What is the reason for the high ammonia content in the gas entering the synthesis tower? How should it be handled?

The high ammonia content in the imported material is mainly due to the following reasons: 1. The ammonia cooling temperature is too high, which is caused by factors such as high pressure of gaseous ammonia, low pressure of the incoming ammonia, poor heat exchange efficiency of the ammonia cooler, and high temperature of the incoming ammonia. 2. The separation efficiency of the separator is too poor. 3. There are internal leaks in the equipment, such as air leakage in the shell and tube sides of the cold exchanger or heat exchanger. 4. The outlet temperature of the water cooler is too high, and the load on the ammonia cooler is excessive.

1. It is caused by a high temperature in the ammonia cooler. The reasons for the high ammonia cooling temperature include: an excessively high or low liquid level in the ammonia cooler, a low load on the ammonia chiller, a small flow rate of water in the water cooler at the outlet of the ammonia chiller, or a low pressure of the circulating water. 2. The liquid level in the separator is too high, causing the recycle gas to contain ammonia. 3. Poor cooling performance of the water cooler (low flow rate of circulating water, low pressure of circulating water, or poor heat exchange due to scaling in the water cooler)

Reasons for the high ammonia content in the gas entering the synthesis tower: 1. Leakage in the heat exchange section of the cold exchanger, causing the gas with high ammonia content inside the tubes to mix into the gas that goes to the synthesis tower after ammonia separation. 2. The ammonia separator section of the cold exchanger is damaged, or oil contamination causes low ammonia separation efficiency; furthermore, excessive liquid level control results in gas carrying liquid ammonia, thereby increasing the ammonia content in the gas entering the synthesis tower. 3. The high ammonia condensation temperature hinders the conversion of gaseous ammonia into liquid ammonia, resulting in an increase in the concentration of gaseous ammonia in the gas entering the synthesis tower. Treatment method 1. Inspect the cold exchanger. 2. Strengthen oil drainage from the cold exchanger; stop the machine for thermal cleaning if necessary. 3. Lower the ammonia condensation temperature.

High temperature of ammonia cooler, high temperature of water cooler, poor performance of ammonia separator