Reasons for the increase in the condensate in the evaporation two-stage separator
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Our facility currently uses a water-based fully circulating urea production process with an annual output of 150,000 tons. The evaporation two-stage separator has been replaced with a separator that employs ammonia stripping technology; during more than a year of operation, it was found that severe crystallization of polymers occurs in this equipment. Please analyze the reasons for this phenomenon.
Primarily, evaporated vapor carries urea droplets, which then adhere to the inner wall of the separation space. Meanwhile, due to being exposed to high temperatures for an extended period, biuret is formed; the accumulation of this biuret over time blocks the separation space. A temporary solution can be to use regular rinsing.