Hydrodynamics Modelling and Catalytic Reactions of Multiphase Reactors at Extreme Conditions
|RESEARCH GROUP MEMBERS|
|Supervisor & ResearcherPost-docs:|
|JAMAL CHAOUKI||SHERIF FARAG||JABER SHABANIAN||AMIN ESMAEILI|
|EL MAHDI LAKHDISSI||NAVID ELAHIPANAH||REMI DEMOL|
Owing to the shortage of traditional resources and stringent environmental constraints, the feedstocks of several industrial processes are rapidly changing. The intrinsic variability of the feedstocks combined with social needs make many industrial processes much more difficult to design and operate. Scrutinizing the hydrodynamics and catalytic reactions of multiphase processes under conditions applicable to a broad range of technologies would lead at providing valuable insights into how the variation of operating condition can modify the reactor’s hydrodynamics and, in turn, its performance. The knowledge achieved from these studies, consequently, will help in the development of new processes and/or in the improvement of the existing ones to be aligned with the current and future needs.
In this regard, a research project includes three integrated research themes (turbulent fluidized beds reactor, slurry bubble column reactor, and catalytic reactions of multiphase reactors) have been tailored to the industrial needs. The industrial partner of this research project is TOTAL American Services, Inc. Two pilot-scale reactors have been built to carry out the experimental work (1) a gas-solid fluidized bed (I.D.=15 cm, H=4 m, P=0.1 to 3 MPa, T=20 °C to 1190 °C), and (2) a slurry bubble column (I.D.=15 cm, H=4 m, P=0.1 to 3 M Pa, T=20°C to 250°C).
PEARL’S RELATED PROJECTS
- Indirect Measurement of Inter-Particle Forces in a Gas-Solid Fluidized Bed at High Temperature with a Simple Approach; Navid Elahipanah
- Hydrodynamics of bubble column reactors operating with non-Newtonian liquids at high-pressure and high-temperature conditions; Amin Esmaeili
- Development of a multiscale model for the simulation of mass transfer in gas/liquid bubble columns; Remi Demol
|Gas-solid fluidized beds are widely adapted in chemical processes operated at moderate to high pressure and temperature. The hydrodynamics of fluidized beds at elevated pressures and temperatures directly affects the transfer phenomena and reaction rates in the bed and, hence, is a critical factor for their design and operation. Nevertheless, the present understanding is far from satisfactory due to the lack of insight about the relative importance of interparticle forces and hydrodynamic forces. Attention to the fluidization characteristics of high pressure and temperature gas-solid fluidized bed reactors is essential since they will find many additional applications in the near future that will coincide with the rarefaction of conventional resources. The objective of the present study is to explore the fluidization behavior of different particles, covering Geldart groups A, B, and D powders, referred to the fluidization behavior at ambient conditions, at different operating conditions. The operating pressure and temperature will vary in the range of 1–20 bar and 25–900oC, respectively. The fluidization study will be attempted at different superficial gas velocities covering the fixed bed state, bubbling, and turbulent fluidization regimes. Different reliable and accurate measurement techniques/approaches, i.e., pressure transducers, an optical fiber probe, and the gas residence time distribution measurement, will be employed for the purpose of a comprehensive hydrodynamic study from both global and local points of view.|
|Although different types of reactors are used as multiphase contactors, the bubble column reactors received much attention from both academic and industrial interests during the past decade. The bubble column reactors offer high rates of heat and mass transfer, less maintenance cost, and feasibility for large production capacity.
The design and scale-up of a bubble column reactor needs a complete understanding of its complex hydrodynamic behaviour, which is influenced by the physical properties of the phases, the operating variables and the design parameters. In recent years, viscous liquids (Newtonian and non-Newtonian) are being used for carrying out chemical reaction in bubble column reactors in many processes at HP and HT conditions.
Although there has been an increasing interest in using non-Newtonian liquids in bubble column reactors, knowledge of the effects of the non-Newtonian flow behaviour on the hydrodynamics of bubble columns is limited and extensive studies are still needed to elucidate the influence of these liquids on the performance of bubble columns.
To fulfill this essential need, the effects of different non-Newtonian liquids on the hydrodynamics of bubble columns is being investigated in two pilot-scale bubble column reactors with different geometries operating in both ambient and HP-HT conditions under the framework of the TOTAL research chair on multiphase reactors operating at extreme conditions.