Numerical Simulation of By-Product Fuel Combustion in a Tangential Gas-Fired Boiler: Effect of Proportion and Angle on Coke Oven Gas

Yi, Zhengming; Hu, Xuman

doi:10.1061/(asce)ey.1943-7897.0000826

Cited by 3 publications

(2 citation statements)

References 29 publications

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“…The interface between the burner and the furnace is set up by using the boundary conditions of the Interface in order to resolve the difficulty. Considering the influence of grid quantity on the calculation accuracy and the simulation speed, three meshing schemes have been performed in this study according to a method of a grid independent test [5,44]. The quantity of grid cells is 2.78 million, 3.82 million and 4.60 million, respectively.…”

Section: Geometric Modeling and Grid Division Methodsmentioning

confidence: 99%

Study on Combustion Characteristics and NOx Formation in 600 MW Coal-Fired Boiler Based on Numerical Simulation

Zhu¹,

Shang

X³

et al. 2022

Energies

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The variations in the boiler operation conditions have a great effect on the combustion characteristics and the pollutant formation in furnaces. This work aims to investigate the effects of operational parameters on NOx formation and its distribution in furnaces using the numerical simulation method to obtain the optimum control strategy for reducing NOx emissions. The numerical simulation models of pulverized coal combustion in furnaces involving flow, heat transfer, combustion and NOx formation are established. Taking a 600 MW supercritical opposed firing pulverized coal boiler as the study object, a full-scale three-dimensional physical model of the boiler is constructed with Gambit software. On this basis, the pulverized coal combustion and the NOx formation under various boiler loads are numerically simulated using the software of Ansys Fluent 2021R1, and the accuracy and the reliability of the models established are verified by comparing the simulation data with the field test data. According to the combustion numerical simulation of 128 groups of operating conditions, the effects of boiler load, the air rate and the air temperature on combustion and NOx formation have been emphatically investigated. The simulation results indicate that the formation of NOx and the NOx concentration distribution are mainly affected by the oxygen concentration and the temperature in the furnace. Especially, the effects of the variation in the excess air coefficient, the over-fire air (OFA) ratio, the primary air ratio and the internal secondary air ratio on NOx concentration distribution vary greatly. When the air temperature increases the overall NOx concentration in the furnace increases, and the influence of the secondary air temperature and the OFA temperature is greater than that of the primary air temperature. Large amounts of simulation data are a necessary data source for further study on the NOx prediction model at the economizer outlet, which can improve the prediction ability and the generalization ability of the NOx prediction model.

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Section: Geometric Modeling and Grid Division Methodsmentioning

confidence: 99%

Study on Combustion Characteristics and NOx Formation in 600 MW Coal-Fired Boiler Based on Numerical Simulation

Zhu¹,

Shang

X³

et al. 2022

Energies

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“…All gases generated in integrated smelters (coke oven gas—COG, blast furnace gas—BFG, and basic oxygen furnace gas, converter gas—BOFG) undergo a purification process. Among others, process gases after cleaning can be used by the smelters in the production cycle as follows: fire coke batteries in a coking plant (COG) [ 12 ]; generate heat, steam, and electricity for the smelter’s own needs (COG, BFG) [ 13 , 14 ]. ; ignite the sinter mixture on sinter strands in ignition furnaces (a mixture of BFG and COG) [ 15 ]; increase coke savings in blast furnaces (COG, BFG, BOFG, or COREX gas as hot reduction gas after removal (CO 2 )) [ 16 , 17 ]; fire blast heaters (BFG with COG or oxygen-enriched blast with recirculation of blast furnace exhaust) [ 18 ]; supply heating furnaces in hot rolling mills (COG, BFG) [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Usage of Converter Gas as a Substitute Fuel for a Tunnel Furnace in Steelworks

Musiał

Szwaja

Kurtyka³

et al. 2022

Materials

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Converter gas (BOFG) is a by-product of the steel manufacturing process in steelworks. Its usage as a substitute fuel instead of natural gas for fueling a metallurgical furnace seems to be reasonable due to potential benefits as follows: CO2 emission reduction into the ambient air and savings in purchasing costs of natural gas. Results of theoretical analysis focused on implementing converter gas as a fuel for feeding a tunnel furnace for either steel plate rolling, steel sheet hardening in its real working condition or both, are discussed. The analysis was focused on the combustion chemistry of the converter gas and its potential ecological and economic benefits obtained from converter gas usage to heat up steel in a tunnel furnace. Simulations of combustion were conducted using a skeletal chemical kinetic mechanism by Konnov. The directed relation graph with error propagation aided sensitivity analysis (DRGEPSA) method was used to obtain this skeletal kinetic mechanism. Finally, the model was validated on a real tunnel furnace fueled by natural gas. Regarding exhaust emissions, it was found that nitric oxide (NO) dropped down from 275 to 80 ppm when natural gas was replaced by converter gas. However, carbon dioxide emissions increased more than three times in this case, but there is no possibility of eliminating carbon dioxide from steel manufacturing processes at all. Economic analysis showed savings of 44% in fuel purchase costs when natural gas was replaced by converter gas. Summing up, the potential benefits resulting from substituting natural gas with converter gas led to the conclusion that converter gas is strongly recommended as fuel for a tunnel furnace in the steel manufacturing process. Practical application requires testing gas burners in terms of their efficiency, which should provide the same amount of energy supplied to the furnace when fed with converter gas.

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Numerical simulation study on combustion characteristics and NOx emission of COREX gas swirl burner and boiler

Liu

Zhu

Zhou

2023

Fuel

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Numerical Simulation of By-Product Fuel Combustion in a Tangential Gas-Fired Boiler: Effect of Proportion and Angle on Coke Oven Gas

Cited by 3 publications

References 29 publications

Study on Combustion Characteristics and NOx Formation in 600 MW Coal-Fired Boiler Based on Numerical Simulation

Study on Combustion Characteristics and NOx Formation in 600 MW Coal-Fired Boiler Based on Numerical Simulation

Usage of Converter Gas as a Substitute Fuel for a Tunnel Furnace in Steelworks

Numerical simulation study on combustion characteristics and NOx emission of COREX gas swirl burner and boiler

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