What are the consequences of too low medium pressure? (Aqueous solution)

Increasing the opening degree of the medium-pressure pressure control valve leads to an excessive amount of split flow, which hinders the absorption of ammonia by the scrubber; moreover, it increases the amount of gas vented through the tail suction, thereby raising ammonia consumption.

Why is the per-second decomposition too large?

The most severe consequence: the ammonia booster pump will vaporize, and if the high-pressure ammonia pump is a centrifugal pump, it will shut down.

Consequences of low medium-pressure: 1. The ammonium methylate solution tends to vaporize, and the ammonium methylate pump may fail to operate. 2. If the pressure drops too low, it may also cause the liquid ammonia at the inlet of the liquid ammonia pump to vaporize, resulting in the pump not being able to operate. 3. If the medium-pressure is too low, the ammonia cooling effect at medium pressure decreases, increasing the washing load on the inert gas scrubber. At the same time, the load on the tail suction tower increases, leading to higher ammonia consumption, which may cause environmental pollution. 4. If the medium-pressure is too low, it can lead to liquid flooding in one of the absorption towers; in severe cases, this may result in an excessive level of CO2 in the gas exiting that tower, thereby causing crystallization and blockages in the ammonia cooling system. Worse still, it can cause blockages in the ammonia return pipe at the top and in the inlet pipe of the liquid ammonia pump, leading to a shutdown of the system for thermal cleaning. 5. If the medium-pressure is too low, the ammonia cooling effect at medium pressure decreases, which results in the need to add a large amount of fresh liquid ammonia. If the cooling effect of ammonia declines significantly, the amount of fresh liquid ammonia added will not be sufficient to meet the requirements, and the level in the liquid ammonia buffer tank will drop.

The setting of the medium-pressure parameters is primarily aimed at ensuring effective condensation and recovery of gaseous ammonia by the medium-pressure ammonia cooler. Clearly, if the pressure is low, the cooling efficiency of the ammonia cooler decreases, resulting in greater venting and increased consumption. The other results are as mentioned by the people above. Medium-pressure also affects the medium-pressure decomposition rate as well as the absorption efficiency of the absorption tower. If the pressure is too low, the absorption efficiency of the tower decreases, and the concentration of methamine solution drops, which in turn affects the conversion rate in the synthesis tower. If this situation is not addressed promptly, the operating conditions of both the synthesis tower and the absorption tower will deteriorate, resulting in increased ammonia consumption and reduced output. If nothing is done to address it, it can lead to a vicious cycle, causing chaos in the system and eventual shutdown. If there are occasional fluctuations and they are adjusted in a timely manner, it’s not a big problem.

Consequences of low medium-pressure: 1. The ammonium methylate solution tends to vaporize, and the ammonium methylate pump may fail to operate. 2. If the pressure drops too low, it may also cause the liquid ammonia at the inlet of the liquid ammonia pump to vaporize, resulting in the pump not being able to operate. 3. If the medium-pressure is too low, the ammonia cooling effect at medium pressure decreases, increasing the washing load on the inert gas scrubber. At the same time, the load on the tail suction tower increases, leading to higher ammonia consumption, which may cause environmental pollution. 4. If the medium-pressure is too low, it can lead to liquid flooding in one of the absorption towers; in severe cases, this may result in an excessive level of CO2 in the gas exiting that tower, thereby causing crystallization and blockages in the ammonia cooling system. Worse still, it can cause blockages in the ammonia return pipe at the top and in the inlet pipe of the liquid ammonia pump, leading to a shutdown of the system for thermal cleaning. 5. If the medium-pressure is too low, the ammonia cooling effect at medium pressure decreases, which results in the need to add a large amount of fresh liquid ammonia. If the cooling effect of ammonia declines significantly, the amount of fresh liquid ammonia added will not be sufficient to meet the requirements, and the level in the liquid ammonia buffer tank will drop.

When the medium-pressure pressure control valve is opened, the most direct consequence is an excessive amount of material being fed in, which causes the liquid level in the first absorption tower to rise instantly; if this is not controlled in time, it can lead to overheating in that tower.

Is there still a risk of static electricity generation at the vent valve?