉淀行为以及结壳的形成，发现了问题。此外，设备设计的细微变化已导致流量的急剧变化和快速腐蚀。钛是这种高氧化性服务的最佳材料选择，但在仔细测试后仍需采取一些措施以保持材料的钝化性。发现的所有问题均由与规格的偏差引起。显然，微小的变化会极大地影响钛的电阻。一旦氧化层被破坏，钛表现出高腐蚀速率。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号