Preliminary experimental study of a supercritical CO2 power cycle test loop with a high-speed turbo-generator using R134a under similarity conditions
Preliminary experimental study of a supercritical CO2 power cycle test loop with a high-speed turbo-generator using R134a under similarity conditions
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DOI：
10.1007/s11708-017-0504-4
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发表时间：
2017-10
影响因子：
2.9
通讯作者：
Junhyun Cho;Hyungki Shin;Jongjae Cho;Young-Seok Kang;H. Ra;C. Roh;Beomjoon Lee;Gilbong Lee;Byunghui Kim;Y. Baik
中科院分区：
文献类型：
--
作者：
Junhyun Cho;Hyungki Shin;Jongjae Cho;Young-Seok Kang;H. Ra;C. Roh;Beomjoon Lee;Gilbong Lee;Byunghui Kim;Y. Baik
最近，已经进行了将超临界二氧化碳动力循环（S-CO2）代替蒸汽朗肯循环或空气布雷顿循环应用于聚光太阳能发电（CSP）的研究。S-CO2系统由于其紧凑、高效和干式冷却能力而适合于CSP。在韩国能源研究所（KIER），为了实现S-CO2系统，开发了一个10 kWe级的测试回路，其中涡轮发电机-压缩机（TAC）使用气体箔片轴承。然后，开发了具有高速径向型涡轮发电机的基本亚kWe级测试回路和具有数十kWe容量的具有轴向型涡轮发电机的测试回路。为解决S-CO2脱硫的技术瓶颈，汽轮发电机采用了部分进汽喷嘴和油润滑轴承。为了体验闭式动力循环并开发在高压下运行S-CO2的运行策略，进行了使用制冷剂作为工作流体的有机朗肯循环（ORC）运行测试，因为其在约30至40 bar的相对低压条件下的运行能力。通过使用R134 a代替CO2作为工作流体来操作亚kWe级测试回路，获得了400 W的平均涡轮机功率。
Research on applying a supercritical carbon dioxide power cycle (S-CO2) to concentrating solar power (CSP) instead of a steam Rankine cycle or an air Brayton cycle has been recently conducted. An S-CO2system is suitable for CSP owing to its compactness, higher efficiency, and dry-cooling capability. At the Korea Institute of Energy Research (KIER), to implement an S-CO2system, a 10 kWe class test loop with a turbinealternator-compressor (TAC) using gas foil bearings was developed. A basic sub-kWe class test loop with a highspeed radial type turbo-generator and a test loop with a capability of tens of kWe with an axial type turbogenerator were then developed. To solve the technical bottleneck of S-CO2turbomachinery, a partial admission nozzle and oil-lubrication bearings were used in the turbogenerators. To experience the closed-power cycle and develop an operational strategy of S-CO2operated at high pressure, an organic Rankine cycle (ORC) operating test using a refrigerant as the working fluid was conducted owing to its operational capability at relatively lowpressure conditions of approximately 30 to 40 bar. By operating the sub-kWe class test loop using R134a as the working fluid instead of CO2, an average turbine power of 400 W was obtained.