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Why the sand dryer is corroded? It is known to all when the dryer shell is corroded, it will cause great losses, not only affect the exterior, also can cause the normal work of the equipment! When you find out the reason of the corrossion and prevent it, it can avoid the occurrence of these situations, and will save a lot of damage. If you look at the following matters, you won't be in trouble for it:
First, because corrosion has gone partly for 3 mm thick plate, the wet material accumulation at the bottom of the shell, not only reduces the material drying effect, but also causes the wet material inside the cylinder uneven distribution of flow, therefore at the discharging end to form hanging during material advancing, which is also a big reason for formation of local corrosion. one of the reasons for severe corrosion.
Second, because of external thermal insulation has been used more than 9 years of time, the heat preservation effect has been reduced, causing the material temperature is relatively low near the wall of shell, possiblly local corrosion has arised, is also one of the reasons for severe corrosion.at dryer cylinder, feed plate and support plate near the wall.
Third, on the dryer internal alkaline cleaning, due to the alkali (soda ash and deionized water) in certain Cl -, the damage to the stainless steel material have some. At present, after analysis of lye, alkali liquor in the Cl - content is 5 mg/L, than the national standard of the requirement of no more than 25 mg/L lower, but in the process more unknown factors in the production process. And combined with a variety of corrosion factors exist, so the existence of Cl - to accelerate the corrosion of 316 l material.