Simulation and analysis of dual-reflux pressure swing adsorption using silica gel for blue coal gas initial separation. (1st January 2021)

• Record Type: Journal Article
• Authors: Guan, Zhongbo; Wang, Yayan; Yu, Xiuxin; Shen, Yuanhui; He, Dongrong; Tang, Zhongli; Li, Wenbin; Zhang, Donghui
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 1(2021)
• Page Start: 683
• Page End: 696
• Publication Date: 2021-01-01
• Subjects: Dual-reflux pressure swing adsorption -- Blue coal gas -- Silica gel -- Operating optimization; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.09.209
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A dual-reflux pressure swing adsorption (DR-PSA) process was proposed and simulated to initially separate the blue coal gas, aiming to capture carbon dioxide (CO2 ) and enrich hydrogen (H2 ), simultaneously. With a feed flow rate of 7.290 slpm, a light product reflux flow rate of 0.505 slpm and the heavy product reflux flow rate of 3.68 slpm, the developed DR-PSA process could capture CO2 up to 64.01% with a recovery of 99.60% and enrich H2 up to 34.66% with a recovery of 97.63% from the blue coal gas (36.2% N2 /28.5% H2 /13.9% CO/12.7% CO2 /8.7% CH4 ). In addition, in order to optimize the process, the effects of various operating parameters on the DR-PSA process performance in terms of product purity and recovery were discussed in detail, including the feed position, the light product reflux ratio and the heavy product reflux ratio. Moreover, the dynamic distribution behaviors of pressure, temperature and gas-solid concentration were presented to explain and evaluate the process separation performance in depth under different operating conditions. Graphical abstract: Image 1 Highlights: The DR-PSA was suggested as a pretreatment unit for blue coal gas. The process produced H2 and CO2 with high recovery, simultaneously. The products were feasible for further H2 purification and CO2 capture.