Thermal insulation expansion joint of reducing adapter tube

Abstract

The invention discloses a thermal insulation expansion joint of a reducing adapter tube. The expansion joint is characterized by comprising a corrugated tube (2); both ends of the corrugated tube (2) are respectively connected with two reducing adapter tubes (1); the inner sides of the two reducing adapter tubes (1) are respectively attached and connected to the end part of two reducing lining tubes; and a thermal insulation layer is arranged in a thermal insulation cavity formed among the corrugated tube (2), the two reducing adapter tubes (1) and the two reducing lining tubes. The invention can fully meet the requirements of full-load and long-period safe operation of a process pipe of a petrochemical engineering device at high temperature and high flow rate; in normal operating state, the expansion joint has no abnormal deformation and the medium flows stably, and the surface temperature of the corrugated tube does not exceed the designed temperature during high-temperature operation for a long time; the reducing combinational lining meets the requirement of deformation coordination of the expansion joint, does not fall off and has no abnormal deformation during high-temperature operation for a long time; and the reducing adapter tube has no local deformation or crack during high-temperature operation for a long time.

Description

technical field [0001] The invention relates to a petrochemical plant process pipeline, in particular to an expansion joint. Background technique [0002] The process and design conditions of petrochemical plant process pipelines are relatively harsh, and the design temperature is high, reaching 600-750 °C. Due to the high temperature and flow rate of the medium, the bellows need to be effectively insulated and prevent material accumulation. All designs have special design requirements for variable diameters. Under normal circumstances, the method of segmental welding is used to achieve the purpose of reducing the diameter of the nozzle. This will cause structural discontinuity at high temperature and cause stress concentration, which will reduce the strength of the nozzle, and may cause local deformation or cracks, which will bring safety hazards. There is no expansion joint satisfying the above requirements in the prior art. Contents of the invention [0003] The purpo...

AI Technical Summary

Problems solved by technology

Under normal circumstances, the method of segmental welding is used to achieve the purpose of reducing the diameter of the connecting pipe. This will cause structural discontinuity at high temperatures, resulting in stress concentration, reducing the strength of the connecting pipe, and may cause local deformation or cracks, which will bring potential safety hazards.

There is no expansion joint meeting the above requirements in the prior art

Images