causes effects and removal of scale and sludge
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Answer:
So sudden high-pressure is developed, which may even cause explosion of the boiler. Removal of scales : (i) With the help of scraper or piece of wood or wire brush, if they are loosely adhering. (ii) By giving thermal shocks (i.e., heating the boiler and then suddenly cooling with cold water), if they are brittle.
Answer:
Disadvantages of Scale & Sludge Formation 1. Decrease in Efficiency of Boiler : The excessive scale formation may cause clogging of boiler tubes which decreases the efficiency of the boiler. 2. Wastage of Fuel : Scale is a poor conductor of heat. This results in the reduced rate of heat transfer, and thus the evaporative capacity of the boiler will be reduced.
the main cause of scales in high-pressure boilers. Calcium sulphate scale is quite adherent and difficult to remove even with the help of hammer and chisel. (1) Hydrolysis of magnesium salts : Dissolved magnesium salts undergo hydrolysis (at prevailing high temperature inside the boilers) footing magnesium hydroxide precipitate, which forms a soft type of scale e.g