针对多数电厂在低氮燃烧还原性气氛下水冷壁高温腐蚀严重的现状,在高温管式炉中进行水冷壁材料15Cr Mo G的高温腐蚀试验.试验中以配制好的标气模拟锅炉水冷壁贴壁处的2种还原性气氛,试片表面涂积灰模拟灰腐蚀影响.通过腐蚀增重曲线分析...针对多数电厂在低氮燃烧还原性气氛下水冷壁高温腐蚀严重的现状,在高温管式炉中进行水冷壁材料15Cr Mo G的高温腐蚀试验.试验中以配制好的标气模拟锅炉水冷壁贴壁处的2种还原性气氛,试片表面涂积灰模拟灰腐蚀影响.通过腐蚀增重曲线分析不同气氛和积灰对于腐蚀的影响,采用扫描电子显微镜(SEM)和能量色能谱(EDS)观测材料试片的腐蚀微观形貌和元素成分,研究高温腐蚀机理.结果表明,CO+H_2S+O_2+N_2气氛比H_2S+O_2+N_2气氛的腐蚀能力更强,CO使得腐蚀能够持续进行,有积灰试片的腐蚀程度略高于无积灰试片;致密氧化层以及Cr元素向金属基体富集的特性能够减缓H2S渗透腐蚀,CO的存在削弱氧化层和Cr的保护作用;积灰中的碱金属能够向金属基体迁移,碱金属盐类能够破坏氧化层并且侵蚀金属基体,但是在还原性气氛下积灰腐蚀受到一定抑制.展开更多
Pulverized coal-fired(PCF) boilers were first and foremost intended to fire pulverized hard or brown coal. However, biomass co-firing has become a fairly common practice in the Polish power generation system and many ...Pulverized coal-fired(PCF) boilers were first and foremost intended to fire pulverized hard or brown coal. However, biomass co-firing has become a fairly common practice in the Polish power generation system and many existing boilers have been modernized to serve this purpose. This paper presents calculations of the coefficient of thermal efficiency of the boiler heating surfaces and of the time needed for complete reconstruction of deposits on the second-stage steam reheater(RHII) of an OP-380 boiler with the output of 380×10~3 kg/h. The boiler was equipped with a purpose-designed installation of direct feeding of biomass. The main co-fired fuels were wood and sunflower husk pellets. Intense formation of deposits on the steam reheater tubes and problems related to a reduction in the diameters of the tubes were identified during the power unit operation.展开更多
文摘针对多数电厂在低氮燃烧还原性气氛下水冷壁高温腐蚀严重的现状,在高温管式炉中进行水冷壁材料15Cr Mo G的高温腐蚀试验.试验中以配制好的标气模拟锅炉水冷壁贴壁处的2种还原性气氛,试片表面涂积灰模拟灰腐蚀影响.通过腐蚀增重曲线分析不同气氛和积灰对于腐蚀的影响,采用扫描电子显微镜(SEM)和能量色能谱(EDS)观测材料试片的腐蚀微观形貌和元素成分,研究高温腐蚀机理.结果表明,CO+H_2S+O_2+N_2气氛比H_2S+O_2+N_2气氛的腐蚀能力更强,CO使得腐蚀能够持续进行,有积灰试片的腐蚀程度略高于无积灰试片;致密氧化层以及Cr元素向金属基体富集的特性能够减缓H2S渗透腐蚀,CO的存在削弱氧化层和Cr的保护作用;积灰中的碱金属能够向金属基体迁移,碱金属盐类能够破坏氧化层并且侵蚀金属基体,但是在还原性气氛下积灰腐蚀受到一定抑制.
文摘Pulverized coal-fired(PCF) boilers were first and foremost intended to fire pulverized hard or brown coal. However, biomass co-firing has become a fairly common practice in the Polish power generation system and many existing boilers have been modernized to serve this purpose. This paper presents calculations of the coefficient of thermal efficiency of the boiler heating surfaces and of the time needed for complete reconstruction of deposits on the second-stage steam reheater(RHII) of an OP-380 boiler with the output of 380×10~3 kg/h. The boiler was equipped with a purpose-designed installation of direct feeding of biomass. The main co-fired fuels were wood and sunflower husk pellets. Intense formation of deposits on the steam reheater tubes and problems related to a reduction in the diameters of the tubes were identified during the power unit operation.
