Dear  Mihail

Couldnt avoid being curious to get your sense about bypass. This sounds that your intensive experience would favour us to get intensified benchmark with considerable foundation. My view is , i  havnt heard of  bypass b/w the preheater and kiln or perhabs it may be my lack of knowledge.

1) As spelled by you bypass may avoid alkalies being recycling of thereoff offsetting the chances of coating in Fan . Objectively what it does to make the system stay off the culprit of coating . Presumable as per our knowledge we gives the blast air to ID impeller to remove coating problem. But if thereis seperate concept like you highlighted , that would really be a constructive action to cope with this problemistic situation.

Looking your furthur reply

Thanks in anticipation

RAHUL  

We have the same problem as our raw materials are high in sulfur and we are now burning petcoke with 6% sulphur. However we have been using a method for some years which allows us to solve the problem in 1 hour.

Stop the kiln and IMEDIATLY open the Fan door and wash with cold water - use a (hose). The thermal shock will cause the build-up to SNAP rigth off the blades. Some people will try to convince you that the thermal shock will damage / deform the impeller - not true, we do this operation every month and the fan is always balanced.

Dear Mr.MFM,

Your reply support my answer which,I have already replied for the same query of Mr.YRK.My reply was as given under:

 "Most proven way to reduce ID fan vibration is to maintain the PH exit gas temperature about 200 deg.cent by water spraying in downcomer duct.If you are not able to control PH exit gas temperature around 200 degree cent. then best countermeasure is, whenever opportunity comes, clean the PH fan coating by "High Pressure water jet pump",you may clean the coating in less than 1 hour by the method.

" Regards,

R.M.Sahu

Hello....have you considered using a air blaster to remove build up formation ?

 thanks

thomas

www.staminair.com