A device and method for detecting the welding quality of a single boiler convection tube

Abstract

The invention provides a device for detecting welding quality of a single boiler convective tube. The method for detecting welding quality of the single boiler convective tube comprises a jack and further comprises a pressure fluid transfer device, a supporting steel tube and an arc steel plate. One end of the pressure fluid transfer device is provided with a concave chamber, the end surface of the outer edge of the concave chamber at the end is identical to the inner cavity wall of a steam pocket in curvature and can be bonded to the inner cavity wall, and the end surface is provided with a groove mounted with a seal ring; a conveying channel penetrates the pressure fluid transfer device, one end of the conveying channel is disposed on a tube end opening of a convection tube to be detected, and the other end is connected with a nozzle; a positioning ring is arranged below the tube end opening on the tube. The invention also provides a method for detecting welding quality of the single boiler convective tube. The device for detecting welding quality of the single boiler convective tube has the advantages of being easy to machine, safe and reliable to use and easy to assemble and disassemble and the like. The device for detecting welding quality of the single boiler convective tube can be used without replacing parts and widely applied to a hydrostatic test of the single welded boiler convective tube of different sizes in a boiler equipment installation process.

Description

technical field [0001] The invention relates to the field of energy conversion equipment, in particular to a device and method for detecting the welding quality of a single boiler convection tube. Background technique [0002] In the on-site installation of the boiler, it is necessary to connect the two steam drums with a pipe composed of multiple steel pipes (convection pipes). welded to form a sealed connection, and the welding is carried out at the weld (15) (see figure 1 ). [0003] During the boiler manufacturing and installation process, it is necessary to solve the problem of timely confirmation of the boiler convection tube welding quality. For example, the convection pipes of a project are made of φ51×3.5 No. 20 seamless steel pipes, 36 rows are arranged longitudinally along the drum, and 16 rows are arranged horizontally. Due to the tight vertical and horizontal arrangement of the pipes, each welding joint has a visual blind spot of about 15mm, and the welding q...

AI Technical Summary

Problems solved by technology

Due to the tight vertical and horizontal arrangement of the pipes, each welding joint has a visual blind spot of about 15mm, and the welding quality is difficult to guarantee. At the same time, due to the shortcomings of the existing non-destructive testing technology, it is inconvenient to carry out timely testing, and there are problems that the testing results may be distorted; When using ray non-destructive testing, construction personnel need to evacuate from the site, and the testing results lag behind, which greatly prolongs the construction period and reduces construction efficiency, and the testing cost is relatively high

If the welding quality is not confirmed in time, welding quality problems will appear during the boiler hydraulic pressure test, especially in the welding seams located in the middle position, then the outer rows of welded convection tubes must be cut off to correct quality problems The welding seams are repaired, which makes it more difficult to guarantee the quality of the second welding in the future

[0004] After searching, the Chinese patent application publication CN202580378U discloses a kind of "inner expansion sealing connection device for pipeline pressure test", but it is generally used for pipelines with an inner diameter smaller than DN50, and each inner diameter must correspond to the detection of a specification At the same time, the device has many easily damaged accessories, which need to be replaced during use

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