Increasing the porosity of the bed, which means participation in the reduction reaction of particles along the furnace height increases continuously reduce burning carried out, the particle size is decreasing, and effective response surface is also declining. Thus the reduction rate decreasing with

beds of the clearance rate is increasing, which means that the particles involved in reaction furnace height along the Increase continued to decline and, as a result of combustion, particle size decreases, effective response surface are also on the decline. And thus restore furnace with high rates o

The bed level percentage of voids increases unceasingly, also meant the participation electronation reaction the pellet reduces unceasingly along the chamber high increase, because simultaneously burns march, the particle size reduces unceasingly, the effective response surface unceasingly is also r

Increasing rate of gap bed, also means participation in the reduction of particles along the shrinking of furnace height increase, at the same time as combustion, particle size and constantly decreasing, effective response surface has been reduced. Restore rates continually decrease as the hearth he

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