02556nas a2200289   4500008004100000022001400041245007500055210006900130300001600199490000800215520170000223653002101923653001701944653001701961653001301978653000901991653002002000653002302020653002402043100002602067700002002093700002202113700002102135700002002156700001902176856007102195       2019                        eng d  a1876-610200aMethane hydrate dissociation in the presence of novel benign additives0 aMethane hydrate dissociation in the presence of novel benign add  a5856 - 58650 v1583 a<p>The apparent drawbacks of the classical approaches towards dissociation of natural gas hydrates have resulted in a paradigm shift into the development of new hybrid hydrate dissociation practices combining the various basic hydrate dissociation techniques. Another approach that can be followed to maximize the efficiency of gas production from natural gas hydrate reserves is the identification of benign additives which when used even in sparingly small concentrations may enhance the kinetics of hydrate dissociation. In the present work, a class of such additives, never reported before, have been unveiled and christened as Low Dosage Hydrate Dissociation Promoters (LHDPs). The additives were first short listed from a wide potential pool using a lab scale ( 250 ml) stirred tank reactor setup and then further studied using a bench scale ( 2.35 l) reactor setup where they were injected in the form of a water-additive stream to dissociate hydrates. The dissociation approach followed in the case of the bench scale reactor experiments was a combination of the thermal stimulation and depressurization processes along with the element of injection of additives. For both sets of experiments (lab and bench scale), the newly identified LHDPs were found to enhance the kinetics of methane hydrate dissociation as compared to pure water. It was observed that concentration of additive and its flow rate also affect the kinetics of methane hydrate dissociation. An energy and efficiency analysis for the hydrate dissociation method in the case of bench scale rector revealed that additive presence enhanced the energy ratio and thermal efficiency four fold as compared to pure water.</p>
10aDepressurization10aDissociation10aEnergy Ratio10akinetics10aLHDP10amethane hydrate10aThermal Efficiency10athermal stimulation1 aBhattacharjee, Gaurav1 aBarmecha, Vivek1 aChoudhary, Nilesh1 aPande, Nawal, K.1 aChugh, Parivesh1 aKumar, Rajnish  uhttp://www.sciencedirect.com/science/article/pii/S1876610219305648