A reformer, particularly an autothermic secondaryreformer, is equipped with a central gas feed pipe penetratingthe catalyst bed from the lower side and connected to a mixingand reaction chamber. A feeding device for the oxidizing agentis arranged at least at one level above the catalyst bed andpenetrates reaction chamber wall from the external side, thedevice consisting of at least two inlet nozzles. The outletend of centre feed pipe is located near the level of the feedingdevice for the oxidizing agent or above said level.
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