Anti-disengaging detachable material returning air cap for circulating fluidized bed boiler

Abstract

The invention provides an anti-disengaging detachable material returning air cap for a circulating fluidized bed boiler. The situations of loosening and disengaging of an air cap head caused by the impact of high-pressure head fluidized air are avoided, the air cap head can be conveniently loosened and tightened after being firmly clamped through a wrench, and circulating materials of the whole boiler can normally return. The anti-disengaging detachable material returning air cap comprises the air cap head and an air cap connecting pipe, wherein the lower end of the air cap head is in threaded connection with an upper joint of the air cap connecting pipe, and is arranged on the upper joint of the air cap connecting pipe in a sleeving manner; an air outlet is formed in the middle annular surface of the air cap head; a central hole of the air cap connecting pipe is communicated with a cavity formed by combining the air cap head and the air cap connecting pipe; the cavity is communicated with the air outlet. The anti-disengaging detachable material returning air cap is characterized in that an outer boss structure is arranged in the middle of the air cap connecting pipe; the upper end surface of the outer boss structure is of a planar structure; a spring washer is pressed between the bottom end surface of the air cap head and the upper end surface of the outer boss structure; two sides of an outer ring surface, corresponding to a threaded part, of the air cap head are machined to form the planar structures.

Description

technical field [0001] The invention relates to the technical field of boiler structures, in particular to an anti-falling and easy-to-detach return air cap for circulating fluidized bed boilers. Background technique [0002] Circulating fluidized bed boiler combustion technology is a coal-fired technology developed in the past 20 years. It has outstanding advantages such as wide fuel adaptability, high combustion efficiency, low nitrogen oxide emissions, large load regulation ratio and fast load regulation. The return device is a particularly important return device in the material circulation of the circulating fluidized bed boiler. The air cap inside it is the main component that affects whether the entire boiler circulation material can be returned normally. At present, most of the air caps used in the return device are threaded. form, such as figure 1 The illustrated structural form. The temperature of the material in the return device is generally between 850 and...

AI Technical Summary

Problems solved by technology

figure 1 The threaded connection is adopted to facilitate the disassembly of the hood head structurally, but the return air of the high-pressure head inside the hood is very easy to loose the thread during operation, causing the hood head to fall off and affecting the normal operation of the return device. In addition, the cylindrical structure of the hood head Impossibility of tightening threads with suitable tools

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