Catalyst reduction in the first layer of the synthesis tower......
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Please share your thoughts or suggestions on how to reduce the temperature after replacing the first layer of catalyst in the synthesis tower. The synthesis tower is of the Cassali type, featuring 3 beds, 1 cold shock unit, and 1 internal heat exchanger, with ammonia separation taking place after the tower.
(1) Strictly control the temperature of the first catalyst bed to prevent high water vapor concentrations from having an adverse effect on the activity of the catalysts in the lower layers (Note: Since what was mentioned is only the replacement of the catalyst in the first catalyst bed, the remaining catalysts can be considered to have been passivated, which is equivalent to pre-reducing them). (2) Strictly control the heating rate and adhere to the principle of \"no pressure increase during heating, and further heating when pressure is increased\" during the reduction process. (3) Put the ammonia cooler into use at the appropriate time, but care must be taken to prevent freezing; therefore, it is best to analyze the concentration of the ammonia solution.
It is recommended that pre-reduced catalysts be used when replacing the catalyst only partially.