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Carbon Capture and Sequestration (CCS) Technology (Basic Remarks)
Published in K. S. Birdi, Surface Chemistry of Carbon Capture, 2019
Another method that is reported is called chemical looping combustion (CLC). Chemical looping uses a metal oxide as a solid oxygen carrier. Metal oxide particles react with a solid, liquid, or gaseous fuel in a fluidized bed. AIR (CO
Free Energies of Metallic Compounds
Published in Alan Cottrell, An Introduction to Metallurgy, 2019
Clearly, if the free energy of reaction is to change strongly with temperature, gas must be either produced or consumed in the reaction. When metal(solid)+oxygen(gas)→oxide(solid)
Growth Kinetics of Aerobic Granules
Published in Yu Liu, Wastewater Purification, 2007
where Sgas is the oxygen concentration in the gas phase, Ssur is the oxygen concentration on the granule surface, equal to that in bulk liquid when the liquid-solid oxygen transfer resistance is ignored. Ds is the diffusion coefficient of oxygen in water. S is the oxygen concentration at the radius of r. Jsur is oxygen flux on the granule surface, and α is the gas-liquid interfacial coefficient.
Optimization of geometric parameters of ejector for fuel cell system based on multi-objective optimization method
Published in International Journal of Green Energy, 2023
Mingtao Hou, Fengxiang Chen, Yaowang Pei
In order to obtain satisfactory optimization results, the initial values of the other key geometric parameters are selected within the range provided by the researchers. Zhang (Zhang 1999) suggested that the nozzle exit divergence angle should be in the range of 6° to 12°. Zhu et al (Zhu et al. 2017). designed an ejector with a mixing chamber convergence angle of 40°, and Zhu et al (Zhu, Jiang, and Geometry Optimization Study of Ejector in Anode Recirculation Solid Oxygen Fuel Cell System 2011). also considered that the optimal nozzle exit position is 0 to 2 times the mixing chamber diameter. Pei et al (Pei et al. 2019). suggested that the optimal mixing chamber diameter is 3 to 3.54 times the nozzle throat diameter, and in addition, they also considered that the mixing chamber length is closely related to the primary flow rate and that the optimal mixing chamber length is 1 to 3 times the mixing chamber diameter over the full operating range of the fuel cell. The initial values of the geometric parameters of the ejector are given in Table 1.
Oxygen concentration measurement and control of lead-bismuth eutectic in a small, static experimental facility
Published in Journal of Nuclear Science and Technology, 2020
Xian Zeng, Qinsheng Wang, Xie Meng, Zhao Chen, Yong Zhang, Qinzhi Yan, Yuezhou Wei
The main component of a solid phase oxygen control system is the mass exchanger. The mass exchanger consists of a volume filled with structurally stable and heat-resistant PbO pebbles. The solid phase oxygen control device uses lead oxide particles to dissolve and supplement oxygen for LBE by regulating the temperature and the LBE flow rate at the mass exchanger. The reduction adopts Ar+5%H2. The results of the solid phase oxygen control experiments are shown in Figure 7. The lead-bismuth eutectic temperature was 400°C. When the oxygen concentration was reduced by Ar+5%H2 – and the oxygen concentration was reduced to the target value of 9.7 × 10−7 wt.% – the oxygen was controlled by the automatic control of the LBE via the solid oxygen control mass exchanger.
Experimental Study on the Characteristics of the Spontaneous Combustion of Coal at High Ground Temperatures
Published in Combustion Science and Technology, 2022
Huilin Jia, Yang Yang, Wanxing Ren, Zenghui Kang, Jingtai Shi
It has been suggested that the primary oxidation mechanism is the reaction of aliphatic groups with oxygen (Tahmasebi et al. 2012). The spontaneous combustion process involves these groups consuming oxygen and forming solid oxygen-containing compounds, which then thermally decompose into gaseous oxidation products such as carbon monoxide, ethylene, hydrogen and others (Wang, Dlugogorski, Kennedy 2003). These gasses are commonly used as indicators of the state of coalbed methane (Xie et al. 2011).