The Effect of CO 2 Partial Pressure on CH 4 Recovery in CH 4 -CO 2 Swap with Simulated IGCC Syngas

Ya-Long Ding, Hua-Qin Wang, Chun-Gang Xu and Xiao-Sen Li
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Ya-Long Ding: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510641, China; Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510641, China
Hua-Qin Wang: College of Chemistry and Pharmaceutical Engineering, Huanghuai University, Zhumadian 463000, China
Chun-Gang Xu: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510641, China; Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510641, China
Xiao-Sen Li: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510641, China; Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510641, China

Energies, 2020, vol. 13, issue 5, 1-11

Abstract: To investigate the influence of CO 2 partial pressure on efficiency of CH 4 -CO 2 swap from natural gas hydrates (NGHs), the replacement of CH 4 from natural gas hydrate (NGH) is carried out with simulated Integrated Gasification Combined Cycle (IGCC) syngas under different pressures, and the gas chromatography (GC), in-situ Raman, and powder X-ray diffraction (PXRD) are employed to analyze the hydrate compositions and hydrate structures. The results show that with the P-T (pressure and temperature) condition shifting from that above the hydrate equilibrium curve of IGCC syngas to that below the hydrate equilibrium curve of IGCC syngas, the rate of CH 4 recovery drastically rises from 32% to 71%. The presence of water can be clearly observed when P-T condition is above the hydrate equilibrium curve of IGCC syngas; however the presence of water only occurs at the interface between gas phase and hydrate phase. No H 2 is found to present in the final hydrate phase at the end of process of CH 4 -CO 2 swap with IGCC syngas.

Keywords: CH 4 hydrate; replacement; IGCC syngas; in-situ Raman (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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