Cause of clinker formation low GCV,Overfiring,Ash fusion,Mineral contentl,Primary secondary air ratio not proper,outage of soot blower clinker Grinder

Clinker Formation is due to Low GCV of coal,Mineral Content in coal,overfiring,ash fusion but accumulation in Water Wall may be Checked by Poking and Providing sufficient water into hopper for flushing,soot blowing,using clinker grinder and proper firing by proper primary secondary air ratio.


Cause of Clinker formation is high ash content,low GCV and high mineral content in coal but precaution is solution
In India Coal used in Power Plant is of often low quality which has high ash content and low GCV.Mineral content present in coal may increase this problem.In Water Wall ash is fused and stick on it.Presence of minerals content in coal produce very hard lumps of clinker which are very difficult to remove.Such clinkers are removed by pneumatic hammer during shutdown of unit.


To avoid clinker formation we must use good quality of coal which has less ash having high fusion temperature,more GCV and less mineral content in it.soot blowing and clinker grinder must be taken into service.Primary and secondary air ratio must be proper.Overfiring must be avoided.sufficient water must be used to flush slag from boiler hopper.Poking must be continous so that accumulation may be avoided.


If the quality of coal is low then it is not possible to stop clinker formation but we can stop its accumulation in furnace to some extent by proper poking at ash hoppers and providing sufficient amount of water which may flush out fused slag.Precaution is key which may reduce down time of unit.



We must not blame coal quality for clinker formation but our vigilant attitude may stop its accumulation in Furnace.


Always keep watch on regular poking.


Provide sufficient amount of water in hopper which may flush out fused slag.


Firing in Boiler must be proper so there may not be unburnt coal by using right proportion of primary and secondary air.



Fuel oil burners must be properly so there may not be unburnt oil in furnace.Fuel oil firing must be proper.Fuel oil must be properly atomized and steam must be properly charged into oil gun.



Above precaution may avoid chances of clinker formation and its deposition which may result into higher plant load factor.


For national interest we must check fuel firing to avoid unburnt fuel.



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