What impact can trace amounts of fresh gas added to the synthesis tower have on it?
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What other effects are there besides poisoning the catalyst?
Catalyst activity declines, the ammonia content at the tower outlet decreases, system pressure rises, and the system’s production capacity is reduced. If there is a high level of CO2 in small amounts, it can also cause blockages in the system’s pipes and equipment, increasing the pressure difference within the system; in severe cases, this can lead to the shutdown of the entire system.
This post was last edited by 654262293 on 2010-8-29 at 16:52. The catalyst activity declines, the temperature of the catalyst bed drops or even falls below the optimal level, the system pressure rises, and the ammonia production decreases; in severe cases, this can lead to a reduction in the operation of the synthesis system or even an interruption in its operation.
Catalyst poisoning may occur, leading to poor reaction performance, increased pressure, reduced yield, and lower temperature. It is not conducive to the reaction.
Reply to 3# 654262293: Is it likely that carbon ammonium will be formed?
If the water content is high, it will cause the synthetic catalyst to break down, leading to an increase in bed pressure drop and a reduction in reaction activity.
There is a possibility of carbon ammonium formation; for example, if there is a leak in the heat exchanger, unmethanized CO2 enters the synthesis tower and reacts with ammonia to form carbon ammonium. This leads to an increase in resistance, preventing an increase in load – any attempt to increase the load results in a sharp rise in pressure within the synthesis tower.
Trace amounts generally refer to the concentration of carbon monoxide and carbon dioxide; carbon monoxide can cause catalyst poisoning and a decrease in its activity, leading to temperature differences across the furnace； Carbon dioxide can cause the system to gradually become clogged, leading to increased resistance; in severe cases, it becomes impossible to apply load, and the system experiences high pressure, requiring shutdown for thermal cleaning.