Gas/Particle Flow Characteristics, Combustion and NOx Emissions of Down-Fired 600 MWe Supercritical Utility Boilers with Respect to Two Configurations of Combustion Systems

2012 ◽  
Vol 26 (6) ◽  
pp. 3316-3328 ◽  
Author(s):  
Min Kuang ◽  
Zhengqi Li ◽  
Qunyi Zhu ◽  
Lizhe Chen ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Flow Characteristics ◽  
Particle Flow ◽  
Nox Emissions ◽  
Utility Boilers ◽  
Combustion Systems

scholarly journals Reduction of Unburned Carbon Release and NOx Emission from a Pulverized Wood Pellet Boiler Retrofitted for Fuel Switching from Coal

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5077 ◽  
Author(s):  
Jiseok Lee ◽  
Seunghan Yu ◽  
Jinje Park ◽  
Hyunbin Jo ◽  
Jongkeun Park ◽  
...  
Keyword(s):  
Power Plant ◽  
Bottom Ash ◽  
Flow Characteristics ◽  
Electricity Production ◽  
Unburned Carbon ◽  
Nox Emissions ◽  
Wood Pellet ◽  
Operating Variables ◽  
Carbon Release ◽  
Air Staging

For renewable electricity production, biomass can fully displace coal in an existing power plant with some equipment modifications. Recently, a 125 MWe power plant burning mainly anthracite in Korea was retrofitted for dedicated wood pellet combustion with a change of boiler configuration from arch firing to wall firing. However, this boiler suffers from operational problems caused by high unburned carbon (UBC) contents in the bottom ash. This study comprises an investigation of some methods to reduce the UBC release while achieving lower NOx emissions. The computational fluid dynamics approach was established and validated for typical operating data. Subsequently, it was applied to elucidate the particle combustion and flow characteristics leading to the high UBC content and to evaluate the operating variables for improving the boiler performance. It was found that the high UBC content in the bottom ash was a combined effect of the poor fuel grindability and low gas velocity in the wide burner zone originating from the arch-firing boiler. This prevented the operation with deeper air staging for lower NOx emissions. Reducing the particle size to <1.5 mm by modifying mills or pretreating the fuel using torrefaction was the only effective way of lowering the UBC and NOx emissions with deeper air staging while increasing the boiler efficiency.

Experimental investigations on air/particle flow characteristics in a 2000 t/d GSP pulverized coal gasifier with an improved burner

Energy ◽  
2018 ◽  
Vol 165 ◽  
pp. 432-441 ◽  
Author(s):  
Neng Fang ◽  
Zhengqi Li ◽  
Jiaquan Wang ◽  
Bin Zhang ◽  
Lingyan Zeng ◽  
...  
Keyword(s):  
Flow Characteristics ◽  
Pulverized Coal ◽  
Particle Flow ◽  
Experimental Investigations ◽  
Coal Gasifier

Computational investigation of particle flow characteristics in pressurised dense phase pneumatic conveying systems

2018 ◽  
Vol 329 ◽  
pp. 241-251 ◽  
Author(s):  
Shanshan Sun ◽  
Zhulin Yuan ◽  
Zhengbiao Peng ◽  
Behdad Moghtaderi ◽  
Elham Doroodchi
Keyword(s):  
Flow Characteristics ◽  
Particle Flow ◽  
Pneumatic Conveying ◽  
Computational Investigation ◽  
Dense Phase

scholarly journals Influence of offset angle of mid-secondary air nozzles on gas-particle flow characteristics in a furnace

RSC Advances ◽  
2018 ◽  
Vol 8 (32) ◽  
pp. 17764-17772 ◽  
Author(s):  
Zhiqiang Wang ◽  
Yingjie Hu ◽  
Xingxing Cheng ◽  
Ming Liu ◽  
Chunyuan Ma
Keyword(s):  
Flow Characteristics ◽  
Particle Flow ◽  
Secondary Air

The influence of the offset angle of mid-secondary air nozzles on gas-particle flow characteristics was investigated by PDA.

Effects of Flue Gas Recirculation on NOx Emissions from Gas-Fired Utility Boilers

2021 ◽  
pp. 319-337
Author(s):  
Nikola Tanasić ◽  
Mirjana Stamenić ◽  
Vladimir Tanasić
Keyword(s):  
Flue Gas ◽  
Nox Emissions ◽  
Flue Gas Recirculation ◽  
Utility Boilers ◽  
Gas Recirculation
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