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Zhang Q.,Heilongjiang University | Zhang Q.,CAS Qingdao Institute of Oceanology | Zhang Q.,State Key Laboratory of Basic Research of Hydrocarbon Gas Transportation Pipeline Safety | Wu Q.,Heilongjiang University | And 9 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2015

High-pressure experimental apparatus of mine gas hydration was used to carry out the nucleation kinetics experiments of mine gas hydrate in different concentrations of sodium chloride (NaCl) and sodium dodecyl sulfate (SDS) composite systems and studied the induction time of multi-component mine gas hydrate formation in NaCl-SDS complex solutions, and also the nucleation and kinetics mechanism was preliminarily discussed. The results show that the induction time of multi-component mine gas hydrate formation is shortened with the increase of C3H8 concentration, and adding sodium chloride (NaCl) can promote mine gas hydrate nucleation process. The induction time of mine gas hydrate decreases with the increase of NaCl concentration in the range of 0.5%-3.5%. The maximum reduced induction time of three multi-components mine gas hydrates are 22 min, 43 min, and 53 min respectively in NaCl-SDS complex system compared with those in SDS system. It is found that CH4 and C3H8 in multi-component mine gas can nucleate collaboratively according to the mechanism analysis of Sloan nucleation and cluster, which simplifies its nucleation process comparing with the single-component. NaCl can promote the precursor formation of mine gas hydrate, enhance the strength of hydrogen bonds between water molecules, strengthen SDS solubilization and shorten the induction period of mine gas hydrate formation. © 2015, China Coal Society. All right reserved. Source

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