Patent ID: 9067175
Filing Date: 2015-06-30
Classification: B01D,B01J,F23G,Y02C

Abstract:
1. A method of removing low concentration methane from a treatment-object gas which contains the methane at such a low concentration as not to be rendered into a combustible range with whatever ratio of air mixed therewith, the method comprising the steps of: feeding the treatment-object gas through a heat exchanger for preheating the treatment-object gas; feeding the resultant gas to an oxidization catalyst contact-oxidizing methane for a catalytic oxidization reaction; and feeding the resultant reacted gas again through said heat exchanger together with an amount of un-reacted gas for recovery of heat from the reacted gas through heat exchange with the un-reacted gas; wherein the method further comprises the step of varying the amount of gas to be fed to the oxidization catalyst in accordance with the concentration of the methane contained in the treatment-object gas in such a manner that the gas rate is increased when the methane concentration is high whereas the gas rate is decreased when the methane concentration is low.