METHOD AND COKE OVEN FOR REDUCING NOX CONTENT IN FLUE GAS INHEATING COKE OVEN

摘要

In regenerative coking ovens having vertical heating flues cooperating in pairs, high level and low level combustion stages and means arranged at the bottoms of respective heating flues to recirculate the flue gas, the following measures insure a substantially reduced generation of NOx contents in the flue gas: the recirculation current rate is between 20% and 50%, the combustion stage ratio is between 40% and 70% and the second combustion stage is arranged between 35% and 55% of the height of the heating flue.