Coupling detailed radiation model with process simulation in Aspen Plus: A case study on fluidized bed combustor

Hu, Yukun; Wang, Jihong; Tan, Chee-Keong; Liu, Hao

doi:10.1016/j.apenergy.2017.08.030

Cited by 19 publications

(5 citation statements)

References 36 publications

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“…Consequently, Matthew et al [47] developed a more flexible version called REFORM, which had removed such restrictions in RADEX. Hu et al [8] further improved the computational efficiency of the REFORM program using parallel computing algorithms [48], employing this in their more recent work [49].…”

Section: Radiation Exchange Area Calculationmentioning

confidence: 99%

Modelling and simulation of steel reheating processes under oxy-fuel combustion conditions – Technical and environmental perspectives

Tan

Niska

et al. 2019

Energy

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This paper investigates the impact of flameless oxy-fuel combustion on the thermal performance of a pilot-scale steel reheating furnace. A comprehensive mathematical model, based on the zone method of radiation analysis, was developed, which takes into account the non-grey behaviour of the furnace atmosphere under oxy-fuel combustion conditions. The model was subsequently used to simulate the temperature profile of an instrumented slab used in the experiment. The results showed that the predicted slab temperature profile along the furnace is in good agreement with measurement. However the model over predicted the absolute slab temperatures due to the influence of formation of oxide scales on the slab surface, which was not taken into account in the current model. When compared to air-fuel combustion simulation, the results of oxy-fuel combustion also indicated a marked improvement in the furnace specific fuel consumption (approximately 16%). This was mainly due to the enhanced radiative properties of the furnace atmosphere and reduced exhaust energy losses as the result of less dilution effect from nitrogen. This resulted in reduction in the overall heating time by approximately 14 minutes. Furthermore, if the economics of carbon capture is taken into consideration, theoretically, the energy consumption per kilogram of CO 2 captured can be reduced from 3.5-4.2 MJ kg-1 to 0.96 MJ kg-1. In conclusion, the current studies support the view that oxy-fuel combustion retrofitting to reheating furnaces is a promising option, both from a technical and from an environmental point of view.

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Section: Radiation Exchange Area Calculationmentioning

confidence: 99%

Modelling and simulation of steel reheating processes under oxy-fuel combustion conditions – Technical and environmental perspectives

Tan

Niska

et al. 2019

Energy

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“…CFB technology has been widely used for combustion of solid fuel. It has several advantages, such as fuel flexibility, high combustion intensity, and low emissions [38]. In most gas particle combustion systems, particle radiation is significant and should be carefully modeled [39,40,41,42].…”

Section: Application To a Combustion Systemmentioning

confidence: 99%

Improved banded method for spectral thermal radiation in participating media with spectrally dependent wall emittance

2019

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To develop an efficient and practical spectral radiation model for CFD simulations, a banded approach is proposed for a mixture of carbon dioxide and water vapor in varying thermodynamic states. Using a previously reported band dividing scheme, a statistical narrow band model is implemented to provide gray band absorption coefficient databases. The databases were then approximated by certain simple correlations, which can be readily used in CFD calculations of RTE solvers. The correlations were validated in several 1D and 3D benchmarks representing various combustion conditions. The accuracy and CPU cost of the proposed banded approach were studied and compared with those of other similar methods. The results demonstrated that the new approach is an efficient and accurate method that can be conveniently applied in a commercial CFD code for spectral radiation; moreover, it can handle non-gray walls. As a practical case study, the proposed approach was used to simulate radiative heat transfer within a back pass channel of a CFB boiler. The effect of combustion scenarios, i.e., air-and oxygen-fired, boiler load, inlet flow conditions, and wall material, was analyzed by the CFD model. The predictions of two different RTE solvers, i.e., P1 and DO, and the required CPU time were compared for gray and non-gray models.

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“…The process flowsheet designed (see Figure 3) can be used to calculate mass and energy balances, emissions, and the chemical compositions of products and by-products simultaneously. The previous work of Hu et al [7] had described the implementation of Aspen Plus reactor modules for fluidized bed modelling in detail which will not to be repeated here. It should be noted that the reaction kinetics were necessarily updated to accommodate the gasification processes such as pyrolysis, volatile matter combustion, and bio-char steam gasification in this study [6].…”

Section: Model Developmentmentioning

confidence: 99%

Feasibility Study of Biomass Gasification Integrated with Reheating Furnaces in Steelmaking Process

Hu¹,

Chowdhury²,

Katsaros³

et al. 2019

dteees

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This paper investigates the integration of biosyngas production, reheating furnace and heat recovery steam cycle, in order to use biosyngas directly as fuel in the furnace. A system model was developed to evaluate the feasibility of the proposed system from the perspective of heat and mass balance. To particularly study the impacts of fuel switching on the heating quality of the furnace, a three-dimensional furnace model considering detailed heat transfer processes was embedded into the system through an Aspen Plus TM user defined model. The simulation results show that biosyngas is suitable for direct use as fuel for reheating furnaces. Should CO capture be considered in the proposed system, it has a potential to achieve the capture without external energy input which results in so-called negative emissions of CO .

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Coupling detailed radiation model with process simulation in Aspen Plus: A case study on fluidized bed combustor

Cited by 19 publications

References 36 publications

Modelling and simulation of steel reheating processes under oxy-fuel combustion conditions – Technical and environmental perspectives

Modelling and simulation of steel reheating processes under oxy-fuel combustion conditions – Technical and environmental perspectives

Improved banded method for spectral thermal radiation in participating media with spectrally dependent wall emittance

Feasibility Study of Biomass Gasification Integrated with Reheating Furnaces in Steelmaking Process

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