Question

formed in boilers are poor conductor of heat.
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Answer 1

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Answer 2

Answer:

Sludges tend to lose some of the heat produced because they are poor heat conductors.

Explanation:

If scales and sludges both develop at the same time, the former is encased in the latter and both are deposited as scales. The boiler's operation is disrupted by excessive sludge buildup.

• Formation of Scale- When water, steam inside boilers. As it flies, the substances present in it get deposited on the walls of the boilers, and in some time a thick crust is formed, this is called the boiler scale. The crust is a bad conductor of heat. Hence, it reduces the ability of water to evaporate.
• As a result of the constant evaporation of water in boilers, the concentration of dissolved salts gradually rises. They are expelled from water in the form of precipitates on the inner boiler walls when their concentrations exceed saturation. Sludge is the term used to describe precipitation that is loose and slimy in consistency. Scale, on the other hand, is what happens when the precipitated material coats the interior walls of the boiler in a hard, adherent crust.
• Sludge is a mushy, sticky, greasy precipitate that occurs in the boiler's somewhat cooler sections and gathers in places where the flow rate is extremely slow or at bends. Sludge is made up of substances, such as MgCO3, MgCl2, CaCl2, MgSO4, etc., that are more highly soluble than even in cold water.

hence Due to their low heat conductivity, sludges frequently lose some of the heat generated.