The heating surface tube of the steam-cooled cyclone separator of the supercritical circulating fluidized bed(CFB)boiler failed once.In order to prevent similar failures from happening again,the faulty tube was tested and analyzed.The ultra-low emission selective non-catalytic reduction(SNCR)denitrification system corroded refractory materials and the heating surface tube,and the products of decomposition at the high temperature reacted with the metal of the tube,causing the effective wall thickness of the tube to be thinned.Finally,it failed because it could not bear the pressure of the internal medium.In combination with the operating status and causes of the failure of the tube,the operating reliability was effectively improved by taking such measures as optimizing the fixing method of refractory materials,optimizing the materials,improving the inspecting intensity of wear and explosion prevention,and optimizing the atomized air pressure,which has a great significance of popularization in the maintenance of the steam-cooled cyclone separator.
关键词
超临界循环流化床锅炉/汽冷式旋风分离器/受热面/耐火材料/优化措施
Key words
supercritical circulating fluidized bed boiler/steam-cooled cyclone separator/heating surface/refractory material/measure of optimization
维普
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