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

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...

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

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