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A nano-Sc2O3-added W powder for use in high current density thermionic cathodes has been made using a solution-gel method with the following controllable uniform average particle sizes: ~72, 146, 272, and 587 nm. Using these powders, nanostructured Sc2O3 -added tungsten matrices with uniform nanosized tungsten grains and homogenous pore distribution were obtained. Nanocomposite Sc2O3-added W impregnated...
This paper analyzes the techno-economic performance of 600 MW coal-fired power plant with and without ammonia-based CO2 capture process, based on the operating data of an existing power plant. The simulation and analysis, with fully consideration of features of existing coal-fired power plants and the integration of CO2 capture process with steam cycle, are made to reveal the thermal and environmental...
Both kinds of 10 cm diameter thermionic dispenser cathode have been fabricated at BVERI. One is impregnated scandate (I-Sc) cathode and the other is traditional Ir-coated “M” cathode with 411 impregnant. Figure 1 is the photograph of Φ10 cm cathode assembly. The scandate cathode can deliver the same density as “M” cathode but 80-100°C lower in temperature, though it needs higher vacuum than “M” cathode...
The new hollow cathode assemblies (HCAs) based on a tungsten matrix impregnated with barium calcium aluminates have been developed at BVERI. The assembly heater and advanced brazing technique are adopted to improve the compatibility of thermal and mechanical structure, as well as reliability and lifetime. The HCA are designed to deliver currents up to 5A for ion thruster or Hall thruster. This paper...
The objective of this investigate is to evaluate the variation in yield and fuel quality of corn stover under different harvest time and to determine appropriate harvest time. Using Zhengdan 958 as research material, the effect of harvest time on yield and fuel quality of corn stover was studied under field conditions in Baicheng Academy of Agricultural Sciences, during 2007-2008. Results showed that...
Combustion of coal mine ventilation air methane (VAM) was investigated in a thermal reverse-flow reactor. Effects of CH4 concentration, VAM flow and temperature were studied. The results show that combustion of coal mine ventilation air methane be achieved for methane concentration of 0.2%~0.8% in reactor. The conversion rates of CH4 are all above 99%.Some heat could be recovered. With the increase...
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