克劳斯工艺防腐蚀涂层数值模拟

燃料、烟气中的高浓度硫化氢以及液滴对克劳斯工艺中燃烧设备有严重的腐蚀和冲蚀作用，很容易引发大型生产安全事故。液滴的冲蚀在金属受热面壁面产生细微裂纹是化学腐蚀的起点。涂层能够防止化学腐蚀，本文通过建立数学模型准确描述了克劳斯硫黄回收工艺中液滴撞击防腐蚀涂层的过程，运用离散迭代方法对整个计算区域进行求解，得到了撞击过程中防腐蚀涂层内部、涂层与固体黏结面以及固体内部的应力分布，确认了涂层方案能够在克劳斯硫黄回收工艺中解决金属受热面液滴冲蚀的问题；同时研究了不同厚度的涂层对应力分布的影响，得出了量纲为1最大应力与撞击速度之间的经验公式，提出采用20μm厚的氮化硅涂层是经济高效的克劳斯工艺壁面保护措施。

Numerical simulation study on anti-corrosion coating of Claus process

The high concentration of hydrogen sulfide in fuel and flue gas and liquid droplets have serious corrosion and erosion effects on the combustion equipment in Claus process, which is easy to cause large-scale production safety accidents. The erosion of the droplet results in fine cracks on the wall surface of the metal heating surface, which is also the starting point of chemical corrosion. Coating can prevent chemical corrosion, this article through the establishment of mathematical model accurately describes the claus sulfur recovery process of droplet impact anti-corrosion coating process, using the discrete iteration method to solve the whole calculation domain, got hit in the process of internal anti-corrosion coating, coating and solid bonding surface and the stress distribution within the solid, confirmed the coating solution can solve the heating surface of metal droplet in the claus sulfur recovery process of erosion problems. At the same time, the effect of different thickness of coating on stress distribution was studied, and it was suggested that 20μm thickness of Si₃N₄ coating was an economical and efficient wall protection measure.