Industrial-scale investigations of anthracite combustion characteristics and NO  emissions in a retrofitted 300 MWe down-fired utility boiler with swirl burners

Chen, Zhichao; Wang, Qingxiang; Zhang, Xiaoyan; Zeng, Lingyan; Zhang, Xin; He, Tianmin; Liu, Tao; Li, Zhengqi

doi:10.1016/j.apenergy.2017.05.138

Cited by 36 publications

(11 citation statements)

References 38 publications

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“…The detailed structures and principles of the new deepair-staged and low-NO x technology have been described in the literature. 25 2.3. Full-Scale Industrial Measurements.…”

Section: Methodsmentioning

confidence: 99%

Industrial Experiments on Anthracite Combustion and NO_x Emissions with Respect to Swirling Secondary Air for a 300 MW_e Deep-Air-Staged Down-Fired Utility Boiler

et al. 2018

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A new deep-air-staging and low-NO x technology has been introduced to a 300 MWe anthracite- and down-fired boiler with swirl burners. Industrial experiments were performed at different outer secondary air vane angles (defined as β) (i.e., 20°, 30°, 40°, and 50°) to evaluate the environmental and economic performance for the retrofitted boiler. Furthermore, combining with the previous investigations on the inner secondary air vane angle (defined as α), the influence degrees of β and α on anthracite combustion and NO x emissions for the retrofitted boiler were further analyzed and compared. The experimental results revealed that the main factors affecting the ignition and the flame fullness for β and α are different. Compared with α, β had a relatively greater influence on NO x emissions for the retrofitted boiler. Compared with the orignianl boiler, a strong reducing atmosphere was formed in the primary combustion zone for the retrofitted boiler, and for the β of approximately 30°, the arithmetic mean of NO x emissions in the whole measurement range was reduced by 1073 mg/m3 at 6% O2. Taking consideration of the environmental and economic effects, the optimal β for the retrofitted boiler was 20°.

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“…The detailed structures and principles of the new deepair-staged and low-NO x technology have been described in the literature. 25 2.3. Full-Scale Industrial Measurements.…”

Section: Methodsmentioning

confidence: 99%

Industrial Experiments on Anthracite Combustion and NO_x Emissions with Respect to Swirling Secondary Air for a 300 MW_e Deep-Air-Staged Down-Fired Utility Boiler

et al. 2018

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“…Down‐fired combustion is one of the three kinds of boiler combustion modes (down‐fired, wall‐fired, and tangentially fired). Down‐fired boilers have advantages of large furnace space, high furnace temperature, and long flame stroke 2,3 and are identified to be preferable to tangentially fired and wall‐fired boilers for burning the hard‐to‐burn coal 4,5 . Therefore, down‐fired boilers are widely used in China.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on bituminous coal blending in a down‐fired boiler with anthracite combustion system under low load

Yang

Huang²,

Gu³

et al. 2021

Asia-Pacific J Chem Eng

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The industrial experiments were carried out to study the bituminous coal blending in a 660‐MWe supercritical down‐fired boiler with anthracite combustion system under low load. The influence of the bituminous coal ratio on the boiler thermal efficiency, flue gas temperature, flue gas species, and heat transfer of various heating surfaces was analyzed in detail. The ignition distances of three experimental coals were measured, and the influence mechanism of bituminous coal blending on the combustion, heat transfer, and NOx emission in the furnace was proposed. The results show that increasing the bituminous coal blending ratio is beneficial to reduce NOx emissions. However, it leads to the rise of the exhaust gas temperature and the decrease of the boiler efficiency, which can be ascribed to the large amount of the cold primary air sent into the pulverizing system to control the air pulverized coal flow temperature at the mill outlet. The ignition distances of three experimental coals are different. The ignition distance from short to long follows the following order, that is, bituminous coal, lean coal, and anthracite. The earlier ignition of the bituminous coal leads to a sharp rise in the temperature of the airflow at the burner nozzle outlet, a rapid expansion of the airflow volume, and a sharp attenuation of the airflow rigidity, resulting in a short flame downward penetration depth and the upward movement of the flame center in the furnace. As the bituminous coal is blended, the change of the flame center and the flame fullness in the furnace affects the flue gas temperature distribution. Similarly, the change of the radiant heat transfer intensity and the convective heat transfer intensity affects the heat absorption distribution of the heating surface in the furnace.

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“…According to the original inventors and manufacturers, the currently main W‐shaped flame furnaces can be divided into four brands respectively labeled as Babcock and Wilcox (B&W), Foster Wheeler (FW), Mitsui Babcock Energy Limited (MBEL), and Stein 2 . Due to the rich reserves of low‐volatile coals and a large proportion of these coals in total coal consumption for thermal power generation, W‐shaped flame furnaces have popularized well in China since the first import from Britain in the late 1980s 3 . However, actual operations have shown that there exist universal problems of late coal ignition, unstable combustion, asymmetric combustion, high burnout loss (carbon content in fly ash above 8%), severe slagging, and high NO x emissions (conventionally higher than 1,100 mg/m 3 at 6% O 2 ) 4–6 .…”

Section: Introductionmentioning

confidence: 99%

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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Industrial-scale investigations of anthracite combustion characteristics and NO emissions in a retrofitted 300 MWe down-fired utility boiler with swirl burners

Cited by 36 publications

References 38 publications

Industrial Experiments on Anthracite Combustion and NO_x Emissions with Respect to Swirling Secondary Air for a 300 MW_e Deep-Air-Staged Down-Fired Utility Boiler

Industrial Experiments on Anthracite Combustion and NO_x Emissions with Respect to Swirling Secondary Air for a 300 MW_e Deep-Air-Staged Down-Fired Utility Boiler

Experimental study on bituminous coal blending in a down‐fired boiler with anthracite combustion system under low load

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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Industrial-scale investigations of anthracite combustion characteristics and NO emissions in a retrofitted 300 MWe down-fired utility boiler with swirl burners

Cited by 36 publications

References 38 publications

Industrial Experiments on Anthracite Combustion and NOx Emissions with Respect to Swirling Secondary Air for a 300 MWe Deep-Air-Staged Down-Fired Utility Boiler

Industrial Experiments on Anthracite Combustion and NOx Emissions with Respect to Swirling Secondary Air for a 300 MWe Deep-Air-Staged Down-Fired Utility Boiler

Experimental study on bituminous coal blending in a down‐fired boiler with anthracite combustion system under low load

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

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Industrial Experiments on Anthracite Combustion and NO_x Emissions with Respect to Swirling Secondary Air for a 300 MW_e Deep-Air-Staged Down-Fired Utility Boiler

Industrial Experiments on Anthracite Combustion and NO_x Emissions with Respect to Swirling Secondary Air for a 300 MW_e Deep-Air-Staged Down-Fired Utility Boiler

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