Excessive steam pressure in the ammonia vaporization tower
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In an ammonia vaporization tower that is heated by direct steam, what consequences can occur if the steam pressure is adjusted too high, resulting in an excessive amount of steam entering the tower?
If the direct steam flow is too high, and the cooling water flow in the top condenser is low, the tower pressure will increase, disrupting the distillation equilibrium in the ammonia vaporization tower. As a result, the concentration of the concentrated ammonia solution at the outlet will be low, and the wastewater will no longer meet the required standards. If the cooling water flow is set too high, the load on the ammonia vaporization tower increases, which is purely a waste.
Normally, it’s 120 Kg/t for ammonia water
Excessive heat input results in better quality of the ammonia-vapor wastewater, but due to insufficient capacity of the recondenser, the temperature of the ammonia vapor after recondensation becomes too high. Typically, 170 kg/t of residual ammonia water is used in the design.
A couple of days ago, our control room increased the steam flow for a long time; even the wastewater pump was filled with steam. The pressure and temperature inside the tower rise sharply; once the temperature drops, the pressure inside the tower becomes negative. At first, the team leader thought there was a problem with the instruments, so he called in the instrument technician, but the technician said there was no issue……