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The investigation and introduction results of high-efficiency burning fuel technology with reduced NOx contents
Abdulin M.Z., National Technical University of the Ukraine “Kiev Polytechnical Institute”
Modern burners are required to meet increasingly stringent emission targets. The burner operation bases itself on possible control complex aerodynamic structure of the mixture flow. The aerodynamic structure defines scope of mixture forming and flame stabilization and is organized by either flow twisting or swirlers, or sudden extensions, or obstacles, etc. Investigation carried at NTUU “KPI” and CIAM (Moscow) showed that application of jet-niche cavity as flameholder and single row jet system for mixture forming can significantly improve burner set characteristics. The object of investigation is the air streamlined niche cavity. The flow in the niches was visualized using self-luminous particles. The results of flow nature investigation at various niche scales are given. Furthermore, the mixing layer width does not exceed running flow frontier layer width. The fuel jet mixture forming (natural gas – 98% CH4) in the airflow was investigated by means of methane concentration fields measurement under isothermal conditions. The decade industrial operation of the innovative burners has shown high reliability of ignition and flame stabilization in the wide range of flow speed and fuel flow rate, high quality of the mixture forming that allows to reach optimal values of fuel-air ration and greatest possible combustion completeness. Furthermore, the ordered burner aerodynamic structure excepts burner elements’ overheating and enables work at reduced pressure. So, burning gas technology permits high-efficient low-cost modernization of actual fire-technical objects with conservation of existing infrastructure. Also, innovative technology enables not only gaseous fuel application, but liquid as well and combines perfectly with perspective reducing NOx devices. |