EE HAD OPENED A PORT ON THE PREHEATER TOWERE TO CHECK FOR BUILD UP IN SIDE OF MACHINERY. HE WAS STARTING TO BECOME BLOCKED. AN AIR CONNER NEED THE OPENING WAS DISCHARGED IN AN ATEMPT TO REMOVE BUILT UP MATERIAL. THE HOT MATERIAL LOOSENED BYTHE AIR CONNEN WAS FLUSHED OUT OF THE HOLE ONTO THE EE S WRIST AND CAUSING SECOND DEGREE BURNS. EE WAS WEARING HIS PPE AT THE TIME OF THE ACCIDE