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AssigneeL'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorsFrank Rheker, Dirk Hölscher, Robert Klein
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The present invention relates to a process and apparatus for improving the combustion of a secondary fuel supplied in a first stream in a rotary kiln, wherein the rotary kiln has a burner assembly comprising a main burner and a plurality of feed channels for various media, of which one is designed for the supply of a secondary fuel, in particular in the form of particles or shreds in a stream of compressed air. According to the invention, a tubular oxygen lance for an oxygen-rich gas, in particular, technical grade gaseous oxygen, or an oxygen-rich liquid, in particular, technical grade liquid oxygen, with an angled nozzle at its end, is arranged in or on a feed channel of the burner assembly, whereby the oxygen lance is brought into such a position that the oxygen emerging from a nozzle forms a second stream that strikes a first stream of secondary fuel. The present invention may be considered for new constructions of burner assemblies for rotary kilns, but mainly serves for retrofitting existing burner assemblies in which mostly feed channels are available as required for inserting an oxygen lance in the present invention. Targeted delivery of gaseous or liquid oxygen, or oxygen-enriched gas or liquefied gas to a secondary fuel can significantly improve the combustion process and consequently significantly reduce exhaust emissions, in particular, the emission of carbon monoxide.
A process for improved combustion of a secondary fuel supplied to a rotary kiln in a first stream, whereby the rotary kiln has a burner assembly including a main burner for primary fuel and a plurality of feed channels extending parallel to a main axis of the burner assembly for various media, one of said feed channels, called secondary fuel channel, being provided for supplying the first stream of the secondary fuel, characterized in that:
An apparatus comprising a rotary kiln and intended for improved combustion of a secondary fuel supplied in a first stream to the rotary kiln, whereby the rotary kiln has burner assembly with a main burner for supplying primary fuel and a plurality of feed channels for various media extending parallel to a main axis of the burner assembly, one of said feed channels being a secondary fuel channel for supplying the first stream of secondary fuel, characterised in that a tubular oxygen lance for supplying an oxygen-rich gas, or an oxygen-rich liquid, is positioned in or on another one of said feed channels, called oxygen channel, said lance having an angled nozzle at its feed end such that when, in operation, oxygen-rich gas or oxygen-rich liquid emerges from the angled nozzle and a second stream is formed of oxygen-rich gas or oxygen-rich liquid which impacts the first stream of secondary fuel at an angle thereto.
A process for retrofitting a rotary kiln having a burner assembly with a main burner for supplying primary fuel and a plurality of feed channels for various media extending parallel to a main axis of the burner assembly, one of said feed channels being a secondary fuel channel for supplying a first stream of secondary fuel, the process comprising:
Dependencies are inferred from the claim text.