Numerical Study of the Optimization of Combustion and Emission Characteristics of Air-Staged Combustion in a Pulverized Coal-Fired Boiler

Yoon, M.K.; Lee, Byoung-Hwa; Song, Juhun; Kim, Gyu-Bo; Chang, Young-June; Jeon, Chung-Hwan

doi:10.3795/ksme-b.2010.34.6.587

Cited by 1 publication

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“…and Yi et al studied the co-firing characteristics of different coals in the cyclone furnace and put forward some considerations to pave the way for the popularization and application of the cyclone furnace. Related studies have shown that the air-staged technology can decrease NO x emissions during the combustion of pulverized coal, and it has been widely used in boilers. − Huang et al numerically studied the effect of various over-fire air parameters on the combustion and NO x emission characteristics of a 670 t/h boiler. The calculation results were essentially consistent with the actual measured values, which verified the reliability of the numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of NO_x Emission Characteristics of a Cyclone Boiler with Slag-Tap Furnace

Wang

Sun²,

Huang

et al. 2020

ACS Omega

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In order to optimize the parameters of boilers and realize the burning of pure, high-alkali coal, the velocity field, temperature field, and component distribution characteristics of a new cyclone boiler with slag-tap furnace were numerically studied using ANSYS software. The influence law of the over-fire air rate on the NO x emission of the cyclone boiler with slag-tap furnace was established, and the optimal over-fire air rate was determined. The renormalization-group k−ε double equation model was used to simulate the gas phase flow, the discrete phase model was used to compute the gas−solid two-phase flow, and the high-alkali coal combustion model was revised based on experimental data. The results show that the overall aerodynamic field in the entire boiler with slag-tap furnace is favorable, the flue gas is completely formed, and the cyclone burners in a staggered and reversed arrangement can enhance combustion. The temperature near the wall of the cyclone can reach 1700−2100 K, which satisfies the requirements of a liquid slag discharge. The temperature under various over-fire air rate conditions can allow the high-alkali coal to burn normally and ensure fluidization of its ash. The greater the over-fire air rate, the lower the average temperature in the furnace and the lower the NO x concentration at the outlet of the furnace. Considering that it is not easy to fluidize the ash of high-alkali coal when the average temperature in the cyclone boiler with slag-tap furnace is very low, an over-fire air rate of 10% is selected for the optimal air-staged combustion scheme.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of NO_x Emission Characteristics of a Cyclone Boiler with Slag-Tap Furnace

Wang

Sun²,

Huang

et al. 2020

ACS Omega

View full text Add to dashboard Cite

show abstract

Numerical Study of the Optimization of Combustion and Emission Characteristics of Air-Staged Combustion in a Pulverized Coal-Fired Boiler

Cited by 1 publication

References 15 publications

Numerical Simulation of NO_x Emission Characteristics of a Cyclone Boiler with Slag-Tap Furnace

Numerical Simulation of NO_x Emission Characteristics of a Cyclone Boiler with Slag-Tap Furnace

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Numerical Study of the Optimization of Combustion and Emission Characteristics of Air-Staged Combustion in a Pulverized Coal-Fired Boiler

Cited by 1 publication

References 15 publications

Numerical Simulation of NOx Emission Characteristics of a Cyclone Boiler with Slag-Tap Furnace

Numerical Simulation of NOx Emission Characteristics of a Cyclone Boiler with Slag-Tap Furnace

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Numerical Simulation of NO_x Emission Characteristics of a Cyclone Boiler with Slag-Tap Furnace

Numerical Simulation of NO_x Emission Characteristics of a Cyclone Boiler with Slag-Tap Furnace