Experimental Investigation of Precombustion CO2 Capture Using a Fixed Bed of Coal Particles in the Presence of Tetrahydrofuran

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• 作者：Jin Yan ; Yi-Yu Lu ; Jia-Le Wang ; Sheng-Lan Qing ; Yu-Rui Wang
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：August 18, 2016
• 年：2016
• 卷：30
• 期：8
• 页码：6570-6577
• 全文大小：404K
• 年卷期：0
• ISSN：1520-5029

文摘

This work presents a hybrid gas adsorption and hydrate formation process for CO₂ capture from fuel gas (40 mol % CO₂/H₂) using a fixed bed reactor (FBR) of coal particles. To better understand the CO₂ capture performance of this hybrid process, the effects of particle size and tetrahydrofuran (THF) concentration on gas consumption and CO₂ selectivity were experimentally investigated at 100% liquid saturation of the fixed bed. The experiments were conducted at 274.2 K with the initial pressure fixed at 3.0 MPa. The results indicated that medium-sized coal particles (0.5–1.0 mm) are more favorable than small (0.1–0.5 mm) and large (1.0–3.0 mm) coal particles as higher gas uptake, CO₂ recovery, and separation factor were obtained in the FBR filled with medium-sized coal particles. Gas uptake was observed to increase while increasing THF concentration from 1.0 to 5.6 mol %, but the optimum CO₂ selectivity was obtained at 1.0 mol % THF. The gas uptake obtained at 1.0 mol % THF in the FBR of coal particles was comparable with that obtained at 5.53 mol % THF in the FBR of silica sand at the same temperature and pressure conditions. Therefore, the FBR of coal particles saturated by 1.0 mol % THF solution can be used as a viable format for CO₂ capture from fuel gas when considering gas uptake and CO₂ selectivity at the same time.