| Abstract
| - The performance of amine absorption technologies developed for iron works is evaluated for two base cases,conventional blast furnace top gas and nitrogen free blast furnace top gas with shaft injection. The studyincludes well-known absorbents like monoethanolamine (MEA) and methyldiethanolamine (MDEA)/piperazine,as well as 2-amino-2-methyl-1-propanol (AMP). A rate-based closed-loop model was developed for AMPbased on a previously developed rigorous model. For the AMP model, equilibrium data have been obtainedin our own laboratories. Simulations show that it is very favorable with intercooling of the absorber. Insertinga precooler at the gas inlet to the absorber does not cause significant operational cost improvements. Forhigher piperazine activator concentrations, up to 20 wt % Pz, lower regeneration duties as well as lowercirculation rates are achieved. A comparison between the amines shows that the AMP is most energy efficient,followed by MDEA/Pz and MEA. By combining the best amine with process intercooling, a heat requirementof only 2.2 MJ/(ton of CO2 recovered) is possible for treatment of conventional blast furnace top gas.
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