METHOD AND APPARATUS FOR OPERATING A FURNACE

摘要

The present invention relates to a method for operating combustion process in a furnace (1) whereby a primary fuel and a secondary fuel are burnt, to an apparatus for injecting liquid oxygen into the furnace and also to the corresponding furnace. The method comprises at least the following steps: - the primary fuel and a primary oxidizer are injected into the furnace (1) to create a primary combustion zone (2), - liquid oxygen (LOX) is injected in as secondary oxidizer such that the secondary fuel combusts with the secondary oxidizer thereby creating a distinct secondary combustion zone (3). The invention makes it possible for a secondary fuel having a significantly lower calorific value than the primary fuel to be burnt completely in the furnace, such that a product to be produced in the furnace has an improved quality.