Thermal effect models output

The effect of the H2/oil ratio on the coke content of a NtV/SiOj catalyst (low HDS activity, thermal coke predominates) is shown in Figure 6. The distinct maximum of the coke deposited with the H2/oil ratio is apparent from both experiment and theory. Detailed analysis of the model output indicates that at low gas rates the VGO feedstock is mainly in the liquid phase throughout the reactor, whilst at the highest gas rates the reactor is operated in the gas phase already at the reactor inlet. In both limits the amount of coke deposited is modest. Intermediate gas rates (1000 Nl/kg), however, lead to much higher rates of coke... 

The nature of a BMT study is well demonstrated with BMT3 of the DECOVALEX I project. It was a problem associated with a near-field repository model, set up as a two-dimensional plane-strain problem in which a tunnel with a deposition hole was located in a fractured rock mass. The model is 50 X 50 m in size, and situated at 500 m below the ground level (Figure 1). The fracture network is a two-dimensional realization of 6,580 fractures from a realistic three-dimensional fracture network model of the Stripa Mine, Sweden (Figure 2). The problem is set up as a fully coupled THM near-field repository problem, with thermal effects caused by heat release from radioactive waste in the deposition hole (the heater). Heat output decreases... 

The intensive water-sulfuric acid interaction (fe = 10 1 1/moEs) and substantial thermal effect (q = 196 kilojoules/kg) result in 84 °C adiabatic increase of temperature in an extremely small local area of the reaction volume (L ooi = 10 1 m). In this case, technologically acceptable conditions (reactor temperature does not exceed 70 °C (343 K)) can be achieved in a two-zone operation model with the partial feed of a 90% acid solution into two zones, separated by the cooling area. This approach provides a technologically acceptable temperature mode for the process. In addition, the partial feeding of acid allows a 20% reduction of the device s radius in the first zone (from 0.01 to 0.008 m). It favours both the required level of flow turbulence and the increase of external heat removal output (additional 15-20% decrease of The maximum... 

The primary output of thermal radiation models is the received thermal radiation at various target locations. Fire durations should also be estimated as these affect thermal effects (Section 4.3). 

In the calculation, the inner and outer radiuses of mixed layer were changed by 0.5 cm step to simulate the effect of dose reduction. The density of mixture was calculated theoretically from the inner and outer radiuses. Although strontium has many isotopes, we treated Sr only. From this condition the model included 2.9 X 10 Bq of Sr at the outset and its thermal output became 52 kW. 

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