Cause analysis and control measure study on heat exchanger corrosion in refining plant
In order to reduce the corrosion rate of heat exchangers in refineries and extend their service life,the coupon weight loss method was used to evaluate the corrosion rate of heat exchangers in target refining plant under different factors.Based on this,the pertinent corrosion control measures were studied,and the influence of new high-temperature resistant corrosion inhibitor HTS-2 on the corrosion protection effect was evaluated.The experimental results showed that the main causes of corrosion in the heat exchanger of the refining plant were experimental temperature,fluid flow rate,pH value and mineralization degree of the corrosive medium.The higher the experimental temperature,the greater the fluid flow rate,and the higher the mineralization degree of the corrosive medium,the higher the corrosion rate.The higher the pH value of the corrosive medium,the lower the corrosion rate.When the experimental temperature was 60℃,the fluid flow rate was 0.30 m/s,the pH value of the corrosive medium was 6,and the mineralization degree of the corrosive medium was 2 860 mg/L,the corrosion rate could reach 1.559 mm/a,indicating severe corrosion.When the mass fraction of the high-temperature resistant corrosion inhibitor HTS-2 was 2%,it could reduce the corrosion rate to 0.064 mm/a at 100℃,meeting the corrosion protection requirements of the heat exchanger and other components of the refinery under high temperature condition.
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