摘要
为解决燃用高硫煤的超临界、超超临界机组锅炉受热面发生的高温硫腐蚀与冲蚀磨损,采用超音速火焰喷涂技术,喷涂自主开发的NiCr金属陶瓷涂层,研究该涂层的抗高温硫腐蚀性能以及冲蚀磨损性能,并通过现场挂片试验,考察涂层经过8 000 h服役后的剥落情况。喷涂态NiCr金属陶瓷涂层孔隙率为0.55%。在700℃环境中的高温硫腐蚀试验结果表明NiCr金属陶瓷涂层具有比2Cr13高的抗高温硫腐蚀能力,同时该涂层具有较高的抗冲蚀磨损性能。该研究利用超音速火焰喷涂的NiCr金属陶瓷涂层在贵州某燃用硫含量为2.81%的高硫煤火电厂中经8000h现场挂片服役后,涂层表面完好,结果表明该NiCr金属陶瓷涂层可有效提高超临界、超超临界机组受热面的抗高温硫腐蚀和磨损性能。
In order to solve the high temperature sulfur corrosion and solid-particle erosion on the heating surfaces of ultra-supercritical unit fired with high sulfur content coal,high velocity oxygen fuel(HVOF) was employed to deposit the self-developed NiCr cermets coatings on 2Cr13 substrates.The performance of the HVOF NiCr cermets coating and 2Cr13 substrate against high temperature sulfur corrosion and solid-particle erosion was studied.The integrity of the coating after 8000 h in service was examined through exposure testing.The porosity of the HVOF NiCr cermets coating is 0.55%.The results of the high temperature sulfur corrosion test at 700oC and the solid particle erosion tests indicate that the developed NiCr cermets coating exhibits a high resistance to high temperature sulfur corrosion and solid-particle erosion.Spalling of the HVOF NiCr cermets coating does not occur after 8 000 hours in service in ultra-supercritical unit which fired with high-sulfur coal with a sulfur content of 2.81%.The results show that the developed NiCr cermets coating can effectively improve the performance of the heating surface against high temperature sulfur corrosion and erosion.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2012年第20期120-125,149,共6页
Proceedings of the CSEE
关键词
超超临界机组
硫腐蚀
冲蚀
超音速火焰喷涂
NiCr金属陶瓷涂层
ultra-supercritical unit; sulfur corrosion; erosion; high velocity oxygen fuel(HVOF); NiCr cermets coating