Stirring side line temperature
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Our stripping unit uses a single tower with ammonia extraction via a side stream. I’ve heard that the temperature at which ammonia is extracted from the side stream should be kept around 150 degrees. Is this reasonable? Why is this temperature range chosen, and what is the basis for it? If you know, please let me know. Thank you
This is mainly related to the production process of the equipment; it involves the parameters of a single tower. The main purpose is to separate acidic gases from crude ammonia gas, reduce the amount of sulfides in the ammonia gas, and prevent crystallization.
When the temperature is below 150 degrees, the pipeline will contain acidic gases; at insufficient temperatures, hydrogen sulfide reacts with ammonia to form salts that can block the pipelines. When operating a single tower, it is essential to pay close attention to pressure and temperature levels in order to prevent salt formation! If it’s less than 150, don’t start the testing line!
This is also a matter of material balance and heat balance; the temperature at the bottom of the tower is 162 degrees, the side-stream extraction ratio is around 10%, and the ratio of cold to hot feed is about 1:5, which is why the temperature in the side stream is so high.