Oxygen enrichment of cement kiln system combustion
AssigneeCemex, Inc.
InventorsHerman H. Tseng, Philip A. Alsop
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Abstract
The invention in its various embodiments includes an apparatus and a method for improving combustion in a cement kiln system. The apparatus in one embodiment includes a precalciner and an oxygen source coupled to the precalciner. The method in one embodiment includes introducing oxygen into the precalciner of a cement kiln system.
Claims23
A method for producing cement clinker in a rotary cement kiln system having a precalciner comprising a fueled burner and receiving a tertiary air stream, wherein the improvement comprises enriching the tertiary air stream with oxygen.
A method for manufacturing cement clinker in a rotary kiln, comprising the steps of:
- preheating a feed material;
- precalcining the preheated feed material in a precalciner having a fueled burner;
- supplying tertiary air to the precalciner;
- enriching the tertiary air with oxygen;
- and
- converting the precalcined feed material into clinker in the kiln.
A method for producing cement clinker in a cement kiln system including a rotary kiln and a precalciner having a fueled burner, comprising the steps of:
- preheating a feed material;
- precalcining the preheated feed material with oxygen enriched tertiary air in a precalciner having a fueled burner, including:
- drawing tertiary air from an air source including a clinker cooler;
- receiving oxygen from an oxygen source including at least one of a source of cryogenic oxygen and a vacuum swing adsorption installation;
- mixing the oxygen with the tertiary air such that the oxygen will comprise up to about 25% of the stoichiometric requirement to combust the precalciner fuel;
- and
- introducing the oxygen enriched tertiary air into the precalciner;
- and
- converting the precalcined feed material into clinker in the kiln.
Dependencies are inferred from the claim text.