TAILIEUCHUNG - Hydrodynamics Optimizing Methods and Tools Part 13

Tham khảo tài liệu 'hydrodynamics optimizing methods and tools part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 348 Hydrodynamics - Optimizing Methods and Tools a Slurry formation Higher rd and rs large apparent interface area b Intermediate decreasing apparent interface area c Shell formation Lower rd and rs small apparent interface area Fig. 9. Speculated mechanisms of hydrate formation in static-mixing type flow reactor Tajima et al. 2011b Case C is for strong hydrate shell formation. In this case the target gas bubbles are rapidly covered with strong hydrate shell because the hydrate formation rate rf is relatively higher Gas Hydrate Formation Kinetics in Semi-Batch Flow Reactor Equipped with Static Mixer 349 than shedding rate rs. The apparent interfacial area between gas and water a is considerably restricted and also the dissociation rate rd is considerably decreased for example a similar situation have been observed in the case of CO2 hydrate formation Ogasawara et al. 2001 . As a result there is little the further hydrate formation and thus the overall hydrate formation rate constant aK is low depending on rd and rs. This hydrate formation occurs under hard thermodynamic conditions higher pressure and lower temperature and lower mechanical mixing conditions. Although the additive addition can prevent the strong hydrate shell sufficient mechanical condition is necessary to form further hydrate with accelerating the hydrate shedding process. Case B is for porous and rough hydrate particle film formation and the intermediate case between Cases A and C. Hydrate particles and partial hydrate film are formed on bubble surface. The film pore and void channels allow target gas to diffuse into water phase Sloan Koh 2008 and partial hydrate shedding is occurred on bubble surface. The apparent interfacial area between target gas and water however is decreased and the dissociation of target gas into water is limited by rough hydrate film formation. As a result the aK value not only a but also K values is lower than that for Case A. In another case higher concentration of .

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