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Romano M. C. - One of the best experts on this subject based on the ideXlab platform.
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Integration of a fluidised bed Ca-Cu chemical looping process in a steel mill
'Elsevier BV', 2019Co-Authors: Martínez Berges Isabel, Fernández García, José Ramón, Abanades García, Juan Carlos, Romano M. C.Abstract:5 figures, 4 tables, appendix.-- © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/An integrated full system to decarbonise a steelworks plant is discussed, using high temperature Ca–Cu chemical looping reactions. A H2-enriched gas is produced through sorption enhanced water-gas-shift (SEWGS) of blast furnace gas (BFG) using a CaO-based CO2 sorbent. The resulting CaCO3 is regenerated with heat from CuO reduction with N2-free steel mill off-gases. The high temperature operation allows for an effective integration of a power steam cycle that replaces the steel mill power plant. The proposed fluidised-bed process facilitates a solids segregation step to separate the O2 solid carrier from the CO2 sorbent. The CaO-rich stream separated could be used in the steelmaking process thereby removing the lime plant. Balances of a steel mill integrated with the Ca–Cu process are solved and compared with those obtained for a reference steelworks plant with post-combustion CO2 capture through amine absorption. Using exclusively steel mill off-gases in the Ca–Cu process can reduce CO2 emissions by 30%. Moreover, the H2-gas could produce about 10% of additional Iron through a Direct Reduced Iron process. In contrast, by adding natural gas for CuO reduction, almost all the BFG can be decarbonised and an overall CO2 capture efficiency in the steel plant of 92% can be achieved.Authors acknowledge the financial support from the European Union Seventh Frame Programme FP7 under the project ASCENT (Grant agreement no. 608512).Peer Reviewe
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Integration of a fluidised bed Ca–Cu chemical looping process in a steel mill
Elsevier, 2019Co-Authors: Martínez Berges Isabel, Fernández García, José Ramón, Abanades García, Juan Carlos, Romano M. C.Abstract:An integrated full system to decarbonise a steelworks plant is discussed, using high temperature Ca–Cu chemical looping reactions. A H2-enriched gas is produced through sorption enhanced water-gas-shift (SEWGS) of blast furnace gas (BFG) using a CaO-based CO2 sorbent. The resulting CaCO3 is regenerated with heat from CuO reduction with N2-free steel mill off-gases. The high temperature operation allows for an effective integration of a power steam cycle that replaces the steel mill power plant. The proposed fluidised-bed process facilitates a solids segregation step to separate the O2 solid carrier from the CO2 sorbent. The CaO-rich stream separated could be used in the steelmaking process thereby removing the lime plant. Balances of a steel mill integrated with the Ca–Cu process are solved and compared with those obtained for a reference steelworks plant with post-combustion CO2 capture through amine absorption. Using exclusively steel mill off-gases in the Ca–Cu process can reduce CO2 emissions by 30%. Moreover, the H2-gas could produce about 10% of additional Iron through a Direct Reduced Iron process. In contrast, by adding natural gas for CuO reduction, almost all the BFG can be decarbonised and an overall CO2 capture efficiency in the steel plant of 92% can be achieved.Authors acknowledge the financial support from the European Union Seventh Frame Programme FP7 under the project ASCENT (Grant agreement no. 608512).Peer Reviewe
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Integration of a fluidised bed Ca–Cu chemical looping process in a steel mill
'Elsevier BV', 2018Co-Authors: Fernández J. R., Abanades J. C., Romano M. C.Abstract:An integrated full system to decarbonise a steelworks plant is discussed, using high temperature Ca–Cu chemical looping reactions. A H2-enriched gas is produced through sorption enhanced water-gas-shift (SEWGS) of blast furnace gas (BFG) using a CaO-based CO2 sorbent. The resulting CaCO3 is regenerated with heat from CuO reduction with N2-free steel mill off-gases. The high temperature operation allows for an effective integration of a power steam cycle that replaces the steel mill power plant. The proposed fluidised-bed process facilitates a solids segregation step to separate the O2 solid carrier from the CO2 sorbent. The CaO-rich stream separated could be used in the steelmaking process thereby removing the lime plant. Balances of a steel mill integrated with the Ca–Cu process are solved and compared with those obtained for a reference steelworks plant with post-combustion CO2 capture through amine absorption. Using exclusively steel mill off-gases in the Ca–Cu process can reduce CO2 emissions by 30%. Moreover, the H2-gas could produce about 10% of additional Iron through a Direct Reduced Iron process. In contrast, by adding natural gas for CuO reduction, almost all the BFG can be decarbonised and an overall CO2 capture efficiency in the steel plant of 92% can be achieved
Andrew R. Barron - One of the best experts on this subject based on the ideXlab platform.
