Abstract
The steel industry generates 7–9 % of the world’s anthropogenic carbon emissions. Carbon capture, utilization, and storage (CCUS) technologies for low carbon emissions from the steel industry have attracted research attention. Chemical absorption is the most mature and widely used carbon capture method, and reducing the energy consumption of this technology is currently a research hotspot. This work focused on the development of amine blends suitable for carbon capture in a top gas recycling-oxygen blast furnace (TGR-OBF) for low-carbon steelmaking and further reduction of carbon emissions. The effects of piperazine (PZ) and its derivatives on methyldiethanolamine (MDEA) activation were explored. PZ and 2-(piperazin-1-yl)ethanamine (AEP) most significantly activated MDEA. The best absorption and regeneration performance was achieved with aqueous amine solutions at the MDEA:PZ and MDEA:AEP ratios of 5:3 and 1:1, respectively. Blast furnace gas is rich in CO, and we verified that CO does not significantly affect the overall performance of the aqueous amine solution. The maximum absorption rate of the developed MAA absorbent was similar to that of 30 wt% monoethanolamine (MEA), and at 20 % and 35 % CO2, the cyclic capacities were 1.57 and 1.47 times greater than that of 30 wt% MEA, while the maximum regeneration rates were 2.13 and 1.92 times greater than those of 30 wt% MEA, respectively. A bench-scale CO2 capture experiment performed at a flow rate of 4 Nm3/h verified the scale-up application potential of the absorbent. The regeneration energy of MAA under the optimal operating conditions was 2.86 GJ/ton CO2, which was 28.5 % lower than that of 30 wt% MEA. Moreover, MAA displayed a lower latent heat and lower reaction heat. The developed MAA absorbent has great adaptability and low regeneration energy and is expected to be applied in the steel industry to effectively reduce blast furnace carbon emissions.
Published Version
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