Carbon Recycling for Reduction of Carbon Dioxide Emission from Iron-making Process

Kato, Yukitaka

doi:10.2355/isijinternational.50.181

Cited by 39 publications

(26 citation statements)

References 7 publications

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“…nuclear energy by high-temperature gas-cooled reactor or renewable energy by solar and wind power. 1,2) Conventional catalytic reduction of CO2 to CO and various chemicals using solid catalysts have been reported. For example, Mitsui Chemical Co. in Japan has been already developed a new process of methanol synthesis form CO2 and H2 at 673 K by a solid catalyst, Cu and Zn oxide modified catalyst.…”

Section: Introductionmentioning

confidence: 99%

Electroreduction of Carbon Dioxide to Carbon Monoxide by Co-pthalocyanine Electrocatalyst under Ambient Conditions

et al. 2015

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Electrochemical reduction of carbon dioxide using a gas-electrolysis cell reactor was studied. A new electrocatalyst has been screened and Co-phthalocyanine (Co-Pc) supported on carbon support was found to reduce CO2 to CO. Effects of reaction conditions on a formation rate of CO and a selectivity to CO corresponding to a current efficiency (CE) were studied. Loadings of Co-Pc, kinds of carbon materials as a support, reaction temperatures and cathode potentials strongly affected the performance of the electroreduction of CO2 to CO. A maximum CE to CO formation was achieved to 70% with 14 mA cm -2 by use of 0.1 wt% Co-Pc supported vapor-grown-carbon-fiber (VGCF) electrocatalyst at -0.90 V (Ag/AgCl) and 273 K. The reaction model of electroreduction of CO2 was proposed in this work.

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Section: Introductionmentioning

confidence: 99%

Electroreduction of Carbon Dioxide to Carbon Monoxide by Co-pthalocyanine Electrocatalyst under Ambient Conditions

et al. 2015

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“…The CO is recycled to the blast furnace and used for the reduction of iron oxides into pig iron. The trial introduction of ACRES 3,4) and unit operations for CO 2 reduction, such as those using solid oxide electrolysis cells (SOECs) 5) and reverse watergas shift reactors (RWGSs), have already been reported. However, quantitative evaluation and discussion of iACRES has not yet been performed.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Evaluation of CO<sub>2</sub> Emission Reduction of Active Carbon Recycling Energy System for Ironmaking by Modeling with Aspen Plus

et al. 2015

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The use of the Active Carbon Recycling Energy System in ironmaking (iACRES) has been proposed for reducing CO2 emissions. To evaluate the performance of iACRES quantitatively, a process flow diagram of a blast furnace model with iACRES was developed using Aspen Plus, a chemical process simulator. The CO2 emission reduction and exergy analysis was predicted by using the mass and energy balance obtained from the simulation results. iACRES used a solid oxide electrolysis cell (SOEC) with CO2 capture and separation (CCS), an SOEC without CCS, and a reverse water-gas shift reactor as the CO2 reduction reactor powered by a high-temperature gas-cooled reactor. iACRES could provide a CO2 emission reduction of 3-11% by recycling carbon monoxide and hydrogen, whereas the effective exergy ratio decreased in all cases.

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“…Although some strategies for the separation and reduction of CO2 in the exhaust gas from the process have been proposed recently as shown in Fig. 1, 1,2) another energy source for the separation and reduction of CO2 is required. For stable and economic operation, effective use of waste heat from the iron and steel making process, in particular thermal energy storage, is necessary.…”

Section: Introductionmentioning

confidence: 99%

Performance of a Novel Steam Generation System Using a Water-zeolite Pair for Effective Use of Waste Heat From the Iron and Steel Making Process

et al. 2015

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To reduce CO2 emission from the iron and steel making process, a novel steam generation system using waste hot water is proposed to use waste heat effectively from the process. This system adopts a direct heat exchange method for the adsorption heat pump to increase the heat transfer rate between the adsorbent and heat transfer fluid. In this study, the performance of the system is evaluated according to the mass of steam generated during the cyclic operation. The regeneration process is first studied taking the transport phenomena in the generator into account. The mass of steam generated is then estimated based on the distributions of water content and temperature in the generator. The results from the model exhibit good agreement with the experimental results. The effect of the operating conditions on the performance of the steam generation process is studied. It was found that there was an appropriate regeneration time to maximize the mass of steam generated during the cycle. For the effective use of adsorption heat, reuse of the water drained from the steam generation process (Drainage Recycling) is proposed. As a result, recycling the drainage water is a practical and helpful method to improve the performance of the system. KEY WORDS: effective use of waste heat; steam generation; adsorption heat pump; numerical.

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Carbon Recycling for Reduction of Carbon Dioxide Emission from Iron-making Process

Cited by 39 publications

References 7 publications

Electroreduction of Carbon Dioxide to Carbon Monoxide by Co-pthalocyanine Electrocatalyst under Ambient Conditions

Electroreduction of Carbon Dioxide to Carbon Monoxide by Co-pthalocyanine Electrocatalyst under Ambient Conditions

Quantitative Evaluation of CO<sub>2</sub> Emission Reduction of Active Carbon Recycling Energy System for Ironmaking by Modeling with Aspen Plus

Performance of a Novel Steam Generation System Using a Water-zeolite Pair for Effective Use of Waste Heat From the Iron and Steel Making Process

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