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pyrometallurgical removal of zinc from basic oxygen steelmaking dust a review of best available technology
Resources Conservation and Recycling, 2020Co-Authors: Daniel J C Stewart, Andrew R. BarronAbstract:Abstract Approximately 20 kg of dust and sludges are produced per ton of liquid steel produced via the blast furnaces (BF)/basic oxygen furnace (BOF) production route. Many of these dusts are recycled through the sinter plant or blast furnace route without issue, but high zinc content dusts are routinely landfilled. Hydrometallurgical techniques, such as alkaline leaching, that are often utilized to remove zinc from electric arc furnace dusts are inappropriate for recovery of material from BOS dust due to the lower zinc concentration present and extra post-processing steps to utilize the separated Iron product. Pyrometallurgical treatment through a rotary hearth furnace (RHF), in processes such as FASTMET®, can currently be considered as the most commercially attractive option for the processing and recovery of Iron and zinc units when employed as part of an integrated steelworks. The crude zinc oxide produced is suitable for sale to zinc smelters, and the direct reduced Iron produced provides process benefits through use, such as reduced blast furnace coking rates and increased productivity. The advantages and disadvantages of variations and alternatives are reviewed with regard to future developments.
Martínez Berges Isabel - One of the best experts on this subject based on the ideXlab platform.
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Integration of a fluidised bed Ca–Cu chemical looping process in a steel mill
Elsevier, 2019Co-Authors: Martínez Berges Isabel, Fernández García, José Ramón, Abanades García, Juan Carlos, Romano M. C.Abstract:An integrated full system to decarbonise a steelworks plant is discussed, using high temperature Ca–Cu chemical looping reactions. A H2-enriched gas is produced through sorption enhanced water-gas-shift (SEWGS) of blast furnace gas (BFG) using a CaO-based CO2 sorbent. The resulting CaCO3 is regenerated with heat from CuO reduction with N2-free steel mill off-gases. The high temperature operation allows for an effective integration of a power steam cycle that replaces the steel mill power plant. The proposed fluidised-bed process facilitates a solids segregation step to separate the O2 solid carrier from the CO2 sorbent. The CaO-rich stream separated could be used in the steelmaking process thereby removing the lime plant. Balances of a steel mill integrated with the Ca–Cu process are solved and compared with those obtained for a reference steelworks plant with post-combustion CO2 capture through amine absorption. Using exclusively steel mill off-gases in the Ca–Cu process can reduce CO2 emissions by 30%. Moreover, the H2-gas could produce about 10% of additional Iron through a Direct Reduced Iron process. In contrast, by adding natural gas for CuO reduction, almost all the BFG can be decarbonised and an overall CO2 capture efficiency in the steel plant of 92% can be achieved.Authors acknowledge the financial support from the European Union Seventh Frame Programme FP7 under the project ASCENT (Grant agreement no. 608512).Peer Reviewe
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Integration of a fluidised bed Ca-Cu chemical looping process in a steel mill
'Elsevier BV', 2019Co-Authors: Martínez Berges Isabel, Fernández García, José Ramón, Abanades García, Juan Carlos, Romano M. C.Abstract:5 figures, 4 tables, appendix.-- © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/An integrated full system to decarbonise a steelworks plant is discussed, using high temperature Ca–Cu chemical looping reactions. A H2-enriched gas is produced through sorption enhanced water-gas-shift (SEWGS) of blast furnace gas (BFG) using a CaO-based CO2 sorbent. The resulting CaCO3 is regenerated with heat from CuO reduction with N2-free steel mill off-gases. The high temperature operation allows for an effective integration of a power steam cycle that replaces the steel mill power plant. The proposed fluidised-bed process facilitates a solids segregation step to separate the O2 solid carrier from the CO2 sorbent. The CaO-rich stream separated could be used in the steelmaking process thereby removing the lime plant. Balances of a steel mill integrated with the Ca–Cu process are solved and compared with those obtained for a reference steelworks plant with post-combustion CO2 capture through amine absorption. Using exclusively steel mill off-gases in the Ca–Cu process can reduce CO2 emissions by 30%. Moreover, the H2-gas could produce about 10% of additional Iron through a Direct Reduced Iron process. In contrast, by adding natural gas for CuO reduction, almost all the BFG can be decarbonised and an overall CO2 capture efficiency in the steel plant of 92% can be achieved.Authors acknowledge the financial support from the European Union Seventh Frame Programme FP7 under the project ASCENT (Grant agreement no. 608512).Peer Reviewe
Jian Chen - One of the best experts on this subject based on the ideXlab platform.
