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On-arch secondary air and gap type exhaust steam staggered W flame boiler and air distribution method

A slit type, secondary air technology, applied in the air distribution of W flame boilers and coal-fired power plant boilers, can solve the problems of late ignition of pulverized coal airflow, unstable combustion, high NOx emissions, etc., to extend the burnout distance, Effect of preventing slagging and reducing NOx emission level

Active Publication Date: 2020-08-07
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the common problems of high NOx emission, late ignition of pulverized coal airflow, unstable combustion, and slagging of the front and rear walls which cannot be fundamentally changed during the operation of the W flame boiler, and further provides secondary air and gaps on the arch W-flame boiler with interlaced exhaust gas and its air distribution method

Method used

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  • On-arch secondary air and gap type exhaust steam staggered W flame boiler and air distribution method
  • On-arch secondary air and gap type exhaust steam staggered W flame boiler and air distribution method
  • On-arch secondary air and gap type exhaust steam staggered W flame boiler and air distribution method

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specific Embodiment approach 1

[0031] Specific implementation mode one: combine figure 2 and Figure 4 To illustrate this embodiment, in this embodiment, a W-flame boiler with secondary air on the arch and slit-type exhaust gas interlaced, it includes an upper furnace 1, a lower furnace 2, a front furnace arch 3 and a rear furnace arch 4, an upper furnace 1, a front furnace Furnace arch 3, lower hearth 2 and rear furnace arch 4 constitute the furnace body, which also includes two rows of double cyclone thick and thin pulverized coal burners 5, and each row of double cyclone thick and thin pulverized coal burners 5 includes multiple double cyclone thick and thin coal Pulverized coal burner 5, a plurality of thick and thin pulverized coal burners 5 with double cyclones are arranged symmetrically in a line and installed on the front furnace arch 3 and the rear furnace arch 4, and the double cyclone thick and thin pulverized coal burners 5 include a set of gap type exhaust Air nozzle assembly 6, a group of sl...

specific Embodiment approach 2

[0032] Specific implementation mode two: combination Figure 4 To illustrate this embodiment, a set of slit-type exhaust nozzle assemblies 6 in this embodiment includes a second slit-type exhaust nozzle 6-2 and two first slit-type exhaust nozzles 6-1; a set of slit-type exhaust nozzles 6-1; The upper secondary air nozzle assembly 7 includes a first slit-type arched secondary air nozzle 7-1 and two second slit-type arched secondary air nozzles 7-2; two first slit-type exhaust air nozzles 6-1 Arranged in parallel, the two second slit-type arch secondary air nozzles 7-2 are arranged in parallel, the first slit-type arch upper secondary air nozzle 7-1 is arranged between the two first slit-type exhaust gas nozzles 6-1 , the second slit-type exhaust gas nozzle 6-2 is arranged between the two second slit-type arched secondary air nozzles 7-2, and the two second slit-type arched secondary air nozzles 7 on the front furnace arch 3 -2 is set close to the front wall of the lower furnac...

specific Embodiment approach 3

[0034] Specific implementation mode three: combination Figure 4 To illustrate the present embodiment, the distance between the centers of the two concentrated pulverized-coal airflow nozzles 9 on each double-cyclone dense-lean pulverized-coal burner 5 described in this embodiment is 3 to 6 times the diameter of the pulverized-coal flow nozzle 9 .

[0035] Other compositions and connections are the same as those in the second embodiment.

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Abstract

The invention discloses an on-arch secondary air and gap type exhaust steam staggered W flame boiler and an air distribution method and relates to a coal-fired power plant boiler. The on-arch secondary air and gap type exhaust steam staggered W flame boiler and the air distribution method aim at solving the problems common existing in the W flame boiler running process, according to the problems,the NOx discharge is high, the coal dust airflow catching is late, combustion is not stable, front and rear wall slag bonding is generated, and the above problems cannot be changed fundamentally. Theon-arch secondary air and gap type exhaust steam staggered W flame boiler comprises two rows of double-cyclone-cylinder dense-lean coal dust combustors, the multiple double-cyclone-cylinder dense-leancoal dust combustors are linearly arranged and symmetrically installed on a front furnace arch and a rear furnace arch. Each double-cyclone-cylinder dense-lean coal dust combustor comprises a gap type exhaust steam spraying opening assembly, a gap type on-arch secondary air spraying opening assembly, a surrounding air spraying opening and a dense coal dust airflow spraying opening. The gap type exhaust steam spraying opening assemblies and the gap type on-arch secondary air spraying opening assemblies are arranged alternately. The on-arch secondary air and gap type exhaust steam staggered W flame boiler and the air distribution method belong to the technical field of boiler combustion.

Description

technical field [0001] The invention relates to a coal-fired power plant boiler, in particular to an air distribution method for a W-flame boiler in which the secondary air on the arch and the gap-type exhaust gas are interlaced, and belongs to the technical field of boiler combustion. Background technique [0002] Thermal power generation is the main power generation method in China. In order to implement the scientific concept of development, improve power generation efficiency, and achieve clean power generation, China's thermal power generation is gradually transforming into an efficient, clean and environmentally friendly power generation method. In 2018, China's power generation once again ranks first in the world, reaching nearly 6.8 trillion kWh, a year-on-year increase of 6.8%. From the perspective of power generation composition, China's total thermal power generation in 2018 reached 4,979.47 billion kWh (a year-on-year increase of 6%), accounting for 73.23% of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C7/00F23C5/08F23K3/02F23L9/00
CPCF23C5/08F23C7/002F23K3/02F23L9/00
Inventor 杜贺李争起谭紫莹郑智巍曾令艳陈智超朱群益
Owner HARBIN INST OF TECH
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