| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for removing low concentration methane that secure a sufficient methane removing performance even if a sulfur compound is coexistent and never deteriorate the performance even if the methane concentration is largely fluctuates, and to obtain a stable removing performance for a long time when removing methane from a gas containing low concentration methane that is not within a flammable scope even if the air and the gas are mixed in any ratio. <P>SOLUTION: After a gas G to be treated is preheated through the low temperature channel 3a of a heat exchanger 3, the gas G to be treated is allowed to go through an oxidation catalyst 2, and after it is also allowed to go through a high temperature channel 3b, thereby performing heat recovery by heat exchanging with the gas G to be treated before a reaction, the gas to be treated is supplied to a channel where the supplied gas is discharged, a part of the treated gas G supplied to the low temperature channel 3a is communicated with a short-path flow channel 7 provided by short-passing the upstream side and downstream side of the heat exchanger 3 in the flow passage. The content of the treated gas that goes through the short-path flow channel 7 is changed to set low as the methane concentration in the gas to be treated is low, and set high as the methane concentration in the gas to be treated is high. <P>COPYRIGHT: (C)2011,JPO&INPIT |
