Method for purifying a raw gas stream and purification device

A method for purification of a raw gas stream via a purification device, the purification device including (i) a plurality of flow chambers having heat storage material and (ii) an open-loop control device, the raw gas stream containing water vapour and having organic contaminants, the method comprising:

• feeding the raw gas stream to a reforming region in which contaminants in the raw gas stream react chemically with the water vapour in the raw gas stream, as a result of which a reformed raw gas stream is obtained;
• feeding the reformed raw gas stream and an oxidising agent stream to an oxidation region in which constituent parts of the reformed raw gas stream react chemically with oxidising agent of the oxidising agent stream, as a result of which a clean gas stream is obtained;
• and
• switching, via the open-loop control device, the purification device between first and second purification modes,
• wherein, in the first purification mode, the raw gas stream is to be fed at least to a first of the flow chambers, and the clean gas stream is to be discharged, by a clean gas discharge line, from at least a second of the flow chambers;
• and
• wherein, in the second purification mode, the raw gas stream is to be fed to the at least one second flow chamber, and the clean gas stream is to be discharged, by the clean gas discharge line, from the at least one first flow chamber.