Auxiliary device for heat treatment on sectional type deaerator terminating circumferential weld

Abstract

The invention discloses an auxiliary device for heat treatment of a sectioned deaerator terminal ring weld seam, which includes an outer ring locking device arranged on the outer periphery of the deaerator terminal ring weld seam, and is arranged on the deaerator terminal ring The inner top ring fastening device on the inner circumference of the weld, the inner top ring fastening device is equipped with a locking support seat, and a number of telescopic support arms are arranged on the outer periphery of the locking support seat, and the ends of each telescopic support arm are respectively against the On the inner surface of the inner top ring fastening device; the outer ring locking device compresses and fixes the heater and insulation cotton on the outer surface of the deaerator weld, and the inner top ring fastening device The insulation cotton on the inner surface of the welding seam of the deaerator is pressed and fixed, and the outer ring locking device and the inner top ring fastening device are set to realize the simultaneous heat preservation of the deaerator welding seam inside and outside, avoiding the end ring welding of the deaerator In seam heat treatment, only the heat loss caused by heat preservation on the outer side of the weld is too fast, and the heat treatment temperature rise is difficult caused by the large internal and external temperature difference, which helps to improve the quality of the project and shorten the construction period.

Description

technical field [0001] The invention relates to the technical field of heat treatment of a deaerator terminal girth weld, in particular to an auxiliary device for heat treatment of a segmented deaerator terminal girth weld. Background technique [0002] With the adjustment of the national energy structure, my country is vigorously developing clean power sources. Nuclear power and large-capacity thermal power units will be the main direction of the country's future power structure adjustment. With the continuous increase of the parameters of the unit, the volume of the deaerator continues to increase. In order to facilitate the transportation and hoisting of the deaerator, the deaerator is supplied in two sections, and welding heat treatment is required on site. [0003] At present, the traditional heat treatment method adopts the external binding heater and heat preservation of the welding joint for heat treatment, the heater is connected by iron wire, and the external heat ...

AI Technical Summary

Problems solved by technology

Using this method for heat treatment, the plasticity of the binding insulation cotton iron wire increases during the heating process, and the heater and insulation cotton will sag due to their own gravity, which will easily cause the insulation cotton at the lower part of the deaerator to be unable to be tightly bonded to the weld seam, directly affecting the deaeration One pass rate of heat treatment

In addition, due to the large space inside the deaerator, only the outside is kept warm, and the heat is lost too quickly, resulting in a large temperature difference between the inside and the outside. At the same time, it is difficult to heat up the heat treatment, which affects the quality of heat treatment.

[0004] To sum up, the two-stage deaerator in a nuclear power plant has a large volume and a long terminal girth weld, and its heat treatment has always been a key point and difficulty in construction

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