Characteristics and flame appearance of oxy-fuel combustion using flue gas recirculation

Abdelaal, Mohsen; El-Riedy, Medhat; El‐Nahas, Ahmed M.; El-Wahsh, Fathy R.

doi:10.1016/j.fuel.2021.120775

Cited by 22 publications

(5 citation statements)

References 17 publications

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“…-On pulverized coal boilers: Jun Li et al [9] studied the effect of internal recirculation (0-30%) of flue gases from a 55 MW pulverized coal-fired boiler with coal and/or biomass co-firing. According to the results obtained in the study, due to the organization of internal recirculation at this boiler, it was possible to achieve an overall reduction in the amount of NO X by 18%; -When burning kerosene: an experimental study by Mohsen Abdelaal et al [10] with a laboratory installation is described (recycled gas is mixed with an oxidizer before being fed into the burner). In the course of the study, it was found that the flame remains stable up to a recirculation level of 30-40% and turns blue at higher recirculation rates.…”

Section: Introductionmentioning

confidence: 98%

Improving the Efficiency of Fuel Combustion with the Use of Various Designs of Embrasures

Fedorov,

Generalov,

Sherkunov

et al. 2023

Energies

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Currently, NOX emission requirements for thermal power plants and power equipment are being tightened. Regime and technical measures are being developed to improve the efficiency of fuel combustion in boilers. Due to the high cost of field studies, and in some cases the impossibility of conducting them, mathematical modeling tools allow one to work out technical and tactical measures. In this paper, the multidisciplinary STAR-CCM+ platform with GMU-45 type burners is used to simulate the combustion of gaseous fuel in a digital model of an energy boiler of the type TGME-464. By conducting numerical experiments, the possibility of reducing NOX emissions by using flue gas recirculation is considered, and the efficiency of burner devices is compared when using different embrasure configurations.

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Section: Introductionmentioning

confidence: 98%

Improving the Efficiency of Fuel Combustion with the Use of Various Designs of Embrasures

Fedorov,

Generalov,

Sherkunov

et al. 2023

Energies

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“…Internal flue gas recirculation is an effective way to reduce SO X emissions, and an increase in the recirculation ratio leads to a significant reduction in NO X emissions; however, SO X increased slightly [30]. Mohsen Abdelaal and Medhat El-Riedy et al found that the flame remains stable up to a recirculation level of 40%, but the temperature decreases by about 25%, and the SO X content decreases from 90 to 5 ppm [31]. In this case, combustion instability can be associated with the level of NO X emissions in premix burners [32].…”

Section: Introductionmentioning

confidence: 99%

Applying the Random Forest Method to Improve Burner Efficiency

et al. 2022

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Fuel power plants are one of the main sources of pollutant emissions, so special attention should be paid to improving the efficiency of the fuel combustion process. The mathematical modeling of processes in the combustion chamber makes it possible to reliably predict and find the best dynamic characteristics of the operation of a power plant, in order to quantify the emission of harmful substances, as well as the environmental and technical and economic efficiency of various regime control actions and measures, and the use of new types of composite fuels. The main purpose of this article is to illustrate how machine learning methods can play an important role in modeling and predicting the performance and control of the combustion process. The paper proposes a mathematical model of an unsteady turbulent combustion process, presents a model of a combustion chamber with a combined burner, and performs a numerical study using the STAR-CCM+ multidisciplinary platform. The influence of various input indicators on the efficiency of burner devices, which is evaluated by several parameters at the output, is investigated. In this case, three possible states of the burners are assumed: optimal, satisfactory and unsatisfactory.

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“…Up to now, investigations about the FGR effect on the low-NO x combustion in down-fired furnaces firing low-volatile coal cannot be found in the published work. And in the aspect related to FGR in coal-fired furnaces, only a few of investigations were reported and the attention was focused only on the FGR application in tangential-fired or chain-grate furnaces fueled with the high-volatile coals such as bitumite and lignite, 11,20,21 where the conventional NO x reduction levels via FGR ranged in 20%-25%. Liu et al 22 explored effects of the FGR ratio and the FGR-delivered position via combustion tests in a labscale chamber and found that the highest NO x reduction reached 46.15% but with a worsened combustion efficiency as the cost.…”

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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Characteristics and flame appearance of oxy-fuel combustion using flue gas recirculation

Cited by 22 publications

References 17 publications

Improving the Efficiency of Fuel Combustion with the Use of Various Designs of Embrasures

Improving the Efficiency of Fuel Combustion with the Use of Various Designs of Embrasures

Applying the Random Forest Method to Improve Burner Efficiency

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

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Characteristics and flame appearance of oxy-fuel combustion using flue gas recirculation

Cited by 22 publications

References 17 publications

Improving the Efficiency of Fuel Combustion with the Use of Various Designs of Embrasures

Improving the Efficiency of Fuel Combustion with the Use of Various Designs of Embrasures

Applying the Random Forest Method to Improve Burner Efficiency

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

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Product

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