（毕业设计论文）《T91钢在500℃和525℃水蒸气下的氧化动力学研究》.doc

PAGE T91钢在500℃和525℃水蒸气下的氧化动力学研究 摘 要 T91钢是目前用于电站锅炉主蒸气管道的主要材料。研究发现T91钢在低于600℃时的氧化动力学规律与600℃以上存在一定的差异性，氧化激活能也存在一定的差异性。 为了进一步完善T91钢的氧化动力学规律，本试验采用热分析天平增重法，对T91钢在500℃水蒸气量在290.3ml/h和479.8ml/h，525℃水蒸气量在313.58ml/h和462.36ml/h时的氧化动力学和氧化激活能进行研究。 研究发现，相同水流量时，随着温度的升高，氧化速率增大；在相同的温度，不同水流量的条件下，500℃时水流量升高，氧化速率增大，而在525℃时，低水流量下的氧化速率明显高于高水流量下的氧化速率。 500℃和525℃时，T91钢在快速氧化阶段和慢速氧化阶段的激活能曲线与600℃以上试样的激活能曲线很接近。 关键词：T91钢；高温水蒸气；氧化动力学；激活能 The Oxidation Dynamics of T91 Steel under Water Vapor Condition at 500℃ and 525℃ ABSTRACT T91 steel is used for the main steam boiler pipes at power station. Now from the study of the T91 steel oxidation kinetics, we can find that there is a certain difference in the law of the oxidation kinetics between 600℃ below and 600℃ above. The activation energy of oxidation of 600℃ below and 600℃ above exists some differences. To further perfect the law of oxidation kinetics of T91 Steel, the Thermal Gravimetric Analysis is used to research the oxidation kinetics of T91 steel in the water vapor 290.3ml/h and 479.8ml/h at 500℃ and water vapor 313.58 ml/h and 462.36ml/h at 525℃. The results show that with the rise of temperature, the oxidation rate increases in the same water discharge. With the rise of water discharge at 500℃ the oxidation rate increases, while at 525℃ the oxidation rate decreases. The activation energy of T91 is nearly between 600℃ above and 500℃and 525℃. Key Words：T91 steel；High-temperature water vapor；Dynamics；activation energy 目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc171074089 摘 要 PAGEREF _Toc171074089 \h I HYPERLINK \l _Toc171074090 ABSTRACT PAGEREF _Toc171074090 \h II HYPERLINK \l _Toc171074091 1综述 PAGEREF _Toc171074091 \h 1 HYPERLINK \l _Toc171074092 1.1 选题背景 PAGEREF _Toc171074092 \h 1 HYPERLINK \l _Toc171074093 1.2 电站锅炉用钢 PAGEREF _Toc171074093 \h 2 HYPERLINK \l _Toc171074094 1.2.1 电站锅炉对钢材的要求 PAGEREF _Toc171074094 \h 2 HYPERLINK \l _Toc171074095 1.2.2 电站锅炉用钢的发展 PAGEREF _Toc171074095 \h 2 HYPERLINK \l _Toc171074096 1.3