System Background In the concentrator section of phosphoric acid plant, weak phosphoric acid is concentrated by evaporation in graphite made evaporator. This is normally operated under vacuum & ~88°C temperature due to highly corrosive nature of phosphoric acid (PA). Over a period of time, the tubes of this exchanger require cleaning for removal of deposits & fouling material. This is a normal practice in both plants i.e. PAP-I & PAP-II.

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