Method for heating a blast furnace stove
AssigneeLinde Aktiengesellschaft
InventorsAndrew Cameron, Tomas Ekman, Mats Gartz
Life of this patent
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Abstract
A method for heating a blast furnace stove includes combusting a fuel with a lower heating value (LHV) of 9 MJ/Nm3 or less in a combustion zone which is arranged in a combustion chamber in the stove, and causing the combustion gases to flow through and thereby heat refractory material in the stove. The fuel is combusted with an oxidant including at least 85% oxygen, and combustion gases are recirculated into the combustion zone for diluting the mixture of fuel and oxidant therein sufficiently for the combustion to be flameless.
Claims14
A method for heating a blast furnace stove including a combustion chamber having a combustion zone therein, comprising:
- combusting a fuel with a lower heating value (LHV) of not more than 9 MJ/Nm3 in the combustion zone of the blast furnace stove,
- causing combustion gases to flow through and be exhausted from refractory material in the stove for heating said refractory material,
- supplying and adding an oxidant comprising an oxygen content of at least 85% into the combustion chamber for recirculating the combustion gases including said oxidant into the combustion zone, wherein the recirculating the combustion gases is from a location inside the combustion chamber, but outside an area of the combustion chamber occupied by the combustion zone,
- further supplying the oxidant to the combustion zone at high velocity through at least one lance, thereby entraining the combustion gases into the combustion zone for diluting of the mixture,
- diluting a mixture of the fuel and the oxidant with the recirculated combustion gases, and
- flamelessly combusting said mixture in the combustion zone.
Dependencies are inferred from the claim text.