Effect of different inner secondary-air vane angles on combustion characteristics of primary combustion zone for a down-fired 300-MWe utility boiler with overfire air

Wang, Qingxiang; Chen, Zhichao; Che, Miaomiao; Zeng, Lingyan; Li, Zhengqi; Song, Ming

doi:10.1016/j.apenergy.2016.08.127

Cited by 40 publications

(31 citation statements)

References 35 publications

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“…In literature, Wang et al . explore a 300 MW e utility boiler with 0.69% nitrogen in coal content as well as 17.9% overfire air (OFA) ratio, and their result is around 674–765 mg/m 3 (at 6% O 2 ) NO x in flue gas. Zhao et al .…”

Section: Introductionsupporting

confidence: 92%

“…As reported in literature [33,34], the latter can be measured by Equation (11). Another multiplier in Equation (9), NO x standard concentration c NOx ,6% , is settled by modifying NO x concentration in real flue gas according to Equation (12). Generally, NO x is formed in two ways: fuel-NO x and thermal-NO x , as shown in Equation (14).…”

Section: Co 2 Equivalent Of N 2 O Emissionsmentioning

confidence: 99%

“…Furthermore, the latter is determined by three factors: coal combustion velocity, real flue gas produced by unit coal, and NO x standard concentration, which are specified in Equation (9). According to mass balance in coal combustion process [31,33,34], real flue gas V flue, real , and NO x standard concentration c NOx ,6% are measured by Equations (10-11) and Equations (12)(13)(14), respectively.…”

Section: Co 2 Equivalent Of N 2 O Emissionsmentioning

confidence: 99%

“…For existing power plant, government set an upper boundary at 200 mg/Nm 3 after 2014 [11]. In literature, Wang et al [12] explore a 300 MW e utility boiler with 0.69% nitrogen in coal content as well as 17.9% overfire air (OFA) ratio, and their result is around 674-765 mg/m 3 (at 6% O 2 ) NO x in flue gas. Zhao et al [13] investigate eight power plants in China and get that NO x concentration varies from 237 to 945 mg/Nm 3 , where main influence factors are associated with unit size, coal content, boiler type, and combustion pattern.…”

Section: Introductionmentioning

confidence: 99%

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GHGs emission and mitigation burden for power plants in western china considering N₂O and SO₂ removal

2019

Env Prog and Sustain Energy

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Focusing on greenhouse gases (GHGs), this article explores the actual emissions and mitigation burden of coal‐fired power plants in western region of China. Utilizing the 2006 IPCC technology‐detailed methodology, this article developed a coal content‐based GHG measurement system under consideration of N2O emission and SO2 removal, thereafter employed it to evaluate 151 power plants in western China in 2014. At regional level, the three segmented emission sources: CO2 and N2O from coal combustion, and CO2 from sulfur content depreciation, each contributes to emission intensity at 1011.26, 8.24 and 6.09 gCO2e/KWh, respectively. At plant‐specific level, emission intensity is very different, with an average of 1025.60 as well as an interval of 722.38–1796.67 gCO2e/KWh, which implies large gap in mitigation burden among power plants. Comparing mitigation cost of two pathways: CCS technology and carbon market mechanism, it is verified that on average, the former induces electricity price raised by 64.84%–97.26%, while the latter only induces 8.32% upward. From mitigation burden perspective, carbon market is more feasible than CCS technology to motivate power plant to carry out GHGs abatement in the short‐run period. © 2019 American Institute of Chemical Engineers Environ Prog, 38: e13224, 2019

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Section: Introductionsupporting

confidence: 92%

Section: Co 2 Equivalent Of N 2 O Emissionsmentioning

confidence: 99%

Section: Co 2 Equivalent Of N 2 O Emissionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

GHGs emission and mitigation burden for power plants in western china considering N₂O and SO₂ removal

2019

Env Prog and Sustain Energy

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“…Meanwhile, the structure of swirling burners is also a research interest of many investigators. Wang et al [12] experimentally researched the effect of inner secondary air vane angles of swirl burners for 300 MW down-fired boilers on NO x reduction, and gave the optimal angle value. Ti et.al.…”

