Influence of vent air valve opening on combustion characteristics of a down-fired pulverized-coal 300 MWe utility boiler

Li, Zhengqi; Ren, Feng; Zhang, Jie; Zhang, Xiaohui; Chen, Zhichao; Chen, Lizhe

doi:10.1016/j.fuel.2007.01.035

Cited by 57 publications

(48 citation statements)

References 15 publications

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“…Similar phenomenon could be found in a 300 MW e down-fired boiler. There, when the CCV is totally open, the flame also fluctuate largely [21]. From the point of view of fuel ignition, the value 20% offers then the best performance although 30% is also acceptable.…”

Section: Data Acquisition Methods and Experimental Conditionsmentioning

confidence: 99%

Combustion and NOx emissions characteristics of a down-fired 660-MWe utility boiler retro-fitted with air-surrounding-fuel concept

Ren

Liu

et al. 2011

Energy

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Section: Data Acquisition Methods and Experimental Conditionsmentioning

confidence: 99%

Combustion and NOx emissions characteristics of a down-fired 660-MWe utility boiler retro-fitted with air-surrounding-fuel concept

Ren

Liu

et al. 2011

Energy

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“…Before the experiment, the 1240-type probe is calibrated and the measurement error of velocity is below 2%. A detailed description of the measurement system can be found in refs and .…”

Section: Boiler and Essactmentioning

confidence: 99%

“…However, as a result of the distinctive combustion organization mode of down-fired boilers, with increasing the primary air ratio, the downward momentum and penetration depth of the coal/air flow from arches increase, which is beneficial to PC burnout. At the same time, the high-temperature recirculation zones under arches increase and the PC ignition is improved to a certain extent. − In particular, for the down-fired boiler after applying ESSACT, the burner secondary air on the fire-facing side is greatly reduced; thus, the PC is more easily heated and ignited by the recirculation zones under arches. Therefore, the promoting effect of PC ignition and burnout is enhanced by increasing the recirculation zone under arches caused by improving the primary air ratio.…”

Section: Introductionmentioning

confidence: 99%

Promotion of Anthracite Burnout for a 300 MW_e Down-Fired Boiler with a Novel Combustion Technology

et al. 2018

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Eccentric-swirl-secondary-air combustion technology (ESSACT) has been applied to a 300 MW e anthracite-and down-fired boiler with swirl burners. To improve burnout performance of the retrofitted boiler, the effects of primary air ratios on flow and combustion characteristics are investigated via cold-model aerodynamic experiments and industrial experiments. When primary air ratios are 17.09 and 19.08%, a deflective flow field occurs, and with increasing the primary air ratio from 21.11 to 24.75%, a symmetrical "W" flow field is formed. With increasing the primary air ratio from 17.09 to 24.75%, the maximum dimensionless vertical velocity of air flow near the front wall increases linearly from 0.364 to 0.521. Accordingly, the penetration depth in the real boiler increases by approximately 2.88 m. For a primary air ratio of 18.47%, the temperatures at the burner exit and in the furnace hopper near the front and rear walls are both seriously asymmetrical and the combustion path of pulverized coal particles by the rear wall is relatively short. When the primary air ratio increases from 21.18 to 23.85%, the combustion in the furnace is relatively symmetrical. The pulverized coal ignition distances are shortened continuously and are all within 1.2 m, and the temperature near the water-cooled wall in the furnace hopper increases by approximately 80 °C; the combustion path of pulverized coal particles increases continuously. When the combustion symmetry property, unburned combustible in fly ash, and NO x emissions are taken into account, the primary air ratio of 22.96% is preferable for the retrofitted down-fired boiler. In comparison to the original boiler, unburned combustible in fly ash decreases by 33.4% and NO x emissions decrease by 43.8%. In comparison to the preliminary application of ESSACT, unburned combustible in fly ash further decreases by 12.7% on the basis of a large reduction of NO x .

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“…Those will lead to lower deposition rate and weaken the advantages of this technique. Taking a page from the welding field, the double electrode gas metal arc welding (DE-GMAW) technique proposed by Zhang et al and improved by Li et al was characterized by reducing the heat input into the substrate through the bypass arc under the same deposition rate [11][12]. It was introduced into the weld-based additive manufacturing in our previous research [13].…”

Section: Introductionmentioning

confidence: 99%

Deposition Time and Thermal Cycles of Fabricating Thin-wall Steel Parts by Double Electrode GMAW Based Additive Manufacturing

Yang

Zhang

2016

MATEC Web Conf.

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Abstract. The deposition time for fabricating the thin-wall part as well as the peak temperature of the substrate during the process was analyzed in the double electrode gas metal arc welding (DE-GMAW) based additive manufacturing (AM). The total deposition time and the interlayer idle time of the manufacturing process decreased with the increasing of the bypass current under the same interlayer temperature and the same deposition rate. The thermal cycling curves illustrated that the peak temperature of the substrate was lower in the DE-GMAW base AM under the same conditions. When depositing the thin-wall parts, the DE-GMAW based AM can reduce the heat input to the substrate and improve the fabrication efficiency, compared with the GMAW based AM.

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Influence of vent air valve opening on combustion characteristics of a down-fired pulverized-coal 300 MWe utility boiler

Cited by 57 publications

References 15 publications

Combustion and NOx emissions characteristics of a down-fired 660-MWe utility boiler retro-fitted with air-surrounding-fuel concept

Combustion and NOx emissions characteristics of a down-fired 660-MWe utility boiler retro-fitted with air-surrounding-fuel concept

Promotion of Anthracite Burnout for a 300 MW_e Down-Fired Boiler with a Novel Combustion Technology

Deposition Time and Thermal Cycles of Fabricating Thin-wall Steel Parts by Double Electrode GMAW Based Additive Manufacturing

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Influence of vent air valve opening on combustion characteristics of a down-fired pulverized-coal 300 MWe utility boiler

Cited by 57 publications

References 15 publications

Combustion and NOx emissions characteristics of a down-fired 660-MWe utility boiler retro-fitted with air-surrounding-fuel concept

Combustion and NOx emissions characteristics of a down-fired 660-MWe utility boiler retro-fitted with air-surrounding-fuel concept

Promotion of Anthracite Burnout for a 300 MWe Down-Fired Boiler with a Novel Combustion Technology

Deposition Time and Thermal Cycles of Fabricating Thin-wall Steel Parts by Double Electrode GMAW Based Additive Manufacturing

Contact Info

Product

Resources

About

Promotion of Anthracite Burnout for a 300 MW_e Down-Fired Boiler with a Novel Combustion Technology