Method for increasing reaction temperature of CH4 and CO2 replacement reaction

摘要

The present invention relates to a method for recovering methane gas from a natural gas hydrate. The method includes the steps of: applying a mixed gas including nitrogen, carbon dioxide, and specific additive gas to the natural gas hydrate discovered in the deep sea; and replacing the mixed gas with the methane gas. The present invention can implement a methane gas replacement process at a temperature higher than in other cases employing conventional method and recover the methane gas without the collapse of the natural gas hydrate layers. Exhaust gas can be used as the mixed gas, thereby enabling the waste resources and increasing the economical efficiency thereof. The present invention can prevent the carbon dioxide and the little additive gas in the exhaust gas from being released to the atmosphere to additionally prevent the global warming while producing natural gas more effectively.