Is it okay to emit room-temperature gas from chimneys?
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consult: The original design chimney emitted 150-degree flue gas. Now, due to the use of flue gas desulfurization, the flue gas temperature has dropped to 40 degrees, and it is still emitted from the main chimney (150 meters). Question: What problems will arise, such as how much impact will it have on the wind pressure of the fan? Have the anti-corrosion requirements for the chimney increased? How to deal with them? 3Q
If wet desulfurization is used, the temperature of the flue gas when it is discharged into the chimney is low. The biggest problems that need to be solved are: First, the temperature of the flue gas is low, and the draft capacity of the chimney is reduced, which will affect the diffusion range of the flue gas.； Second, the flue gas temperature drops and water mist is easily generated, just like the humid air discharged from the cooling tower. When the flue gas with a low temperature but higher than the surrounding environment is discharged from the chimney, the water vapor in the wet desulfurization flue gas will precipitate condensed water when it is cooled. The condensed water is very fine in the atmosphere and forms white water mist. ； Third, the wet flue gas from wet desulfurization may cause corrosion, so it is best to anti-corrosion the chimney.
Thanks for the reply upstairs. I also want to ask, does it have a big impact on the selection or operation of the fan?
With the temperature so low, this chimney may not be suitable, right? At a height of 150 meters, it is not easy to go higher. Had to increase the fan size. During operation, it is considered that the chimney must be anti-corrosion, and the fan must be anti-corrosion.
The waste heat of 150-degree flue gas can also be utilized. Although it is low-grade heat energy, the amount is quite large.