固废焚烧飞灰对金属高温腐蚀特性的电化学在线监测研究OA

The corrosion of heat exchange tube walls in industrial solid waste incineration boilers not only compromises combustion efficiency but also deteriorates the structural integrity of the metal,thereby increasing the risk of tube rupture.To address the challenges of accurately measuring real-time metal corrosion rates and explore the unclear corrosion mechanisms on the high-temperature flue gas side,this study establishes a high-temperature corrosion experimental platform to simulate the conditions within boilers.Through electrochemical methods and weight loss techniques,this research systematically investigates the factors influencing corrosion rates of tube walls as well as the corrosion resistance of various metal elements.The findings reveal that an increase in chlorine content within fly ash significantly accelerates corrosion rates,while the introduction of an appropriate amount of sulfate inhibits chlorine-induced corrosion.The temperature's effect on corrosion rates follows the Arrhenius equation,with a more pronounced rate change observed between 550 and 650℃ than in the range of 450 to 550℃.The corrosion resistance hierarchy of the metals studied is Ni＞Cr＞Fe,with higher Ni content in alloys enhancing the material's corrosion resistance.This study provides critical insights into the in-situ online measurement of corrosion rates in heat exchange tubes of industrial solid waste incineration boilers and offers guidance for developing effective anti-corrosion strategies.