Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
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Hydrate Formation and Methane Mass Transfer Characteristics in Static Systems of Pure Water and Saline Water with Varied Initial Dissolved Methane Concentrations
No full textMethane seepage from deep-sea seabeds is an important carbon and energy source in the ocean, exerting significant impacts on marine and global environments and ecosystems. The conversion characteristics of dissolved methane to solid hydrates not only influence the variation pathways of seeping methane but also play a crucial role in methane's biological and chemical transformation processes. The dissolved methane concentration around seafloor methane seepage vents varies with distance, yet the hydrate transformation characteristics with different concentrations of dissolved methane remain unclear. In this study, the hydrate formation and methane mass transfer characteristics in static systems of pure water and saline water with different initial dissolved methane concentrations were investigated. The experimental results indicated that the slow mass transfer process of methane molecules in the water phase was a key limiting factor for the conversion of dissolved methane into hydrates. Compared to pure water, the lower mass transfer coefficient of methane in saline water further restricted the hydrate formation and also slowed the process of methane gas dissolution. Although differences were observed in the growth status of interfacial hydrates for different experiments, resulting in smooth or needle-like hydrate membranes, this did not significantly affect the conversion of gaseous methane to hydrates. The findings of this study provide foundational data and theoretical support for understanding the fate of methane in systems with varying initial dissolved methane concentrations
Young Talent Support Project of Guangzhou Association for Science and Technology[2023CY-1-03]
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A non-linear convex model based energy management strategy for dual-storage offshore wind system
No full text-Using hydrogen production as energy storage can realize large-scale storage and transportation of energy, which is conducive to flexible scheduling of offshore wind power resources. However, compared with the battery energy storage system, the energy management strategy (EMS) of the dual-storage offshore wind power system with hydrogen production is more complex and nonlinear due to the large number of state variables and control variables. In order to realize the EMS of the system to maximize the benefits and minimize the aging cost, a nonlinear convex model is first established, and then an iterative solution method combining convex programming (CP) and dynamic programming (DP) is proposed. Among them, CP solves the global optimization problem of power distribution, and DP determines the start and stop of the electrolyzer. Finally, the feasibility of the proposed method is verified by simulation analysis
Unveiling the role of lignin feature on bio-ethanol and xylose derived from poplar during combined alkali/ethanol synergistic pretreatment
No full textThis study adopted a mixed experimental research design to investigate the effects of alkali and alkali-catalyzed ethanol pretreatment of poplar wood under different NaOH loadings on the pretreatment liquid, pretreatment solids, and polysaccharide conversion, with a particular emphasis on the utility of the lignin for subsequent conversion. Specifically, NaOH catalyzed ethanol pretreatment at 10% NaOH loading resulted in the removal of more than 80% lignin with >80% carbohydrates remaining in the residual solids. Simultaneous saccharification fermentation of this pretreated residue resulted in 29.09 g/L (72.84%) and 14.86 g/L (69.26%) of ethanol and xylose, respectively, following a fermentation period of 72 h. Then, an integrated evaluation of the lignin characterization in raw and pretreated residues was carried out to emphasize their influence on ethanol and xylose yield by two-dimensional heteronuclear single quantum coherence (2D-HSQC) NMR and gel permeation chromatography (GPC) analysis. The results showed that most of the side-chain structures were oxidized and the aryl-ether bond was dissociated with the synergistic influence of NaOH and ethanol treatment, accompanied by low molecular weight lignin obtained in the solid fraction. Overall, NaOH catalyzed ethanol pretreatment offered a strategy for selective biomass fractionation into carbohydrates conversion and lignin valorization with a high yield
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