Multistage separation center backflow axial cyclone burner

An axial swirl, multi-stage separation technology, applied in burners, burners for burning powder fuel, combustion methods, etc., to reduce the generation of NOx, promote the ignition of pulverized coal, and have strong adaptability to coal types.

Active Publication Date: 2016-10-26
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 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

Method used

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  • Multistage separation center backflow axial cyclone burner
  • Multistage separation center backflow axial cyclone burner
  • Multistage separation center backflow axial cyclone burner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A multi-stage separation center 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 the flange, and the secondary air pipe 10 is installed on the outside of the horizontal section of the primary air pipe. Angle secondary air duct flaring 17, this flaring is connected with the secondary air duct by welding and reinforcing plate, the outside of the secondary air duct is equipped with a tertiary air duct 11, and the outlet end of the tertiary air duct is set There is a tertiary air duct flaring 18 with a certain angle with the axial direction. This flaring is connected with the tertiary air duct by welding and reinforcing plate. The tertiary air duct 12 is installed outside the tertiary air duct. The horizontal section of the primary air duc...

Embodiment 2

[0029] According to the multi-stage separation center 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 duct, and the horizontal section of the primary air duct 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, and the outlet end of the central air duct assembly is connected to the horizontal section of the primary air duct through a bracket , the inlet end is connected to the elbow of the primary air duct through an inclined flange, the outlet end of the central air duct assembly is welded to the combustion-stabilizing ring 7, and an oil gun assembly 6 is installed at the center of the central air duct assembly , the outlet end of the oil gun assembly is supported in the central...

Embodiment 3

[0031]According to the multi-stage separation center 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 with the horizontal section of the primary air pipe and the four The air ducts are connected, 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, which can move axially through its pulleys, guide rails and connecting rods. To adjust the opening of the damper, a tertiary air swirl adjustment mechanism 15 is arranged near the outlet end of the tertiary air duct. This adjustment mechanism is to install a group of axial swirl blades arranged at equal intervals on the circumference of the tertiary air duct passage. Each blade is connected to a ring plate installed on the outside of the quaternary air duct through its positioning shaft and drive link. The quaternary air swirl adjus...

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PUM

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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...

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佟力沈涛朱绘娟
Owner HARBIN BOILER
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