Local heater used in molding of pipe orifice of main steam super pipe and method for heating master pipe blank by using same

Abstract

The invention relates to a local heater used in molding of a pipe orifice of a main steam super pipe and a method for heating a master pipe blank by using the same. The local heater comprises a combustion head and a fire damper disk, wherein the combustion head consists of an air inlet pipe, a combustible gas inlet pipe, a combustion chamber and the like; the contact surface of the combustion chamber and the master pipe blank of the main steam super pipe is a curved surface; the fire damper disk is provided with a contact type thermocouple, an automatic ignition device and a fire-resistant, heat-insulating and heat-preservation layer; and the contact type thermocouple is in contact with the master pipe blank of the main steam super pipe. During heating, air and combustible gas enter the combustion chamber, the movable fire damper disk is arranged on a supporting rod in the master pipe blank of the main steam super pipe and is in fit with the inner wall of the master pipe through a circular arc surface, and a fire is lighted for heating. By using the local heater, the master pipe blank of the main steam super pipe can be heated uniformly and rapidly to the target temperature required by plastic deformation of the material within 40 minutes; and due to the local heating, the fuel consumption is reduced and large deformation of the master pipe is prevented when the master pipe is reversely penetrated by a molding punch head.

Description

technical field [0001] The invention relates to a local heater used in the nozzle forming process of a main steam super pipeline for nuclear power and a method for heating a main pipe blank. Background technique [0002] At present, the domestic and international nuclear power generation markets are huge, and nuclear power technology is being updated rapidly. The super pipe is an important part of the steam pipe, and the production technology of the main steam super pipe nozzle has changed according to the nuclear power design requirements. According to the design requirements of nuclear power, the nozzle of the main steam super pipe must be integrally forged with the parent pipe, so that the fibers of the nozzle and the pipe are continuous. This requires that the nozzles of the super pipes cannot be formed by previous welding methods. However, the connection method of the nozzle of the super pipeline produced by the traditional method is just welding, and the quality is d...

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Problems solved by technology

The connection method of the nozzle of the super pipeline produced by the traditional method is just welding, and the quality is difficult to meet the requirements of the complex working conditions of nuclear power plants.

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