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Direct reduction of oxidized Iron ore pellets using biomass syngas as the reducer
Fuel Processing Technology, 2016Co-Authors: Dabin Guo, Baihui Cui, Shipeng Luo, Caifeng Ma, Liandong Zhu, Mahmood Laghari, Sheng Guo, Zhihua Chen, Yan Zhou, Jian ChenAbstract:The syngas derived from a pyrolysis and gasification process was used as a reducing agent to produce Iron ore pellets. The reduction temperature was kept between 1123 K and 1323 K, and the time was set 30 min. Results showed that the reducibility increased from 88.1% at 1123 K to 99.95% at 1323 K. The reduction rate increased with increasing reduction temperature. Further, the reaction rate in the early stage was higher than that in the later stage. The X-ray diffraction (XRD) and metallographic microscope analyses of the oxidized pellets and direct reduced Iron (DRI) products showed that, the reduction process followed the reaction scheme: Fe2O3 → FeO → Fe. A kinetics analysis indicated that, the reduction rate was controlled by an interfacial chemical reaction with syngas and that the activation energy was 104.76 kJ/mol. The effect of syngas as the reducing gas on the reduction of Iron ore pellets was similar to that of natural gas. The use of biomass during DRI production can eliminate CO2 emissions, energy crisis, and climate change.
Mansoor Barati - One of the best experts on this subject based on the ideXlab platform.
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Role of Heat Transfer in Early Stage Decarburization of DRI in Slag
Metallurgical and Materials Transactions B, 2012Co-Authors: Mansoor Barati, Erfan SharifiAbstract:The gas generation from reactions between direct reduced Iron (DRI) pellets and steelmaking slags is known to take place in two stages; (1) the reaction of FeO and carbon within DRI, i.e. , pellet internal reaction, followed by (2) the reduction of slag FeO with DRI carbon at the pellet–slag interface, if any carbon remains from the first step. To understand the controlling mechanism of the reaction between FeO and C inside DRI, the rate of the gas release and the temperature of pellets suspended in a slag-free atmosphere were quantified. The results were used to determine the apparent thermal conductivity of DRI that showed values of approximately 0.5 to 2 W.m^−1.K^−1 for a temperature range of 573 K to 1273 K (300 °C to 1000 °C). Furthermore, it was found that the experimental gas evolution rates are consistent with the values predicted by a heat–transfer based model, confirming that the FeO-C reaction within pellet is controlled by the rate of heat transfer from the slag to the DRI pellet.
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the reaction behavior of direct reduced Iron dri in steelmaking slags effect of dri carbon and preheating temperature
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2010Co-Authors: Erfan Sharifi, Mansoor BaratiAbstract:An experimental study was conducted to quantify the rate of direct reduced Iron (DRI) decarburization in a steelmaking slag using the constant volume pressure increase technique. Experiments were conducted by dropping DRI pellets into molten slag at temperatures from 1773 K to 1873 K (1500 °C to 1600 °C). Subsequent experiments were carried out in which the DRI pellets were preheated while the slag temperature remained constant. The effect of the initial carbon content and the preheating temperature of the DRI on the reaction rate was investigated. The decarburization of DRI seems to comprise two stages, a reaction between the FeO and DRI followed by decarburization through the Iron oxide of slag. Carbon has a significant effect on the kinetics of both stages, whereas the preheating temperature mainly influences the rate of decarburization between FeO and carbon inside the pellet.
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Kinetics and Mechanism of Decarburization and Melting of Direct-Reduced Iron Pellets in Slag
Metallurgical and Materials Transactions B, 2009Co-Authors: Mansoor BaratiAbstract:An experimental study was conducted to understand the decarburization and melting behavior of Direct-Reduced Iron (DRI) pellets in SiO_2-Al_2O_3-CaO-MgO-FeO slags with various FeO concentrations (10 to 25 wt pct) and basicities (Bs), ranging from 1.5 to 2.5. The behavior of the pellet in slag was observed using the X-ray fluoroscopy technique; the rate of decarburization was simultaneously measured with a constant volume pressure increase technique. The study shows that the decarburization of DRI in slag at 1600 °C takes place in two stages. The first stage is the reaction between the FeO and the carbon inside the pellet, which is controlled by heat transfer from the slag to the pellet; the second stage involves the decarburization reaction between the FeO in the slag and the remaining carbon in the DRI. The kinetics of this stage is determined by the mass transfer of FeO in the slag and is strongly dependent on the FeO concentration. Depending on the physicochemical properties of the slag and the rate of gas evolution, the DRI may sink through, float inside the slag, or remain on top before complete decarburization.