With the increasing efforts of the state to comprehensively control air pollution,the boilers in Tianjin have basically completed the low-nitrogen transformation.At present,the methods of low nitrogen transformation include graded combustion,premixed combustion and gas recirculation combustion.In the internal inspection of a low-nitrogen modified gas sub-high pressure boiler,it was found that the upper part of the furnace tube was generally oxidized.The furnace tube was tested by metallograph detection,hardness detection and wall thickness detection,failure analysis was carried out,and corresponding improvement measures were put forward.
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