In the ammonia refining system of a petrochemical company,a leak occurred in the ammonia condenser.After analysis,it was found that the leak was caused by corrosion on the circulating water side.To this end,the paper provides a detailed description of how low circulating water velocity leads to fouling on the condenser tube bundle,which in turn forms an oxygen concentration cell and initiates electrochemical corrosion.Additionally,other potential corrosion factors such as microbial corrosion and improper operation are analyzed and discussed.To prevent tube bundle leaks,measures have been proposed,including controlling the circulating water velocity to no less than 1 m/s,strictly monitoring and controlling the quality indicators of the circulating water,adding crossover lines in the ammonia condenser to improve water flow distribution uniformity,upgrading the material quality of the condenser tube bundle to enhance its corrosion resistance,and conducting regular backwashing to remove fouling and microorganisms from the tube bundle.
维普
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