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Showing 1 to 14 of 14 for “"Entrained-Flow"”.
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Multiscale CFD simulations of entrained flow gasification
The design of entrained flow gasifiers and their operation has largely been an experience based enterprise. Most, if not all, industrial scale gasifiers were designed before it was practical to apply CFD models. Moreover, gasification CFD models developed over the years may have lacked accuracy or …
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Dynamic reduced order modeling of entrained flow gasifiers
… models (ROMs) that predict the operation of entrained flow gasifiers (EFGs) within IGCC (integrated gasification combined cycle) or polygeneration plants are essential for understanding the fundamental processes of importance. Such knowledge can be used to improve gasifier reliability, …
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Comprehensive Modeling and Numerical Investigation of Entrained-Flow Coal Gasifiers
… gasification process inside a generic 2-stage entrainedflow gasifier are carried out using the commercial CFD solver ANSYS/FLUENT. The 3-D Navier-Stokes equations and eight species transport equations are solved with three heterogeneous global reactions, three homogeneous reactions, and one …
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Characterization of Black Liquor Sprays for Application to Entrained-Flow Processes
… characteristics such as mass distribution. Fluid flow rates were measured to allow relevant dimensionless groups for the spray to be calculated. A 1000 degree C tubular furnace was placed around the spray to determine the effect of industrially relevant temperatures on the droplet formation …
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A COMPUTATIONAL STUDY OF DEVOLATILIZATION AND KINETICS IN ENTRAINED FLOW COAL GASIFICATION
… an integral part of the design cycle of modern entrained flow gasifiers. Gasification modeling considers an interacting multi-phase media in a turbulent environment. Several gasification sub-models have been developed and validated over the last thirty five years related to turbulence, gaseous …
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Measurements and Modeling of Coal Ash Deposition in an Entrained-Flow Reactor
Coal plays a significant role in meeting the world's need for energy and will continue to do so for many years to come. Economic, environmental, and public opinion are requiring coal derived energy to be cleaner and operate in a more narrow window of operating conditions. Fouling and slagging of …
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Experimental and Modeling Investigations of Biomass Particle Combustion
… provides a comprehensive analysis of entrained-flow biomass combustion processes. Experimental and theoretical investigations indicate how particle shape and size influence biomass combustion rates. Experimental samples include flake-like, cylinder-like, and equant (nearly spherical) …
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Computational Scheme Guided Design of a Hybrid Mild Gasifier
… determine the appropriate draft tube dimensions, entrained flow residence time, The simulations also help determine the appropriate operating fluidization velocity range to sustain the fluidized bed depth without depleting the chars or blowing the char away. The results are informative, but …
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Biomass characterization and reduced order modeling of mixed-feedstock gasification
… modeling. An existing coal Entrained Flow Gasification (EFG) Reduced Order Model (ROM) was expanded to more accurately simulate the gasification of a mixed feedstock of biomass and coal. The GE 2700tpd gasifier was used because it is a widely used technology. The …
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Simulation of Coal Gasification Process Inside a Two-Stage Gasifier
… gasification process inside a generic two-stage entrained-flow gasifier to produce syngas carbon monoxide and hydrogen. The simulations are conducted using the commercial Computational Fluid Dynamics (CFD) solver FLUENT. The 3-D Navier-Stokes equations and seven species transport equations are …
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Computational Fluid Dynamics (cfd) Modeling of a Laboratory Scale Coal Gasifier
… of coal gasification in a laboratory scale entrained-flow coal gasifier. The mesh for the model was developed with ICEM CFD software and the chemical and physical phenomena were modeled using the fluid flow solver ANSYS FLUENT. Mesh independence was verified. The model was validated with …
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The Phase Inversion-based Coal-CO₂ Slurry (PHICCOS) feeding system : design, coupled multiscale analysis, and technoeconomic assessment
… processes. Plants based on pressurized, entrained-flow gasifiers (EFG) are a good example. EFGs are used to produce synthetic gas for the production of synthetic transportation fuels, chemicals, and for generating electricity in Integrated Gasification Combined Cycle (IGCC) power plants. …
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Investigation of high-temperature and high-pressure steam gasification kinetics of a coal-derived char surrogate
… (i.e., conditions that are applicable to entrained-flow gasification). The feedstock used in this study was a char ``surrogate'' (a coal-derived activated carbon) which was thoroughly characterized to provide data regarding its composition, physical structure, and reactivity. Activated …
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Flash calcination of limestone in a bench-scale sorbent activation process (SAP) unit
… 6, 451, 094 and 6,558,454). SAP utilizes an entrained-flow reactor in which sorbent (AC or quicklime) particles are subjected to a < 5 second residence time during their production. On-site production of quicklime could help lower the production cost of quicklime sorbent for dry sorbent …