本研究以超重力旋轉床(Rotating Packed Bed, RPB)取代傳統固定填充塔(Packed Bed, PB)，搭配反應速率快且CO2吸收容量大的兩種胺類Piperazine (PZ)及Diethylenetriamine (DETA)捕獲天然氣電廠之煙道氣體中CO2，探究提升吸收劑濃度對於CO2捕獲及吸收劑再生之影響；另亦以Aspen Plus模擬探討相同操作條件下，達到與RPB相同CO2捕獲效率之填充塔體積，以及與RPB相同體積固定填充塔之CO2捕獲效率，以了解RPB取代傳統填充塔之可行性。
PZ/DETA混合配方濃度由2.5 m/2.07 m提升至4 m/8 m，結果顯示Lean Loading為0時PZ/DETA (4 m/6 m)有最佳吸收效果；而Lean Loading約為0.5時最佳吸收配方則是PZ/DETA (4 m/4 m)。此應為配方濃度提升時可增加CO2溶解度及吸收驅動力，然而濃度及Loading值提升時黏度亦提升，導致CO2擴散阻力增加，因此濃度提升之正面效應較無法顯現。
Aspen模擬結果顯示，於相同操作條件下，欲達到相同捕獲效率，填充塔之所需體積較RPB為大，且於高Lean Loading時固定填充塔之所需體積最高可達RPB之4.6倍；而兩種反應器之體積相同時，旋轉床亦有較佳捕獲效率，Lean Loading高時差異可達63%。本研究另探討提升氣體流量對於CO2捕獲量之影響，結果顯示如於CO2捕獲時不限制高捕獲效率，則氣體流量提升於RPB中可大幅提升捕獲量至兩倍以上。而就同體積之RPB與固定填充塔而言，於高氣體流量下操作，隨Lean Loading提升RPB相較於填充塔之捕獲量提升幅度越高，最高可達4.6倍，以上結果皆證明RPB取代固定填充塔可行性相當高。
綜合各吸收劑配方吸收效果與再生能耗比較，PZ/DETA (4 m/4 m)於RPB中再生之能耗較傳統所用之30 wt% MEA低54.8%，搭配其高CO2捕獲效率及容量，實為一具有發展潛力之吸收劑。

Capture of CO2 from natural power plants flue gas by mixed aqueous alkanolamine in a rotating packed bed (RPB) in place of conventional packed bed (PB) absorber was studied. Piperazine (PZ) and Diethylenetriamine (DETA) with fast reaction rate and high CO2 capacity were mixed as CO2 absorbent, and the concentration of alkanolamine was raised in experiments to study the effects of concentration on CO2 capture and absorbent regeneration. In order to figure out the feasibility of RPB in substitution for PB, Aspen Plus simulation of CO2 capture in packed bed using MEA as absorbent was carried out, and the results were compared with RPB experiments results at the same operating conditions.
Concentration of PZ/DETA mixed absorbents was raised from 2.5 m/2.07 m to 4 m/8 m, and the results showed that the absorbent with the best capture efficiency is PZ/DETA (4 m/6 m) when lean loading is 0, whereas when lean loading is about 0.5, the best CO2 capture absorbent is PZ/DETA (4 m/4 m). Although raising the concentration of absorbents may increase CO2 solubility and driving force for CO2 absorption, the viscosity also increases when raising up the concentration and lean loading of absorbents, leading to the increment of CO2 diffusive resistance and the advantages of raising the concentration was overwhelmed.
Results from Aspen Plus simulation showed that at the same operating conditions, PB requires bigger volume than RPB to achieve same capture efficiency, and it’s more significant when lean loading is high, with PB volume reaching 4.6 times of RPB volume. Moreover, capture efficiency is better in RPB than in PB when the two reactors’ volumes are the same. Similarly, the difference of capture efficiency in two reactors is more significant when lean loading is high, reaching 63%.
Effect of increasing gas flow rate on CO2 capture amount was also studied. If there is no limit to CO2 capture efficiency in CO2 absorption process, increasing gas flow rate can make CO2 capture amount upgraded to more than two times. And for RPB and PB with same volume, operating at high gas flow rate, the increased level of CO2 capture amount is more significant along with the increment of lean loading, reaching 4.6 times at most. The results above showed that the feasibility of RPB in place of PB is high.
Comparison of absorption effects and regeneration energy of every absorbent showed that PZ/DETA (4 m/4 m) can be regenerated with 54.8% lower energy than conventional absorbent 30 wt% MEA. With its high CO2 capture efficiency and CO2 capacity, PZ/DETA (4 m/4 m) is an absorbent with potential.

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