Multi-level separation annular backflow type axial cyclone burner

A technology of axial swirling and multi-stage separation, applied in the direction of burners, burners burning powder fuel, combustion methods, etc., to achieve the effects of maintaining flame stability, facilitating NOx reduction, and reducing NOx formation

Inactive Publication Date: 2016-12-07
HARBIN BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Multi-level separation annular backflow type axial cyclone burner
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  • Multi-level separation annular backflow type axial cyclone burner

Examples

Experimental program
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Effect test

Embodiment 1

[0033]A multi-stage separation annular return type axial swirl burner, its composition includes: a primary air powder system, a total secondary air system, the primary air powder system includes a primary air pipe elbow 1, the primary air The pipe elbow is connected to the horizontal section 2 of the primary air pipe through a flange, and the outlet end of the horizontal section of the primary air pipe is connected to a multi-toothed burner 7 with a small flare through a specially designed bolt. A secondary air duct 10 is installed on the outside of the horizontal section of the primary air duct, and a tertiary air duct 11 is installed on the outside of the secondary air duct. Air flaring 17, this flaring is connected with described tertiary air duct by welding mode and reinforcing plate, described tertiary air duct is equipped with quaternary air duct 12 outside, described primary air duct horizontal section and secondary air duct Pipe, the secondary air duct and the tertiary...

Embodiment 2

[0035] According to the multi-stage separation annular return type axial swirl burner described in embodiment 1, a crescent-shaped pulverized coal distributor 3 is installed on the upper part of the inlet end of the horizontal section of the primary air pipe, and the horizontal section of the primary air pipe is A venturi pulverized coal concentrator 4 is installed near the outlet end of the section, and a central air duct assembly 5 is installed at the center of the horizontal section of the primary air duct. The outlet end of the central air duct assembly is connected to the primary air duct through a bracket. The horizontal section is connected, the inlet end is connected to the elbow of the primary air pipe through the inclined flange, the oil gun assembly 6 is installed at the center of the central air pipe assembly, and the outlet end of the oil gun assembly is supported by the impeller on the In the central air duct assembly, the inlet end is connected to the inlet end o...

Embodiment 3

[0037] According to the multi-stage separation annular return type axial swirl burner described in embodiment 1 or 2, the total secondary air system includes an air box 8, and the air box is welded to the horizontal section of the primary air pipe It is connected with the four air ducts, and the main air brake assembly 9 is installed on the outside of the air box, and the general air brake assembly is a coaxial cylinder located outside the air box, through its pulleys, guide rails and connecting rods It can be moved in the axial direction to adjust the opening of the air door. The near outlet end of the tertiary air duct is arranged with a tertiary air swirl adjustment mechanism 15. This adjustment mechanism is installed on the circumference of the tertiary air duct. Axial swirl blades, each blade is connected to a ring plate installed outside the quaternary air duct through its positioning shaft and drive link, and the near outlet end of the quaternary air duct is equipped wit...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D1/02
CPCF23D1/02
Inventor 吴章发张彦军王凤君刘恒宇栾世健于景泽王通佟力朱绘娟崔成云
Owner HARBIN BOILER
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