Abstract: The formation of nitrogen oxides during the operation of burners for solid, liquid, and gaseous fuels is reduced by means of an exhaust gas feed-back system. The exhaust gases are injected into a combustion chamber through openings provided in the region of stabilizer via a flame pipe and, by choice, also around the flame pipe. Preferably, the combustion air as well as the exhaust gases are activated by an active aerosol. The exhaust gas feed-back is effected by means of a longitudinally slidable adaptor pipe and an adaptor pipe shoulder enclosing the flame pipe at least partly. The regulation of the exhaust gas streams is achieved by displacing the adaptor pipe and the adaptor pipe shoulder.

Abstract: A device is disclosed which is especially adapted for use in activating the combustion process in combustion systems equipped with a combustion chamber supplied with solid, liquid or gaseous fuel. The device employs a container which is partially filled with water and which is supplied with compressed air such that the compressed air flows through the water before being delivered to the combustion chamber, whereby the air is made moist. On its way to the combustion chamber, the moist air flows through a chamber containing a buffer liquid. A conduit extends between the chamber containing the buffer liquid and another chamber, the conduit having a transmission cross section selected such that a shock-absorbing function is performed.