boiler incrustation, physical processes

boiler incrustation, physical processes defined in 1909 year

boiler incrustation, physical processes - boiler incrustation, Physical Processes;
boiler incrustation, physical processes - By heating the water to a high temperature, it is possible to purify it from all the sedimentary matters contained in it. These matters are decomposed and precipitated, and cannot adhere to the walls of the vessel containing them till the temperature of the water is lowered. The temperatures at which the calcareous matters are precipitated are the following: -

Carbonates of lime, between 176 ° and 248 ° F. (80 ° to 120 ° C.).

Sulphates of lime, between 284 ° and 302 ° F. (140 ° to 150 ° C.).

Chlorides of magnesium, between 212 ° and 257 ° F. (100 ° to 125 ° C.).

Chlorides of sodium, between 302 ° and 320 ° F. (150 ° to 160 ° C.).

When the water contains only carbonates of lime, it suffices to heat to a temperature of about 212 °F. (100 ° C.), which may easily be obtained from the exhaust steam of the engine, and with ordinary air-pressure. When the water contains sulphates of lime or chlorides of sodium or of magnesium, as sea-water, it must be raised to a higher temperature, which has to be obtained by heating under pressure. In this case, the steam must be taken from the boiler - a fact which proves obstructive to the general use of such apparatus.

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