CO₂ Capture on an Adsorbent-Coated Finned Tube Heat Exchanger: Effect of the Adsorbent Thickness

Abstract

The reduction of cycle time is crucial to obtain viable adsorptive CO 2 capture processes. In thermal swing adsorption processes, heating and cooling of the adsorbent result in long cycle times. In the present paper, the adsorbent was coated on a finned heat exchanger tube to reduce the heating and cooling times. The effect of the adsorbent/exchanger mass ratio on the regeneration time and energy efficiency of CO 2 adsorption and desorption were investigated. To do so, finned tubes were coated by three different masses of 13X powder and were used in an indirect-heating system for CO 2 sorption. Increasing the loaded adsorbent mass density from 58.5 to 215.7 g/m 2 did not affect the CO 2 sorption rate. This is because of the short characteristic time of heat diffusion due to the limited spacing between the adjacent fins. Energy analysis of the system shows that the energy consumed per mole of desorbed CO 2 decreases with increasing adsorbent mass. The maximum energy efficiency is less than 3%.

Shaping techniques of adsorbents and their applications in gas separation: a review

“…101–104 This method generally brings about more uniform coating films. Up to now, various types of adsorbents have been coated to substrates, including zeolites, 105 alumina, 106 silica, 107 carbon, 101,108 carbonate, 109 metal–organic frameworks, 110 clay, 111 organic polymers, 112 and so on. The commonly used substrates are ceramic honeycombs, 113,114 metal honeycombs, 115,116 fiber paper, 107 and polymer monoliths.…”

“…Besides, the coating was proven to be hydrophobic and have a strong viscosity, so it can be used for a long time. Esmaeili et al 105 used acrylic latex emulsion as a binder to coat 13X powder on the fin tube heat exchanger. By altering the 13X content in the coating solution and coating times, the different coating film thickness was obtained.…”

Parametric Study on the Performance of Amino Silica Hollow Fiber-Based Rapid Temperature Swing Adsorption Cycle for CO2 Capture: A Multiobjective Optimization

“…Ntiamoah et al used a hot CO 2 -rich gas for regeneration in a NaUSY zeolite-packed bed-based TSA process to achieve a specific energy consumption of 3.4 MJ/kg CO 2 , a recovery of 55.5%, and a purity of more than 91%. Esmaeili et al , reduced the regeneration time (heating and cooling steps) by coating an adsorbent on a finned heat exchanger tube. The effect of the adsorbent/exchanger mass ratio on the regeneration time and energy efficiency of CO 2 adsorption and desorption were investigated.…”