Numerical investigation on oxy-combustion characteristics of a 200MWe tangentially fired boiler

Guo, Junjun; Liu, Zhaohui; Wang, Peng; Huang, Xiaohong; Li, Jing; Xu, Peng; Chen, Zheng

doi:10.1016/j.fuel.2014.09.125

Cited by 75 publications

(30 citation statements)

References 43 publications

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“…On the other hand, the temperature of the flue gas also decreases due to the change in chemical reaction kinetics under the oxy‐fuel combustion condition. Meanwhile, the temperature under oxy‐fuel with dry recycling is slightly lower than that under oxy‐fuel with wet recycling, which is in agreement with the results in the literature …”

Section: Resultssupporting

confidence: 92%

“…The traditional gray gas‐weighted model is no longer applicable under oxy‐fuel combustion due to the share of three atomic gas CO 2 and H 2 O increasing. This study adopted the improved gray‐gas weighted model developed by Huazhong University of Science and Technology (HUST) to adapt to the gas pressure ratio and the large light path in the oxy‐fuel combustion boilers . The radiation characteristics of the particles have a dominant influence on the radiation characteristics of the medium in the furnace.…”

Section: Model and Boundary Conditionsmentioning

confidence: 99%

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Numerical simulation of oxy‐fuel combustion characteristics in a 200 MWe coal‐fired boiler

Yu²,

Liu

et al. 2019

Greenhouse Gases

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Oxy‐fuel combustion in coal‐fired plants has become one of the most promising technologies for carbon capture and storage (CCS). Because of the obvious difference between the oxy‐fuel combustion medium (O2/CO2) and air in the atmosphere (O2/N2), the characteristics of combustion, heat transfer, etc., under oxy‐fuel combustion have changed greatly from those under air combustion. In this paper, computational fluid dynamics (CFD) simulation was used to investigate pulverized coal combustion in a 200 MWe tangentially fired oxy‐fuel combustion boiler. Improved models for the gas radiative properties and chemical reaction mechanisms were incorporated into the CFD code. Both conventional air‐fired and oxy‐fuel combustion were operated. Different flue gas recycling patterns (dry recycling and wet recycling) were also investigated. The temperature distribution in the furnace, the temperature field, and the CO concentration field in each scheme were analyzed, this being relevant to the design of oxy‐fuel combustion boilers. It was found that combustion could form a good tangential circle and stable temperature field in the furnace either under air‐fired or oxy‐fule combustion conditions. The temperature under oxy‐fuel combustion was lower than with air combustion. The burnout rate under the air condition was lower than that with the oxy‐fuel combustion condition. With oxy‐fuel combustion, it is necessary to pay special attention to the slagging tendency of the primary combustion zone in the furnace. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 92%

Section: Model and Boundary Conditionsmentioning

confidence: 99%

Numerical simulation of oxy‐fuel combustion characteristics in a 200 MWe coal‐fired boiler

Yu²,

Liu

et al. 2019

Greenhouse Gases

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“…The mole fraction ratios reach 4 in these two models. But the studies show that the CO 2 concentration was difficult to become lower than 40% [30,31], even in oxy-fuel combustion with wet recycle, so the mole fraction ratios cannot be larger than two. The large range will increase the fitting error, so there is no need for a large range of mole fraction ratios.…”

Section: Introductionmentioning

confidence: 99%

A full spectrum k-distribution based weighted-sum-of-gray-gases model for oxy-fuel combustion

Guo

Huang

et al. 2015

International Journal of Heat and Mass Transfer

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“…The gas temperature of primary air (PA) maintains at 363 K in each case. For secondary air (SA) and separated over‐fire air (SOFA), the temperature is 608 K. Noteworthy, all SOFA nozzles were closed in cases with 30% O 2 fraction . Actually, half SOFA ports are also out of service when O 2 fraction is 27% for the same purpose.…”

Section: Simulation Object and Casesmentioning

confidence: 99%

Combustion and heat transfer characteristics of co-firing biomass and coal under oxy-fuel condition

Wang

Liu

et al. 2018

Int J Energy Res

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Summary A numerical investigation was conducted on co‐firing biomass and coal under oxy‐fuel condition with the refined combustion model. The effects of gas‐phase reactions caused by various volatiles of coal and biomass were considered. The influences of biomass fraction and combustion atmosphere on the reaction rate of volatile, the distribution of wall heat flux, and the burnout behavior were analyzed. The results show that the reaction is more active for the volatile of Paulownia wood chips than that of coal. The average wall heat flux suffers a decline when the combustion atmosphere is switched from air to oxy‐fuel condition, while the O2 fraction is 24%. The wall heat flux of hopper rises by 29.97% to 162.7% as the biomass fraction increases from 10% to 30% under various atmospheres. Due to the variation in trajectories of fuel particles and the change of temperature within the furnace, the combustion atmosphere and the biomass share fraction affect the burnout performance to some extent. The working performances of all cases were evaluated, and the optimal operation conditions for co‐firing different co‐firing scenarios were recommended.

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Numerical investigation on oxy-combustion characteristics of a 200MWe tangentially fired boiler

Cited by 75 publications

References 43 publications

Numerical simulation of oxy‐fuel combustion characteristics in a 200 MWe coal‐fired boiler

Numerical simulation of oxy‐fuel combustion characteristics in a 200 MWe coal‐fired boiler

A full spectrum k-distribution based weighted-sum-of-gray-gases model for oxy-fuel combustion

Combustion and heat transfer characteristics of co-firing biomass and coal under oxy-fuel condition

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