Paper No. 182: Post-combustion CO2 Capture by Solvent Theoretical Definition of the Optimum T-Profile for Absorber

Zhen Fan, Kunlei Liu

Research output: Contribution to conferencePaperpeer-review

Abstract

Post-combustion CO2 capture (PCC) through gas-liquid absorption is currently considered as the most viable technology available for a commercial scale power plant application. One of the major limitations to the implementation of post-combustion CO2 capture technology is the capital and the operation cost. Absorber column enhancement by applying the desired temperature profile through intercooling (including inter-heating) has been considered as one of the methods for improvement of carbon loading in rich solvent, and subsequently for reduction of the energy penalty and/or the absorber column height and capital cost. For some solvents such as PZ, the gain from intercooling is significant, reducing not only the circulation rate of solvent, but also the heat requirement of solvent regeneration or the number of stages required to reach the specified CO2 capture efficiency. The absorber performance is determined thermodynamically by the absorption kinetics of chemical reaction, the reaction enhanced mass transfer rate, and the equilibrium tendency in column in addition to the heat mitigation. From one perspective a relatively high operation temperature is desired to obtain fast kinetics and absorption rate, while on the other hand a low temperature is preferred to increase the CO2 loading and thus the solvent capacity. This leads to an investigation of the desired or the optimum absorber temperature profile at which the absorption rate will reach its maximum at all stages in column, and of the method to reach such an optimum T-profile through application of intercooling or in-column heat removal. The present paper presents a method aiming at defining the optimum T-profile, which can eventually progress toward a goal of the potential ultimate gain from a proper arrangement of intercooling.

Original languageEnglish
StatePublished - 2018
Event14th International Conference on Greenhouse Gas Control Technologies, GHGT 2018 - Melbourne, Australia
Duration: Oct 21 2018Oct 25 2018

Conference

Conference14th International Conference on Greenhouse Gas Control Technologies, GHGT 2018
Country/TerritoryAustralia
CityMelbourne
Period10/21/1810/25/18

Bibliographical note

Publisher Copyright:
© 2018 GHGT 2018 - 14th International Conference on Greenhouse Gas Control Technologies. All rights reserved.

Funding

This work was supported by the Carbon Management Research Group (CMRG): Louisville Gas and Electric & Kentucky Utilities (LGE&KU), Duke Energy, Kentucky Department for Energy Development and Independence (KY DEDI), and the Electric Power Research Institute, Inc. (EPRI).

FundersFunder number
Kentucky Department for Energy Development and Independence
Louisville Gas and Electric and Kentucky Utilities
Duke Energy
Electric Power Research Institute, Louisville Gas & Electric

    Keywords

    • Absorption
    • CO removal
    • Intercooling
    • MDEA
    • MEA
    • Optimum absorber T-profile

    ASJC Scopus subject areas

    • Industrial and Manufacturing Engineering
    • Management, Monitoring, Policy and Law
    • Pollution
    • General Energy

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