A central tube fixing structure for circulating fluidized bed boiler

Abstract

The invention provides a center cylinder fixed structure for a circulating fluidized bed boiler, which has the advantages that the structure is very simple, the expansion is free, abrasion to a center cylinder by dust-containing smoke is avoided, and a potential safety hazard is eliminated. The center cylinder fixed structure comprises the center cylinder and a protecting plate base, and the center cylinder fixed structure is characterized in that the upper part of the center cylinder is provided with a two-layer annulus plate structure; the annulus plate specifically comprises an upper annulus plate and a lower annulus plate, wherein the excircle surface of the center cylinder arranged between the upper annulus plate and the lower annulus plate is uniformly provided with strengthening vertical ribs; and the upper ends and the lower ends of the strengthening vertical ribs are respectively connected with the lower end surface of the upper annulus plate and the upper end surface of the lower annulus plate in a welding manner, a main body of a middle lower part of the center cylinder penetrates through a center installing hole of the protecting plate base, and the lower end surface of the lower annulus plate clings to the upper end surface of a base annulus plate of the protecting plate base.

Description

technical field [0001] The invention relates to the technical field of boiler structures, in particular to a support structure for preventing the central cylinder of a circulating fluidized bed boiler from falling off. Background technique [0002] At present, the central cylinder of circulating fluidized bed boilers adopts two structural forms: tie rod bolts or hanging structure, see figure 1 with figure 2 . figure 1 The tie rod bolt fixing device in the boiler is in a high temperature state during the operation of the boiler, and the bolts are under shear stress for a long time, which is prone to breakage, resulting in an accident that the center tube falls off; figure 2 The same problem exists in the fixed central tube of the hanging structure. The high temperature makes the material strength of the hanging metal parts soft, and the insufficient reinforcement at the upper edge of the central tube makes it deform and shrink inward under high temperature, thus pulling t...

AI Technical Summary

Problems solved by technology

figure 1 The tie rod bolt fixing device in the boiler is in a high temperature state during the operation of the boiler, and the bolts are under shear stress for a long time, which is prone to breakage, resulting in an accident that the center tube falls off; figure 2 The same problem exists in the fixed central tube of the hanging structure. The high temperature makes the material strength of the hanging metal parts soft, and the insufficient reinforcement at the upper edge of the central tube makes it deform and shrink inward under high temperature, thus pulling the hanging hook. , so the hook shown in the figure is prone to twisting, deformation and failure, causing the center tube to fall off

In addition, under high temperature conditions, the expansion characteristics of metal materials make a circle of gaps appear soon at the "gap formation" shown in the figure, and part of the dust-laden smoke will flow through this channel. Long-term scouring will cause refractory materials and the center tube Wall wear and tear, creating a safety hazard

The above problems all occur in the actual operation of the boiler, and the occurrence rate is very high, which is not conducive to the long-term safe and stable operation of the boiler.

In addition, it is very troublesome to replace the central cylinder fixed by these two forms as a whole. It is necessary to dismantle a large number of surrounding furnace walls. The disassembly and assembly cycle is very long, which is not conducive to the rapid maintenance of the boiler

Images