Quantitative Evaluation of CO₂ Emission Reduction of Active Carbon Recycling Energy System for Ironmaking by Modeling with Aspen Plus

Abstract

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.

A Mechanism Model for Accurately Estimating Carbon Emissions on a Micro Scale of Iron-making System

“…12) Katsuki Suzuki used the chemical simulator of Aspen Plus to develop a process flow diagram of blast furnace model with iACRES for quantitative predictions on the CO 2 emission and the exergy under the law of mass and energy conservation. 13) An analogous numerical model was employed to evaluate the feasibility of the carbon recycling process and the reduction of carbon dioxide in the shaft furnace with iACRES. 14) Some new metallurgical approaches such as the nuclear hydrogen steel-making process with VHTR-IS and the low reducing agent operation conditions of blast furnaces were proved effective on mitigating and reducing the carbon emissions via establishing and using various mathematic model such as the process flow model, flow sheet model and DEM-CFD (Discrete Element Method -Computational Fluid Dynamics) model, under the law of mass and energy conservation.…”

Process Evaluation of Use of High Temperature Gas-cooled Reactors to an Ironmaking System Based on Active Carbon Recycling Energy System

“…HM production rate per BF was determined as 1.22×10 -1 t-HM/s (identical to 3.83×10 3 kt-HM/y) assuming a large scale BF as for Japan of inner volume of 5 000 m 3 and relatively high productivity of 2.1 t-HM/(d•m 3 ). 10) Coking coal input and CO2 emissions were evaluated to show effects of iACRES using HTGRs. Heat and electricity demands in the SOEC, IS process and RWGS modules were…”

“…Coking coal input reduction a) Determined by relatively high productivity (2.1 t-HM/(d•m 3 )) of standard large scale BFs (inner volume 5 000 m 3 ) in Japan in Ref. 10) . b) Higher heating value c) Result of this study ratio was the same as the one of coke input because the coking coal input amount was proportional to the coke input.…”

“…Electricity of 35 a) HM of 1.22×10 -1 t-HM/s is produced per BF. 10) b) Heat for CO2 separation is supplied from waste heat in the BF module. c) Heat for CO2 separation and excess electricity are not included.…”

Integrated Pyrolysis–Tar Decomposition over Low-Grade Iron Ore for Ironmaking Applications: Effects of Coal–Biomass Fuel Blending

“…In modern blast furnace operation (typical case in Japan), 385 kg of coke per ton of hot metal is needed, while 112 kg of pulverized coal per ton of hot metal is injected . For every ton of coke produced, around 1.6 tons of coking coal is used .…”