Combined inserting protective sleeve of waste heat boiler

Abstract

The invention discloses a combined inserting protective sleeve of a waste heat boiler, and solves the problem of the current protective sleeve that the actual forming quality is poor and the dimensional tolerance is difficult to control because the section size of a cone section is too small so that this position easily generates the fit clearance of gas carry-over. The technical scheme comprises an outer protective pipe and an inner protective pipe sleeved in the outer protective pipe; the outer pipe wall of the inlet end of the inner protective pipe and the inner pipe wall of the inlet end of the outer protective pipe are the conical surface fit; and the rear sections of the conical surfaces of the inner protective pipe and the outer protective pipe are provided with steps correspondingly. The combined inserting protective sleeve of the waste heat boiler has the characters of simple structure, convenient maintenance, low size fit requirement of the inner and outer pipes, difficult gas carrying-over, and good sealing performance.

Description

technical field [0001] The invention relates to a protective casing for a boiler, in particular to a combined waste heat boiler insertion protective casing. Background technique [0002] There are basically two existing structures for the protection of the high-temperature flue gas inlet tube plate of the waste heat boiler and the head of the heat exchange tube, 1) castable + protective sleeve (ceramic or metal), 2) combined ceramic sleeve + backup lining Ceramic fiber. [0003] Among them, prior art 1) Fix the protective sleeve (ceramic or metal) with castable, control the pitch between the sleeves, and fix it on the tube plate. The disadvantage is that when the castable cracks or falls off, the protective sleeve cracks or breaks, the heat exchange tube head cracks, the metal surface of the tube plate is pulverized, the heat exchange tube leaks, etc., it is difficult to repair on site, and the repair time is relatively large. Long, the cost of rework is high, which has a ...

AI Technical Summary

Problems solved by technology

The disadvantage is that when the castable cracks or falls off, the protective sleeve cracks or breaks, the heat exchange tube head cracks, the metal surface of the tube plate is pulverized, the heat exchange tube leaks, etc., it is difficult to repair on site, and the repair time is relatively large. Long time, high cost of rework, great impact on the long-term operation of the entire device, seriously affecting the economic benefits of device operation

[0004] Existing technology 2) The outer wall and the inner wall corresponding to the inlet end of the inner and outer sleeves are directly fitted with a tapered surface. The disadvantage is that the actual molding quality is poor and the dimensional tolerance is difficult to control due to the small cross-sectional size of the tapered section of the inner and outer sleeves. , resulting in a fitting gap that is prone to blow-by

Images