Modeling and simulation of aqueous hazardous waste oxidation in deep well reactors

Modeling of supercritical oxidation of aqueous wastes in a deep‐well reactor

“…0~ These figures show that the reactor exhibits multiple steady state for all Damkohler numbers within the range of interest. This behavior is similar to that observed by Lovo et al (1990). The maximum flow rate, however, is limited by hydrodynamical consideration rather than the oxidation kinetics.…”

“…The value U:= 2.0 W .m-2.K-' has been chosen as a base value in our computations. This is well below the value U: =5.7 W.m-2.K-' used by Lovo et al (1990).…”

“…It also depends on the temperature history of the up-tube. In addition, the approach used by Lovo et al (1990) for estimation of heat losses is favorable from a computational point of view. Therefore, we model the heat losses to the surrounding strata in a way similar t o that of Lovo et al (1990) where T, is the temperature of the earth at a depth z given by:…”

“…The above model equations are written in a form similar to that used by Lovo et al (1990) T represents the change in the internal energy of reaction stream due an increase in the temperature by AT (while keeping pressure constant). This suggests that the amount of energy required to raise the temperature of the reaction stream above that corresponding to the locus of maximal cp is large, if the pressure is only slightly above the critical value.…”

“…Tezduyar et al (1987) and Mittal et al (1991) analyzed the startup procedures of the deep-well reactor for the case of a constant heat source. Lovo et al (1990) presented steady-state results of modeling and simulation of the deep-well process for subcritical conditions. Lovo and Balakotaiah (1992a,b) addressed an important issue in the design and operation of deep-well reactors, that is, the autothermal operation and its effect on the ignition and extinction behavior of the reactor.…”