Multiple Effect Evaporator Troubleshooting

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Hi all, We have four effect TVR based multiple evaporator in our plant. we are facing some issue recentily at our plant solid concentration decreasing in first effect than the feed concentration and the first calandria temperature reducing slowly and the temperature not increasing after increasing the steam pressure. could you some can provide some idea to way out.   

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2 Answers

  1. In a multiple-effect evaporator, water is boiled in a sequence of vessels, each held at a lower pressure than the last. Because the boiling temperature of water decreases as pressure decreases, the vapor boiled off in one vessel can be used to heat the next, and only the first vessel (at the highest pressure) requires an external source of heat, you can raised the heat by increasing the steam pressure and reduced the vacuum. Definitely you will get required concentration.