Simulation studies on direct ash recycling and reburning technology in a tangentially fired 500MW pulverized coal boiler

Hwang, Min-Young; Kim, Seung-mo; Kim, Gyu-bo; Lee, Byoung-Hwa; Song, Juhun; Park, Myung-suk; Jeon, Chung-Hwan

doi:10.1016/j.fuel.2013.05.087

Cited by 31 publications

(14 citation statements)

References 16 publications

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“…Numerical simulation is a powerful tool for understanding such phenomena in each furnace with a different design. Recently, numerical simulations of pulverized coal combustion field in large-scale furnaces have been conducted by various research groups [1][2][3][4][5][6][7][8][9]. For numerical simulations of pulverized coal combustion, simplified models are generally employed because of the limitation of computational resources.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis on effect of furnace scale on heat transfer mechanism of coal particles in pulverized coal combustion field

Hashimoto

Watanabe

2016

Fuel Processing Technology

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To investigate the effect of the furnace scale on the heat transfer mechanism of coal particles, numerical simulations of coal combustion fields in three different scale furnaces (915 MW th actual large scale boiler, 2.4 MW th and 0.76 MW th test furnaces) were conducted. High accuracy of simulation methods was validated with the measured data. From the comparison of numerical simulations between three different scale furnaces, it was clarified that the particle residence time with high particle temperature for a small scale furnace is shorter than that for a large scale furnace even if the particle residence time passing the high temperature gas is the same. This is caused by the insufficient heat gain of particles for a small scale furnace due to the lower radiation heat transfer because of the thinner flame thickness in the small furnace. The sphericity of ash particles from small scale furnaces is lower than that for large scale furnaces due to the shorter particle residence time with high particle temperature. These findings should be considered when the usability of coal brands for actual large scale boilers is evaluated by the fly ash properties from a small scale experimental furnace.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis on effect of furnace scale on heat transfer mechanism of coal particles in pulverized coal combustion field

Hashimoto

Watanabe

2016

Fuel Processing Technology

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“…In Hwang et al [5], technology for recycling ash to the combustion chamber in a 500 MW pulverized boiler to reduce loss of ignition (LOI) was proposed. Numerical tests were done to pick out the best place for the recurrent ash application and its quantity in order to minimize its negative impact on the boiler condition.…”

Section: Introductionmentioning

confidence: 99%

Numerical Research of the Modification of the Combustion System in the OP 650 Boiler

Hernik

2020

Energies

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Changes in the combustion system are one of the paths leading to improved combustion quality. This is manifested by a reduction of the unburnt carbon in fly ash and slag and a reduction in harmful emissions. The article presents the numerical analysis of the modification of the combustion system in the OP 650 boiler. The modifications consisted of changing the direction of swirl of the dust–air mixture in individual burners and changing the distribution of air to Over-Fire Air (OFA) nozzles. These had an impact on NOx and CO emissions and the temperature achieved at the outlet of the chamber. The content of O2, CO, and NOx emissions, flue gas temperature at the outlet from the chamber, flue gas temperature after the platen superheater, as well as temperature at the outlet from the model were presented. The percentage of coal flow directed towards the slag hopper was also noted.

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“…Numerical simulations of pulverized coal combustion fields are useful to archive such understanding [e.g., . Recently, numerical simulations of actual large-scale boilers have been conducted by some researchers [e.g., [7][8][9][10]. Numerical simulations for predicting NOx formation characteristics in coal combustion fields have also been conducted [e.g., [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Effect of different fuel NO models on the prediction of NO formation/reduction characteristics in a pulverized coal combustion field

Hashimoto

Watanabe

Kurose

et al. 2017

Energy

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To investigate the effects of fuel NO formation models on the prediction of NO concentrations in a coal combustion field, numerical simulations for a coal combustion field in a 760 kW test furnace were performed. Three models, those proposed by De Soete, Chen et al. and Mitchell et al. were employed to calculate fuel NO formation originating from volatile matter. The results show that the model proposed by Mitchell et al. reproduces the tendency of the experimental data better than the other two models. In addition, the difference between the NO conversion ratios of bituminous coal and sub-bituminous coal that contains a high level of moisture was examined in detail using simulation results from the model of Mitchell et al. It was found that the formation of a region with a low oxygen mole fraction immediately downstream of a region with a high NO production rate is essential to realize a low NO conversion ratio.

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Simulation studies on direct ash recycling and reburning technology in a tangentially fired 500MW pulverized coal boiler

Cited by 31 publications

References 16 publications

Numerical analysis on effect of furnace scale on heat transfer mechanism of coal particles in pulverized coal combustion field

Numerical analysis on effect of furnace scale on heat transfer mechanism of coal particles in pulverized coal combustion field

Numerical Research of the Modification of the Combustion System in the OP 650 Boiler

Effect of different fuel NO models on the prediction of NO formation/reduction characteristics in a pulverized coal combustion field

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