The Detailed Chemical Mechanisms for Na2SO4 and Na2CO3 Flame Generated Deposition on Heated Metal Surfaces: Impli-cations for High Temperature Corrosion and its Control

H2/CO/O2/N2的实验室火焰将在一定范围内进行研究 的化学计量接种硫和钠物种， 确定化学控制的性质 硫酸钠和碳酸盐沉积物的形成 冷却基板材料。 通过测量温度 使用Na-D反转，使用LIF的原子Na和OH分布，以及 该表面存款组合物使用原位拉曼 散射，沉积过程的动力学模型可以是 开发 基底材料和温度的影响，以及 将确定气相物质的组成。 特别是，Na 2SO 4和Na 2CO 3的可逆性 层 将作为火焰条件的函数来检查积聚。 这个程序将解决化学性质 控制硫酸钠沉淀的形成， 在冷却的基底上从火焰中产生碳酸盐。 它将建立 气相中的哪些物质参与了 这些盐的非均相表面产生。 等 开发燃烧改进技术需要知识 减少高温腐蚀的策略， 在含硫和钠的体系中沉积。

Laboratory flames of H2/CO/O2/N2 will be studied over a range of stoichiometries seeded with sulfur and sodium species to determine the nature of the chemistry controlling the formation of deposits of sodium sulfate and carbonate on cooled substrate materials. With measurements of temperature using Na-D reversal, atomic Na and OH profiles using LIF, and the surface deposit composition using in-situ Raman scattering, a kinetic model for the deposition process can be developed. Effects of substrate material and temperature, and the composition of the gas phase species will be determined. In particular, the reversibility of the Na2SO4 and Na2CO3 layer build-up will be examined as a function of flame conditions. This program will resolve the nature of the chemistry controlling the formation of deposits of sodium sulfate and carbonate from flames on cooled substrates. It will establish which species in the gas phase are involved in the heterogeneous surface production of these salts. Such knowledge will be needed to develop combustion modification strategies to minimize high temperature corrosion and deposition in sulfur and sodium containing systems.