Investigation on the acid temperature and flow rate at the inlet of the dry absorption tower
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Let’s discuss the acid temperature and volume at the inlet of the dry scrubber! ! !
The temperature of the acid entering our plant’s tower is 65 degrees; as for the amount of acid entering the tower, I didn’t pay attention to it at that time
For acid absorption, it’s around 80 degrees at the first stage, around 70 degrees at the second stage; drying takes place at 60 degrees. Sulfur is used to produce acid, and this is part of the process after the tower.
We do not have a fixed value; it varies with temperature (20–60°C). From a drying theory perspective, stable low temperatures yield better gas drying results. But the adjustments are mainly made based on whether the acid mist and moisture levels at the fan outlet meet the specified standards.
In China, due to the design of the acid separator, many dry absorption towers operate with large amounts of acid, which actually compensates for the limitations of the acid separator’s performance. One drawback of operating with high acid levels is that the operational costs are relatively high. However, the performance of the acid separator is directly related to the amount of acid mist generated; the problem of excessive acid mist often arises, yet people rarely consider the acid separator as the cause.
The temperature entering the tower is 65–70, and the spray density is 18 cubic meters per hour
6# True men from northern Shandong: In our drying towers, the temperature of the acid entering the tower is generally kept between 50-60 degrees. Recently, due to issues with the heat exchange efficiency of the acid cooler, the temperature of the acid used for drying has not been able to drop below 64 degrees; sometimes the moisture content exceeds the allowed limits. The temperature of the acid entering the first absorption tower should be around 70 degrees, while it should be around 65 degrees in the second absorption tower. These temperatures can be considered reasonable.
In our drying tower, the temperature of the acid entering the tower is generally kept between 50 and 65 degrees; the flow rate of the circulating acid is 520 cubic meters per hour. In the second absorption tower, the temperature is maintained around 60-75 degrees, with a circulating acid flow rate of 430 cubic meters per hour. Specifically, it must also be controlled based on ambient temperature and humidity. Generally, a higher circulation rate results in higher power consumption, while a lower circulation rate leads to a lower temperature of the dried air and a higher concentration of exhaust gases at the second absorption stage
We keep the temperature in the drying tower around 40 degrees, while for the acid temperature in the absorption tower, we ensure it is not lower than the temperature of the gas entering the tower minus 100 degrees
We have three towers and one tank; the acid temperatures are 60, 70, and 80 degrees. The rated flow rate of each of the three acid pumps is 360 cubic meters per hour, with the pumps operating at full load.
I think the lower the dry acid temperature, the better, but factors such as equipment need to be taken into account; 45–60 is a good range