Modeling of Blast Furnace CO2 Capture Using Amine Absorbents

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 study includes well-known absorbents like monoethanolamine (MEA) and methyldiethanolamine (M...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2007-11, Vol.46 (23), p.7811-7819
Main Authors: Tobiesen, Finn Andrew, Svendsen, Hallvard F, Mejdell, Thor
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
Online Access:Get full text
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Summary: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 study includes 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 AMP based on a previously developed rigorous model. For the AMP model, equilibrium data have been obtained in our own laboratories. Simulations show that it is very favorable with intercooling of the absorber. Inserting a precooler at the gas inlet to the absorber does not cause significant operational cost improvements. For higher piperazine activator concentrations, up to 20 wt % Pz, lower regeneration duties as well as lower circulation 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 requirement of only 2.2 MJ/(ton of CO2 recovered) is possible for treatment of conventional blast furnace top gas.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie061556j