Modelling of a moving bed furnace for the production of uranium tetrafluoride. Part 2: Application of the model

Modeling of uranium trioxide to uranium tetrafluoride conversion using a moving bed reactor.

“…Additionally, the model verifies the effects of increasing solid feed temperature and inlet HF flow in the horizontal zone. For the former, it was found that UF 4 fraction in the products remain largely unchanged, and, for the latter, it was found that UF 4 fraction is greatly diminished in the product stream, which is a similar conclusion from (12).…”

“…In order to facilitate a comparison with the existing literature, the results are presented as longitudinal "cuts" of each zone (which is possible due to symmetry), with the radial dimensions varying between 0 (symmetry axis) and R 0 , and the longitudinal dimensions varying between 0 and L. Since the existing literature provides models that assumed different premises and/or left some parameters values undisclosed, only a qualitative analysis will be performed. (12), which states that this reaction is expressive in temperatures above 600 ºC. This leads to an increased production of N 2 and H 2 in this region; however, since H 2 participates in the reduction reactions, the area in which the concentration of each gas is higher is slightly different.…”

“…Another difference is that it neglects the calcination reaction, since a study from the authors revealed that the rate expression and its coefficients over predict the reaction rate (14). In order to validate their model, the authors used the same operating parameters from Dussoubs et al (10,12) and compared the trends of the measured and the calculated data from the same article through the reactor length. Additionally, the model verifies the effects of increasing solid feed temperature and inlet HF flow in the horizontal zone.…”

“…Finally, Bykov et al (15) proposed a "shrinking core" model, based on the studies by Dussoubs et al (10,12), for obtaining the radius of the unreacted part of the solid granule (thus, reaction conversion) along the vertical hydrofluorination zone through a period of time.…”

Review of fluid‐solid reaction analysis—Part 2: Single porous reactant solid

“…The example of the application of Sohn's law by Patisson et al and Dussoubs et al is noteworthy in that the law was found to have many advantages over other models when simulating a complex reaction system in a multiparticle moving bed furnace. Selected examples of the application of Sohn's law are shown below.…”