Fluidized bed combustion device with wall surface-center combined supplying secondary air

A technology of combustion device and secondary air, which is applied to fluidized bed combustion equipment, fuel burning in a molten state, combustion method, etc., can solve the problem of poor operation stability of combustion device, affecting boiler combustion efficiency, and weak secondary air penetration ability. and other problems, to achieve the effect of solving the lack of secondary air penetration, promoting full mixing and reaction, and reducing uneven distribution

Inactive Publication Date: 2008-06-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problem of unsatisfactory air supply effect in the central area of ​​the boiler in the secondary air supply of the existing fluidized bed combustion device, weak secondary air penetration ability, material reversion into the secondary air delivery pipe, and stable operation of the combustion device. Poor performance, which affects the combustion efficiency of the boiler, and then provides a fluidized bed combustion device for the wall-center compound supply of secondary air

Method used

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  • Fluidized bed combustion device with wall surface-center combined supplying secondary air
  • Fluidized bed combustion device with wall surface-center combined supplying secondary air
  • Fluidized bed combustion device with wall surface-center combined supplying secondary air

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specific Embodiment approach 1

[0007] Embodiment 1: As shown in Figures 1 to 3, the wall-center fluidized bed combustion device for secondary air composite supply in this embodiment consists of a fluidized bed combustion chamber 3, an air distribution plate 1, and several downward-inclining two The secondary air duct 5 is composed of a counterflow secondary air column 4 and a secondary air box 6. The several downward-inclining secondary air ducts 5 are installed on the wall 2 of the fluidized bed combustion chamber 3, and the air distribution plate 1 Horizontally arranged at the bottom of the fluidized bed combustion chamber 3, the counterflow secondary air column 4 is arranged in the central area of ​​the fluidized bed combustion chamber 3, and the countercurrent secondary air column 4 is mainly transported by the secondary air The pipe 8 and the counter-flow type column head 9 are composed of a secondary air nozzle 11 on the side wall of the counter-flow type column head 9. It is fixedly connected with th...

specific Embodiment approach 2

[0008] Embodiment 2: As shown in FIG. 2 , there is a gap between the upper end surface 8 - 1 of the secondary air conveying pipe 8 in this embodiment and the upper inner wall surface 9 - 1 of the counterflow column head 9 . The secondary air from the secondary air box 6 flows out through the upper end of the secondary air conveying pipe 8 into the guide air duct 10 , and then is ejected from the secondary air nozzle 11 . Other components and connections are the same as those in the first embodiment. Since the present invention (column-type countercurrent type secondary air column) is located in the high-temperature and high-concentration area of ​​the dense phase area at the bottom of the fluidized bed, if no refractory and wear-resistant materials are laid, both the secondary air delivery pipe 8 and the counterflow type column head 9 need to adopt heat-resistant Made of wear-resistant material.

specific Embodiment approach 3

[0009] Specific embodiment three: As shown in Figure 3, the upper end surface 8-1 of the secondary air conveying pipe 8 described in this embodiment is airtightly connected with the upper end inner wall surface 9-1 of the counter-flow type column head 9, and the upper end surface 9-1 of the counter-flow type column head Several flow holes 13 are provided on the upper end sidewall of the secondary air conveying pipe 8 inside 9 . The secondary air from the secondary air box 6 passes through the secondary air conveying pipe 8 , flows out from a plurality of flow holes 13 , and then sprays out from the secondary air nozzle 11 . Other components and connections are the same as those in the first embodiment.

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Abstract

A fluidized bed burning device for compositely providing secondary air by wall surface-center is provided, which relates to a burning device. The invention solves the problems as bad air supply effect, weak penetrating capacity of secondary air and bad operating performance when the materials are reversed into the secondary air transferring pipe at center of boiler of the existing fluidized bed burning device. The plurality of down-inclined secondary air pipes (5) are positioned on a side wall (2) of a fluidized bed firebox (3); the reversed secondary air post (4) is arranged at the central area in the fluidized bed firebox (3); a reversed pos head (9) is provided with a secondary air spraying port (11) on side wall; upper end of a secondary air transferring pipe (8) passes through the lower end surface of the reversed post head (9), which is mounted in the reversed post head (9) and is fixed and connected with the reversed post head (9). The invention supplies the air needed for burning at the central area of the boiler furnace and promotes the sufficient mixing and reaction of solid-gas two-phase in the furnace and realizes higher burning efficiency.

Description

technical field [0001] The invention relates to a combustion device, in particular to a fluidized bed combustion device with secondary air compound supply. Background technique [0002] With the continuous development of fluidized bed technology, especially circulating fluidized bed technology, the issue of range and diffusion of secondary air in fluidized bed boilers has always been paid attention to because it directly affects the combustion efficiency of the boiler. At present, the most common problem of the secondary air in the circulating fluidized bed is that the penetration of the secondary air in the furnace is insufficient, the secondary air cannot reach the center of the furnace, and the strong gas-solid two-phase interaction in the center of the furnace requires more Therefore, the insufficient penetration of the secondary air causes the radial distribution of oxygen in the furnace to be very uneven, and the oxygen concentration in the central area of ​​the furnac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/00F23L9/06
Inventor 孙绍增王正阳秦明秦裕琨吴少华赵广播邓启刚
Owner HARBIN INST OF TECH
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