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Energies 2018, 11(8), 2158; https://doi.org/10.3390/en11082158

Migration and Transformation of Vanadium and Nickel in High Sulfur Petroleum Coke during Gasification Processes

1
,
1,* , 1
,
1
,
2
and
1,*
1
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China
2
Wuhan Huayu Energy-Burning Engineering Technology Co. Ltd., G3, New Energy Building, Future City, No. 999 Gaoxin Avenue, East Lake High-tech Zone, Wuhan 430206, China
*
Authors to whom correspondence should be addressed.
Received: 26 July 2018 / Revised: 12 August 2018 / Accepted: 14 August 2018 / Published: 18 August 2018
(This article belongs to the Special Issue Solid Waste Gasification)
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Abstract

The volatilization characteristics and occurrence forms of V and Ni in petroleum coke (petcoke) were investigated during steam (H2O) and carbon dioxide (CO2) gasification on a fixed bed reactor at 800–1100 °C. The Tessier sequential chemical extraction procedure was employed to determine the different forms of V and Ni. The results showed their volatilities were not dependent on the gasification atmosphere, but rather relied mainly on the reaction temperature. The CO2 atmosphere accelerated the conversion of organic-bound nickel to residual form at low temperature and promoted Fe-Mn oxides formation at high temperature. However, the H2O atmosphere was conducive to form vanadium bound to Fe-Mn oxides and promoted the decomposition of residual forms. In addition, the thermodynamic equilibrium calculations showed the volatilization of Ni mainly released Ni3S2 between 800–1100 °C. The H2O atmosphere was favorable to generate the more stable NixSy compound, thereby suppressing the volatilization of Ni, while the presence of CO2 led to an increase in residual V and decrease of Fe-Mn oxides. The V and Ni mainly caused erosion problems under the CO2 atmosphere while the fouling and slagging obviously increased under the H2O atmosphere with impacts gradually weakened with the increase of temperature. View Full-Text
Keywords: high sulfur petcoke; vanadium; nickel; gasification; sequential extraction; migration high sulfur petcoke; vanadium; nickel; gasification; sequential extraction; migration
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Li, W.; Wang, B.; Nie, J.; Yang, W.; Xu, L.; Sun, L. Migration and Transformation of Vanadium and Nickel in High Sulfur Petroleum Coke during Gasification Processes. Energies 2018, 11, 2158.

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