李春晓等-上海理工大学-Promoting methane storage in clathrate hydrates with the natural tobacco

Session 5 - Oral 1

Promoting methane storage in clathrate hydrates with the natural tobacco

Chunxiao Lia,b, Liang Yanga,b,*, Huihui Hua,b, Dongbo Zhoua,b

a School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

b Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, China

ABSTRACT：The rapid formation rate and high storage capacity of clathrate hydrates are crucial for natural gas storage and transportation. In this study, a series of wet tobacco samples prepared by soaking different masses of tobacco shred/granules in water were used to store methane in the hydrate. Gas consumption experiments were conducted in an unstirred reactor to investigate the hydrate formation kinetics in the tobacco/water mixtures and their filtrates at 274.15 K and 8.0 MPa. The results demonstrated that the tobacco solutions with surfactivity played a promoting role in the hydrate formation. The wet loose biomass materials provided abundant nucleation sites for gas to solid hydrates. Compared to pure water, the tobacco–water mixtures significantly shorten the induction time of nucleation and accelerate hydrate growth. The amount of methane stored in tobacco granule systems ranged from 112.3 to 160.3 cm3·cm-3, and the storage rates reached 2.06–5.58 cm3·cm-3·min-1. The wet tobacco shreds exhibited higher gas uptakes (132.6–171.6 cm3·cm-3) than the tobacco granule systems and tobacco shreds filtrates at the same liquid–solid ratio. The use of green wet tobacco samples to enhance of hydration should be helpful for the extension of hydrate-based technology.

Keywords: methane hydrate, formation, kinetics, promotion, natural tobacco, surfactivity