The controlled air oxidation technology is a promising way of disposing medical waste, which has been a huge challenge in
China. It converts waste through partial oxidation into a gaseous mixture, small quantities of char and condensable compounds.
But operational performance of the primary chamber of the controlled air incinerator is poorly understood, leading to difficulty
in control. In this paper, a packed-bed reactor was established to study the effect of O
2 concentration on sawdust oxidation. The feed gas flow rate was kept constant at 0.6 m
3/h at room temperature (26 °C) with O
2 concentrations varied from 6% to 12%. Temperature profiles of the beds, product yields and gas compositions in the out-of-bed
fuel gas were measured in detail. The results showed that the sawdust beds achieved low temperatures for the given O
2 concentrations and leveled off in the oxidation processes. The bed temperatures increased and the solid yields decreased
with the increase of O
2 concentrations. When the O
2 concentration was 10%, the gas yield reached a minimum and the liquid reached a maximum correspondingly. When the O
2 concentration increased from 6% to 10%, the peak concentrations of CO and CH
4 in the gas yield increased. However, when the O
2 concentration exceeded 10%, CO and CH
4 concentrations decreased. As O
2 concentration varied from 6% to 12%, CO
2 concentration increased continuously. This study provides a fundamental insight that the reaction processes could be well
regulated by means of adjusting the feed air in practical units.
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