In-depth numerical analysis of combustion and NOx emission characteristics in a 125 MWe biomass boiler

Trinh, Viet Thieu; Kim, Seung-Mo; Kim, Kang-Min; Lee, Byoung-Hwa; Jeong, Tae-Yong; Son, Ju-Seong; Kim, Jong-Man; Jeon, Chung-Hwan

doi:10.1016/j.fuel.2022.125961

Cited by 8 publications

(7 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This fluctuation in the char conversion may be owing to the interaction between the air velocity of burners B and C on the particle trajectories from burner A. The particle residence time and trajectory depend on each particle size and separate active burner . The integration of the force balance, such as gravitational, buoyancy, and drag forces, greatly influenced the biomass particle motion.…”

Section: Resultsmentioning

confidence: 99%

“…The biomass particle is generally larger than the coal particle, which considerably influences the char burnout . The properties of the SY sample (raw and char) biomass are used in the biomass boiler, as illustrated in the previous research . The volatile content of the SY biomass at 70.35% is considerably higher than the fixed carbon at 19.52%, with a higher heating value of 19.713 kJ/kg.…”

Section: Biomass Boiler Geometry and Boundary Conditionsmentioning

confidence: 99%

“…The particle residence time and trajectory depend on each particle size and separate active burner. 24 The integration of the force balance, such as gravitational, buoyancy, and drag forces, greatly influenced the biomass particle motion. Figure 8b compares the average volume rate of the NOx formation and reduction in the four cases.…”

Section: Comparative Analysis Of Burner Standby Conditions On Char Co...mentioning

confidence: 99%

“…Its reduction by fuel NOx considerably contributed to the low-NOx emission at the boiler outlet. Additionally, the quantity of particles larger than 665 μm must be reduced in the biomass boiler . The reference case (R) was used to validate the CFD results by comparing them to the actual data.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the quantity of particles larger than 665 μm must be reduced in the biomass boiler. 24 The reference case (R) was used to validate the CFD results by comparing them to the actual data. Previous research focused on the NOx mechanism and influence of particle sizes on char conversion.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Numerical Optimization on Char Conversion and NOx Emission under Various Operating Conditions in a Retrofit Biomass Boiler

et al. 2023

Self Cite

View full text Add to dashboard Cite

Retrofitting retirement or existing fossil boiler with biomass is an important method of curbing electricity shortage and lowering the cost of modern power plants. However, the use of biomass combustion is hampered by operational problems, such as the resulting high unburned carbon, amount of bottom ash, and nitrogen oxide (NOx) release. In this study, we investigated the burning of pulverized biomass in a retrofitting boiler power plant using computational fluid dynamics of commercial software fluent ANSYS to determine the optimal combustion conditions. The objective of this study was to investigate a 125 MWe pulverized biomass boiler that was retrofitted from an anthracite down-fired boiler. The air distribution, including the influence of the secondary air ratio and the location of the burner standby, was evaluated. Key factors such as biomass ash mass at the hopper, char conversion, and high zone temperature relating to NOx formation/reduction were calculated. The adjustment of the secondary air ratio from 30 to 50% of the total air and the mass ash at the hopper significantly decreased to a low value at 247 kg/h and a high value of char conversion at 97.33% in case R (SA40%). The standard deviation temperature was 240 K at the BNR B−A level for case R, which was significantly lower than in other cases. This implies that the best mixing of air and biomass occurs in case R at 40%. Comparative analysis of the burner standby conditions showed that the NOx emission was similar at the boiler outlet (approximately 94−116 ppm). Burner A on standby, with a secondary air ratio of 40%, was used as the optimal case with the highest value of char conversion at 98.43%, the lowest bottom ash release of 204 kg/h, and a low-NOx emission of 106 ppm.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Biomass Boiler Geometry and Boundary Conditionsmentioning

confidence: 99%

Section: Comparative Analysis Of Burner Standby Conditions On Char Co...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations