High and low pressure falling film evaporators
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The unit is a falling film evaporator; the high-temperature and high-pressure vapor from the top of the tower flows through the shell side, while the low-temperature and low-pressure liquid from the bottom of the tower passes through the tube side via a forced reboiler pump. It is equipped with a stainless steel liquid distributor. During the current inspection, it was found that a large amount of material had polymerized at the liquid distributor; almost the entire upper head was covered with polymers. Could some experienced colleagues analyze this situation and suggest ways to deal with it or prevent such issues from occurring? The amount of inhibition of polymerization inside the tower is normal.
Is your system using the vapor at the top of the tower as the heat medium?
Is the heat medium steam, and is it located near the steam inlet, causing polymerization due to local overheating?