Patent ID: 8075303
Filing Date: 2011-12-13
Classification: F23C,F23L,Y02E

Abstract:
1. Method for homogenizing the heat distribution as well as decreasing the amount of NO x in the combustion products when operating an industrial furnace ( 1 ) with at least one conventional burner ( 2 a , 2 b , 2 c , 2 d ) using air as oxidant, where a lance ( 3 a , 3 b , 3 c , 3 d ) is introduced into the furnace ( 1 ), the method comprising streaming an additional oxidant comprising at least 50% oxygen gas into the furnace ( 1 ) through the lance ( 3 a , 3 b , 3 c , 3 d ), and the total amount of oxygen supplied, partly through the air, partly through the additional oxidant, is supplied in a predetermined ratio in relation to the amount of fuel being supplied through the air burner ( 2 a , 2 b , 2 c , 2 d ), wherein at least 40% of the supplied oxygen is supplied through the additional oxidant, the lance ( the additional oxidant is caused to stream into the furnace ( the additional oxidant is supplied only when the air burner (