Multi-level separation annular backflow type axial cyclone burner

Abstract

The invention discloses a multi-level separation annular backflow type axial cyclone burner. According to the existing cyclone burner technology, emission of NOx needs to be further reduced, and the burn-off rate needs to be further increased. A primary air pipe bend (1) and a primary air pipe horizontal section (2) are connected. A center air pipe assembly (5) is arranged in the center of the primary air pipe horizontal section, a pulverized coal uniform distributor (3) is arranged at an inlet, a Venturi pulverized coal concentrator (4) is arranged close to an outlet, and the outlet is connected with a burning stabilizer (7). A secondary air pipe (10) and a secondary air brake (13) are arranged at the outer portion of the primary air pipe horizontal section. A tertiary air pipe (11) and a tertiary air brake (14) are arranged at the outer portion of the secondary air pipe. An outlet of the tertiary air pipe is connected with a tertiary air flaring (17). The tertiary air pipe is provided with a tertiary air cyclone adjusting mechanism (15). A quartic air pipe (12) is arranged at the outer portion of the tertiary air pipe and provided with a quartic air cyclone adjusting mechanism (16), and an outlet of the quartic air pipe is connected with a water wall tube panel (18). The multi-level separation annular backflow type axial cyclone burner is used in the field of multi-level separation annular backflow type axial cyclone burners.

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 annular 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 19% on a dry ash-free basis, the existing technology can reach 450mg / Nm3 (6% O2, dry flue gas), these concentrations are much higher than The latest emission regulations are currently 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 t...

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 19% on a dry ash-free basis, the existing technology can reach 450mg / Nm3 (6% O2, dry flue gas), these concentrations are much higher than The latest emission regulations are currently 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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