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中文摘要: 重型发电燃气轮机低排放、高效率的发展目标，要求燃气轮机透平的进气温度不断提高。热障涂层作为 保护金属热端部件的重要手段，是实现这一目标的关键技术之一。目前世界上最先进的 J 级燃气轮机的透平进 口温度已经达到 1600°C，热端部件表面温度超过 1250°C，传统的 YSZ 热障涂层已经不能满足这一发展需求， 因此迫切需要开发温度更高、热导率更低的新型热障涂层。本文对 La2(Zr0.7Ce0.3)2O7( 以下简称 LZ7C3) 热障涂层 在重型发电燃气轮机中的应用进行了初步验证。结果表明，LZ7C3 涂层具有比常规 YSZ 热障涂层更低的热导率 (0.79~0.48Wm-1K-1，相对传统 YSZ 涂层下降 30% 以上)，且在 1250°C的高温火焰台架试验中表现出优良的热 循环寿命(> 7370 次)，具有良好的应用前景。
中文关键词: 重型燃气轮机 热循环寿命 La2(Zr0.7Ce0.3)2O7
Abstract:Gas inlet temperature has been increasing for power generation gas turbines in the pursuit of lower emission and higher thermal efficiency. Thermal barrier coating system (TBCs), which can protect the metallic components from hot gas, is one of the most essential technologies to achieve the target. State of the art gas turbine of J class gas turbine has improve the turbine inlet temperature to 1600°C , which means that advanced TBCs with lower thermal conductivity and better high-temperature stability than current commercial Y2O3 partially stabilized ZrO2 (YSZ) TBCs must be developed. In this paper, a preliminary study was undertaken to evaluate the possibility of applying La2(Zr0.7Ce0.3)2O7 (LZ7C3) based TBCs for the gas turbines with higher turbine inlet temperature. Results showed that the thermal conductivity of plasma sprayed LZ7C3 coating decreased from 0.79 Wm-1K-1 at room temperature to 0.48 Wm-1K-1 at 1000°C , which was much lower than those of traditional YSZ coating. Gas burner thermal cycling results showed that the lifetime of LZ7C3/YSZ double-ceramic-layer TBCs at operating temperatures 1250°C was more than 7370 cycles. The preliminary results meant that LZ7C3 is a promising TBCs material for future ultra-efficient and low-emission turbine systems.
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基金项目:
| 作者 | 单位 |
| 汪超 | 上海电气燃气轮机有限公司燃气轮机研究所 |
| 周鑫 | 武汉理工大学硅酸盐建筑材料国家重点实验室 |
| 解旭阳 | 上海电气燃气轮机有限公司燃气轮机研究所 |
| 张宏琦 | 上海电气燃气轮机有限公司燃气轮机研究所 |
| 何磊 | 上海电气燃气轮机有限公司燃气轮机研究所 |
| 曹学强 | 武汉理工大学硅酸盐建筑材料国家重点实验室 |
引用文本：
汪超,周鑫,解旭阳,张宏琦,何磊,曹学强.重型燃气轮机用 La2(Zr0.7Ce0.3)2O7/YSZ 双层热障涂层热循环性能研究[J].热喷涂技术,2019,11(3):14-21.
Chao Wang,Xin Zhou,Xuyang Xie,Hongqi Zhang,Lei He,Xueqiang Cao.Thermal Cycle Behavior of La2(Zr0.7Ce0.3)2O7/YSZ Double-layer Thermal Barrier Coatings for Heavy Duty Gas Turbines[J].Thermal Spray Technology,2019,11(3):14-21.
汪超,周鑫,解旭阳,张宏琦,何磊,曹学强.重型燃气轮机用 La2(Zr0.7Ce0.3)2O7/YSZ 双层热障涂层热循环性能研究[J].热喷涂技术,2019,11(3):14-21.
Chao Wang,Xin Zhou,Xuyang Xie,Hongqi Zhang,Lei He,Xueqiang Cao.Thermal Cycle Behavior of La2(Zr0.7Ce0.3)2O7/YSZ Double-layer Thermal Barrier Coatings for Heavy Duty Gas Turbines[J].Thermal Spray Technology,2019,11(3):14-21.