In urea produnittion,the operation of high-pressure equipment is related to the safety and stability of the urea system.The intermediate product of urea,methyl ammonium,has strong corrosive properties,leads to the corrosion of high-pressure equipment lining is most serious in the top lining of the synthesis tower.On the one hand,this is the gas-liquid two-phase contact surface,and the perturbation is intense,which accelerates the impact of the medium on the lining;on the other hand,when start-up,this place is very prone to the phenomenon of over-temperature,which aggravates the corrosion.This paper mainly analyzes the reasons for over-temperature at the top of the synthetic tower when start-up,points out the treatments taken and the results achieved.
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