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The purpose of a power boiler is to create steam by applying heat energy to water. The water supply to the boiler, which is converted to steam, is called "feed water". This feed water system removes any impurities in the condensate, which is steam converted back to water, preheats and pressurizes it, then returns it to the power boiler steam drum. The power boiler control system maintains the proper flow of feed water to the boiler. As the hot combustion gases pass from the furnace through the generating tube bank, steam is formed in the tubes and rises to the steam drum.
The steam system is the path that the water entering the boiler steam drum follows until it passes through the main steam stop as high-pressure and temperature steam. The power boiler control system maintains the correct flow of steam at the proper pressure and temperature.