Modeling of moving bed CO2 capture process using amine solid adsorbent and its validation using pilot plant test data
Takeshi Okumura, Takahiro Yamaguchi, Shohei Nishibe, Ryohei Numaguchi, Yoshiaki Kawajiri
Abstract
A modeling study is presented for a pilot plant of a moving bed adsorption process for carbon dioxide (CO2) capture using an amine solid sorbent. The pilot plant consists of four towers—adsorption, desorption, and two drying towers. The plant has a capacity of approximately 5 ton-CO2/day, which is the largest scale in the world as a moving bed for CO2 capture using an amine-loaded solid sorbent. Using this plant, 11 operating conditions were implemented and tested. The isotherm in the model were established from lab-scale measurements. For the 11 conditions, the model successfully captured the influences of operating conditions, such as the circulation flow rate of solid sorbent, amount of solid sorbent, temperature and humidity of the feed gas, and amount of steam introduced in the desorption step. Furthermore, the temperature of the solid sorbent and composition of the outlet gases was found to be in agreement with the model.