Analyzing system corrosion prevention issues
Thread Content
This post was last edited by sby123 on 2012-4-18 at 20:39. The corrosion of the analysis system is severe; is it necessary to introduce anti-corrosion air, and how should the amount of such air be determined?
Explain the issues clearly: the load, composition, conditions of the tower, etc. Why is corrosion occurring? Won’t it corrode if oxygen is added?
The pipelines of the reflux liquid system are severely corroded; the original 304L material has been replaced with 316L. The stripping tower, hydrolysis tower, reflux condenser, and the liquid level tanks associated with the reflux condenser are all made of 316L. There is slight corrosion in the stripping tower, reflux condenser, and those liquid level tanks. Under normal operating conditions, the stripping load is between 28–30 cubic meters, with 24% ammonia and 25% carbon dioxide in the reflux liquid, at a temperature of 75°C. Oxygenation is also a measure, I guess.
If the parsing tower is made of 316L, it shouldn’t corrode, so there’s no need to introduce air.
Thermal insulation must be properly ensured; the gas exiting the desorption tower should flow steadily to avoid condensation-induced corrosion.
To address the corrosion issue in the processing system, it is crucial to control the materials of the equipment and pipelines. Whether it is equipment or pipelines, the material must undergo a crystal corrosion test. Only those that pass the tests can be used; there are too many fake materials nowadays.
The process air addition project is underway; regarding the exact amount to be added based on the load, I would appreciate your advice.
The material selection must be proper; high-grade stainless steel materials should be used. The main cause of corrosion is corrosion by methanamine solution, as ammonia, CO2, and H2O together create an environment conducive to the formation of methanamine solution. In some cases, 18-8 stainless steel is not suitable for use