化学链燃烧
流态化
流化床燃烧
燃烧
湍流
粒子(生态学)
粒径
混合(物理)
流化床
停留时间(流体动力学)
航程(航空)
机械
热力学
材料科学
化学
物理
工程类
复合材料
物理化学
海洋学
岩土工程
有机化学
量子力学
地质学
作者
Chen Hu,Zhenshan Li,Xinglei Liu,Weicheng Li,Ningsheng Cai,Sina Tebianian,Stéphane Bertholin,Mahdi Yazdanpanah,Aoling Zhang
出处
期刊:Energy & Fuels
[American Chemical Society]
日期:2020-06-01
卷期号:34 (7): 8575-8586
被引量:7
标识
DOI:10.1021/acs.energyfuels.0c00971
摘要
A circulating turbulent fluidized bed connected with a riser and an annular carbon stripper (CS) is proposed to be used as a fuel reactor (FR) in chemical looping combustion. The bottom section of the FR is operated under a turbulent fluidization regime, which can achieve enough solid residence time and enhance the mixing of the oxygen carrier with solid fuel. A 1.5 MWth cold model of the FR was designed, constructed, and tested to investigate the hydrodynamics of solid particles with different sizes. Three kinds of quartz sands with different particle sizes (d50 = 122, 249, and 392 μm) were used as bed materials to simulate the oxygen carrier. Continuous operation with a reasonable pressure balance was achieved in the cold model. The effects of important variables, including gas velocity, static bed height, and particle size, on the gas–solid hydrodynamics of the FR were measured and discussed. It was found that the transition velocities from bubbling to turbulent fluidization for different particles of d50 = 122, 249, and 392 μm were measured to be 0.78, 0.95, and 1.06 m/s, respectively, indicating that the transition velocity increased with increasing the particle size. The solid fraction profile along the reactor height and solid circulation rate were affected by gas velocity and static bed height. A modified correlation was proposed to predict the solid fraction of the annular CS dilute phase, and the predicted results agree well with the experimental data under a wide range of operational conditions.
科研通智能强力驱动
Strongly Powered by AbleSci AI