Acidic water vapor stripping – Why can’t the temperatures in stage 1 and stage 2 be reduced? How to improve?
Thread Content
Currently, for the acidic water stripping, the temperature is 142 for stage one and 120 for stage two, which is a bit high. At the beginning of operation, both temperatures could be kept at 130 and 90, but now they cannot be controlled. What are the reasons for this? How can the operation be improved to bring these two temperatures under control?
1. The amount of material drawn from the side stream is too high; check whether the tower pressure and temperature are normal, and also verify whether the ammonia nitrogen content in the acidic water fed into the tower is too high. If the temperature of the side stream cannot be reduced, it may lead to a dead loop. Check whether the output of liquid ammonia has decreased or if no liquid ammonia is being produced at all. Increase the temperature of the ammonia purification tower slightly, and try to keep the liquid level stable. 2. Check whether the temperature at the outlet of the side stream is too high; if it’s normal, consider the issue with the first-stage cooler in the side stream system. 3. It’s also possible that the ammonia nitrogen content in the acidic water is low, resulting in too much water being drawn from the side stream, which prevents effective cooling in both the first and second stages. In this case, comparing the volume of crude ammonia gas with normal levels can help identify the problem. There may be other possibilities as well, but these are the most common issues encountered
Floor 3 provides a detailed explanation; by referring to the production process, it is possible to conduct a thorough review of the processes, equipment, operational factors, as well as any external factors that might cause temperature increases, so that appropriate measures can be taken.