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Manufacturing technology for membrane wall of steel tube of ultra-supercritical large boiler

A large-scale boiler, ultra-supercritical technology, applied in the direction of manufacturing tools, metal processing equipment, auxiliary equipment, etc.

Inactive Publication Date: 2016-11-23
JIANGSU GREENLEAVES BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tube rows welded by these two materials are all flat rows, and there is no tube row opening structure and no row bending structure. In order to meet the needs of the development of power plant boiler manufacturing, it is necessary to develop, design and manufacture super (super) critical boiler steel tube membranes. A New Process for Form Wall Manufacturing

Method used

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  • Manufacturing technology for membrane wall of steel tube of ultra-supercritical large boiler
  • Manufacturing technology for membrane wall of steel tube of ultra-supercritical large boiler
  • Manufacturing technology for membrane wall of steel tube of ultra-supercritical large boiler

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Embodiment Construction

[0012] A manufacturing process of an ultra-supercritical large-scale boiler steel tube membrane wall, comprising the following steps:

[0013] 1 、 Selection of welded materials: According to the chemical composition and mechanical properties of SA213-T22 and SA213-T23 pipes, the chemical composition of welding materials for SA213-T22 and SA213-T23 pipes and SA387Gr22 flat steel is shown in Table 1:

[0014] Chemical composition of welding materials (%) Table 1

[0015]

[0016] 2. Selection of welded welding specifications: SA213-T22 and SA213-T23 pipes are low-alloy heat-resistant steels. The materials have certain hardenability and the welding stress of the welded fillet joints is relatively large. In order to avoid welding cold cracks, welding The preheating temperature is 150°C; in order to ensure the quality of the rows of bends, the tempering treatment is adopted at 720±10°C after welding; the welding specification is based on the conventional φ2.0 welding wire;

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Abstract

The invention discloses a manufacturing technology for a membrane wall of a steel tube of an ultra-supercritical large boiler. The manufacturing technology comprises the steps of 1) section of rowingwelding materials; 2) selection of a rowing welding specification; 3) boring and assembly of the membrane wall; and 4) technological test. According to the manufacturing technology, before rowing andbending, tube rows are subjected to thermal treatment, so that the quality of rowed and bent tube rows is guaranteed; auxiliaries such as pored tubes are mounted and welded after the tube rows are rowed and bent, and then, the final thermal treatment is carried out; through a tube row manufacturing test, sufficient preparation is made to the membrane wall of the ultra-(super) supercritical large boiler; as low-alloy thermal resistant steel, SA213-T22 and SA213-T23 tubes have certain hardenability, welding stress of a rowing welding corner connector is relatively large, and 150-DEG C preheatingtemperature is adopted to prevent welding a cold crack; and after welding, tempering treatment with the temperature of (720 + / - 10) DEG C is adopted to guarantee the rowing and bending quality.

Description

technical field [0001] The invention relates to a manufacturing process of a membrane wall of an ultra-supercritical large-scale boiler steel pipe, and belongs to the technical field of operation control of large-scale thermal power plants. Background technique [0002] With the development trend of power plant boilers towards large capacity and high parameters, conventional carbon steel pipes and 1Cr-0.5Mo steel pipes can no longer meet the requirements of the working temperature of membrane tube banks, and will be replaced by 2.25Cr-1Mo (SA213-T22) steel pipes and 2.25 Cr-1.6W-Nb-V (SA213-T23) steel pipe. Our company has accumulated SA213-T22 steel pipe (US CFB boiler) and SA213-T23 steel pipe (Jinshan CFB boiler) from subcontracted ASME boiler products. However, the tube rows welded by these two materials are all flat rows, there is no tube row opening structure, and there is no row bending structure. In order to meet the needs of the development of power plant boiler ma...

Claims

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Application Information

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IPC IPC(8): B23K37/00
Inventor 周昊周新良马文俊
Owner JIANGSU GREENLEAVES BOILER
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