Multistage separation center backflow axial cyclone burner

Abstract

The invention discloses a multistage separation center backflow axial cyclone burner. A traditional cyclone burner technology needs to further reduce NOx emission. A primary wind pipe elbow (1) is connected with a primary wind pipe horizontal section (2); a center wind pipe module (5) and a connected combustion stabilizing ring (7) are arranged in the center of the primary wind pipe horizontal section; a pulverized coal uniform distributor (3) is arranged in an inlet; a venturi pulverized coal concentrator (4) is arranged near an outlet; a secondary wind pipe (10), a secondary wind gate (13) and a secondary wind pipe expanding port (17) are arranged at the external of the primary wind pipe horizontal section; a ternary wind pipe (11), a ternary wind gate (14) and a ternary wind pipe expanding port (18) are arranged at the external of the secondary wind pipe; the ternary wind pipe is provided with a ternary wind cyclone adjusting mechanism (15); a quartic wind pipe (12) is arranged at the external of a ternary wind pipe; the quartic wind pipe is provided with a quartic wind cyclone adjusting mechanism (16); and an outlet of a quartic wind pipe is connected with a water cooling wall pipe screen (19). The invention is applied to the multistage separation center backflow axial cyclone burner.

Description

Technical field: [0001] The invention relates to the technical field of high-efficiency and clean combustion of coal, and in particular provides a multi-stage separation center return type axial swirl burner. Background technique: [0002] The existing swirl burner technology for wall-type opposed combustion boilers has different NOx emissions depending on the coal quality. For dry ash-free bituminous coal with a volatile fraction of 36-38%, the NOx emissions that can be achieved with the existing technology are roughly 240-38%. 280mg / Nm3 (6% O2, dry flue gas), for lean coal with a volatile content of 13% on a dry ash-free basis, the existing technology can reach 600-650mg / Nm3 (6% O2, dry flue gas), these concentrations are greatly Higher than the latest emission regulations as low as 50mg / Nm3 (6% O2, dry flue gas), therefore, it is necessary to further improve the burner design and improve burner performance to minimize the cost of flue gas denitrification to meet the lates...

AI Technical Summary

Problems solved by technology

[0002] The existing swirl burner technology for wall-type opposed combustion boilers has different NOx emissions depending on the coal quality. For dry ash-free bituminous coal with a volatile fraction of 36-38%, the NOx emissions that can be achieved with the existing technology are roughly 240-38%. 280mg / Nm3 (6% O2, dry flue gas), for lean coal with a volatile content of 13% on a dry ash-free basis, the existing technology can reach 600-650mg / Nm3 (6% O2, dry flue gas), these concentrations are greatly Higher than the latest emission regulations as low as 50mg / Nm3 (6% O2, dry flue gas), therefore, it is necessary to further improve the burner design and improve burner performance to minimize the cost of flue gas denitrification to meet the latest emission regulations

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