CFD modeling of riser with Group B particles

Rodrigues, S. Sofia M.; Forret, Ann; Montjovet, Florian; Lance, Michel; Gauthier, Thierry

doi:10.1016/j.powtec.2015.05.020

Cited by 11 publications

(10 citation statements)

References 27 publications

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“…Because of the high cost of experimental research, a large number of researchers have studied gas-solids flow in a circulating fluidized bed by numerical simulation [5][6][7][8]. To optimize the products of the reactor, both excellent design and reasonable operation of the CFB, which are closely related to the gas-solids distribution, solids back-mixing, and residence time distribution, are critical.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Riser-Simplified, Riser-Only, and Full-Loop Simulations for a Circulating Fluidized Bed

Wang

Shi

et al. 2019

Processes

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With the development of computing power, the simulation of circulating fluidized bed (CFB) has developed from riser-simplified simulation to riser-only simulation, then to full-loop simulation. This paper compared these three methods based on pilot-scale CFB experiment data to find the scope of application of each method. All these simulations, using the Eulerian–Eulerian two-fluid model with the kinetic theory of granular theory, were conducted to simulate a pilot-scale CFB. The hydrodynamics, such as pressure balance, solids holdup distribution, solids velocity distribution, and instantaneous mass flow rates in the riser or CFB system, were investigated in different simulations. By comparing the results from different methods, it was found that riser-simplified simulation is not sufficient to obtain accurate hydrodynamics, especially in higher solids circulating rates. The riser-only simulation is able to make a reasonable prediction of time-averaged behaviors of gas–solids in most parts of riser but the entrance region. Further, the full-loop simulation can not only predict precise results, but also obtain comprehensive details and instantaneous information in the CFB system.

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Section: Introductionmentioning

confidence: 99%

“…Because of the high cost of experimental research, a large number of researchers have studied gas-solids flow in a circulating fluidized bed by numerical simulation [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Riser-Simplified, Riser-Only, and Full-Loop Simulations for a Circulating Fluidized Bed

Wang

Shi

et al. 2019

Processes

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“…However, the impact of sphericity that we found is strong and unexpected. It cannot be predicted by the classic riser models nor CFD [95]. Therefore, we developed a 1D model at IFPEN using these experiments to derive a 1D drag force, and accounting for particle properties in order to predict riser hydrodynamics in CLC conditions (see Fig.16).…”

Section: Fluidized Regimes In Clc Processmentioning

confidence: 99%

“…Axial pressure profiles along the riser for sand and glass beads (GB) at different operating conditions [94]. Experimental and 1D model prediction of axial pressure profiles along the riser with glass beads[95] …”

mentioning

confidence: 99%

CLC, a promising concept with challenging development issues

et al. 2017

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Chemical Looping Combustion (CLC) is a promising technique to achieve fuel combustion in a nitrogen free atmosphere, therefore giving the possibility to separate and store or use CO 2. Several potential applications are considered in the field of power generation with gas, liquid and mostly solid fuels. In the Carbon Capture, Storage and Utilization (CCSU) context, energy penalty is reduced with CLC compared to other routes. In addition, other applications of Chemical Looping Technology are considered in the field of H 2 production or gasification for instance. In the past years, a huge effort has been conducted worldwide to investigate CLC materials and process issues. In 2008, IFPEN and Total have started an ambitious collaboration to develop CLC applications. Nowadays, the CLC concept is well demonstrated on the pilot scale. The next step is to demonstrate the technology over time on a larger scale. For further developments, some challenges should be addressed, both on market and technical aspects: • Short term market is limited. Uncertainties around CO 2 emission market (i.e. carbon credits) and storage issues are hindering policy and public acceptance and still must evolve in the right direction, • Financing of demonstration units for carbon capture in this context is challenging and other applications of CLC may require to be investigated such as utilization of captured CO2 for EOR purpose. • The industrial use of synthetic metal oxides or natural ores at large scale generates a lot of issues related to availability, price, waste disposal, health and safety, additionally to chemical and mechanical aging, reactivity, and oxygen transfer capacity, • Chemical looping reactor and process technology concepts have to be explored, developed, modeled and scaled-up in order to ensure adequate power production together with good gas solid contact and reaction requirement, controlled circulation of mixtures of particle (oxygen carrier, ash, solid fuel for instance). All these points should be considered on very large scales for carbon capture and storage (CCS) applications in order to minimize energy penalty and cost in severe operating conditions (temperatures above 800°C and intense so lid circulation). Technical challenges remain to be solved and proven with large demonstration over long periods of time. In this context, research in the field of fluidization technology is essential and we will address some key points investigated at IFPEN as related to control of solid circulation, oxygen carrier attrition, conceptual design of CLC reactors and process performance.

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“…Therefore, the gas‐solids flow characteristics of the CFB have long been one of the research priorities in the literature. Due to the high cost of experimental research and limited data obtained, many researchers have studied the gas‐solid flow in a CFB by numerical simulation . Most of the simulations focused on the riser by isolating the riser from the system and setting inlet solids circulating rates G s 1) as a constant.…”

Section: Introductionmentioning

confidence: 99%

Full‐Loop Simulation of Gas‐Solids Flow in a Pilot‐Scale Circulating Fluidized Bed

Wang

Shi

et al. 2019

Chem Eng & Technol

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In order to study the system hydrodynamics in a circulating fluidized bed (CFB), a 3D full‐loop simulation was conducted for a pilot‐scale CFB. The Eulerian‐Eulerian two‐fluid model with the kinetic theory of granular theory helped to simulate the gas‐solids flow in the CFB. The system hydrodynamics including pressure balance, vectors of gas and solids, distribution of solids holdup, and instantaneous circulating rates were obtained to get a comprehensive understanding of the system. It was predicted that the main driving force was the pressure drop of the storage tank. The storage height and valve opening were critical operating factors to control the riser operation. The effects of operating conditions including solids circulating rates and superficial gas velocity on the hydrodynamics were investigated to provide guidance for the stable operation of the CFB system.

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CFD modeling of riser with Group B particles

Cited by 11 publications

References 27 publications

Comparison of Riser-Simplified, Riser-Only, and Full-Loop Simulations for a Circulating Fluidized Bed

Comparison of Riser-Simplified, Riser-Only, and Full-Loop Simulations for a Circulating Fluidized Bed

CLC, a promising concept with challenging development issues

Full‐Loop Simulation of Gas‐Solids Flow in a Pilot‐Scale Circulating Fluidized Bed

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