(687e) Comparison of Various Technological Options in a Smr-Hydrogen Plant in Refineries for Supplying CO2 Feedstock to Combined Reforming and Dry Reforming of Methane Based CO2 Conversion Processes

Authors: 
Lee, J. H., Korea Advanced Institute of Science and Technology (KAIST)
Ga, S., Korea Advanced Institute of Science and Technology (KAIST)
Roh, K., Korea Advanced Institute of Science and Technology (KAIST)

Combined
reforming (CR) and dry reforming (DR) of methane are two of the most promising
CO2 conversion reactions for utilizing concentrated CO2 as
a feedstock to produce syngas, which is used in various applications like
liquid fuel synthesis.[1,2] In order to make these conversion processes more
economically attractive, it is important to procure CO2 feed as
cheaply as possible. Steam methane reforming (SMR) based hydrogen pl ant in
typical refineries is a suitable CO2 emission source to target for
this because there are process streams containing CO2 at high partial
pressure, giving potentials for an acceptably low CO2 avoidance cost
($/ton of CO2).[3] The aim of this study is to compare various processing
options for removing CO2 in a SMR-H2 plant and supplying
it to the two CO2 conversion processes, employing the combined
reforming and dry reforming of methane, respectively. As the technological candidates,
three CO2 capture technologies applied to the H2
purification unit upstream are considered: physical absorption (1-stage
Selexol), chemical absorption (activated MDEA), and adsorption (Vacuum Swing
Adsorption). In addition, the applicability of directly feeding the a CO2
containing output stream of the H2 purification into the CO2
conversion processes is examined, an option that does not require any CO2
capture facility. Methanol and long-chain hydrocarbons are selected as final
products of the CR based and the DR based CO2 conversion processes
respectively because they guarantee the suitable syngas conditions for
synthesizing the targeted products. Mass and energy balance information of each
process is obtained by a commercial process simulator Aspen plus¢ç. To analyze the economic
feasibility of each technological option, operating and capital costs are
evaluated.

Figure 1. Four different strategies (three CO2 capture
options & process stream direct use) for integrating the H2
plant with CO2 conversion processes

Reference

[1] Olah,
G. A.; Goeppert, A.; Prakash, G. S., Beyond oil and gas: the methanol economy.
John Wiley & Sons: 2009.

[2] Gadalla,
A. M.; Bower, B., The role of catalyst support on the activity of nickel for
reforming methane with CO2. Chemical Engineering Science 1988, 43
(11), 3049-3062

[3] Soltani,
R.; Rosen, M. A.; Dincer, I., Assessment of CO2 capture options from
various points in steam methane reforming for hydrogen production.
International Journal of Hydrogen Energy 2014, 39 (35), 20266-20275