Header of 620-DEG C steam parameter ultra supercritical unit boiler

A technology of ultra-supercritical units and steam parameters, which is applied in the direction of boiler drum/box header, etc., and can solve the problems of unsatisfactory operation safety and reliability of the boiler outlet header

Inactive Publication Date: 2015-11-18
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the high temperature of the outlet header pipe joint of the steam parameter exceeding 620°C, the operation safety and reliability of the existing boiler outlet header cannot meet the requirements of the exceeding 620°C unit

Method used

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  • Header of 620-DEG C steam parameter ultra supercritical unit boiler

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Embodiment Construction

[0014] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0015] The invention provides a new type of superheater outlet header or reheater outlet header used in an ultra-supercritical unit with steam parameters exceeding 620°C. The material uses 9Cr-3W-3Co large-diameter pipes and small-diameter pipes. Such as figure 1 As shown, including the outlet header of the final superheater or the outlet header 1 of the final reheater, the material is 9Cr-3W-3Co large-diameter tube; the header base 2 is made of 9Cr-3W-3Co small-diameter tube, The inner diameter of the header pipe seat 2 is greater than 35mm, and the inner wall of the header pipe seat 2 is surfacing welded with nickel-based alloy 4 except for the area 15-20mm away from the outlet header of the final superheater or the outlet header 1 of the final reheater. ; The tube 3 of the final stage superheater or final stage reheater is mad...

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Abstract

The invention relates to a header of a 620-DEG C steam parameter ultra supercritical unit boiler. The header of the 620-DEG C steam parameter ultra supercritical unit boiler comprises a header main body and a pipe seat, wherein one end of the pipe seat is welded with the header main body, and the other end of the pipe seat is welded with a final-stage superheater or final-stage reheater pipe. The header is characterized in that the header main body is made by a 9Cr-3W-3Co large-diameter pipe, the pipe seat is made by a 9Cr-3W-3Co small-diameter pipe, the inner diameter of the pipe seat is larger than 35mm, and Ni-based alloy is welded on the inner wall of the pipe seat except the region which is 15-20mm away from the header. The header provided by the invention is a novel superheater outlet header or reheater outlet header applied to the 620-DEG C steam parameter ultra supercritical unit boiler, and the 9Cr-3W-3Co large-diameter pipe is used as the material. The high-temperature oxidation performance of the material is great, and the practical value is high.

Description

technical field [0001] The invention relates to an outlet header applied to the final-stage superheater or final-stage reheater of a boiler of an ultra-supercritical unit with steam parameters exceeding 620°C. Background technique [0002] With the rapid development of the national economy, energy shortages and environmental degradation are becoming more and more serious, especially the smog that has swept the central and eastern regions in recent years has attracted great attention at home and abroad. Among the air-polluting emissions, the emissions of pollutants (mainly carbon dioxide) from coal-fired power stations account for an important part of the total emissions. main strategic goals. It has been proved that improving the steam parameters of the generator set and improving the power generation efficiency is an important way to reduce coal consumption and reduce pollutant emissions. [0003] Under the above background, ultra-supercritical units with reheat steam par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B37/22
Inventor 王炯祥王煜金用强李强王崇斌王建泳郑子杰王育翔
Owner SHANGHAI BOILER WORKS
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