Sealing device for hand holes of circulating fluidized bed boiler header

Abstract

The invention relates to a sealing device for hand holes of a circulating fluidized bed boiler header. The sealing device comprises a header body, wherein the hand holes are formed in the two ends of the header body. The sealing device is characterized in that a pipe connector and an end cover are connected in sequence outside the hand holes; one end of the pipe connector is hermetically connected with the peripheries of the hand holes; the pipe connector is hermetically connected with the periphery of an opening part of the end cover. The sealing device is simple in structure, low in manufacturing cost, good in sealing reliability, unlikely to leak and suitable for sealing the hand holes in the circulating fluidized bed boiler header.

Description

technical field [0001] The invention relates to a mechanical sealing mechanism. Specifically, it is a sealing device used to seal the hand hole on the header of the circulating fluidized bed boiler. Background technique [0002] It is known in the field of boiler production and application that the evaporation system of circulating fluidized bed boilers is equipped with downcomer headers, water wall headers, superheater headers and economizer headers. These headers are processed with at least two hand holes for inspection and maintenance, and these hand holes are equipped with sealing devices when the header is in normal working condition. Such as figure 1 As shown, the traditional hand hole sealing device includes a T-shaped hole cover 3, a pressure plate 2 and a nut 1, the diameter of the horizontal part of the T-shaped hole cover 3 is greater than the aperture of the hand hole, and the T-shaped hole cover 3 The outer end of the vertical part is processed with external ...

AI Technical Summary

Problems solved by technology

Although the above-mentioned device can be used to seal the hand hole of the circulating fluidized bed boiler header, the requirements for the T-shaped hole cover 3 are very strict, requiring it to have sufficient strength, rigidity, toughness and heat resistance, and the sealing surface It should be smooth and clean, fastened reliably, etc., making the structure more complicated and the manufacturing cost higher

And because the structure is relatively complex, and the installation site conditions are usually relatively poor, the heat treatment temperature after welding is difficult to control, the welding quality is difficult to guarantee, and leakage is prone to occur. Once leakage occurs, the steam loss is large, thus affecting the normal operation of the boiler

In addition, since the hand hole inspection must be opened after boiler pickling, pipe flushing and operation for a certain period of time, the original weld seam must be scraped off every time it is opened, so repeated opening, seam scraping, welding, and heat treatment will inevitably Great influence on welding area and header body

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