多孔質ウスタイトペレット水素還元速度の反応帯を考慮したモデルによる解析
1986 年 72 巻 9 号 p. 1263-1270
詳細
1986 年 72 巻 9 号 p. 1263-1270
Porous wustite pellets were reduced with hydrogen at 900°C, and reduction curves, position of reaction zone and local fractional-reduction profiles were measured.
Basic equation for the grain model was re-examined and solved as it was (unsteady numerical solution), and under quasi-steady (quasi-steady numerical one) and moreover linearization approximations (quasisteady analytical one). When kinetic parameters are selected suitably in each case, measured reduction curves and reaction zone behavior are comparatively well reproduced by the calculated results.
When the unsteady numerical solution is calculated, reducible oxygen density is divided by M to reduce the computation time; the error at M≤2 000 is within a permissible range, although the solution most faithful to the basic equation is obtained at M=1. Comparison between the unsteady and the quasisteady numerical solutions shows that the latter is an approximate solution having rather good accuracy. The quasi-steady analytical solution is better than the others from practical viewpoint, because its computation time is the shortest and degree of agreement between the measured and the calculated results is nearly the same among the three.
