Thoughts on high-pressure washers
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Our plant’s urea production unit is a CO2-stripped urea plant, equipped with a dehydrogenation unit before the CO2 compressor, and a packing section inside the high-pressure washer. The temperature of the adjusted water entering the high-pressure washer is 80 degrees (provisional), while the temperature of the adjusted water exiting the high-pressure washer is 90 degrees (provisional). Question: ① What are the approximate concentrations of NH3 and CO2 in the liquid output from the high-pressure washer? ②What is the crystallization temperature of the methylammonium solution at this concentration? ③The temperature of the water discharged from the high-pressure washer is 90 degrees. During normal operation, is there any risk of crystallization inside the high-pressure washer?
1. The ammonia and carbon dioxide contents in the methylammonium solution are both around 40%. 2. At this concentration, the crystallization temperature is 120 degrees. 3. The temperature of the water used for temperature adjustment should be higher than 90 degrees; it’s roughly 110 degrees. Crystallization does not occur under normal production conditions, but it happens more often during shutdowns. For reference only