Corrosion and salt deposition problems severely restrict the industrialization of supercritical water oxidation. Transpiring wall reactor can effectively weaken these two problems by a protective water film. In this work, methanol was selected as organic matter, and the influences of vital structural parameters on water film properties and organic matter removal were studied via numerical simulation. The results indicate that higher than 99% of methanol conversion could be obtained and hardly affected by transpiration water layer, transpiring wall porosity and inner diameter.Increasing layer and porosity reduced reactor center temperature, but inner diameter's influence was lower relatively. Water film temperature reduced but coverage rate raised as layer, porosity, and inner diameter increased. Notably, the whole reactor was in supercritical state and coverage rate was only approximately 85% in the case of one layer. Increasing reactor length affected slightly the volume of the upper supercritical zone but enlarged the subcritical zone.
Reactor corrosion and salt deposition problems severely restrict the
industrialization of supercritical water oxidation. Transpiring wall
reactor can effectively weaken these two problems through a protective
water film formed on its internal surface. In this work, the effects of
key structural parameters on water film properties of transpiring wall
reactor were explored by numerical simulation, and established models
were validated by comparing simulation and experimental values. The
results show that transpiration water layer, transpiring wall porosity
and inner diameter hardly affected organic matter degradation.
Increasing transpiration water layer and transpiring wall porosity
reduced reactor center temperatures in the middle and lower zones of the
reactor. Increasing transpiration water layer, transpiring wall porosity
and inner diameter decreased water film temperatures but increased water
film coverage rates. Increasing reactor length affected slightly on the
volume of the upper supercritical oxidation zone but enlarged the
subcritical zone.
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