Experimental Study on Boiler Scales Cleaning Using Hydrochloric and Citric Acids


The effect of hydrochloric acid and citric acid was studied experimentally forboiler chemical cleaning to determine the dissolved scale by using carbon steelsamples of water-side boiler tubes sections ,different concentrations of hydrochloricacid HCL and citric acid were used(2%,3%,4% and 5%) to calculate the weight loss of samples then determined thedissolved scale in gm/m2. The more efficient acid for the chemical cleaning, wasfound to be HCL acid at 5% concentration by using 0.3% rodin inhibitor at temp.60 and time 30 minute to obtain 248 gm/m2 of dissolved scale while the citricacid at 5% concentration by using 0.3% hexamine inhibitor and temp.70 andtime 240 minute to obtain 168 gm/m2 of scale dissolved.