Why is it necessary to maintain a high pressure of gaseous ammonia during the initial stage of temperature rise and reduction for the synthetic catalyst?
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Why is it necessary to maintain a high pressure of gaseous ammonia during the initial stage of temperature rise and reduction for the synthetic catalyst?
In the early stage of catalyst reduction, the water separated out contains little to no ammonia; as a result, its freezing point is high. To prevent freezing and damage to the pipes, the pressure of gaseous ammonia must be kept high, thereby preventing freezing in the ammonia cooler.
It is mainly to prevent the temperature of the ammonia cooler from dropping too low. Too low a level can cause the system to become clogged by condensed water.
Lower the freezing point of the reduced water, preventing it from freezing due to the extremely low temperature caused by ammonia cooling and thus avoiding blockages in the pipes
(It lowers the freezing point of the water produced through reduction, preventing the water from freezing due to the extremely low temperature caused by ammonia cooling, which could otherwise cause blockages in the pipes). The water produced through reduction comes mainly from the ammonia separator.
The main purpose is to keep the temperature of the ammonia cooler from dropping too low, as during the startup reduction process water is present in large quantities; too low a temperature can cause the water to freeze, thereby blocking the system with condensed water.