High-temperature corrosion behavior of S30432 in high-efficiency ultra-supercritical boiler burning low-alkali and high-sulfur coal

IF 2.7 4区材料科学 Q3 ELECTROCHEMISTRY

Corrosion Reviews Pub Date : 2023-08-15 DOI:10.1515/corrrev-2022-0065

Yugang Liu, Yinhe Liu, Chunhong Mo, Shenming Ran, Chaoqiang Yin

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Abstract

Abstract In this study, the resistance of S30432 to low-alkali coal ash corrosion in a high-efficiency USC boiler was investigated. Currently, S30432 is widely used in the high-temperature superheater and reheater of boilers burning low-alkali and high-sulfur coal. During the experiment, S30432 coated with low-alkali coal ash were fixed in a high-temperature tubular reactor, and hot gas at 650 °C and 700 °C containing SO2 passed over the specimens for 2000 h. Then the specimens were tested by X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy. It was found that S30432 specimens mainly underwent high-temperature oxidation. For the gas temperature of 700 °C and SO2 volume concentration of 0.35 %, the sulfidation reaction occurred and the weight change was only 1.08 mg cm−2. The results show that there is no obvious high-temperature corrosion after three years of operation of a 700 MW 620 °C boiler. The results are in contrast with the high-alkali coal ash corrosion resistance of S30432. It is concluded that S30432 can meet the requirements of a high-efficiency USC boiler burning low-alkali and high-sulfur coal.

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S30432在燃用低碱高硫煤的高效超临界锅炉中的高温腐蚀行为

摘要在高效超超临界锅炉中，研究了S30432对低碱煤灰的耐蚀性。目前，S30432广泛应用于低碱高硫燃煤锅炉的高温过热器和再热器中。实验过程中，将包覆低碱煤灰的S30432固定在高温管式反应器中，分别在650 °C和700 °C含SO2的热气体通过试样2000 h。然后对样品进行x射线衍射、扫描电镜和能量色散光谱测试。发现S30432试样主要发生高温氧化。当气体温度为700 °C, SO2体积浓度为0.35 %时，硫化反应发生，质量变化仅为1.08 mg cm−2。结果表明，一台700 MW 620 ℃锅炉运行3年未发生明显的高温腐蚀。结果与S30432的耐高碱煤灰腐蚀性能形成对比。结果表明，S30432能够满足低碱高硫煤高效超超临界锅炉的要求。

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来源期刊

Corrosion Reviews 工程技术-材料科学：膜

CiteScore

5.20

自引率

3.10%

发文量

审稿时长

4.5 months

期刊介绍： Corrosion Reviews is an international bimonthly journal devoted to critical reviews and, to a lesser extent, outstanding original articles that are key to advancing the understanding and application of corrosion science and engineering in the service of society. Papers may be of a theoretical, experimental or practical nature, provided that they make a significant contribution to knowledge in the field.