论文部分内容阅读
在“环境破坏说”的基础上阐释了锅炉高温受热面氧化皮剥落的理论.双层氧化皮内、外层界面存在的空穴是氧化皮剥落的内因,氧化皮承受的应力是氧化皮剥落的外因.氧化皮空穴的成因又可分为内因和外因,内因主要是金属含铬量,外因主要包括蒸汽参数和蒸汽含氧量等.主蒸汽含氧量与铬酸根含量之间具有显著的正相关性,而主蒸汽氢电导率是反映氧化皮铬蒸发的特征指标.外层氧化皮剥落以后,内层氧化皮会继续增厚,但难以剥落.对于已经发生了氧化皮大面积剥落的超(超)临界锅炉,如果检查确认高温受热面氧化皮剥落比较完全,剥落之氧化皮清理比较彻底,则在相当长时期内氧化皮剥落问题都将不再是运行忧患.
Based on the theory of environmental damage, the theory of exfoliation of high temperature heated surface of boiler is expounded.The cavities in the interface between the inner and outer layers of the double layer scale are the internal cause of scale exfoliation, the stress that the scale is exposed to is oxidized Skin exfoliation of the external cause of oxide skin can be divided into internal causes and external causes, internal causes are mainly metal chromium content, external factors include steam parameters and steam oxygen content, etc. Main steam oxygen content and chromate content between Has a significant positive correlation, while the main steam hydrogen conductivity is a reflection of chromium oxide scale characteristics of the exfoliation.Outside the scale after peeling, the inner oxide scale will continue to thicken, but difficult to peel off.For the large oxide scale has occurred Exfoliation area of the super (super) critical boilers, if the inspection confirmed that hot surface oxide skin peeling more complete, exfoliating the oxide skin clean more thoroughly, then for a long period of scale peeling problem will no longer be operational risk.