Abstract
A mathematical model of a continuous moving-bed temperature-swing adsorption (MBTSA) process for post-combustion CO2 capture in a coal-fired power plant context has been developed. Process simulations have been done using single component isotherms and measured gas diffusion parameters of an activated carbon adsorbent. While a simple process configuration with no gas re-circulation gives quite low capture rate and CO2 purity, 86% and 65%, respectively, more advanced process configurations where some of the captured gas is recirculated to the incoming flue gas drastically increase both the capture rate and CO2 purity, the best configuration reaching capture rate of 86% and CO2 purity of 98%. Further improvements can be achieved by using adsorbents with higher CO2/N2 selectivity and/or higher temperature of the regeneration section.
Highlights
The use of solid adsorbents is an alternative approach that may alleviate many of the problems connected to the liquid absorption processes
We present results from moving-bed temperature-swing adsorption (MBTSA) process modelling using activated carbon using the MBTSA process in a post-combustion NGCC context [10]
temperature swing adsorption (TSA) process, where the adsorbent is packed in columns alternating betweenDifferently feed and regeneration mode, in a moving process the adsorbent is moving through from a conventional process, bed where the adsorbent is packed in columns alternating between feed and regeneration mode, in a moving bed process the adsorbent is moving different sections, each of which having a specific function
Summary
The use of solid adsorbents is an alternative approach that may alleviate many of the problems connected to the liquid absorption processes. It was decided to operate the preheating section in a similar manner to the desorption section, in which the gas flows downwards (co-currently to the sorbent) and is withdrawn at the bottom of the column by applying a slight vacuum. A series of simulations were performed for Conf-B, by varying the length of the pre-heating section in order to investigate the effect of such design parameter on the process performances. Since the gas is extracted by applying slight vacuum at the outlet of the pre-heating section (bottom), the longest the section, the largest is the amount of gas extracted, and the lowest is the CO2 recovery
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