What are the effects of different liquid levels in the desulfurization regeneration tower?
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What are the requirements for the liquid level in the desulfurization regeneration tower? How about adjusting it?
In tower equipment, the liquid level is usually controlled at around 50%, primarily by regulating the feed rate and the amount of lean liquid taken out from the bottom of the tower
We do not control the feed rate; instead, we control the liquid level by regulating the outlet flow of the lean liquid at the bottom of the tower.
If the liquid level control in the desulfurization regeneration tower is too high, the following symptoms occur: the inlet and outlet temperatures of the reboiler at the bottom of the tower increase, while the temperature at the top of the tower decreases. The reason is that the distillation section of the regeneration tower has been increased, which prevents the secondary steam from reaching the top of the tower effectively; as a result, it condenses in the middle part of the tower, causing the temperature at the top of the tower to drop. The liquid level is generally kept at 50-60%; if it exceeds 75%, the aforementioned phenomena occur. Level control is achieved through a level control valve located at the inlet to the tower.
If the liquid level at the bottom of the tower rises suddenly while the steam flow to the reboiler remains unchanged, the heat is absorbed by the increased amount of solvent, resulting in a decrease in the vapor phase throughout the tower and a drop in temperature.
For desulfurization regeneration towers, it depends on whether high-tank regeneration or spray regeneration is used. Our plant’s 4.3-meter coking system employs spray regeneration for desulfurization, with the liquid level being controlled by a level regulator. The 5.5-meter coking system uses high-tank regeneration, and the liquid level in its regeneration tower is regulated by the amount of regeneration air and the circulation rate of the solution. It is mainly used to regulate the overflow volume of sulfur foam.