Modeling of unmixed combustion based packed bed reactor system for heat transfer applications

Krishnaswamy, Srinivas; Deshpande, Amol; Ponnani, Krishnaswamy

doi:10.1016/j.ces.2017.12.010

Cited by 7 publications

(15 citation statements)

References 28 publications

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“…For the modeling of the packed bed section, assumptions and the governing equations considered are similar to those used in the literature discussed above. 29 The particles were assumed to have a uniform temperature. Some studies have stated that depending on the particle size and oxygen carrier, an internal temperature gradient within the particle can occur and cause agglomeration issues.…”

Section: Methodsmentioning

confidence: 99%

“…29 The modeling equations and corresponding boundary conditions for the packed bed sections are similar to the ones used in the existing literature. 29 However, for the fluid flow part of the model of the water section, a laminar flow has been assumed for a reference case, and the corresponding modeling equations (viz. continuity and Navier Stokes equation) were used with Dirichlet boundary conditions.…”

Section: Methodsmentioning

confidence: 99%

“…The PARDISO solver was incorporated and convergence was based on Newton Raphson's iterative method. A representative case was considered using the parameters given in the literature 29 (for the bed section) and Table 1 (for the water section). The above models were then simulated and the theoretical mass and energy balance calculations were carried out using these CFD simulation results.…”

Section: Methodsmentioning

confidence: 99%

“…respect to C O2 was considered as 1 (i.e., n = 1) 29 and actual concentration (at corresponding time and location) was used to determine the rate. The rate constant (k) was determined using the Arrhenius equation.…”

Section: Packed Bed Sectionmentioning

confidence: 99%

“…They also developed a mathematical model of the system discussed above to predict the concentration and temperature profiles in the bed and the velocity and temperature profiles in the coolant air section. 29 The model implementation and simulation were carried out using the CFD software COMSOL Multiphysics TM and the model results were also validated with the corresponding experimental data. Thus, the application of UMC for sustained heat transfer to coolant air was successfully demonstrated.…”

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confidence: 99%

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Design of a packed bed chemical looping (unmixed) combustion reactor for the application of heating liquid: A theoretical study

Faizal

Deshpande

2023

Greenhouse Gases

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A packed bed reactor (PBR)‐based chemical looping combustion (CLC), also referred to as unmixed combustion (UMC), was reported as an alternative to fire in the literature. In this process, the oxygen carriers undergo oxidation and reduction reactions in alternate cycles using air and fuel as the reactive gases, respectively. The energy generated in these reactions can radially be transferred for applications like heating air which was successfully demonstrated. The results showed that 85–95% of the generated energy can radially be transferred while maintaining sustained combustion in the bed (at temperatures between 723 and 1173 K). While extending its application for heating liquids like water, it was found in the modeling and simulation study that the existing design resulted in quenching of the bed below 773 K in the oxidation cycle and achieving sustained combustion was not possible for all practical ranges of operating parameters. Hence it was decided to modify the existing system by increasing the volume ratio of the annular bed to the liquid section. Theoretical estimations revealed that increasing this ratio by four times or higher can result in maintaining sustained combustion conditions in the bed while having continuous radial heat transfer to the water flowing in the laminar range. The general guidelines for designing a UMC‐based liquid heating system were then prepared and used to propose a new design for water heating. The modeling and simulation studies for this proposed design also indicated that it is a feasible design. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Packed Bed Sectionmentioning

confidence: 99%

mentioning

confidence: 99%

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