Section: Introductionmentioning

confidence: 99%

Combustion Characteristics and NOx Emission through a Swirling Burner with Adjustable Flaring Angle

et al. 2018

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A swirling burner with a variable inner secondary air (ISA) flaring angle β is proposed and a laboratory scale opposed-firing furnace is built. Temperature distribution and NOx emission are designedly measured. The combustion characteristics affected by variable β are experimentally evaluated from ignition and burnout data. Meanwhile, NOx reduction by the variable β is analyzed through emissions measurements. Different inner/outer primary coal-air concentration ratios γ, thermal loads and coal types are considered in this study. Results indicate that β variation provides a new approach to promote ignition and burnout, as well as NOx emission reduction under conditions of fuel rich/lean combustion and load variation. The recommended β of a swirling burner under different conditions is not always constant. The optimal βopt of the swirling burner under all conditions for different burning performance are summarized in the form of curves, which could provide reference for exquisite combustion adjustment.

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Impact of the upper/lower furnace depth ratio on the strengthened low‐NO_x combustion performance in a two‐stage W‐shaped flame furnace

Zhao

Kuang

Liu

et al. 2021

Asia-Pacific J Chem Eng

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For achieving the strengthened low‐NOx combustion plus high burnout in W‐shaped flame furnaces, a cascade‐arch low‐NOx and high‐burnout configuration (CLHC) is realized by positioning two burner layers in a 600 MWe furnace. The gas/particle flow, combustion, and NOx emission characteristics in the furnace are numerically evaluated at four upper/lower furnace depth ratios of CW = 0.458, 0.500, 0.529, and 0.558 (CW signifying the furnace throat shrinkage level) so as to disclose the impact of the furnace throat shrinkage level on the overall furnace performance and meanwhile establish an available CW setup. Increasing CW initially updates but then deteriorates the low‐NOx combustion performance. At the narrowest CW = 0.485 setup, the gained slightly asymmetric combustion shows relatively lower burnout loss but higher NOx emissions, while the widest CW = 0.558 setup forms severely asymmetric combustion with apparently raised carbon in fly ash but relatively lower NOx emissions. At moderate setups of CW = 0.500 and 0.529, a symmetrical combustion pattern develops, showing the low‐NOx and high‐burnout performance characterized as NOx emissions of 700–707 mg/m3 (6% O2) and carbon content in fly ash of 5.4–5.5%. In comparison to CW = 0.500, the larger downward flame penetration, higher flame fullness, and lower CO emission at CW = 0.529 suggest that a reasonable upper/lower furnace depth ratio prefers CW = 0.529. Compared with a currently advanced low‐NOx combustion technology, the CLHC lowers again NOx emissions by about 200 mg/m3 (6% O2) while maintaining high burnout, which confirms the CLHC's availability.

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Effect of different inner secondary-air vane angles on combustion characteristics of primary combustion zone for a down-fired 300-MWe utility boiler with overfire air

Cited by 40 publications

References 35 publications

GHGs emission and mitigation burden for power plants in western china considering N₂O and SO₂ removal

GHGs emission and mitigation burden for power plants in western china considering N₂O and SO₂ removal

Combustion Characteristics and NOx Emission through a Swirling Burner with Adjustable Flaring Angle

Impact of the upper/lower furnace depth ratio on the strengthened low‐NO_x combustion performance in a two‐stage W‐shaped flame furnace

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Effect of different inner secondary-air vane angles on combustion characteristics of primary combustion zone for a down-fired 300-MWe utility boiler with overfire air

Cited by 40 publications

References 35 publications

GHGs emission and mitigation burden for power plants in western china considering N2O and SO2 removal

GHGs emission and mitigation burden for power plants in western china considering N2O and SO2 removal

Combustion Characteristics and NOx Emission through a Swirling Burner with Adjustable Flaring Angle

Impact of the upper/lower furnace depth ratio on the strengthened low‐NOx combustion performance in a two‐stage W‐shaped flame furnace

Contact Info

Product

Resources

About

GHGs emission and mitigation burden for power plants in western china considering N₂O and SO₂ removal

GHGs emission and mitigation burden for power plants in western china considering N₂O and SO₂ removal

Impact of the upper/lower furnace depth ratio on the strengthened low‐NO_x combustion performance in a two‐stage W‐shaped flame furnace