The material balance in CFB furnace is important for the performance of the boiler.The bed inventory consists of coal ash and desulfurizing agent.In order to design properly the boiler and auxiliary

the engineers need to know the ash formation characteristics. Generally

the most reliable method to get ash formation data of a coal is to burn it in the real industrial CFB boiler. Due to the high cost and difficulties in sampling in such a test

people have to present other simple method on ash formation.The present investigation is proposing a simple laboratory test procedure to study ash formation by static combustion and sieving.Validation of the method is given.