Investigation of particle radiation and its effect on NO prediction in a pilot-scale facility for both air and oxy-coal combustion

Huynh, H N; Clements, Alastair; Szuhánszki, János; Gale, William F.; Ma, Lin; Ingham, D.B.; Pourkashanian, Mohamed

doi:10.1016/j.fuel.2019.03.121

Cited by 5 publications

(3 citation statements)

References 56 publications

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“…In addition, their simulations showed that RHT is the dominant mode of heat transfer in these flames and radiation from the participating gases contributes for 75% of the total RHT. Huyun et al [245] modelled a 250 kW pilot scale combustion test facility (CTF) by using FLUENT. Simulations considered, on the one hand, a reference radiative model involving the non-grey WSGG coupled to Planck-mean radiative properties for the particles derived from Mie theory and, on the other hand, simplified radiative models based on grey formulations of the WSGG and simple constant or linear radiative properties for the particles.…”

Section: Coal Combustionmentioning

confidence: 99%

The impact of radiative heat transfer in combustion processes and its modeling – with a focus on turbulent flames

Liu

Consalvi

Coelho

et al. 2020

Fuel

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Radiative heat transfer (RHT) is often the dominant mode of heat transfer in flames, fires, and combustion systems and affects significantly temperature distributions directly and kinetically controlled chemical processes indirectly. Modeling RHT accurately in multidimensional flames and combustion systems is challenging mainly due to the highly spectral dependence of radiative properties of combustion products, the high computational cost of solving the radiative transfer equation (RTE), and the strong turbulence and radiation interactions (TRI). Significant progress has been made in all the three aspects in the last three decades and the state-of-the-art models and methods have been incorporated into CFD practice for modeling fires, turbulent jet flames, and turbulent combustion in combustion systems. In this article, we first discuss the coupling between RHT and combustion and the important role played by RHT in some fundamental flame phenomena. Then we discuss the state-of-the-art radiation models with a focus on RTE solvers, radiative property models and TRI. Next, we review the recent simulations of turbulent combustion systems involving these state-of-the-art radiation models. Finally, we provide concluding remarks and some potential research areas to advance RHT modeling in multiphase reacting flows. Nomenclature, , area normal to directions x, y and z [m 2 ] non-grey stretching factor for WSGG, SLW, and FSK methods absorption cross-section of a soot primary particle [m 2 ] absorption cross-section of a soot aggregate [m 2 ] diameter [m] , , integral over a control angle of the direction cosines relative to x, y and z-axis particle size parameter [-] radiant fraction [-] array of variables defining the absorption coefficient, = { , , , } Ω solid angle [sr] Subscript Fuel direction j spectral line S soot at a given wavenumber Superscript aggregate lth direction (DOM) or lth control angle (FVM) mth direction (DOM) or mth control angle (FVM) primary particle Operators 〈 〉 Reynolds averaged quantity ′ Reynolds fluctuating quantity ̅ filtered (or resolved) quantity ′′ subgrid-scale (or residual) fluctuation Recently, quasi-MC methods [43], [44] were employed to solve RHT problems in 3D participating media, aimed at the improvement of the convergence rate, and therefore the computational efficiency. In these methods, the random numbers are replaced by low-

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Section: Coal Combustionmentioning

confidence: 99%

The impact of radiative heat transfer in combustion processes and its modeling – with a focus on turbulent flames

Liu

Consalvi

Coelho

et al. 2020

Fuel

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“…Syngas produced from the gasifier is further burned in the oxy-fuel combustion chamber for power generation, and the flue gas emitted is processed for CO2 capturing by cooling. A numerical investigation on radiation and gas property of the particles in order to predict the formation of NOx pollutants in pulverised coal was carried out (Huynh et al, 2019). Furthermore, gasification process offers more scope for recovering products from waste than incineration.…”

Section: Introductionmentioning

confidence: 99%

Technology for trimming of greenhouse gas in thermal plant system

Green Ibim Abba,

Ugoji Kelechi Uchenna

2023

World J. Adv. Eng. Technol. Sci.

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Industrial expansion depends largely on electric power generation for its operations. These industrial activities have contributed significantly to environmental degradation from frequent emission of large volume of greenhouse gases. Concentration of suspended greenhouse gases in the air of many cities exceed World Health Organization standards and its effect on human health can be devastating. Thus, utmost importance is to generate clean and efficient energy from power plant. The aim of this work is to foster a way of reducing emissions in Power Plants by integrating gasification technologies to the system. Emission data from thermal power plant was analysed with varying gasifier pressure, air-fuel ratio, steam-fuel ratio, and flue gas-fuel ratio. Numerical simulation of the gasification cycle with varying parameters was carried out using MATLAB. The analysis indicated supplementary power generation and cleaner exhaust. The progress of this work can greatly reduce greenhouse emission.

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“…The combustion energy enters the thermodynamic cycle through the boiler to generate power; thus, there is considerable focus on improving the energy conversion efficiency of combustion. On the one hand, radiation represents a large proportion of the combustion system; thus, the effective utilization of radiative energy is of great significance for energy conversion. On the other hand, the optimization and restructuring of the thermodynamic cycle system provide a theoretical basis for efficient energy conversion.…”

Section: Introductionmentioning

confidence: 99%

A novel flame energy grading conversion system: Preliminary experiment and thermodynamic parametric analysis

et al. 2019

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Summary The focus of this study is to improve the efficiency of the thermal power cycle from the perspective of photo energy and thermal energy grading conversion. A new concept of combined radiation and heat engine model was proposed to establish a novel flame energy grading conversion system based on photovoltaic conversion and the Rankine cycle. From the perspective of energy utilization, the spectral radiative energy characteristics in oxy‐coal combustion were experimentally investigated, and a preliminary thermodynamic model of the new system was established based on the experimental results. Finally, energy and exergy analyses were conducted to determine the general characteristics of the proposed system and assess the improvements to the Rankine cycle. The results indicated that temperature was the main factor affecting the short‐waveband energy ratio. Compared with the Rankine cycle, the new flame energy grading conversion system improved the system efficiency by about 3.5%. The exergy analysis indicated that the proposed system reduced the exergy loss factor in the heat transfer of the boiler by about 3% to 6%. This study provides references for improving the thermal power cycle efficiency.

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Investigation of particle radiation and its effect on NO prediction in a pilot-scale facility for both air and oxy-coal combustion

Abstract: Radiation heat transfer plays an important role in pulverised coal combustion, influencing the overall combustion efficiency, pollutant formation and flame ignition and propagation. In this paper, the radiation properties of the

Cited by 5 publications

References 56 publications

The impact of radiative heat transfer in combustion processes and its modeling – with a focus on turbulent flames

The impact of radiative heat transfer in combustion processes and its modeling – with a focus on turbulent flames

Technology for trimming of greenhouse gas in thermal plant system

A novel flame energy grading conversion system: Preliminary experiment and thermodynamic parametric analysis

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