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OS3A-6:ENHANCING CO2 HYDRATE FORMATION BY LOW DOSAGE PROMOTER
发布时间:2014-07-28
B. EGENOLF-JONKMANNS, S. BRUZZANO, G. DEERBERG, G. JANICKI
Fraunhofer Institute for Environmental, Safety, and Energy Technology UMSICHT, GERMANY
Recent research work regarding the promoting effect of cross-linked polyacrylate particles onto CO2 hydrate formation using high-pressure DSC and a glass pressure reactor system will be presented. CO2 hydrate formation and growth are studied while using hydrogel additives of different morphological structure.
A first series of reactor experiments using hydrogel samples with variable particle diameter [1] was carried out. It was found out that there is an influence on the induction time which represents an essential key parameter of the hydrate formation. Another aspect of the investigations is the gas consumption which corresponds to the incorporation of CO2 into the hydrate cage. DSC-measurements show, that solutions with hydrogel sample with low portion of cross linker leads to thermodynamically higher amounts of CO2 hydrates than the application of ultrapure water. This phenomenon is consistent with the observed higher gas consumption and incorporation of CO2 into the hydrate structure respectively.
CO2 hydrate slurries offer significantly higher energy storage densities (500 kJ kg-1) than ice
slurries (334 kJ kg-1) for coolant purposes [2]. Nevertheless their practical utilization is hampered due to the slow and unpredictable kinetics of hydrate formation. Therefore addition of cross-linked polyacrylate hydrogels is tested. The main idea is to influence the kinetics and thermodynamics of hydrate formation in such a way, that CO2 hydrate slurries become applicable in practice.
Acknowledgements：We thank the German Federal Ministry for Economics and Technology for funding this research work and Prof. Didier Dalmazzone (ENSTA ParisTech), and Prof. André Laschewsky (University of Potsdam) for scientific support and discussion.
Reference
[1] Egenolf-Jonkmanns et al.: Low temperature chemical reactions systems for thermal storage, Energy Procedia 30 (2012), 235-43.
[2] Gang Li et al.: Review of cold storage materials for air conditioning application, International Journal of Refrigeration 35 (2012), 2053-77
Fraunhofer Institute for Environmental, Safety, and Energy Technology UMSICHT, GERMANY
Recent research work regarding the promoting effect of cross-linked polyacrylate particles onto CO2 hydrate formation using high-pressure DSC and a glass pressure reactor system will be presented. CO2 hydrate formation and growth are studied while using hydrogel additives of different morphological structure.
A first series of reactor experiments using hydrogel samples with variable particle diameter [1] was carried out. It was found out that there is an influence on the induction time which represents an essential key parameter of the hydrate formation. Another aspect of the investigations is the gas consumption which corresponds to the incorporation of CO2 into the hydrate cage. DSC-measurements show, that solutions with hydrogel sample with low portion of cross linker leads to thermodynamically higher amounts of CO2 hydrates than the application of ultrapure water. This phenomenon is consistent with the observed higher gas consumption and incorporation of CO2 into the hydrate structure respectively.
CO2 hydrate slurries offer significantly higher energy storage densities (500 kJ kg-1) than ice
slurries (334 kJ kg-1) for coolant purposes [2]. Nevertheless their practical utilization is hampered due to the slow and unpredictable kinetics of hydrate formation. Therefore addition of cross-linked polyacrylate hydrogels is tested. The main idea is to influence the kinetics and thermodynamics of hydrate formation in such a way, that CO2 hydrate slurries become applicable in practice.
Acknowledgements：We thank the German Federal Ministry for Economics and Technology for funding this research work and Prof. Didier Dalmazzone (ENSTA ParisTech), and Prof. André Laschewsky (University of Potsdam) for scientific support and discussion.
Reference
[1] Egenolf-Jonkmanns et al.: Low temperature chemical reactions systems for thermal storage, Energy Procedia 30 (2012), 235-43.
[2] Gang Li et al.: Review of cold storage materials for air conditioning application, International Journal of Refrigeration 35 (2012), 2053-77
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