Construction method for hoisting tube row of high temperature reheater

Abstract

The invention discloses a hoisting construction method of pipe rows of a high-temperature reheater. The hoisting construction method comprises the steps of (1) equipment checking and inspection; (2) ball passing of the pipe rows; (3) header sweeping; (4) spectral analysis; (5) pipe opening cleaning; (6) combined hoisting of inlet and outlet headers; (7) alignment welding of the headers; (8) combination of the pipe rows of the high-temperature reheater; (9) hoisting of the pipe rows; and (10) alignment welding of the pipe rows. The hoisting construction method is characterized in that during the hoisting construction process of the pipe rows, a hoisting reserved channel of the pipe rows of the high-temperature reheater is determined according to the on-site boiler force energy arrangement, steel wire ropes and single pulleys of corresponding models are selected according to the weight of the pipe rows, centers of fixed points on steel frames at the two ends of the pipe rows are determined according to the center size of the pipe rows, portal frames are arranged at the two ends, the portal frames are connected with a boiler steel structure through hoops, the steel wire ropes and the single pulleys are mounted, and a 10 t hand pulling chain block is mounted between the steel wire rope and the fixed point on one side to adjust tightness of the steel wire ropes. According to the hoisting construction method, hoisting efficiency is high, mounting time is short, and construction period can be effectively shortened.

Description

Technical field: [0001] The invention relates to a hoisting construction method, in particular to a hoisting construction method for high-temperature reheater tube rows. Background technique: [0002] With the continuous increase of power grid capacity, the 660MW domestic supercritical unit has gradually become the main unit. Only by continuously optimizing and innovating the boiler installation technology with the increase of unit capacity can it adapt to the requirements of market competition. Inner Mongolia Helin Power Plant 2 The new project of ×660MW unit is designed by Dongfang Boiler Co., Ltd. The high-temperature reheater is arranged in the horizontal flue behind the high-temperature superheater. The composition is composed of SA213T91 / SA335P91 and 12Cr1MoVG, 68 pieces in total, the unit weight of the tube row is 2.1t, the distance between the tube row and the tube row is 324.9mm, and the minimum gap between the tube row and the center of the tube row at the bottom o...

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Problems solved by technology

[0002] With the continuous increase of power grid capacity, the 660MW domestic supercritical unit has gradually become the main unit. Only by continuously optimizing and innovating the boiler installation technology with the increase of unit capacity can it adapt to the requirements of market competition. Inner Mongolia Helin Power Plant 2 The new construction of ×660MW units is designed by Dongfang Boiler Co., Ltd. The high-temperature reheater is arranged in the horizontal flue behind the high-temperature superheater. The specifications of the pipes are Φ51mm×4mm, Φ51mm×4.5mm and Φ57mm×4mm, and the material is The composition is composed of SA213T91 / SA335P91 and 12Cr1MoVG, 68 pieces in total, the unit weight of the tube row is 2.1t, the distance between the tube row and the tube row is 324.9mm, and the minimum gap between the tube row and the center of the tube row at the bottom of the horizontal flue is only 254.87mm, the steam enters the high re-export header from the high-re-inlet header after being heated by the serpentine pipe row. The high-temperature reheater inlet and outlet headers are arranged above the pipe row. The 4 rows of pipes are loaded and transferred to the inlet header, and the weight of the remaining pipes is transferred to the middle 4 pipes one by one through the load-bearing block. The weight of the outlet section of the pipe is supported by the transition beam and transferred to the high outlet header by the boom In order to reduce the flow deviation and make the wall temperature of each pipe in the same pipe row relatively similar, an orifice is set on the high re-inlet header. Because there are many boom beams in the ceiling area of ​​the high-temperature reheater, the gap from the top is very small, and the construction inconvenient

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