What causes the rise in the liquid level in the ammonia recovery reflux tank?

The rising liquid level in the reflux drum of the ammonia stripper may be attributed to the following reasons: 1. A decrease in the cooling efficiency of the condenser or its blockage, resulting in an increase in the temperature of the reflux liquid and consequently a rise in the liquid level within the reflux drum. 2. The flow rate of the reflux pump increased abnormally, causing the liquid level in the reflux drum to rise. It may be caused by issues such as a malfunctioning return pump or abnormally open valves. 3. Change in tower top temperature. As the top temperature of the tower decreases, the amount of liquid that condenses at the top of the tower decreases, which in turn increases the amount of reflux liquid in the reflux tank and causes the liquid level in that tank to rise. Regarding the second issue, an increase in the top temperature of the ammonia stripper leads to a rise in the liquid level in the reflux drum. Because as the temperature at the top of the tower rises, the amount of gas produced increases, which reduces the amount of cooling liquid passing through the condenser. As a result, the volume of liquid in the reflux tank decreases, leading to an increase in the liquid level. I hope this can be helpful to you! .

The temperature is high, so the liquid level rises; more water is carried upward

Won’t a decrease in the reflux liquid inside the reflux tank lead to a lower liquid level? How can the liquid level rise? Please explain the principle so I can learn it. Does the amount of vaporization in the reflux tank increase as the temperature rises? The flow control valve for the reflux pump is manually operated. The traffic volume is constant. The top-head pressure fluctuated significantly, causing the temperature at the top of the tower to rise from 125°C to 128°C. This led to a rise in the liquid level. Eventually, it became necessary to operate both pumps simultaneously; however, even with both pumps running, the liquid level only decreased slowly. Due to the large pressure fluctuations, the temperature dropped to 123°C, but the liquid level didn’t decrease much as a result. So I was suddenly confused and didn’t know about the relationship between temperature

Is this amount of flashing fixed?

A decrease in the reflux liquid inside the reflux tank leads to a drop in the liquid level. My previous answer was incorrect; I am very sorry for that. Returning to your question: Does the amount of vaporization in the reflux tank increase as the temperature rises? The amount of flash evaporation is primarily influenced by the pressure and temperature within the reflux tank; as these values increase, the molecular movement within the liquid speeds up, making it easier for the liquid to transform into a gaseous state at the surface, and to be sent to downstream equipment through the flash vent pipes. Therefore, overall, as the temperature in the reflux tank rises, the amount of flashing increases. However, other factors also need to be considered, such as the flow rate, liquid level, pressure, and so on of the reflux liquid. .

Okay, thank you for your answer. Theoretically, as pressure increases, temperature also rises; an increase in temperature leads to an increase in the amount of vaporization, and as a result, the liquid level in the reflux tank decreases due to this increased vaporization, causing a drop in the liquid level. Can I interpret it this way? But in my case, the temperature rose, and so did the liquid level; when the temperature dropped, the liquid level also decreased accordingly. This forces the use of two pumps. Otherwise, the liquid level will reach the gas phase pipeline.

When the tower top temperature is high, flash evaporation within the tower increases; this leads to a greater amount of water being carried away by the vapor. The reflux liquid in the reflux drum is also carried out, causing the liquid level in the reflux drum to rise. When this level becomes too high, there is less space available for flash evaporation inside the drum, which in turn causes the flash evaporation rate to decrease. This results in the liquid level continuing to rise.

Thank you, this problem has been solved. Many thanks

In the ammonia stripping tower, when the top temperature rises, the liquid level in the reflux tank generally decreases. The reason is that an increase in the top temperature usually indicates an increased heat load on the ammonia extraction process, which may be caused by factors such as an increase in feed volume or changes in the reactants. In this case, the amount of liquid returning to the tower does not increase, resulting in a drop in the liquid level ； Meanwhile, the rise in tower top temperature also leads to an increase in the amount of flash vaporization, ultimately resulting in greater evaporation of the liquid in the reflux drum; this is another reason for the decrease in liquid level. Therefore, what your operator said, namely \"the tower top temperature decreases and the liquid level in the reflux tank drops,\" is incorrect. In the ammonia stripping tower, an increase in the top temperature usually leads to a decrease in the liquid level in the reflux tank