Innovative CO2 Capture TSA with Direct Thermal Conduction Heating Adsorber

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H03631
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 64020:Environmental load reduction and remediation-related
• Research Institution: Kanazawa University
• Principal Investigator: Kodama Akio 金沢大学, 新学術創成研究機構, 教授 (30274690)
• Co-Investigator(Kenkyū-buntansha): 汲田 幹夫 金沢大学, フロンティア工学系, 教授 (60262557) ; 大坂 侑吾 金沢大学, 機械工学系, 准教授 (70586297)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 吸着 / 二酸化炭素 / 廃熱利用

Outline of Final Research Achievements

An internally heated and cooled temperature swing adsorption process that can be driven by low-temperature waste heat below 100°C has been developed to contribute to CO2 emissions reduction. To improve the thermal response of the adsorbent bed, the adsorbent was applied directly to the heat exchanger, and better CO2 concentration and capture performance than the adsorbent-filled type was obtained.
A two-stage adsorption process using an adsorbent-filled adsorption column was tested, and the concentration of CO2 recovered reached 95%.
Molecular sieve carbon CMS, a hydrophobic adsorbent, is less effective than zeolite in CO2 selectivity and adsorption capacity, but its separation and concentration performance is almost equal in wet gas at 70% relative humidity.

Free Research Field

プロセス工学

Academic Significance and Societal Importance of the Research Achievements

本研究は，内部熱交換型吸着塔の高度化によって，排出二酸化炭素の効率的な濃縮回収技術を提供するものであり，カーボンニュートラルへの実現ひいては地球温暖化の抑制への貢献を第一義とする。研究成果は温度スイング吸着TSAの吸着速度差分離型への展開も後押しする。これによりTSAが適用できる分離対象が拡大し，低温廃熱利用もさらに促進される。さらに，内部熱交換型吸着塔では吸着材の温度制御が可能であり，温度によって吸着材特性が大きく変わる新規吸着材活用の学術的基盤の創造にもつながる。