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Turbulent burner with primary air with multiple channels

A swirl burner, multi-channel technology, applied in burners, burners burning powder fuel, combustion types, etc., can solve problems such as poor combustion stability and reduced secondary air volume, and achieve stable combustion performance. Circulation cross-sectional area, the effect of avoiding powder blocking

Pending Publication Date: 2022-07-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problem that the existing burner mainly has a decrease in the secondary air volume when the load is reduced, which is not conducive to the formation of a large-sized central recirculation zone at the outlet of the swirl burner, resulting in poor combustion stability. A primary air swirl burner with multiple channels

Method used

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  • Turbulent burner with primary air with multiple channels
  • Turbulent burner with primary air with multiple channels
  • Turbulent burner with primary air with multiple channels

Examples

Experimental program
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specific Embodiment approach 1

[0029] Embodiment 1: Combining figure 1 Illustrating this embodiment, a primary air with multi-channel swirl burner described in this embodiment, its specific structure includes a multi-stage primary air channel 1, an inner secondary air channel 2, an outer secondary air channel 3, Powder feeding pipeline 4, powder feeding control valve 5 and powder feeding bin 6;

[0030]The output end of the powder feeding pipeline 4 is connected with the input end of the multi-stage primary air channel 1, and the outer surface of the output end of the multi-stage primary air channel 1 is sleeved with an inner secondary air channel 2, and the outer surface of the inner secondary air channel 2 is sleeved. The outer secondary air channel 3 is sleeved on the surface, and the outer surface of the input end of the powder feeding pipe 4 is provided with a through hole, and the inner wall of the through hole is connected with the output end of the powder feeding bin 6, and the output end of the pow...

specific Embodiment approach 2

[0033] Specific implementation mode 2: Combining figure 1 This embodiment will be described. This embodiment is a further limitation of the swirl burner described in Embodiment 1. The primary air with multi-channel swirl burner described in this embodiment has multiple The primary primary air channel 1, the inner secondary air channel 2 and the outer secondary air channel 3 are coaxially arranged.

specific Embodiment approach 3

[0034] Specific implementation three: combination figure 1 This embodiment will be described. This embodiment is a further limitation of the swirl burner described in Embodiment 1. The primary air with multi-channel swirl burner described in this embodiment has multiple Primary primary air channel 1 includes primary primary air channel 1-1, secondary primary air channel 1-2, primary primary air channel 1-3, primary primary air channel 1-4, primary primary air channel 1-5 , Level 6 primary air channel 1-6, Level 7 primary air channel 1-7, Level 8 primary air channel 1-8, Level 9 primary air channel 1-9 and Level 10 primary air channel 1-10;

[0035] The outer surface of the first-level primary air channel 1-1 is sequentially covered with the second-level primary air channel 1-2, the third-level primary air channel 1-3, the fourth-level primary air channel 1-4, and the fifth-level primary air channel 1-5. , Level 6 primary air channel 1-6, Level 7 primary air channel 1-7, Level...

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Abstract

The invention discloses a primary air turbulent burner with multiple channels, and relates to the technical field of burners. In order to solve the problems that under the condition of load reduction of an existing burner, secondary air volume is mainly reduced, a large-size center backflow area is not formed at an outlet of a turbulent burner, and therefore combustion stability is poor. During peak regulation and load reduction of the boiler, primary air channels are closed step by step from the center of the combustor to the outside in the radial direction, the circulation sectional area and position of the primary air are changed under the condition that the primary air speed is basically unchanged, the closed part of the primary air channels play a role of a bluff body at the center of the combustor, a negative pressure area is generated in the center of the combustor, and the combustion efficiency is improved. And formation of a central backflow area is promoted, so that the effect of rotational flow secondary air on the backflow area is counteracted, heating of pulverized coal airflow by high-temperature flue gas in the entrainment furnace is facilitated, and the boiler has good stable combustion performance during low-load operation. The burner is suitable for the technical field of burners.

Description

technical field [0001] The invention relates to the technical field of burners, in particular to a primary air swirl burner with multiple channels. Background technique [0002] In 2021, the state proposes the technical route of carbon peaking and carbon neutrality, and vigorously develops new energy. This requires coal-fired power plants to do a good job in deep peak regulation. Therefore, power plant boilers must meet the technical requirements for stable combustion at low loads. . In the hedging power station, the swirl burner is usually used. When the boiler load is reduced, in order to ensure the normal delivery of pulverized coal, the primary air volume will remain unchanged or slightly decrease, mainly by reducing the secondary air volume. The secondary wind is usually swirl wind, and the rotation capacity is reduced due to the decrease in air volume, which is not conducive to the formation of a recirculation zone, and the stability is weak. At present, the minimum ...

Claims

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Application Information

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IPC IPC(8): F23D1/02F23L1/00F23L9/00F23K3/02
CPCF23D1/02F23L1/00F23L9/00F23K3/02
Inventor 袁振华陈智超吴晓岚李争起
Owner HARBIN INST OF TECH
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