Industrial-scale Investigations on Combustion Characteristics and NOx Emissions of a 300-MWe Down-fired Boiler: Bituminous Coal Combustion and Coal Varieties Comparison

Xin, Zhang; Chen, Zhichao; Li, Liankai; Zeng, Lingyan; Li, Zhengqi

doi:10.1080/00102202.2021.1912028

Cited by 9 publications

(4 citation statements)

References 51 publications

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“…Meanwhile, this solution also showed functions of improving burnout and lowering NO x production. 7 In view of slagging mainly concentrated on wing walls, the central part of side walls, and the arch zone nearby the furnace throat, solutions of burning low slagging-tendency coals and shutting down burners nearby side walls 8 and rearranging the fuel-lean coal/air flow in the side near the front/rear walls 9 were proposed for weakening the slagging problem. A combination of late ignition, 10,11 shallow coal/air penetration depth, [12][13][14] and asymmetric combustion with poor combustion in one half-part furnace 4,15 accounted for the primary reason for poor burnout.…”

Section: Introductionmentioning

confidence: 99%

“…According to Steer et al 5 and Li et al, 6 the poor combustion stability could be alleviated via a fuel blending solution with biomass or bituminous coal co‐fired with anthracite. Meanwhile, this solution also showed functions of improving burnout and lowering NO x production 7 . In view of slagging mainly concentrated on wing walls, the central part of side walls, and the arch zone nearby the furnace throat, solutions of burning low slagging‐tendency coals and shutting down burners nearby side walls 8 and rearranging the fuel‐lean coal/air flow in the side near the front/rear walls 9 were proposed for weakening the slagging problem.…”

Section: Introductionmentioning

confidence: 99%

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High‐burnout and low‐NO_x combustion characteristics in a 600‐MW_e W‐shaped flame furnace: Air‐regulating solution selection as varying overfire air and impact of the overfire air ratio

Wang

Zhao

et al. 2023

Asia-Pacific J Chem Eng

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In order to establish an efficient air‐regulating solution as varying overfire air (OFA) and recommend an appropriate OFA ratio for a 600‐MWe W‐shaped flame furnace equipped with the proposed cascade‐arch‐firing low‐NOx and high‐burnout configuration (CLHC), four air‐regulating solutions were established by respectively adjusting the air into secondary air, tertiary air, and hopper air or proportionally varying the air into the three jets in a uniform distribution form, which were labeled in turn as SA, TA, HA, and UD, respectively. After the efficient air‐regulating solution fixed, four OFA ratios of 15%, 17.5%, 20%, and 22.5% were evaluated. Among the four air‐regulating solutions, only UD develops symmetrical combustion. An order of TA < HA < SA < UD in the final performance indexes enables UD as the efficient air‐regulating solution as varying OFA. A symmetrical flow field and combustion pattern develop at the former three OFA ratios. The excessive OFA ratio of 22.5% achieves a severely deflected flow field and asymmetric combustion. Increasing the OFA ratio generates a decrease‐to‐increase trend in burnout and a continuous decrease trend in NOx emissions. Consequently, the 20% setting is preferred as an appropriate OFA ratio, showing the best low‐NOx and high‐burnout accomplishment. The improvement in both burnout and NOx emissions as opening OFA to deepen air staging is attributed to the improved symmetrical combustion and the strengthened OFA penetration in the upper furnace.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High‐burnout and low‐NO_x combustion characteristics in a 600‐MW_e W‐shaped flame furnace: Air‐regulating solution selection as varying overfire air and impact of the overfire air ratio

Wang

Zhao

et al. 2023

Asia-Pacific J Chem Eng

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“…Subsequently, an improved version of the MIMSCT (i.e., performing a further burner nozzle layout optimization to fit for different down-fired furnace types) was popularized in several furnaces. [15][16][17] Ma et al 18 proposed a low-NO x art for a 600-MW e directflow-burner furnace via rearranging burners and introducing OFA to deepen air staging, finally gaining NO x levels of about 800 mg/m 3 (6% O 2 ) while worsening burnout a little. Chen et al 19 achieved a similar low-NO x accomplishment in a 600-MW e swirl-flow-burner furnace by altering the burner arrangement and using a separated OFA form.…”

Section: Introductionmentioning

confidence: 99%

“…For a multiple‐injection multiple‐staging combustion technology (MIMSCT) focused on high NO x generation plus asymmetric combustion, 14 its first industrial‐size trial in a 600‐MW e boiler achieved a moderate low‐NO x performance, that is, NO x production at 867 mg/m 3 (6% O 2 ) plus carbon content in fly ash at 5.4%. Subsequently, an improved version of the MIMSCT (i.e., performing a further burner nozzle layout optimization to fit for different down‐fired furnace types) was popularized in several furnaces 15–17 . Ma et al 18 proposed a low‐NO x art for a 600‐MW e direct‐flow‐burner furnace via rearranging burners and introducing OFA to deepen air staging, finally gaining NO x levels of about 800 mg/m 3 (6% O 2 ) while worsening burnout a little.…”

Section: Introductionmentioning

confidence: 99%

Strengthening low‐NO_x combustion with flue gas recirculation in a 600‐MW_e down‐fired furnace

