Gap type exhaust gas rear W flame boiler with secondary air on arch and air distribution method

A gap type, secondary air technology, applied in the field of boiler combustion, can solve the problems of high NOx emissions, late ignition of pulverized coal airflow, unstable combustion, etc., to reduce NOx emissions, strengthen the level of graded combustion, and prevent slagging Effect

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

[0004] The present invention aims to solve the problems of high NOx emission of W flame boilers, late ignition of pulverized coal airflow, unstable combustion, and slagging of front and rear walls, and further provides a gap-type exhausted post-installed W flame boiler with secondary air arranged on the arch. Air distribution method

Method used

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  • Gap type exhaust gas rear W flame boiler with secondary air on arch and air distribution method
  • Gap type exhaust gas rear W flame boiler with secondary air on arch and air distribution method
  • Gap type exhaust gas rear W flame boiler with secondary air on arch and air distribution method

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specific Embodiment approach 1

[0028] Specific implementation mode one: combine figure 2 and Figure 4To illustrate this embodiment, in this embodiment, a slot-type exhausted post-mounted W flame boiler with secondary air on the arch is arranged, which includes an upper furnace 1, a lower furnace 2, a front furnace arch 3 and a rear furnace arch 4, an upper furnace 1, The front furnace arch 3, the lower furnace 2 and the rear furnace arch 4 constitute the furnace body, which also includes two rows of double-cyclone thick-lean pulverized coal burners 5, and each row of double-cyclone thick-lean pulverized coal burners 5 includes multiple double-cyclone thick-lean pulverized coal burners. Pulverized coal burner 5, a plurality of thick and thin pulverized coal burners 5 with double cyclones are symmetrically arranged in a line and installed on the front furnace arch 3 and rear furnace arch 4, and the double cyclone thick and thin pulverized coal burners 5 include the secondary Air spout 7, two peripheral air...

specific Embodiment approach 2

[0029] Specific implementation mode two: combination Figure 4 To illustrate this embodiment, the section of the slit-type exhaust gas nozzle 6 in this embodiment is rectangular, and the sum of the cross-sectional areas of the four slit-type exhaust gas nozzles 6 of each double-cyclone rich-lean pulverized coal burner 5 is equal to that of a single exhaust gas nozzle. The cross-sectional area of ​​the pipes is equal.

[0030] Other compositions and connections are the same as in the first embodiment.

specific Embodiment approach 3

[0031] Specific implementation mode three: combination Figure 4 To illustrate this embodiment, in this embodiment, four slit-type exhaust gas nozzles 6 are symmetrically arranged on both sides of the secondary air nozzle 7 on the arch along the center line in the longitudinal direction, and two thick coal powder airflow nozzles 9 are symmetrically arranged on two sides of the arch. The secondary air nozzle 7 is along both sides of the center line in the length direction.

[0032] Other compositions and connections are the same as those in the second embodiment.

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Abstract

The invention provides a gap type exhaust gas rear W flame boiler with secondary air on an arch and an air distribution method, and relates to a coal-fired power station boiler. The gap type exhaust gas rear W flame boiler with the secondary air on the arch and the air distribution method aim to solve the problems that a W flame boiler is high in NOx emission, coal dust airflow is ignited late, combustion is unstable, and front and rear walls are slagged. The gap type exhaust gas rear W flame boiler with the secondary air on the arch further comprises two rows of double-cyclone-barrel rich andlean coal dust combustors, wherein each double-cyclone-barrel rich and lean coal dust combustor comprises a secondary air nozzle on the arch, peripheral air nozzles, rich coal dust airflow nozzles and gap type exhaust gas nozzles; and the gap type exhaust gas nozzles are symmetrically arranged on the two sides of the secondary air nozzle on the arch, the two rich coal dust airflow nozzles are symmetrically arranged on the two sides of the secondary air nozzle on the arch, and the secondary air nozzle on the arch, the two peripheral air nozzles, the two rich coal dust airflow nozzles and the four gap type exhaust gas nozzles communicate with a lower hearth. The gap type exhaust gas rear W flame boiler with the secondary air on the arch and the air distribution method belong to the technical field of boiler combustion.

Description

technical field [0001] The invention relates to a boiler for a coal-fired power station, in particular to a gap-type exhausted gas rear-mounted W-flame boiler arranged on an arch and a method for air distribution, and belongs to the technical field of boiler combustion. Background technique [0002] W Flame Boiler is a utility boiler specially designed for burning low volatile and refractory coal. It has the advantages of high furnace temperature and long combustion stroke of pulverized coal airflow. China has introduced W flame boilers from North Africa and Western Europe since the 1990s. Due to the rich reserves of anthracite and lean coal resources in China, and the low price compared with other power coals, W flame boilers were widely used soon and became one of the main furnace types for thermal power generation. At present, China has more than 130 W-flame boilers under construction and has been built, with a total installed capacity of more than 41,000MW, accounting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C7/00F23C5/08F23L9/00F23K3/02
CPCF23C5/08F23C7/002F23K3/02F23L9/00Y02E20/34
Inventor 曾令艳杜贺谭紫莹李争起郑智巍陈智超朱群益
Owner HARBIN INST OF TECH
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