Comparison of advantages and disadvantages of fans before and after the drying tower
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As the title suggests, this is just a tentative suggestion; I hope everyone will share their own thoughts. Let me share my thoughts first. 1. The materials used for the impellers of fans located at the front of the tower can be of lower quality compared to those used in fans located at the back of the tower, which also results in lower costs. 2. Fans at the back of the tower make use of more compressive energy; the compressive energy generated at the front of the tower is lost once it reaches the drying tower, whereas fans at the back can increase the inlet air temperature and thus make use of more heat
I don’t seem to agree with the first reason given by the original poster; un dried flue gas is much more corrosive than it is after being dried. Therefore, fans located in front of the drying tower require impeller materials of higher quality. Sorry, I didn’t pay close attention; it’s sulfur used to produce acid. This post was last edited by Also a Chemical Engineer on 2009-3-22 22:18]
There are relevant discussions in this section regarding the location of the main fan in sulfuric acid production plants: http://bbs.hcbbs.com/viewthread.php?tid=81649
In the production of sulfuric acid using sulfur, there is a distinction between the section before and after the tower, and this has little impact on the fans. In fact, the section after the tower not only provides protection for the fans but also enables better utilization of thermal energy； I’ve never heard of using pyrite to produce acid; fans are used in front of the drying tower, and attention must also be paid to the drying effect behind the tower.
1. The impeller of the fan located before the drying tower is not subject to acid mist corrosion, which means its service life will be longer. However, this fan consumes more energy, and the compressed air produced by it can increase the acid temperature in the drying tower. 2. The impeller of the fan located after the drying tower is exposed to acid mist and acidic sludge, leading to corrosion. Yet this fan uses less energy, and the compressed air it produces can be used to raise the temperature in the sulfur combustion furnace
So it was already discussed before. . . Thank you very much for sharing.