A swirl pulverized coal burner with secondary air offset for w-flame boiler

A technology of pulverized coal burner and secondary air, which is applied in the direction of burners, burners, and combustion methods for burning powder fuel, and can solve problems such as high NOx emissions, slagging and high-temperature corrosion, and high content of fly ash combustibles , to achieve the effects of reducing NOx generation, improving flame stability, and reducing the content of fly ash combustibles

Active Publication Date: 2018-03-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of high NOx emission, high content of fly ash combustibles, slagging and high-temperature corrosion of the water-cooled walls of the front and rear walls of the lower furnace of the W flame boiler with swirl pulverized coal burners arranged on the arch, the present invention proposes a Swirling pulverized coal burner for secondary air bias of W flame boiler

Method used

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  • A swirl pulverized coal burner with secondary air offset for w-flame boiler
  • A swirl pulverized coal burner with secondary air offset for w-flame boiler

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specific Embodiment approach 1

[0021] Specific implementation mode one: combine figure 1 with figure 2 Describe this embodiment, the primary air 14 of the swirling flow pulverized coal burner 4 of this embodiment and the division cylinder of the inner secondary air 15 are equipped with an annular inner secondary air block along the circumferential direction in the inner secondary air. 8. The circular inner secondary air block 8 has an angle of 180° along the circumferential direction, and a circular ring along the circumferential direction is installed inside the outer secondary air on the division cylinder of the inner secondary air 15 and the outer secondary air 16. The outer secondary wind block 9, the angle of the annular outer secondary wind block 9 along the circumferential direction is 180°, the boundary line of the annular inner secondary wind block 8 and the annular outer secondary wind block 9 along the diameter direction Parallel to the front and rear walls of the boiler, the annular inner seco...

specific Embodiment approach 2

[0022]Specific implementation mode two: combination figure 1 with figure 2 Describe this embodiment, the inner circular wall surface of the inner secondary wind block 8 of this embodiment is close to the outer wall of the primary air duct, and the inner circular wall surface of the outer secondary air block 9 is close to the outer wall of the inner secondary air duct. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0023] Specific implementation mode three: combination figure 1 with figure 2 This embodiment is described. In this embodiment, in the axial direction of the primary air pipe of the burner 4 , the front ends of the inner secondary air block 8 and the outer secondary air block 9 are flush with the end of the inner secondary air nozzle 6 . Other components and connections are the same as those in the second embodiment.

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Abstract

Disclosed is a secondary air offset whirl pulverized coal burner for a W flame boiler. The problems of high NOx discharge amount, high fly ash combustible matter content, slag-bonding to water walls of front and back walls of a lower combustion chamber and high temperature corrosion of the W flame boiler which is provided with an existing whirl pulverized coal burner on an arch are solved. A circular ring inner secondary air stop block in the circumferential direction is added in inner secondary air on a dividing cylinder of primary air and inner secondary air of the whirl pulverized coal burner; the angle of the circular ring inner secondary air stop block in the circumferential direction is 180 degrees; a circular ring outer secondary air stop block in the circumferential direction is added in outer secondary air on a dividing cylinder of the inner secondary air and the outer secondary air; the angle of the circular ring outer secondary air stop block in the circumferential direction is 180 degrees; the boundary line in the diameter direction of the circular ring inner secondary air stop block and the circular ring outer secondary air stop block is parallel to the front and back walls of the boiler; the circular ring inner secondary air stop block and the circular ring outer secondary air stop block are mounted on one side close to the center of a combustion chamber. The secondary air offset whirl pulverized coal burner is used for the W flame boiler.

Description

technical field [0001] The invention relates to a swirl pulverized coal burner for a W flame boiler, in particular to a swirl pulverized coal burner for secondary air bias of a W flame boiler, and belongs to the technical field of W flame boiler low nitrogen oxide combustion. Background technique [0002] At present, some domestic power plant boilers are W-flame boilers with swirl pulverized coal burners arranged on the arch. W Flame Boiler is a boiler designed for burning anthracite and lean coal. During the operation of this kind of boiler, there are common problems such as high NOx emission, high content of fly ash combustibles, high-temperature corrosion and slagging of the water-cooled walls of the front and rear walls of the lower furnace. [0003] W flame boiler NOx emission is high, up to 1500-1800mg / m 3 . NOx is toxic to animals and humans, is one of the main substances that form acid rain, is also an important substance that forms photochemical smog in the atmos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23D1/02F23C7/00
CPCF23C7/002F23D1/02
Inventor 陈智超王青祥曾令艳李争起李晓光车苗苗何额尔敦木图张佳刘一波
Owner HARBIN INST OF TECH
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