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The pre-heated feed water (through condensor) is fed into the first column where 33% of feed water is converted into steam under pressure by outside boiler steam. The pure steam produced in the first column having temperature of 135'c and the remaining feed water goes to the 2nd column. The pure steam is used as a heating media in the 2nd column and converts part of remaining feed water into steam. In the process the steam itself condenses back into water. This process is repeated till the last coulms each working at low temperature & pressure as compared to the one before it. The steam produced in the last column is condensed in the condensor by feed water as well as cooling water. As external heat is required only to convert the 33% of feed water, the heating energy required is reduced by 67%.
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