Applications of CFB technology to gas—solid reactions

Dry, R.J.; Beeby, C.

doi:10.1007/978-94-009-0095-0_12

Cited by 6 publications

(4 citation statements)

References 1 publication

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“…Lee (1997) reports that hundreds of CFB boilers are in operation with a total capacity over 9000 MW and that low combustion temperatures and the introduction of sorbents into the process lead to low emissions. Dry and Beeby (1997) discuss several other uses of CFBs including coal gasification and metal processing. These applications are not used as widely as FCC units or CFB boilers, but their variety is impressive and suggests great potential.…”

Section: Gas-solid Flow Industrial Applicationsmentioning

confidence: 99%

Circulating fluidized bed hydrodynamics experiments for the multiphase fluid dynamics research consortium (MFDRC).

Oelfke¹,

Torczynski²,

O’Hern³

et al. 2006

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An experimental program was conducted to study the multiphase gas-solid flow in a pilot-scale circulating fluidized bed (CFB). This report describes the CFB experimental facility assembled for this program, the diagnostics developed and/or applied to make measurements in the riser section of the CFB, and the data acquired for several different flow conditions. Primary data acquired included pressures around the flow loop and solids loadings at selected locations in the riser. Tomographic techniques using gamma radiation and electrical capacitance were used to determine radial profiles of solids volume fraction in the riser, and axial profiles of the integrated solids volume fraction were produced. Computer Aided Radioactive Particle Tracking was used to measure solids velocities, fluxes, and residence time distributions. In addition, a series of computational fluid dynamics simulations was performed using the commercial code Arenaflow™.

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Section: Gas-solid Flow Industrial Applicationsmentioning

confidence: 99%

Circulating fluidized bed hydrodynamics experiments for the multiphase fluid dynamics research consortium (MFDRC).

Oelfke¹,

Torczynski²,

O’Hern³

et al. 2006

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“…Circulating fluidized beds (CFBs) have been widely used in many processes, such as crude oil conversion and coal combustion. , Based on the instability analysis of the pressure balance in a CFB system, Zhu and Bi proposed the concept of high-density (HD) CFBs in 1993. A HDCFB is generally defined as the CFB with the operations at a larger solid circulation rate ( G s ) than 200 kg/m 2 ·s and a higher overall volumetric solid holdup (ε s ) than 0.10. , The advantages of the HDCFB over a conventional CFB include, for example, high solid flux, good contact between gas and solid phases, low back-mixing, and high reaction efficiency.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Pilot-Scale High-Density Circulating Fluidized Bed Riser

Wang

Lan

Wang

et al. 2021

Ind. Eng. Chem. Res.

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A high-density circulating fluidized bed (HDCFB) has broad prospects in catalytic processes. It can handle higher solid circulation rates than a low-density CFB (LDCFB), leading to more complicated clustering phenomena that are challenging to describe theoretically. This paper presents a two-fluid model facilitated with the kinetic theory to simulate HDCFBs. To improve the predictability of such a model, an existing solid pressure correlation is empirically modified based on experimental data to consider the influences of different clustering behaviors inside the LDCFB and HDCFB. The validity of the model is first verified by comparing the numerical results with the measurements in terms of gas pressure and solid holdup and velocity under various conditions. Then, the effects of superficial gas velocity and solid circulating rate on cluster formation and associated gas−solid flow are studied. The results demonstrate the differences between the LDCFB and HDCFB in cluster size and shape and flow heterogeneity.

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“…After several decades of development, fast fluidization or circulating fluidized bed (CFB) has been applied widely, nowadays, in different industries, such as chemical, metallurgy, and energy engineering [1][2][3]. Thanks to the particle agglomeration in CFB risers, small particles could be fluidized under quite high gas velocity, resulting in very high rates of heat and mass transfers in the bed.…”

Section: Introductionmentioning

confidence: 99%

Introductory Review on an Engineering Approach for Fast‐Bed Modeling in Mimic to Bubbling Bed Practice

Zhang¹,

Zhang²

2018

Thermal Power Plants - New Trends and Recent Developments

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Based on the downward-penetrating particle flow through clusters and the analogy between a falling cluster and a rising bubble identified by the authors, a "type-Achoking-oriented separate-phase-coexistence model" for the upper dilute region of fast beds was established first. Without any model parameter adjustment, the unified model predicted successfully the type C choking, the solids holdup of upper dilute region, and transitions to the high-density fast bed and the dense suspension up-flow.The model was then integrated with the sub-models of "cluster rebound at the dense bottom,"" the momentum flux balances for acceleration and transition zones" in the lower and middle parts of the bed. The integrated model predicted successfully the axial solids holdup distributions of literature data under extremely wide operation conditions covering dilute-phase transportation, the premature fast bed, the classical fast bed, and the high-density fast bed.

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Applications of CFB technology to gas—solid reactions

Cited by 6 publications

References 1 publication

Circulating fluidized bed hydrodynamics experiments for the multiphase fluid dynamics research consortium (MFDRC).

Circulating fluidized bed hydrodynamics experiments for the multiphase fluid dynamics research consortium (MFDRC).

Numerical Simulation of the Pilot-Scale High-Density Circulating Fluidized Bed Riser

Introductory Review on an Engineering Approach for Fast‐Bed Modeling in Mimic to Bubbling Bed Practice

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