Numerical analysis of stresses of steam-side oxide scales in boiler high-temperature heating surface in shutdown process

doi:10.3969/j.issn.0438-1157.2013.04.044

CIESC Journal ›› 2013, Vol. 64 ›› Issue (4): 1444-1452.DOI: 10.3969/j.issn.0438-1157.2013.04.044

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Numerical analysis of stresses of steam-side oxide scales in boiler high-temperature heating surface in shutdown process

BIAN Caixia¹, ZHOU Keyi², ZHU Zhenglin¹, XU Jianqun²

1. School of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing 211167, Jiangsu, China;
2. School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China

Received:2012-06-25 Revised:2012-09-19 Online:2013-04-05 Published:2013-04-05
Supported by:
supported by the Science Foundation of Nanjing Institute of Technology(YKJ201211) and the National Natural Science Foundation of China(51176031).

停机过程中锅炉高温受热面蒸汽侧氧化膜的应力分析

边彩霞¹, 周克毅², 朱正林¹, 胥建群²

1. 南京工程学院能源与动力工程学院,江苏南京211167;
2. 东南大学能源与环境学院,江苏南京210096

通讯作者: 边彩霞
作者简介:边彩霞(1978—),女,博士研究生,讲师。
基金资助:
南京工程学院校级科研基金项目(YKJ201211);国家自然科学基金项目(51176031)。

Abstract

Abstract: Exfoliation of steam-side oxide scale in heating surface occurring during load reduction severely affects the safety of thermal power plants.Through building the finite element model for steady stress analysis,the stresses in steam-side oxide scales during unit load drop were calculated and analyzed.Ferrite alloy represented by T91 and austenitic alloy represented by TP347H were investigated in this paper. Through analyzing each of the stress components and the von Mises equivalent stress,the change of the stresses in steam-side oxide scales for both ferrite alloy and austenitic alloy during unit load drop was revealed.The possible failure modes of steam-side oxide scales for both alloys were illustrated,and it could also be concluded that the exfoliation of steam-side oxide scales for ferrite alloy and austenitic alloy was more liable to occur in the final stage and in the initial stage of load reduction respectively.

Key words: boiler, heating surface, steam-side oxide scale, exfoliation, stress

摘要： 电站锅炉高温受热面蒸汽侧氧化膜在机组停机降负荷时可能发生脱落,对安全性构成严重威胁。通过建立有限元分析模型,对锅炉停机过程中受热面蒸汽侧氧化膜内的应力进行了计算和分析。对铁素体合金和奥氏体合金进行了研究,其中铁素体合金以T91为代表,奥氏体合金以TP347H为代表。通过对各应力分量以及von Mises等效应力进行分析,揭示机组降负荷过程中两种合金管蒸汽侧氧化膜内应力的变化规律,阐明两种合金管蒸汽侧氧化膜可能的失效模式,同时得出了铁素体合金管和奥氏体合金管蒸汽侧氧化膜分别在负荷降低后期和初期容易发生脱落的结论。

关键词: 锅炉, 受热面, 蒸汽侧氧化膜, 脱落, 应力

CLC Number:

TK223

BIAN Caixia, ZHOU Keyi, ZHU Zhenglin, XU Jianqun. Numerical analysis of stresses of steam-side oxide scales in boiler high-temperature heating surface in shutdown process[J]. CIESC Journal, 2013, 64(4): 1444-1452.

边彩霞, 周克毅, 朱正林, 胥建群. 停机过程中锅炉高温受热面蒸汽侧氧化膜的应力分析[J]. 化工学报, 2013, 64(4): 1444-1452.

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Numerical analysis of stresses of steam-side oxide scales in boiler high-temperature heating surface in shutdown process

停机过程中锅炉高温受热面蒸汽侧氧化膜的应力分析

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