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

A thick-lean combustion and pulverized coal combustion technology, which is applied to the burner of burning powder fuel, the supply of combustion air/fuel, the burner, etc., can solve the problems of slagging and high-temperature corrosion, reduce high-temperature corrosion, prevent premature The effect of deflection and reducing slagging in the furnace

Inactive Publication Date: 2009-05-27
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 corrosion resistance coal powder burning device used in vertical strong/weak combustion boiler
  • Slagging-resistance and high temperature corrosion resistance coal powder burning device used in vertical strong/weak combustion boiler
  • Slagging-resistance and high temperature corrosion resistance coal powder burning device used in vertical strong/weak combustion boiler

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specific Embodiment approach 1

[0009] Specific implementation manner one: see figure 1 This embodiment will be described. The pulverized coal combustion device for preventing slagging and high temperature corrosion of a vertical thick and thin burning boiler of this embodiment includes a secondary air nozzle 6, a thick primary air nozzle 3, and a weak primary air nozzle 4. The secondary air nozzle 6, The dense primary air nozzles 3 and the weak primary air nozzles 4 are arranged vertically, and also include a concentrated side secondary air nozzle 5, which is fixedly installed on the back fire side of the concentrated primary air nozzle 3, and the concentrated side secondary air nozzle 5 is fixedly installed on the back fire side of the concentrated primary air nozzle 3. The distance between the air nozzle 5 and the concentrated primary air nozzle 3 is d1, and the d1 is 0 to 0.2 times the nozzle width d3 of the concentrated primary air nozzle.

[0010] In this embodiment, a thick-side secondary air nozzle 5 is...

specific Embodiment approach 2

[0011] Specific implementation manner two: see figure 2 This embodiment will be described. The difference between this embodiment and the pulverized coal combustion device for preventing slagging and high temperature corrosion of a vertical dense-lean combustion boiler described in the first embodiment is that the backfire side of the dense primary air nozzle 3 is a tapered nozzle. The angle is α1, and the α1 is between 0 and 15 degrees; the fire-facing side of the rich-side secondary air nozzle 5 is a tapered nozzle, and the tapering angle is α2, and the α2 is between 0 and 15 degrees. By setting the thick primary air nozzle and the thick side secondary air nozzle as a tapered nozzle, it is equivalent to setting a bluff body between the thick primary air nozzle and the thick side secondary air nozzle, reducing the initial stage of the thick primary air jet and the side secondary air The effect of mixing is better.

specific Embodiment approach 3

[0012] Specific implementation manner three: see image 3 with Figure 4 This embodiment will be described. The difference between this embodiment and the pulverized coal combustion device for preventing slagging and high temperature corrosion of a vertical rich-lean burning boiler described in the first embodiment is that the concentrated primary air nozzle axis 31 and the rich side secondary air nozzle axis 51 are different The included angle is β1, and the β1 is between 0 and 15 degrees.

[0013] Compared with the first embodiment, the axis 51 of the concentrated secondary air flow and the axis 31 of the concentrated primary air flow form an angle β1, which can reduce the impact of the concentrated secondary air flow on the concentrated primary air flow. The effect is to reduce the mixing of the concentrated primary air jet and the side secondary air at the beginning, and at the same time reduce the slanting of the concentrated primary air flow under the impact of the adjacent ...

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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-scale pulverized coal power station boilers. In particular, the slagging and high temperature corrosion of water wall of boilers using vertical dense-lean combustion technology are more serious. 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 and thin combustion technology is to classify the primary wind in the height direction to form a thick primary wind and a light primary wind. When the thick primary wind burns, the ignition heat is reduced, the heat release is concentrated, the burning speed is fast, and the ignition area is darker. , It is conducive to radiant heat exchange, the combustion intensity is high, and the flame sprea...

Claims

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Application Information

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Patent Type & Authority Patents(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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