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Multi-ejection grading combustion method and W flame boiler device for realizing same

A technology of staged combustion and multiple injection, which is applied in the combustion method, staged combustion, and combustion with various fuels, etc., can solve the problems of high fly ash combustible content, late ignition of pulverized coal gas flow, and poor flame stability. The effect of reduced fly ash combustible content, ignition advance, 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, severe 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 method of multi-injection staged combustion And realize the W flame boiler device of this method

Method used

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  • Multi-ejection grading combustion method and W flame boiler device for realizing same
  • Multi-ejection grading combustion method and W flame boiler device for realizing same
  • Multi-ejection grading combustion method and W flame boiler device for realizing same

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specific Embodiment approach 1

[0021] Specific implementation mode one: combine figure 1 and figure 2 Illustrate this embodiment, a kind of multi-injection staged combustion method of this embodiment is realized in this way: on the front furnace arch 3 of the furnace, from the furnace center 2-1 side to the front wall water-cooled wall 2-2 of the furnace Between the back furnace arch 15 of the furnace and from the furnace center 2-1 side to the rear wall water wall 2-3 of the furnace, there are a plurality of dense pulverized coal airflow nozzles 10 and a plurality of internal secondary air nozzles 11. , a plurality of light pulverized coal airflow spouts 12 and a plurality of outer secondary air spouts 13, the dense coal pulverized airflow 5 is sprayed into the lower furnace 1 by a plurality of thick coal pulverized airflow spouts 10, and the inner secondary air 6 is formed by a plurality of inner secondary air The secondary air nozzle 11 is injected into the lower furnace 1, the light coal powder airfl...

specific Embodiment approach 2

[0022] Specific implementation mode two: combination figure 1 To describe this embodiment, the included angle α between the center line of the secondary air nozzle 14 under the arch and the horizontal plane in this embodiment is 45°. When the downward deflection angle of the secondary air 9 under arch is too large, it will cause the pulverized coal airflow to shoot down too deeply and scour the cold ash hopper 4, thus causing slagging in the cold ash hopper 4, and the secondary air 9 under arch will deflect downward. Setting it at 45° can not only ensure that the dense pulverized coal airflow 5 has a sufficient downward injection depth in the lower furnace 1, but also avoid slagging of the cold ash hopper 4. Others are the same as the first embodiment.

specific Embodiment approach 3

[0023] Specific implementation mode three: combination figure 1 and figure 2 Illustrate this embodiment, the W-flame boiler device of multi-injection staged combustion of this embodiment comprises the furnace hearth that is made of lower furnace 1, upper furnace 2 and two furnace arches and a plurality of dense pulverized coal air flow spouts 10, a plurality of Light coal pulverized air flow nozzle 12 and a plurality of secondary air nozzles 14 under the arch, the two furnace arches are respectively the front furnace arch 3 and the rear furnace arch 15; the device of this embodiment also includes a plurality of secondary air nozzles arranged in stages, A plurality of secondary air nozzles arranged in stages are respectively a plurality of inner secondary air nozzles 11 and a plurality of outer secondary air nozzles 13; on the front furnace arch 3 from the furnace center 2-1 side to the front wall water wall 2 of the furnace Between -2 and between the rear furnace arch 15 fr...

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Abstract

The invention discloses a W flame boiler device for realizing a multi-ejection grading combustion and a method thereof, and relates to a W flame boiler device of a grading combustion and a method, which aims at the problems of high NOx exhaust, high fly ash combustible material content, late fire of the pulverized coal airflow and bad flame stability in the W type flame boiler referred in the background technology.The method comprises the following steps of: ejecting internal and external secondary air at the air speed of 35-65m / s step by step and downwards ejecting by carrying a concentrated coal dust airflow at the air speed of 10-20m / s to realize first and second stage grading combustion; and injecting arch lower secondary air at the air speed of 35-65m / s into the lower heath by an arch lower secondary air nozzle to realize third stage grading combustion. A concentrated coal dust airflow nozzle, an internal secondary air nozzle, a light coal dust airflow nozzle and an external secondary air nozzle are sequentially distributed from the center side of the hearth to the water-cooling wall of the front and rear wall of the lower hearth on a boiler arch; and the front and rear wall of the lower hearth is provided with the arch lower secondary air nozzle along the width direction of the hearth. The invention can greatly reduce NOx exhaust and fly ash combustible material content when used for the W flame boiler.

Description

technical field [0001] The invention relates to a method for staged combustion and a W flame boiler device, 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. The following problems generally exist in the operation of this W flame boiler: NO x The emission is as high as 1600~1800mg / m 3 , High content of combustibles in fly ash, 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. [0003] The common cross-sectional flow field of the W flame boiler mentioned above and the arrangement of the burner nozzle on the arch are as follows: image 3 , Figure 4 shown. Structurally analyze the above three problems, NO x The reason for the high emission is: 1. The dense pulverized coal airflow nozzle 10 and the secondary air nozzle 20 are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C5/08F23C7/00F23L9/00
CPCF23C5/08F23C2201/101F23C6/045F23L9/00F23C5/24F22B35/002F23C6/047F23C7/02F23D1/00
Inventor 李争起陈智超况敏孙锐朱群益曾令艳刘春龙孙绍增吴少华
Owner HARBIN INST OF TECH
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