Thermodynamic effects of calcium and iron oxides on crystal phase formation in synthetic gasifier slags containing from 0 to 27 wt.% V2O3

FUEL

卷:161

Article

Nakano, Jinichiro^1,2  Duchesne, Marc³  Bennett, James¹  Kwong, Kyei-Sing¹  Nakano, Anna¹  Hughes, Robin³ 

[1] Natl Energy Technol Lab, US Dept Energy, Albany, OR 97321 USA

[2] URS Corp, Albany, OR 97321 USA

[3] CanmetENERGY, Nat Resources Canada, Ottawa, ON K1A 1M1, Canada

关键词: Phase diagram;    Equilibrium;    Coal;    Petroleum coke;    Additive agents;   

DOI  :  10.1016/j.fuel.2014.11.008

来源: Elsevier

【 摘 要 】

Thermodynamic phase equilibria in synthetic slags (Al2O3-CaO-FeO-SiO2-V2O3) were investigated with 0-27 wt.% vanadium oxide corresponding to industrial coal-petroleum coke (petcoke) feedstock blends in a simulated gasifier environment. Samples encompassing coal-petcoke mixed slag compositions were equilibrated at 1500 degrees C in a 64 vol.% CO/36 vol.% CO2 atmosphere (Po-2 approximate to 10(-8) atm at 1500 degrees C) for 72 h, followed by rapid water quench, then analyzed by inductively coupled plasma optical emission spectrometry, X-ray diffractometry, and scanning electron microscopy with wavelength dispersive spectroscopy. With increasing CaO content, FeO content, or both; the slag homogeneity region expanded and a composition range exhibiting crystals was reduced. The mullite (AI(6)Si(2)O(13)) crystalline phase was not present in the slags above 9 wt.% FeO while the karelianite (V2O3) crystalline phase was always present in compositions studied if a sufficient amount of vanadium existed in the slag. Based on the present experimental equilibrium evaluation, a set of isothermal phase diagrams showing effects of CaO and FeO on thermodynamic phase stabilities in the vanadium-bearing slags is proposed. Some uses of the diagrams for potential industrial practice are discussed. Published by Elsevier Ltd.

【 授权许可】

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