For kilns with grate coolers, the burner tip should be in the plane of the kiln nose  or slightly inside the kiln providing it does not suffer damage from falling clinker. The burner should normally be concentric with, and on the axis of, the kiln. Some operators prefer to hold the burner horizontal and even tilted into the load. Such orientation may result in reducing conditionsand should be avoided. Clinker produced under reducing conditions causes reduced cement strength and abnormal setting. It should be appreciated that both burner position and tip velocity are intimately related to hood aerodynamics and can not be considered in isolation

ILA