Crystallization blockage in the pipeline before the condensation cooler after the ammonia evaporation tower
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Blockage often occurs before the condensation cooler after the ammonia evaporation tower. The main reason is that the ammonia gas contains acidic substances, which form ammonium salts with ammonia. When the temperature decreases, crystals precipitate and adhere to the pipelines, causing the pressure of the ammonia evaporation system to increase and affecting normal production.
The crystallization is very serious and it is recommended to add heat tracing.
Adding heat tracing is indeed effective, and we have indeed improved it in this way. However, the cooling capacity demand for the total condenser will increase. At the same time, subsequent equipment is also susceptible to impact.
This is why under normal circumstances, it is difficult for everyone to increase the concentration of evaporated ammonia water.
At what temperature does this happen?
Has the exact composition of the dirt sample been tested?
If acidic substances can reach the top of the tower, it is because the mist is entrained or the separation is not clean. The tower should be modified.
Adjust the pH before evaporating ammonia and replace the ammonium salt with free ammonia
This mainly depends on the ammonia concentration before you enter the condensing cooler. The higher the concentration, the easier it is to crystallize, which is why everyone controls the ammonia concentration at 10% and does not dare to increase it too high.
This crystalline product is mainly ammonium salt.