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

加热金属表面 Na2SO4 和 Na2CO3 火焰生成沉积的详细化学机制：对高温腐蚀及其控制的影响

• 批准号: 9020355
• 负责人: Keith Schofield
• 金额: $ 15万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-08-15 至 1995-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9020355&HistoricalAwards=false
• 关键词: Detailed; Chemical; Mechanisms; Na2SO4; Na2CO3

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.

H2/CO/O2/N2的实验室火焰将在一系列化学计量学中进行研究，其中含有硫和钠，以确定控制冷却基底材料上硫酸钠和碳酸盐沉积物形成的化学性质。利用Na- d反转测量温度，利用LIF测量原子Na和OH谱，利用原位拉曼散射测量表面沉积成分，可以建立沉积过程的动力学模型。衬底材料和温度的影响，以及气相组分的种类将被确定。特别是，Na2SO4和Na2CO3层形成的可逆性将作为火焰条件的函数进行检查。这个程序将解决化学控制的性质，形成沉积物的硫酸钠和碳酸盐从火焰在冷却的底物。它将确定气相中的哪些物种参与了这些盐的非均相表面生产。这些知识将需要开发燃烧改性策略，以尽量减少高温腐蚀和沉积在含硫和含钠系统中。