5 research outputs found
CFD modeling of the catalyst oil slurry hydrodynamics in a high pressure and temperature as potential for biomass liquefaction
The paper presents the simulation of a catalyst-para n oil slurry hydrodynamics under
high pressure and temperature in a convex bottom reactor with a Rushton turbine which was
conducted with an application of computational fluid dynamics (CFD) modeling. An analysis to
obtain a uniform distribution of solid catalyst particles suspended in para n oil was carried out as a
potential for biomass liquefaction. The e ects of the particle diameter, bed density, liquid viscosity,
and the initial solid loading on slurry hydrodynamics in high pressure and temperature behavior
were investigated using the Eulerian–Eulerian two-fluid model and the standard k-" turbulence
model. The main objective was to assess the performance in agitating highly concentrated slurries to
obtain slurry velocity, concentration, the degree of homogeneity, and to examine their e ect on the
mixing quality. The results of the analysis are applied to predicting the impact of the most e cient
conditions on slurry suspension qualities as potential for biomass liquefaction
CFD numerical modelling of a PV–TEG hybrid system cooled by air heat sink coupled with a single-phase inverter
This study presents full transient, three-dimensional numerical models of a PV–TEG hybrid
module coupled with single-phase inverter by co-simulation. The influence of factors, such as wind
speed, solar radiation intensity, or ambient temperature on the PV–TEG system, was also examined.
The numerical model was implemented using Ansys software which accounted the phenomena
of Thomson, Seebeck, and Joule’s heat place on the TEG system. Furthermore, its impact on total
electrical efficiency was studied. The heat transfer surface of the passive heat sink and forced air
circulation positively affected the total heat transfer, and therefore helped to maintain the electrical
efficiency at a higher level. Simulation of the single-phase inverter with a PV–TEG system allows
the determination of the power characteristics of the system in real time. The results of the study
presented may provide a basis for performance optimization of a practical PV–TEG-inverter hybrid
system co-design
MODELLING AND CONTROL OF CONTINUOUS STIRRED TANK REACTOR WITH PID CONTROLLER
This paper presents a model of dynamics control for continuous stirred tank reactor (CSTR) in methanol synthesis in a three-phase system. The reactor simulation was carried out for steady and transient state. Efficiency ratio to achieve maximum performance of the product per reactor unit volume was calculated. Reactor dynamics simulation in closed loop allowed to received data for tuning PID controller (proportional-integral-derivative). The results of the regulation process allow to receive data for optimum reactor production capacity, along with local hot spots eliminations or temperature runaway
Modelling of Carbon Monoxide and Carbon Dioxide Methanation under Industrial Condition
The development of methanation technology is supported by detailed modeling and process simulation to optimize the design and study of its reaction dynamic properties. The chapter presents a discussion of selected catalysts and its kinetic models in the methanation reaction. The development models of fixed-bed reactors in the methane synthesis were also presented. Chemical and physical modeling of methanation reactions with optimization, exploitation, and the analysis of critical processes in time is an important contribution to the technology modernization
Bio-Hydrogen Production in Packed Bed Continuous Plug Flow Reactor—CFD-Multiphase Modelling
This research study investigates the modelling and simulation of biomass anaerobic dark fermentation in bio-hydrogen production in a continuous plug flow reactor. A CFD multiphase full transient model in long-term horizons was adopted to model dark fermentation biohydrogen production in continuous mode. Both the continuous discharge of biomass, which prevents the accumulation of solid parts, and the recirculation of the liquid phase ensure constant access to the nutrient solution. The effect of the hydraulic retention time (HRT), pH and the feed rate on the bio-hydrogen yield and production rates were examined in the simulation stage. Metabolite proportions (VFA: acetic, propionic, butyric) constitute important parameters influencing the bio-hydrogen production efficiency. The model of substrate inhibition on bio-hydrogen production from glucose by attached cells of the microorganism T. neapolitana applied to the modelling of the kinetics of bio-hydrogen production was used. The modelling and simulation of a continuous plug flow (bio)reactor in biohydrogen production is an important part of the process design, modelling and optimization of the biological H2 production pathway