Method for arch single-stage injection fractional combustion and W flame boiler for realizing method

A graded combustion, single-stage technology, applied in the direction of combustion method, combustion chamber, combustion type, etc., can solve the problems of high content of fly ash combustibles, late ignition of pulverized coal airflow, poor flame stability, etc., and achieve the content of fly ash combustibles The effects of lowering, lower ignition temperature, and enhanced combustion stability

Active Publication Date: 2010-09-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the invention is to solve the existence of NO in W flame boiler operation x High emissions, high content of fly ash combustibles, serious slagging of the water wall on the front wall and rear wall of the lower furnace, late ignition of the pulverized coal airflow and poor flame stability, and then provide a single-stage ejection staged combustion on the arch The method and the W flame boiler that realizes this method

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  • Method for arch single-stage injection fractional combustion and W flame boiler for realizing method
  • Method for arch single-stage injection fractional combustion and W flame boiler for realizing method
  • Method for arch single-stage injection fractional combustion and W flame boiler for realizing method

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specific Embodiment approach 1

[0037] Specific implementation mode 1: Combination figure 1 with figure 2 To explain the present embodiment, the method of single-stage ejection and staged combustion on the arch of this embodiment is realized as follows: on the fore furnace arch 3 of the furnace, from the center of the furnace 2-1 to the water wall 2-2 of the front wall of the furnace And on the rear furnace arch 15 of the furnace, a plurality of dense coal air flow nozzles and a plurality of secondary air nozzles 10 on the arch are sequentially arranged from the furnace center 2-1 to the water wall 2-3 of the furnace rear wall. Two dense coal air flow nozzles are arranged adjacent to the corresponding secondary air nozzles 10 on the arch, on the forehearth arch 3 of the furnace, from the center of the furnace 2-1 to the water wall 2-2 of the front wall of the furnace and in the furnace There are also a plurality of light coal air flow nozzles 11 on the rear furnace arch 15 from the furnace center 2-1 to the ...

specific Embodiment approach 2

[0038] Specific implementation manner two: combination figure 1 To describe this embodiment, the angle α between the center line of the under-arch secondary air nozzle 12 and the horizontal plane in this embodiment is 45°. When the downward offset angle of the secondary air 8 under the arch is too large, the downward depth of the pulverized coal gas flow will be too large and the cold ash hopper 4 will be washed away, causing the cold ash hopper 4 to slag, and the secondary air 8 under the arch will be deflected downward. The setting of 45° can not only ensure that the concentrated pulverized coal gas flow 5 has a sufficient depth of down shot in the lower furnace 1, but also can prevent the cold ash hopper 4 from slagging. Others are the same as the first embodiment.

specific Embodiment approach 3

[0039] Specific implementation mode three: combination figure 1 with figure 2 To explain this embodiment, the W-flame boiler with single-stage ejection and staged combustion on the arch of this embodiment includes a furnace composed of a lower furnace 1, an upper furnace 2, and two furnace arches, as well as multiple dense coal gas flow nozzles, and multiple The pulverized coal air flow nozzle 11 and a plurality of secondary air nozzles 12 under the arch, the two furnace arches are the front furnace arch 3 and the rear furnace arch 15 respectively; the W flame boiler also includes a plurality of secondary air nozzles 10 on the arch, On the fore furnace arch 3 of the furnace, from the furnace center 2-1 to the water wall 2-2 of the front wall of the furnace, and on the rear furnace arch 15 of the furnace from the furnace center 2-1 to the water wall 2 of the rear wall of the furnace There are a plurality of dense coal air flow nozzles and a plurality of secondary air nozzles 10...

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Abstract

A method for arch single-stage injection fractional combustion and a W flame boiler for realizing the method relate to a fractional combustion method and a W flame boiler. The invention aims at the problems that the W flame boiler has high NOx discharge, high flying ash combustible content, serious lagging on water cool wall front and behind a lower hearth and inferior flame stability. The method of the invention comprises the steps of gradually injecting through arch secondary air with an air speed of 35 to 65 m/s, taking thick coal powder airflow with the air speed of 10 to 20 m/s to inject downwards, and injecting the arch secondary air with the air speed of 35 to 65 m/s into the furnace through an arch secondary air nozzle. The boiler of the invention comprises a thick coal powder airflow nozzle, an arch secondary air nozzle and a thin coal powder airflow nozzle which are arranged on the furnace arch from the center of the furnace to the front and back water cool walls, wherein the thick coal powder airflow nozzle is abutted to the arch secondary air nozzle and an arch lower secondary air nozzle is arranged on the front and back water cool walls on the lower furnace along the width direction of the furnace. The W flame boiler for realizing the method of the invention can decrease the W flame boiler and the flying ash combustible content.

Description

Technical field [0001] The invention relates to a staged combustion method and a W flame boiler, belonging to the technical field of W flame boiler combustion. Background technique [0002] The W flame combustion boiler is a boiler specially designed for burning anthracite and lean coal. In order to meet the needs of ignition and stable combustion of this kind of non-burnable coal, the furnace must maintain a high temperature level, which leads to NO x The emission level is obviously high. W-flame boilers usually have the following technical characteristics: dense pulverized coal air flow, light pulverized coal air flow and secondary air are arranged on the arch, and secondary air under the arch is arranged on the water wall of the front wall and the back wall under the arch; it adopts dense and light combustion, dense coal The concentration of pulverized coal in the air flow is relatively high, and its pulverized coal content accounts for about 85% of the total pulverized coal c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C5/08F23L9/00F23M5/06
Inventor 李争起陈智超况敏朱群益曾令艳刘春龙杨连杰吴远刚胡志勇张佳徐善田申珊平杨志强
Owner HARBIN INST OF TECH
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