Liu

Kuang

et al. 2022

Asia-Pacific J Chem Eng

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For a down-fired furnace using a cascade-arch-firing low-NO x and highburnout configuration (CLHC, which includes flue gas recirculation and is taken as a strengthened low-NO x combustion solution), the gas/particle flow, coal combustion, and NO x emissions were investigated at various flue gas recirculation (FGR) ratios of 5%, 10%, 15%, and 20% (labeled as settings of FGR = 5%, 10%, 15%, and 20%, respectively). The aim was to disclose the FGR role on the strengthened low-NO x combustion characteristics and meanwhile obtain an available FGR ratio. With increasing FGR, although the downward flame penetration increased continuously, the large local high-temperature zone favoring combustion in the furnace shrunk. Increasing FGR lowered gas temperatures and strengthened the reductive atmosphere in the downstream of the reburning zone to restrain combustion and meanwhile weaken the NOreduction effect of reburning. Trends of the final performance indexes with the FGR ratio showed that NO x production increased continuously, while burnout loss generally undergone an increase-to-decrease trend. In view of the above findings and the gained optimal furnace performance (i.e., NO x emissions of 530 mg/m 3 at 6% O 2 accompanied by carbon content in fly ash at 5.28%), low FGR levels such as FGR = 5% with a hot-air dilution in FGR should be preferred for the CLHC furnace where FGR is used to deliver the fine pulverizedcoal particles for reburning. In comparison to an advanced in-service low-NO x art, the CLHC reduced further NO x production by 41.4% while remained a high burnout achievement except a limited increase in CO emission.

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Activation of anthracite combustion by copper acetate: mechanism, effect of particle size and introduction method

Ларионов

Mishakov

Berezikov

et al. 2023

Int J Coal Sci Technol

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This paper addressed the effect of copper acetate on the combustion characteristics of anthracite depending on the fractional composition of fuel and additive introduction method. Anthracite was impregnated with 5 wt% of Cu(CH3COO)2 by mechanical mixing and incipient wetness impregnation. Four anthracite samples of different fraction with d < 0.1 mm, d = 0.1–0.5 mm, d = 0.5–1.0 mm, and d = 1.0–2.0 mm were compared. According to EDX mapping, incipient wetness impregnation provides a higher dispersion of the additive and its uniform distribution in the sample. The ignition and combustion characteristics of the modified anthracite samples were studied by thermal analysis and high-speed video recording of the processes in a combustion chamber (at heating medium temperature of 800 °C). It was found that copper acetate increases anthracite reactivity, which was evidenced by decreased onset temperature of combustion (ΔTi) by 35–190 °C and reduced ignition delay time (Δτi) by 2.1–5.4 s. Copper acetate reduces fuel underburning (on average by 70%) in the ash residue of anthracite and decreases the amount of CO and NOx in gas-phase products (on average by 18.5% and 20.8%, respectively). The mechanism for activation of anthracite combustion by copper acetate is proposed.

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Industrial-scale Investigations on Combustion Characteristics and NO_x Emissions of a 300-MW_e Down-fired Boiler: Bituminous Coal Combustion and Coal Varieties Comparison

Cited by 9 publications

References 51 publications

High‐burnout and low‐NO_x combustion characteristics in a 600‐MW_e W‐shaped flame furnace: Air‐regulating solution selection as varying overfire air and impact of the overfire air ratio

High‐burnout and low‐NO_x combustion characteristics in a 600‐MW_e W‐shaped flame furnace: Air‐regulating solution selection as varying overfire air and impact of the overfire air ratio

Strengthening low‐NO_x combustion with flue gas recirculation in a 600‐MW_e down‐fired furnace

Activation of anthracite combustion by copper acetate: mechanism, effect of particle size and introduction method

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Industrial-scale Investigations on Combustion Characteristics and NOx Emissions of a 300-MWe Down-fired Boiler: Bituminous Coal Combustion and Coal Varieties Comparison

Cited by 9 publications

References 51 publications

High‐burnout and low‐NOx combustion characteristics in a 600‐MWe W‐shaped flame furnace: Air‐regulating solution selection as varying overfire air and impact of the overfire air ratio

High‐burnout and low‐NOx combustion characteristics in a 600‐MWe W‐shaped flame furnace: Air‐regulating solution selection as varying overfire air and impact of the overfire air ratio

Strengthening low‐NOx combustion with flue gas recirculation in a 600‐MWe down‐fired furnace

Activation of anthracite combustion by copper acetate: mechanism, effect of particle size and introduction method

Contact Info

Product

Resources

About

Industrial-scale Investigations on Combustion Characteristics and NO_x Emissions of a 300-MW_e Down-fired Boiler: Bituminous Coal Combustion and Coal Varieties Comparison

High‐burnout and low‐NO_x combustion characteristics in a 600‐MW_e W‐shaped flame furnace: Air‐regulating solution selection as varying overfire air and impact of the overfire air ratio

High‐burnout and low‐NO_x combustion characteristics in a 600‐MW_e W‐shaped flame furnace: Air‐regulating solution selection as varying overfire air and impact of the overfire air ratio

Strengthening low‐NO_x combustion with flue gas recirculation in a 600‐MW_e down‐fired furnace