Computational fluid dynamics simulation for chemical looping combustion of coal in a dual circulation fluidized bed

Su, Mingze; Zhao, Haibo; Ma, Jinchen

doi:10.1016/j.enconman.2015.07.042

Cited by 76 publications

(31 citation statements)

References 45 publications

(41 reference statements)

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“…A strategy to prevent char particles from reaching the air reactor could consist of raising the residence time of these type of particles inside the fuel reactor. Su et al [22] observed that this could be achieved through a reduction in the gas velocity at the bottom part of the fuel reactor. However, this action would entail a decrease in the solids circulation rate between the air and fuel reactors [23], which would affect the amount of oxygen available in the fuel reactor.…”

Section: Chemical Looping Combustion Of Coal Via In-situ Gasificationmentioning

confidence: 99%

Chemical Looping Combustion of gaseous and solid fuels with manganese-iron mixed oxide as oxygen carrier

Pérez-Vega

Abad

Gayán

et al. 2018

Energy Conversion and Management

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Synthetic manganese-iron mixed oxides are considered promising materials to be used as oxygen carriers for Chemical Looping Combustion of coal with carbon dioxide capture at low cost. The aim of this work was to evaluate a manganese-iron mixed oxide material with a manganese to iron molar ratio of 0.77:0.23 as oxygen carrier for coal combustion by means of chemical looping processes, including both ex-situ and in-situ gasification of coal. The preparation method-spray drying followed by calcination-was optimized in order to produce particles with high reactivity and mechanical strength. The material was studied in two continuously operated facilities designed to burn either gaseous or solid fuels. While full combustion was achieved burning syngas, showing the feasibility of the use of this material considering the ex-situ gasification process. Coal combustion efficiency by in-situ gasification process was improved in comparison with other previously tested low-cost materials such as ilmenite and iron ore. Moreover, the oxygen carrier particles showed an interesting magnetic behavior that was able to facilitate oxygen carrier recovery from the

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Section: Chemical Looping Combustion Of Coal Via In-situ Gasificationmentioning

confidence: 99%

Chemical Looping Combustion of gaseous and solid fuels with manganese-iron mixed oxide as oxygen carrier

Pérez-Vega

Abad

Gayán

et al. 2018

Energy Conversion and Management

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“…However, the continuous charging was not viable for their model. Su et al [58] performed a two-dimensional simulation of a dual circulation fluidized bed (DCFB) iG-CLC system. They investigated the gas leakage behaviors, flow characteristics and combustion performance in the reaction process with coal as fuel.…”

Section: Of 17mentioning

confidence: 99%

Numerical Investigation of Solid-Fueled Chemical Looping Combustion Process Utilizing Char for Carbon Capture

et al. 2019

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The in-depth understanding of the gas–solid flow and reaction behaviors, and their coupling characteristics during the chemical looping combustion (CLC) process has the guiding significance for the operation and optimization of a chemical looping combustor. A three-dimensional numerical model is applied to investigate the char-fueled CLC characteristics in a fuel reactor for efficient CO2 separation and capture. Simulations are carried out in a bubbling fluidized bed fuel reactor with a height of 2.0 m and a diameter of 0.22 m. The initial bed height is 1.1 m, and hence the height–diameter ratio of the slumped bed is five. The oxygen carrier is prepared with 14 wt% of CuO on 86 wt% of inert Al2O3. In the process of mathematical modeling, a Eulerian-Eulerian two-fluid model is adopted for both of the gas and solid phases. Gas turbulence is modeled on the basis of a k–ε turbulent model. The reaction kinetics parameters are addressed based upon previous experimental investigations from literature. During the simulation, the gas–solid flow patterns, composition distributions, and reaction characteristics are obtained. Moreover, the effects of solids inventory and fluidizing number on the reaction performance are elucidated in-depth. The results have shown that the reaction rates have close relationship with the flow patterns and the distributions of gas concentrations. Compared to the steam-char gasification over sand, the application of char-fueled CLC can effectively promote the conversion of gasification products. In addition, higher CO2 concentration at the outlet can be achieved by increasing the initial solids inventory or decreasing the fluidizing number. Some calculated values are verified by the previous data, indicating that the current three-dimensional models are reasonable to study the process mechanism of char-fueled CLC.

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“…These works on DCFB were con ducted using an Euler Euler approach on fueled gas systems. Another example is the study of Su et al (2015) who performed two dimensional numerical simulations of a DCFB CLC using coal as fuel. On the other hand, a small number of studies based on a three dimensional model of a DCFB CLC unit may be found in the lit erature.…”

Section: Introductionmentioning

confidence: 99%

Unsteady three-dimensional theoretical model and numerical simulation of a 120-kW chemical looping combustion pilot plant

Hamidouche

Masi

Fede

et al. 2019

Chemical Engineering Science

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Computational fluid dynamics simulation for chemical looping combustion of coal in a dual circulation fluidized bed

Cited by 76 publications

References 45 publications

Chemical Looping Combustion of gaseous and solid fuels with manganese-iron mixed oxide as oxygen carrier

Chemical Looping Combustion of gaseous and solid fuels with manganese-iron mixed oxide as oxygen carrier

Numerical Investigation of Solid-Fueled Chemical Looping Combustion Process Utilizing Char for Carbon Capture

Unsteady three-dimensional theoretical model and numerical simulation of a 120-kW chemical looping combustion pilot plant

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