Reasons for the low pressure decomposition temperature in the ammonia stripping process
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The temperature in the high-pressure stripping tower remains stable within the range of 205–206°C, but the temperature in the medium-pressure decomposer can only reach 149–150°C. The medium-pressure steam supply valve located in the steam condensate line at the bottom of the medium-pressure decomposer is kept fully open, which allows the decomposition temperature to reach 152–153°C (with the pressure of the pressurized steam at the upper part of the medium-pressure decomposer being 550–258 KPa, and the pressure of the steam condensate at the lower part being 1.78 MPa). As a result, the decomposition rate of medium-pressure ammonium methoxide decreases, and the load on the subsequent system for decomposition and recovery increases. I would like to ask the experts how improvements can be made through process control optimization and equipment maintenance to raise the temperature in the medium-pressure decomposer.
Reasons for the low medium-pressure decomposition temperature: 1. High opening degree of PV9207 or liquid in the vapor phase of V-01 (there are several possible causes); 2. Inert gases present in the steam; 3. False readings from instruments such as temperature sensors or level gauges; 4. Increased leakage through the partition between E_02A/B. It is recommended to use the elimination method to determine the cause one by one