At the same time, calculate corrosion velocity by actual thickness data and residual lifetime.

同时,根据实测的省煤器管壁数据得到腐蚀速率, 计算省煤器管的剩余寿命.

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PO _ 4~ ( 3 - ), NO _ 2~ -- N and a small quantity of Ca ~ ( 2 + ) and HCO 3 - could reduce corrosion velocity.

PO_4~ ( 3- ) 、 NO_2~ --N 以及少量的Ca~ ( 2+ ) 和HCO3-对腐蚀有一定的抑制作用.

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