| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method and device for recovering methane, capable of recovering methane from a biogas at high recovery rate while suppressing oxygen to or below a prescribed content. <P>SOLUTION: The methane recovering method includes the processes for adsorption removal, reaction removal, trapping and concentration. In the adsorption removal process, siloxane in the biogas is adsorbed by an adsorbent to be removed. In the reaction removal process, hydrogen sulfide in the biogas is reacted with a metal oxide to be removed as a metal sulfide. In the trapping process, oxygen in the biogas is reacted with copper-zinc oxide to be trapped as copper oxide. In the concentration process, carbon dioxide in the biogas is separated by a pressure swing adsorption method and methane is concentrated. Thus, an oxygen content is controlled to a prescribed amount or below, for example to≤10 ppm and thus, methane is recovered from the biogas at high recovery rate. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
