High-temperature corrosion behavior of S30432 in high-efficiency ultra-supercritical boiler burning low-alkali and high-sulfur coal-Reference-Cited by-同舟云学术

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

Published:2023-08-15 Issue:6 Volume:41 Page:679-688
ISSN:2191-0316
Container-title:Corrosion Reviews
language:en
Short-container-title:

Author:

Liu Yugang¹²³,Liu Yinhe¹,Mo Chunhong³⁴,Ran Shenming³⁴,Yin Chaoqiang³⁴

Affiliation:

1. State Key Laboratory of Multiphase Flow in Power Engineering , Xian Jiaotong University , Xi’an , Shaanxi , China

2. Dongfang Boiler Group Co., Ltd. , Chengdu 611731 , China

3. Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Province , Chengdu , Sichuan , China

4. Dongfang Boiler Group Co., Ltd. , Zigong , Sichuan , China

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.

Publisher

Walter de Gruyter GmbH

Subject

General Materials Science,General Chemical Engineering,General Chemistry

Link

https://www.degruyter.com/document/doi/10.1515/corrrev-2022-0065/pdf

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