| 摘要 |
<p>Improvements in a fuel burner for a boiler comprising a first assembly (S1) for delivering into the boiler (3) a fuel stream , a second assembly (S2) for delivering into the boiler a stream of secondary air, a precombustion chamber (6) extended with a certain length (L2) into the combustion chamber (2) in the boiler (3) and a nozzle flameholder (14), opposite the outlet of the fuel stream, which flameholder supplies fluid jets (F) directed against said fluid stream in order to provide a recyrcle zone in said precombustion chamber (6); a third assembly (S3) is provided for delivering into the boiler a tertiary air stream which laps the inner walls of the precombustion chamber (6) and optionally there is provided a fourth assembly (S4) for delivering a quaternary air stream from outlets (23) of the precombustion chamber (6).</p> |
