In recent years finite volume computations of two-fluid hydrodynamic models have been used in a number of numerical investigations of gas-solids fluidized bed and circulating fluidized bed processes. To avoid numerical diffusion from dominating simulation results, proper discretization of convective terms is critical i e higher-order methods should be used in the computation of convective terms...

The aims to reduce harmful emissions are influencing increasingly the modern-day production of energy, while higher objectives are set also for the efficiency of combustion processes. Therefore it is necessary to develop such data analysis and modeling methods that can respond to these demands. This paper presents an overview of how the formation of nitrogen oxides (NOx) in a circulating fluidi...

The hydrodynamic studies of fluidized bed reactor has been reported in terms of pressure drop, minimum fluidization velocity and bed volume expansion to contribute to the optimization of the CNTs production parameters in fluidized bed reactors. Minimum fluidization velocity and pressure drop, as the most important parameters, were taken into account for the investigation of the hydrodynamic beh...

The unknown NOx distributions inside large-scale CFB (circulating fluidized bed) boilers have always hindered the economy of SNCR (selective non-catalytic reduction) process. In this study, field tests were carried out on a typical 300 MW boiler, where multi-level 316 L-made probe and Ecom-J2KN/Testo 350 analyzers used to perform detailed two-dimensional flue gas composition at inlets for first...

High temperature Fischer-Tropsch synthesis process use fixed fluidized bed as a reactor. In order to understand the flow behavior in the fluidized bed better, the research of how the radial velocity affects the entire flow field is necessary. Laser Doppler Velocimetry (LDV) was used to study the radial velocity distribution along the diameter direction of the cross-section of the particle in a ...

Fluidized bed processing is a relatively novel method for coating metal substrates. A detailed study was carried out into surface property and in micro-structure changes induced by fluidized bed processing. In particular, fluidized bed processing of AA 6082 T6 aluminum alloy components using alumina Al2O3 powder was investigated. Firstly, the build up of Al2O3 films was studied and characterize...

Abstract Considering the different particle sizes in circulating fluidized bed boiler furnace, binary-component method is used to analyze flow characteristics furnace. The dynamics principle solve gas-solid two-phase mass equation, momentum equation and turbulence using two-fluid model. model uses more mature design drawings, reproduces of particles obtains shape lower bubbling fast upper bed, ...

There is increasing interest in CO2 looping cycles that involve the repeated calcination and carbonation of the sorbent as a way to capture CO2 from flue gases during the carbonation step and the generation of a pure stream of CO2 in the oxyfired calcination step. In particular, attrition of the material in these interconnected fluidized bed reactors is a problem of general concern. Attrition o...