疏水陶瓷中空纖維薄膜於混合氣體中二氧化碳捕捉之模擬與實驗研究

Abstract

本研究利用二維質量傳遞模型來模擬中空纖維膜接觸器內二氧化碳之輸送行為,其中混合 PZ 與 AMP 作為化學吸收劑使用,模型適用於非潤濕條件,且考慮到徑向和軸向擴散,對流,化學反應。實驗結果中 AMP 與 PZ 混合溶液的二氧化碳化學吸收通量去與模擬結果做擬合驗證,接著改變其他參數進行模擬預測,其模擬結果總結如下。 與二氧化碳吸收通量的實驗結果相比,物理模型的驗證是有良好的一致性。沿著無因次化的中空纖維薄膜膜組件長度來看,氣體流速、液體流速、化學吸收劑濃度和管長的不同,將使得二氧化碳移除率也有所改變,液體流速、化學吸收劑濃度和管長的增加,會使得二氧化碳吸收增加,另外一方面,氣體流速增加則會降低二氧化碳吸收。 所提出的數學模型可以從中空纖維薄膜接觸器混合氣體內預測二氧化碳捕捉之結果,且透過模擬的方式,從而減少實驗的成本。

In this study, a two-dimensional mass transfer model is developed to simulate the carbon dioxide transport for the hollow fiber membrane contactor in which mixed piperazine (PZ) and 2-amino-2-methyl-1-propanol (AMP) as the chemical absorbent is used. The model is developed for non-wetted conditions, taking into account radial and axial diffusion, convection, and chemical reaction in the membrane contactor. The simulation results for chemical absorption of carbon dioxide in AMP/PZ blended solution are summarized as below. The validation of the physical model compared with the experimental result of carbon dioxide absorption flux is good agreement. The carbon dioxide concentration along the length of the module with respect to different values of gas flow rates, liquid flow rates, chemical absorbent concentration, and module length can be taken into account. Carbon dioxide absorption from the gas mixture increases while the liquid flow rates, chemical absorbent concentration, and module length going up. On the other hand, increase of gas flow rates reduces removal of carbon dioxide. The proposed mathematical model can predict carbon dioxide capture from gas mixtures in HFMCs. Through computer simulation, thereby reducing the cost of experiments.