Is the time it takes for the flue gas to reach saturation temperature during desulfurization related to the inlet temperature?
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Is the time it takes to reach saturation temperature during flue gas desulfurization related to the inlet temperature of the desulfurization tower?
During flue gas desulfurization, as the flue gas enters the absorption tower, its temperature drops to the saturation temperature of the flue gas right at the tower’s inlet. This change occurs in a very short time and is quite sudden; therefore, the inlet of the absorption tower needs to be lined with an alloy to prevent deformation caused by such drastic temperature changes
It is related; when the pressure remains constant, the higher the temperature, the more water vapor can be present in the saturated state, and the opposite is true at lower temperatures. At a higher flue gas temperature at the inlet of the desulfurization tower, more water vapor must be absorbed to reach saturation compared to when the temperature is lower.
What does it matter? As long as there is liquid water present, saturation is achieved instantly
Theoretically, there is a gas-liquid phase equilibrium at the top tray, and the saturation temperature at the flue gas outlet is consistent with the temperature of the desulfurization liquid entering the tower
The saturation temperature after desulfurization is related to the temperature of the flue gas, but the relationship is not very strong. A simulation using ASPEN makes it clear that the temperature of the flue gas has little effect on the exhaust gas temperature, but there is indeed an impact; generally, when the flue gas temperature rises by 20°C, the exhaust gas temperature rises by less than 1°C (this applies only to the wet process; it does not apply to the semi-dry and dry processes). In fact, it is the temperature of the circulating fluid and the water content in the raw flue gas that have a significant impact on the flue gas exhaust temperature.