Combustion characteristic study with a flue gas internal and external double recirculation burner

Zhu, Yongyu; Wang, Chunhua; Chen, X.

doi:10.1016/j.cep.2021.108345

Cited by 17 publications

(6 citation statements)

References 11 publications

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“…The simulations employ a two-step methane mechanism and consider thermal, prompt, and intermediate NOx reaction mechanisms. 7 The finite volume method is used to solve the basic equations, 24 and the SIMPLE solver is used for pressure–velocity coupling. In spatial discretization, the convection terms of all transport equations are in a second-order upwind format.…”

Section: Methodsmentioning

confidence: 99%

“…Current low-NOx combustion technologies include staged combustion technology, flue gas recirculation, lean premixed combustion, and porous media combustion . Among them, the flue gas recirculation technology employs the burner structure for high-temperature flue gas dilution to reduce oxygen concentration and combustion temperature, therefore lessening NOx generation . Song et al applied flue gas recirculation technology in coal swirling combustion and found that the recirculation zone induced by the swirling flow enhanced the effect of flue gas recirculation and achieved stable low-NOx combustion.…”

Section: Introductionmentioning

confidence: 99%

“… 6 Among them, the flue gas recirculation technology employs the burner structure for high-temperature flue gas dilution to reduce oxygen concentration and combustion temperature, therefore lessening NOx generation. 7 Song et al 8 applied flue gas recirculation technology in coal swirling combustion and found that the recirculation zone induced by the swirling flow enhanced the effect of flue gas recirculation and achieved stable low-NOx combustion. Using numerical simulations, researchers have conducted numerous studies on flue gas recirculation low-NOx combustion technology.…”

Section: Introductionmentioning

confidence: 99%

“…Torkzadeh et al 9 successfully applied the k -omega SST model and the steady-state flamelet model in the numerical simulation of flue gas recirculation combustion and obtained consistent results with the experimental results. Through experimental and numerical simulations, Zhu et al 7 investigated the effect of flue gas recirculation rate on the temperature distribution and NOx emission in an industrial furnace. Zhou et al 10 used numerical simulation to optimize the flue gas recirculation structure, aiming to reduce NOx generation by changing the flow field distribution and forming a larger reducing atmosphere zone.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of the Combustion Characteristics in a Flue Gas Internal Recirculation Burner

Zhang

et al. 2022

ACS Omega

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The combustion characteristics and NOx emissions of a newly designed flue gas internal recirculation low-NOx burner (FIR) were studied. In the study, experimental and numerical simulations of the FIR low-NOx burner were conducted under natural inlet air conditions at three different powers. Results show that the fuel inlet strongly influences the jet effect, thus influencing the flue gas recirculation rate, flame stability, and NOx emissions. With a medium power of 20 kW, the NOx emission of a FIR low-NOx burner is lower than 30 mg/N m3. Higher or lower power will increase the NOx emissions or induce combustion instability. The swirling flow and bluff body structure can effectively improve the combustion stability. Three dominant frequencies of 54, 264, and 448 Hz can be observed from the power spectral densities of axial velocity, corresponding to the shedding vortex in the shear layer, the swirl frequency of processing vortex core (PVC), and the vortex induced by the PVC structure, respectively. The influences of vortex shedding and PVC structure are weak and inadequate to affect the overall flame stability.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of the Combustion Characteristics in a Flue Gas Internal Recirculation Burner

Zhang

et al. 2022

ACS Omega

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“…Firstly, the introduction of recirculation increases the amount of flue gas present in the primary combustion zone. Secondly, the decrease in the proportion of oxygen in the total air flow entering the furnace, coupled with the increase in the velocity of the airflow within the furnace [39], slows down the rate of combustion reaction [40].…”

Section: Effect Of Flue Gas Recirculation Ratementioning

confidence: 99%

Numerical Study on Effect of Flue Gas Recirculation and Co-Firing with Biomass on Combustion Characteristics in Octagonal Tangentially Lignite-Fired Boiler

Du,

Yang,

Zhao

et al. 2024

Energies

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The octagonal tangentially fired boiler can be utilized for burning lignite with high moisture. Co-firing biomass in an octagonal tangential boiler is considered a promising approach. A numerical simulation is carried out in this study to analyze the impact of flue gas recirculation (FGR) and the biomass blending ratio on heat and mass transfer in an octagonal tangentially fired boiler. When the FGR rate increases from 0 to 30%, the maximum temperature in the boiler decreases from 2162.8 to 2106.5 K. Simultaneously, the average temperature of the center longitudinal section decreases from 1589.0 to 1531.9 K. The maximum fluctuation of the outlet flue gas temperature remains within 10.9 K for the four calculated working conditions. Consequently, the efficiency of the boiler is basically unchanged. However, the flue gas temperature at the furnace outlet decreases significantly from 1605.9 to 1491.9 K. When the biomass blending ratio increases from 0 to 20%, the mean temperature of the primary combustion zone decreases from 1600.5 to 1571.2 K.

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Effects of Flue Gas Recirculation on NOx Emissions from Gas-Fired Utility Boilers

Tanasić¹,

Stamenić

Tanasić³

2021

Current Problems in Experimental and Computational Engineering

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Gas-fired utility boilers are most common in the district heating system in the city of Belgrade. Thus, they are an important stationary source of NOx emissions, which are particularly harmful for people and environment. In this paper the effectiveness of the flue gas recirculation (FGR) system that is applied to reduce NOx emissions of the utility hot water and steam boilers in district heating plant is experimentally investigated. Two types of systems are analysed; the first with the application of flue gas recirculation fan at hot water boilers; and the second without the application of flue gas recirculation fan at steam boilers. In both cases the rate of flue gas recirculation was 10%. The results of measurements showed that applied FGR systems efficiently reduced NOx emissions from utility boilers by 20 to 50% and below the reference values defined by legislative regulations. Emissions are higher at steam boiler which is expected because of the higher flue gas temperature at boiler furnace. Since the measured values for hot water boilers are close to the reference values, it was concluded that there is a potential for further improvements by increasing the flue gas recirculation rate.

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Combustion characteristic study with a flue gas internal and external double recirculation burner

Cited by 17 publications

References 11 publications

Numerical Simulation of the Combustion Characteristics in a Flue Gas Internal Recirculation Burner

Numerical Simulation of the Combustion Characteristics in a Flue Gas Internal Recirculation Burner

Numerical Study on Effect of Flue Gas Recirculation and Co-Firing with Biomass on Combustion Characteristics in Octagonal Tangentially Lignite-Fired Boiler

Effects of Flue Gas Recirculation on NOx Emissions from Gas-Fired Utility Boilers

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