Slagging-resistance and high temperature resistance coal powder burning device used in vertical strong/weak combustion boiler

A technology of thick-thin combustion and pulverized coal combustion, which is applied in the direction of burning powder fuel burners, combustion air/fuel supply, burners, etc., can solve problems such as slagging and high-temperature corrosion, reduce high-temperature corrosion, and improve air supply conditions, the effect of improving rigidity

Inactive Publication Date: 2007-08-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of slagging and high-temperature corrosion on the water wall of pulverized coal boilers, especially the problems of slagging and high-temperature corrosion on the water wall of boilers using vertical thick-lean combustion technology, the present invention designs an anti-slagging and anti-corrosion Pulverized coal combustion device with high temperature corrosion

Method used

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  • Slagging-resistance and high temperature resistance coal powder burning device used in vertical strong/weak combustion boiler
  • Slagging-resistance and high temperature resistance coal powder burning device used in vertical strong/weak combustion boiler
  • Slagging-resistance and high temperature resistance coal powder burning device used in vertical strong/weak combustion boiler

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specific Embodiment approach 1

[0009] Specific Embodiment 1: Refer to FIG. 1 to illustrate this embodiment. The pulverized coal combustion device for anti-slagging and high-temperature corrosion prevention of vertical thick-lean combustion boilers in this embodiment includes a secondary air nozzle 6, a concentrated primary air nozzle 3 and a light primary air nozzle 4, the secondary air nozzle 6, The thick primary air spout 3 and the light primary air spout 4 are vertically arranged, and also includes the thick side secondary air spout 5, and the thick side secondary air spout 5 is fixedly installed on the back fire side of the thick primary air spout 3, and the thick side secondary air spout 5 The distance between the air nozzle 5 and the concentrated primary air nozzle 3 is d1, and the d1 is 0-0.2 times of the nozzle width d3 of the concentrated primary air nozzle.

[0010] In this embodiment, the dense side secondary air nozzle 5 is set at the distance d1 of the back fire side of the rich primary nozzle ...

specific Embodiment approach 2

[0011] Specific Embodiment 2: Refer to FIG. 2 to illustrate this embodiment. The difference between this embodiment and the pulverized coal combustion device for preventing slagging and high-temperature corrosion of vertical rich-lean combustion boilers described in Embodiment 1 is that the backfire side of the concentrated primary air nozzle 3 is a tapered nozzle, and the tapered The angle is α1, and the α1 is between 0 and 15 degrees; the fire side of the secondary air nozzle 5 on the concentrated side is a tapering nozzle, and the tapering angle is α2, and the α2 is between 0 and 15 degrees. By setting the concentrated primary air nozzle and the concentrated side secondary air nozzle as tapered nozzles, it is equivalent to setting a blunt body between the concentrated primary air nozzle and the concentrated side secondary air nozzle to reduce the initial stage of the concentrated primary air jet and the side secondary air. Mixed works better.

specific Embodiment approach 3

[0012] Specific Embodiment Three: Refer to FIG. 3 and FIG. 4 to illustrate this embodiment. The difference between this embodiment and the pulverized coal combustion device for preventing slagging and high-temperature corrosion of vertical rich-lean combustion boilers described in Embodiment 1 is that the axis 31 of the nozzle of the concentrated primary air and the axis 51 of the nozzle of the concentrated side secondary air The included angle is β1, and the β1 is between 0° and 15°.

[0013] Compared with Embodiment 1, the axis 51 of the secondary air flow on the concentrated side and the axis 31 of the primary air flow on the concentrated side form an angle β1 in this embodiment, so that on the one hand, it can reduce the impact of the secondary air flow on the concentrated side on the primary air flow. The effect is to reduce the mixing of the initial stage of the concentrated primary air jet and the side secondary air, and at the same time reduce the deflection of the con...

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Abstract

A coal powder burner can avoid scale and high-temperature corrosion in vertical gradient burning boiler, wherein a back side d1 of dense first injector is fixed with a dense secondary injector, the dense first airflow and the axis of the dense second airflow have a corner at beta 1, a dilute second airflow can be arranged at the back of the dilute first injector. The two airflows can improve the injection rigidity to confirm the oxidization condition near the water cooling wall and reduce the temperature near the water cooling wall, to avoid scale and high-temperature corrosion. The invention can arrange space or baffle between the dense first injector and the dense secondary injector, to reduce the mixing between the dense first airflow and the dense secondary airflow.

Description

technical field [0001] The invention relates to a pulverized coal boiler combustion device. Background technique [0002] At present, water wall slagging and high temperature corrosion are common in large pulverized coal power plant boilers, especially in boilers using vertical thick-lean combustion technology. These slagging and high-temperature corrosion problems not only damage the boiler and affect production, but also threaten the personal safety of production operators. [0003] The vertical thick-thin combustion technology is to classify the primary air in the height direction to form a thick primary air and a light primary air. When the thick primary air burns, the heat of ignition is reduced, the heat release is concentrated, the burning speed is fast, and the blackness of the ignition area is large. , is conducive to radiation heat transfer, high combustion intensity, and fast flame propagation speed. These factors are conducive to the ignition and combustion of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D1/00F23C7/00F23L9/00F23L1/00
Inventor 刘辉吴少华孙绍增邱朋华孙锐秦明李争起秦裕琨
Owner HARBIN INST OF TECH
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