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W flame boiler with asymmetric front wall and rear wall secondary wind

A secondary air, asymmetric technology, applied in the field of W flame boilers and pulverized coal boilers, can solve the problems of large furnace negative pressure fluctuation, high fly ash combustible content, and poor boiler combustion stability.

Active Publication Date: 2019-06-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The asymmetry of the flow field in the W flame boiler furnace will affect the safe operation of the boiler, resulting in the following hazards: (1) high content of fly ash combustibles; (2) large fluctuations in the negative pressure of the furnace, poor combustion stability of the boiler, which may lead to fire extinguishing accidents, Seriously affect the economical and safe operation of the boiler

Method used

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  • W flame boiler with asymmetric front wall and rear wall secondary wind
  • W flame boiler with asymmetric front wall and rear wall secondary wind
  • W flame boiler with asymmetric front wall and rear wall secondary wind

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specific Embodiment approach 1

[0014] Specific implementation mode one: combine Figure 1-Figure 4 Describe this embodiment, the W-flame boiler with asymmetric secondary air on the front wall and rear wall described in this embodiment, it includes an upper furnace 1, a lower furnace 2, a front furnace arch 3 and a rear furnace arch 4, it includes an upper furnace Furnace 1, lower furnace 2, front furnace arch 3 and rear furnace arch 4, which also includes multiple first pulverized coal burners 5, multiple second pulverized coal burners 6, multiple secondary air nozzles 12 under the front arch and multiple secondary air nozzles 13 under the rear arch; multiple first pulverized coal burners 5 are installed on the front furnace arch 3 along the furnace width direction, and multiple second pulverized coal burners 6 are installed on the rear furnace along the furnace width direction On the arch 4, each first pulverized coal burner 5 includes a front arch primary air nozzle 7 and a front arch upper secondary air ...

specific Embodiment approach 2

[0015] Specific implementation mode two: combination figure 1 Describe this embodiment, the W-flame boiler with asymmetric secondary air on the front wall and rear wall described in this embodiment, it also includes a plurality of exhaust gas nozzles 11, and the plurality of exhaust gas nozzles 11 are installed obliquely along the width direction of the furnace. On the front wall 14, and the exhaust gas nozzle 11 is located above the secondary air nozzle 12 under the front arch, and a plurality of exhaust gas nozzles 11 are installed obliquely on the rear wall 15 along the width direction of the furnace, and the exhaust gas nozzle 11 is located on the second side of the rear arch. The top of the secondary wind spout 13. Other methods are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Specific implementation mode three: combination figure 2 Describe this embodiment, the W-flame boiler with asymmetric secondary air on the front wall and rear wall described in this embodiment, it also includes a plurality of exhaust gas nozzles 11, and the plurality of exhaust gas nozzles 11 are installed obliquely along the width direction of the furnace. On the front furnace arch 3, and the exhaust gas nozzle 11 is located between the secondary air nozzle 9 on the front arch and the front wall 14, and a plurality of exhaust gas nozzles 11 are installed obliquely on the rear furnace arch 4 along the furnace width direction, and the exhaust gas nozzle 11 is located between the secondary air nozzle 10 and the rear wall 15 on the rear arch. Other methods are the same as in the first embodiment.

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Abstract

The invention discloses a W flame boiler with asymmetric front wall and rear wall secondary wind, relates to a pulverized coal boiler, and aims at solving the problem of deflected internal flow fieldin a W flame boiler. The boiler comprises an upper furnace, a lower furnace, a front arch, a rear arch, multiple first pulverized coal combustion devices, multiple second pulverized coal combustion devices, multiple front arch lower secondary air nozzles and multiple rear arch lower secondary air nozzles. Each first pulverized coal combustion device comprises a front arch primary air nozzle and afront arch upper secondary air nozzle, each second pulverized coal combustion device comprises a rear arch primary air nozzle and a rear arch upper secondary air nozzle, multiple front arch lower secondary air nozzles are installed on a front wall in the width direction of the furnace, multiple rear arch lower secondary air nozzles are installed on the rear wall in the width direction of the furnace, the areas of cross sections of the front arch upper secondary air nozzles are smaller than that of the rear arch upper secondary air nozzles, and the areas of the cross sections of the front archlower secondary air nozzles are smaller than that of the rear arch lower secondary air nozzles. The invention belongs to the technical field of boiler combustion.

Description

technical field [0001] The invention relates to a pulverized coal boiler, in particular to a W-flame boiler with asymmetrical secondary air on the front wall and the rear wall, and belongs to the technical field of boiler combustion. Background technique [0002] Low-volatile coal such as anthracite and lean coal accounts for more than 40% of my country's power coal, which determines that a considerable part of my country's power stations must use low-volatile coal for power generation. In the 1980s and 1990s, my country began to introduce and popularize W-flame boilers designed for low-volatile coal. [0003] In actual operation, the flames in some W flame boiler furnaces do not form a symmetrical "W" shape, but form a "long front and short rear" flame, and the combustion is seriously asymmetrical. The reason is due to the asymmetry of the W flame boiler structure Severe deflection of the lower furnace flow field caused by the [0004] The asymmetry of the flow field in t...

Claims

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Application Information

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IPC IPC(8): F23C5/08F23C7/02F23L9/00
Inventor 陈智超李争起张鑫王青祥闫天舒曾令艳
Owner HARBIN INST OF TECH
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