CO₂ Capture by Temperature Swing Adsorption: Use of Hot CO₂-Rich Gas for Regeneration

Abstract

Temperature swing adsorption (TSA) is an attractive technology for CO2 removal from gas streams. CO2 capture by a TSA process in which the recovered CO2 product is heated and used as regeneration purge gas has been examined. Our study is based on cyclic experiments performed on a single adsorption column packed with the commercially available zeolite NaUSY adsorbent. The commercial Aspen adsorption simulator was used to simulate the experimental system, where the model predictions agreed quite well with experimental results in terms of breakthrough and results for cycle designs based on indirect heating followed by hot product gas purge. The validated model was used to simulate the case of regeneration using only hot product gas purge, which was difficult to examine experimentally due to constraints of the experimental system used. With a three-step cycle of (1) adsorption, (2) hot gas purge, and (3) cooling, this case yielded product purities of >91% CO2 and maximum recoveries of 55.5, 76.2, and 83.6% at specific (thermal) energy consumptions of 3.4, 3.8, and 4.5 MJ/kg of CO2 for regeneration temperatures of 150, 200, and 250 °C, respectively. Calculated productivities also varied from 0.024, 0.037, and 0.047 kgCO2 /kgads·h for the various regeneration temperatures. Incorporation of a product CO2 purge prior to desorption with hot CO2 purge gas increased the purity to 96% at a recovery of 90.8%these conditions are suitable for CO2 sequestration.

Simulation of Post‐Combustion CO2 Capture, a Comparison among Absorption, Adsorption and Membranes

“…Mathematical modeling and numerical simulation were often used to predict the performance, the required energy, and the cost of these technologies , . Regarding the absorption process, which includes a recycling stream, one difficulty is to get the model converged.…”

“…An example works with regeneration by indirect heating and purging with concentrated CO 2 . Its performance is fair (76.2 % recovery rate and 91.3 % purity of CO 2 ) with an energy consumption of 3.82 GJ t CO2 −1 .…”

“…An example works with regeneration by indirect heating and purging with concentrated CO 2 . Its performance is fair (76.2 % recovery rate and 91.3 % purity of CO 2 ) with an energy consumption of 3.82 GJ t CO2 -1 [16]. In the present study, we compared the three main CO 2 capture technologies -absorption, adsorption, and membranethat could be used to isolate the CO 2 from the flue gas of an existing coal-fired power plant, in order to recycle it as a feedstock for a chemical process onsite.…”

Adsorption and sequential thermal release of F2, Cl2, and Br2 molecules by a porous organic cage material (CC3‐R): Molecular dynamics and grand‐canonical Monte Carlo simulations

“…These capabilities have led to the development of new, simple, and energy saving technologies such as temperature swing adsorption (TSA). In the TSA technique, the separation of gas molecules is achieved under various temperatures based on their molecular characteristics and affinity of adsorbent materials . These materials are also widely used in air cleaner filters, which play a crucial role in health promotion programs for household, office and industry uses .…”

“…In the TSA technique, the separation of gas molecules is achieved under various temperatures based on their molecular characteristics and affinity of adsorbent materials. [6][7][8][9] These materials are also widely used in air cleaner filters, which play a crucial role in health promotion programs for household, office and industry uses. [10,11] Among new types of micro and nanoporous compounds, [12,13] porous organic cages (POC) has attracted considerable attention over the past few years by reason of their unique and special features.…”