Sulfur recovery acid water vaporizer
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What are the main reasons for the frequent blockages in the gas line at the top of the acid water reflux tank in the acid water stripping tower? Is there any good way?
It should be caused by ammonium salt crystals. Is the heat tracing in good condition?
There are several methods: 1. External heating; 2. Periodic steam injection; 3. The vapor phase line usually includes a wire mesh demister – reduce the mesh size and check whether the mesh is damaged or clogged; 4. Improve ammonia removal during the acid water stripping process, for example by adding alkali for neutralization or increasing the temperature of the heavy waste at the bottom of the tower
Agree with the view from the 3rd floor. The temperature of the acidic gas coming out of the top of the acidic water stripping tower after cooling also needs to be controlled; too low a temperature is not acceptable either.
External heat tracing is available; the temperature at the top of the tower is 120 degrees, and it drops to over 100 degrees after cooling. What is the crystallization temperature for ammonium salts, and which type of ammonium salt is it?
After air cooling, we keep the temperature at 85–90°C; if it’s too high, water in vapor form will enter the back path. In your case, it is necessary to analyze the condition of the raw materials or the efficiency of distillation in the stripping tower
The design temperature at the top of the tower is over 120 degrees
It might be due to ammonia being carried in after the temperature drops; there could also be issues with the heating system, with the main problem being that the ammoxidation tower fails to remove ammonia thoroughly. Personal opinion
This post was last edited by notemper on 2018-3-21 at 21:45. It is likely caused by crystallization; in addition to strengthening the heat tracing, a purging line should be added. It is also necessary to regularly rebuild the reflux.
Pipeline blockages are likely caused by an excess of ammonia, which forms ammonium salts together with hydrogen sulfide and carbon dioxide. Heat tracing is a crucial element; the problem mainly lies in the gas phase coming out of the distillation process. It’s important to control the temperature at the top of the tower, and it would be best to test the raw materials used in your plant to determine whether the ammonia content exceeds the capacity of the installation to handle it