The equilibrium phases and adiabatic temperature for combustion synthesis and reaction hot pressing of Al 2O 3/B 4C employing ① Al, B 2O 3 and C ② C, B, Al 2O 3 as starting reactants were analyzed by the CALP...The equilibrium phases and adiabatic temperature for combustion synthesis and reaction hot pressing of Al 2O 3/B 4C employing ① Al, B 2O 3 and C ② C, B, Al 2O 3 as starting reactants were analyzed by the CALPHAD technique. It is shown that the equilibrium phases at the adiabatic temperature in the combusion system (1) are not the intended composite Al 2O 3/B 4C but other phases. Good agreement with the experimental data was achieved for the calculated adiabatic temperature. The results were discussed with respect to the elimination of the by product in the combustion synthesis. It also revealed that the reactant mixture (2) is a weak exothermic or endothermic reaction system, which can be employed in the reaction hot pressing.展开更多
Previous studies resulted in an improved nonslagging spoutingcyclone combustor with twostage combustion in perpendicular vortex flows, developed for clean coal combustion in small industrial furnaces and domestic fu...Previous studies resulted in an improved nonslagging spoutingcyclone combustor with twostage combustion in perpendicular vortex flows, developed for clean coal combustion in small industrial furnaces and domestic furnaces. An isothermal model test and a combustion test give encouraging results. The temperature and gas composition in the combustion experiments were measured using thermocouples and a COSA6000CD portable stack analyzer. The combustion temperature distribution was uniform. The geometry was compared further to provide stronger recirculation in the spouting zone and a strong swirling effect in the cyclone zone. These results indicate that the improved geometrical configuration of the combustor favors to the stabilization of the coal flame and intensified coal combustion, and it provides a basis for practical application of this technique.展开更多
文摘The equilibrium phases and adiabatic temperature for combustion synthesis and reaction hot pressing of Al 2O 3/B 4C employing ① Al, B 2O 3 and C ② C, B, Al 2O 3 as starting reactants were analyzed by the CALPHAD technique. It is shown that the equilibrium phases at the adiabatic temperature in the combusion system (1) are not the intended composite Al 2O 3/B 4C but other phases. Good agreement with the experimental data was achieved for the calculated adiabatic temperature. The results were discussed with respect to the elimination of the by product in the combustion synthesis. It also revealed that the reactant mixture (2) is a weak exothermic or endothermic reaction system, which can be employed in the reaction hot pressing.
文摘Previous studies resulted in an improved nonslagging spoutingcyclone combustor with twostage combustion in perpendicular vortex flows, developed for clean coal combustion in small industrial furnaces and domestic furnaces. An isothermal model test and a combustion test give encouraging results. The temperature and gas composition in the combustion experiments were measured using thermocouples and a COSA6000CD portable stack analyzer. The combustion temperature distribution was uniform. The geometry was compared further to provide stronger recirculation in the spouting zone and a strong swirling effect in the cyclone zone. These results indicate that the improved geometrical configuration of the combustor favors to the stabilization of the coal flame and intensified coal combustion, and it provides a basis for practical application of this technique.
