HVOF喷涂用于提高锅炉换热面耐磨损耐腐蚀性能综述  

Summary of improving erosion and corrosion resistance of heat exchange surfaces in boilers through HVOF technology

作　　者：李海燕 刘欢[1,2] 张秀菊 王阁义 周巧燕 陈同舟 姚洪 LI Haiyan;LIU Huan;ZHANG Xiuju;WANG Geyi;ZHOU Qiaoyan;CHEN Tongzhou;YAO Hong(State Key Laboratory of Coal Combustion,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;Department of New Energy Science and Engineering,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;Wuhan Research Institute of Materials Protection,Wuhan 430030,Hubei,China)

机构地区：[1]华中科技大学能源与动力工程学院,煤燃烧国家重点实验室,湖北武汉430074 [2]华中科技大学能源与动力工程学院,新能源科学与工程系,湖北武汉430074 [3]武汉材料保护研究所有限公司,湖北武汉430030

出　　处：《化工学报》2021年第4期1833-1846,共14页CIESC Journal

基　　金：湖北省技术创新专项重大项目(2018ACA151);煤燃烧国家重点实验室开放基金项目(FSKLCCA1901)。

摘　　要：火力发电是我国的主要发电方式,在燃用煤、生物质等固体燃料时会面临锅炉换热面的冲蚀磨损或腐蚀问题,导致管道失效停炉,严重影响了电厂的安全稳定运行。超声速火焰(HVOF)喷涂作为热喷涂工艺的一种,可以通过在换热管道表面添加防护涂层来缓解磨损或腐蚀问题。因其制备的涂层具有与基体结合强度高、孔隙率低等优异的特点,在锅炉换热面的耐磨损耐腐蚀方面研究及应用前景广阔。综述了HVOF喷涂的发展、工艺流程以及涂层的特性,并重点总结了用于提升锅炉换热面耐磨损耐腐蚀性能的HVOF涂层材料,以及不同材料应用时需要考虑的环境因素。最后从工艺优化、材料进步以及实验方法创新三个方面对HVOF工艺在锅炉换热面上的应用做出展望。Thermal power generation is main power generation method in China.When burning solid fuels such ascoal and biomass,it will face erosion and wear or corrosion problems on the heating exchange surface of the boiler,causing pipeline failure and shutdown of the boiler,seriously affecting the safe and stable operation of the powerplant.As one kind of thermal spraying technology,high velocity oxy-fuel(HVOF)spraying can alleviate the erosionand corrosion problem by adding protective coatings on the surface of the heat exchange tubes.Coatings prepared byHVOF spraying have good applicability under erosion and corrosion environment in boilers since their excellentcharacteristics such as high bonding strength and low porosity.The development of HVOF technology,the sprayingprocess and coating characteristics were reviewed in this article,and common anti-erosion/anti-corrosion coatingsand environmental factors needed to be considered when applying different coating materials were summarized.According to various literatures,the adopted anti-erosion HVOF coatings are mainly Ni Cr alloys,stellite alloys,WC-Co,Cr3C2-Ni Cr and other metal or cermet coatings.Comprehensive consideration of fly ash composition,erosion angle,and erosion temperature is needed when selecting coating materials in boilers.The adopted anti-corrosion coating materials are mainly Ni-based or Fe-based alloys,of which Ni-based materials are particularlydominant.The tube wall temperature and corrosive substances are the main environmental factors affecting theapplication of anti-corrosion coatings.Different from various options in literatures,coating materials used in actualboilers are quite simple,mainly Cr3C2-Ni Cr and Inconel 625 for erosion and corrosion protection respectively.Moreover,HVOF is not a common coating preparation technology mainly due to its high cost.To bridge the gapbetween researches and practical applications of HVOF coatings,spraying process optimization,progress in coatingmaterials and experimental method innovation is prospected in this

关 键 词：超声速火焰 制备 涂层 锅炉 换热面 磨损 腐蚀 

分 类 号：TK16[动力工程及工程热物理—热能工程]