| 摘要 |
In a firing plant which is operated with fossil fuels, the exhaust gases (A) from the combustion space (22) are cooled in a heat exchanger (X). A part of these cooled exhaust gases (A') are mixed with fresh air (L) and are conducted by means of a fan (D) in the direction of the burner (Z). This exhaust gas/fresh air mixture forms the combustion air (15) for the burner (Z). Before the introduction of this combustion air (15) into the burner (Z), it is again heated in the heat exchanger (X'). The combustion air (15) preheated in this way ensures complete evaporation of a liquid fuel (12) and acts against the high flame temperature peaks in the combustion space (22) immediately after the burner (Z), which are responsible for the formation of NOx. The burner (Z) can be operated with liquid and/or gaseous fuel.
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