TY - JOUR
T1 - Effects of slag compositions on the rate of methane-steam reaction
AU - Shimada, T.
AU - Kochura, V.
AU - Akiyama, T.
AU - Kasai, E.
AU - Yagi, J.
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2001
Y1 - 2001
N2 - For the effective heat recovery from molten slag by utilizing a chemical reaction, rates of the methane-steam reaction on the slag surface were studied for thirteen slag samples, in which effects of mass ratio of CaO to SiO2 (CaO/SiO2 ratio), and concentrations of wustite (FeO) and sulfur in slag on the reaction rate were systematically examined in the slag temperature range from 1473 to 1823 K. The results showed that the higher CaO/SiO2 ratio, meaning the weaker network structure of molten slag, gives rise to the higher rate of methane-steam reaction. In contrast, the FeO addition to slag brings about the lower reaction rate than that for the slag without FeO, indicating the inhibitory effect of FeO on the reaction. The higher FeO concentration proportionally provides the stronger inhibitory effect over the slag temperature of 1773 K, while it is independent on both of the slag temperature and the FeO concentration under the temperature of 1673 K. The results also revealed that the sulfur contained in slag has the inhibitory effect on the methane-steam reaction, which is much larger than the equi-mass of FeO over 1673 K. This inhibitory effect of sulfur increases with increasing the sulfur concentration from 0.5 to 1.0 mass%, whereas it is insignificantly enhanced by the further increase in the sulfur concentration.
AB - For the effective heat recovery from molten slag by utilizing a chemical reaction, rates of the methane-steam reaction on the slag surface were studied for thirteen slag samples, in which effects of mass ratio of CaO to SiO2 (CaO/SiO2 ratio), and concentrations of wustite (FeO) and sulfur in slag on the reaction rate were systematically examined in the slag temperature range from 1473 to 1823 K. The results showed that the higher CaO/SiO2 ratio, meaning the weaker network structure of molten slag, gives rise to the higher rate of methane-steam reaction. In contrast, the FeO addition to slag brings about the lower reaction rate than that for the slag without FeO, indicating the inhibitory effect of FeO on the reaction. The higher FeO concentration proportionally provides the stronger inhibitory effect over the slag temperature of 1773 K, while it is independent on both of the slag temperature and the FeO concentration under the temperature of 1673 K. The results also revealed that the sulfur contained in slag has the inhibitory effect on the methane-steam reaction, which is much larger than the equi-mass of FeO over 1673 K. This inhibitory effect of sulfur increases with increasing the sulfur concentration from 0.5 to 1.0 mass%, whereas it is insignificantly enhanced by the further increase in the sulfur concentration.
KW - FeO
KW - Heat recovery
KW - Mass ratio of CaO to SiO
KW - Methane-steam reaction
KW - Molten slag
KW - Slag composition
KW - Sulfur
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U2 - 10.2355/isijinternational.41.111
DO - 10.2355/isijinternational.41.111
M3 - Article
AN - SCOPUS:0035059657
VL - 41
SP - 111
EP - 115
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
SN - 0915-1559
IS - 2
ER -