Header of 630 DEG C steam parameter ultra-supercritical unit boiler

Abstract

Disclosed is a header of a 630 DEG C steam parameter ultra-supercritical unit boiler. With improving of the environment-friendly and pollution discharging requirements, development of the efficient, clean and environment-friendly high-parameter power station boiler is imperative. The parameter of the power station boiler is improved, but the accompanying problem is that the steam oxidation resistant performance of martensitic heat resistant steel of header pipe connectors is insufficient. The header is composed of a header body (1) and the header pipe connectors (2). One ends of the pipe connector is welded to a high-temperature heating face pipe, and the other ends of the pipe connectors are welded to the header body through an inserting type full penetration welding type fillet weld. Theheader body adopts a G115 large-diameter pipe, and the pipe connectors adopt G115 small-diameter pipes (3), wherein a nickel-base alloy (4) is arranged on the inner wall of each G115 small-diameter pipe in a laser cladding mode. The header is applied to the 630 DEG C steam parameter ultra-supercritical unit boiler.

Description

Technical field: [0001] The invention relates to a header of an ultra-supercritical unit boiler with a steam parameter of 630°C. Background technique: [0002] At present, the boiler with the highest pressure, highest temperature and highest efficiency in the world, the steam temperature is 605 / 623 / 623°C, and the coal consumption for power generation is 256.16 grams per kWh. The difference is not big, but the material needs to withstand higher temperature and higher pressure. At the same time, higher requirements are put forward for the steam oxidation resistance of the new boiler material components, especially the boiler header and pipe joints. [0003] Due to the high temperature of the pipe joints used for the boiler header of the steam parameter ultra-supercritical unit at 630°C, the anti-oxidation performance of G115 material cannot meet the requirements of use, resulting in the use of G115 header for the steam parameter ultra-supercritical unit boiler at 630°C cannot ...

AI Technical Summary

Problems solved by technology

[0003] Due to the high temperature of the pipe joints used for the boiler header of the steam parameter ultra-supercritical unit at 630°C, the anti-oxidation performance of G115 material cannot meet the requirements of use, resulting in the use of G115 header for the steam parameter ultra-supercritical unit boiler at 630°C cannot guarantee the safety of the unit operational reliability

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