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Wall type arranged horizontal rich-lean direct current combustion device

A combustion device and horizontal technology, applied in the field of coal-fired boilers, can solve the problems of different gas supply conditions on both sides of the pulverized coal flow, slagging and high-temperature corrosion, etc., to reduce slagging and high-temperature corrosion of the water wall, and improve gas supply conditions , good effect

Active Publication Date: 2008-12-03
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 horizontal thick-lean direct-flow combustion device to solve the problem of tangential circle arrangement at four corners of the direct-flow burner. The air supply conditions on both sides of the pulverized coal flow are different, and deflection is prone to occur, causing slagging and high-temperature corrosion problems.

Method used

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  • Wall type arranged horizontal rich-lean direct current combustion device
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  • Wall type arranged horizontal rich-lean direct current combustion device

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specific Embodiment approach 1

[0009] Specific implementation mode one: combine Figure 1 to Figure 8 Describe this embodiment, present embodiment is made up of furnace hearth 5, multiple thick primary air spouts 1, multiple light primary air spouts 2, multiple secondary air spouts 3 and four groups of burn-off air spouts 4, and described furnace 5 is made up of Surrounded by four water-cooled walls 6, the four-sided water-cooled walls 6 of the furnace 5 are respectively provided with a plurality of concentrated primary air nozzles 1, a plurality of light primary air nozzles 2 and a plurality of secondary air nozzles 3, each of the water-cooled walls A plurality of thick primary air nozzles 1, a plurality of light primary air nozzles 2 and a plurality of secondary air nozzles 3 arranged on 6 form a group of burners 7, and the four groups of burners 7 are respectively arranged on the same horizontal plane. The secondary air nozzles 3 in each group of burners 7 are arranged alternately with the dense primary ...

specific Embodiment approach 2

[0012] Specific implementation mode two: combination figure 1 , Figure 4 and Figure 8 Describe this embodiment, the distance between the center line 31 of the secondary air spout 3 on each water wall 6 and the intersection point on the water wall 6 where it is located in this embodiment is L from the corner of the nearest furnace 5 1 , 1 / 5Lk≤L 1 ≤1 / 2Lk; or 1 / 5Ls≤L 1 ≤1 / 2Ls, the Lk is the furnace width, and the Ls is the furnace depth. The included angle between the center line 31 of the secondary air nozzle 3 in this embodiment and the water wall 6 where it is located is 54°≤α in the direction toward the fire side 1 ≤127°, the angle between the center line 21 of the light primary air nozzle 2 and the water wall 6 on the fire side is 54°≤α 2 ≤127°, the angle between the centerline 11 of the thick primary air nozzle 1 and the centerline 21 of the light primary air nozzle 2 is 0°≤α 3 ≤15°, the thick primary air jet is arranged on the fire side, the light primary air jet i...

specific Embodiment approach 3

[0013] Specific implementation mode three: combination Figure 5 Describe this embodiment, the overburning air spout 4 of this embodiment is arranged on each corner of the furnace 5, and the angle between the center line 41 of the overburning air spout 4 and the water wall 6 on the adjacent side is 20°≤ alpha 4 ≤70°. With such a setting, the arrangement of the overfired air is easy to realize, and the furnace fullness of the combustion airflow is better. Other components and connections are the same as those in the second embodiment.

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Abstract

A wall-mount horizontal bias direct-flow combustion device relates to a horizontal bias direct-flow combustion device. The invention solves the problems of the prior direct-flow combustor, such as four-corner tangential arrangement, different air supply conditions of coal flows on two sides, high risk of slag deposition due to declination and corrosion at high temperature. First dense / dilute air jet ports and a second air jet port (3) are formed on the water-cooled wall (6) of a furnace cavity (5) and combined to form a group of combustors (7). The central line (31) of the second air jet port and the central line (21) of the first dilute air jet port (2) are positioned in the fire-facing side direction, and have the included angles of alpha 1 and alpha 2 with relative to the water-cooled wall (6), on which the jet ports are positioned. The included angle between the central line (11) of the first dense air jet port and the central line (21) of the first dilute air jet port (2) is alpha 3. After-burn air jet ports (4) are arranged on the water-cooled wall (6) or at each corner of the furnace cavity (5). The After-burn air jet ports (4) are positioned above the combustors (7). The wall-mount horizontal bias direct-flow combustion device realizes reasonable combination of coal particles and air, prevents the deflection of coal flow, and ensures stable combustion, low load and low NOx discharge of boilers.

Description

technical field [0001] The invention relates to a horizontal thick-thin direct-flow combustion device, in particular to the technical field of coal-fired boilers. Background technique [0002] The four-corner tangential arrangement of the direct-flow burner and the front wall or opposite arrangement of the swirl burner are one of the two most widely used pulverized coal combustion methods in the world. The combustion method arranged in a tangential circle at four corners is to inject pulverized coal (primary air) and secondary air into the furnace at the four corners of the furnace and an imaginary tangent circle in the center of the furnace to realize tangential combustion of pulverized coal. The four-corner flames formed by the four-corner tangential direct current combustion technology can support each other, and the flue gas generated by the combustion rotates and rises in the furnace. It has the characteristics of long flame stroke, good mixing in the furnace, high comb...

Claims

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Application Information

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IPC IPC(8): F23C5/08F23C7/00
CPCF23C5/10F23C5/32F23C7/02
Inventor 吴少华孙绍增刘辉秦明秦裕琨
Owner HARBIN INST OF TECH
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