State Key Laboratory of Basic Research of Hydrocarbon Gas Transportation Pipeline Safety

Harbin, China

State Key Laboratory of Basic Research of Hydrocarbon Gas Transportation Pipeline Safety

Harbin, China
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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 8 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2016

Impedance method can be used to monitor the changes of the binding and movement of various solid,liquid inner and interface charges.The impedance characteristic monitoring experiment devices of mine gas hydrate curing process of outburst coal are used to estimate the impedance changes during the process of mine gas hydrate curing with the same porosity in coal under the condition of different mass fractions of NaCl solution which is used as the coal pore liquid.The experimental results show that the impedance variation in the experimental reactor is divided into three layers and the curve of impedance variation of mine gas hydrate curing process is analyzed that the amount of mine gas hydrate formation is larger in the upper layer and the impedance reduces gradually in the lower layer without mine gas hydrate formation.The water conversation of hydration is obtained by using the calibration of NaCl mass fraction curve; the mine gas hydrate growth model is established based on the PR state equation and the changes of mine gas,and the gas content of mine gas hydrate is calculated according to the results of chromatography analysis. © 2016, Editorial Office of Journal of China Coal Society. All right reserved.


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.

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