垃圾焚烧电厂过热器管腐蚀泄漏机制分析

华电技术 ›› 2017, Vol. 39 ›› Issue (4): 24-27.

垃圾焚烧电厂过热器管腐蚀泄漏机制分析

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1.广东科立恩环保科技有限公司，广州〓510075；2.广东电网有限责任公司电力科学研究院，广州〓510080

出版日期:2017-04-25 发布日期:2017-05-23

Corrosion leakage mechanism analysis of super heater tubes for refuse incineration power plant

1.Guangdong Clean Environmental Protection Technology Company Limited, Guangzhou 510075, China; 2.Electric Power Research Institute of Guangdong Power Grid Company Limited, Guangzhou 510080, China

Online:2017-04-25 Published:2017-05-23

摘要/Abstract

摘要：

为解决实际生产过程中垃圾焚烧炉过热器频繁泄漏问题，针对某垃圾焚烧电厂生产过程中过热器泄漏的腐蚀管道，采用扫描电子显微镜及能谱仪(SEM-EDS)、离子色谱仪(IC)、X射线荧光光谱分析仪(XRF)、X射线衍射仪(XRD)进行全面分析，深入探讨该垃圾焚烧炉过热器管道的腐蚀机制，并对如何预防过热器腐蚀泄漏提出建议。研究结果表明：气态氯腐蚀和碱金属积灰腐蚀是垃圾焚烧炉过热器管壁腐蚀泄漏的根本原因。垃圾焚烧过程中产生的HCl和Cl2扩散至管壁金属内层在氧化性气氛下发生气态氯腐蚀侵蚀管壁，与烟气中的SO2形成协同腐蚀，恶化腐蚀形成点蚀坑导致泄漏。垃圾焚烧过程中产生的碱金属化合物在局部外管壁沉积形成积灰，烟气中SO2穿透积灰层和部分碱金属化合物反应形成碱金属硫酸盐,在氧化性气氛下发生碱金属硫酸化腐蚀侵蚀管壁。积灰中部分碱金属氯化物在氧化性气氛中直接侵蚀壁面含铁氧化膜加剧管壁腐蚀。

关键词:

">">垃圾焚烧炉, 过热器管道, 腐蚀机制, 泄漏">

Abstract:

In order to solve the frequently occurred leakage problem of super heater in the actual production process of refuse incinerator, this paper conducted a comprehensive analysis of the corroded tube of a certain refuse incineration power plant using the scanning electron microscope with energy disperse spectroscopy (SEMEDS), ion chromatograph (IC), Xray fluorescence (XRF) and Xray diffraction (XRD), discussed its corrosion mechanism, and proposed some suggestions on how to prevent the corrosion leakage of super heater. The study shows that gaseous chlorine corrosion and alkali metal ash deposit corrosion are the root causes of corrosion leakage of super heater tubes. For gaseous chlorine corrosion, the HCl and Cl2 produced by refuse incineration could spread to the metal lining of tube wall and corrode it under oxidizing atmosphere, and together with the SO2 in flue gas, the synergistic effect would accelerate the corrosion and form some corrosion pits, which may lead to a leakage eventually. For alkali metal ash deposit corrosion, the alkali metal compound produced by refuse incineration deposits at the outside of tube wall, and the SO2 in flue gas could react with alkali metal compounds to form alkali metal sulfates, which could corrode the tube wall under oxidizing atmosphere. Besides, part of the alkali metal chlorides in ash deposition could corrode the ferruginous oxide film under oxidizing atmosphere, which also could accelerate the corrosion of tube wall.

Key words:

refuse incinerator, super heater tube, corrosion mechanism, leakage

李莉1，宋景慧2. 垃圾焚烧电厂过热器管腐蚀泄漏机制分析[J]. 华电技术, 2017, 39(4): 24-27.

LI Li1，SONG Jinghui2.

Corrosion leakage mechanism analysis of super heater tubes for refuse incineration power plant

[J]. Huadian Technology, 2017, 39(4): 24-27.

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