Investigations on the chloride corrosion characteristics and prevention on heating surface of power station boilers
With the proposal of the national dual carbon strategy,power station boilers tend to develop towards high parameters.In order to investigate the chlorine corrosion that may exist during the combustion of typical high-chlorine coal in Xinjiang in high-parameter boilers and to investigate its protective measures,the chlorine corrosion resistance of Super 304,T92,C-HRA-5,TP347H,and 12Cr1MoV were compared and the effect of corrosive temperatures(600,650,and 700℃)on the chlorine corrosion characteristics were investigated in the atmosphere of simulating burning high-chlorine coal in high-parameter boilers.The chlorine corrosion resistance of Inconel 625 coatings with different yttrium oxide contents(0％,0.2％,0.4％,0.6％and 0.8％)were also studied.The results show that the cor-rosion temperature has a great influence on the chlorine corrosion resistance of the material,and when the temperature is higher than 700 ℃,some of the materials will have great deformation,and Super 304,T92,C-HRA-5,TP347H and 12Cr1MoV are unable to meet the actual production use.At 650 ℃,C-HRA-5 and TP347H perform better with fitted corrosion weight gain curves of y2=312.371x,R2=0.96 and y=1.927x,R2=0.94.Inconel 625 coating significantly improves the 12CrlMoV substrate resistance to chloride corrosion.With the increase of yttrium oxide content in the coating,the anti-chlorine corrosion effect shows a trend of first increase and then de-crease,adding 0.4％yttrium oxide has the best effect.
power station boilershigh chlorine coalchlorine corrosionlaser claddinginconel 625
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