Detachable header device applied to coiled pipe high-pressure heaters

Abstract

The invention discloses a detachable header device applied to coiled pipe high-pressure heaters. The detachable header device comprises a cylindrical header, an end self-sealing manhole cover and a plurality of fixing parts, wherein the end self-sealing manhole cover is provided with a protrusion; the protrusion is inserted into an opening in the cylindrical header; each fixing part penetrates through the end self-sealing manhole cover and is inserted into the side wall at the opening position of the cylindrical header; and a sealing part is arranged between the side wall of the protrusion and the inner wall of the cylindrical header. Through the device, various problems caused by butt welding seams can be avoided; meanwhile, leakage is prevented.

Description

technical field [0001] The invention belongs to the field of tubular heat exchangers, and relates to a detachable header device for a serpentine tube high-pressure heater. Background technique [0002] As the design parameters of the 1000MW double reheating unit are getting higher and higher, the use of double-row U-shaped tube high-pressure heaters is becoming more and more restricted. Because the serpentine tube high-pressure heater has simple structure and system, good thermal adaptability, and reliability High performance and other advantages lead to its application more and more widely. [0003] The structure of the existing serpentine tube high-pressure heater is composed of a shell, a pair of cylindrical headers, a serpentine heat exchange tube, a cladding plate and a head. A pair of cylindrical headers are welded to the manhole cover at the end to form a seal. The cavity together constitutes the water inlet chamber and the water outlet chamber. The water inlet chamb...

AI Technical Summary

Problems solved by technology

[0004] Due to the existence of butt welds after the welding of the cylindrical header and the end manhole cover, the welds are likely to cause stress concentration, welding defects, difficult flaw detection operations, increased production processes, and excessive hardness during the welding process. There is a fracture, which is likely to cause major safety hazards

[0005] At the same time, the connection between the cylindrical header and the serpentine heat exchange tube is prone to leaks such as tube explosion during long-term operation, and this structure greatly hinders the operability of maintenance

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