The “Bailong” problem in wet flue gas desulfurization
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How to address the “Bailong” issue in wet flue gas desulfurization? How to eliminate the “White Dragon”? Additionally, if ammonia-based desulfurization is used, is there a “Bai Long”?
Our device has the same problem as well
I’ve seen the problem of flue gas turning blue when ammonia is used for desulfurization and denitration...
The white dragon phenomenon is caused by the moisture carried in the flue gas; after wet flue gas desulfurization, the flue gas becomes saturated, and upon cooling in the chimney, a large amount of moisture condenses. In recent years, power plants in China have commonly removed GGH units, which has led to an increased occurrence of this white smoke phenomenon in chimneys. Countries such as Japan and Germany have requirements regarding the exhaust temperature from chimneys, so white smoke does not occur.
At present, **and local environmental protection authorities have no requirements regarding the \"white dragons.\" In my opinion, eliminating these white dragons merely serves to make the smoke emitted from chimneys look more aesthetically pleasing; some devices install cyclone separators at the top of chimneys. However, I believe that to completely eliminate these white dragons, it is related to the operating temperature inside the desulfurization scrubbers. We see that many thermal power plant chimneys are also emitting huge plumes of white smoke.
The direct cause of droplet formation in the flue gas is the presence of droplets in it that have not been removed by the demister; both the blade spacing of the demister and the flow velocity within the tower affect this. I hope everyone will communicate more
In domestic wet flue gas desulfurization processes that proceed to a subsequent step, the flue gas temperature is too low.
The main reason for white dragons is the relatively high temperature, which leads to significant evaporation of water; this means that a large amount of water is used. There are also some techniques that claim to be able to remove mist, which could be considered a way to save water
Low temperatures, as well as different desulfurization processes used, can also be causes
Most processes nowadays suffer from the white dragon phenomenon, as water is injected into them to lower the temperature of the flue gases, whether it is the alkaline method or the ammonia method
Is it possible to maintain a low operating temperature in the desulfurization tower, and to add a gas-to-gas heat exchanger when exhaust gas is discharged from the tower, or to use a small amount of steam to heat the exhaust gas, thereby reducing the white smoke effect?