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Swirling combustion device provided with pre-combustion chamber and adopting flue gas recirculation multiple radial grading

A flue gas recirculation and combustion device technology, which is applied in the directions of burners, combustion methods, combustion types, etc., can solve the problems of poor stable combustion performance at low loads, high content of combustibles in fly ash, and high NOx emissions. The effect of slagging in the furnace and pre-combustion chamber, which is beneficial to burnout and prolonging the residence time

Inactive Publication Date: 2019-04-16
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 poor low-load stable combustion performance of the current industrial pulverized coal boilers, high NOx emissions, high content of fly ash combustibles and serious slagging, the invention further proposes the use of flue gas recirculation for multiple radial classifications with pre-combustion swirl burner

Method used

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  • Swirling combustion device provided with pre-combustion chamber and adopting flue gas recirculation multiple radial grading
  • Swirling combustion device provided with pre-combustion chamber and adopting flue gas recirculation multiple radial grading

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specific Embodiment approach 1

[0033] Specific implementation mode one: combine figure 1 and figure 2 This embodiment is described. The swirl combustion device with a pre-combustion chamber that adopts flue gas recirculation for multiple radial classifications in this embodiment includes a pulverized coal combustion system and a flue gas recirculation system. The pulverized coal combustion system includes Swirling pulverized coal burner 1, pre-combustion chamber 2 and multiple separation air nozzles 3, the flue gas recirculation system includes recirculation flue gas pipeline valve 5, recirculation flue gas pipeline 6, recirculation flue gas branch pipeline 7 And recirculation fan 8, swirl pulverized coal burner 1 is arranged on the boiler through pre-combustion chamber 2, swirl pulverized coal burner 1 includes primary air duct 1-1, secondary air duct 1-2 in swirl, swirl Outflow secondary air pipe 1-3, secondary air air pipe valve 4 and separation air pipe valve 13, one end of secondary air pipe 1-2 in s...

specific Embodiment approach 2

[0036] Specific implementation mode two: combination figure 1 and figure 2 Describe this embodiment, the primary air duct 1-1, the secondary air duct 1-2 in the swirl flow, and the swirl flow combustion device of the swirl flow combustion device that adopts flue gas recirculation for multiple radial classifications and has a pre-combustion chamber. The outer secondary air duct 1-3 is coaxially arranged, and the axis of the primary air duct 1-1, the axis of the swirling inner secondary air duct 1-2, and the axis of the swirling outer secondary air duct 1-3 are all in line with the preset The wall of the combustion chamber 2 is vertical. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0037] Specific implementation mode three: combination figure 1 and figure 2 This embodiment is described. The distance between the centerline of the separation air nozzle 3 and the axis of the air pipes of each stage of the swirl burner 1 is described in this embodiment, which adopts flue gas recirculation for multiple radial classifications and has a pre-combustion chamber. The included angle β is 0°~60°. Other components and connections are the same as those in the first embodiment.

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Abstract

The invention relates to a swirling combustion device, in particular to a swirling combustion device provided with a pre-combustion chamber and adopting flue gas recirculation multiple radial grading.The problems of poor low-load stable combustion performance, high NOx emission, high fly ash combustible matter content and serious slagging of an industrial pulverized coal boiler at present are solved. The swirling combustion device comprises a pulverized coal combustion system and a flue gas recirculation system, the pulverized coal combustion system comprises a swirling pulverized coal burner, the pre-combustion chamber and a plurality of separation air spraying openings, the flue gas recirculation system comprises a recirculation flue gas pipeline valve, a recirculation flue gas pipeline, a recirculation flue gas branch pipeline and a recirculation fan, the swirling pulverized coal burner is arranged on a boiler through the pre-combustion chamber, the swirling pulverized coal burnercomprises a primary air pipe, a swirling inner secondary air pipe, a swirling outer secondary air pipe, a secondary air pipeline valve and a separation air pipeline valve, one end of the swirling inner secondary air pipe is mounted in one end of the primary air pipe in an inserted mode, and one end of the swirling outer secondary air pipe is mounted in the other end of the swirling inner secondaryair pipe in an inserted mode. The invention belongs to the field of industrial boiler equipment.

Description

technical field [0001] The invention relates to a swirl combustion device, in particular to a swirl combustion device which adopts flue gas recirculation for multiple radial classifications and has a pre-combustion chamber, and belongs to the field of industrial boiler equipment. Background technique [0002] The total number of coal-fired industrial boilers in my country is close to 600,000, and the annual coal consumption is nearly 640 million tons. Compared with the chain furnace, the industrial pulverized coal boiler adopts the chamber combustion combustion method, and the pulverized coal particles are carried by the air into the furnace for combustion, which has a higher boiler thermal efficiency. [0003] For the research on industrial pulverized coal boilers, developed countries dominated by Germany have formed different technical schools such as Dr. Schoppe, HM, Pillard and Saacke in the past 30 years. Among them, the Zack CONOx-UCC burner adopts segmented air suppl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C7/02F23C9/00F23D1/02
CPCF23C7/02F23C9/003F23D1/02
Inventor 陈智超严蓉王亮曾令艳李争起
Owner HARBIN INST OF TECH
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