摘要
对某电厂DG1025/18.2-Ⅱ(5)型锅炉中微量喷水减温器弯头产生裂纹的原因进行了分析,结果表明,弯头是因受到较大的交变热应力作用,而产生裂纹.裂纹呈直线丛状密集分布,为热疲劳应力腐蚀裂纹.通过采取改变运行条件,降低减温水的喷洒量,并对弯头结构进行改造,可以降低热应力,避免热疲劳裂纹的产生.
The cracks on the pipe elbow of the micro-spraying type desuperheater for the DG1025/18.2-Ⅱ（5） type boiler in a power plant were analyzed. It is shown that the cracks distributed intensively in a linear, plexiform-like form due to the alternating thermal stress and thermal fatigue stress corrosion cracking. The thermal stress could be significantly reduced through the change of the operating conditions, the reduction of the spraying amount of water, and the improvement of the bend structure. Consequently, the thermal fatigue stress corrosion cracking could be avoided.
出处
《材料研究与应用》
CAS
2007年第4期315-317,共3页
Materials Research and Application
关键词
电站锅炉
减温器
弯头
裂纹
措施
power plant boiler
desuperheater
pipe elbow
crack
countermeasures
