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Wall-arranged direct-flow pulverized coal combustion device with side secondary air

A technology of pulverized coal combustion and secondary air, which is applied in the field of coal-fired boilers, can solve the problems of difficulty in the four-corner tangential arrangement of once-through burners, different gas supply conditions, high-temperature corrosion, etc., to facilitate the ignition of pulverized coal and facilitate graded combustion , Reduce the effect of slagging and high temperature corrosion

Inactive Publication Date: 2010-10-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a wall-type arrangement of a DC pulverized coal combustion device with side secondary air to solve the difficulty in arranging the four corners of the DC burner with side secondary air in tangential circles, which cannot completely solve the problem of air supply on both sides of the pulverized coal flow. The deflection of pulverized coal airflow caused by different conditions causes slagging and high temperature corrosion problems

Method used

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  • Wall-arranged direct-flow pulverized coal combustion device with side secondary air
  • Wall-arranged direct-flow pulverized coal combustion device with side secondary air
  • Wall-arranged direct-flow pulverized coal combustion device with side secondary air

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specific Embodiment approach 1

[0009] Specific implementation mode one: combine Figure 1 ~ Figure 3 and Figure 7 ~ Figure 11 Describe this embodiment, the combustion device of this embodiment comprises furnace 5, a plurality of primary air nozzles 1, a plurality of side secondary air nozzles 2, a plurality of secondary air nozzles 3 and four groups of burn-off air nozzles 10, and furnace 5 is composed of Surrounded by four water-cooled walls 6, each water-cooled wall 6 is respectively provided with a plurality of primary air nozzles 1 and a plurality of secondary air nozzles 3, and each group of over-burning air nozzles 10 includes at least one over-burning air nozzle 4; each water-cooled A plurality of side secondary air nozzles 2 are also arranged on the wall 6; a plurality of primary air nozzles 1, a plurality of side secondary air nozzles 2 and a plurality of secondary air nozzles 3 arranged on each water-cooled wall 6 form a group Burners 7, four groups of burners 7 are all arranged on the same leve...

specific Embodiment approach 2

[0013] Specific embodiment two: the distance L between the center line 31 of the secondary air nozzle 3 arranged on each water-cooled wall 6 of this embodiment and the intersection point on the water-cooled wall 6 where it is located, and the corner of the nearest furnace 5 1 = 1 / 4 furnace width Lk or furnace depth Ls; the angle between the center line 31 of the secondary air nozzle 3 in the fire side direction and the water wall 6 where it is located is α 1 =90° (that is, the centerline 31 of each secondary air nozzle 3 is perpendicular to the water-cooled wall where it is located); the angle α between the centerline 11 of the primary air nozzle 1 in the fire side direction and the water-cooled wall 6 where it is located 2 =90° (that is, the centerline 11 of each primary air nozzle 1 is perpendicular to the water wall where it is located); between the centerline 21 of the side secondary air nozzle 2 and the centerline 11 of the adjacent primary air nozzle 1 The included angle...

specific Embodiment approach 3

[0014] Specific embodiment three: the distance L between the center line 31 of the secondary air nozzle 3 arranged on each water-cooled wall 6 of this embodiment and the intersection point on the water-cooled wall 6 where it is located, and the corner of the nearest furnace 5 1 =1 / 2 furnace width Lk or furnace depth Ls. It is set in such a way that the secondary air nozzle 3 is arranged on the center line of the water cooling wall 6 . The heat load near the water wall 6 is the largest, which is beneficial to the stable combustion of pulverized coal, and is suitable for difficult-to-combustible coals. Under the same conditions, the minimum stable combustion load of this embodiment is 10% lower than the minimum stable combustion load of the burner angular arrangement. 20%. Other components and connections are the same as those in the first embodiment.

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Abstract

The invention discloses a wall-arranged direct-flow pulverized coal combustion device with side secondary air, relates to a direct-flow pulverized coal combustion device and aims to solve the problem that the four corners of a direct-flow combustor with side secondary air are difficult to arrange tangentially and the problems of flag formation and high temperature corrosion caused by the deflection of pulverized coal airflow due to different air replenishing conditions on both sides of pulverized coal airflow. Primary and secondary air nozzles arranged on four water-cooled walls of a hearth are combined with a side secondary air nozzle to form a combustor; an included angle between the central line of the primary air nozzle and the water-cooled wall on which the primary air nozzle is positioned in a fire side facing direction is alpha 2; an included angle between the central line of the secondary air nozzle and the water-cooled wall on which the secondary air nozzle is positioned in the fire side facing direction is alpha 1; an included angle between the central line of the side secondary air nozzle and the primary air nozzle is alpha 3; and over fire air nozzles are arranged on the water-cooled walls or corners of the hearth and arranged above the combustor. The mixing of pulverized coal and the air is reasonably organized to realize air-covered pulverized coal combustion, prevent the pulverized coal airflow from being deflected and contribute to stable combustion, low load and low NOx emission of a boiler. The device is used on a coal-fired boiler.

Description

technical field [0001] The invention relates to a direct-flow pulverized coal combustion device, in particular to the technical field of coal-fired boilers. Background technique [0002] The tangential circle arrangement of the four corners of the direct-flow burner is one of the most widely used pulverized coal combustion methods. In this combustion method, the burners are arranged at the four corners of the furnace, and the pulverized coal airflow (primary air) and the secondary air jet form an imaginary tangential circle in the center of the furnace. , to achieve tangential combustion of pulverized coal. The four-corner flames formed by the four-corner tangential direct-flow combustion technology can support each other, the ignition conditions are good, the coal type is highly adaptable, the mixing process of the primary and secondary air is easy to control, and the later mixing is strong, which is convenient for air staging and fuel staging combustion, and is conducive t...

Claims

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Application Information

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IPC IPC(8): F23C5/08F23C7/00
Inventor 刘辉秦明孔超沙龙吴少华孙绍增秦裕琨
Owner HARBIN INST OF TECH
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