High-temperature superheater access port container repair method

Abstract

The invention discloses a high-temperature superheater access port container repair method, and belongs to the field of thermal power generation. The method comprises the following steps: (1) a fourth branch pipe is cut off from the root part of a container to the straight part of the branch pipe; (2) a welding base hole is formed in the container; (3) a connecting pipe is replaced; (4) the connecting pipe is welded between the container and the remainder part of the branch pipe; and (5) the online heat treatment is performed for the welded part. The online heat treatment in the step (5) adopts an electric heating element to wrap a welding line and the container and the branch pipe near the welding line, and adopts a temperature controller to perform the temperature and time control for the heating temperature; the electric heating element is a heating rope; and the heating rope includes an electric heating wire and an asbestos rope. The method can overcome the cracking defect of the welding line easily caused by stress generation due to insufficient curvature of the fourth branch pipe of a high-temperature superheater access port container, and guarantees the characteristic of normal working of the container.

Description

technical field [0001] The invention belongs to the field of thermal power generation equipment, and in particular relates to a method for repairing an inlet and outlet header of a high-temperature superheater of a steam boiler in a thermal power plant. Background technique [0002] In thermal power generation enterprises, relying on the combustion of fuel in the steam boiler, the water is heated into high-temperature and high-pressure steam, which drives the steam turbine to rotate and drives the generator to generate electricity; in the application of steam, in order to ensure that the steam will not be generated excessively If there is a lot of water, the high temperature state of the steam is often maintained, enters the header, and then distributes to each branch pipeline to facilitate the rational application of steam; in the existing high-temperature superheater inlet and outlet headers, most of them use headers There are many small tubes distributed around, the steam...

AI Technical Summary

Problems solved by technology

[0002] In thermal power generation enterprises, relying on the combustion of fuel in the steam boiler, the water is heated into high-temperature and high-pressure steam, which drives the steam turbine to rotate and drives the generator to generate electricity; in the application of steam, in order to ensure that the steam will not be generated excessively If there is a lot of water, the high temperature state of the steam is often maintained, enters the header, and then distributes to each branch pipeline to facilitate the rational application of steam; in the existing high-temperature superheater inlet and outlet headers, most of them use headers There are many small tubes distributed around, the steam pressure of the superheater is 13.7MPa, and the temperature is 540°C. The material of the high-temperature superheater header is 12Cr1MoV, and the common specifications are 325 mm in diameter and 50 mm in wall thickness. The material of the branch pipe is 12Cr1MoV, and the specification is The diameter is 42 mm, and the wall thickness is 5.5 mm. After working practice, it is found that there are often cracks at the root of the fourth pipe seat from the single row of the outlet header pipe seat of the high-temperature superheater. After repeated repairs, this branch pipe has become a high-temperature superheater. The outlet header is easy to damage the concentration point

Images