An Investigation of the Interaction between NOx and SOx in Oxy-Combustion

Choudhury, Nujhat; Padak, Bihter

doi:10.1021/acs.est.7b02064

Cited by 8 publications

(2 citation statements)

References 40 publications

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“…Chagger et al [9] later conducted further research on the primary reactions involved in the sulphur-nitrogen interactions and determined that the dominant reaction during fuel-rich conditions is HS + NO = SN + OH. Through both experiments and numerical simulations, Choudhury et al [10] explored the interaction between sulphur and nitrogen components during combustion, respectively. Oxyfuel combustion experiments were performed using CH 4 gas doped with NO and SO 2 as fuel, and the addition of NO was found to lead to a decrease in the concentration of SO 3 .…”

Section: Introductionmentioning

confidence: 99%

Modelling the Mechanism of Sulphur Evolution in the Coal Combustion Process: The Effect of Sulphur–Nitrogen Interactions and Excess Air Coefficients

Jiang

Yang

2023

Processes

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The efficient use of coal resources and the safe operation of coal-fired boilers are hindered by high-temperature corrosion caused by corrosive sulphur components. To predict the impact of sulphur–nitrogen interactions on sulphur’s evolution and its mechanism of action, a conventional sulphur component evolution model (uS–N) and an improved sulphur component evolution model (S–N) that considers sulphur–nitrogen interactions were proposed in the present study. The models were built using OpenFOAM–v8 software for the coal combustion process, and the generation of SO2, H2S, COS, and CS2 was simulated and analysed under different air excess coefficients. The simulations were conducted to analyse the patterns of SO2, H2S, COS, and CS2 generation at different air excess factors. The results show that, compared with the uS–N condition, the simulated values of coal combustion products (SO2, H2S, COS, and CS2) under the S–N condition were closer to the experimental values, and the errors of different sulphur components at the furnace exit were all less than 5%. As such, the S–N model can more accurately predict the evolution of sulphur components. In the simulation range, when the air excess factor increased from 0.7 to 0.9, the production rate of SO2 increased, while the production rates of corrosive sulphur components H2S, COS, and CS2 decreased significantly by 41.3%, 34.8%, and 53.8%, respectively. Further, the mechanism of the effect of sulphur–nitrogen interactions on the generation rates of different components was revealed at different air excess coefficients. Here, the effect of sulphur–nitrogen interactions on SO2 and COS was found to be more significant at smaller air excess coefficients, and the effect of sulphur–nitrogen interactions on H2S and CS2 was more significant at larger air excess coefficients. The present study can provide a theoretical basis for predicting the evolution of sulphur components during coal combustion and improving the high-temperature corrosion problems caused by such a process.

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Section: Introductionmentioning

confidence: 99%

Modelling the Mechanism of Sulphur Evolution in the Coal Combustion Process: The Effect of Sulphur–Nitrogen Interactions and Excess Air Coefficients

Jiang

Yang

2023

Processes

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“…Hydrogen is considered as one of the most ideal energy carriers due to its high efficiency and cleanness. 1,2 Direct combustion of coal produces numerous pollution emissions, such as CO 2 , 3-5 SO X , 6 NO X 7,8 and fine particulate matter. 9 Therefore, there is strong interest in converting coal into hydrogen.…”

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confidence: 99%

Novel Pt-Ni Electrocatalyst for Coal Electrolysis for Hydrogen Production

Zheng

et al. 2022

J. Electrochem. Soc.

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Carbon fiber-supported Pi-Ni binary alloy electrocatalyst (Pi-Ni/CFs) with different nickel contents is synthesized using impregnation-hydrogen reduction method for coal electrolysis to produce hydrogen. The electrode based on the Pt-Ni/CFs is characterized using X-ray diffraction, scanning electron microscope with energy-dispersive X-ray analysis and X-ray photoelectron spectroscopy and transmission electron microscopy. The results indicate Pt-Ni alloy formed on the CFs. Electrochemical results show that Pt-Ni/CFs have higher electrocatalytic activity than pure Pt/CFs, with Pt-Ni/CFs (1:1) electrode exhibiting the best performance. Compared with the pure Pt/CFs, the efficiency of coal electrolysis for hydrogen production is increased by 13.8% with Pt-Ni/CFs (1:1). The improved performance of Pt-Ni/CFs is attributed to the modification of surface electronic properties due to metallic alloying.

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