国产660MW超超临界汽轮机插管密封性能提升的工艺优化

Process Optimization of Seal Performance Improvement for Domestic 660MW Ultra Supercritical Steam Turbine

摘要

国产660MW等级超超临界机组在高温高压与调峰启停条件下，高压进汽插管密封若出现微漏，泄漏汽可能沿内外缸夹层窜流，造成缸体局部过热、温差扩大及轴系振动波动。现场检修中常见的叠片金属密封对装配过盈与同心度敏感，热态差胀与磨耗叠加后，密封界面难以长期保持贴合。本文以中国国产660MW机组插管泄漏治理为工程背景，围绕复合密封、在线补偿、运行跟踪与检修提出成套工艺优化思路。

Abstract

For domestically produced 660MW ultra-supercritical units operating under high-temperature, high-pressure, and peak-shaving start-stop conditions, if a minor leak occurs in the high-pressure steam inlet tube seal, the leaking steam may flow through the interlayer between the inner and outer cylinders, causing localized overheating of the cylinder body, expansion of temperature differences, and axial vibration fluctuations. The commonly used laminated metal seals in field maintenance are sensitive to assembly interference and concentricity. After thermal expansion and wear, the sealing interface is difficult to maintain long-term contact. This paper, based on the engineering background of tube leakage treatment for China’s domestically produced 660MW units, proposes a comprehensive process optimization approach focusing on composite sealing, online compensation, operational tracking, and maintenance.

关键词

国产660MW超超临界汽轮机 / 插管 / 密封性能提升 / 工艺优化

Key words

Domestic 660MW ultra-supercritical steam turbine / tube insertion / sealing performance improvement / process optimization

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